Journal articles: 'Nanostructured composite'

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Pauly, Alain, Sahal Saad Ali, Christelle Varenne, Jérôme Brunet, Eduard Llobet, and Amadou L. Ndiaye. "Phthalocyanines and Porphyrins/Polyaniline Composites (PANI/CuPctBu and PANI/TPPH2) as Sensing Materials for Ammonia Detection." Polymers 14, no. 5 (February 24, 2022): 891. http://dx.doi.org/10.3390/polym14050891.

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We combined a conducting polymer, polyaniline (PANI), with an organic semiconducting macrocyclic (MCs) material. The macrocycles are the phthalocyanines and porphyrins used to tune the electrical properties of the PANI, which benefits from their ability to enhance sensor response. For this, we proceeded by a simple ultrasonically assisted reaction involving the two components, i.e., the PANI matrix and the MCs, to achieve the synthesis of the composite nanostructure PANI/MCs. The composite nanostructure has been characterized and deposited on interdigitated electrodes (IDEs) to construct resistive sensor devices. The isolated nanostructured composites present good electrical properties dominated by PANI electronic conductivity, and the characterization reveals that both components are present in the nanostructure. The experimental results obtained under gas exposures show that the composite nanostructures can be used as a sensing material with enhanced sensing properties. The sensing performance under different conditions, such as ambient humidity, and the sensor’s operating temperature are also investigated. Sensing behavior in deficient humidity levels and their response at different temperatures revealed unusual behaviors that help to understand the sensing mechanism. Gas sensors based on PANI/MCs demonstrate significant stability over time, but this stability is highly reduced after experiments in lower humidity conditions and at high temperatures.

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Filho, Aureo Murador, Dayse Iara dos Santos, Marcos Yukio Kussuda, Camilla dos Santos Zanatta, Jae Geon Kim, Don Qui Shi, and Shi Xie Dou. "ZnO-TiO₂ Composite Formed by Mixed Oxides via Polyol." Materials Science Forum 727-728 (August 2012): 888–93. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.888.

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Among the researches on preparation and test of nanostructured materials, titanium dioxide and zinc oxide have been the most frequent studied oxides. In order to extend their properties, composites have been prepared using three different methods: Polyol Method, Sol-gel Process and a combination of the two processes (hybrid process). Recent research showed best properties in composite materials than in pure oxides. In this work is presented the preparation and the structural characterization of ZnO-TiO2 composite nanostructures to be tested for their performance in electrocatalysis and in further trial on photovoltaic cells.

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ŻÓRAWSKI, Wojciech, Medard MAKRENEK, Anna GÓRAL, and Sławomir ZIMOWSKI. "HVOF SPRAYED NANOSTRUCTURED COMPOSITE COATINGS WITH A REDUCED FRICTION COEFFICIENT." Tribologia, no. 4 (August 31, 2017): 0. http://dx.doi.org/10.5604/01.3001.0010.6056.

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Nanostructured materials provide new possibilities, which enable creating composite structures with much better properties than composites obtained from conventional materials. Such a solution facilitates combining selected features of different nanomaterials in order to obtain a composite with the required durability, thermal, insulation, tribological, etc. properties. In the case of a composite containing a solid lubricant, it is comprised of a nanostructured matrix, providing mechanical durability, and an evenly distributed nanostructured solid lubricant. A study of the tribological properties of composite HVOF sprayed from nanostructured WC-12Co mixed with nanostructured Fe3O4, having the properties of the solid lubricant is presented. The coatings were sprayed by means of a Hybrid Diamond Jet system. A T-01 ball on disc tribological tester was used to determine the coefficient of friction on the basis of friction force obtained in the course of continuous measurement at a set load. The result of investigations was compared with properties of coatings sprayed with standard WC-12Co/ Fe3O4.

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Lomovsky, O. I., Vjacheslav I. Mali, Dina V. Dudina, M. A. Korchagin, Dae Hwan Kwon, Ji Soon Kim, and Young Soon Kwon. "Shock-Wave Synthesis of Titanium Diboride in Copper Matrix and Compaction of TiB₂-Cu Nanocomposites." Materials Science Forum 534-536 (January 2007): 921–24. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.921.

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TiB2-Cu composites in a nanostructured state are candidates for high-strength conductive and erosion-resistant materials. In this work, we studied formation of nanostructured TiB2-Cu composites under shock wave conditions. We investigated the influence of preliminary mechanical activation (MA) of Ti-B-Cu powder mixtures on the peculiarities of the reaction between Ti and B under shock wave. In the MA-ed mixture the reaction proceeded completely while in the nonactivated mixture the reagents remained along with the product – titanium diboride. The size of titanium diboride particles in the central part of the compact was 100-300 nm. This research shows that shock wave synthesis in mechanically activated powder mixtures with simultaneous compaction of the composite is a promising way to materials with submicron and nanostructures.

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Li, Geng. "Electrochemical Sensor under Nanostructured Materials." Key Engineering Materials 852 (July 2020): 70–79. http://dx.doi.org/10.4028/www.scientific.net/kem.852.70.

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In order to study the electrochemical sensor of nanometer mechanism materials to realize the high sensitive detection of different chemical molecules, in this research, the preparation methods of molybdenum dioxide nanomaterials, molybdenum dioxide/metal particles (Au, Pt, Au@Pt) composites and the preparation of molybdenum dioxide nanomaterials, molybdenum dioxide /Au composite nanomaterials, molybdenum dioxide /Pt composite nanomaterials and molybdenum dioxide /Au @Pt composite nanomaterials were introduced. Then the electrochemical behavior of several modified electrodes, electrochemical behavior in catechol system, scanning and pH were applied to the modified electrode. Finally, the electrode p-catechol system was detected by differential pulse voltammetry and the actual samples were analyzed. The results showed that compared with unmodified electrode materials, the electrode modified by molybdenum dioxide nanomaterials, molybdenum dioxide /Au composite nanomaterials, molybdenum dioxide /Pt composite nanomaterials and molybdenum dioxide /Au @Pt composite nanomaterials has better electrocatalytic performance and the detection of catechol has a good effect. Among them, the electrochemical sensor constructed by MoS2-Au@Pt composite has the best detection performance for catechol. The results have a good guiding significance for the performance improvement of electrochemical sensor.

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Chen, Hongjun, and Lianzhou Wang. "Nanostructure sensitization of transition metal oxides for visible-light photocatalysis." Beilstein Journal of Nanotechnology 5 (May 23, 2014): 696–710. http://dx.doi.org/10.3762/bjnano.5.82.

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To better utilize the sunlight for efficient solar energy conversion, the research on visible-light active photocatalysts has recently attracted a lot of interest. The photosensitization of transition metal oxides is a promising approach for achieving effective visible-light photocatalysis. This review article primarily discusses the recent progress in the realm of a variety of nanostructured photosensitizers such as quantum dots, plasmonic metal nanostructures, and carbon nanostructures for coupling with wide-bandgap transition metal oxides to design better visible-light active photocatalysts. The underlying mechanisms of the composite photocatalysts, e.g., the light-induced charge separation and the subsequent visible-light photocatalytic reaction processes in environmental remediation and solar fuel generation fields, are also introduced. A brief outlook on the nanostructure photosensitization is also given.

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Evdokimov, Ivan A., Rinat R. Khayrullin, Sergei A. Perfilov, Andrey A. Pozdnyakov, Rustem H. Bagramov, Igor A. Perezhogin, Alexey N. Kirichenko, and Vladimir D. Blank. "Nanostructured aluminum matrix composite materials, modified by carbon nanostructures." Materials Today: Proceedings 5, no. 12 (2018): 26153–59. http://dx.doi.org/10.1016/j.matpr.2018.08.046.

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Vysikaylo, P. I. "Quantum Size Effects Arising from Nanocomposites Physical Doping with Nanostructures Having High Electron Affinit." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 3 (96) (June 2021): 150–75. http://dx.doi.org/10.18698/1812-3368-2021-3-150-175.

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This article considers main problems in application of nanostructured materials in high technologies. Theoretical development and experimental verification of methods for creating and studying the properties of physically doped materials with spatially inhomogeneous structure on micro and nanometer scale are proposed. Results of studying 11 quantum size effects exposed to nanocomposites physical doping with nanostructures with high electron affinity are presented. Theoretical and available experimental data were compared in regard to creation of nanostructured materials, including those with increased strength and wear resistance, inhomogeneous at the nanoscale and physically doped with nanostructures, i.e., quantum traps for free electrons. Solving these problems makes it possible to create new nanostructured materials, investigate their varying physical properties, design, manufacture and operate devices and instruments with new technical and functional capabilities, including those used in the nuclear industry. Nanocrystalline structures, as well as composite multiphase materials and coatings properties could be controlled by changing concentrations of the free carbon nanostructures there. It was found out that carbon nanostructures in the composite material significantly improve impact strength, microhardness, luminescence characteristics, temperature resistance and conductivity up to 10 orders of magnitude, and expand the range of such components’ possible applications in comparison with pure materials, for example, copper, aluminum, transition metal carbides, luminophores, semiconductors (thermoelectric) and silicone (siloxane, polysiloxane, organosilicon) compounds

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Eskandari, Hossein. "Processing of Al/SiC/TiB₂ Hybrid Nanostructured Composites by Underwater Shock Wave Consolidation." Advanced Materials Research 829 (November 2013): 157–62. http://dx.doi.org/10.4028/www.scientific.net/amr.829.157.

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Aluminum matrix hybrid nanostructured composites containing 30vol.%TiB2/SiC particles were manufactured by underwater shock consolidation method. Underwater shock consolidation is a one-stage densification process, which involves a very rapid and intense deposition of shock energy on powder particle surfaces. The interfacial microstructure and characterizations of this composite was performed using scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the interface is clean and no reaction zone generated along the interface between SiC/TiB2particles and Al matrix. Transmission electron microscopy reveals the development of nanostructures in the Al matrix after shock wave consolidation. Density, hardness and bending strength of the composites compacts were measured. The hybrid composite samples showed better improvement in the bending strength regard to Al-30 vol. %TiB2and also Al-30 vol.%SiC composites.

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Dolbin, Igor V., Gusein M. Magomedov, and Georgii V. Kozlov. "The Influence of Phases Division Surface in Nanocomposites Polymer/2D-Nanofiller on their Reinforcement Degree - The Percolation Model." Key Engineering Materials 869 (October 2020): 516–23. http://dx.doi.org/10.4028/www.scientific.net/kem.869.516.

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The simple percolation model, in which critical indices are defined by the form of a reinforcing component of nanostructured composite structure, was proposed for the description of reinforcement degree for nanostructured composites polymer/2D-nanofiller. The indicated critical indices are close by absolute values to standard percolation indices. The form of reinforcing component controls the type of nanostructured composite. It has been shown that reinforcement degree of these nanomaterials is independent on modulus of elasticity of nanofiller, but is defined by its structure (aggregation level), created in polymer matrix. The percolation indices of a percolation model, which are due to the form of reinforcing component and nanocomposite type, are defined by its main characteristic – the fraction of phases division surface in overall sample volume and are the basic factor, controlling reinforcement degree of nanostructured composites.

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Brabec, Christoph J., Thomas Nann, and Sean E. Shaheen. "Nanostructured p–n Junctions for Printable Photovoltaics." MRS Bulletin 29, no. 1 (January 2004): 43–47. http://dx.doi.org/10.1557/mrs2004.16.

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AbstractBy controlling the morphology of organic and inorganic semiconductors on a molecular scale, nanoscale p–n junctions can be generated in a bulk composite. Such a composite is typically called a bulk heterojunction composite, which can be considered as one virtual semiconductor combining the electrical and optical properties of the individual components. Solar cells are one attractive application for bulk heterojunction composites. Conjugated polymers or oligomers are the favorite p-type semiconducting class for these composites, while for the n-type semiconductor, inorganic nanoparticles as well as organic molecules have been investigated. Due to the solubility of the individual components, printing techniques are used to fabricate them.

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Ayzenshtadt, Arcady, Valery Lesovik, Maria Frolova, Alexander Tutygin, and Victor Danilov. "Nanostructured Wood Mineral Composite." Procedia Engineering 117 (2015): 45–51. http://dx.doi.org/10.1016/j.proeng.2015.08.122.

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13

Shen, Jiacong, Junqi Sun, and Xi Zhang. "Polymeric nanostructured composite films." Pure and Applied Chemistry 72, no. 1-2 (January 1, 2000): 147–55. http://dx.doi.org/10.1351/pac200072010147.

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This research news describes the construction of polymeric nanostructured composite film based on a variety of interactions, such as hydrophobic–hydrophilic effect, electrostatic interaction, hydrogen bonding, etc. The work focused on developing strategies to solve the basic problems in the area of ultrathin film research, such as stability, improving the interface quality, creating patterned interface, and techniques to construct nanolayered structure. With in-depth study of the relationship between the microscopic layered architecture and macroscopic function of supramolecular assemblies, it is anticipated that one could obtain miniature devices or machines of high efficiency through integration of the assembling process and device fabrication.

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Zemtsova, Elena, Denis Yurchuk, and Vladimir Smirnov. "The Process of Nanostructuring of Metal (Iron) Matrix in Composite Materials for Directional Control of the Mechanical Properties." Scientific World Journal 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/979510.

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We justified theoretical and experimental bases of synthesis of new class of highly nanostructured composite nanomaterials based on metal matrix with titanium carbide nanowires as dispersed phase. A new combined method for obtaining of metal iron-based composite materials comprising the powder metallurgy processes and the surface design of the dispersed phase is considered. The following stages of material synthesis are investigated: (1) preparation of porous metal matrix; (2) surface structuring of the porous metal matrix by TiC nanowires; (3) pressing and sintering to give solid metal composite nanostructured materials based on iron with TiC nanostructures with size 1–50 nm. This material can be represented as the material type “frame in the frame” that represents iron metal frame reinforcing the frame of different chemical compositions based on TiC. Study of material functional properties showed that the mechanical properties of composite materials based on iron with TiC dispersed phase despite the presence of residual porosity are comparable to the properties of the best grades of steel containing expensive dopants and obtained by molding. This will solve the problem of developing a new generation of nanostructured metal (iron-based) materials with improved mechanical properties for the different areas of technology.

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Kumar, Lailesh, Harshpreet Singh, Santosh Kumar Sahoo, and Syed Nasimul Alam. "Effect of nanostructured Cu on microstructure, microhardness and wear behavior of Cu-xGnP composites developed using mechanical alloying." Journal of Composite Materials 55, no. 16 (January 14, 2021): 2237–48. http://dx.doi.org/10.1177/0021998320987887.

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In the present study, Cu-1, 2 and 3 wt.% xGnP composites have been developed by powder metallurgy (PM) route using nanostructured Cu powder and their effect on microstructure, microhardness, sliding wear behaviour has been examined. The crystallite size and lattice strain of Cu after 25 h of mechanical milling have been found to be 16 nm and 0.576%, respectively. Major challenges associated with the development of Cu-xGnP composites is the uniform dispersion of the nanoplatelets in the Cu matrix, which have been dealt out by incorporating the nanostructured Cu- xGnP composites after mechanical alloying leading to the homogenous distribution of nanoplatelets in the Cu-matrix. A significant enhancement in relative density, microhardness and wear resistance of the Cu-3 wt. % xGnP nanofiller composite in particular has been observed due to the uniform distribution of the nanofillers. In Cu-3 wt. % xGnP composite developed using as-milled nanostructured Cu, a microhardness of ∼ 1.1 GPa could be achieved which is about ∼3 times higher than that of the pure sintered Cu sample (∼359 MPa). Nanostructured Cu also leads to enhancement of the hardness and wear property as compared to the as-received Cu. The wear mechanism in the various nanostructured Cu-xGnP composites has been studied in details.

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Piticescu, Roxana M., Viorica Trandafir, V. Danciu, Z. Vuluga, Eugeniu Vasile, and D. Iordachescu. "Ternary Bio-Nanostructured Systems Prepared under High Pressure Conditions." Key Engineering Materials 361-363 (November 2007): 539–42. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.539.

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Many researchers have assumed that a combination of hydroxyl apatite (HAP) and collagen (COL) may be the best solution for bone replacement and have prepared their composites by several techniques [1]. However, such HAP/COL composite had no nanostructure similar to bone, and consequently indicated no bone-like mechanical properties. These results demonstrate that the chemical composition similar to bone only is insufficient for bone metabolism and mechanical properties. Mechanical and biological performance of this type of materials could be improved by adding TiO2 within the initial mixture of nanostructured composites [2]. Ternary nanostructured systems consisting of hydroxyl apatite, TiO2 aerogel and collagen were prepared for the first time by hydrothermal procedure in high pressure conditions. Among many advantages, the synthesis method proposed in this paper could lead to formation of chemically bonded compounds as a consequence of high pressure conditions. The resulted material could find applications in bone tissue regenerative medicine, either in powder form for bone defects treatment, or in matrix form as osteoconductive coating for metal implants. Further studies are necessary to evaluate the osteoconductive properties.

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Kim, Seong-Eun, Woo-Jin Cho, Jin-Kook Yoon, and In-Jin Shon. "The Effect of BN Reinforcement on the Mechanical Properties of Nanostructured Al2O3 Ceramics." Journal of Nanoscience and Nanotechnology 20, no. 7 (July 1, 2020): 4353–57. http://dx.doi.org/10.1166/jnn.2020.17581.

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In spite of many attractive properties, the low fracture toughness of Al2O3 ceramic below ductilebrittle transition temperature limits its wide application in industry. One of the most obvious methods to improve the fracture toughness has been to add reinforcing compounds to fabricate nanostructured composite materials. In this respect, BN was evaluated as the reinforcing agent of Al2O3 ceramics using pulsed current activated sintering (PCAS). Highly dense alumina-BN composites with a relative density of up to 100% were achieved within short periods (2 min) by PCAS under a 80 MPa pressure. The rapid sintering method allowed the retention of the nanostructure by inhibiting the grain growth. The grain size of alumina was reduced remarkably by the addition of BN. The addition of BN to Al2O3 ceramic simultaneously improved the hardness and fracture toughness of alumina-BN composite.

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Leont’ev, L. B., N. P. Shapkin, and V. N. Makarov. "Functional Nanostructured Tribotechnical Materials." Solid State Phenomena 265 (September 2017): 410–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.410.

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The paper describes the tribotechnical properties of thin-film coatings obtained by the tribotechnical modification of 40X grade steel with different organic and inorganic tribotechnical materials (natural inorganic and artificial polymers), as well as with composite materials based on vermiculite. Comparative tribotechnical investigations revealed that composites possess better tribotechnical properties than single-component materials. The most promising materials for the tribotechnical modification of steel friction surfaces are vermiculite-based nanostructured composites that provide minimal friction coefficient and high wear resistance under the conditions of boundary friction. The tribotechnical properties of polymagnesiumphenylsiloxane are a little worse than that of the materials based on vermiculite. Polymagnesiumphenylsiloxane and nanostructured composites based on vermiculite can be used as additives to motor oils and solid lubricants, as well as for the modification of friction surfaces during manufacturing or reconditioning of machine parts to increase their durability.

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Shon, In-Jin. "Synthesis and Sintering of Nanostructured ZrB2-SiC Composite." Korean Journal of Metals and Materials 59, no. 7 (July 5, 2021): 439–44. http://dx.doi.org/10.3365/kjmm.2021.59.7.439.

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ZrB2 is considered a candidate material for ultra-high temperature ceramics because of its high thermal conductivity, high melting point, and low coefficient of thermal expansion. Despite these attractive properties, applications of ZrB2 are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the approach universally utilized has been to add a second material to form composites and fabricate nanostructured materials. One example of this is the adding of SiC to ZrB2 to improve fracture toughness. SiC has low density, excellent resistance to oxidation in air, and a high melting point. Therefore, SiC may be a promising additive as a reinforcing material for ZrB2-based composites. A dense nanostructured ZrB2-SiC composite was rapidly synthesized and sintered by high-frequency induction heating (HFIH) within 4 min in one step, from mechanically activated powders of ZrC, 2B and Si. Simultaneous combustion synthesis and consolidation were accomplished using the combination of current and mechanical pressure. A highly dense ZrB2-SiC composite with a relative density of up to 98.4% was fabricated using the simultaneous application of 70 MPa pressure and an induced current. The mechanical properties (toughness and hardness) and the average grain size of the composite were investigated.

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Trusova, Elena A., Dmitrii D. Titov, Asya M. Afzal, and Sergey S. Abramchuk. "Influence of Graphene Sheets on Compaction and Sintering Properties of Nano-Zirconia Ceramics." Materials 15, no. 20 (October 20, 2022): 7342. http://dx.doi.org/10.3390/ma15207342.

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The use of a nanostructured graphene-zirconia composite will allow the development of new materials with improved performance properties and a high functionality. This work covers a stepwise study related to the creation of a nanostructured composite based on ZrO2 and graphene. A composite was prepared using two suspensions: nano-zirconia obtained by sol-gel synthesis and oxygen-free graphene obtained sonochemically. The morphology of oxygen-free graphene sheets, phase composition and the morphology of a zirconia powder, and the morphology of the synthesized composite were studied. The effect of the graphene sheets on the rheological and sintering properties of a nanostructured zirconia-based composite powder has been studied. It has been found that graphene sheets in a hybrid nanostructure make it difficult to press at the elastic deformation stage, and the composite passes into the plastic region at a lower pressure than a single nano-zirconia. A sintering mechanism was proposed for a composite with a graphene content of 0.635 wt%, in which graphene is an important factor affecting the process mechanism. It has been determined that the activation energy of the composite sintering is more than two times higher than for a single nano-zirconia. Apparently, due to the van der Waals interaction, the graphene sheets partially stabilize the zirconia and prevent the disordering of the surface monolayers of its nanocrystals and premelting prior to the sintering. This leads to an increase in the activation energy of the composite sintering, and its sintering occurs, according to a mixed mechanism, in which the grain boundary diffusion predominates, in contrast to the single nano-zirconia sintering, which occurs through a viscous flow.

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Silchenko, O. B., M. V. Siluyanova, V. Е. Nizovtsev, D. A. Klimov, and A. A. Kornilov. "On the prospects of application of nanostructured heterophase polyfunctional composite materials inengine building industry." Voprosy Materialovedeniya, no. 1(93) (January 6, 2019): 50–57. http://dx.doi.org/10.22349/1994-6716-2018-93-1-50-57.

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The paper gives a brief review of properties and applications of developed extra-hard nanostructured composite materials and coatings based on them. The presentresearch suggestsaerospace applications of nanostructured composite materials based on carbides, carbonitrides and diboridesof transition and refractory metals. To improve the technical and economic performance of gas turbine engines, it is advisable to use new composite structural materials whose basic physicomechanical properties are several times superior to traditional ones. The greatest progress in developing new composites should be expected in the area of materials created on the basis of polymer, metal, intermetallic and ceramic matrices. Currently components and assemblies of gas turbine engines and multiple lighting power units with long operation life and durability will vigorously develop. Next-generation composites are studied in all developed countries, primarily in the United States and Japan.

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Guo, Ning, Jiaming Sun, Yunlei Li, Xiaoyu Lv, Junguo Gao, Mingpeng He, and Yue Zhang. "Nonlinear Surface Conductivity Characteristics of Epoxy Resin-Based Micro-Nano Structured Composites." Energies 15, no. 15 (July 25, 2022): 5374. http://dx.doi.org/10.3390/en15155374.

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Nonlinear composite materials serve to homogenize electric fields and can effectively improve the local concentration of the electric field in power systems. In order to study the nonlinear surface conductivity properties of micro-nano epoxy composites, two types of epoxy micro-nano composite specimens were prepared in the laboratory using the co-blending method. The surface conductivity of the composites was tested under different conditions using a high-voltage DC surface conductivity test system. The results show that the surface conductivity of micro-nano structured composites increases and then decreases with the rise of nanofiller doping concentration. The nonlinear coefficient was 1.781 at 4 wt% of doped nanostructured SiC, which was the most significant nonlinear coefficient compared to other doping contents. For the same doping concentration, the micro-nano structured composites doped with nanostructured SiC have more significant surface conductivity at the same test temperature with a nonlinear coefficient of 1.635. As the temperature increases, the surface conductivity of the micro-nano structured composite increases significantly, and the threshold field strength moves towards the high electric field. Along with the increase in temperature, the nonlinear coefficients of micro-nano composites after doping with nanostructured SiC showed a gradually decreasing trend. The temperature has little effect on the nonlinear coefficients of the micro-nano structured composites after doping with O-MMT.

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Abdelraheem, Amira, Ahmed H. El-Shazly, and M. F. El-Kady. "Nanofiber Polyaniline and Polyaniline-Clay Nanocomposite Prepared via Sonochemical and Sol-Gel Techniques." Materials Science Forum 860 (July 2016): 12–16. http://dx.doi.org/10.4028/www.scientific.net/msf.860.12.

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Polyaniline (PANI) and polyaniline-clay (PANI-clay) composite nanostructured materials were prepared via both ultrasonic irradiation and sol-gel preparation techniques. The molecular structure of prepared PANI and PANI-clay composite samples were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The characterization results confirm the nanostructure of prepared samples. BET surface area results were obtained for the prepared matrices. TEM and SEM images showed the morphology of the fabricated nanomaterials.

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Skury, Ana Lúcia Diegues, Sérgio Neves Monteiro, Marcia G. de Azevedo, Laís B. Motta, and Guerold Sergueevitch Bobrovinitchii. "Performance of Nanostructured Diamond Composites in Wear Tests." Materials Science Forum 727-728 (August 2012): 919–23. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.919.

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Diamond-Si nanostructured composites were obtained by cyclic high pressure and high temperature sintering with different processing conditions to examine the dominant microstructural factors and the abrasive wear resistance. The microstructure of the composites was characterized by scanning electron microscopy. The abrasive wear behavior of the composites was evaluated by weight loss in abrasion tests. It was found that improved nanostructured composite properties and denser structures were obtained for sintering performed with more than one cycle of pressure and temperature.

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LI, WEN, DAISUKE ISHIKAWA, and HIROKAZU TATSUOKA. "SYNTHESES OF NANOSTRUCTURE BUNDLES BASED ON SEMICONDUCTING METAL SILICIDES." Functional Materials Letters 06, no. 05 (October 2013): 1340011. http://dx.doi.org/10.1142/s1793604713400110.

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A variety of nanostructure bundles and arrays based on semiconducting metal silicides have been synthesized using abundant and non-toxic starting materials. Three types of fabrication techniques of the nanostructure bundles or arrays, including direct growth, template synthesis using natural nanostructured materials and template synthesis using artificially fabricated nanostructured materials are demonstrated. CrSi 2 nanowire bundles were directly grown by the exposure of Si substrates to CrCl 2 vapor at atmospheric pressure. A hexagonal MoSi 2 nanosheet, Mg 2 Si / MgO composite nanowire and Mg 2 Si nanowire bundles and MnSi 1.7 nanowire array were synthesized using a MoS 2 layered material, a SiO x nanofiber bundle, a Si nanowire array, and a Si nanowire array as the templates, respectively. Additionally, the fabrication phenomenon and structural properties of the nanostructured semiconducting metal silicides were investigated. These reactions provided the low-cost and controllable synthetic techniques to synthesize large scale and one-dimensional semiconducting metal silicides for thermoelectric applications.

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Shon, In-Jin. "Synthesis and Sintering of Nanostructured ZrB2-Al2O3 Composite." Korean Journal of Metals and Materials 59, no. 10 (October 5, 2021): 692–97. http://dx.doi.org/10.3365/kjmm.2021.59.10.704.

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ZrB2 is considered a candidate material for ultra-high temperature ceramics because of its high thermal conductivity, high melting point, and low coefficient of thermal expansion. Despite these attractive properties, ZrB2 applications are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the approach universally utilized has been to add a second material to form composites, and to fabricate nanostructured materials. In this study a dense nanostructured ZrB2-Al2O3 composite was rapidly sintered using the pulsed current activated heating (PCAH) method within 3 min in one step, from mechanically synthesized powders of ZrB2 and Al2O3. Consolidation was accomplished using an effective combination of current and mechanical pressure. A highly dense ZrB2- Al2O3 composite with a relative density of up to 97.4% was fabricated using the simultaneous application of 70 MPa pressure and a pulsed current. The fracture toughness and hardness of the ZrB2-Al2O3 composite were 3.9 MPa.m1/2 and 1917 kg/mm2, respectively. The fracture toughness of the composite was higher than that of monolithic ZrB2.

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Shon, In-Jin. "Synthesis and Sintering of Nanostructured ZrB2-Al2O3 Composite." Korean Journal of Metals and Materials 59, no. 10 (October 5, 2021): 692–97. http://dx.doi.org/10.3365/kjmm.2021.59.10.692.

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ZrB2 is considered a candidate material for ultra-high temperature ceramics because of its high thermal conductivity, high melting point, and low coefficient of thermal expansion. Despite these attractive properties, ZrB2 applications are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the approach universally utilized has been to add a second material to form composites, and to fabricate nanostructured materials. In this study a dense nanostructured ZrB2-Al2O3 composite was rapidly sintered using the pulsed current activated heating (PCAH) method within 3 min in one step, from mechanically synthesized powders of ZrB2 and Al2O3. Consolidation was accomplished using an effective combination of current and mechanical pressure. A highly dense ZrB2- Al2O3 composite with a relative density of up to 97.4% was fabricated using the simultaneous application of 70 MPa pressure and a pulsed current. The fracture toughness and hardness of the ZrB2-Al2O3 composite were 3.9 MPa.m1/2 and 1917 kg/mm2, respectively. The fracture toughness of the composite was higher than that of monolithic ZrB2.

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Wang, Wei Guo, Yi-Lin Liu, Rasmus Barfod, Steen Brian Schougaard, Petru Gordes, Severine Ramousse, Peter Vang Hendriksen, and Mogens Mogensen. "Nanostructured Lanthanum Manganate Composite Cathode." Electrochemical and Solid-State Letters 8, no. 12 (2005): A619. http://dx.doi.org/10.1149/1.2081890.

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Aal, A. Abdel, M. Bahgat, and M. Radwan. "Nanostructured Ni–AlN composite coatings." Surface and Coatings Technology 201, no. 6 (December 2006): 2910–18. http://dx.doi.org/10.1016/j.surfcoat.2006.06.002.

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Narayan, Roger J., and Dirk Scholvin. "Nanostructured carbon-metal composite films." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 23, no. 3 (2005): 1041. http://dx.doi.org/10.1116/1.1897712.

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Shayakhmetov, U. Sh, and A. R. Murzakova. "Efficient Multipupose Nanostructured Composite Ceramic." Refractories and Industrial Ceramics 55, no. 1 (May 2014): 49–51. http://dx.doi.org/10.1007/s11148-014-9657-4.

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Żórawski, W., M. Makrenek, and A. Góral. "Mechanical Properties and Corrosion Resistance of HVOF Sprayed Coatings Using Nanostructured Carbide Powders." Archives of Metallurgy and Materials 61, no. 4 (December 1, 2016): 1839–46. http://dx.doi.org/10.1515/amm-2016-0297.

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Abstract Nanostructured and composite WC-12Co coatings were prepared by means of the supersonic spray process (HVOF). The microstructure and composition of WC-12Co nanostructured powder were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Investigations revealed nano grains of WC with the size in the range of 50-500 nm. The nanostructured sprayed coating was analysed by SEM and phase composition was investigated by X-ray diffractometer (XRD). A denser coating structure with higher hardness was observed compared to conventional coating with a small amount of W2C, WC1−x, W and some amorphous phase. Young’s modulus and hardness were determined by depth sensing indentation in HVOF sprayed WC-12Co nanostructured coatings. Results were compared to conventional coatings and the relevance of the nanostructure was analyzed. An indentation size effect was observed on the polished surface and cross-section of both coatings. Data provided by indentation tests at maximum load allow to estimate hardness and elastic modulus. Enhanced nanomechanical properties of conventional coating in comparison to nanostructured one were observed. Nanostructured coatings WC-12Co (N) revealed significantly better corrosion resistance.

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Yang, Yong, Dianran Yan, Yanchun Dong, Xueguang Chen, Lei Wang, Zhenhua Chu, Jianxin Zhang, and Jining He. "Preparing of nanostructured Al2O3–TiO2–ZrO2 composite powders and plasma spraying nanostructured composite coating." Vacuum 96 (October 2013): 39–45. http://dx.doi.org/10.1016/j.vacuum.2013.03.010.

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Nunes, Daniela, Vanessa Livramento, Horácio Fernandes, Carlos Silva, Nobumitsu Shohoji, José B. Correia, and Patricia A. Carvalho. "Multiscale Copper-µDiamond Nanostructured Composites." Materials Science Forum 730-732 (November 2012): 925–30. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.925.

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Nanostructured copper-diamond composites can be tailored for thermal management applications at high temperature. A novel approach based on multiscale diamond dispersions is proposed for the production of this type of materials: a Cu-nDiamond composite produced by high-energy milling is used as a nanostructured matrix for further dispersion of micrometer sized diamond. The former offers strength and microstructural thermal stability while the latter provides high thermal conductivity. A series of Cu-nDiamond mixtures have been milled to define the minimum nanodiamond fraction suitable for matrix refinement and thermal stabilization. A refined matrix with homogenously dispersed nanoparticles could be obtained with 4 at.% nanodiamond for posterior mixture with mDiamond and subsequent consolidation. In order to define optimal processing parameters, consolidation by hot extrusion has been carried out for a Cu-nDiamond composite and, in parallel, for a mixture of pure copper and mDiamond. The materials produced were characterized by X-ray diffraction, scanning and transmission electron microscopy and microhardness measurements.

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Tomczyk, Monika, Pawel Osewski, Marie-Helene Berger, Ryszard Diduszko, Iwona Jóźwik, Giorgio Adamo, and Dorota A. Pawlak. "Bulk nanocomposite made of ZnO lamellae embedded in the ZnWO4 matrix: growth from the melt." Journal of Materials Science 56, no. 19 (April 1, 2021): 11219–28. http://dx.doi.org/10.1007/s10853-021-06020-y.

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AbstractZinc oxide (ZnO) nanostructures exhibiting high exciton binding energy and efficient radiative recombination, even at the room temperature, are of increasing interest due to their prospective exploitation in optoelectronic and laser applications. However, attempts to synthesize well-ordered structures through simple and fast process have faced many difficulties. Here, we demonstrate a novel manufacturing method of ZnO lamellae embedded in a crystalline wide band gap dielectric matrix of the zinc tungstate, ZnWO4. The manufacturing method is based on a directional solidification of a eutectic composite, directly from the melt, resulting in a nanostructured bulk material. Electron microscopy studies revealed clear phase separation between the ZnO and ZnWO4 phases, and cathodoluminescence confirmed exciton emission at room temperature and thus high quality and crystallinity of the ZnO lamellae, without defect emission. Hence, utilization of directional solidification of eutectics may enable cost-efficient manufacturing of bulk nanostructured ZnO composites and their use in optical devices. Graphical abstract

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Shchetinin, Y., Y. Kopylov, and A. Zhirkov. "The Effect of Surface Active Substances on the Mechanical Properties of a Copper-Matrix Nanocomposite." Materials Science Forum 945 (February 2019): 493–97. http://dx.doi.org/10.4028/www.scientific.net/msf.945.493.

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The presented work reviews the research in the field of production of nanostructured composite materials based on copper, reinforced with carbon nanostructures. Particular attention is paid to the use of composites with high thermal conductivity as structural materials. The method of manufacturing a composite material based on copper is described in detail: modes of preliminary annealing, pre-pressing, hot isostatic pressing. The characteristics of the matrix and alloying components are given, and also preliminary treatment of copper powder and carbon nanotubes is described. Different mechanisms of component mixing are considered, the process of mechanical alloying in a planetary mill is described in detail, the results of measuring the thermal conductivity of samples are given. The mechanical characteristics of the samples are considered in detail: ultimate strength, yield strength, elongation. The degree of influence of surfactants on the uniformity of the distribution of alloying components and the mechanical properties of the composite material is determined.

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Saydaxmedov, Ravshan, and Kutpnisa Kadirbekova. "Study of the composition and properties of vacuum coatings based on titanium carbide." E3S Web of Conferences 264 (2021): 05023. http://dx.doi.org/10.1051/e3sconf/202126405023.

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Carbide cutting tools are used for machining of machine parts made of complex alloyed materials. Application of protective composite nanostructured coatings on carbide cutting tools allows increasing the service life of cutting tools several times. The coating on their base protects the cobalt binding of carbide alloys. The low thermal conductivity of the composite nanostructured titanium carbide coating means that the heat generated when cutting workpieces is mostly transferred to the chips so that the tool does not become overheated. This is important when machining difficult alloyed, hard-to-machine, ductile materials for which the temperature at the contact zone of the cutting edge and the machined material reaches up to 900°C. The adhesive interaction of the composite nanostructured coating with the substrate material is of no small importance in selecting the coating composition. From this point of view, carbide titanium coatings have good compatibility with carbide cutting tools. Along with this, the study of ion-plasma composite nanostructured coatings based on TiC carbides is relevant. The study results of the composition and properties of vacuum composite nanostructured coatings based on titanium carbides obtained by the ion-plasma method are presented. Studies of the chemical composition, the electronic and atomic structure of composite nanostructured coatings based on Ti carbides were carried out using the HREELS, XPS, and AES method and based on experimental studies of composite nanostructured TiC coatings, the p – T – x diagrams for TiC were refined.

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Crisan, Liana, Olga Soritau, Mihaela Baciut, Grigore Baciut, and Bogdan Vasile Crisan. "THE INFLUENCE OF LASER RADIATION ON HUMAN OSTEOBLASTS CULTURED ON NANOSTRUCTURED COMPOSITE SUBSTRATES." Medicine and Pharmacy Reports 88, no. 2 (April 29, 2015): 224–32. http://dx.doi.org/10.15386/cjmed-433.

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Background & Aims. Carbon-based nanomaterials such as carbon nanotubes, graphene oxide and graphene have been explored by researchers as well as the industry. Graphene is a new nanomaterial which has commercial and scientific advantages. Laser therapy has proven highly useful in biomedicine, with the use of different laser types and energies for distinct purposes. The low level laser therapy (LLLT) can have anti-inflammatory, analgesic and biostimulant effects. Recent research has shown that laser radiation has different effects on osteoblasts. The aim of this study was to identify the influence of laser radiation on human osteoblastic cells cultured on nanostructured composite substrates.Materials and methods. Four types of substrates were created using colloidal suspensions of nanostructured composites in PBS at a concentration of 30 µg/ml. We used human osteoblasts isolated from patella bone pieces harvested during arthroplasty. Irradiation of osteoblasts cultured on nanostructured composite substrates was made with a semiconductor laser model BTL-10 having a wavelength of 830 nm. The proliferation activity of osteoblast cells was assessed using the MTT assay. After laser irradiation procedure the viability and proliferation of osteoblast cells were analyzed using fluorescein diacetate (FDA) staining. Results. The osteoblast cells viability and proliferation were evaluated with MTT assay at 30 minutes, 24 hours, 5 days and 10 days after laser irradiation. In the first 30 minutes there were no significant differences between the irradiated and non-irradiated cells. At 24 hours after laser irradiation procedure a significant increase of MTT values in case of irradiated osteoblasts cultivated on nanostructured hydroxyapatite, nanostructured hydroxyapatite with gold nanoparticles and 1.6% and 3.15% graphenes composites substrates was observed. A more marked proliferation rate was observed after 10 days of irradiation for irradiated osteoblasts seeded on nanostructured hydroxyapatite with gold nanoparticles and graphenes containing substrate. Using FDA staining we obtained very similar results with MTT test. Conclusions. The association between the 830 nm laser irradiation of osteoblasts and their long-term cultivation of the nanostructured composite substrates induces the cell proliferation and differentiation and, therefore, it will be a useful alternative for bone regeneration therapy.

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Aubekerov, K., K. N. Punegova, R. Sergeenko, A. Kuznetsov, V. M. Kondratev, S. A. Kadinskaya, S. S. Nalimova, and V. A. Moshnikov. "Synthesis and study of gas sensitive ZnFe₂O₄-modified ZnO nanowires." Journal of Physics: Conference Series 2227, no. 1 (March 1, 2022): 012014. http://dx.doi.org/10.1088/1742-6596/2227/1/012014.

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Abstract Currently, new nanostructured materials based on composite metal oxides is of great interest for the development of gas sensors with improved functional characteristics. In this work, zinc oxide nanowires were synthesized by hydrothermal method. Hierarchical ZnO/ZnFe2O4 nanostructures were obtained by immersion of zinc oxide layers in ferrous sulphate aqueous solution. The mechanism of zinc ferrite formation during the interaction of zinc oxide with iron sulphate is considered. The crystal structure of ZnO and ZnO/ZnFe2O4 were studied by Raman spectroscopy. The sensitivity of ZnO and ZnO/ZnFe2O4 nanostructures to isopropyl alcohol vapors was analyzed. It was shown that there is an optimal concentration of ferrous sulphate used to modify zinc oxide nanowires and synthesize ZnO/ZnFe2O4 composite nanostructures.

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He, Minghao, Mingzhao Li, and Zeyu Sun. "The Development of Si Anode Materials by Nanotechnology for Lithium-ion Battery." E3S Web of Conferences 308 (2021): 01007. http://dx.doi.org/10.1051/e3sconf/202130801007.

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Nowadays, lithium-ion batteries (LIBs) are applied in many fields for their high energy density, low cost, and long cycle life, highly appreciated in a commercial application. Anode materials, a vital factor contributing to high specific capacity, have caught great attention in next-generation LIBs development. Silicon (Si) has been generally considered one of the best substitutes for the commercial carbon-based anodes of lithium-ion batteries due to its extremely high theoretical capacity, excellent charge-discharge performance, and low cost compared with other anode materials. In this review, various silicon-based materials, including nanostructured silicon and silicon composite materials, are summarized, and both advantages and challenges are analyzed. The article emphasizes the remarkable electrochemical characteristics and significant improvement of battery performance by applying nanostructure and silicon composites conjugates. Besides, the challenges and outlook on the nanostructure design of Si and silicon composites are presented.

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Zou, Benxue, Shengchen Gong, Yan Wang, and Xiaoxia Liu. "Tungsten Oxide and Polyaniline Composite Fabricated by Surfactant-Templated Electrodeposition and Its Use in Supercapacitors." Journal of Nanomaterials 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/813120.

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Composite nanostructures of tungsten oxide and polyaniline (PANI) were fabricated on carbon electrode by electrocodeposition using sodium dodecylbenzene sulfonate (SDBS) as the template. The morphology of the composite can be controlled by changing SDBS surfactant and aniline monomer concentrations in solution. With increasing concentration of aniline in surfactant solution, the morphological change from nanoparticles to nanofibers was observed. The nanostructured WO3/PANI composite exhibited enhanced capacitive charge storage with the specific capacitance of 201 F g−1at 1.28 mA cm−2in large potential window of-0.5~ 0.65 V versus SCE compared to the bulk composite film. The capacitance retained about 78% when the sweeping potential rate increased from 10 to 150 mV/s.

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Garbiec, Dariusz, Volf Leshchynsky, Alberto Colella, Paolo Matteazzi, and Piotr Siwak. "Structure and Deformation Behavior of Ti-SiC Composites Made by Mechanical Alloying and Spark Plasma Sintering." Materials 12, no. 8 (April 18, 2019): 1276. http://dx.doi.org/10.3390/ma12081276.

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Combining high energy ball milling and spark plasma sintering is one of the most promising technologies in materials science. The mechanical alloying process enables the production of nanostructured composite powders that can be successfully spark plasma sintered in a very short time, while preserving the nanostructure and enhancing the mechanical properties of the composite. Composites with MAX phases are among the most promising materials. In this study, Ti/SiC composite powder was produced by high energy ball milling and then consolidated by spark plasma sintering. During both processes, Ti3SiC2, TiC and Ti5Si3 phases were formed. Scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction study showed that the phase composition of the spark plasma sintered composites consists mainly of Ti3SiC2 and a mixture of TiC and Ti5Si3 phases which have a different indentation size effect. The influence of the sintering temperature on the Ti-SiC composite structure and properties is defined. The effect of the Ti3SiC2 MAX phase grain growth was found at a sintering temperature of 1400–1450 °C. The indentation size effect at the nanoscale for Ti3SiC2, TiC+Ti5Si3 and SiC-Ti phases is analyzed on the basis of the strain gradient plasticity theory and the equation constants were defined.

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Курбанов, М. А., Ф. Н. Татардар, Н. А. Сафаров, И. С. Рамазанова, З. А. Дадашев, И. А. Фараджзаде, К. К. Азизова, and А. Ф. Гочуева. "Новая технология создания высокочувствительных сегнетопьезоэлектрических материалов на основе гибрида микро- и наноструктурированных полимеров." Журнал технической физики 89, no. 5 (2019): 744. http://dx.doi.org/10.21883/jtf.2019.05.47478.2443.

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AbstractFabrication of composites based on micro- and nanostructured hybrid polymers have been studied. A new technology for nanoparticle immobilization in the polymer matrix of the composite has been suggested. Its essence is to produce functional electronegative polymer segments in the polymer matrix, which are the main agents preventing nanoparticle mobilization in the polymer phase of a composite.

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Pérez-Verdejo, Amaury, Alvaro Sampieri, Heriberto Pfeiffer, Mayra Ruiz-Reyes, Juana-Deisy Santamaría, and Geolar Fetter. "Nanoporous composites prepared by a combination of SBA-15 with Mg–Al mixed oxides. Water vapor sorption properties." Beilstein Journal of Nanotechnology 5 (August 7, 2014): 1226–34. http://dx.doi.org/10.3762/bjnano.5.136.

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This work presents two easy ways for preparing nanostructured mesoporous composites by interconnecting and combining SBA-15 with mixed oxides derived from a calcined Mg–Al hydrotalcite. Two different Mg–Al hydrotalcite addition procedures were implemented, either after or during the SBA-15 synthesis (in situ method). The first procedure, i.e., the post-synthesis method, produces a composite material with Mg–Al mixed oxides homogeneously dispersed on the SBA-15 nanoporous surface. The resulting composites present textural properties similar to the SBA-15. On the other hand, with the second procedure (in situ method), Mg and Al mixed oxides occur on the porous composite, which displays a cauliflower morphology. This is an important microporosity contribution and micro and mesoporous surfaces coexist in almost the same proportion. Furthermore, the nanostructured mesoporous composites present an extraordinary water vapor sorption capacity. Such composites might be utilized as as acid-base catalysts, adsorbents, sensors or storage nanomaterials.

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Mari, Daniele, Robert Schaller, and Mehdi Mazaheri. "Mechanical Spectroscopy of Nanostructured Composite Materials." Journal of Physics: Conference Series 304 (July 6, 2011): 012085. http://dx.doi.org/10.1088/1742-6596/304/1/012085.

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Andrew, Jennifer S., Justin D. Starr, and Maeve A. K. Budi. "Prospects for nanostructured multiferroic composite materials." Scripta Materialia 74 (March 2014): 38–43. http://dx.doi.org/10.1016/j.scriptamat.2013.09.023.

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Becker, Dina. "Wear of nanostructured composite tool coatings." Wear 304, no. 1-2 (July 2013): 88–95. http://dx.doi.org/10.1016/j.wear.2013.04.019.

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Li, Yang, Huaqing Xie, and Jiangping Tu. "Nanostructured SnS/carbon composite for supercapacitor." Materials Letters 63, no. 21 (August 2009): 1785–87. http://dx.doi.org/10.1016/j.matlet.2009.05.036.

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Benea, Lidia, Pier Luigi Bonora, Alberto Borello, Stefano Martelli, François Wenger, Pierre Ponthiaux, and Jacques Galland. "Composite Electrodeposition to Obtain Nanostructured Coatings." Journal of The Electrochemical Society 148, no. 7 (2001): C461. http://dx.doi.org/10.1149/1.1377279.

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Seema, Syeda, and M. V. N. Ambika Prasad. "Dielectric Spectroscopy of Nanostructured Polypyrrole-NiO Composites." Journal of Polymers 2014 (May 4, 2014): 1–5. http://dx.doi.org/10.1155/2014/950304.

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Conducting polypyrrole-nickel oxide (polypyrrole-NiO) composites were synthesized by in situ deposition technique by placing different weight percentages of NiO powder (10, 20, 30, 40, and 50%) during the polymerisation of pyrrole. The polypyrrole-NiO composites were later characterised with Fourier transform infrared spectroscopy (FTIR) which confirms the presence of polypyrrole in the composite. AC conductivity was studied in the frequency range from 102 to 107 Hz. From these studies it is found that AC conductivity remains constant at low frequency and increases rapidly at higher frequency, which is the characteristic behavior of disordered materials. The dielectric behavior of these composites was also investigated in the frequency range 102–107 Hz. It is observed from these studies that the dielectric constant and dielectric tangent loss decrease exponentially with frequency. The composites exhibit a low value of dielectric loss at higher frequency.

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Journal articles on the topic 'Nanostructured composite'

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