Articles de revues : « Inorganic Nano-particles »

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Kuroda, Akihiro, Kenji Sugibayashi, Hiroaki Todo, Kiminori Ito, Takashi Amemiya, Takashi Abe et Isoji Miyagi. « Natural-Origin Inorganic Nano-Particles ». Journal of Society of Cosmetic Chemists of Japan 51, n^o 4 (2017) : 317–25. http://dx.doi.org/10.5107/sccj.51.317.

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Hou, Jianfeng, et Haiwang Wang. « Synthesis and Characterization of Organic–Inorganic Complex ». Journal of Nanoelectronics and Optoelectronics 16, n^o 3 (1 mars 2021) : 466–70. http://dx.doi.org/10.1166/jno.2021.2947.

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An new method is described for fabricating BiFeO3@PVDF composites using sultraviolet light to motivate the surface electronic of BFO conduct reduction system. The synthesis scheme consists of: (a) preparation of BiFeO3 nano particles using Hydrothermal synthesis method. (b) oxidation of the PVDF powders in the effect of the mixed gas (ozone and dioxygen) and sultraviolet light. (c) redox reaction of the oxidated PVDF and BiFeO3 nano particles in the effect of sultraviolet light. The synthesized BiFeO3@PVDF composites show that this method could increase the compatibility between PVDF and BiFeO3 nano particles. Moreover, a formation mechanism for the composite is proposed.

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Cheng, Yujia, Guang Yu, Xiaohong Zhang et Boyang Yu. « The Research of Crystalline Morphology and Breakdown Characteristics of Polymer/Micro-Nano-Composites ». Materials 13, n^o 6 (21 mars 2020) : 1432. http://dx.doi.org/10.3390/ma13061432.

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In this article, low-density polyethylene (LDPE) was used as a matrix polymer, the Micro-ZnO and Nano-ZnO particles were used as the inorganic filler. With the melt blending method, the Nano-ZnO/LDPE(Nano-ZnO particles doping into LDPE), Micro-ZnO/LDPE(Micro-ZnO particles doping into LDPE) and Micro-Nano-ZnO/LDPE (Nano-ZnO and Micro-ZnO particles doping into LDPE in the same time) composites were prepared. Then, the inorganic filler and the composites were dealt with structural characterizations and analysis by Fourier transform infrared (FTIR), Polarization microscope (PLM), and Differential scanning calorimeter (DSC). Besides, these samples were dealt with (alternating current) AC breakdown performance test. The micro-experimental results showed that the Micro-ZnO and Nano-ZnO particles doping reduced the crystal size and increased the crystallization rate. With the change of cell structure, the crystallinity of composites increased. The crystallinity order of different samples was as follows: LDPE < Micro-ZnO/LDPE < Nano-ZnO/LDPE < Micro-Nano-ZnO/LDPE. From the breakdown of the experimental result, with the same mass fraction of the different inorganic doping of particles, the breakdown strength of these composites was different. The Nano-ZnO particle doping could improve the breakdown strength of composites effectively. Among them, the breakdown strength of Nano-ZnO/LDPE and Micro-Nano-ZnO/LDPE were 11% higher and 1.3% lower than that of pure LDPE, respectively. Meanwhile, the breakdown strength of Micro-composite was the lowest but its Weibull shape coefficient was the highest. Therefore, the Micro-ZnO doping was helpful for the Nano-ZnO dispersing in the matrix, which produced the Micro-Nano-synergy effects better.

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Cheng, Yujia, et Guang Yu. « The Research of Interface Microdomain and Corona-Resistance Characteristics of Micro-Nano-ZnO/LDPE ». Polymers 12, n^o 3 (4 mars 2020) : 563. http://dx.doi.org/10.3390/polym12030563.

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In this article, the melting blend was used to prepare the Micro-ZnO/LDPE, Nano-ZnO/LDPE and Micro-Nano-ZnO/LDPE with different inorganic particles contents. The effect of Micro-ZnO and Nano-ZnO particles doping on interface microdomain and corona-resistance breakdown characteristics of LDPE composite could be explored. Based on the energy transfer and heat exchange theory of energetic electrons, the inner electrons energy transfer model of different ZnO/LDPE composites was built. Besides, the microstructure and crystalline morphology of inorganic ZnO-particles and polymer composites were detected by SEM, XRD, FTIR, PLM and DSC test, and the AC breakdown and corona-resistance breakdown characteristics of composites could be explored. From the experimental results, the Nano-ZnO particles after surface modification dispersed uniformly in LDPE matrix, and the nanoparticles agglomeration almost disappeared. The inorganic particles doping acted as the heterogeneous nucleation agent, which improved the crystallization rate and crystallinity of polymer composites effectively. The ZnO particles with different size doping constituted the different interface structure and crystalline morphology, which made different influence on composites macroscopic properties. When the Nano-ZnO particle size was 40nm and the mass fraction was 3%, the breakdown field strength of Nano-ZnO/LPDE was the highest and 15.8% higher than which of pure LDPE. At the same time, the shape parameter β of Micro-Nano-composite was the largest. It illustrated the microparticles doping reduced the probability of nanoparticles agglomeration in matrix. Besides, both Micro-ZnO and Micro-Nano-ZnO particles doping could improve the ability of corona corrosion resistance of LDPE in varying degrees. The corona-resistant breakdown time order of four samples was as follows: LDPE < Micro-ZnO/LDPE < Nano-ZnO/LDPE < Micro-Nano-ZnO/LDPE. When the mass fraction of Micro-ZnO and Nano-ZnO particles was 2% and 3% respectively, the corrosion depth and area of Micro-Nano-ZnO/LDPE was the least, and the ability of corona corrosion resistance was the strongest.

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Gupta, Nishu, et K. M. Gupta. « Emerging Scope of Hybrid Solar Cells in Organic Photovoltaic Applications by Incorporating Nanomaterials ». Advanced Materials Research 548 (juillet 2012) : 143–46. http://dx.doi.org/10.4028/www.scientific.net/amr.548.143.

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In recent years, semiconductor nanomaterials have been extensively studied and reports are available for their preparation methods, physical and chemical properties of nanoparticles and their characterization techniques. Because of their potential applications, ZnS nanoparticles are recently major area of research. It is an important inorganic material for a variety of applications including photoconductors, solar cells, field effect transistors, sensors, transducers optical coatings and light-emitting materials. Inorganic nano-particles have found potential application in various electronic devices. Synthesis, shape and size control are important issues for nano-particles research. Various nano-structured materials have found potential applications in optical and electrical devices such as photoconductors, LEDs, solar cells, field effect transistors, optical coatings etc. ZnS has wide band gap ranging from 3.5 to 3.8 eV at room temperature and the band gap can be tuned in the UV region by controlling the size of the nano-particles. In the present work we have studied the synthesis of ZnS nano-particles, their characterization to investigate various properties such as size, structure, band gap and luminescence via different characterization tools. The particles were then used as acceptors for fabrication of organic hybrid solar cells.

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Wang, Huan, Xiao Jin et Jian Wei Cui. « Study of Organic/Inorganic Hybrid Nanoparticles in Sizing Agents for Mechanism and Effect of Fiber Adhesion ». Advanced Materials Research 821-822 (septembre 2013) : 511–17. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.511.

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This paper stated the preparation of nano-modified polyacrylic acid sizing agents by adding self-made hybridized nano-TiO2(titanium dioxide)/PSt(Polystyrene) and nano-SiO2(silica dioxide)/PSt emulsion respectively into self-made polyacrylic acid sizing agents which called SW. Influences of two kinds of nano hybrid particles in nano-modified SW with different dosages on the strength of sizing yarns and mechanisms of increasing adhesion were analyzed. Experimental results showed that: 1. when two kinds of nano particles’ weight was about 1.1% of SW solid content, adhesion force of nano-modified sizing agents with Terylene/Cotton(T/C)fibers will reach the maximum,while when the weight of nano particles were less than 1.1% or more than 1.1%, the adhesion force between sizes and (T/C)fibers increased obviously or declined evidently; 2. scanning electronic microscope(SEM) photograph of roving chips displayed that fibers’ surface were completely covered by smooth size film and many hybrid nanoparticles between macromolecules of sizes, thus engendering huge bonding force between sizes and fibers, and increasing the slip resistance between fibers.

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Wang, Jian, Wenjie Zhang, Yating Zhang et Haolin Li. « Preparation of Polymer-Based Nano-Assembled Particles with Fe3O4 in the Core ». Polymers 15, n^o 11 (29 mai 2023) : 2498. http://dx.doi.org/10.3390/polym15112498.

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Organic–inorganic nanocomposite particles, possessing defined morphologies, represent the next frontier in advanced materials due to their superior collective performance. In this pursuit of efficient preparation of composite nanoparticles, a series of diblock polymers polystyrene-block-poly(tert-butyl acrylate) (PS-b-PtBA) were initially synthesized using the Living Anionic Polymerization-Induced Self-Assembly (LAP PISA) technique. Subsequently, the tert-butyl group on the tert-butyl acrylate (tBA) monomer unit in the diblock copolymer, yielded from the LAP PISA process, was subjected to hydrolysis using trifluoroacetic acid (CF3COOH), transforming it into carboxyl groups. This resulted in the formation of polystyrene-block-poly(acrylic acid) (PS-b-PAA) nano-self-assembled particles of various morphologies. The pre-hydrolysis diblock copolymer PS-b-PtBA produced nano-self-assembled particles of irregular shapes, whereas post-hydrolysis regular spherical and worm-like nano-self-assembled particles were generated. Utilizing PS-b-PAA nano-self-assembled particles that containing carboxyl groups as polymer templates, Fe3O4 was integrated into the core region of the nano-self-assembled particles. This was achieved based on the complexation between the carboxyl groups on the PAA segments and the metal precursors, facilitating the successful synthesis of organic–inorganic composite nanoparticles with Fe3O4 as the core and PS as the shell. These magnetic nanoparticles hold potential applications as functional fillers in the plastic and rubber sectors.

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Yang, Ming Shan, et Ying Quan. « Surface Encapsulation of Nano-CaCO₃ Particle by In Situ Emulsion Polymerization ». Advanced Materials Research 58 (octobre 2008) : 163–67. http://dx.doi.org/10.4028/www.scientific.net/amr.58.163.

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The nano-CaCO3/polyacrylate core-shell inorganic-organic complex nano-particles were prepared by in situ emulsion polymerization based on fresh slush pulp of calcium carbonate (CaCO3) nanoparticles in this paper. The dispersion and encapsulation of nanoparticles were investigated by transmission electron microscopy (TEM) and electron spectroscopy for chemical analysis(ESCA). The results showed that in the presence of nano-CaCO3 particles, the in situ emulsion polymerization of acrylates was carried out smoothly, and polyacrylates successfully encapsulated on the surface of nano-CaCO3.

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WANG, WEI, JIACHENG GAO, YONG WANG et JIAN ZHOU. « PREPARATION OF VANADIUM CATALYST CONTAINING NANO-V2O5 PARTICLES ». International Journal of Modern Physics B 19, n^o 01n03 (30 janvier 2005) : 659–62. http://dx.doi.org/10.1142/s0217979205029262.

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A new preparation process of the vanadium catalyst with nano- V 2 O 5 particles was introduced in this paper. The inorganic sol-gel method is used to prepare the sols and gels with p nano- V 2 O 5 particles. The morphology, size and distribution of the nano- V 2 O 5 particles in the sols-gels and vanadium catalyst had been studied by TEM, SEM, XRD and DSC. The results show that with the w/v (the ratio of water and vanadium) declining, the morphology of the nano- V 2 O 5 particles varies from needle to near-ball then to sphere; the better process parameter to prepare the sols and gels with nano- V 2 O 5 particles is 800~860°C×10~15min; the sols and gels and catalyst with 30~60nm V 2 O 5 particles had been obtained by this process.

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Cheng, Yujia, Guang Yu, Boyang Yu et Xiaohong Zhang. « The Research of Conductivity and Dielectric Properties of ZnO/LDPE Composites with Different Particles Size ». Materials 13, n^o 18 (17 septembre 2020) : 4136. http://dx.doi.org/10.3390/ma13184136.

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Nanocomposites exhibit a high dielectric strength, whereas microcomposites exhibit a high thermal conductivity. In this study, good insulating materials were developed on the basis of the synergetic effect of micro- and nanoparticles, which were used as inorganic fillers. With a double-melting blend, nano-ZnO/low density polyethylene (LDPE), micro-ZnO/LDPE, and micro-nano-ZnO/LDPE composites were prepared, according to the scanning electron microscope test, polarization microscope test, conductivity test, breakdown test, and dielectric spectrum test, the dielectric property of micro-nano-ZnO/LDPE was explored. The SEM test results showed that by adding a suitable proportion of ZnO particles, the inorganic particles could disperse uniformly without reuniting. The PLM test results showed that the micro- and nano-ZnO particles adding decreased the crystal size. The arrangement was regular and tight. The macroscopic results showed that the mass fraction of nanoparticles and microparticles were 3% and 2%, the samples conductivity was the lowest. The breakdown field strength of the nanocomposites increased. The breakdown field strength of nanocomposites with 1%, 3%, and 5% nanoparticle contents were 5%, 15%, and 10% higher than that of pure LDPE. The addition of inorganic particles resulted in new polarization modes: Ionic displacement polarization and interfacial polarization. The ZnO/LDPE composites exhibited a higher dielectric constant and dielectric loss factor than pure LDPE. However, with the increasing frequency, it took considerable time to attain interfacial polarization in the nanocomposite and micro-nanocomposite, thus decreasing the dielectric constant.

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Liu, Li Zhu, Ling Weng, Hui Shi, Feng Chun Wang, Jun Ding et Qing Quan Lei. « The Effect of Nano-Aluminum on Morphology and Properties of Polyimide Matrix Composites ». Advanced Materials Research 476-478 (février 2012) : 551–54. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.551.

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Nano-sized Al2O3/polyimide composite films based on Pyromellitic dianhydride(PMDA) and 4,4’-Oxydianiline(ODA) were synthesized by addition with different contents of nano-sized Al2O3 via in situ polymerization. Before addition, nano-Al2O3 particles were firstly modified by coupling agent DB550. The morphology, structure and properties including the mechanical and electrical properties were investigated. SEM microstructures analysis result indicated that the inorganic particles were homogenously dispersed in the polyimide matrix by means of the ultrasonic-mechanical method and the treatment of coupling agent DB550. XRD analysis showed that the addition of nano Al2O3 particles destroyed the molecular order of the PI matrix. Moreover, with the increased in Al2O3 content, the weaken effect on the molecular order also increased. The mechanical property decreased with the increase of Al2O3 content. Better electric breakdown strength could be achieved if the pure polyimide films were incorporated with nano-Al2O3 particles.

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Shimpi, N. G., R. U. Kakade, S. S. Sonawane, A. D. Mali et S. Mishra. « Influence of Nano-Inorganic Particles on Properties of Epoxy Nanocomposites ». Polymer-Plastics Technology and Engineering 50, n^o 8 (mai 2011) : 758–61. http://dx.doi.org/10.1080/03602559.2010.551437.

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Liu, Fan, Xian Tao Tao, Lin Yang, Ping Liu et Kai Zhou. « XLPE Cable Insulation Enhancement Mechanism Based on Isopropoxide Catalyzed Siloxane ». Advanced Materials Research 554-556 (juillet 2012) : 277–81. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.277.

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In this paper, needle-shape insulation defect was made in XLPE cable samples. With high-voltage and high-frequency accelerated aging, water tree was formed inside XLPE layer. One group of the samples was injected siloxane catalyzed by isopropoxide for rejuvenation, and the breakdown voltage was significantly greater than new samples. Nano-inorganic particles were observed by scanning electron microscope (SEM) inside the breakdown channels of rejuvenated samples. The insulation enhancement mechanism is described in this paper based on the new discovery, that the insulating property of cables is enhanced by the nano-inorganic particles, because of its ability to inhibit the partial discharge damage inside the water tree channel.

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Zheng, Hua De, Ying Jun Wang, Chun Rong Yang, Xiao Feng Chen et Na Ru Zhao. « Investigation on the Porous Biomaterial for Bone Reconstruction with Addition of Bio-Mimetic Nano-Sized Inorganic Particles ». Key Engineering Materials 336-338 (avril 2007) : 1534–37. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1534.

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The spherical nano-sized bioactive particles in the system of CaO-P2O5-SiO2 were bio-mimetically synthesized using micro-emulsion method. The microstructures and properties of the bio- mimetic nano-materials were characterized using XRD, FTIR, SEM/EDAX and TEM techniques. It was indicated that the nano-particles possessed glassy structural characteristics. The porous composite for bone tissue reconstruction was prepared by compounding poly (hydroxybutyrate-2-co-2-hydroxyvalerate) (PHBV) and the nano-particles of bio-mimetic bioactive glasses (BMBG). Bone-like hydroxyl- carbonate-apatite (HCA) could formed on the surface of porous composite by immersing the composite in simulated body fluid (SBF) at 37°C for 8 hours. With increase of immersion time, the morphology of HCA changed from spherical into flake-like crystals. The study on cells attachment of the porous PHBV/BMBG composite proved that the material possessed satisfactory bioactivity, bio-mineralization function and cells biocompatibility.

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Patel, Siddhant B., Amar H. Patel et Jignasa V. Gohel. « A novel and cost effective CZTS hole transport material applied in perovskite solar cells ». CrystEngComm 20, n^o 47 (2018) : 7677–87. http://dx.doi.org/10.1039/c8ce01337c.

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Cho, In Churl, Yong Kap Park et Yong Choi. « Light Conversion by Size Control of Inorganic Phosphors ». Materials Science Forum 620-622 (avril 2009) : 699–702. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.699.

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A unique method, so called, hydro-thermal synthetic method was applied to produce nano-sized inorganic blue (Y2SiO5:Ce) and red (Y2O2S:Eu+3) emitting phosphors. Electron microscopy revealed that the nano-sized emitting phosphor particles have spherical shape with 23-50nm in size. The particles can effectively change ultraviolet rays of 1-390 nm to infrared rays of 750nm -1mm, which are suitable to promote the growth of plants. The principle excitation and emitting spectrum of the red phosphor in 590-700 nm emitting spectrum were in the region of 308nm and 617nm, respectively, whereas, those of the blue phosphor in 420-470nm emitting spectrum were in the region of 254nm and 464nm, respectively. The addition of 0.1-0.2 wt% of the 2:1 mixed red and blue powders to a film showed the maximum emitting intensity of 537x1000 count/sec.

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Yu, Guang, et Yujia Cheng. « Effects of Inorganic ZnO Particle Doping on Crystalline Polymer Morphology and Space Charge Behavior ». Coatings 10, n^o 10 (29 septembre 2020) : 932. http://dx.doi.org/10.3390/coatings10100932.

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This study further investigated the synergistic effect of micro- and nanofiller doping on matrix material space charges and breakdown characteristics. Accordingly, low-density polyethylene (LDPE) was used as the matrix material, and spherical ZnO particles with sizes of 30 nm and 1 µm were used as additives. Micro-ZnO/LDPE, nano-ZnO/LDPE, and micro-nano-ZnO/LDPE composites were prepared through melt blending. The crystalline morphologies of the composites were observed via polarized light microscopy. The composite crystallinity and melting peak temperature were measured via differential scanning calorimetry, and the micro- and nanoparticle dispersions in the matrix were observed via scanning electron microscopy. The test results showed that the particles were uniformly dispersed in the polyethylene matrix. The filler acted as a heterogeneous nucleation agent in the matrix. The crystal size decreased, thereby increasing the crystal quantity. The doping of inorganic ZnO particles improved the composite crystallinity. The ZnO/LDPE composites were subjected to DC breakdown, space charge, and dielectric spectrum tests. When the crystal arrangement of the sample was loose and its size was large, the breakdown process developed along a shorter path, and the field strength of the composite breakdown decreased. The order of AC and DC breakdown field strengths of the samples was as follows: micro-ZnO/LDPE < pure LDPE < micro-nano-ZnO/LDPE < nano-ZnO/LDPE. The DC and AC breakdown field strengths of the micro- and nano-ZnO/LDPE were 4.7% and 3.2% higher than those of the pure LDPE, respectively. Moreover, the DC and AC breakdown field strengths of the nano-ZnO/LDPE were 11.02% and 15.8% higher than those of the pure LDPE, respectively. The doping of inorganic ZnO particles restrained the space charge accumulation, and the residual charges decreased after short-circuit treatment. The dielectric constant of all nanocomposites was lower than that of LDPE, and the dielectric loss of all composites was higher than that of LDPE.

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Hu, Haitao, Xiaohong Zhang, Dingping Zhang, Junguo Gao, Chunxiu Hu et Yayun Wang. « Study on the Nonlinear Conductivity of SiC/ZnO/Epoxy Resin Micro- and Nanocomposite Materials ». Materials 12, n^o 5 (5 mars 2019) : 761. http://dx.doi.org/10.3390/ma12050761.

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To investigate the inhomogeneous distribution of electric fields in insulating equipment and components, five nonlinear-conductance composite materials based on epoxy resin (EP) (nano-SiC/EP, nano-ZnO/EP, micro-ZnO/EP, nano-SiC/ZnO/EP, and nano-micro-SiC/ZnO/EP), were prepared using nano-SiC, nano-ZnO, and micro-ZnO particles as fillers. The mass fractions of the inorganic fillers were 1, 3, and 5 wt%, respectively. The direct current (DC) voltage characteristics of the composites showed that the electrical conductivities and nonlinear coefficients of the composites utilizing single-filler types increased with increasing inorganic filler content. Under the same conditions, the conductivity and nonlinear coefficient of SiC/EP were both larger than those of the nano-ZnO/EP and micro-ZnO/EP. However, the nonlinear coefficient of the composites was significantly affected by the simultaneous addition of the two inorganic fillers, micro-ZnO and nano-SiC. When the content ratio of micro-ZnO to nano-SiC was 2:3, the nonlinear coefficient of the composite reached a maximum value of 3.506, significantly higher than those of the other samples. Compared with the nano-SiC/EP, micro-ZnO/EP and nano-ZnO/EP composites with 5 wt% inorganic filler, the nonlinear coefficient of the two-filler composite was greater by a factor of 0.82, 2.48, and 5.01, respectively.

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Peng, Ying, Jian Hua Liu et Xun Pu Hu. « Micro-Mechanics of UPR Composite Toughened by Rigid Nano-Particles ». Advanced Materials Research 168-170 (décembre 2010) : 1675–79. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1675.

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The toughening for UPR composite effect of rigid nano-particles was studied. By the tensile test, it was confirmed that with the increase of the organic rigid particle PA6 and inorganic rigid nano-particles SiO2，toughening effect for the UPR was better. The Generalized Method Cell of the micro-mechanical constitutive of the rigid particles and UPR phase was established. The macro- plastic deformation was simulated by the correlation of parameters for micro-mechanical and macroscopic mechanical, the simulation curves were well fit with its experimental curves。The numerical results indicate that the nonlinear theoretical method can simulate the plastic strain curves of composite well.

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Abe, Shigeaki, Nobuki Iwadera, Mitsue Esaki, Ikuhiro Kida, Mami Mutoh, Tsukasa Akasaka, Motohiro Uo et al. « Internal distribution of micro- / nano-sized inorganic particles and their cytocompatibility ». IOP Conference Series : Materials Science and Engineering 18, n^o 19 (8 juillet 2011) : 192013. http://dx.doi.org/10.1088/1757-899x/18/19/192013.

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Yang, Rui, Ying Li et Jian Yu. « Photo-stabilization of linear low density polyethylene by inorganic nano-particles ». Polymer Degradation and Stability 88, n^o 2 (mai 2005) : 168–74. http://dx.doi.org/10.1016/j.polymdegradstab.2003.12.005.

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Xing, Y. « Synthesis and restructuring of inorganic nano-particles in counterflow diffusion flames ». Combustion and Flame 107, n^o 1-2 (octobre 1996) : 85–102. http://dx.doi.org/10.1016/0010-2180(96)00005-3.

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Yang, Baohong, Yongping Bai et Yingjie Cao. « Effects of inorganic nano-particles on plasticizers migration of flexible PVC ». Journal of Applied Polymer Science 115, n^o 4 (15 février 2010) : 2178–82. http://dx.doi.org/10.1002/app.31310.

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Khanjani, Somayeh, et Ali Morsali. « A new nano-particles LaIII compound as a precursor for preparation of La2O2(SO4) nano-particles ». Journal of Molecular Structure 935, n^o 1-3 (octobre 2009) : 27–31. http://dx.doi.org/10.1016/j.molstruc.2009.06.035.

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Li, Xi Hong, Yao Xiao, Biao Wang, Ya Qing Lu, Yao Tang et Cheng Jun Wang. « Effects of Nano-Particles on Resistance of DOP Migration from Flexible PVC ». Advanced Materials Research 160-162 (novembre 2010) : 401–6. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.401.

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The effects of nano-particles (CaCO3, SiO2 and organic modified montmorillonite (OMMT) on the suppression of DOP migration from PVC matrix and mechanical properties of PVC composites were evaluated. The results indicated that the three kinds of nano-particles could improve the ability of anti-migration of DOP in flexible PVC. A certain content of nano-particle could decrease the migration rate of DOP. The addition of 5 phr SiO2 decreased the extraction rate of DOP to 15.6%, and SiO2-5/PVC composite film possessed superior anti-extraction property. The introduction of 5 phr OMMT reduced the volatilization of DOP to 0.067%, and OMMT-5/PVC exhibited the lowest volatilization of DOP. Inorganic nano-particles with high surface energy were easy to aggregate, and the influences of aggregation on the properties of composites were clearly detrimental, which results in a drastic decrease of polymer anti-migration and mechanical performance.

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Lin, Jia Qi, Jun Hui Shi et Chen Wang. « Nano Inorganic Particles to the Doping and Influence of Polyimide Electric Breakdown ». Applied Mechanics and Materials 44-47 (décembre 2010) : 2637–41. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.2637.

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This page is about the preparation of inorganic nanoparticle polyimide films by in-situ. Through this kind of doping, that changed the physical and chemical properties of polyimide. Experimental film by infrared, ultraviolet, SEM, electrical breakdown experiments, the surface resistivity, volume resistivity, and electrolum- inescent. The results show that the polyimide/ZnO films preparation by this kind of doping, hybrid inorganic nano-particles can reduce polyimide electrical breakdown field, the surface resistivity, volume resistivity, electroluminescent. It testified by electroluminescent show that the electroluminescent position from 561.8nm to 609.4nm. The redshift phenomenon occurs show that the apparent on polyimide trap turn lighter.

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He, Jian Yun, Jin Ping Xiong et Bing Qian Xia. « UV-Curable Organic-Inorganic Hybrid Films Based on Epoxynorbornene Linseed Oils ». Advanced Materials Research 217-218 (mars 2011) : 294–99. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.294.

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Epoxynorbornene linseed oil (ENLO) is a new kind of epoxide from renewable sources. An UV-curable organic/inorganic hybrid films using epoxynorbornene linseed oils (ENLO) and surface treated nano-silica were formulated. The mechanical properties，thermal properties and coating properties of the ENLO /silica coatings were evaluated as the function of nano-silica content. The results indicated that after incorporating the nano-silica, the strength, modulus and glass transition temperature of the hybrid films enhanced, while the elongation at break decreased. The nano-silica also improved the hybrid coating properties such as pencil hardness, solvent resistance and surface wetting properties. The morphology observation of the films by atomic force microscopy (AFM) showed that the average silica particle size was ~ 70 nm and the particles were well-dispersed in the organic phase.

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Han, Youn Gyu, Tomonori Shibata, Rajagopalan Ramaseshan, Tohru Sekino et Koichi Niihara. « Fabrication and Evaluation of the Novel Elastomer Based Nanocomposite with Pressure Sensing Function ». Materials Science Forum 544-545 (mai 2007) : 741–44. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.741.

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A novel organic/inorganic composite material which can work as a pressure sensor has been synthesized. This composite basically contains nano-sized carbon particles as conductive filler into an elastomer matrix to achieve pressure sensitive function. The superior pressure sensitive effect was showed at 0.88vol% of carbon particles while in the previous study the micro-sized carbon particle was required above 30vol%. In addition, nano-sized silica particles were added to reinforce electrical insulation properties and to improve the pressure sensing reliability of the composite. The addition of the surface modified silica improved better both the sensing performance and the mechanical strength than the composite containing non-modified silica particles. These polymer-based sensors have economical advantage due to low cost production regardless of the high performance.

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Khan, Muhammad Junaid, Amina Ashfaq, Yahya Khan, Bibi Zainab, Kinza Bashir, Shahid Nazeer, Asia Bibi, Muhammad Alamgeer et Muhammad Sheeraz Javed. « Nanochemistry : A Multidisplinary Approach towards Innovations in Agriculture Soils and Improved Yields ». Haya : The Saudi Journal of Life Sciences 7, n^o 11 (14 novembre 2022) : 323–28. http://dx.doi.org/10.36348/sjls.2022.v07i11.004.

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Agriculture has made significant strides recently, and sustainability build on those successes by using a smart strategy that may maintain greater returns and farm profitability without depleting the resources. Furthermore, nano-materials enhance the efficiency of farm production to enable site targeted regulated distribution of minerals, assuring the least amount of agri-input usage while enhancing crop output. Particularly in the agriculture industry, nanoscienceis crucial for agricultural production, food packaging and processing, water purification, nutrition security, and pollution control as well as crop development and plant preservation. NPs display a well-organized antibacterial activity towards bacteria and viruses. Important inorganic NPs with effective pesticide characteristics include silver, aluminum and copper. Chitosan nano-particles, ZnO nano-particles, and silica nano-particles are beneficial for the treatment of virus infection, including the mosaic virus in tobacco, potatoes, and alfalfa. The revitalization of the damaged soil resources may be possible using nano-enabled soil rehabilitation. The toxicity copper in soil is typically linked to soluble free metal ion species like Cu2+, that are easily accessible and extremely hazardous, in traditional forms of higher soil.

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Zhang, Jing Yong, Dong Li Li, Wen Cai Xu et Ya Bo Fu. « Influence of Free Volume on Residual Solvents of SiO₂ Modified Polypropylene Films ». Applied Mechanics and Materials 477-478 (décembre 2013) : 1234–37. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.1234.

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Nano inorganic particles, as a kind of rigid inorganic particles, can combine the characteristics of organic polymers and inorganic to obtain the composite materials with excellent comprehensive properties. In this thesis, nanosilica after surface modification was used as the modified agent, adding to polypropylene materials to get a series of polypropylene films with different content of nanosilica. Free volume characterizations of different polypropylene films were measured using the positron annihilation lifetime spectroscopy technique, and the residual solvents values were measured. Researches show that the free volume of polypropylene films changes result from the changes of nanosilica content. With the free volume of polypropylene films decreases, the residual solvents values become lower.

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Yang, Weizhong, Yong Yi, Yuan Ma, Li Zhang, Jianwen Gu et Dali Zhou. « Preparation and characterization of nano biphasic calcium phosphate/poly-L-lactide composite scaffold ». Science and Engineering of Composite Materials 23, n^o 1 (1 janvier 2016) : 37–44. http://dx.doi.org/10.1515/secm-2014-0100.

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AbstractNano biphasic calcium phosphate (BCP) particles were synthesized using the sol-gel method. As-prepared BCP particles were combined with poly-L-lactide (PLLA) to fabricate nano-BCP/PLLA composite scaffold through a series of processing steps containing solvent self-diffusion, hot-pressing, and particulate leaching. The composite had a suitable porous structure for bone tissue engineering scaffold. In comparison, micro-BCP/PLLA scaffold was studied as well. Nano-BCP particles were distributed homogeneously in the PLLA matrix, and much more tiny crystallites exposed on the surface of the pore wall. Due to the finer inorganic particle distribution in the PLLA phase and the larger area of the bioactive phase exposed in the pore wall surface, nano-BCP/PLLA scaffold had enhanced compressive strength, good bioactivity, and superior cell viability. A nonstoichiometric apatite layer could be rapidly formed on the surface of nano- BCP/PLLA when soaked in simulated body fluid. The MG-63 cell viability of nano-BCP/PLLA scaffold is significantly higher than that of micro-BCP/PLLA scaffold. Therefore, nano-BCP/PLLA composite may be a suitable alternative for bone tissue engineering scaffold.

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Klemenz, S., M. Fries, M. Dürrschnabel, K. Skokov, H. J. Kleebe, O. Gutfleisch et B. Albert. « Low-temperature synthesis of nanoscale ferromagnetic α′-MnB ». Dalton Transactions 49, n^o 1 (2020) : 131–35. http://dx.doi.org/10.1039/c9dt03842f.

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Wang, Ping, Shao Hua Zheng, Yan Sheng Yin et Deng Cheng Su. « Preparation and Properties of Nano-Inorganic Mineral Material as Lubricating Oil Additive ». Advanced Materials Research 79-82 (août 2009) : 1847–50. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1847.

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In this paper, a 20nm inorganic mineral particles, mainly includes Mg3Si2O5(OH)4, KAlSiO4 and CaMg(CO3)2, were prepared by the ultrasonic nanometer grinder. As a lubricating oil additive, the dispersion property of the particles was characterized and the tribological properties were evaluated. The antiwear mechanism was investigated with SEM, EDS and XRD. Results show the inorganic nano-mineral material as an oil additive has excellent stable-dispersion property. The load-carrying capacity and antiwear property of the base oil were improved greatly. It can be inferred that the additive creates certain deposit on the friction surface. The physical-chemical deposition could not only bear the load but also prevent forming direct contact of two rubbing surface. 0.5wt% is the optimal additive concentration.

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Li, Chun, Xin Wang, Zi Jiao, Yu Zhang, Xiang Yin, Xue Cui et Yue Wei. « Functionalized Porous Silica-Based Nano/Micro Particles for Environmental Remediation of Hazard Ions ». Nanomaterials 9, n^o 2 (12 février 2019) : 247. http://dx.doi.org/10.3390/nano9020247.

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The adsorption and separation of hazard metal ions, radioactive nuclides, or minor actinides from wastewater and high-level radioactive waste liquids using functional silica-based nano/micro-particles modified with various inorganic materials or organic groups, has attracted significant attention since the discovery of ordered mesoporous silica-based substrates. Focusing on inorganic and organic modified materials, the synthesis methods and sorption performances for specific ions in aqueous solutions are summarized in this review. Three modification methods for silica-based particles, the direct synthesis method, wetness impregnation method, and layer-by-layer (LBL) deposition, are usually adopted to load inorganic material onto silica-based particles, while the wetness impregnation method is currently used for the preparation of functional silica-based particles modified with organic groups. Generally, the specific synthesis method is employed based on the properties of the loading materials and the silicon-based substrate. Adsorption of specific toxic ions onto modified silica-based particles depends on the properties of the loaded material. The silicon matrix only changes the thermodynamic and mechanical properties of the material, such as the abrasive resistance, dispersibility, and radiation resistance. In this paper, inorganic loads, such as metal phosphates, molybdophosphate, titanate-based materials, and hydrotalcite, in addition to organic loads, such as 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-Calix{4}arene (Calix {4}) arene-R14 and functional 2,6-bis-(5,6-dialkyl-1,2,4-triazin-3-yl)-pyridines(BTP) are reviewed. More specifically, we emphasize on the synthesis methods of such materials, their structures in relation to their capacities, their selectivities for trapping specific ions from either single or multi-component aqueous solutions, and the possible retention mechanisms. Potential candidates for remediation uses are selected based on their sorption capacities and distribution coefficients for target cations and the pH window for an optimum cation capture.

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Bae, Sang-U., et Birm-June Kim. « Effects of Cellulose Nanocrystal and Inorganic Nanofillers on the Morphological and Mechanical Properties of Digital Light Processing (DLP) 3D-Printed Photopolymer Composites ». Applied Sciences 11, n^o 15 (25 juillet 2021) : 6835. http://dx.doi.org/10.3390/app11156835.

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Photopolymer composites filled with cellulose nanocrystal (CNC) and/or inorganic nanofillers were fabricated by using digital light processing (DLP) 3D printing. To investigate the effects of different CNC lyophilization concentrations and behaviors of CNC particles in the photopolymer composites, morphological and mechanical properties were analyzed. CNC loading levels affected the morphological and mechanical properties of the filled composites. Better CNC dispersion was seen at a lower lyophilization concentration, and the highest mechanical strength was observed in the 0.25 wt% CNC-filled composite. Furthermore, nano-precipitated calcium carbonate (nano-PCC) and nanoclay were added to photocurable resins, and then the effect of inorganic nanofillers on the morphological and mechanical properties of the composites were evaluated. By analyzing the morphological properties, the stress transfer mechanism of nano-PCC and nanoclay in the photopolymer composites was identified and related models were presented. These supported the improved mechanical strength of the composites filled with CNC, nano-PCC, and nanoclay. This study suggested a new approach using wood-derived cellulose nanomaterials and inorganic nanofillers as effective fillers for DLP 3D printing.

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Luo, Jian Hui, Yuan Yang Li, Ping Mei Wang, Bi Bo Xia, Li Peng He, Bo Wen Yang et Bo Jiang. « A Facial Route for Preparation of Hydrophobic Nano-Silica Modified by Silane Coupling Agents ». Key Engineering Materials 727 (janvier 2017) : 353–58. http://dx.doi.org/10.4028/www.scientific.net/kem.727.353.

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Nano-silica was prepared using tetraethylorthosilicate (TEOS) as precursor by sol-gel technology based on stÖber method. These silica nanoparticals were further modified with silane coupling agents, i.e., Hexadecyltrimethoxysilane (HDTMS), dimethoxydiphenylsilane (DMMPS), to introduce organic functional groups on the surface of SiO2 nanoparticles. The Fourier transform-infrared (FTIR) spectra indicated that these silane coupling agents were anchored on the surface of silica particles. And the obtained organic–inorganic hybrid SiO2 particles showed an improvement in hydrophobicity, which can effectively inhibit these silica particles from aggregating.

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Lousada, Cláudio M., Ricardo M. F. Fernandes, Nadezda V. Tarakina et Inna L. Soroka. « Synthesis of copper hydride (CuH) from CuCO3·Cu(OH)2 – a path to electrically conductive thin films of Cu ». Dalton Transactions 46, n^o 20 (2017) : 6533–43. http://dx.doi.org/10.1039/c7dt00511c.

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Picanço, Wagner M., Bianca de A. Feitosa, Noam G. da Silva, Greta T. A. Silva, Virgínia M. Giacon, Pedro H. Campelo, Sérgio M. de Souza, Kelson M. T. de Oliveira et Edgar A. Sanches. « Aniline-oriented polymerization over nano-SiO2 particles ». Journal of Molecular Structure 1167 (septembre 2018) : 118–26. http://dx.doi.org/10.1016/j.molstruc.2018.04.087.

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Kontkanen, Jenni, Tinja Olenius, Markku Kulmala et Ilona Riipinen. « Exploring the potential of nano-Köhler theory to describe the growth of atmospheric molecular clusters by organic vapors using cluster kinetics simulations ». Atmospheric Chemistry and Physics 18, n^o 18 (27 septembre 2018) : 13733–54. http://dx.doi.org/10.5194/acp-18-13733-2018.

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Abstract. Atmospheric new particle formation (NPF) occurs by the formation of nanometer-sized molecular clusters and their subsequent growth to larger particles. NPF involving sulfuric acid, bases and oxidized organic compounds is an important source of atmospheric aerosol particles. One of the mechanisms suggested to depict this process is nano-Köhler theory, which describes the activation of inorganic molecular clusters to growth by a soluble organic vapor. In this work, we studied the capability of nano-Köhler theory to describe the initial growth of atmospheric molecular clusters by simulating the dynamics of a cluster population in the presence of a sulfuric acid–base mixture and an organic compound. We observed nano-Köhler-type activation in our simulations when the saturation ratio of the organic vapor and the ratio between organic and inorganic vapor concentrations were in a suitable range. However, nano-Köhler theory was unable to predict the exact size at which the activation occurred in the simulations. In some conditions, apparent cluster growth rate (GR) started to increase close to the activation size determined from the simulations. Nevertheless, because the behavior of GR is also affected by other dynamic processes, GR alone cannot be used to deduce the cluster growth mechanism.

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Shin, Seung-Kyu, Tran Huyen et Ji-Hyeon Song. « Removal of Inorganic Odorous Compounds by Scrubbing Techniques using Silver Nano-particles ». Journal of Korean Society for Atmospheric Environment 24, n^o 6 (31 décembre 2008) : 674–81. http://dx.doi.org/10.5572/kosae.2008.24.6.674.

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Lee, Chung‐Kook, Robert F. Speyer et Geoffrey W. D. Spratt. « Synthesis of nano‐sized barium ferrite particles using an inorganic dispersing phase ». Journal of Applied Physics 73, n^o 10 (15 mai 1993) : 6266–68. http://dx.doi.org/10.1063/1.352665.

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Yu, Guang, Yujia Cheng et Zhicheng Wu. « Effect of Nano-MgO Particles Doping on Breakdown Characteristics of Polypropylene ». Coatings 10, n^o 4 (25 mars 2020) : 312. http://dx.doi.org/10.3390/coatings10040312.

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In this article, the nano-MgO particles were used as inorganic fillers, and polypropylene (PP) polymer was used as a matrix. The nano-MgO/PP composites were prepared by double melt blending. Using the polarization microscope (PLM) test and hot-stage microscope test, the crystalline morphology of PP and nano-MgO/PP with different mass fraction were observed. Using the differential scanning calorimetry (DSC) test, the parameters and crystallinity in the process of isothermal crystallization could be obtained. Additionally, the samples of pure PP and nano-MgO/PP composites were dealt with using a breakdown test and a dielectric frequency spectra test. From the experimental results, nano-MgO particle doping decreased the samples’ crystal size, and the crystalline structure was converted from large spherulites to fascicled crystallization. Additionally, the crystallization rate became fast and crystallinity increased. According to the breakdown test, the nano-MgO particle doping made the composites form small, dense spherulites. The breakdown developed through a longer path, so the composites’ breakdown strength rose greatly. When the mass fraction of nano-MgO particles was 3%, the shape parameter of the composites’ Weibull distribution β was larger, which illustrated that the nano-MgO particles were dispersed uniformly in the PP matrix. According to the dielectric frequency spectra test, the dielectric constant of different nanocomposites were all lower than which of pure PP, but the loss angle tangent values were all higher than which of pure PP.

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Nogueira, Lucie S., Susana Ribeiro, Carlos M. Granadeiro, Eulália Pereira, Gabriel Feio, Luís Cunha-Silva et Salete S. Balula. « Novel polyoxometalate silica nano-sized spheres : efficient catalysts for olefin oxidation and the deep desulfurization process ». Dalton Trans. 43, n^o 25 (2014) : 9518–28. http://dx.doi.org/10.1039/c3dt53444h.

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Wang, Yuli, Huijuan Lu, Junjie Wang et Hang He. « Effects of Highly Crystalized Nano C-S-H Particles on Performances of Portland Cement Paste and Its Mechanism ». Crystals 10, n^o 9 (15 septembre 2020) : 816. http://dx.doi.org/10.3390/cryst10090816.

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In order to improve the early age strength of ordinary Portland cement-based materials, many early strength agents were applied in different conditions. Different from previous research, the nano calcium silicate hydrate (C-S-H) particles used in this study were synthesized through the chemical reaction of CaO, SiO2, and H2O under 120 °C using the hydrothermal method, and the prepared nano C-S-H particles were highly crystalized. The influences of different amounts of nano C-S-H particles (0%, 0.5%, 1%, 2% and 3% by weight of cement) on the setting time, compressive strength, and hydration heat of cement paste were studied. The hydration products and microstructure of the cement paste with different additions of nano C-S-H particles were investigated through thermogravimetry-differential thermal analysis (TG-DTA), X-ray powder diffraction (XRD), and scanning electron microscope (SEM) tests. The results show that the nano C-S-H particles could be used as an early strength agent, and the early strength of cement paste can be increased by up to 43% through accelerating the hydration of tricalcium silicate (C3S). However, the addition of more than 2% nano C-S-H particles was unfavorable to the later strength development due to more space being left during the initial accelerated hydration process. It is suggested that the suitable content of the nano C-S-H particles is 0.5%−1% by weight of cement.

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Castellanos-Rubio, Idoia, Rahul Munshi, Yueling Qin, David B. Eason, Iñaki Orue, Maite Insausti et Arnd Pralle. « Multilayered inorganic–organic microdisks as ideal carriers for high magnetothermal actuation : assembling ferrimagnetic nanoparticles devoid of dipolar interactions ». Nanoscale 10, n^o 46 (2018) : 21879–92. http://dx.doi.org/10.1039/c8nr03869d.

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Agaguseynova, Minirа M., et Mehriban R. Mikailova. « FORMATION OF Ru NANO-COMPOSITES ». IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, n^o 3 (27 février 2018) : 45. http://dx.doi.org/10.6060/tcct.20186103.5639.

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Researches of polymer immobilized nanoparticles of ruthenium have been carried out by frontal polymerization (FP) of ruthenium acrylonitrile (AN) complex in the presence of inorganic carrier. Assessment of their catalytic properties in the hydrogenation reaction of unsaturated compounds has been done. Effective and selective organo-inorganic catalyst has been synthesized on the basis of akrylonitril complex and its reactivity in the hydrogenation reaction of cyclohexen has been investigated. Synthesis of akrylonitril complex of ruthenium on the surface of mineral carrier SiO2 silica, its further polymerization and reduction leads to the formation of polymer-inorganic composite including nano-size particle of Ru stabilized by polymer matrix and inorganic carrier. The offered method is a new approach in the catalyst preparing. Synthesized samples of Ru- nano composetes have been studied by methods of element analysis, IR-spectroscopy and X-ray analysis. There are wide diffraction peaks at 300-800 °C range in the X-rays patterns of the obtained samples wich correspond to crystallic ruthenium. Broadening diffraction maximums testifies ultradisperse state of particles. Microporous structure with pore sizes to 20 nm and their uniform size distribution are typical for obtained nano composites. It has been determined that specific surface of carriers decreases after polymerization of RuAN on the surface, though it is bigger than S spec. of the polymerization product in SiO2 absence. Obtained hybride nano composites have developed surface and porous structure which provide accessibility of active centers of catalyst for reagents and their high activity in the researched catalytic reaction. Formation conditions of Ru nanoparticles influence on catalytic properties of the studied composites, for example, the use of various regimes of frontal polymerization in inert medium. With the increase of the reduction treatment temperature of nano-composites the hydrogenation rate of cyclohexene reduces, the reason of which is the integration of Ru particles in the obtaining of nano composites at high temperatures. It should be mentioned that after hydrogenation the main ruthenium mass in poly-RuAN (90%) will have zero valency. The polymer matrix reduces. It is also subjected to changes and it confirms by spectrum broadening. Thus, the synthesized hybridization of polymer-immobilized Ru-nanoparticles display high activity in the reaction of cyclohexene hydrogenation and keep their activity during repeated cycles of reactions. Catalytic properties of nano-composites depend on the conditions of their obtaining which influence apparently on the size of forming Ruthenium nanoparticles.Forcitation:Agaguseynova M.M., Mikailova M.R. Formation of Ru nano-composites. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 3. P. 45-50

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Wang, Yubin, Baojiang Sun, Zhiwei Hao et Jianhua Zhang. « Advances in Organic–Inorganic Hybrid Latex Particles via In Situ Emulsion Polymerization ». Polymers 15, n^o 14 (10 juillet 2023) : 2995. http://dx.doi.org/10.3390/polym15142995.

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Hybrid latex particles combine the unique properties of inorganic nano/micro particles with the inherent properties of polymers, exhibiting tremendous potential for a variety of applications. Recent years have witnessed an increased interest in the design and preparation of hybrid latex particles with well-defined size, structure and morphology. Due to its simplicity, versatility and environmental friendliness, the in situ (Pickering) emulsion polymerization has been demonstrated to be a powerful approach for the large-scale preparation of hybrid latex particles. In this review, the strategies and applications of in situ (Pickering) emulsion polymerization for the preparation of hybrid latex particles are systematically summarized. A particular focus is placed on the strategies for the preparation of hybrid latex particles with enhanced properties and well-defined core–shell, yolk–shell, multinuclear, raspberry-like, dumbbell-shaped, multipod-like or armored morphologies. We hope that the considerable advances, examples and principles presented in this review can motivate future contributions to provide a deeper understanding of current preparation technologies, develop new processes, and enable further exploitation of hybrid latex particles with outstanding characteristics and properties.

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Zha, Jun-Wei, Ben-Hui Fan, Zhi-Min Dang, Sheng-Tao Li et George Chen. « Microstructure and electrical properties in three-component (Al2O3–TiO2)/polyimide nanocomposite films ». Journal of Materials Research 25, n^o 12 (décembre 2010) : 2384–91. http://dx.doi.org/10.1557/jmr.2010.0306.

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Polyimide (PI)-matrix composite films containing inorganic nanoparticles (nano-Al2O3 and nano-TiO2) have been fabricated. A proposed model is used to explain different structures of the (Al2O3–TiO2)/PI (ATP) films synthesized by employing in situ polymerization. Dependences of dielectric permittivities of the ATP films on frequency and temperature were studied. Results show the breakdown strength of the films decreases with prolonging the corona aging time. The incorporation of the nano-Al2O3 and nano-TiO2 particles significantly improves the corona resistance of the films. The corona aging also influences the infrared absorbance, the glass transition temperature (Tg), and loss factor (tanδ) of the ATP films.

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Matsunaga, H., M. Kiguchi, B. Roth et P. D. Evans. « Visualisation of Metals in Pine Treated with Preservative Containing Copper and Iron Nanoparticles ». IAWA Journal 29, n^o 4 (2008) : 387–96. http://dx.doi.org/10.1163/22941932-90000193.

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In this study we compared the ability of conventional and field-emission scanning-electron-microscopy (FESEM) and energy-dispersive analysis of X-rays (EDX) to visualise and map inorganic nano and microparticles in Southern pine (Pinus sp.) treated with an aqueous dispersion of micronised copper-carbonate and iron oxide. Conventional SEM-EDX was able to detect areas of the wood microstructure that contained higher concentrations of copper and iron, but EDX maps were affected by drift and specimens suffered beam damage. The high brightness of the FESEM's electron beam at low accelerating voltages reduced beam damage and helped when mapping the distribution of copper and iron particles. The clarity of EDX maps was further improved by using drift-correction software and by mapping low energy X-rays. FESEM-EDX was able to resolve individual copper and iron microparticles. We conclude that FESEM-EDX shows promise as a means of resolving and mapping the distribution of inorganic metal particles in wood and that this may lead to greater use of the technology as interest in the treatment of wood with inorganic nano and microparticles grows.

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Du, Weiping, Yingying Ding, Yang Zhang et Huifang Chen. « Preparation of Surface-Modified Nano Zinc Sulfide/Polyurethane Inorganic-Organic Transparent Coating and Its Application in Resin Lens ». Coatings 11, n^o 8 (26 juillet 2021) : 894. http://dx.doi.org/10.3390/coatings11080894.

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The surface modified hydrophilic zinc sulfide nano powder was prepared by hydrothermal method, and the corresponding zinc sulfide/polyurethane organic-inorganic composite transparent coating via in-situ polymerization. The structure of ZnS Nanoparticles and organic-inorganic composite coating were characterized by Infrared Spectroscopy, X-Ray Diffraction, Laser Particle Size Analyzer and Scanning Electron Microscopy. The optical properties were measured by Ultraviolet-Visible spectrophotometer and ellipsometry. The results show that the monodisperse hydrophilic nano zinc sulfide powder with a particle size of about 70 nm can be obtained by thioglycolic acid (TGA) modification, which has good compatibility with waterborne polyurethane. Nano zinc sulfide increased the refractive index of the coating significantly and the refractive index of the coatings could be controlled in the region of 1.46–1.71 organic-inorganic composite coating by adding ZnS. When the amount of nano ZnS added was 30%, the refractive index of the hybrid coating can reach 1.71, and the transmittance was more than 90%. The cured coatings were smooth and no agglomeration between nano ZnS particles could be found. After application on the surfaces of resin lens, the coatings presented better impact resistance, which indicated that the coating has application prospects in the field of fine processing of lens’ surfaces.

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