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Artykuły w czasopismach na temat "PANI composite"
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a, Busoni, Moch Jonny Putra, Salim Ashar Hanafi, Riza Ummami, Bambang Piluharto i Achmad Sjaifullah. "DOPANT, IMMERSION TIME EFFECT, AND HYDROLYSIS ONTO POLYANILINE/BACTERIAL- COMPOSITES: CONDUCTIVITY STUDIES". International Journal of Advanced Research 10, nr 09 (30.09.2022): 853–62. http://dx.doi.org/10.21474/ijar01/15431.
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The composite of conductive polyaniline was synthesized using the in situ chemical polymerization methods on cellulose to form PANI-cellulose composites. Polyaniline can be composited with a cellulose matrix (nata de coco) due to its abundance, low price, and environmental friendliness. Ammoniumperoxodisulfate (APS) was used as an initiator forthe oxidative polymerization of aniline. Characterization of PANI-Cellulose Bacterial composite was drawn using FT-IR and SEM, while the conductivity and electric quantities both using LCR-meter, FT-IR spectra, and SEM The PANI-cellulose bacterial composite with the various concentration dopant of H2SO4 methods has the highest conductivity than PANI-cellulose bacterial composite with the dopant of HCl methods.
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Zengin, Huseyin, Erdal Bayir i Gulay Zengin. "Solution properties of polyaniline/carbon particle composites". Journal of Polymer Engineering 36, nr 3 (1.04.2016): 299–307. http://dx.doi.org/10.1515/polyeng-2015-0091.
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Abstract This study reports on the synthesis of polymer polyaniline, a conductive polymer by nature, and the preparation of polyaniline/carbon particle (PANI/CP) composites by in situ polymerization. The solution properties and conductivities in solution of synthesized PANI and PANI/CP materials were analyzed. The viscosity of PANI and PANI/CP composite materials in N-methylpyrrolidinone (NMP) solvent at different temperatures was measured to examine their behavior in solution. Initially, the viscosity-molecular weight of PANI polymer was measured and calculated to be 78,521. The viscosities of PANI and PANI/CP composite materials decreased as the temperature increased. However, the viscosities of PANI/CP composite materials increased as the percent CP content in the composites increased. The ionic conductivities and pH changes in NMP solvent, measured at different concentrations of PANI and PANI/CP composite materials, and prepared in different ratios, were measured to investigate their behavior in solution. The ionic conductivities of PANI/CP composite materials increased as the percent CP content in the composites increased. Changes in the pH of PANI/CP composite materials decreased as the percent CP content in the composites increased. The conductivity of PANI/10% CP composite material in solution was greater than that of neat PANI polymer in solution; this indicated that CPs in PANI/10% CP composite materials made important positive contributions to the conductivities.
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Sun, Jun, Xi Yao Teng i Hong Bi. "Preparation of r-GO/Carbon Sphere/PANI Composites with a High Supercapacity". Key Engineering Materials 519 (lipiec 2012): 201–5. http://dx.doi.org/10.4028/www.scientific.net/kem.519.201.
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In this paper, a combination of in-situ polymerization and ultrasonication dispersion method has been successfully utilized to prepare r-GO/carbon sphere/PANI trinary composite. The structural characterizations show that the carbon sphere/PANI composites are wrapped by r-GO sheets in the as-obtained composites. Due to the reinforcing effect coming from r-GO, the efficient charge and ions transport, conductivity, and electrochemical performance of carbon sphere/PANI composite are significantly improved after combining with the r-GO. The r-GO/carbon sphere/PANI composite exhibits the largest specific capacitance of 420 F g-1, about 75% higher than that of carbon sphere/PANI binary composite (240 F g-1). Therefore, such r-GO/carbon sphere/PANI composite can be a potential candidate for high-performance capacitors.
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Seo, Jin Ho, Cheol Soon Choi, Jin Ho Bae, Hanseob Jeong, Seung-Hwan Lee i Yong Sik Kim. "Preparation of a lignin/polyaniline composite and its application in Cr(VI) removal from aqueous solutions". BioResources 14, nr 4 (4.10.2019): 9169–82. http://dx.doi.org/10.15376/biores.14.4.9169-9182.
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Lignin/polyaniline composites were prepared by adding kraft lignin for the synthesis of polyaniline (PANI), a typical conductive polymer. The composites were utilized as an adsorbent for the removal of hexavalent chromium (Cr(VI)). When lignin alone was used as an adsorbent, the removal efficiency of Cr was low. However, when the lignin/PANI composite was used, lignin and PANI adsorbed Cr(III) together. The PANI reduced Cr(VI), which resulted in the efficient removal of Cr. In addition, as the dosage of the lignin/PANI composite decreased as an adsorbent, the Cr removal efficiency of the composite decreased considerably compared with pure PANI. However, the composite with a lignin-to-PANI ratio of 1:1 showed a Cr removal efficiency similar to that of pure PANI. The morphology of the lignin/PANI composite was observed to synthesize PANI around the lignin surface. Both Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses showed that an interaction between the carbonyl groups of lignin and the amine groups of PANI occurred. This study is expected to provide an opportunity to increase the utilization of lignin in the field of environmental science and provide several benefits.
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Pal, Rishi, Sneh Lata Goyal i Anil Kumar Gupta. "Polyaniline/oxide-based core-shell like structured composites for reduction in electromagnetic pollution". International Journal of Innovative Research in Physics 2, nr 4 (5.07.2021): 15–21. http://dx.doi.org/10.15864/ijiip.2403.
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Polyaniline (PANI) based composites with manganese dioxide (MnO2, 30 wt.%) and vanadium pentaoxide (V2O5, 30 wt.%) have been synthesized using the in-situ polymerization synthesis route, whereas both the oxides used as filler materials in the polyaniline matrix. The amalgamated composites have been analyzed for morphological investigation and shielding the incident electromagnetic (EM) waves in the frequency range 8.2-12.4 GHz (X-band). PANI/MnO2 and PANI/V2O5 composites are synthesized in core-shell like morphology, whereas PANI act as core while oxide act as the shell. The shielding of EM waves has been investigated in terms of shielding effectiveness (SE). PANI/MnO2 composite exhibits the efficient SE value i.e. ~50 dB as shown in the figure. This higher value of SE is due to the ferromagnetic character of MnO2 particles which increases the dielectric losses in the specimen. Whereas, PANI/V2O5 composite attain the smaller value of SE i.e. ~9 dB, because V2O5 particles are diamagnetic in nature, thus dielectric losses decrease. Moreover, SE decreases with an increase in frequency due to a decrease in dielectric losses. PANI/MnO2 composite has an SE value greater than the minimum requirement for industrial application i.e. 30 dB, thus, PANI/MnO2 composite can be used as EM shielding material, whereas, PANI/V2O5 composite can’t fulfill this requirement.
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Meng, Na, Xiangqin Wang, Binjie Xin, Zhuoming Chen i Yan Liu. "Preparation, structure and electrochromic behavior of PANI/PVA composite electrospun nanofiber". Textile Research Journal 89, nr 12 (4.09.2018): 2490–99. http://dx.doi.org/10.1177/0040517518797345.
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In this study, the preparation of polyaniline/polyvinyl alcohol (PANI/PVA) emulsion and the fabrication of PANI/PVA nanocomposite and electrochromic device are presented systematically. The surface morphologies, chemical structural and mechanical properties of the PANI/PVA nanofibers were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and instrumental equipment. Four PANI/PVA composites with different PANI concentrations (i.e. 0 wt%, 0.2 wt%, 0.4 wt%, 0.6 wt%) were prepared to investigate the effects of PANI content on the electrochemical properties of the composites. Electrochromic properties of these PANI/PVA electrospun composite nanofibers are systematically characterized by an electrochemical workstation. Cyclic voltammetry was conducted to measure the electrochemical behavior of the PANI/PVA electrospun composite nanofibers at scanning speeds of 5 mV/s, 20 mV/s, 50 mV/s and 100 mV/s; it could be found that the redox peaks almost disappear. The discoloration of PANI/PVA composite electrospun nanofiber presents the color changing among the three mainstream colors of green, yellow, and blue.
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Wang, Xiang-Qin, Bin-Jie Xin i Jian Xu. "Preparation of Conductive PANI/PVA Composites via an Emulsion Route". International Journal of Polymer Science 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/903806.
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A facile and novel strategy for preparing polyaniline/polyvinyl alcohol (PANI/PVA) composite emulsion is reported wherein the reaction is carried out via the emulsion polymerization using ammonium peroxydisulfate (APS) as the oxidizing agent and dodecylbenzene sulfonic acid (DBSA) as the protonic acid. The PANI/PVA composite membranes have been characterized using optical microscope, scanning electron microscope (SEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and electrochemical workstation. It is interesting that the electrical conductivity of the PANI/PVA composites is estimated to be as high as 1.28 S/cm. The experimental results show that the surface of PANI/PVA composite membranes exhibits good integrity. The PANI particles at the nanoscale are dispersed in the PVA matrix, and the electrochromic behaviors of PANI/PVA composites obtained at different polymerization temperatures can be compared based on cyclic voltammetry (CV) curves, revealing that PANI/PVA composites synthesized at room temperature are better than those synthesized at low temperature.
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Wahyuni, Sri, Eko Sri Kunarti, Respati Tri Swasono i Indriana Kartini. "Characterization and Photocatalytic Activity of TiO2(rod)-SiO2-Polyaniline Nanocomposite". Indonesian Journal of Chemistry 18, nr 2 (30.05.2018): 321. http://dx.doi.org/10.22146/ijc.22550.
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A study of TiO2(rod)-SiO2 composites coated with polyaniline (PANI) has been performed. PANI was synthesized through in-situ polymerization of aniline at various concentration (0.0137, 0.0274, and 0.0411 M) on the composite under acidic condition. PANI was confirmed by the appearance of C=N, C=C vibrations and the redshift of the band-gap from 3.14 eV for the TiO2(rod)-SiO2 into 3.0 eV for the TSP01 composite. It is also shown that the polymerization does not change the crystal structure of TiO2(rod)-SiO2 as confirmed by the XRD pattern. The TEM image shows a mixed structure of SiO2 coated by TiO2(rod)-PANI layers and the oxides coated by PANI layers. Therefore, the surface area of the resulted TiO2(rod) and the composites did not change significantly. The T TiO2(rod)-SiO2-PANI composite give small improvement under visible irradiation from 20.25 to 25.59% (around 5% from the bulk of TiO2(rod)) and from 25.03 to 25.59% (around 2% from TiO2(rod)-SiO2 composite). The mixed structure of the composites, as well as the formation of excessive layers of PANI, are possibly the case for the low photoactivity. Further improvement to obtain a core-shell structure with a thin layer of PANI is still sought.
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Tiptipakorn, Sunan, Piriyathorn Suwanmala, Kasinee Hemvichian i Yingpit Pornputtanakul. "Effects of Electron Beam on Irradiated Polyimide/Polyaniline Composites". Advanced Materials Research 550-553 (lipiec 2012): 861–64. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.861.
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In this study, the composites prepared from polyimide (PI) and polyaniline (PANI) were radiated with electron beam (EB) at the radiation doses of 0, 50, 150, 200, and 300 kGy. The electrical conductivity and thermal properties of the radiated composites were determined and compared with those of the composites doped with 6M HCl. The results revealed that the electrical conductivity was enhanced from 3.42 x 10-16 S/cm (untreated polyimide without polyaniline) to 6.97 x 10-5 S/cm when the PI/PANI composite was doped with HCl at 10 phr of PANI; furthermore, the conductivity was increased to 2.16 x 10-4 S/cm for the composite at 10 phr of PANI with radiation dose of 200 kGy. In addition, it was found that the glass transition temperature of the composite was increased with the increase of PANI content for either EB radiation method or protonic acid doping method. It could be noted that the electrical conductivity values of the radiated composites were higher than those of composites doped with HCl at the same PANI content.
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Yuningsih, Lela Mukmilah, i Yusri Mutia Fauziyah. "Sintesis Komposit Polianilin-Karbon Aktif dari Tongkol Jagung sebagai Elektrolit Padat Pada Baterai". Jurnal Kimia VALENSI 4, nr 2 (30.11.2018): 119–23. http://dx.doi.org/10.15408/jkv.v4i2.7390.
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The polyaniline-activated carbon composites are synthesized using aniline chemical oxidation polymerization methods as well as variations in carbonization temperature of 800 °C and 1000 °C. The polyaniline-activated carbon composites are characterized by their value of conductivity, functional groups, crystallinity, morphology, composition and electrical quantities by LCR-meter analysis, FTIR, XRD, SEM-EDX and digital multimeters. The conductivity value of composite polyanilin-activated carbon with carbonization temperature of 800°C and 1000 °C are 0.718 S/cm and 1.1003 S/cm. Polyaniline-activated carbon 800 composite and Polyaniline-activated carbon 1000 composite showed absorption bands acoording to PANI. The wave number that appear on PANI-activated carbon 800 composite and PANI-activated carbon 1000 peak is characteristic of PANI where the wave number 1562 cm-1, 1558 cm-1 is the vibration of the C = N and 1479 cm-1, 1475 cm-1is the vibration of the C = C with slacking off the degree of crystallinity PANI-activated carbon 800 i.e. 23.31% and PANI-activated Carbon 1000 i.e. 37.68%. Analysis of surface morphology and composite element content using SEM-EDX shows that particles of polianilin grows on active carbon fiber and free from impurity. The resulting voltage and current both PANI-Carbon 800 and PANI-carbon 1000 are 1.09 volt 19.74 mA and 1.15 Volts 19.98 mA.
Rozprawy doktorskie na temat "PANI composite"
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Adusei, Paa Kwasi. "Carbon Nanotube-Based Composite Fibers for Supercapacitor Application". University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1561996824580323.
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Biscuola, Marco Aurélio [UNESP]. "Desenvolvimento e caracterização de dispositivos luminescentes híbridos". Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/91884.
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As novas tecnologias para a construção de telas e displays têm permitido reduzir o consumo de energia, o peso e a espessura, como também melhorar a eficiência e flexibilidade se comparado aos antigos monitores de CRTs e até mesmo aos atuais displays de cristal líquido. Dentre estas novas tecnologias destacam-se as que utilizam materiais orgânicos (OLED) ou orgânicos poliméricos (PLED) não somente por suas possibilidades de aplicações industriais, mas também por permitirem o desenvolvimento das ciências básica e aplicada. Seguindo uma linha alternativa, propomos, neste trabalho, um novo compósito híbrido, resultante da combinação de uma fase polimérica e uma fase inorgânica, que, do nosso ponto de vista também poderá contribuir para o desenvolvimento dessa nova geração de displays e telas. Este compósito é formado pela blenda de um polímero condutor dopado, a PANI (polianilina) ou POMA (poli(o-metóxi anilina)), e um polímero isolante, o P(VDF-TrFE) poli(vinilideno-co-trifluoretileno), na qual micro partículas de Zn2SiO4:Mn (SZF) foram adicionadas. Para o desenvolvimento desse novo compósito, estudamos cada um de seus elementos constituintes, notadamente quanto ao seu modo de preparo, características morfológicas e propriedades elétricas. Como resultado final, obtivemos dispositivos constituídos de uma única camada do compósito híbrido depositado por espalhamento sobre um substrato de ITO/FTO, acrescido, ainda, de um eletrodo de alumínio depositado por evaporação. Para a caracterização destes dispositivos foram realizadas medidas de condutividade elétrica, luminescência (L) e fotoluminescência (PL). Os compósitos PANI/P(VDF-TrFE)/SZF 05/95/80 e POMA/P(VDF-TrFE)/SZF 25/75/80 com condutividade elétrica da ordem de 10-3 S/m foram os que melhor se adequaram para a construção dos dispositivos. Os espectros de L e PL apresentaram um pico em ? = 538... .
New technologies recently applied to the fabrication of organic screens and displays have allowed the manufacture of lighter, thinner monitors in comparison to either the conventional cathodic rays tube (CRTs) or the liquid crystal displays (LCDs). In addition, displays based on organic materials (the so-called organic light emitting displays (OLEDs and the polymeric light emitting displays - PLEDs) may exhibit improved efficiency and flexibility. The organic displays have attracted attention of a number of research groups aimed at investigating the potential applications of these new devices in the electronic industry. In this study, a new hybrid composite comprising an inorganic phase dispersed in a polymeric matrix was investigated as a possible candidate material for displays fabrication. The continuous, organic phase was a blend containing a conducting polymer, viz. polyaniline (PANI) or its derivative poly(o-methoxyaniline) (POMA) and an insulating polymer, P(VDF-TrFE) (Poly(viny1idene fluoride- trifluorethylene)). Micro particles of Zn2SiO4:Mn (SZF) was added to the polymeric phase as the luminescent, active material. Luminescent devices were fabricating using a conventional trilayer architecture in which a thin film of the hybrid composite was deposited between two conducting electrodes. As the anode electrode we used either Indium-TinOxide (ITO) or Fluorine-Tin-Oxide (FTO)-covered glass plates. Evaporated aluminum was used as the cathode electrode. The material/device characterization was carried out using electric conductivity, luminescence (L) and photoluminescence (PL) measurements. PANI/P(VDFTrFE)/ SZF (05/95)/80 and POMA/P(VDF-TrFE)/SZF (25/75)/80 composites compositions presented the best performance, with electric conductivity of ca. 10-3 S/m. Luminescence and photoluminescence measurements revealed that both devices exhibited an emission band centered at 538 nm... (Complete abstract, click electronic address below).
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Nguyen, Tuan Anh. "Protection du fer par les polymères conducteurs polyaniline et composite (polyaniline - poly 1,5 - diaminonaphtalène) : électropolymérisation : étude du mécanisme de protection par les mesures électrochimiques locales". Paris 7, 2002. http://www.theses.fr/2002PA077131.
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Brito, Fabiane Fagundes. "Caracterização eletroquimica do composito PSSO3H/PAni para aplicação em celulas a combustivel". [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263645.
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Orientadores: Celia Marina de Alvarenga Freire, Alvaro A. A. de QueirozDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: O desenvolvimento de materiais alternativos para aplicação em células a combustível (CaC) é uma tentativa de viabilização comercial das células, por meio da redução de custos com matéria-prima para manufatura das mesmas. Neste trabalho de mestrado, investigou-se o compósito de poliestireno sulfonado/polianilina para possível aplicação em CaCs, o qual é um material alternativo e de baixo custo de preparo. As propriedades químicas, morfológicas e térmicas do compósito foram caracterizadas por Espectroscopia de Infravermelho, Microscopia Eletrônica de Varredura (MEV) e Microscopia Óptica, Calorimetria Diferencial de Varredura (DSC) e Termogravimetria (TGA), respectivamente. As propriedades eletroquímicas do compósito foram estudadas correlacionando com a estrutura do material, por meio do emprego das seguintes técnicas eletroquímicas: Cronopotenciometria, Voltametria Cíclica e Espectroscopia de Impedância Eletroquímica (EIE). A condutividade iônica do compósito foi determinada pela medida da resistência do material, empregando-se a técnica eletroquímica Galvanodinâmica, com aplicação de uma varredura de corrente
Abstract: The development of alternative materials for fuel cells applications consists on a tentative to produce commercially available fuel cells, by reduction of costs with their manufacturing and materials. This master dissertation presents an investigation on the polystyrene sulfonate/polyaniline composite, which is an alternative material with low cost of production, owing to fuel cells applications. The chemical, morphological and thermal properties were characterized by Infrared Spectroscopy, Scanning Electron Microscopy and Optical Microscopy, Differential Scanning Calorimetry (DSC) and Termogravimetry (TGA), respectively. The electrochemical properties were studied by correlating them with the structure of the material, by employment of the following techiques: Chronopotenciometry, Cyclic Voltammetry and Electrochemical Impedance Spectroscopy (EIS). The ionic conductivity of the composite was determined by the measurement of its resistance, and using a steady-state linear sweep current Galvanodynamic technique
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
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Liang, Jianghong. "Single Wall Carbon Nanotube/Polyacrylonitrile Composite Fiber". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7613.
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Single Wall Carbon Nanotubes (SWNTs), discovered in 1993, have good mechanical, electrical and thermal properties. Polyacrylonitrile (PAN) is an important fiber for textiles as well as a precursor for carbon fibers. PAN has been produced since 1930s.
In this study, we have processed SWNT/PAN fibers by dry-jet wet spinning. Purified SWNT, nitric acid treated SWNTs, and benzonitrile functionalized SWNTs have been used. Fiber processing was done in Dimethyl Formamide (DMF) and coagulation was done in DMF/water mixture. The coagulated fibers were drawn (draw ratio of 6) at 95 oC.
Structure, orientation, and mechanical properties of these fibers have been studied. The cross-sections for all the fibers are not circular. Incorporation of SWNT in PAN results in improved mechanical properties, tensile modulus increased from 7.9 GPa for control PAN to 13.7 GPa for SWNT/PAN composite fiber, and functionalized SWNTs result in higher improvements with tensile modulus reaching 17.8 GPa for acid treated SWNT/PAN composite fibers. The theoretical analysis suggests that observed moduli of the composite fibers are consistent with the predicted values.
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Frost, Brody. "Polymer Composite Spinal Disc Implants". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/78783.
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The goal of this research study was to create an artificial annulus fibrosus similar to that of the natural intervertebral disc, as well as find preliminary results for vertebral endplate connection and nucleus pulposus internal pressure, for the correction of disc degeneration in the spine. The three-part composite samples needed to demonstrate good shock absorption and load distribution while maintaining strength and flexibility, and removing the need for metal in the body, something of which no current total disc replacement or spinal fusion surgery can offer. For this study, the spinal disc was separated into its three different components, the annulus fibrosus, the nucleus pulposus, and the vertebral endplates, each playing a vital role in the function of the disc. Two low-cost materials were selected, a Covestro polyurethane and cellulose nanocrystals, for the purpose of creating a polymer composite spinal disc implant. A methodology was established for creating the cast composite material for use as an annulus fibrosus, while also investigating its mechanical properties. The same composite material was used to acquire preliminary results for vertebral endplate connection to the synthesized annulus, however no additional material was used to determine or mimic the mechanical properties of these endplates, due to time constraints. Also because of time constraints, the nucleus used in this study was only comprised of water with no other additives for preliminary testing since the natural nucleus is comprised of about 80-90% water. These properties were then compared to the mechanical properties of the natural disc, so that they could be finely tuned to emulate the natural disc. It is shown in this study that the composite material, when swelled in water, was able to mimic the annulus fibrosus in tensile strength and modulus, however showed higher compressive strength and modulus than ideal. The samples also did not undergo any permanent deformation within the realm of force actually introduced to the natural disc. The vertebral endplates showed decent adhesion to the synthesized annulus, however there were slight defects that became failure concentrators during compression testing. The nucleus showed promising results maintaining good internal pressure to the system causing better compressive load distribution, with barreling of the samples.Master of Science
Spinal disc degeneration is a very prevalent problem in today’s society, effecting anywhere from 12% to 35% of a given population. It usually occurs in the lumbar section of the spine, and when severe enough, can cause bulging and herniation of the intervertebral disc itself. This can cause immense lower back pain in individual’s stricken with this disease, and in the US, medical costs associated with lower back pain to exceed $100 billion. Current solutions to this problem include multiple different treatment options of which, spinal fusion surgery and total disc replacement (TDR) are among the most common. Although these treatments cause pain relief for the majority of patients, there are multiple challenges that come with these options. For example, spinal fusion surgery severely limits the mobility of its patients by fusing two vertebrae together, disallowing any individual movement, and TDR can cause hypermobility in among the vertebrae and offer little to no shock absorption of loads. Therefore, a better treatment option is needed to relieve the pain of the patients, as well as maintain equal motion, shock absorption, and load cushioning to that of the normal intervertebral disc and remaining biocompatible. The goal of this research study was to create a three-component system, like that of the natural intervertebral disc, for the use of spinal disc replacement and to replace current options. The fabricated system was comprised of the three components found in the natural intervertebral disc; the annulus fibrosus, the nucleus pulposus, and the vertebral endplates. Because the system will need to go in-body, the materials used were all characterized as biocompatible materials; the polyurethane currently being used in medical devices and implants, and the cellulose nanocrystals (CNCs) coming from natural cellulose in sources such as wood and plants. The results determined that the mechanical properties of the system can be fine-tuned in order to mimic the natural strength and cushioning capabilities of the natural disc, based on CNC content added to the polyurethane, and when all three components of the system are added together, the compressive stress-strain is most similar to the natural disc in compression. However, the system did show failure in the connection between the annulus fibrosus and vertebral endplates, causing herniation of the nucleus similar to the initial problem attempting to be solved. For this, more ideal fabrication methods should be researched in the future including 3D printing techniques, injection molding, and roll milling. As well as alternate fabrication techniques, cell grow and viability should be determined to show that cells don’t die once the system in implanted.
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Frost, Brody A. "Polymer Composite Spinal Disc Implants". Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78783.
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The goal of this research study was to create an artificial annulus fibrosus similar to that of the natural intervertebral disc, as well as find preliminary results for vertebral endplate connection and nucleus pulposus internal pressure, for the correction of disc degeneration in the spine. The three-part composite samples needed to demonstrate good shock absorption and load distribution while maintaining strength and flexibility, and removing the need for metal in the body, something of which no current total disc replacement or spinal fusion surgery can offer. For this study, the spinal disc was separated into its three different components, the annulus fibrosus, the nucleus pulposus, and the vertebral endplates, each playing a vital role in the function of the disc. Two low-cost materials were selected, a Covestro polyurethane and cellulose nanocrystals, for the purpose of creating a polymer composite spinal disc implant. A methodology was established for creating the cast composite material for use as an annulus fibrosus, while also investigating its mechanical properties. The same composite material was used to acquire preliminary results for vertebral endplate connection to the synthesized annulus, however no additional material was used to determine or mimic the mechanical properties of these endplates, due to time constraints. Also because of time constraints, the nucleus used in this study was only comprised of water with no other additives for preliminary testing since the natural nucleus is comprised of about 80-90% water. These properties were then compared to the mechanical properties of the natural disc, so that they could be finely tuned to emulate the natural disc. It is shown in this study that the composite material, when swelled in water, was able to mimic the annulus fibrosus in tensile strength and modulus, however showed higher compressive strength and modulus than ideal. The samples also did not undergo any permanent deformation within the realm of force actually introduced to the natural disc. The vertebral endplates showed decent adhesion to the synthesized annulus, however there were slight defects that became failure concentrators during compression testing. The nucleus showed promising results maintaining good internal pressure to the system causing better compressive load distribution, with barreling of the samples.Master of Science
Spinal disc degeneration is a very prevalent problem in today’s society, effecting anywhere from 12% to 35% of a given population. It usually occurs in the lumbar section of the spine, and when severe enough, can cause bulging and herniation of the intervertebral disc itself. This can cause immense lower back pain in individual’s stricken with this disease, and in the US, medical costs associated with lower back pain to exceed $100 billion. Current solutions to this problem include multiple different treatment options of which, spinal fusion surgery and total disc replacement (TDR) are among the most common. Although these treatments cause pain relief for the majority of patients, there are multiple challenges that come with these options. For example, spinal fusion surgery severely limits the mobility of its patients by fusing two vertebrae together, disallowing any individual movement, and TDR can cause hypermobility in among the vertebrae and offer little to no shock absorption of loads. Therefore, a better treatment option is needed to relieve the pain of the patients, as well as maintain equal motion, shock absorption, and load cushioning to that of the normal intervertebral disc and remaining biocompatible. The goal of this research study was to create a three-component system, like that of the natural intervertebral disc, for the use of spinal disc replacement and to replace current options. The fabricated system was comprised of the three components found in the natural intervertebral disc; the annulus fibrosus, the nucleus pulposus, and the vertebral endplates. Because the system will need to go in-body, the materials used were all characterized as biocompatible materials; the polyurethane currently being used in medical devices and implants, and the cellulose nanocrystals (CNCs) coming from natural cellulose in sources such as wood and plants. The results determined that the mechanical properties of the system can be fine-tuned in order to mimic the natural strength and cushioning capabilities of the natural disc, based on CNC content added to the polyurethane, and when all three components of the system are added together, the compressive stress-strain is most similar to the natural disc in compression. However, the system did show failure in the connection between the annulus fibrosus and vertebral endplates, causing herniation of the nucleus similar to the initial problem attempting to be solved. For this, more ideal fabrication methods should be researched in the future including 3D printing techniques, injection molding, and roll milling. As well as alternate fabrication techniques, cell grow and viability should be determined to show that cells don’t die once the system in implanted.
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Marcasuzaa, Pierre. "Composites conducteurs à base de PANI : vers une architecture contrôlée de 2D à 3D". Pau, 2009. http://www.theses.fr/2009PAUU3047.
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Les polymères intrinsèquement conducteurs (PIC) sont une catégorie de matériaux qui connaissent actuellement un important essor. Cependant, leur principal inconvénient est leur insolubilité dans les solvants usuels. C’est pour cela que de nombreuses études les associent avec des matrices polymère pour former des composites. Lors de cette étude, nous avons synthétisé des copolymères à blocs conducteurs dont la structure chimique est contrôlée. Ces copolymères sont composés d’un bloc "matrice" et d’un second bloc conducteur. La première partie, polystyrène ou polyacrylate, est synthétisée par polymérisation radicalaire contrôlée (ATRP) afin de maîtriser les masses molaires (entre 5 000 et 15 000 g/mol) et la polymolécularité (Ip). La partie conductrice est un oligomère d’aniline. Puis, les deux blocs sont couplés pour former un copolymère dibloc. Cette synthèse est réalisée par voie conventionnelle (chauffage bain d’huile) et sous irradiation micro-onde. Une autre architecture de copolymère est réalisée, il s’agit du greffage de polyaniline sur un polymère naturel, le chitosane. En effet, celui-ci apporte des propriétés filmogène, mais également la possibilité de réaliser des hydrogels par réticulation du copolymère greffé. Ainsi un réseau dans lequel la PANI est répartie de façon homogène est obtenuIntrinsically conducting polymers (ICPs) are a recent category of materials which currently make strong great strides. However, their main inconvenience is their insolubility in the usual solvents. That’s why lots of studies associate them with polymer matrices to make composites. During this study, conductive blocks copolymers with controlled architecture were obtained. These copolymers consist of a "matrix" block and a second conductive block. The first part, polystyrene or polyacrylate, is synthesized by controlled radical polymerization (ATRP) to control the molecular weight (between 5 000 and 15 000 g / mol) and the polydispersity (Ip). The conductive part is an oligomer of aniline. Then, both blocks are coupled to obtain a diblock copolymer. This synthesis is realized by conventional heating (bath of oil) and under microwave irradiation. Other architecture of copolymer is realized, it consists on the graft of polyaniline onto a natural polymer, the chitosane which brings coating properties, and the possibility of realizing hydrogels by crosslinking of grafting copolymer. So a network in which the PANI is distributed in a homogeneously is obtained
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Antoine, Donley. "Optical Transparent Pmma Composite Reinforced By Coaxial Electrospun Pan Hollow Nanofibers". Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc271772/.
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Electrospinning has been recognized as an efficient technique for the fabrication of polymer fibers. These electrospun fibers have many applications across a broad range of industries. In this research, optical transparent composites were successfully fabricated by embedding polyacrylonitrile (PAN) hollow nanofibers into poly (methyl methacrylate) (PMMA) matrix. The hollow PAN nanofibers were prepared by coaxial electrospinning. The PAN was used as the shell solution, and the mineral oil was used as the core solution. The resulting fibers were then etched with octane to remove the mineral oil from the core. The hollow PAN fibers were then homogeneously distributed in PMMA resins to fabricate the composite. The morphology, transmittance and mechanical properties of the PAN/PMMA composite were then characterized with an ESEM, TEM, tensile testing machine, UV-vis spectrometer and KD2 Pro Decagon device. The results indicated that the hollow nanofibers have relatively uniform size with one-dimensional texture at the walls. The embedded PAN hollow nanofibers significantly enhanced the tensile stress and the Young's modulus of the composite (increased by 58.3% and 50.4%, respectively), while having little influence on the light transmittance of the composite. The KD2 Pro device indicated that the thermal conductivity of the PMMA was marginally greater than the PAN/PMMA composite by 2%. This novel transparent composite could be used for transparent armor protection, window panes in vehicles and buildings, and airplane windshield etc.
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Fröhlich, Christine, Frank Jacobi i Hans-Ulrich Wittchen. "DSM-IV pain disorder in the general population". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-105073.
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Background: Despite an abundance of questionnaire data, the prevalence of clinically significant and medically unexplained pain syndromes in the general population has rarely been examined with a rigid personal-interview methodology. Objective To examine the prevalence of pain syndromes and DSM-IV pain disorder in the general population and the association with other mental disorders, as well as effects on disability and health-care utilization.
Methods: Analyses were based on a community sample of 4.181 participants 18–65 years old; diagnostic variables were assessed with a standardized diagnostic interview (M-CIDI).
Results: The 12-month prevalence for DSM-IV pain disorder in the general population was 8.1%; more than 53% showed concurrent anxiety and mood disorders. Subjects with pain disorder revealed significantly poorer quality of life, greater disability, and higher health-care utilization rates compared to cases with pain below the diagnostic threshold. The majority had more than one type of pain, with excessive headache being the most frequent type.
Conclusions: Even when stringent diagnostic criteria are used, pain disorder ranks among the most prevalent conditions in the community. The joint effects of high prevalence in all age groups, substantial disability, and increased health services utilization result in a substantial total burden, exceeding that of depression and anxiety.
Książki na temat "PANI composite"
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Wayne, Matt. Panic of the composite creatures. Mankato, Minn: Capstone Stone Arch Books, 2012.
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Panigrahi, Muktikanta, i Arpan Kumar Nayak. Polyaniline based Composite for Gas Sensors. IOR PRESS, 2021. http://dx.doi.org/10.34256/ioriip212.
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In this research work, we have demonstrated the synthesis, spectroscopic characteristics, thermal behaviour and DC conductivity of a few nanostructured composites, substituted conducting polymers (ICPs) and composites of ICPs. The physical properties of aforementioned composites are significantly changed by the doping with HCl, H2SO4, HNO3, H3PO4, or acrylic acid. The charge transport properties of these polymeric materials have been studied in detail because of their potential application in gas sensors. In the current work, varieties of conducting polymer based materials such as PANI-ES/Cloisite 20A nanostructured composite, acrylic acid (AA) doped PANI polymer, N-substituted conducting polyaniline polymer, DL−PLA/PANI-ES composites, poly methyl methacrylate (PMMA) based polyaniline composite, and inorganic acid doped polyaniline are sucessfuly synthesized using aniline/aniline hydrochloride as precursors in acidic medium. Particularly, AA based synthesised PANI polymer was found with higher solubility The spectroscopic, thermal stability, enthalpy of fusion, room temperature DC conductivity and temperature dependent DC conductivity measurements with and without magnetic was carried out with as-synthesized materials. The FTR/ATR−FTIR spectra indicated the presence of different functional groups in the as-prepared composite materials. The UV−Visible absorption spectroscopic analysis showed the presence of polaron band suggesting PANI-ES form. The Room temperature DC conductivity, temperature variation DC conductivity (in presence and absence of magnetic field), and magnetoresistance (MR) of as-prepared conducting polyaniline based were analysed. The highest room temperature DC conductivity value was obtained from H2SO4 doped based composite materials and all prepared conductive composites were followed ohms law. The low temperature DC conductivity was carried out in order to study the semiconducting nature of prepared materials. The Mott type VRH model was found to be well fitted the conductivity data and described the density of states at the Fermi level which is constant in this temperature range. From MR plots, a negative MR was observed, which described the quantum interference effect on hopping conduction. We discuss different gas analytes i.e., NO2, LPG, H2, NH3, CH4, and CO of conducting polymer based materials.
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Araújo, Ana Cláudia Vaz de. Síntese de nanopartículas de óxido de ferro e nanocompósitos com polianilina. Brazil Publishing, 2021. http://dx.doi.org/10.31012/978-65-5861-120-2.
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In this work magnetic Fe3O4 nanoparticles were synthesized through the precipitation method from an aqueous ferrous sulfate solution under ultrasound. A 23 factorial design in duplicate was carried out to determine the best synthesis conditions and to obtain the smallest crystallite sizes. Selected conditions were ultrasound frequency of 593 kHz for 40 min in 1.0 mol L-1 NaOH medium. Average crystallite sizes were of the order of 25 nm. The phase obtained was identified by X-ray diffractometry (XRD) as magnetite. Scanning electron microscopy (SEM) showed polydisperse particles with dimensions around 57 nm, while transmission electron microscopy (TEM) revealed average particle diameters around 29 nm, in the same order of magnitude of the crystallite size determined with Scherrer’s equation. These magnetic nanoparticles were used to obtain nanocomposites with polyaniline (PAni). The material was prepared under exposure to ultraviolet light (UV) or under heating, from dispersions of the nanoparticles in an acidic solution of aniline. Unlike other synthetic routes reported elsewhere, this new route does not utilize any additional oxidizing agent. XRD analysis showed the appearance of a second crystalline phase in all the PAni-Fe3O4 composites, which was indexed as goethite. Furthermore, the crystallite size decreases nearly 50 % with the increase in the synthesis time. This size decrease suggests that the nanoparticles are consumed during the synthesis. Thermogravimetric analysis showed that the amount of polyaniline increases with synthesis time. The nanocomposite electric conductivity was around 10-5 S cm-1, nearly one order of magnitude higher than for pure magnetite. Conductivity varied with the amount of PAni in the system, suggesting that the electric properties of the nanocomposites can be tuned according to their composition. Under an external magnetic field the nanocomposites showed hysteresis behavior at room temperature, characteristic of ferromagnetic materials. Saturation magnetization (MS) for pure magnetite was ~ 74 emu g-1. For the PAni-Fe3O4 nanocomposites, MS ranged from ~ 2 to 70 emu g-1, depending on the synthesis conditions. This suggests that composition can also be used to control the magnetic properties of the material.
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Hintz, Lisel. National Identities in Turkey. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190655976.003.0003.
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This chapter presents the empirical data collected and analyzed through intertextual analysis to extract competing proposals for Turkish national identity among the country’s population. The analysis includes examination of social and news media sources, interviews, surveys, and archives. The empirical data are also collected from popular culture sources such as novels, television shows, and films to capture vernacular discourse otherwise inaccessible to the researcher. The chapter employs a framework of identity content to parse out the constitutive norms, social purposes, relational meanings, and cognitive worldviews of citizens of Turkey. The four composite proposals that emerge are Republican Nationalism, Pan-Turkic Nationalism, Ottoman Islamism, and Western Liberalism. This process of identity extraction through intertextual analysis lays the groundwork for examining the red lines, or points of intolerability, across competing proposals for Turkey’s national identity.
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Fields, Keota. Berkeley’s Semiotic Idealism. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198755685.003.0005.
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This chapter proposes an interpretation of Berkeley as a semiotic idealist. According to semiotic idealism internal ideas are signs for external divine ideas, and sensible objects are composite entities with external divine ideas as their essential parts and internal ideas of the imagination and (where applicable) sensations as their contingent parts. Signification is the ontological glue that unifies these parts into individuals. Divinely instituted normative linguistic rules govern the use of internal ideas as signs for external divine ideas. This semiotic relation gives objective form and meaning to internal ideas. Furthermore, Berkeley explicitly links this semiotic relation with rewards and sanctions, and claims that such connections allow us to make predictions about advantageous and disadvantageous courses of action. Sensible objects turn out to be values (rather than facts) because they are sources of pleasure and pain, guides to human flourishing, and sources of external meaning for Berkeley.
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Narang, Gopi Chand. The Urdu Ghazal. Tłumacz Surinder Deol. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190120795.001.0001.
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The Urdu ghazal is a marvel of the magnetic dynamism of husn o i’shq filled with innovative imagery. It is a celebration of life and love in an ambiance of pure ecstasy. It has a profound capacity for joy as well as pain. It is the soul of Urdu verse and the play of creativity at its peak. No other poetic genre is as innately musical as the ghazal. The book presents unique flowering of the Urdu ghazal as a by-product of India’s composite culture that evolved from intermixing of Indian and foreign value systems. This never-before narrated story of the evolution of the Urdu ghazal is documented in eight chapters divided into three parts. It explores a variety of influences, including Sufism, Bhakti movement, and infusion of Rekhta and Persian languages and culture. The book explains classical ghazal forms that blossomed from the seeds sown by Amir Khusrau in the fourteenth century to great heights of literary excellence achieved during the next 300, notably in the works of great poets like Mir and Ghalib. Different socio-political and cultural demands of changing times are expounded towards the end, primarily how the ghazal provided new creative models to deal with literary movements like progressivism, modernism, and postmodernism. This book includes samples of works of thematically related poets. It also covers works of twentieth-century pioneering innovators like Firaq Gorakhpuri and Faiz Ahmed Faiz, and postmoderns like Gulzar and Javed Akhtar.
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Palamarchuk, Anastasia, Ekaterina Terenteva i Sergey Fyodorov. The Birth of the National Historical Writing in England and France. St. Petersburg State University, 2021. http://dx.doi.org/10.21638/11701/9785288061646.
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The monograph is a study of main trends of emergence and evolution of the national historical writing in Western Europe in the XVIIth century. Based on a complex analysis of several phenomena which defined the development of the Early Modern historical writing, it provides a comparative analysis of the regional schools of historical writing (particularly those of the English antiquaries and French érudits) in the process of their respective growth and formation accomplished by the end of XVIIth century with the advent of the national historiography. The conceptual unity of the book is verified within the context of the rise of the national states in England and France, which stipulated a consistent demand for reinforcing the nationally orientated discourses not only in a historical writing but also in legal and political thought. The perception of England as an empire, entrenched in the insular historical and legal consciousness, recurring during the reigns of the Stuarts and extending to the whole British archipelago, determined the establishment of chorography as a prevalent form characteristic of the English historiography. Chorographic structure of the narrative unfolding the space of the territorial “empire” to the reader corresponded to the method of “intellectual appropriation” of the British Isles by the English antiquarians which could be defined as “cultural-historical”. A considerable role was devoted to reactualization of ethnogenetic myths at different levels: while some of them (primarily – the Galfridian myth) were regarded as relevant to the pan-British cultural and historical past, others emphasized autonomous dimensions of the past and present of distinct composites (Scotland, Ireland, Wales) The continental French variant of proto-national historiography also utilized the idea of empire but in a different mode defined by the formula “rex in regno suo imperator est”. The emerging school of érudits modelled principles of its narratives on patrimonial structures rooted in the feudal medieval society (dynasty; royal family; aristocratic lineages; seigneurial rights and vassal obligations; the system of offices created by the monarch stemming from the royal household etc.). The unity of the subjects of the French kingdom was ensured not by the shared territorial commonality but by their loyalty to the king. Therefore, the French variant of “intellectual appropriation” was developed in a socio-political direction in contrast to the territorial.
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Moore, Carey A. Judith. Yale University Press, 1985. http://dx.doi.org/10.5040/9780300261790.
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Judith is Volume 40 in the acclaimed anchor Bible series of new book-by-book translations of the Old and New Testaments and Apocrypha. In the Apocrypha, Judith is the saint who murdered for her people. She offered herself to Holofernes, the Assyrian general sent by Nebuchadnezzar to destroy the Israelites. After she had charmed Holofernes with flattery and drink, Judith chopped of his head while he lay in a drunken stupor, thereby leaving his troops “headless” and in a state of total panic and confusion. Her victory was celebrated in song and brought peace to her land for years to come. In his illuminating new translation and commentary, Carey A. Moore considers the historicity of the story and explores the author’s true intent: Was it to describe actual events or to compose a fictitious story of other purposes? Was his concern more historical or theological? The story of Judith abounds in ironies. There is Judith, the beautiful woman who lived a stark, celibate existence after her husband’s death had left her a wealthy widow. Born into a sexist society with rigidly defined roles, Judith better “played the man” than did any of her male compatriots. There is Holofernes, the Assyrian conqueror, unable to defeat a small Israelite village after dozens of countries had fallen under his sword. Intent on seducing Judith, Holofernes instead lost his head to her. Perhaps the ultimate irony of all is the story of Judith itself: the timeless tale of a deeply religious woman who became revered not for her poverty but for an act of murder. Dr. Moore’s study of the canonicity of Judith brings perspective to the story’s varied acceptance among both Jews and Christians. It also notes the similarity between this work and the equally popular story of Esther; each woman, through different means, served her people through acts of bravery. The photographs and maps illustrating Judith include depictions of the story of Judith by such masters as Machiavelli, Botticelli, Caravaggio, and Donatello.
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Moore, Carey A. Judith. Yale University Press, 1985. http://dx.doi.org/10.5040/9780300261790.
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Judith is Volume 40 in the acclaimed anchor Bible series of new book-by-book translations of the Old and New Testaments and Apocrypha. In the Apocrypha, Judith is the saint who murdered for her people. She offered herself to Holofernes, the Assyrian general sent by Nebuchadnezzar to destroy the Israelites. After she had charmed Holofernes with flattery and drink, Judith chopped of his head while he lay in a drunken stupor, thereby leaving his troops “headless” and in a state of total panic and confusion. Her victory was celebrated in song and brought peace to her land for years to come. In his illuminating new translation and commentary, Carey A. Moore considers the historicity of the story and explores the author’s true intent: Was it to describe actual events or to compose a fictitious story of other purposes? Was his concern more historical or theological? The story of Judith abounds in ironies. There is Judith, the beautiful woman who lived a stark, celibate existence after her husband’s death had left her a wealthy widow. Born into a sexist society with rigidly defined roles, Judith better “played the man” than did any of her male compatriots. There is Holofernes, the Assyrian conqueror, unable to defeat a small Israelite village after dozens of countries had fallen under his sword. Intent on seducing Judith, Holofernes instead lost his head to her. Perhaps the ultimate irony of all is the story of Judith itself: the timeless tale of a deeply religious woman who became revered not for her poverty but for an act of murder. Dr. Moore’s study of the canonicity of Judith brings perspective to the story’s varied acceptance among both Jews and Christians. It also notes the similarity between this work and the equally popular story of Esther; each woman, through different means, served her people through acts of bravery. The photographs and maps illustrating Judith include depictions of the story of Judith by such masters as Machiavelli, Botticelli, Caravaggio, and Donatello.
Części książek na temat "PANI composite"
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Srivastava, Divyanshi, i R. K. Shukla. "Dielectric Properties of PAni/ZnO Composite". W Springer Proceedings in Physics, 323–27. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0202-6_24.
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Zahornyi, M. M., O. M. Lavrynenko, O. Yu Pavlenko, M. E. Bondarenko, P. M. Silenko, Yu M. Solonin, O. Y. Khyzhun, T. F. Lobunets i A. K. Melnyk. "Nanostructured Optical Composites of TiO2(C3N4Ox)/PANI for Photocatalytic Application". W Springer Proceedings in Physics, 369–83. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18104-7_26.
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Filardo, Giuseppe, Elizaveta Kon, Marco Delcogliano, Giovanni Giordano, Tommaso Bonanzinga, Maurilio Marcacci i Stefano Zaffagnini. "Novel Nano-composite Multilayered Biomaterial for the Treatment of Patellofemoral Cartilage Lesions". W Patellofemoral Pain, Instability, and Arthritis, 255–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-05424-2_32.
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Sonwane, Nayana D., Sanchit S. Kondawar, Pitambar V. Gayakwad i Subhash B. Kondawar. "Application of Electrospun Polyaniline (PANI) Based Composites Nanofibers for Sensing and Detection". W Electrospun Nanofibers, 491–517. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99958-2_18.
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Lafferty, Anita, i Julie A. Mooney. "Co-Composing Poetic and Arts-Based Narratives". W Counternarratives of Pain and Suffering as Critical Pedagogy, 71–90. New York: Routledge, 2022. http://dx.doi.org/10.4324/9781003205296-7.
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Ramazani, Ali, Nasser Arsalani, Vahid Shirazi Khanamiri, Amin Goljanian Tabrizi i Mahsa Sadat Safavi. "Development and Characterization of a Graphene Nanosheet-Polyaniline (GNS-PANI) Nanocomposite for Conductive Ink Applications". W Processing and Properties of Advanced Ceramics and Composites VII, 361–68. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119183860.ch34.
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Nascimento, Lucio Fabio Cassiano, Luis Henrique Leme Louro, Sérgio Neves Monteiro, Alaelson Vieira Gomes, Édio Pereira Lima Júnior i Rubens Lincoln Santana Blazutti Marçal. "Ballistic Performance in Multilayer Armor with Epoxy Composite Reinforced with Malva Fibers". W Proceedings of the 3rd Pan American Materials Congress, 331–38. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52132-9_33.
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Liu, Fei, Yong Jun He i Jeung Soo Huh. "Study on the Synthesis and Characterization of PANi/Nano-CeO2 Composites". W Solid State Phenomena, 287–90. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-31-0.287.
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Vázquez, Lucio, Dulce Y. Medina, Ángel D. Villarreal, David A. López, Gilberto Rangel, Elizabeth Garfias i Manuel Vite. "Advantages of Hot Compression in the Manufacture of Al-B4C Composites". W Proceedings of the 3rd Pan American Materials Congress, 307–15. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52132-9_30.
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Pereira, Artur C., Sergio N. Monteiro, Foluke S. Assis i Henry A. Colorado. "Izod Impact Tests in Polyester Matrix Composites Reinforced with Fique Fabric". W Proceedings of the 3rd Pan American Materials Congress, 365–72. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52132-9_37.
Pełny tekst źródłaStreszczenia konferencji na temat "PANI composite"
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Polpaya, Indu Chanchal, C. Lakshmana Rao i Susy Varughese. "Electromechanical Behavior and Microstructure of Highly Sensitive Polyaniline/Ethylene Vinyl Acetate Composite Piezo-Resistive Materials". W ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9163.
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The unique micro/nano-structure of an intrinsically conducting polymer can be tuned to get higher gauge factors (GF) and reliability, which make them better materials for piezo-resistive applications than conducting carbon based composites and metallic composites. This work reports a highly sensitive conducting polyaniline (PANI)-based composite film that showed a GF ∼66. This high GF was achieved by forming a particular microstructure of conducting PANI particles in a free standing film of PANI-DBSA/EVA. The paper also attempts to explain the mechanism for the observed high sensitivity using the electronic percolation theory, shape and size of the conducting particles and the changes in the microstructure, due to strain. The high sensitivity, high stability during cyclic loading and low electrical hysteresis together with high mechanical strength make PANI-DBSA/EVA conducting composite film a promising material for piezo-resistive strain sensing applications.
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Masemola, Clinton Michael, Ndhivuwo Prince Shumbula, Siziwe Sylvia Gqoba, Zikhona Nobuntu Tetana, Nosipho Moloto i Ella Cebisa Linganiso. "Electrospun NGQDs/PANI/PAN Composite Fibers for Room Temperature Alcohol Sensing". W 2021 IEEE 3rd Eurasia Conference on IOT, Communication and Engineering (ECICE). IEEE, 2021. http://dx.doi.org/10.1109/ecice52819.2021.9645665.
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Mannayil, Jasna, Manoj M, Sankaran Jayalekshmi i M. K. Jayaraj. "PANI/MWCNT composite electrode for supercapacitor applications". W Low-Dimensional Materials and Devices 2018, redaktorzy Nobuhiko P. Kobayashi, A. Alec Talin, Albert V. Davydov i M. Saif Islam. SPIE, 2018. http://dx.doi.org/10.1117/12.2320545.
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Lee, Ka Yeung Terence, Hani Naguib i Keryn Lian. "Flexible Multiwall Carbon Nano-Tubes/Polyaniline Composite for Supercapacitor Application". W ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3293.
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In this study, the electrochemical performance of Multi-walled Carbon nanotubes (MWCNT) and polyaniline (PANI) composite (PANI/MWCNT) as supercapacitor electrode material was investigated. An improvement in capacitive performance due to the combination of pseudo capacitance and double layer capacitance was observed. A nano-composite was fabricated by polymerizing pseudo-capacitive polyaniline onto the MWCNT surface through the in-situ chemical polymerization approach. Ammonium persulphate (APS) was used as oxidant to polymerize PANI and HCl was used as dopant. Stainless steel thin foil was used as a current collector as well as a flexible back bone. Graphite conductive ink as binder was used to form a conductive paste. Different composition is varied by varying the PANI concentration from 0.1M, 0.3M, and 0.5M to 1M molar concentration. For material characterization, Scanning Electron Microscopy (SEM) was used to characterize surface morphology of the composite. Cyclic Voltammetry and Electrochemical Impedance Spectrometry in three electrodes set up found that 0.1M PANI/MWCNT yields the best electrochemical performance. Two electrodes setup evaluation on 0.1M PANI/MWCNT reviews promising characteristic suitable for device application. The improved electroactivity of the PANI/MWCNT composite is discussed in detail.
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Parangusan, Hemalatha, Jolly Bhadra, Razen Al-Qudah, Hibballa Elgurashi, Marwa Abdelhakem i Ebtihal Mohaned. "Liquid exfoliated MoS2 Sheet coupled with Conductive Polyaniline for Gas Sensor". W Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0012.
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Polyaniline (PANI)/MoS2 composites with porous microspheres were prepared by a hydrothermal and in situ polymerization method. The structural, optical, and morphological properties were characterized by X-ray powder diffraction, FTIR, scanning electron microscope, transmission electron microscope. The XRD results confirmed that the PANI/MoS2 composite was formed. Morphological characterization reveals that the successful formation of few to multilayered MoS2 nanosheet intercalated with the PANI nanoparticles.
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Roy, Atanu, Apurba Ray, Priyabrata Sadhukhan i Sachindranath Das. "Transparent CNT/PANI composite electrode for supercapacitive applications". W Proceedings of the International Conference on Nanotechnology for Better Living. Singapore: Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-09-7519-7nbl16-rps-144.
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Mezdour, Douniazad, Mohamed Tabellout, Jean Francois Bardeau i Salah Sahli. "Dielectric and electrical properties of PANI composite films". W 2014 North African Workshop on Dielectric Materials for Photovoltaic Systems (NAWDMPV). IEEE, 2014. http://dx.doi.org/10.1109/nawdmpv.2014.6997612.
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Bhadra, Jolly, Hemalatha Parangusan, Zubair Ahmad, Shoaib Mallick, Farid Touati i Noora Jabor Al-Thani. "Capacitive type Humidity Sensor based on PANI decorated Cu-Zns Porous Micropshere". W Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0016.
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PANI coated Cu-ZnS porous microsphere structures have been synthesized by hydrothermal method and in-situ polymerization process. The synthesized composite is characterized by different techniques in order to study the structural, morphological and surface absorption properties. The experimental observation demonstrates that the PANI/1%Cu-ZnS composite has better sensitivity, fast response and good stability as compared to pure PANI and other PANI/CuZnS compositions. Finally, PANI/1% Cu-ZnS composite has been found to be optimized for the humidity sensors due to its well-distributed roughness, porosity and hydrophilicity. The average response and recovery times of the PANI/1% Cu-ZnS are found to be 42 s and 24 s, respectively, which outperform recent results.
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Zhang, Yong. "Preparation and Characterization of PANI/TiO2 Nano-composite Fibers". W 2015 2nd International Workshop on Materials Engineering and Computer Sciences. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/iwmecs-15.2015.50.
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MANOMAISANTIPHAP, SIWAT, i TOMOHIRO YOKOZEK YOKOZEKI. "EFFECTS OF NUMBER OF PLIES ON LIGHTNING STRIKE PROTECTION OF ELECTRICALLY CONDUCTIVE LAYER-WISE HYBRID LAMINATES". W Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35908.
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With the development of composite technologies, aircraft become lighter and more fuel efficiency. The composite aircraft, however, become susceptible to lightning strike. Developing lightning strike protection (LSP) system need to couple with composite technologies. The authors present a concept of LSP using layer-wise hybrid laminates (CF/Hybrid) in this study. The aim of the study is to validate the effectiveness of layer-wise hybrid laminates structure for lightning strike application by using conventional epoxy-resin CFRP for main structure and electrically conductive layer as a cover layer. The composite laminates include two different types of resin in each layer: conductive polyaniline-based matrix (CF/PANI) and conventional epoxy resin (CF/epoxy). CF/PANI layers varied from 1, 2, and 4 layers with corresponding 7, 6, and 4 layers of CF/epoxy to find out the least effective number of CF/PANI that can prevent lightning strike damage. The specimens were characterized for their mechanical properties and underwent simulated lightning strike test to realize their effectiveness. The result of simulated lightning strike has shown that a layer of conductive CF/PANI can help to avoid catastrophic damage on CF/epoxy. With a greater number of CF/PANI, the less detectable damage in CF/PANI layer became. In the case of CF/Hybrid with 4 layers of CF/PANI shows 70% residual bending strength after the lightning strike. With the aid of nondestructive inspection tools, i.e., thermography and ultrasonic test, the mechanism of damage on the composite panels were observed and analyzed. From this study, CF/Hybrid with 4 layers shows the optimal properties for lightning strike protection.
Raporty organizacyjne na temat "PANI composite"
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Michel Jr., Frederick C., Harry A. J. Hoitink, Yitzhak Hadar i Dror Minz. Microbial Communities Active in Soil-Induced Systemic Plant Disease Resistance. United States Department of Agriculture, styczeń 2005. http://dx.doi.org/10.32747/2005.7586476.bard.
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Induced Systemic Resistance (ISR) is a highly variable property that can be induced by compost amendment of potting media and soils. For example, previous studies showed that only 1 of 79 potting mixes prepared with different batches of mature composts produced from several different types of solid wastes were able to suppress the severity of bacterial leaf spot of radish caused by Xanthomonas campestris pv. armoraciae compared with disease on plants produced in a nonamended sphagnum peat mix. In this project, microbial consortia in the rhizosphere of plants grown in ISR-active compost-amended substrates were characterized. The plants used included primarily cucumber but also tomato and radish. Rhizosphere microbial consortia were characterized using multiple molecular tools including DGGE (Israel) and T -RFLP (Ohio) in both ISR-active field plots and potting media. Universal as well as population-specific bacterial and fungal PCR primers were utilized. T -RFLP analyses using universal bacterial primers showed few significant differences in overall bacterial community composition in ISR-active and inactive substrates (Ohio). In addition, the community members which were significantly different varied when different ISR-activecomposts were used (Ohio). To better characterize the shifts in microbial community structure during the development of ISR, population specific molecular tools were developed (Israel, Ohio).-PCR primers were designed to detect and quantify bacterial groups including Pyrenomycetes, Bacillus, Pan toea, Pseudomonas, Xanthomonas and Streptomyces as well as Trichoderma and Fusarium; two groups of fungi that harbor isolates which are ISR active (Isreal and Ohio). Bacterial consortia associated with cucumber plants grown in compost-amended potting mixtures were shown to be dominated by the phylogenetic taxon Bacteroidetes, including members of the genus Chryseobacterium, which in some cases have been shown to be involved in biocontrol (Israel). Nested-PCR-DGGE analyses coupled with long l6S rDNA sequencing, demonstrated that the Chryseobacteriumspp. detected on seed and the root in compost-amended treatments were derived from the compost itself. The most effective ISR inducing rhizobacterial strains were identified as Bacillus sp. based on partial sequencing of l6S rDNA. However, these strains were significantly less effective in reducing the severity of disease than Trichoderma hamatum382 (T382). A procedure was developed for inoculation of a compost-amended substrate with T -382 which consistently induced ISR in cucumber against Phytophthora blight caused by Phytophthora capsiciand in radish against bacterial spot (Ohio). Inoculation of compost-amended potting mixes with biocontrol agents such as T -382 and other microbes that induce systemic resistance in plants significantly increased the frequency of systemic disease control obtained with natural compost amendments.
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Zaldivar, R. J., G. S. Relick i J. M. Yang. Fiber Strength Utilization in Carbon/Carbon Composites: Part 2. Extended Studies With Pitch- and PAN-Based Fibers. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1998. http://dx.doi.org/10.21236/ada341676.
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Bryant, C. A., S. A. Wilks i C. W. Keevil. Survival of SARS-CoV-2 on the surfaces of food and food packaging materials. Food Standards Agency, listopad 2022. http://dx.doi.org/10.46756/sci.fsa.kww583.
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COVID-19, caused by the SARS-CoV-2 virus, was first reported in China in December 2019. The virus has spread rapidly around the world and is currently responsible for 500 million reported cases and over 6.4 million deaths. A risk assessment published by the Foods Standards Agency (FSA) in 2020 (Opens in a new window) concluded that it was very unlikely that you could catch coronavirus via food. This assessment included the worst-case assumption that, if food became contaminated during production, no significant inactivation of virus would occur before consumption. However, the rate of inactivation of virus on products sold at various temperatures was identified as a key uncertainty, because if inactivation does occur more rapidly in some situations, then a lower risk may be more appropriate. This project was commissioned to measure the rate of inactivation of virus on the surface of various types of food and food packaging, reducing that uncertainty. The results will be used to consider whether the assumption currently made in the risk assessment remains appropriate for food kept at a range of temperatures, or whether a lower risk is more appropriate for some. We conducted a laboratory-based study, artificially contaminating infectious SARS-CoV-2 virus onto the surfaces of foods and food packaging. We measured how the amount of infectious virus present on those surfaces declined over time, at a range of temperatures and relative humidity levels, reflecting typical storage conditions. We tested broccoli, peppers, apple, raspberry, cheddar cheese, sliced ham, olives, brine from the olives, white and brown bread crusts, croissants and pain au chocolat. The foods tested were selected as they are commonly sold loose on supermarket shelves or uncovered at deli counters or market stalls, they may be difficult to wash, and they are often consumed without any further processing i.e. cooking. The food packaging materials tested were polyethylene terephthalate (PET1) trays and bottles; aluminium cans and composite drinks cartons. These were selected as they are the most commonly used food packaging materials or consumption of the product may involve direct mouth contact with the packaging. Results showed that virus survival varied depending on the foods and food packaging examined. In several cases, infectious virus was detected for several hours and in some cases for several days, under some conditions tested. For a highly infectious agent such as SARS-CoV-2, which is thought to be transmissible by touching contaminated surfaces and then the face, this confirmation is significant. For most foods tested there was a significant drop in levels of virus contamination over the first 24 hours. However, for cheddar cheese and sliced ham, stored in refrigerated conditions and a range of relative humidity, the virus levels remained high up to a week later, when the testing period was stopped. Both cheddar cheese and sliced ham have high moisture, protein and saturated fat content, possibly offering protection to the virus. When apples and olives were tested, the virus was inactivated to the limit of detection very quickly, within an hour, when the first time point was measured. We suggest that chemicals, such as flavonoids, present in the skin of apples and olives inactivate the virus. The rate of viral decrease was rapid, within a few hours, for croissants and pain au chocolat. These pastries are both coated with a liquid egg wash, which may have an inhibitory effect on the virus. Food packaging materials tested had variable virus survival. For all food packaging, there was a significant drop in levels of virus contamination over the first 24 hours, in all relative humidity conditions and at both 6°C and 21°C; these included PET1 bottles and trays, aluminium cans and composite drinks cartons.