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Yamamoto, Tetsuya, Yuya Takahashi i Naoya Toyoda. "Dispersion of Nano-materials in Polymer Composite Materials". MATEC Web of Conferences 333 (2021): 11003. http://dx.doi.org/10.1051/matecconf/202133311003.
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Polymer composites materials are the subject of extensive studies because of their novel properties compared with their constituent materials. Dispersion stability of sub-micron sized particles in the medium is important from the point of colloidal views. In the present study, dispersion of nano-materials in the matrix polymer is one of the most important problems to enhance their mechanical properties. We tackled this problem to carry out surface modification of the nano-materials, such as carbon nano tubes (CNTs), using amphiphilic polymers, polyNvinylacetamide (PNVA), synthesized thorough radical polymerization. Hydrogen bond worked between PNVA onto the modified nano-materials and hydrophilic matrix, such as polyvinyl alcohol (PVA), to enhance surface adhesions and dispersions of the nano-materials in the matrix. As a result, the mechanical properties of their composites materials were strengthened. When CNTs were used in PVA, the transparency of the composite was also increased due to improvement of their dispersions. In addition, if the CNTs formed the networks in the composites, the highly conductive and transparent polymer composite films were fabricated.
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Yamamoto, Tetsuya, Yuya Takahashi i Naoya Toyoda. "Dispersion of Nano-materials in Polymer Composite Materials". MATEC Web of Conferences 333 (2021): 11003. http://dx.doi.org/10.1051/matecconf/202133311003.
Pełny tekst źródłaStreszczenie:
Polymer composites materials are the subject of extensive studies because of their novel properties compared with their constituent materials. Dispersion stability of sub-micron sized particles in the medium is important from the point of colloidal views. In the present study, dispersion of nano-materials in the matrix polymer is one of the most important problems to enhance their mechanical properties. We tackled this problem to carry out surface modification of the nano-materials, such as carbon nano tubes (CNTs), using amphiphilic polymers, polyNvinylacetamide (PNVA), synthesized thorough radical polymerization. Hydrogen bond worked between PNVA onto the modified nano-materials and hydrophilic matrix, such as polyvinyl alcohol (PVA), to enhance surface adhesions and dispersions of the nano-materials in the matrix. As a result, the mechanical properties of their composites materials were strengthened. When CNTs were used in PVA, the transparency of the composite was also increased due to improvement of their dispersions. In addition, if the CNTs formed the networks in the composites, the highly conductive and transparent polymer composite films were fabricated.
3
Boyko, Yu I. "Contact relaxation phenomena in nano-structured composite materialsContact relaxation phenomena in nano-structured composite materials". Functional materials 22, nr 2 (30.06.2015): 162–68. http://dx.doi.org/10.15407/fm22.02.162.
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Hu, Haitao, Xiaohong Zhang, Dingping Zhang, Junguo Gao, Chunxiu Hu i Yayun Wang. "Study on the Nonlinear Conductivity of SiC/ZnO/Epoxy Resin Micro- and Nanocomposite Materials". Materials 12, nr 5 (5.03.2019): 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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Okino, Fujio, i Michiya Ota. "Nano-C/C composite materials". TANSO 2006, nr 223 (2006): 206–14. http://dx.doi.org/10.7209/tanso.2006.206.
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NAKA, Kensuke. "Organic-Inorganic Nano-Composite Materials". Kobunshi 54, nr 4 (2005): 254. http://dx.doi.org/10.1295/kobunshi.54.254.
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Saber, O., i A. A. Al Jaafari. "Nano-hybrid materials and nano-composite materials based on PVA". International Journal of Nano and Biomaterials 2, nr 1/2/3/4/5 (2009): 184. http://dx.doi.org/10.1504/ijnbm.2009.027712.
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Tiebao, Wang, Cui Chunxiang, Wang Xiaodong i Li Guobin. "Fabrication of Nano-Ce and Application of Nano-Ce in Fe Matrix Composites". Journal of Nanomaterials 2010 (2010): 1–5. http://dx.doi.org/10.1155/2010/768251.
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It is expatiated that nano-Ce is fabricated by the direct sedimentation method. The components and particles diameter of nano-Ce powders are analyzed by XRD and SEM . The thermodynamic analysis and acting mechanism of nano-Ce with Al in Fe matrix composites are researched, which shows that the reaction is generated between Ce and Al in the composite, that is, 3Ce+4Al2A +3[Ce], which obtains A and active [Ce] during the sintering process. The active [Ce] can improve the performance of Ce/Fe matrix composites. The suitable amount of Ce is about 0.05% in Ce/Fe matrix composites. SEM fracture analysis shows that the toughness sockets in nano-Ce/Fe matrix composites are more than those in no-added nano-Ce composites, which can explain that adding nano-Ce into Fe matrix composite, the toughness of the composite is improved significantly. Applied nano-Ce to Fe matrix diamond saw blades shows that Fe matrix diamond saw blade is sharper and of longer cutting life than that with no-added nano-Ce.
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Zhang, Peng, Qingfu Li, Juan Wang, Yan Shi, Yuanxun Zheng i Yifeng Ling. "Effect of Nano-Particle on Durability of Polyvinyl Alcohol Fiber Reinforced Cementitious Composite". Science of Advanced Materials 12, nr 2 (1.02.2020): 249–62. http://dx.doi.org/10.1166/sam.2020.3680.
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In this study, the influence of nano-particle on flowability and durability of polyvinyl alcohol (PVA) fibers reinforced cementitious composite containing fly ash was evaluated. In the cementitious composite, Portland cement was replaced with 1.0%, 1.5%, 2.0% and 2.5% (by weight) of nano-particles. Two kinds of nano-particle of SiO2 and CaCO3 nano-particles were adopted in this study. PVA fibers were incorporated to the composite at a dosage of 0.9% (by volume). The flowability of the fresh cementitious composite was assessed using slump flow measurements. The durability of hardened cementitious composite includes carbonation resistance, permeability resistance, cracking resistance as well as freezing-thawing resistance, which were evaluated by the depth of carbonation, the water permeability height, cracking resistance ratio of the specimens, and relative dynamic elastic modulus of samples after freeze-thaw cycles, respectively. Our results showed incorporation of nano-particles had a little disadvantageous effect on flowability of PVA fiber reinforced cementitious composite, and the flowability of the fresh mixtures decreased with increases in the nano-particles content. The decrease in flowability of cementitious composite resulted by nano-SiO2 particles is more remarkable than nano-CaCO3 particles. The addition of both nano-SiO2 and nano-CaCO3 particles significantly improved the durability of PVA fiber reinforced cementitious composite. However, the improvement of nano-SiO2 on durability is much better than that of nano-CaCO3. When the amount of SiO2 nano-particle was less than 2.5%, the durability of cementitious composites increased with nano-SiO2 content. The microstructure of PVA fiber reinforced cementitious composite becomes much denser due to filler effect of nano-particle and generation of particles of hydrated products C–S–H gels. Both of SiO2 and CaCO3 nano-particle improved the microstructure of PVA fiber reinforced cementitious composite, and nano-SiO2 particles might be more beneficial for PVA fibers to play the role of reinforcement than nano-CaCO3 particles in the composites.
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Selvam, R., S. Ravi i K. Balasubramanian. "Mechanical Testing of Plastoceramic (nPMC Sheet- SiC Reinforced Polyester Nano Composite)". International Journal of Engineering & Technology 7, nr 3.12 (20.07.2018): 1195. http://dx.doi.org/10.14419/ijet.v7i3.12.17785.
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Concept of nano-composite Technology has gained greater momentum in its recent engineering applications. Recent works on Nano-composite technology have proved the viability of its use and its importance in modern engineering fields of applications particularly in the field of materials and manufacture. When dissimilar materials are used with different compositions to obtain newer nano- composite materials, it has lead to the production of novel products with unique properties. In the present study, the ceramic material SiC is used as reinforcement owing to its superior properties such as hardness, thermal conductivity and strength. And this has paved the way for using it in the making of polyester nano- composite sheet (nPMC) with aforementioned properties. Fabrication and characterization of Nano-composite sheet is carried out using a weight ratio of 30% so as to understand the molecular structure and mechanical behavior under external load. The synthetic procedure and characterization used in this study has made it possible to obtain SiC nano particles reinforced polyester nano-composites (nPMC) film with good thermal strength and chemical homogeneity over the traditional composite.
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Ujah, Chika Oliver, Daramy Vandi Von Kallon i Victor Sunday Aigbodion. "Tribological Properties of CNTs-Reinforced Nano Composite Materials". Lubricants 11, nr 3 (22.02.2023): 95. http://dx.doi.org/10.3390/lubricants11030095.
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High modulus of about 1 TPa, high thermal conductivity of over 3000 W/mK, very low coefficient of thermal expansion (CTE), high electrical conductivity, self-lubricating characteristics and low density have made CNTs one of the best reinforcing materials of nano composites for advanced structural, industrial, high strength and wear-prone applications. This is so because it has the capacity of improving the mechanical, tribological, electrical, thermal and physical properties of nanocomposites. So, this study is aimed at providing the latest discoveries on the tribological behavior of CNTs-reinforced composites. The composites reviewed included metal matrix composites (MMCs), polymer matrix composites (PMCs) and ceramic matrix composites (CMCs) reinforced with CNTs. Their tribological characteristics, uses, production challenges, conclusion and recommendations are presented. The work presented the best technique to disperse CNTs on matrices to avoid its agglomeration, since agglomeration is one of the major challenges in reinforcing with CNTs. It was discovered that ball milling destroys the outer walls of CNTs but recommended that ultrasonication and functionalization before ball milling eliminate this adverse effect of ball milling. In addition, it was discovered that addition of CNTs to composite matrices improved the wear resistance, reduced the wear volume, decreased the coefficient of friction (COF) and provided self-lubricating effect on MMCs, PMCs and CMCs.
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Jahangiri, Ali Asghar, i Yasser Rostamiyan. "Mechanical properties of nano-silica and nano-clay composites of phenol formaldehyde short carbon fibers". Journal of Composite Materials 54, nr 10 (25.09.2019): 1339–52. http://dx.doi.org/10.1177/0021998319877225.
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The mechanical properties of phenol formaldehyde (phenolic novolac) and short carbon fiber T300 polymer-based nano-composites-reinforced with nano-silica and nano-clay particles have been studied experimentally. By increasing the weight percentage of the short carbon fiber in the phenol formaldehyde, the strength of the composite increases, but its plastic deformation is severely limited. Also, in the case of composite reinforced with nano-silica particles, the tensile and flexural strength of the composite with the increase in the weight percentage of the nano-silica increase by 1% to 3%, whereas with the nano-clay particles, the tensile and flexural strength of the composite decrease by 1% to 3%. It is composite with 1% weight percentage of the nano-clay particle which has the highest strength in comparison to the other samples. Regardless of the type of corrosive solution, the composite strength decreases significantly over 25 days. However, with an increase in the duration from 25 days to 45 days, a slight change has been observed. The outcomes indicate that the corrosion of PF/CF40% composites and the composite reinforced with silica nanoparticles are higher corrosion rate in acid than in salt solution. In contrast, the nano-clay composite has more corrosion in salt solution. Furthermore, the analysis of the fracture surface of samples done by SEM microscopy shows reduction of the porosity in the case of using nanoparticles.
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Dayı, Burak, i Fikri Öcal. "Evaluation of the effects of whitening toothpaste containing nanohydroxyapatite on surface roughness and color change in restorative materials". PeerJ 11 (14.07.2023): e15692. http://dx.doi.org/10.7717/peerj.15692.
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Background The effects of whitening toothpastes containing nanohydroxyapatite on the surfaces of restorative materials are not well known. This study evaluated the changes in surface roughness and color of coffee-stained restorative materials after brushing with nanohydroxyapatite and other whitening toothpastes. Methods Disc-shaped specimens were formed using microhybrid, nanohybrid, and supra-nano-filled composite (n = 30) and stained with a coffee solution. A brushing simulation was applied with toothpastes containing nanohydroxyapatite (Dentiste Plus White), perlite (Signal White System) and hydrogen peroxide (Colgate Optic White) for 7, 15, and 30 days. Color and surface roughness measurements were taken before and after brushing. Color change (∆E00) was calculated using the CIEDE2000 system. Results Supra-nano-filled composite-Dentiste Plus White, supra-nano-filled composite-Colgate Optic White, and nanohybrid composite-Signal White System were the groups with the greatest color change observed on the 7th, 15th, and 30th days, respectively. The smallest color change was seen in the microhybrid composite-Signal White System, microhybrid composite-Dentiste Plus White, and nanohybrid composite-Dentiste Plus White groups on the 7th, 15th, and 30th days, respectively. No significant surface roughness changes were observed in the nanohybrid composite-Dentiste Plus White, supra-nano-filled composite-Colgate Optic White, supra-nano-filled composite-Dentiste Plus White, or supra-nano-filled composite-Signal White System groups. Conclusions Whitening toothpaste containing nanohydroxyapatite provided a high degree of color change in the short term and did not create significant surface roughness in nanohybrid or supra-nano-filled composites.
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Liu, Yue, Chuan Zhen Huang, Han Lian Liu, Bin Zou, Peng Yao i Liang Xu. "Effect of Nano-Additives on Microstructure and Mechanical Properties of Ti(C,N)-TiB2-WC Composite Ceramic Cutting Tool Materials". Key Engineering Materials 589-590 (październik 2013): 337–41. http://dx.doi.org/10.4028/www.scientific.net/kem.589-590.337.
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Ti(C,N)-TiB2-WC composite ceramic cutting tool materials with nano-scale additives Ni and Mo, and micro-scale additives Ni and Mo as sintering aids were sintered respectively at a temperature of 1550 °C for holding time of 1hour in vacuum by a hot-press technique. The effects of nano-scale additives Ni and Mo, and micro-scale additives Ni and Mo on microstructure and mechanical properties of composites were compared and investigated. It is concluded that the wettability of nano-scale Ni and Mo to the composites is better than that of micro-scale Ni and Mo. The nano-scale whiskers were found in the composite ceramic tool materials with nano-scale additives. The addition of nano-scale Ni and Mo instead of micro-scale Ni and Mo could make the flexural strength and fracture toughness of Ti(C, N)-TiB2 –WC composites have a promotion, but could not make the hardness of the composites increase in this study.
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S. Nasrat, Loai, Berlanty A. Iskander i Marina N. Kamel. "Carbon Nanotubes Effect for Polymer Materials on Break Down Voltage". International Journal of Electrical and Computer Engineering (IJECE) 7, nr 4 (1.08.2017): 1770. http://dx.doi.org/10.11591/ijece.v7i4.pp1770-1778.
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Epoxy resin composites reinforced to different types of carbon nano-particles have been fabricated. Carbon black (20, 30 and 40 wt. %), graphene (0.5 to 4 wt. %) and carbon nanotubes (CNT) (0.5 to 2 wt. %) were added with different weight percentages to epoxy. The dielectric strength of composites was tested in several conditions such as (dry, wet, low salinity and high salinity). The mechanical characterization showed that the nano-composite Polymer enhanced by using these particles in the tensile strength. Thermal gravimetric analysis shows effect of these nano-particles on the thermal structure of epoxy resin. Scanning Electron Microscopic test is used to characterize the dispersion of carbon nano-particles and to analysis the fractured parts in the nano scale.
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Savelieva, K. V., O. G. Dashko i Y. V. Simchuk. "Plane waves in nano-composite materials". Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, nr 1 (2019): 198–201. http://dx.doi.org/10.17721/1812-5409.2019/1.46.
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The propagation of plane waves in a hyper-elastic medium is theoretically investigated. Two methods of research were used: the method of slowly variable amplitudes and the method of perturbations (successive approximations). The results obtained by these methods are analyzed. The wave interaction in nanocomposite materials is studied. A theoretical study of the cubically nonlinear elastic interaction of plane harmonic waves is carried out for a material whose nonlinear properties are described by the Murnaghan elastic potential. The solution for self-generation of the longitudinal wave is obtained by the method of slowly varying amplitudes. The interaction of transverse horizontally and vertically polarized harmonic waves are studied using the perturbing method. The pumping of energy between different harmonics of a longitudinal wave and various types of transverse waves is described analytically. The results of numerical analysis for various types of nanocomposite materials are presented.
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Constantinescu, M., L. Dumitrache, D. Constantinescu, E. M. Anghel, V. T. Popa, A. Stoica i M. Olteanu. "Latent heat nano composite building materials". European Polymer Journal 46, nr 12 (grudzień 2010): 2247–54. http://dx.doi.org/10.1016/j.eurpolymj.2010.09.007.
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Wang, Zheng, Guangjun Zhang i Min Yuan. "Nano-Silicon Dioxide-Optimized Cementitious Composite Material in the Restoration of Concrete Cracks in House Building". Science of Advanced Materials 13, nr 11 (1.11.2021): 2167–77. http://dx.doi.org/10.1166/sam.2021.4139.
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This study aimed to investigate the restoration performance of nanocomposite materials used in house building. The ethyl orthosilicate was used as raw material, the sol–gel method was adopted to synthesize nano-silicon dioxide (SiO2), and the doped nano-SiO2 cementitious composite material was prepared. Then, the mechanical properties of the cementitious composite material based on different nano-SiO2 content was analysed through the characterization and performance test. The results showed that the nano-SiO2 prepared this time had regular crystal phases, small particle size, and certain thermal stability, with fully developed crystal grains. By analysing the mechanical properties of nano-SiO2 doped cementitious composites, it was found that the initial setting time and final setting time both showed an upward trend when the doped content of nano-SiO2 was less than 3%. Besides, the initial setting time and final setting time of cementitious composites decreased when the content was 3%–5%. The fluidity analysis indicated that the fluidity of cementified composites gradually dropped with the growth of nano-SiO2 content. The test results of mechanical properties of cementitious composites doped with nano-SiO2 revealed that the flexural strength and compressive strength of cementitious composites presented a trend of first rising and then falling, as the nano-SiO2 content rose. Shrinkage test results showed that the shrinkage rate of the gel composites increased with the growth of duration. The specific surface area and pore ratio measurement results indicated that the specific surface area of the cementitious composite doped with nano-SiO2 was 33.42 m2/g, and the porosity was small. In conclusion, the nano-SiO2-doped cementitious composite material synthesized in this study had good mechanical properties and could be applied in the repair of concrete cracks in house building.
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Mahenran, Thayumanavan, i Vijaya Kumar Kutty Nadar Rajammal. "Mechanical and Morphological Investigation of Aluminium 7075 Reinforced with Nano Graphene / Aluminium Oxide / Inconel Alloy 625 Using Ultrasonic Stir Casting Method". Revue des composites et des matériaux avancés 32, nr 4 (31.08.2022): 181–89. http://dx.doi.org/10.18280/rcma.320403.
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Aluminium Hybrid Metal Matrix Nano Composites (AHMMNCs) are finding widespread use in the aerospace, marine, defence, and automotive industries due to its high stiffness, high strength-to-weight ratio, and outstanding wear resistance. Hybrid nano composite materials are commonly used in engineering applications due to their proper mechanical organisation. Mechanical property improvement of hybrid nano composites is now a prominent field of research in materials and industrial technology. Aluminium alloy 7075 was reinforced with 0.5, 1.5%, and 2.0 wt. percent of nano-graphene (20-30nm), 2,4,6,8 wt percent of aluminium oxide (50m), and 2,4,6,8 wt percent of Inconel alloy 625 and 1wt percent of magnesium utilising an ultrasonic stir casting process in this study. Mechanical characteristics of the hybrid nano-composite material were evaluated using tension, compression, hardness, and flexural tests. SEM was used for morphology inquiry examination.
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Naito, Makio, Hiroya Abe i Kazuyoshi Sato. "Nanoparticle Bonding Technology for Composite Materials". Advances in Science and Technology 45 (październik 2006): 1704–10. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1704.
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Nanoparticle bonding technology can present a promising method for nano/micro structural controls of composite particles as well as composite materials. The nanoparticle bonding can be well conducted by making use of the unique properties of nanoparticle surface at lower temperature without any binder in dry phase. In this paper, the concept of nanoparticle bonding technology is introduced. The examples of nano/micro structural controls of particles including composite particles and the composite materials are shown.
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Sun, Kai, Ping Zhu, Pinliang Zhang, Qiang Zhang, Puzhen Shao, Zhijun Wang, Wenshu Yang i in. "Dispersion and Preparation of Nano-AlN/AA6061 Composites by Pressure Infiltration Method". Nanomaterials 12, nr 13 (30.06.2022): 2258. http://dx.doi.org/10.3390/nano12132258.
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Nanomaterials play an important role in metal matrix composites (MMC). In this study, 3.0 wt.%, 6.0 wt.%, and 9.0 wt.% nano-AlN-particles-reinforced AA6061 (nano-AlN/AA6061) composites were successfully prepared by pressure infiltration technique and then hot extruded (HE) at 500 °C. The microstructural characterization of the composites after HE show that the grain structure of the Al matrix is significantly refined, varying from 2 to 20 μm down to 1 to 3 μm. Nano-AlN particles in the composites are agglomerated around the matrix, and the distribution of nano-AlN is improved after HE. The interface between AA6061 and nano-AlN is clean and smooth, without interface reaction products. The 3.0 wt.% nano-AlN/AA6061 composite shows an uppermost yield and supreme tensile strength of 333 MPa and 445 MPa, respectively. The results show that the deformation procedure of the composite is beneficial to the further dispersion of nano-AlN particles and improves the strength of nano-AlN/AA6061 composite. At the same time, the strengthening mechanism active in the composites was discussed.
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Ma, Ting-Ting, Ze-Yu Niu, Jian-Guo Liao, Yan-Qun Li, Yi-Jia Guan, Jing-Xian Liu i Yu-Fen Xie. "Preparation, Mechanism and Bioactivity of Nano-Hydroxyapatite/Poly(DTH carbonate) Composite Bone Repair Material". Science of Advanced Materials 14, nr 6 (1.06.2022): 1065–74. http://dx.doi.org/10.1166/sam.2022.4297.
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A novel nano-hydroxyapatite/poly(desaminotyrosyl-tyrosin-hexyl ester) carbonate composites bone cement was prepared using nano-hydroxyapatite and poly(desaminotyrosyl-tyrosin-hexyl ester) carbonate. The experimental results indicate that the compressive strength of the nano-hydroxyapatite/poly(desaminotyrosyl-tyrosinhexyl ester) carbonate composite bone cement which contained bone can reach 18.2 MPa, which can satisfy the repair demand of cancellous bone parts. Nano-hydroxyapatite and poly(desaminotyrosyl-tyrosinhexyl ester) carbonate are combined by hydrogen bonding. Calcium citrate is formed by reaction of Ca2+ in nano-hydroxyapatite with the carboxyl group in citric acid. The nano-hydroxyapatite/poly(desaminotyrosyltyrosin-hexyl ester) carbonate composite bone cement was soaked in simulated body fluid to form hydroxyapatite. The results of the cell culture experiment and animal implantation indicated that nano-hydroxyapatite/poly(desaminotyrosyl-tyrosin-hexyl ester) carbonate composite bone cement had good biocompatibility and osteogenesis capability. This study is useful for the development of nanohydroxyapatite/ poly(desaminotyrosyl-tyrosin-hexyl ester) carbonate composite materials in the field of bone repair.
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Lv, Xin Ying, Yong Sun, Zhi Cheng Jiang, Yan Hua Zhang i Ming Wei Di. "Mechanical Property of Nano-Particles Reinforced Epoxy Resin Composite Materials". Advanced Materials Research 181-182 (styczeń 2011): 99–102. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.99.
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The two kinds of composites, including nano-nitrile butadiene rubber (NBR)/epoxy resin (EP) and nano-acrylate/EP composites were prepared with the three-roll mill. The effect of nano-particles on the mechanical property of epoxy resin composites were investigated by tensile strength testing. SEM images were taken to characterize the decentralization of the nano-particles in the composites. Mechanical testing results were presented that the epoxy nano-composites has the higher tensile strengths after filling with nano-particles. The tensile strength of EP composites has been significantly improved with nano-NBR content 4 wt. % and the nano-acrylate content 3 wt. %, respectively. SEM results indicated that nano-particles can be evenly dispersed in the epoxy resin by the three-roll mill dispersion method.
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Kim, Jin Bong, Sang Kwan Lee i Chun Gon Kim. "Comparison of Carbon-Based Nano Materials as Conductive Fillers for Single Layer Microwave Absorber". Key Engineering Materials 334-335 (marzec 2007): 837–40. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.837.
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In this paper, we have studied the permittivities of E-glass fabric/epoxy composite laminates containing three different types of carbon-based nano conductive fillers such as carbon black (CB), carbon nano fiber (CNF) and multi-wall carbon nano tube (MWNT). The measurements were performed for permittivities at the frequency band of 0.5 GHz ~ 18.0 GHz using a vector network analyzer with a 7 mm coaxial air line. The experimental results show that the complex permittivities of the composites depend strongly on the natures and concentrations of the conductive fillers. The real and imaginary parts of the complex permittivities of the composites were proportional to the filler concentrations. But, depending on the types of fillers and frequency band, the increasing rates of the real and imaginary parts with respect to the filler concentrations were all different. At the frequency of 10 GHz, the rates in the CNF filled composite and the MWNT filled composite were much larger then those of the CB filled composite. Between the CNF filled composite and MWNT filled composite, however, the former showed a little higher increasing rates than the other. These different rates can have great effect on the thickness in designing the single layer microwave absorbers. The effect of the different rates was examined by using Cole-Cole plots; the plot is composed of a single layer absorber solution line and permittivity lines of these three types of composites.
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Wang, Qian. "Preparation and Study of Novel Nano-Composite Coatings on the Surface of Plastic Moulds". Advanced Materials Research 311-313 (sierpień 2011): 344–47. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.344.
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Compared with ordinary coatings, nano-composite coating usually has a higher hardness and better wear and corrosion resistance. As coating materials, the nano-CeO2/Zn composites were prepared by nano-CeO2 and Zn powder. The microstructure was investigated by XRD and FESEM. The corrosion resistance and hardness of nano-CeO2/Zn composites with different amount of nano-CeO2 were comparatively studied. The results show that the metal corrosion resistance, hardness and density of the composites may be improved significantly by addition of nano-CeO2, and the optimal amount of nano-CeO2 is 1%.
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Msebawi, Muntadher Sabah, Zulkiflle Leman, Shazarel Shamsudin, Suraya Mohd Tahir, Che Nor Aiza Jaafar, Azmah Hanim Mohamed Ariff, Nur Ismarrubie Zahari i Mohammed H. Rady. "The Effects of CuO and SiO2 on Aluminum AA6061 Hybrid Nanocomposite as Reinforcements: A Concise Review". Coatings 11, nr 8 (15.08.2021): 972. http://dx.doi.org/10.3390/coatings11080972.
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Hybrid composites are obtained by embedding multiple micro and nano reinforcements into the matrix materials. These hybrid composites are helpful to obtain the useful properties of matrix and reinforcement materials. Aluminum matrix is one the most common matrix materials due to its excellent thermal and electrical properties. This review covers various aspects of nanoparticle-reinforced Al hybrid composites. Solid-state recycling of Al only consumes around 5% of the energy utilized in the conventional extraction and recycling methods. This review revolves around the induction of silica and copper oxide nanoparticles into the solid-state recycled Al matrix material to form the hybrid composite. These nanoparticles enhance stiffness, toughness, and high temperature stability for Al hybrid composites. A detailed analysis was carried out for AA6061-grade Al matrix materials along with the silica and copper oxide nanoparticles. The present work focused on the effects of nano silica and nano copper oxide particle reinforcements on Al-based composite manufactured via hot extrusion process. The composite fabrication through solid-state recycling is discussed in detail. A detailed analysis for the effects of volume fraction and wt.% of CuO and SiO2 reinforcement particles was carried out by various characterization techniques. A detailed comparison in terms of mechanical performance of Al-based composites with the addition of nano silica and nano copper oxide particles is presented here to investigate the efficiency and performance of these particles.
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Alhakeem, Mohammed Ridha H. "An Overview of modeling of nano-composite materials and structures". Brilliance: Research of Artificial Intelligence 2, nr 3 (3.09.2022): 145–61. http://dx.doi.org/10.47709/brilliance.v2i3.1703.
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The research conducted by many scientists and engineers on nanocomposite materials and continuous systems made from such materials will be reviewed historically in this article by the writers. Nano composites are a form of well-known composite material that has been improved by adding nanoscale fibers and/or particles for reinforcement. These materials may be more appropriate for industrial applications that require material qualities that are noticeably improved. In other words, because of the improved properties of materials at the nanoscale, the material properties of nanocomposites are superior to those of macroscale composites. Designers are using these materials more frequently than traditional composite materials as constituent parts in aerospace, mechanical, and automotive applications. In order to forecast how buildings made of these materials will behave under actual operating conditions, it is crucial to be aware of the research that has been done in this field. The mechanical analyses carried out on various nanocomposite structures, such as those reinforced with carbon nanotubes (CNTR), graphene (GR), graphene platelets (GPLR), graphene oxide (GOR), and multi-scale hybrid (MSH) nano-composite ones, will be reviewed in the sections that follow, along with the most significant aspects of the suggested scientific activities.
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Shalaby, S. M., A. E. Kabeel, A. R. El Sayed i H. F. Abosheiasha. "Improvement of Thermal Conductivity of Paraffin Wax Using High Conductive Nano-Materials". International Journal of Engineering and Technology 14, nr 4 (listopad 2022): 84–88. http://dx.doi.org/10.7763/ijet.2022.v14.1208.
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Paraffin wax (PW) is commonly used as latent heat storage material in solar energy systems. The low thermal conductivity of the PW is considered the main drawback when it is used as thermal energy storage medium. In order to overcome this drawback, tens types of high conductive nano-materials are added to paraffin wax to improve its thermal conductivity. In this work, nanoparticles of CuO, and TiO2 were individually added to paraffin wax with concentrations 1, 2 and 3%. The thermal properties of pure paraffin wax, PW/CuO and PW/TiO2 nano-composites with different mentioned concentrations were measured at different temperature. The paraffin wax/TiO2 showed higher thermal conductivity compared to paraffin wax/CuO nano-composite and pure paraffin.
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Chmielewski, Marcin, Remigiusz Michalczewski, Witold Piekoszewski i Marek Kalbarczyk. "Tribological Behaviour of Copper-Graphene Composite Materials". Key Engineering Materials 674 (styczeń 2016): 219–24. http://dx.doi.org/10.4028/www.scientific.net/kem.674.219.
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In the present study, the influence of the volume fraction of graphene on the tribological properties of copper matrix composites was examined. The composites were obtained by the spark plasma sintering technique in a vacuum. The designed sintering conditions (temperature 950°C, pressing pressure 50 MPa, time 15 min) allowed obtaining almost fully dense materials. The tribological behaviour of copper-graphene composite materials was analysed. The tests were conducted using a CSM Nano Tribometer employing ball-on-plate tribosystem. The friction and wear behaviour of copper-graphene composite materials were investigated. An optical microscope, interferometer, and scanning electron microscope were used to analyse the worn surfaces. In friction zone, the graphene acts as a solid lubricant, which results in the increase in the content in the composites positively influencing the tribological characteristics of the steel- Cu-graphene composite.
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Wang, Yongliang, Baoqiang Liu, Ruiyang Chen, Yunfei Wang, Zhidong Han, Chunfeng Wang i Ling Weng. "Synergistic Effect of Nano-Silica and Intumescent Flame Retardant on the Fire Reaction Properties of Polypropylene Composites". Materials 16, nr 13 (30.06.2023): 4759. http://dx.doi.org/10.3390/ma16134759.
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Silica nanoparticles (nano-silica) were used as synergistic agents with ammonium polyphosphate (APP) and pentaerythritol (PER) to enhance flame retardancy of polypropylene (PP) in this research. The composites were prepared using a melt-mixing method. The influences of nano-silica on the fire performance of composites were thoroughly discussed, which promotes understanding of nano-silica on the flame-retardant performance of polypropylene composite. Scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS) results indicated that the nano-silica with a diameter of about 95 ± 3.9 nm were dispersed favorably in the composite matrix, which might elevate its synergistic effect with intumescent flame retardant and improve the flame retardancy of polypropylene composite. The synergistic effects between nano-silica and intumescent flame retardant on PP composites were studied using the limiting oxygen index (LOI), UL-94 test, and cone calorimeter test (CCT). The total amount of flame retardant was maintained at 30%. When the dosage of nano-silica was 1 wt.%, the LOI value of PP/IFR/Si1.0 composite reached 27.3% and its UL-94 classification reached V-1. Based on the parameters of the CCT, the introduction of nano-silica induced composites with depressed heat release rate (HRR) and peak heat release rate (PHRR). The PHRR of PP/IFR/Si0.5 was only 295.8 kW/m2, which was 17% lower than that of PP/IFR. Moreover, the time to PHRR of PP/IFR/Si0.5 was delayed to 396 s, which was about 36 s later than that without nano-silica. EDS was used to quantitatively analyze the distribution of silica in charred residue. The EDS results indicated that the silica tended to accumulate on the surface during the fire. The surface accumulation characteristic of silica endows it with the enhanced flame-retardant properties of polypropylene composite at a very small dosage (as low as 1 wt.%).
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Kojima, Yoshitsugu. "Research and Development of Nano-Composite Materials for Hydrogen Storage". Materials Science Forum 654-656 (czerwiec 2010): 2935–38. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2935.
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Hydrides with light elements such as MgH2, LiH, NH3 and NH3BH3 are known as high hydrogen containing materials. However, the high work temperature and the slow reaction rate limit the practical application of hydride systems. Those properties can be improved by the nano-composite materials. The nano-composite materials for hydrogen storage encompass a catalyst and composite hydrides at the nanometer scale. The catalyst increases reaction rate. The thermodynamic stability of the nano-composite materials can be controlled by the composite hydrides. In addition, the hydrogen absorption kinetics is accelerated by the nano-size materials and they may change the thermodynamic stability of the materials. In this study, we reviewed our experimental results on hydrogen storage properties of light weight nano-composite materials. The Mg-based nano-composite material with Nb2O5 showed excellent kinetics as compared with that of Mg. The Li-Mg-N-H system absorbed and desorbed above 5.5 mass % of H2 at 423K (8LiH ＋ 3Mg(NH2)2 3Li2.667MgN2H1.333＋8H2). We found that the H2 absorption and desorption of the MH-NH3 (M: Li, Na, K) system takes the following reaction path, MH + NH3 MNH2 + H2.
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Yadav, Ramkumar, i Anoj Meena. "Comparative study of thermo-mechanical and thermogravimetric characterization of hybrid dental restorative composite materials". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 236, nr 5 (21.01.2022): 1122–29. http://dx.doi.org/10.1177/14644207211069763.
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The purpose of the study is to create resin-based micro-nano particulates-filled dental restorative composite materials and investigate the influence of variable nano-hydroxyapatite filler concentration on their thermo-mechanical and thermogravimetric properties. Two series were created by combining silane treated nano-hydroxyapatite filler particles (wt.% of 0, 2, 4, 6, and 8) with foreign ceramic particles (alumina and titanium oxide). Each series consists of five compositions. For each dental composition, the amount of foreign ceramics (20 wt.%) remained constant. The dental composite samples were polymerized for 30 s on each side using a blue LED light. Thermo-mechanical and thermogravimetric analysis was performed at various temperatures range. At preliminary temperatures (30–40°C), the hybrid nano-hydroxyapatite-TiO2 dental composite filled with 8 wt.% nano-hydroxyapatite exhibited storage modulus (about 90 MPa) whereas nano-hydroxyapatite-Al2O3 dental composite filled with 8 wt.% nano-hydroxyapatite exhibited storage modulus (about 260 MPa). Themal stability of nano-hydroxyapatite-Al2O3 and nano-hydroxyapatite-TiO2 dental composite was 99.90% and 99.82% at 90°C, respectively. The glass phase, glass transition phase, and rubbery phase were observed at various temperatures. From the results, it revealed that Al2O3-nano-hydroxyapatite filled dental composite was observed significant than TiO2–nano-hydroxyapatite filled dental composite.
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Cilingir, Aylin, Alev Ozsoy, Meltem Mert Eren, Ozge Behram, Benin Dikmen i Mutlu Ozcan. "Mechanical properties of bulk-fill versus nanohybrid composites: effect of layer thickness and application protocols". Brazilian Dental Science 22, nr 2 (30.04.2019): 234–42. http://dx.doi.org/10.14295/bds.2019.v22i2.1719.
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Objective: The objective of this study was to evaluate the compressive strength, flexural strength and flexural modulus of high-viscosity, low-viscosity bulk-fill, and conventional nano-hybrid resin composite materials alone and when covered with nano-hybrid resin composite at different incremental thicknesses on the bulk-fill composites. Materials and Methods: Specimens (N=60) were fabricated from the following materials or their combinations (n=10 per group): a) conventional nano-hybrid composite Z550 (FK), b) high-viscosity bulk-fill composite (Tetric N Ceram-TBF), c) low-viscosity bulk-fill composite SDR (SDR), d) Sonicfill (SF), e) SDR (2 mm)+FK (2 mm), f) SDR (4 mm)+FK (4 mm). After 24 h water storage, compressive strength was measured in a universal testing machine (1 mm/min). Additional specimens (N=40) (25x2x2 mm3) were made from FK, TBF, SDR and SF in order to determine the flexural strength and the flexural modulus, (n=10) and subjected to three-point bending test (0.5 mm/min). Data were analyzed using one-way ANOVA and Tamhane’s T2 post-hoc tests (p<0.05). Results: The mean compressive strength (MPa) of the nano-hybrid composite (FK) was significantly higher (223.8±41.3) than those of the other groups (123±27 - 170±24) (p<0.001). SDR (4 mm)+FK (2 mm) showed significantly higher compressive strength than when covered with 4 mm (143±30) or when used alone (146±11) (p<0.05). The mean flexural strength (159±31) and the flexural modulus of FK (34±7) was significantly higher than that of the high- or low-viscosity bulk-fill composites (p<0.001). The mean flexural strength of SF (132±20) was significantly higher compared to TBF (95±25) (p<0.05). Conclusion: Bulk-fill resin composites demonstrated poorer mechanical properties compared to nano-hybrid composite but similar to that of SF. Increasing the thickness of low-viscosity bulk-fill composite (SDR) from 2 to 4 mm underneath the nano-hybrid composite (FK) can improve the mechanical properties of the bulk-fill composites. KeywordsBulk-fill composites; Compressive strength; Flexural modulus; Flexural strength; Mechanical properties.
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Leporatti, Stefano. "Polymer Clay Nano-Composites". Polymers 11, nr 9 (3.09.2019): 1445. http://dx.doi.org/10.3390/polym11091445.
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Clay–polymer composite materials is an exciting area of research and this Special Issue aims to address the current state-of-the-art of “Polymer Clay Nano-Composites” for several applications, among them antibacterial, environmental, water remediation, dental, drug delivery and others [...]
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Yadav, Govind, R. S. Rana, R. K. Dwivedi i Ankur Tiwari. "Development and Analysis of Automotive Component Using Aluminium Alloy Nano Silicon Carbide Composite". Applied Mechanics and Materials 813-814 (listopad 2015): 257–62. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.257.
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Composite materials are important engineering materials due to their outstanding mechanical properties. Composites are materials in which the desirable properties of separate materials are combined by mechanically binding them together. Each of the components retains its structure and characteristic, but the composite generally possesses better properties. Composite materials offer superior properties to conventional alloys for various applications as they have high stiffness, strength and wear resistance. The development of these materials started with the production of continuous-fiber-reinforced composites. The high cost and difficulty of processing these composites restricted their application and led to the development of discontinuously reinforced composites. The aim involved in designing metal matrix composite materials is to combine the desirable attributes of metals and ceramics. The addition of high strength, high modulus refractory particles to a ductile metal matrix produce a material whose mechanical properties are intermediate between the matrix alloy and the ceramic reinforcement. Metal Matrix Composites with Aluminum as metal matrix is the burning area for research now a days.
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Song, Kenan, Yiying Zhang, Navid Tajaddod i Marilyn L. Minus. "Application of the Electron Density Correlation Function for Structural Analysis of X-ray Scattering/Diffraction Information from Polymer-based Nano-Composites". MRS Proceedings 1754 (2015): 147–52. http://dx.doi.org/10.1557/opl.2015.760.
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ABSTRACTModern diffraction and scattering methods of X-ray radiation allow for multi-scale probing of the material morphology for both polymer-based composite films and fibers. These approaches and analyses tools can be used to map the makeup of individual grain structures in various polymer nano-composites in order to examine the effects of the fillers on nano-scale structural changes in the materials. The electron intensity correlation function, derived from Fourier transformations of the X-ray scattering pattern provides a path to analyze acquired data for space resolved domains. Here in this study, polymer-based nano-carbon composite systems are analyzed. The polymers used include polyvinyl alcohol, polyethylene, and polyacrilonitrile as matrix materials. The nano-carbon filler contribution to the grain size evolution is tracked by X-ray scattering/diffraction characterization. These results show that the relevant sizes of crystalline and amorphous domains within the lamellae structures correspond to the dispersion/distribution of the nano-filler in the composite materials. This work mainly illustrates an effective use of the correlation function to provide global morphological analysis in the composite system.
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Zhou, Hai Hua, i Yan Lin Song. "Green Plate Making Technology Based on Nano-Materials". Advanced Materials Research 174 (grudzień 2010): 447–49. http://dx.doi.org/10.4028/www.scientific.net/amr.174.447.
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Laser phototypesetting and computer to plate (CTP) technologies are widely used in print industry. These technologies are based on the complex photosensitive image process. The exposing and development processes result in waste of photosensitive materials and environment pollution. Green plate making technology is not based on photosensitive materials but nano-materials. The image process of the technology is to jet the nano-composite transfer printing material on super hydrophilic print plate with special nano and micro-structure. Then the oleophilic image area and hydrophilic non image area are formed by adjusting interface characters between the nano-composite transfer printing material and super hydrophilic print plate. The plate is used for printing without exposing and development. Without photosensitive image process, the technology has many advantages such as no operation in darkroom, simple process, environmental friendly and low cost. The key problems of print resolution and press life have been solved effectively by preparation of nano composite transfer printing material and super hydrophilic print plate. In this paper, the research process of the nano composite material and the print plate are presented.
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Aydoğuş, Osman, i Mehmet Turan Demirci. "Nano-hybridization effects of nano-silica and nano-graphene platelet on mechanical properties of E-glass/epoxy nanocomposites". Journal of Composite Materials 56, nr 5 (3.01.2022): 779–96. http://dx.doi.org/10.1177/00219983211065211.
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This study reveals the nano-hybridization effects of nano-graphene platelets (NGPs) and nano-silica (SiO2 nanoparticle), having different structural geometries on the mechanical properties, nano and micro-scale failure behaviors, and nanoscale fracture mechanisms of E-glass/epoxy composites. Tensile, three-point bending, and Charpy impact experiments were applied to determine the mechanical behaviors of 0.5 wt.% NGPs, 4 wt.% nano-silica and 0.5 wt.% NGPs + 4 wt.% nano-silica nanohybrid filled E-glass/epoxy and neat E-glass/epoxy composite samples. Failure of composite samples was examined by microscopy and SEM analysis. FTIR analyses were conducted to interpret the chemical and physical interactions between the nanoparticles and epoxy resin. Nano-hybridization exhibited the highest tensile strength and three-point flexural force for the composite samples. However, the NGPs filled nanocomposites also exhibited the best static tensile toughness and impact energy absorption. The experimental data showed that it was statistically significant as a result of the one-way ANOVA analysis. Remarkably, nano-hybridization of nano-silica and NGPs showed different fracture mechanisms at the nano and micro-scales.
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Abdelkarim, M. F., L. S. Nasrat, S. M. Elkhodary, A. M. Soliman, A. M. Hassan i S. H. Mansour. "Volume Resistivity and Mechanical Behavior of Epoxy Nanocomposite Materials". Engineering, Technology & Applied Science Research 5, nr 2 (20.04.2015): 775–80. http://dx.doi.org/10.48084/etasr.536.
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Electrical and mechanical properties of polymer composite materials are investigated through the determination of resistivity and hardness for composites samples. Epoxy composite samples have been prepared with different concentrations of certain inorganic fillers such as; Titanium dioxide (TiO2) and Silica (SiO2), of various size (micro, nano and hybrid) to study the electrical and mechanical behavior. The volume resistivity reaches 3.23×1014 ohm.cm for the micro silica composite. Surface of composite material has been mechanically examined by hardness test. The results show that the resistivity of microcomposites and nanocmposites are increased with the decrease of filler concentration. But the resistivity of hybrid composites is increased with the increase of filler concentration. Maximum hardness value was obtained from hybrid silica composite with 0.1% filler concentration.
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Wei, Fengjun, Bingli Pan i Juan Lopez. "The tribological properties study of carbon fabric/ epoxy composites reinforced by nano-TiO2 and MWNTs". Open Physics 16, nr 1 (31.12.2018): 1127–38. http://dx.doi.org/10.1515/phys-2018-0133.
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Abstract A kind of carbon fabric/epoxy composite was successfully prepared with carbon fiber fabric as reinforced phase and epoxy resin as binder phase, then the nano-TiO2 and a hybrid system of TiO2/MWNTs was added into the carbon fabric/ epoxy composite matrix respectively to prepare a kind of nano-composite. The friction and wear properties of CF/EP composites under different load conditions have been studied in this article, during the study the effects of filler types and contents on the tribological properties were researched, at last the worn surfaces were investigated and the abrasion mechanism was discussed. The results showed that: whether filling the nano-TiO2 alone or mixing the TiO2/MWNTs, it was able to achieve a good effect on decreasing friction and reducing wear, and the optimum addition ratio of the nano-TiO2 particles was 3.0% , meanwhile 3.0% of nano-TiO2 and 0.4% of MWNTs could cooperate with each other in their dimension, and could show a synergistic effect on modifying the tribological properties of CF/EP composites, the coefficient of friction of the modified composites decreased by 20% and the wear life increased by more than 140% compared with that of pristine composite materials, in the process of friction and wear, the wear form of the composites materials varied from brittle rupture to abrasive wear gradually.
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Liu, Wen Yong, Yi Chen, Long Ouyang, Yue Jun Liu i Xi Hai Hao. "Processing and Mechanical Properties of Starch and PCL Composite Reinforced by Nano-SiO2". Advanced Materials Research 496 (marzec 2012): 134–37. http://dx.doi.org/10.4028/www.scientific.net/amr.496.134.
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The thermoplastic processing and mechanical properties of starch and polycaprolactone (PCL) composites reinforced by nano-silica (nano-SiO2) were studied. The results showed that the mechanical properties of the starch/PCL blends improved significantly with the increase of PCL. After the addition of nano-SiO2, the mechanical properties of the starch/PCL blends further improved. When the weight percent of nano-SiO2 was 1.8%, the mechanical properties of the SiO2/TPS/PCL composite were most excellent. By comparison with the starch/PCL (50/50) blends, the tensile strength of the SiO2/TPS/PCL composite with 1.8% SiO2 was increased by 20% and the elongation increased by 33%. Moreover, it was confirmed by rheological measurements that nano-SiO2 could interact with the composite materials, which results in the improvement of the mechanical strength of the TPS/PCL composites.
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Gadyal, M. A., i K. S. Venkatesh. "Synthesis of Polyaniline-Graphite Nano-Composites". Material Science Research India 12, nr 1 (8.04.2015): 85–88. http://dx.doi.org/10.13005/msri/120114.
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The polyaniline belongs to the group of electronically conducting polymers. The graphite is anisotropic, being a good electrical and thermal conductor within the layers. One of the more important groups of materials in our lives today is composite material. The nano-composites provide reinforcing efficiency because of their high aspect ratios In this paper, synthesis and characterization polyaniline- graphite as a novel eco-friendly nano-composite material is reported.
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Zhao, Dong Lin, Fa Luo i Wan Cheng Zhou. "Microstructure and Effective Modeling of the Microwave Permittivity of Nano SiC(N) Composite Powder". Advanced Materials Research 11-12 (luty 2006): 141–44. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.141.
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The nano SiC(N) composite powder was synthesized from hexamethyldisilazane ((Me3Si)2NH) (Me:CH3) by a laser−induced gas-phase reaction. The microwave permittivity of the nano SiC(N) composite powder and paraffin wax (or other dielectric materials) composites can be tailored by the content of this nano powder. The dissipation factors (tgδ) of the nano SiC(N) composite powder are high at the microwave frequencies. And ε′, ε″ and tgδ of composites increase with the volume filling factor (v) of nano SiC(N) powder. The nano SiC(N) composite powder would be a good candidate for microwave absorbing material and electromagnetic interface (EMI) shielding material. The classical effective medium functions can not effectively model the microwave permittivities of the SiC(N) nanocomposites. We found that the microwave permittivities of the nanocomposites can be effectively modeled using second-order polynomials. These polynomials are dependent only on the filling factor and are purely mathematical models. The ε′ and ε″ of nanocomposites can be effectively modeled using second-order polynomials (ε′, ε″=Av2+Bv+C).
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An, Chongwei, Hequn Li, Binshuo Yu, Xiaoheng Geng i Jingyu Wang. "Preparation and characterization of nano NC/HMX composite particles". Science and Engineering of Composite Materials 24, nr 1 (1.01.2017): 123–28. http://dx.doi.org/10.1515/secm-2014-0287.
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AbstractNano nitrocellulose/cyclotetramethylene tetranitramine (NC/HMX) composite particles were precipitated from their co-solutions by the spray drying method. The nano composite samples were characterized by scanning electron microscope, transmission electron microscope and X-ray diffraction. Impact sensitivity and thermal decomposition properties of nano composites were also measured and analyzed. Results show that the product particles are close to spherical in shape and range from 0.5 μm to 5 μm in size. In the product particles, β-HMX particles with size ranging from 50 nm to 100 nm are uniformly and discretely dispersed in NC binders. The drop height of nano NC/HMX composite particles (66.1 cm) is more than triple as high as that of raw HMX (21.6 cm), exhibiting considerably low impact sensitivity. Moreover, nano composite particles are easier to decompose and decomposed more rapidly than do raw HMX under the thermal stimulus due to the lower peak temperature and activation energy and higher reaction rate. Therefore, nano composites are expected to be candidates filled in high burning rate propellants.
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Goh, K. L., A. M. A. Huq, R. M. Aspden i D. W. L. Hukins. "Nano-Fibre Critical Length Depends on Shape". Advanced Composites Letters 17, nr 4 (lipiec 2008): 096369350801700. http://dx.doi.org/10.1177/096369350801700403.
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Nano-fibres in composite materials may not be cylindrical. A theoretical analysis shows that non-cylindrical nano-fibres have longer critical lengths leading to composites with different mechanical properties requiring a lower volume of reinforcing material.
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Prasong, Wattanachai, Paritat Muanchan, Akira Ishigami, Supaphorn Thumsorn, Takashi Kurose i Hiroshi Ito. "Properties of 3D Printable Poly(lactic acid)/Poly(butylene adipate-co-terephthalate) Blends and Nano Talc Composites". Journal of Nanomaterials 2020 (28.03.2020): 1–16. http://dx.doi.org/10.1155/2020/8040517.
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Biodegradable poly(lactic acid) (PLA) filaments have been widely used in the fused deposition modeling (FDM) 3D printing technology. However, PLA has low toughness and low thermal resistance that affects printability and restricts its industrial applications. In this study, PLA was compounded with 0 to 40 wt% of poly(butylene adipate-co-terephthalate) (PBAT) and varied content of nano talc at 0 to 40 wt% in a twin screw extruder. The compounds were reextruded to filaments using a capillary rheometer. PLA/PBAT blends and their composite filaments were printed with a FDM 3D printing machine. Morphology, rheological behaviour, thermal characteristic, surface roughness, and mechanical property of 3D printing of the blends and the composites were investigated. Complex viscosity of the blends and the composites increased with increase of the PBAT and the nano talc contents. The incorporation of the nano talc enhanced crystallization temperature and reduced the coefficient of volume expansion of the composites. It was found that the PLA/PBAT blends and composites were excellent in both printability and dimension stability at PBAT content 10-30 wt% and nano talc up to 10 wt%. Interestingly, it was possible to print the composite filaments at an angle up to 75° during the overhang test without a supporter. From the vertical specimens, the surface roughness improved due to the incorporation of the nano talc. Tensile strength of the blends and the composites decreased, whereas elongation at break increased when the PBAT and the nano talc contents were increased. The reduction of tensile strength was attributed to agglomeration of the PBAT dispersed phase and less adhesion between the nano talc and the matrix. It can be noted that the composite 3D printing product showed superior elongation at break up to 410% by adding nano talc 1 wt%. This result suggests that the ductile 3D printable PLA/PBAT blend and the PLA/PBAT-nano talc composite products can be prepared, which shows potential for the commercialized scale.
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Yokoi, Atsushi, Wai Kian Tan, Taichi Kuroda, Go Kawamura, Atsunori Matsuda i Hiroyuki Muto. "Design of Heat-Conductive hBN–PMMA Composites by Electrostatic Nano-Assembly". Nanomaterials 10, nr 1 (12.01.2020): 134. http://dx.doi.org/10.3390/nano10010134.
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Micro/nanoscale design of composite materials enables alteration of their properties for advanced functional materials. One of the biggest challenges in material design is the controlled decoration of composite materials with the desired functional additives. This study reports on and demonstrates the homogeneous decoration of hexagonal boron nitride (hBN) on poly(methylmethacrylate) (PMMA) and vice versa. The formation of the composite materials was conducted via a low environmental load and a low-energy-consuming, electrostatic nano-assembly method which also enabled the efficient usage of nano-sized additives. The hBN/PMMA and PMMA/hBN composites were fabricated in various size combinations that exhibited percolated and layer-oriented structures, respectively. The thermal conductivity behaviors of hBN/PMMA and PMMA/hBN composites that exhibited good microstructure were compared. The results showed that microstructural design of the composites enabled the modification of their heat-conducting property. This novel work demonstrated the feasibility of fabricating heat-conductive PMMA matrix composites with controlled decoration of hBN sheets, which may provide a platform for further development of heat-conductive polymeric materials.
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Qiu, Man De, Xiao Yan Wang, Yong Qing Zhai i Zi Hua Yao. "Preparation and Microanalysis Study of Nano-Hap/Cs-Chs Composites Materials". Advanced Materials Research 581-582 (październik 2012): 463–66. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.463.
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Nano-hydroxyapatite/chitosan-chondroitin sulfate composites materials with different weight ratios were prepared through liquid co-precipitation method. The nano-Hap、Hap/Cs and Hap/Cs-Chs composites materials under the same conditions preparation materials were researched By XRD, SEM and EDS respectively. The results show that nano-Hap particles with poorly crystallinity, the size is about 20nm, nano-Hap particles are spherical in sHape and dispersed uniformly, combined with relatively loose between particles, the small nano-particles aggregate into larger particles when the Hap composite with the Cs and Chs, nano-Hap were dispersed uniformly in the organic phase Cs and Chs, Hap particles have the trend to grow large in composites materials,crystal become more perfect, combination become relatively dense between particles, The composites materials were annealed at 700°C,Hap crystal particles become more perfect clear and larger with relatively loose between particles.EDS analysis showed that the compound before and after annealing of the material ratio of calcium had no influence, material does not contain any impurities,The ratio of calcium and phosphorus is about 1.75:1,Hap belonging to the type of calcium-rich
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Cao, Haiyao, Zaiji Zhan i Xiangzhe Lv. "Microstructure Evolution and Properties of an In-Situ Nano-Gd2O3/Cu Composite by Powder Metallurgy". Materials 14, nr 17 (2.09.2021): 5021. http://dx.doi.org/10.3390/ma14175021.
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Gadolinia (Gd2O3) is potentially attractive as a dispersive phase for copper matrix composites due to its excellent thermodynamic stability. In this paper, a series of 1.5 vol% nano-Gd2O3/Cu composites were prepared via an internal oxidation method followed by powder metallurgy in the temperature range of 1123–1223 K with a holding time of 5–60 min. The effects of processing parameters on the microstructure and properties of the composites were analyzed. The results showed that the tensile strength and conductivity of the nano-Gd2O3/Cu composite have a strong link with the microporosity and grain size, while the microstructure of the composite was determined by the sintering temperature and holding time. The optimal sintering temperature and holding time for the composite were 1173 K and 30 min, respectively, under which a maximum ultimate tensile strength of 317 MPa was obtained, and the conductivity was 96.8% IACS. Transmission electron microscopy observations indicated that nano-Gd2O3 particles with a mean size of 76 nm formed a semi-coherent interface with the copper matrix. In the nano-Gd2O3/Cu composite, grain-boundary strengthening, Orowan strengthening, thermal mismatch strengthening, and load transfer strengthening mechanisms occurred simultaneously.
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Cholleti, Eshwar Reddy, i Ian Gibson. "ABS Nano Composite Materials in Additive Manufacturing". IOP Conference Series: Materials Science and Engineering 455 (19.12.2018): 012038. http://dx.doi.org/10.1088/1757-899x/455/1/012038.
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