Relevant bibliographies by topics / Nanocomposites

Academic literature on the topic 'Nanocomposites'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 June 2024

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Journal articles on the topic "Nanocomposites"

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Abou El Fadl, Faten Ismail, Maysa A. Mohamed, Magida Mamdouh Mahmoud, and Sayeda M. Ibrahim. "Studying the electrical conductivity and mechanical properties of irradiated natural rubber latex/magnetite nanocomposite." Radiochimica Acta 110, no. 2 (November 22, 2021): 133–44. http://dx.doi.org/10.1515/ract-2021-1080.

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Abstract Nanocomposites have received voluminous interest due to the combination of unique properties of organic and inorganic component in one material. In this class, magnetic polymer nanocomposites are of particular interest because of the combination of excellent magnetic properties, stability, and good biocompatibility. This paper reports the preparation and characterization of nanocomposites films based on natural rubber in latex state (NRL) loaded with different concentrations of semiconducting magnetite nanoparticles (Fe3O4) (MNPs) (5, 10, 15, 20, and 30%). NRL (100%) and NRL/Fe3O4 nanocomposites were prepared by solution casting technique then, exposed to various irradiation doses (50, 70, 100 kGy).The nanocomposite’s morphological, and physical properties were investigated through various spectroscopic techniques such as Fourier-transformed infrared, X-ray diffraction, scanning electron, and transmission electron microscopies. The mechanical properties, including the tensile strength and elongation at break percentage (E b %) of the nanocomposites were also studied and compared with the 100% NRL films. Based on the results obtained from the mechanical study, it is found that the NRL/20% Fe3O4 nanocomposite film exhibited the highest tensile strength at 100 kGy. On the other hand, based on the conductivity study, it is found that, NRL/Fe3O4 nanocomposite with 10% magnetite exhibit the highest conductivity as the content of magnetite plays an important and effective role based on the high and homogeneous dispersity.
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Cho, Kie Yong, A. Ra Cho, Yun Jae Lee, Chong Min Koo, Soon Man Hong, Seung Sangh Wang, Ho Gyu Yoon, and Kyung Youl Baek. "Enhanced Electrical Properties of PVDF-TrFE Nanocomposite for Actuator Application." Key Engineering Materials 605 (April 2014): 335–39. http://dx.doi.org/10.4028/www.scientific.net/kem.605.335.

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Carbon nanotubes (CNTs) coated by compatibilizer (P3HT-PMMA) imparted sta-ble dispersion in organic solvents and polymer matrix (P(VDF-TrFE)). The compatibility be-tween CNTs with P3HT-PMMA was con rmed by measuring Raman spectroscopy. CoatedCNTs were then blended with P(VDF-TrFE) (70:30 mol%) to obtain polymer nanocompositesby solution- casting process. Polymer nanocomposites showed enhanced electrical characteris-tics, as nanocomposites near the threshold of the transition between P(VDF-TrFE) insulatorand CNT conductor revealed great improvement of electrical conductivity up to 10-6 S/cmat 1 KHz. Electromechanical properties of the polymer nanocomposite were examined as afunction of electric eld.
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Refaas, Ahmed Mesehour Ali, Enas M. AL-Robayi, and Ayad F. Alkaim. "Effect of Ag Doping on ZnO/V2O5 Nanoparticles as a Photo Catalyst for the Removal of Maxillion Blue (GRL) Dye." Asian Journal of Water, Environment and Pollution 20, no. 5 (October 9, 2023): 25–31. http://dx.doi.org/10.3233/ajw230062.

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In this research, the photo catalytic degradation of textile dyes as a model Maxillion Blue (GRL) dye by using Ag/ZnO/V2O5 nanocomposites synthesised via hydrothermal method. The physical properties of the as-synthesised nanocomposites were examined using characterisation techniques such as scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), TEM, and UV-vis spectroscopy. the production of pure ZnO, V2O5 nanoparticles and the discovery, by XRD analysis, of diffraction peaks related to the hexagonal phase of ZnO, V2O5, UV-vis spectroscopic calculations of the nanocomposite’s energy bandgap (2.63 eV) indicated that it might function as a photo catalyst when exposed to UV-visible light. XRD also supported the fabrication of the ZnO/V2O5 nanocomposite. FE-SEM images showed that the object was spherical and somewhat hexagonal in form. EDX analysis reveals the presence of Zn, V, and O in the nanocomposite; its photocatalytic activity was evaluated through the degradation of GRL dye under exposure to solar light. The results showed that the optimum mass nanocomposite for efficient photo degradation was 0.4 g/L, with a degradation efficiency of 91.6%.
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Elderdery, Abozer Y., Badr Alzahrani, Siddiqa M. A. Hamza, Gomaa Mostafa-Hedeab, Pooi Ling Mok, and Suresh Kumar Subbiah. "Synthesis, Characterization, and Antiproliferative Effect of CuO-TiO2-Chitosan-Amygdalin Nanocomposites in Human Leukemic MOLT4 Cells." Bioinorganic Chemistry and Applications 2022 (September 26, 2022): 1–13. http://dx.doi.org/10.1155/2022/1473922.

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The main aim of this study was to synthesize copper oxide- (CuO-) titanium oxide- (TiO2-) chitosan-amygdalin nanocomposites (CTCANc) and to characterize them physically and biologically (antimicrobial and anticancer activity using MOLT4 blood cancer cell line) to endorse their useful applications as potential drug candidates in anticancer avenues. CuO-TiO2-chitosan-amygdalin nanocomposites were synthesized according to standard, reported methods. Physical characterization of the nanocomposites was performed using methods like X-ray diffractometer (XRD), and morphological and ultrastructural analysis of nanocomposites were done using electron microscope scanning and transmission. FTIR was recorded using a Perkin-Elmer spectrometer, and photoluminescence (PL) spectra were done using the spectrometer. Further, antibacterial activities were assessed using standard bacterial cultures. To demonstrate the nanocomposite’s anticancer effects, MTT assay, morphological analysis, apoptosis studies using acridine orange/ethidium bromide (AO/EtBr) dual staining, reactive oxygen species (ROS) analysis, and levels of antioxidant enzymes were analyzed using the MOLT4 blood cancer cell line. Synthesized nanocomposites were characterized using XRD and showed various peaks, respectively, for CuO-TiO2, amygdalin, and chitosan. MTT assay indicated an IC50 value of 38.41 μg/ml concentration of CTCANc. Hence, 30 and 40 μg/ml were used for the subsequent experiments. Morphological analysis, staining for apoptosis using AO/EtBr, mitochondrial membrane potential (MMP or ΔΨm) analysis, ROS analysis, and determination of the SOD, CAT, MDA, and GSH levels were performed. Observations like a significant loss of morphology, induction of apoptosis, elevated ROS, and decreased MMP were significant in 30 and 40 μg/ml nanocomposite-treated cells when compared to control cells. The bimetallic nanocomposites exhibited typical nanocomposites characteristics and significant antibacterial and anticancer effects. The study results endorse the antibacterial, anticancer activity of CuO-TiO2-chitosan-amygdalin nanocomposites and strongly suggest that further in-depth research using CuO-TiO2-chitosan-amygdalin nanocomposites could reveal their efficacy in the clinical scenario.
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Dar, Amara, Rabia Rehman, Ayesha Mohyuddin, Maria Aziz, Jamil Anwar, Gashew Tadele, Noor Mohammed Kadhim, Ali H. Alamri, and Rami M. Alzhrani. "Efficacy of Various Types of Berries Extract for the Synthesis of ZnO Nanocomposites and Exploring Their Antimicrobial Potential for Use in Herbal Medicines." BioMed Research International 2022 (August 16, 2022): 1–9. http://dx.doi.org/10.1155/2022/9914173.

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Nanoscience has developed various greener approaches as an alternate method for the synthesis of nanoparticles and nanocomposites. The present study discusses the efficacy of berries extract for the synthesis of ZnO nanocomposites. Characterization of synthesized nanocomposite were done by SEM, UV/VIS spectrophotometry, Fourier transform infrared (FTIR) spectroscopy, and XRD techniques. The crystalline nature of the synthesized nanoparticles was verified by XRD pattern in the range of 10-80 nm. The UV absorption peak of Elaeagnus umbellata (ZnO-EU) nanocomposite at 340 nm, Rubus idaeus (ZnO-Ri) nanocomposite at 360 nm, and Rubus fruticosus (ZnO-Rf) nanocomposite at 360 nm was observed. The nanocomposites were analyzed for their antimicrobial activity and found to be effective against three phytopathogens. The antimicrobial activity of ZnO nanocomposites showed good results against Escherichia coli (341), Staphylococcus aureus (345B), and Pseudomonas aeruginosa (5994 NLF). This study presents a simple and inexpensive approach for synthesizing zinc oxide nanocomposites with effective antibacterial activity.
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Tesarikova, Alice, Dagmar Merinska, Jiri Kalous, and Petr Svoboda. "Ethylene-Octene Copolymers/Organoclay Nanocomposites: Preparation and Properties." Journal of Nanomaterials 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/6014064.

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Two ethylene-octene copolymers with 17 and 45 wt.% of octene (EOC-17 and EOC-45) were compared in nanocomposites with Cloisite 93A. EOC-45 nanocomposites have a higher elongation at break. Dynamical mechanical analysis (DMA) showed a decrease oftan⁡δwith frequency for EOC-17 nanocomposites, but decrease is followed by an increase for EOC-45 nanocomposites; DMA showed also increased modulus for all nanocomposites compared to pure copolymers over a wide temperature range. Barrier properties were improved about 100% by addition of organoclay; they were better for EOC-17 nanocomposites due to higher crystallinity. X-ray diffraction (XRD) together with transmission electron microscopy (TEM) showed some intercalation for EOC-17 but much better dispersion for EOC-45 nanocomposites. Differential scanning calorimetry (DSC) showed increased crystallization temperatureTcfor EOC-17 nanocomposite (aggregates acted as nucleation agents) but decreaseTcfor EOC-45 nanocomposite together with greatly influenced melting peak. Accelerated UV aging showed smaller C=O peak for EOC-45 nanocomposites.
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Lai, Josephine Chang Hui, Md Rezaur Rahman, and Sinin Hamdan. "Physical, Mechanical, and Thermal Analysis of Polylactic Acid/Fumed Silica/Clay (1.28E) Nanocomposites." International Journal of Polymer Science 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/698738.

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Polylactic acid/fumed silica/clay (PLA/FS/clay) (1.28E) nanocomposites have been successfully prepared by solution-intercalation film-casting technique. The resultant nanocomposites were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), tensile test, thermogravimetric analysis (TGA), and moisture absorption test. The FT-IR spectrum indicated that PLA/FS/clay with 2 wt% had much broader peak compared to 5 wt%, 10 wt%, and 15 wt% nanocomposites. Incorporation of clay (1.28E) with 2 wt% showed the best compatibility with PLA/FS matrix. PLA/FS/clay (1.28E) nanocomposite with 2 wt% of clay loading had higher tensile strength and modulus compared to other nanocomposites. The thermal stability and activation energy of 2 wt% of PLA/FS/clay (1.28E) nanocomposite are the highest among all the nanocomposites. The moisture absorbed into PLA/FS/clay (1.28E) nanocomposite was significantly reduced with clay loading of 2 wt%.
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Soni, Kriti, Ali Mujtaba, Md Habban Akhter, and Kanchan Kohli. "The Development of Pemetrexed Diacid-Loaded Gelatin-Cloisite 30B (MMT) Nanocomposite for Improved Oral Efficacy Against Cancer: Characterization, In-Vitro and Ex-Vivo Assessment." Current Drug Delivery 17, no. 3 (April 26, 2020): 246–56. http://dx.doi.org/10.2174/1567201817666200210120231.

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Aim: The intention of this investigation was to develop Pemetrexed Diacid (PTX)-loaded gelatine-cloisite 30B (MMT) nanocomposite for the potential oral delivery of PTX and the in vitro, and ex vivo assessment. Background: Gelatin/Cloisite 30 B (MMT) nanocomposites were prepared by blending gelatin with MMT in aqueous solution. Methods: PTX was incorporated into the nanocomposite preparation. The nanocomposites were investigated by Fourier Transmission Infra Red Spectroscopy (FT-IR), Differential Scanning Calorimetry (DSC), Scanning Electron Microscope (SEM) X-Ray Diffraction (XRD) and Confocal Laser Microscopy (CLSM). FT-IR of nanocomposite showed the disappearance of all major peaks which corroborated the formation of nanocomposites. The nanocomposites were found to have a particle size of 121.9 ± 1.85 nm and zeta potential -12.1 ± 0.63 mV. DSC thermogram of drug loaded nanocomposites indicated peak at 117.165 oC and 205.816 oC, which clearly revealed that the drug has been incorporated into the nanocomposite because of cross-linking of cloisite 30 B and gelatin in the presence of glutaraldehyde. Results: SEM images of gelatin show a network like structure which disappears in the nanocomposite. The kinetics of the drug release was studied in order to ascertain the type of release mechanism. The drug release from nanocomposites was in a controlled manner, followed by first-order kinetics and the drug release mechanism was found to be of Fickian type. Conclusion: Ex vivo gut permeation studies revealed 4 times enhancement in the permeation of drug present in the nanocomposite as compared to plain drug solution and were further affirmed by CLSM. Thus, gelatin/(MMT) nanocomposite could be promising for the oral delivery of PTX in cancer therapy and future prospects for the industrial pharmacy.
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Kausar, Ayesha. "A review of fundamental principles and applications of polymer nanocomposites filled with both nanoclay and nano-sized carbon allotropes – Graphene and carbon nanotubes." Journal of Plastic Film & Sheeting 36, no. 2 (October 21, 2019): 209–28. http://dx.doi.org/10.1177/8756087919884607.

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Advancements in polymer/nanoclay nanocomposites have supported the development of distinctive preparation strategies and characteristic features. High-performance polymer/nanoclay nanocomposites have applications in aerospace, automotive, construction, environmental, and biomedicine. To further improve polymer/nanoclay nanocomposite performance, nanoclay nanobifillers have been considered. In this regard, nano-sized carbon allotropes are potential contenders to form nanoclay nanobifillers. This article presents a detailed and state-of-the-art review on polymer/nanoclay nanobifiller nanocomposites. The primary focus of this pioneering effort is to deliver an up-to-date overview on polymer/nanoclay nanobifiller nanocomposites along with their categorization, fabrication, properties, and uses. Nanoclay nanobifiller designs using carbon nanotube, graphene, and fullerene are considered. Consequently, ensuing nanocomposite categories are discussed including polymer/nanoclay-carbon nanotube, polymer/nanoclay-graphene, and polymer/nanoclay-fullerene nanocomposites. The dispersion properties and alignment of nanoclay nanobifiller in polymeric nanocomposites have been investigated. Enhancing the interfacial bonding strength between matrix and nanoclay nanobifiller enhances the resulting nanocomposite physical properties. Application areas for polymer/nanoclay nanobifiller nanocomposites include supercapacitors, non-flammable materials, and self-healing materials. The discussion also highlights potential future directions for this emerging research field. Forthcoming advancements in polymer/nanoclay nanobifiller nanocomposites must focus the intensive design control, nanobifiller functionality, new processing techniques, superior dispersion, and enhanced features to further broaden the application prospects of these materials.
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Yuan, Xin Hua, Li Yin Han, Qiu Su, Wen Hua Guo, Hong Xing Xu, Qian Zhang, Yan Qiu Chen, Jie Cheng, Kang Sun, and Xin Lei Chen. "Synthesis and Properties of a Novel Si-Ti Polymer/Montmorillonite Nanocomposites." Key Engineering Materials 636 (December 2014): 85–88. http://dx.doi.org/10.4028/www.scientific.net/kem.636.85.

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Using methyl triethoxysilane, tetrabutyl titanate and ethyl acetoacetate as raw materials, the Si-Ti polymer was synthesized to prepare Si-Ti polymer/montmorillonite nanocomposites. The effects of OMMT content on the impact properties and barrier performance of nanocomposites were investigated. The results show that with the increasing of OMMT content, the impact properties of nanocomposites are improved significantly. The impact strength of nanocomposite with 10wt% OMMT is about twice times than that without OMMT. The gas barrier properties of nanocomposites are also improved significantly. Compared with pure Si-Ti polymer, the water absorption of nanocomposite with 6wt% OMMT is decreased by 60.3%.
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Dissertations / Theses on the topic "Nanocomposites"

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Su, Xing. "Polymer/montmorillonite nanocomposites : polyamide 6 nanocomposites and polyacrylamide nanocomposite hydrogels." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18366/.

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Polymer/clay nanocomposites have attracted great attention of researchers for two decades because they are light in weight, easy to be fabricated, and have some unique properties such as thermal barrier and corrosion resistant. Montmorillonite (MMT) is frequently chosen as the clay filler for polymer/clay nanocomposites because of its abundance, high functionality and high cation exchange capacity. This project aims to prepare novel polymer/MMT nanocomposites with adjustable microstructure, good mechanical properties and unique stimuli-sensitive properties. As the control over the clay intercalation/exfoliation ratio is difficult for the polymer/clay nanocomposites, the effect on clay exfoliation of polyamide 6/MMT nanocomposites by using a chemical blowing agent (CBA), citric acid, during extrusion was studied. X-ray diffraction confirmed that the decomposition of CBA did improve clay exfoliation. As many surfactants used for treating clay surface are likely to degrade during the melt processing of polymer/MMT nanocomposites, a novel thermally stable surfactant was used. Polyamide 6/MMT nanocomposites were prepared by either twice or triple extrusion. And the effect on the mechanical properties and thermal stability were studied. The incorporation of clays increased Young’s modulus but decreased strain at break. There was no significant improvement on the thermal stability by the incorporation of clays and/or CBA. Polymer nanocomposite hydrogels often showed high hysteresis when subject to cyclic tension, and their mechanical properties were hardly tested at the fully swollen state. Therefore a novel polyacrylamide (PAM)/polysaccharide-treated MMT nanocomposite hydrogel with low cyclic tensile hysteresis was successfully prepared by in situ polymerisation. This was shown to be stretchable, tough and highly compression-resistant at the fully swollen state. An interpenetrating nanocomposite hydrogel using PAM, MMT, alginate and Ca2+ was proposed in the same chapter. At the fully swollen state, apart from the good mechanical properties such as stretchability, toughness and resilience, it displayed significantly pH-dependant shape changes. As for the current alginate/MMT nanocomposites in the literature, only the mechanical properties under the dry state were studied. The mechanical properties of the fully swollen alginate/MMT/Ca2+ nanocomposite were investigated. The nanocomposite films turned out to be stiff, strong and transparent. Also some of the nanocomposite films were ultraviolet light-proof or sensitive to acetone. Based on the above findings, it is concluded that: firstly, there was a large amount of residual citric acid in the extruded materials, which reduced the mechanical properties and thermal stability of polyamide 6/MMT nanocomposites. Secondly, the thermally stable polymeric surfactant has the potential of enhancing the toughness and thermal stability of polyamide 6/MMT nanocomposites. Thirdly, it was likely to achieve low cyclic-tensile hysteresis, high strength, high toughness and stimuli-responsivity by the polymer/clay nanocomposite hydrogels at the fully swollen state. Those nanocomposite hydrogels can be used in a variety of applications including artificial tissues, medicine, agriculture, skin care and other aquatic uses.
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Coelho, Caio Parra Dantas. "Obtenção e caracterização de nanocompósitos de poliestireno e argilas esmectíticas." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-05082009-165838/.

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Neste trabalho foram preparados nanocompósitos de Poliestireno (PS) e argilas organofílicas. As argilas, inicialmente hidrofílicas, foram modificadas organicamente utilizando três sais quaternários de amônio diferentes: Cloreto de hexadecil trimetil amônio (CTAC), Cloreto de alquil dimetil benzil amônio (Dodigen) e Cloreto de dimetil dioctadecil amônio (Praepagen). A argila organofílica Cloisite 20A foi também utilizada neste estudo. Os nanocompósitos foram preparados por intercalação no polímero fundido por três técnicas diferentes: adição de argila em suspensão de álcool etílico por uma bomba dosadora de líquidos durante a extrusão, adição de argila em pó por um alimentador mecânico durante a extrusão e adição de suspensão de argila em álcool etílico durante obtenção por batelada. Os materiais obtidos foram caracterizados por difração de raios-X (DRX), microscopia óptica (MO) e microscopia eletrônica de transmissão (MET) e ensaios reológicos de Cisalhamento Oscilatório de Pequenas Amplitudes (COPA). As propriedades térmicas foram analisadas por análise termogravimétrica (TG) e as propriedades mecânicas foram analisadas por ensaios de tração e impacto Izod. As três técnicas se mostraram eficazes na preparação dos nanocompósitos, e seus resultados apresentaram uma similaridade muito grande. Os resultados de DRX e microscopia mostraram que a maioria dos nanocompósitos apresentou estruturas compostas de fases intercaladas e esfoliadas. As análises térmicas mostraram que a adição de argila ao PS o tornou mais estável termicamente, suportando maiores temperaturas antes de iniciar o processo de degradação. Os ensaios reológicos de COPA e ensaios mecânicos dos nanocompósitos obtidos não apresentaram grandes variações em relação ao PS puro.
In this work nanocomposites of polystyrene (PS) and organophilic clays were prepared. The clays were organically modified using three different ammonium quaternary salts: cetyltrimethyl ammonium chloride (commercial name: CTAC), alquildimethyl benzyl ammonium chloride (commercial name: Dodigen) and distearyl dimethyl ammonium chloride (commercial name: Praepagen). The organoclay Cloisite 20 A was also used in this work. The nanocomposites were prepared by melt intercalation using three different techniques: adding the organoclay as a diluted organic solvent supension to the extruder using a motor-driven metering pump, adding the organoclay as powder to the extruder using a mechanical feeder and adding the organoclay as a diluted organic solvent suspension to the mixer. The materials obtained were characterized by X-ray diffraction (XRD), optical microscopy (OM), transmission electron microscopy (TEM) and by rheological studies through small amplitude oscillatory shear tests (SAOS). The thermal properties were studied by thermogravimetrical analyses (TG) and the mechanical properties were studied by tensile and impact Izod strength tests. The three techniques were efficient to prepare nanocomposites, and their results were very similar. The DRX and microscopy results showed that the most nanocomposites presented structures composed by intercalated and exfoliated phases. The thermal analyses showed that the addition of organoclay turned PS more thermally stable, increasing their degradation temperatures. The results of rheological studies (SAOS) and the mechanical tests did not present significant variations compared to the neat PS.
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Tong, Wan. "Characterisation of PA/clay nanocomposite and glass fibre filled PA/clay nanocomposites." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439857.

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Karabulut, Metin. "Production And Characterization Of Nanocomposite Materials From Recycled Thermoplastics." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1255728/index.pdf.

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Nanocomposites are a new class of mineral-field plastics that contain relatively small amounts (<
10%) of nanometer-sized clay particles. The particles, due to their extremely high aspect ratios (about 100-15000), and high surface area (in excess of 750-800 m2/g) promise to improve structural, mechanical, flame retardant, thermal and barrier properties without substantially increasing the density or reducing the light transmission properties of the base polymer. Production of thermoplastic based nanocomposites involves melt mixing the base polymer and layered silicate powders that have been modified with hydroxyl terminated quaternary ammonium salt. During mixing, polymer chains diffuse from the bulk polymer into the van der Waals galleries between the silicate layers. In this study, new nanocomposite materials were produced from the components of recycled thermoplastic as the matrix and montmorillonite as the filler by using a co-rotating twin screw extruder. During the study, recycled poly(ethylene terepthalate), R-PET, was mixed with organically modified quaternary alkylammonium montmorillonite in the contents of 1, 2, and 5 weight %. Three types of clays were evaluated during the studies. For comparison, 2 weight % clay containing samples were prepared with three different clay types, Cloisite 15A, 25A, 30B. The nanocomposites were prepared at three different screw speeds, 150, 350, 500 rpm, in order to observe the property changes with the screw speed. Mechanical tests, scanning electron microscopy and melt flow index measurements were used to characterize the nanocomposites. The clay type of 25A having long alkyl sidegroups gave the best results in general. Owing to its branched nature, in nanocomposites with 25A mixing characteristics were enhanced leading to better dispersion of clay platelets. This effect was observed in the SEM micrographs as higher degrees of clay exfoliation. Nearly all the mechanical properties were found to increase with the processing speed of 350 rpm. In the studies, it was seen that the highest processing speed of 500 rpm does not give the material performance enhancements due to higher shear intensity which causes defect points in the structure. Also the residence time is smaller at high screw speeds, thus there is not enough time for exfoliation. In general, the MFI values showed minimum, thus the viscosity showed a maximum at the intermediate speed of 350 rpm. At this processing speed, maximum exfoliation took place giving rise to maximum viscosity. Also, the clay type of 25A produced the lowest MFI value at this speed, indicating the highest degree of exfoliation, highest viscosity, and best mechanical properties.
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Bera, Chandan. "Thermo electric properties of nanocomposite materials." Phd thesis, Ecole Centrale Paris, 2010. http://tel.archives-ouvertes.fr/tel-00576360.

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Cette thèse présente une étude théorique du transport de chaleur dans les matériaux composites nano poreux et nano fils ainsi qu'une étude théorique des propriétés thermoélectriques de l'alliage Si0:8Ge0:2 confrontée à des mesures expérimentales réalisées pour une partie, dans le cadre de l'étude.La première étude démontre que les alliages poreux affichent des réductions de conductivité thermique à des dimensions de pores beaucoup plus grandes que les matériaux poreux non alliés de même porosité nominale. Si on considère une taille de pores de 1000nm, la conductivité thermique de l'alliage Si0:5Ge0:5 avec 0:1 de porosité est deux fois plus faible que la conductivité thermique d'un matériau non poreux, alors que les pores plus petits que 100 nm sont nécessaires pour obtenir la même réduction relative dans le Si ou Ge pur. Nos résultats indiquent que les alliages nano poreux devraient être avantageux devant les matériaux nano poreux non alliés, et ceux pour les applications nécessitant une faible conductivité thermique, tels que les nouveaux matériaux thermoélectriques.La deuxième étude théorique sur la conductance thermique de nano fils révèle l'effet de la structure sur le transport des phonons. Avec un modèle théorique qui considère la dépendance en fréquence du transport des phonons, nous sommes en mesure quantitativement de rendre compte des résultats expérimentaux sur des nano fils droits et coudés dans la gamme de température qui montre qu'un double coude sur un fil réduit sa conductance thermique de 40% à la température de 5K. Enfin, nous avons procédé à une approche théorique des propriétés thermoélectriques des alliages SiGe frittés, en les comparant aux mesures expérimentales nouvelles et antérieures, tout en évaluant leur potentiel d'amélioration. L'approche théorique a été validée par comparaison de la mobilité prévue et la conductivité thermique prévues, en faisant varier la quantité de Ge et les concentrations de dopage, dans une gamme de température comprise entre 300 et 1000K. Nos calculs suggèrent qu'une optimisation par rapport à l'état de l'art actuel est possible pour le matériau de type n et type p, conduisant potentiellement à une augmentation de 6% (5%) du ZT _a 1000K et 25% (4%) _a température ambiante. Même des améliorations plus grandes devraient être possibles si la probabilité de diffusion des phonons aux joints de grains pouvait être augmentée au-delà de sa valeur actuelle de 10%.
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Sengezer, Engin Cem. "Multifunctional Nanocomposites and Particulate Composites with Nanocomposite Binders for Deformation and Damage Sensing." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/78782.

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At present, structural health monitoring efforts focus primarily on the sensors and sensing systems for detecting instances and locations of damage through techniques such as X-ray, micro CT, acoustic emission, infrared thermography, lamb wave etc., which only detect cracks at relatively large length scales and rely heavily on sensors and sensing systems which are external to the material system. As an alternative to conventional commercially available SHM techniques, the current work explores processing-structure-property relationships starting from carbon nanotube (CNT) based nanocomposites to particulate composites with nanocomposite binder/matrix materials, i.e. hybrid particulate composites to investigate deformation and damage sensing capabilities of inherently sensing materials and structures through their piezoresistive (coupled electro-mechanical) response. Initial efforts focused on controlling the dispersion of CNTs and orientation of CNT filaments within nanocomposites under dielectrophoresis to guide design and fabrication process of nanocomposites by tuning CNT concentration, applied AC electric field intensity, frequency and exposure time. It is observed that a combination of exposure time to AC electric field and the AC field frequency are the key drivers of filament width and spacing and that the network for filament formation is much more efficient for pristine CNTs than for acid treated functionalized CNTs. With the knowledge obtained from controlling the morphological features, AC field-induced long range alignment of CNTs within bulk nanocomposites was scaled up to form structural test coupons. The morphology, electrical and mechanical properties of the coupons were investigated. The anisotropic piezoresistive response both for parallel and transverse to CNT alignment direction within bulk composite coupons under various loading conditions was obtained. It is observed that control of the CNT network allows for the establishment of percolation paths and piezoresistive response well below the nominal percolation threshold observed for random, so called well-dispersed CNT network distributions. The potential for use of such bulk nanocomposites in SHM applications to detect strain and microdamage accumulation is further demonstrated, underscoring the importance of microscale CNT distribution/orientation and network formation/disruption in governing the piezoresistive sensitivities. Finally, what may be the first experimental study in the literature is conducted for real-time embedded microscale strain and damage sensing in energetic materials by distributing the CNT sensing network throughout the binder phase of inert and mock energetic composites through piezoresistive response for SHM in energetic materials. The incorporation of CNTs into inert and mock energetic composites revealed promising self-diagnostic functionalities for in situ real-time SHM applications under quasi-static and low velocity impact loading for solid rocket propellants, detonators and munitions to reduce the stochastic nature of safety characterization and help in designing insult tolerant energetic materials.
Ph. D.
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Smith, Jon Anthony. "Polyaniline Gold Nanocomposites." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4900.

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Polyaniline/Gold Nanocomposites J. Anthony Smith 141 Pages Directed by Dr. Ji and #345;?anata The expectation that it is possible to create a range of new materials from two basic components, polyaniline fibers and gold particles is explored. Three synthetic methods were employed each of which created different materials and required different investigation techniques. The methods are: chemical, one step aniline oxidation / AuCl4- reduction; electrochemical/chemical, a two-step composite growth achieved by electrochemical polyaniline thin film growth followed by film immersion in AuCl4- solution and spontaneous reduction to gold particles; electrochemical, resulting in freestanding polyaniline thin film/Au nanoparticles carried out by electrochemical stripping of a polyaniline thin film grown over a sacrificial gold layer in the presence halide solutions. The incorporation of particles was shown to affect film morphology and electrical properties in all synthetic methods. The changes are in large part attributed to the development of a contact potential between the polyaniline and the gold particles. Applications for the composites include use as chemically sensitive layers, corrosion inhibition materials, and use as probes to evaluate nanoparticle substrate interactions.
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Mohaddes, pour Ahmad. "Granular polymer nanocomposites." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=117135.

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Contrary to classical theories, nanoparticle dispersion in polymer melt has been shown to decrease the bulk viscosity, and to increase the membrane permeability and selectivity when incorporated into certain amorphous polymer glasses. However, the effects of particle concentration, particle size, and polymer configuration at particle interfaces are not well understood. To elucidate how the particle size, chain length, and mixture composition influence polymer-chain packing and, thus, free volume---which is known to primarily influence rheological and permeation properties of polymer nanocomposites---the volume of acrylic spheres (representing nanoparticles) mixed with aluminum ball chains (representing polymer chains) was measured, and the partial molar sphere volume at small but finite sphere volume fractions was calculated. The results show that the sphere radius with respect to the minimum chain loop size is the primary dimensionless parameter that affects mixture free volume. Moreover, free volume is maximal---up to twice the intrinsic inclusion volume per particle---when the sphere radius and the minimum chain loop size are comparable, which is because of the increase in sphere-chain interactions, whereas sphere-sphere interactions decrease the mixture free volume when particles are large. It was further determined that, in the presence of nanoparticles, free volume and polymer chain architecture play a determinative role in influencing the glass transition temperature of polymer nanocomposites. The reason for the decrease in the glass transition temperature of polymer nanocomposites is known to be the repulsive chain-nanoparticle interactions. However, in the absence of enthalpic interactions, it is still elusive how and why the glass transition temperature declines with nanoparticle loading. To examine the nanoparticle influence on chain relaxation dynamics and, thus, nanocomposite glass transition temperature, the relaxation time (the time to reach the close-packed, jammed state) of granular chain-sphere mixtures was measured by systematically changing the sphere size, chain length, and mixture composition. Measuring the compaction dynamics reveals that spherical inclusions profoundly influence the chain relaxation time when the characteristic nanoparticle separation and nanoparticle size are comparable to the chain loop size. This study can shed light on polymer architecture in the presence of nanoparticles, especially when chains are very long and, thus, beyond the capability of current computer simulations. This macroscopic, granular model can also be used to optimize the design of polymer nanocomposites by a judicious choice of nanoparticle size, chain length, and mixture composition for industrial and biomedical applications.
Contrairement aux théories classiques, les nanoparticules ont été utilisées pour diminuerla viscosité de volume lorsqu'elles sont dispersées dans un mélange de polymère, et pour augmenter la perméabilité de la membrane et la sélectivité lorsqu'elles sont incorporées dans certains verres polymères amorphes. Cependant, les effets sur la concentration des particules, sur la taille des particules et sur la configuration des polymères à particules inter faciales ne sont pas bien compris. Afin de comprendre comment la taille des particules, la longueur de la chaîne, et les différentes compositions influencent l'assemblage des chaines de polymères et, par conséquent, le volume libre — qui est connu principalement pour agir sur les propriétés rhéologiques et d'infiltration despolymères nanocomposites—le volume de sphères acryliques (représentant les nanoparticules) couplé avec les chaînes de billes d'aluminium (ce qui représente des chaînes de polymère) a été mesurée, et le volume molaire partiel des sphères a été calculée à partir depetit volume fini . Les résultats montrent que le rayon de la sphère par rapport à la taille dela boucle de la chaîne minimum est le paramètre qui affecte principalement la dimensiondu volume de mélange libre. De plus, le volume libre est maximale—jusqu'à deux fois levolume de l'inclusion intrinsèque par particule—lorsque le rayon de la sphère et la taille minimum de la boucle de la chaîne sont comparables, ce qui est d à l'augmentation des interactions dans la chaîne de la sphère, alors que les interactions sphère-sphère diminuent le volume du mélange libre lorsque les particules sont grandes. Il a également été déterminé que, en présence de nanoparticules, le volume libre et l'architecture de la chaîne du polymère jouent un rôle déterminant en influençant la température de transition vitreuse des polymères nano composites. La raison ostensible pour la diminution dela température de transition vitreuse des polymères nano composites est connue pour tre la répulsion entre les chaînes des nanoparticules. Toutefois, en l'absence d'interactions enthalpiques, c'est encore élusif de comment et pourquoi la température de transition vitreuse baisse avec le chargement des nanoparticules. Pour étudier l'influence des nanoparticules sur la dynamique de relaxation de la chaîne et, par conséquent, la température de transition de verre nanocomposite, le temps de relaxation (le temps d'atteindre l'état bloqué) de la chaine du mélange de granulés a été mesurée en changeant systématiquement la taille et la longueur de la sphère et le mélange de la composition. D'avoir mesurer la dynamique de compactage révèle que les inclusions sphériques influencent profondément le temps de relaxation de la chaîne lors de la séparation des nanoparticules caractéristiques ainsi que la taille des nanoparticules est comparable à la taille de la boucle de chaîne. Cette étude nous éclaire sur l'architecture des polymères en présence de nanoparticules, en particulier lorsque les chaînes sont très longues et par conséquent, au-delà de la capacité des simulations informatiques actuels pour être explorées à fond. Ce modèle macroscopique granulaire peut aussi être utilisé pour optimiser la conception de polymères nanocomposites par un choix judicieux de la taille des nanoparticules, de la longueur de la chaîne et la composition du mélange pour des applications industrielles et biomédicales.
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Sontikaew, Somchoke. "PET/organoclay nanocomposites." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/3280.

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This thesis looks at the study of nanocomposites of Poly(ethylene terephthalate) and organoclays. Two methods of materials blending are investigated for the production of the nanocomposites: solvent blending and melt blending. The main objectives were the investigation of the influence of organoclays and processing conditions on morphological, rheological, mechanical properties, crystal structure and isothermal crystallization kinetics of the nanocomposite and a comparison with unfilled PET. In solvent blending, the use of long sonication time and epoxy led to the formation of a two-dimensional network structure of long, thin particles in a solvent blended PET nanocomposite at low clay loading. The clay network structure seemed not to affect the tensile properties. The long, thin particles were able to be separated and dispersed further by high shear in a twin screw extruder, resulting in a high level of separation and dispersion. The crystallization of the solvent blended nanocomposite was not only influenced by the nanoclay but also by the residual solvent. The extent of clay dispersion did not affect the crystallization of the solvent blended sample. Both solvent blended and melt blended nanocomposites showed that increasing the amount of surfactant improved the degree of nanoclay dispersion in the PET that led to an enhancement in the tensile properties of the nanocomposite compared to the unfilled polymer. The degradation of the organoclay during melt blending did not limit the nanoclay dispersion in the PET. The low thermal stability of the organoclay reduced the strength of the crystalline nanocomposite but it did not affect the strength of the amorphous nanocomposite. In contrast to the solvent blended sample, the extent of clay dispersion influenced the crystallization of the melt blended sample. The poorly dispersed particles were more efficient in nucleating PET crystallization than the well dispersed particles. The crystallization rate of PET increased as the surfactant concentration decreased.
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Elder, Judith. "PMMA clay nanocomposites." Thesis, Durham University, 2009. http://etheses.dur.ac.uk/52/.

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Polymer clay nanocomposites (PCN) of poly(methyl methacrylate) (PMMA) and clay, were synthesised in-situ using a free radical suspension polymerisation technique. The weight fraction of clay in the PCN was systematically varied in order to understand the effect of clay on the physical properties of the resulting PCNs. However, unexpectedly it was found that the weight fraction of clay had a dramatic impact upon the molecular weight of the polymer matrix and a relationship between clay concentration and polymer molecular weight was established. Furthermore, it was also found that the change in molecular weight was dependent upon the clay type. Three different clay types were investigated; an organically modified montmorillonite (Cloisite 15a), a synthetic clay (Laponite RD) and a PEO modified Laponite RD. To produce the modified Laponite RD, mono amino PEO was synthesised via anionic polymerisation using dimethyl ethanol amine as an initiator. The modification of the Laponite RD clay took place in the reaction flask prior to the suspension polymerisation of the PCN. The PCN were characterised using size exclusion chromatography (SEC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and oscillatory shear rheology. Morphological studies of the PCN showed that the extent of clay dispersion depended on the clay type. Within the PMMA/Laponite RD nanocomposites an unusual network structure was formed, which appeared to be continuous throughout the material. Thermal properties of the PCN were investigated using DSC, TGA and Microcalorimetry. From oscillatory shear rheology, the full master curves for the PCN were obtained by applying the time-temperature superposition (TTS) principle. To quantify the effect of the clay upon the rheology, the experimental data was compared to the time dependent diffusion model of Des Cloizeaux for polydisperse polymer melts, which enables polydispersity to be incorporated through the use of the molecular weight distribution obtained via SEC.
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Books on the topic "Nanocomposites"

1

Knauth, Philippe, and Joop Schoonman, eds. Nanocomposites. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-68907-4.

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Nicolais, Luigi, and Gianfranco Carotenuto, eds. Nanocomposites. Hoboken, NJ: John Wiley & Sons, Inc, 2013. http://dx.doi.org/10.1002/9781118742655.

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Singh, N. B. Nanocomposites. New York: Jenny Stanford Publishing, 2022. http://dx.doi.org/10.1201/9781003314479.

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Bhattacharya, Sati N., Musa R. Kamal, and Rahul K. Gupta. Polymeric Nanocomposites. München: Carl Hanser Verlag GmbH & Co. KG, 2007. http://dx.doi.org/10.3139/9783446418523.

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Huang, Xingyi, and Chunyi Zhi, eds. Polymer Nanocomposites. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28238-1.

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Njuguna, James, ed. Structural Nanocomposites. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40322-4.

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Oksman, Kristiina, and Mohini Sain, eds. Cellulose Nanocomposites. Washington, DC: American Chemical Society, 2006. http://dx.doi.org/10.1021/bk-2006-0938.

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Krishnamoorti, Ramanan, and Richard A. Vaia, eds. Polymer Nanocomposites. Washington, DC: American Chemical Society, 2001. http://dx.doi.org/10.1021/bk-2002-0804.

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Mittal, Vikas, ed. Thermoset Nanocomposites. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527659647.

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Dufresne, Alain, Sabu Thomas, and Laly A. Pothen, eds. Biopolymer Nanocomposites. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118609958.

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Book chapters on the topic "Nanocomposites"

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Ray, Suprakas Sinha. "Nanocomposites." In Poly(Lactic Acid), 311–22. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470649848.ch19.

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Tasnim, Nishat, Baiju G. Nair, Katla Sai Krishna, Sudhakar Kalagara, Mahesh Narayan, Juan C. Noveron, and Binata Joddar. "Nanocomposites." In Frontiers in Nano-therapeutics, 55–66. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3283-7_5.

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Alexandre, Michaël, and Philippe Dubois. "Nanocomposites." In Macromolecular Engineering, 2033–70. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527631421.ch49.

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Rahmandoust, Moones, and Majid R. Ayatollahi. "Nanocomposites." In Advanced Structured Materials, 65–115. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-00251-4_3.

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Cammarata, Robert C. "Nanocomposites." In Introduction to Nanoscale Science and Technology, 199–213. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/1-4020-7757-2_9.

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Padua, Graciela W., Panadda Nonthanum, and Amit Arora. "Nanocomposites." In Nanotechnology Research Methods for Foods and Bioproducts, 41–54. Oxford, UK: Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781118229347.ch4.

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Singh, N. B., and Saroj K. Shukla. "Nanocomposites." In 21st Century Nanoscience – A Handbook, 2–1. Boca Raton, Florida : CRC Press, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429351594-2.

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Gudapati, Vamshi, Gajendra Pandey, and Mehrdad N. Ghasemi Nejhad. "Nanocomposites." In Composites Innovation, 203–16. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003161738-16.

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Hasell, T. "METAL-POLYMER NANOCOMPOSITES BY SUPERCRITICAL FLUID PROCESSING." In Nanocomposites, 1–43. Hoboken, NJ: John Wiley & Sons, Inc, 2013. http://dx.doi.org/10.1002/9781118742655.ch1.

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Giannini, C., D. Siliqi, and D. Altamura. "NANOMATERIAL CHARACTERIZATION BY X-RAY SCATTERING TECHNIQUES." In Nanocomposites, 209–22. Hoboken, NJ: John Wiley & Sons, Inc, 2013. http://dx.doi.org/10.1002/9781118742655.ch10.

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Conference papers on the topic "Nanocomposites"

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Ghasemi-Nejhad, Mehrdad N., Anyuan Cao, Vinod Veedu, Davood Askari, and Vamshi Gudapati. "Nanocomposites and Hierarchical Nanocomposites Development at Hawaii Nanotechnology Laboratory." In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17053.

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This paper presents activities related to the development of nanocomposites and hierarchical nanocomposites; at the Hawaii Nanotechnology Laboratory of the Department of Mechanical Engineering of the University of Hawaii at Manoa. On nanocomposites, developments on toughening of polymeric materials employing nanoparticles and carbon nanotubes are reported. On hierarchical nanocomposites, first, mechanical properties improvements for continuous fiber ceramic composites using nanoparticles are discussed. Second, a multifunctional micro-brush using carbon nanotubes is discussed. Third, the structure of a micro-foam using carbon nanotubes is explained. Finally, the multifunctional properties improvement of a novel three-dimensional hierarchical nanocomposite employing carbon nanotubes is discussed. In closing, the effect of chirality of single-walled nanotubes on their thermomechanical properties evaluated analytically using asymptotic homogenization method and numerically employing finite element method will be explained, and analytical closed form solutions for matrix filled nanotube nanocomposites, also verified numerically, assuming generally cylindrical orthotropic properties will be reported.
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Chen, Chenggang. "Factors Influencing the Morphology Development of Epoxy Nanocomposites." In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17083.

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Polymer nanocomposites draw great interest due to their unique nanostructures and improved properties [1–2]. Epoxy is a widely-used thermosetting material. The research on the epoxy layered-silicate epoxy nanocomposite has exploded in the last decade [3–9]. The morphology of nanocomposites is the key to making high-performance nanocomposites. In this presentation, the factors influencing the morphology development behavior of epoxy nanocomposites will be discussed. The factors to be investigated include organoclay, epoxide, and curing agent. In this study, the aliphatic diamine (Jeffamines) with different molecular weights and aromatic diamine were selected as the curing agents, S30B (quaternary onium-montmorillonite) and SC18 (primary oniummont-morillonite) as the organoclays, and Epon 862 and Epon 828 as epoxides. In situ small-angle x-ray scattering (SAXS) was utilized to study the morphology development of the epoxy nanocomposite.
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Minnich, Austin, and Gang Chen. "Modeling the Thermoelectric Properties of Nanocomposites." In ASME 2008 3rd Energy Nanotechnology International Conference collocated with the Heat Transfer, Fluids Engineering, and Energy Sustainability Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/enic2008-53003.

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Modeling the thermoelectric properties of nanocomposites is difficult due to the complex grain boundary scattering processes which scatter both electrons and phonons. In this work we describe a code we developed which numerically calculates the electrical and thermal properties of bulk and nanocomposite thermoelectric materials using the Boltzmann equation under the relaxation time approximation. The code is capable of calculating all the relevant thermoelectric properties over a wide range of temperatures, doping concentrations, and compositions, allowing for a full characterization of the material. We model nanocomposites by incorporating a grain boundary scattering rate based on a simple model we developed and models in the literature. The code and grain boundary scattering models are validated on bulk data and data from nano-SiGe, and are then applied to other candidate thermoelectric materials to see if they would be good candidates for nanocomposites. The analysis shows that GaAs might be promising as a nanocomposite thermoelectric material.
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Qiao, Rui, and L. Cate Brinson. "Gradient Interphases in Polymer Nanocomposites." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12706.

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As revealed by experimental data on ultrathin polymer films [1, 2], polymer mobility changes in a gradient fashion away from the polymer-surface interface. However, little is yet known on gradients in mechanical properties in polymer nanocomposites. In this work, we discuss a novel nanoindentation experimental approach to measure these properties in model nanocomposite systems, the associated modeling to extract realistic data (Figure1), and simulations of representative volume elements (RVE) of nanocomposites including interphase layers (Figure2).
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Goh, C. S., J. Wei, and M. Gupta. "Characterization of Mg/MgO Nanocomposites Synthesized Using Powder Metallurgy Technique." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79872.

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Magnesium nanocomposites with 0.1, 0.2, 0.3 and 0.4 volume percentages of MgO were synthesized using the powder metallurgy technique. The nanocomposite billets obtained were subsequently hot extruded at a temperature of 350 °C with an extrusion ratio of 20.25:1. The extruded nanocomposites were characterized for their microstructural, physical and mechanical properties. The microstructures of the nanocomposites showed individual particles of MgO uniformly distributed in the magnesium matrix. The thermomechanical analysis results revealed that a more thermally stable magnesium nanocomposite could be obtained with a threshold amount of MgO. The tensile properties results indicated that the yield strength peaks at 0.3 vol.% of reinforcement incorporated, with an improvement of approximately 17%. An attempt is made to correlate the volume fraction of the MgO with the resultant physical and mechanical properties of the magnesium nanocomposites.
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Tiwari, Manish K., Alexander L. Yarin, and Constantine M. Megaridis. "Electrospun Nanocomposites as Flexible Sensors." In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72475.

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Electrospun polymer/nanoparticle composite-fiber strips are introduced as permeable, flexible strain sensors. The composite strips are referred as nanocomposite in this study. In the experiments with uniaxial elongation, the nanocomposite strips showed a reproducible increase in electrical resistance indicating the strain level. The resistance increase was interpreted with a novel percolation model that accommodated changing strips geometry. A theoretical framework for nanocomposites as possible detectors of local clogging in large-scale filters is also proposed.
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Shaito, Ali A., Nandika A. D'Souza, Debora Fairbrother, and Jerry Sterling. "Nonlinear Stress and Temperature Creep Relations in Polymer Nanocomposites." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16072.

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Stress and temperature response of Polyethylene (PE) nanocomposites is mapped and predicted using creep-recovery measurements. The results indicate that the PE nanocomposite exhibit nonlinear response. When montmorillonite layered silicates (MLS) are introduced into the polymer, the stress response deviates substantially. Recovery curves of the nanocomposites were lower than those of the creep response. Viscoplastic strain was lower in the case of the nanocomposites. The material responses are analyzed using mechanical analogs.
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Scarton, H. A., I. Kahn, M. A. Rafiee, J. Rafiee, K. Wilt, and N. Koratkar. "Evidence of Coulomb Friction Damping in Graphene Nanocomposites." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39378.

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Polymer nanocomposites reinforced by carbon nanotubes, fullerene and nanoparticles have been broadly studied within the last two decades. However, it was recently observed that polymer nanocomposites filled with graphene sheets showed exceptional mechanical and electrical properties. The advantage of graphene sheets over carbon nanotubes in nanocomposites may be related to their high specific surface area, enhanced nanofiller-matrix adhesion/interlocking arising from their wrinkled (rough) surface as well as the two-dimensional geometry of graphene sheets. We have compared the vibration damping properties of epoxy nanocomposite filled with single-walled carbon nanotubes (SWNT), multi-walled nanotubes (MWNT), and graphene platelet (GPL) fillers. Our results show the evidence of Coulomb friction damping in nanocomposites comparing with the pure epoxy.
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Jiang, Guo, and Hanxiong Huang. "Effect of Flow Field on Online Shear Viscosity of PP/nano-CaCO3 Composites." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15808.

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Polymer nanocomposites have been regarded as a new category of engineering materials and attracted technical and scientific interest. Recently rheological analysis became an effective tool for investigating the microstructures of nanocomposites. However, the online rheological property of nanocomposites during compounding was seldom studied. In this work, two types of screw configurations in twin-screw extruder were selected, one provides high shearing intensity and the other provides high shearing/mixing intensity. In addition, chaotic mixing was induced by installing a single screw extruder with a convective screw at the end of the twin-screw extruder to compound the nanocomposites. The online melt shear viscosity of nanocomposite was measured using Haake ProFlow online rheometer. Effects of high shearing, high shearing/mixing, and chaotic mixing on the online shear viscosity for polypropylene (PP)/nano-calcium carbonate (nano-CaCO3) composites were investigated. The study showed that the chaotic mixing facilitates the processing of the nanocomposite.
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MORA, ANGEL, CARLOS MEDINA, and FRANCIS AVILÉS. "A COMPUTATIONAL MODEL FOR THE PIEZORESISTIVE RESPONSE OF HYBRID CARBON NANOSTRUCTURED NETWORKS." In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35860.

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Carbon nanotubes (CNTs) and graphenic sheets (GSs) are commonly used fillers for polymer nanocomposites. These nanocomposites can be used as selfsensing materials (strain and damage sensors) due to their piezoresistive response. CNT/GS hybrid fillers could be used to tune the nanocomposite’s piezoresistive response. The piezoresistive response of polymers filled with hybrid carbon nanofillers is a novel topic being studied recently experimentally, and very few computational works are available. Thus, a computational model is developed to study the piezoresistive response of polymers filled with CNT/GS hybrid fillers, reproducing geometries and conditions similar to those used in experiments. This computational model generates a network of three dimensional (3D) representations of carbon nanostructures inside a cube, which represents the polymer matrix. The network of nanostructures is turned into a network of resistors to obtain the electrical conductivity of the cube, and thus the polymer nanocomposite. Mechanical strain is applied via coupling with a finite element software. To reduce computational time, embedded elements are used in the finite element simulations. Capabilities and limitations of the proposed computational model are explored.
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Reports on the topic "Nanocomposites"

1

Mackay, Michael E. Nanocomposites. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada597164.

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Boyle, Timothy J., Thu Q. Doan, Daniel T. Yonemoto, Sarah M. Hoppe, Christopher Alan Apblett, Gregory Von, II White, Nelson Simmons Bell, et al. Resposive nanocomposites. Office of Scientific and Technical Information (OSTI), September 2012. http://dx.doi.org/10.2172/1055915.

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Hyer, M. W. Workshop on Nanocomposites. Fort Belvoir, VA: Defense Technical Information Center, April 2004. http://dx.doi.org/10.21236/ada423417.

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Viehland, Dwight, and Shashank Priya. Mesoscale Design of Magnetoelectric Nanocomposites. Office of Scientific and Technical Information (OSTI), September 2016. http://dx.doi.org/10.2172/1322987.

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Bates, Frank S. Block Copolymer-Based Thermoset Nanocomposites. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada403744.

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Hahn, Thomas, J. Kim, G. Lu, V. Yong, and L. Viculis. Nanocomposites for Enhanced Structural Integrity. Fort Belvoir, VA: Defense Technical Information Center, August 2003. http://dx.doi.org/10.21236/ada430927.

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Mochrie, Simon G. J. Dynamics of Block Copolymer Nanocomposites. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1154906.

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Hahn, H. T. Nanocomposites for Enhanced Structural Integrity. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada472405.

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Shashank, Priya. Mesoscale Interfacial Dynamics in Magnetoelectric Nanocomposites. Office of Scientific and Technical Information (OSTI), December 2009. http://dx.doi.org/10.2172/1122549.

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Roytburd, Alexander L. Theory and Modeling of Adaptive Nanocomposites. Fort Belvoir, VA: Defense Technical Information Center, January 2004. http://dx.doi.org/10.21236/ada426904.

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