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1
Yatsyshen, Valeriy, Irina Potapova, and Vyacheslav Shipaev. "Polaritons in Nanocomposites of Metal Nanoparticles – Dielectric." NBI Technologies, no. 2 (October 2019): 39–53. http://dx.doi.org/10.15688/nbit.jvolsu.2019.2.7.
Повний текст джерелаАнотація:
The article studies the main characteristics of surface polaritons in composite nanomaterials. The authors consider composite media such as noble metal nanoparticles randomly distributed in a transparent dielectric matrix and build dispersion curves of polaritons in such nanocomposites. The paper shows calculating optical parameters of the surface polariton for several values of the radius of metal nanoparticles and the nanocomposite filling parameter. The authors also present the calculations of the complex refractive index for polaritons in composites with nanoparticles of different metals. In addition, the authors find the dependences of the real and imaginary parts of the complex refractive index of the nanocomposite on the normalized frequency for membranes with different thicknesses and calculate real and imaginary parts of dielectric constant for waves in several metals. Besides, the article provides an overview of important stages in the study of surface electromagnetic waves. It shows that the variation of the structure materials, size and concentration of nanoparticles opens wide possibilities for controlling the optical properties of composite mediums and their practical application. The considered nanocomposites are artificially created media whose material parameters can be controlled. The first method consists in changing the relative volume of the nanoparticles filling of the dielectric matrix. The second method consists in changing the dielectric constant of the nanocomposite matrix. The authors emphasize that the dielectric constant of the nanocomposite in this case acquires resonant properties in contrast to the permeability of the nanoparticles themselves.
2
Rasoolpoor, M., R. Ansari, and MK Hassanzadeh-Aghdam. "Dynamic behavior of particulate metal matrix nanocomposite plates under low velocity impact." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 1 (September 17, 2019): 180–95. http://dx.doi.org/10.1177/0954406219875781.
Повний текст джерелаАнотація:
The main purpose of this work is to investigate low velocity impact behavior of metal matrix nanocomposite plates reinforced with silicon carbide nanoscale particles. First, a micromechanical model is proposed to predict the effective mechanical properties of metal matrix nanocomposites. Two features of the nanocomposite microstructure affecting the elastic properties, including agglomerated state of silicon carbide nanoparticles and size factor, are taken into account in the micromechanical simulation. Then, finite element method is used to analyze the time histories of contact force and center deflection of silicon carbide nanoparticle-reinforced metal matrix nanocomposite plates. Several detailed parametric studies are accomplished to explore the influence of volume fraction, diameter and dispersion type of silicon carbide nanoparticles, spherical impactor velocity and diameter, plate dimensions, as well as different boundary conditions on the dynamic response of metal matrix nanocomposite plates. The presented approach accuracy is verified with the available open literature results displaying a clear agreement. The results indicate that adding the silicon carbide nanoparticles into the metal matrix materials leads to a reduction in plate center deflection and an increase in contact force between the plate and projectile. Moreover, it is found that the nanoparticle agglomeration dramatically decreases the contact force and increases the center deflection of metal matrix nanocomposite plates.
3
M. Vijaya Sekhar Babu, A. Rama Krishna, and K. N. S. Suman. "Improvement of Tensile Behaviour of Tin Babbitt by Reinforcing with Nano Ilmenite and its Optimisation by using Response Surface Methodology." International Journal of Manufacturing, Materials, and Mechanical Engineering 7, no. 1 (January 2017): 37–51. http://dx.doi.org/10.4018/ijmmme.2017010103.
Повний текст джерелаАнотація:
Metal Matrix Nanocomposites are made from conventional materials and alloys as matrix materials and had become prominent in improving the mechanical behaviour. In this paper, the authors have fabricated a Tin Babbitt particulate metal matrix nanocomposite reinforced with Ilmenite (FeTiO3). For systematic understanding or effect of processing parameters on the tensile behaviour, the central composite design of response surface methodology was used. Metal matrix nanocomposite was fabricated by using ultrasonic assisted stir casting technique. Stirring time, ultrasonic processing time, Wt.% of nanoparticles were taken as processing parameters. The objective of the work is to improve the tensile behaviour of Tin Babbitt and understand the effect of processing parameters on the tensile strength of the Tin Babbitt metal matrix nanocomposite and then optimise it for maximum tensile strength. It was found that tensile strength was improved due to the nano reinforcement.
4
Hassanzadeh-Aghdam, Mohammad K. "Micromechanics-based thermal expansion characterization of SiC nanoparticle-reinforced metal matrix nanocomposites." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 1 (January 30, 2018): 190–201. http://dx.doi.org/10.1177/0954406218756447.
Повний текст джерелаАнотація:
Understanding the structure–property relations for metal matrix nanocomposites reinforced with nanoparticles is a key factor for a reliable and optimal design of such new material systems. In the present study, coefficient of thermal expansion of silicon carbide (SiC) nanoparticle-reinforced aluminum (Al) matrix nanocomposites is predicted using a three-dimensional unit cell based micromechanical approach. The model takes into account the aluminum carbide (Al4C3) interphase region formed due to the reaction between SiC nanoparticles and surrounding Al matrix. The effects of some critical parameters, including volume fraction and diameter of SiC nanoparticles, interphase features such as geometry and material properties on the coefficient of thermal expansion of Al nanocomposite are extensively investigated. The obtained results clearly reveal the high influence of the interphase region on the coefficient of thermal expansion of Al nanocomposite. Based on the simulation results, the coefficient of thermal expansion of Al nanocomposite nonlinearly decreases with the increase in the interphase thickness or decreasing SiC nanoparticles diameter. Furthermore, the role of interphase in the thermal expansion behavior of Al nanocomposite becomes more prominent with the reduction in the nanoparticle diameter. Also, the coefficient of thermal expansion of Al nanocomposite linearly decreases as SiC nanoparticle volume fraction increases.
5
Carneiro, Íris, José Valdemar Fernandes, and Sónia Simões. "Investigation on the Strengthening Mechanisms of Nickel Matrix Nanocomposites." Nanomaterials 11, no. 6 (May 28, 2021): 1426. http://dx.doi.org/10.3390/nano11061426.
Повний текст джерелаАнотація:
The strengthening effect of carbon nanotubes (CNTs) in metal matrix nanocomposites occurs due to several mechanisms that act simultaneously. The possible strengthening mechanisms for metal matrix nanocomposites reinforced with CNTs consist of: (1) load transfer, (2) grain refinement and texture strengthening, (3) second phase strengthening, and (4) strain hardening. The main focus of this work is to identify the strengthening mechanisms that play a role in the case of the Ni-CNT nanocomposite produced by powder metallurgy. For the dispersion and mixing of the metallic powders with CNTs, two different routes were performed by ultrasonication and ball milling. The results indicated that four different strengthening mechanisms are present in the nanocomposites and had a different contribution to the final mechanical properties. The load transfer and the increase in dislocation density seem to strongly affect the properties and microstructure of the nanocomposite. The grain refinement and the presence of second phase particles have a small contribution in the strengthening of this nanocomposite, since the introduction of CNTs in the Ni matrix slightly affects the size and orientation of the grains in the matrix and a few nanometric particles of Ni3C were identified.
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Poovazhgan, Lakshmanan. "Turning Experiments on Al/B4C Metal Matrix Nanocomposites." Materials Science Forum 979 (March 2020): 16–21. http://dx.doi.org/10.4028/www.scientific.net/msf.979.16.
Повний текст джерелаАнотація:
In recent years, aluminum alloys reinforced with nanosized ceramic particulates are finding wider applications in various engineering industries like automobile, aircraft, electronics and sports. The requirement of accurate machining of nanocomposite has also gets increased. In this research work, aluminum alloy 6061 reinforced with 1.5 Wt. % of nanoB4C particulate was fabricated in cylindrical shape using ultrasonication assisted casting process. Medium duty lathe with poly crystalline diamond insert tool of 1600 grade was used to turn the Al/B4C nanocomposites. During turning of Al/B4C nanocomposites, cutting parameters like depth of cut, speed and feed were varied as per predefined level. Surface roughness of machined surface and power consumption during machining were measured using surface roughness tester and wattmeter respectively. ANOVA analysis was carried out and the optimum parameters for machining the nanocomposite were found out using MINITAB software. The nanocomposite machined with optimum parameters show good surface finish and consumed minimum power.
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Fertikova, Tatyana E., Sergey V. Fertikov, Ekaterina M. Isaeva, Vyacheslav A. Krysanov, and Tamara A. Kravchenko. "New nanocomposites for deep water deoxygenation." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 23, no. 4 (November 24, 2021): 614–25. http://dx.doi.org/10.17308/kcmf.2021.23/3682.
Повний текст джерелаАнотація:
New metal-polymer nanocomposites for deep water deoxygenation have been obtained and studied. A macro- and monoporous sulphocation exchanger with a nanometer pore size was used as the polymer matrix, and the metal was nanodispersed copper deposited in the pores of the matrix. A specific feature of the studied nanocomposites is their sodium ionic form, which eliminates the possibility of the formation of soluble copper oxidation products. The established linear dependence of the copper capacity on the number of cycles of ion-exchange saturation - chemical deposition shows that the process of metal deposition into the pores of the matrix does not have significant obstacles during 10 cycles and contributes to the production of high-capacity samples.The high efficiency and duration of the life cycle of high-capacity copper ion exchanger nanocomposites have been shown. Experimental studies of water deoxygenation in column-type apparatus with a nanocomposite nozzle were confirmed by a theoretical analysis of the process dynamics. Experimental data and theoretical calculations showed the deep level of water deoxygenation had practically unchanged values of pH and electrical conductivity. Residual oxygen can be controlled and does not exceed 3 μg/l (ppb).The hygienic and economic substantiation of the expediency of using the obtained nanocomposites is provided. The necessity of using modern nanocomposite metal-polymer materials for deep water deoxygenation circulating in technological systems was analysed. When using this innovation, the metal components of the distribution facilities will be protected from corrosion and, therefore, the hygienic requirements for the water quality of centralised drinking water supply systems will be ensured. Deep chemical water deoxygenation using copper ion-exchange polymer nanocomposites in sodium formallows solving the problem of the corrosion resistance of metals, ensuring that water meets hygienic requirements on a large scale.The competitive advantage of the considered water deoxygenation system in comparison with the known systems is the rejection of the use of precious metals-catalysts (palladium, platinum), pure hydrogen, and complex design solutions. The proposed new nanocomposite installation for water deoxygenation is characterised by its ease of use and can be built into a filter system for water purification.SWOT analysis of the advantages and disadvantages of the proposed method of water deoxygenation showed that its main advantages are the high oxygen capacity of the nanocomposite, low residual oxygen content (3 ppb (μg/l)) in the water, and ease of operation of the deoxygenator. Calculations of the economic efficiency of the nanocomposite have been carried out. The breakeven point is reached when producing only ~100 l of nanocomposite and a volume of sales ~1,600,000 roubles, above which a profit can be obtained. The payback period for an investment of ~15,000,000 roubles is rather short and will not exceed 2 years.
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Rostamzadeh, Taha, H. Shahverdi, A. Shanaghi, and T. Shahrabi. "EIS Study of Bulk Al-SiC Nanocomposite Prepared by Mechanical Alloying and the Hot Press Method." Advanced Materials Research 83-86 (December 2009): 1297–305. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.1297.
Повний текст джерелаАнотація:
Metal matrix composites (MMCs) are engineering materials in which a hard ceramic component is dispersed in a ductile metal matrix in order to obtain characteristics such as hardness and corrosion resistance. Corrosion resistance is one of the important properties of nanocomposites; however, the corrosion mechanism of the Al- SiC nanocomposite has not yet been determined. .In this study, bulk Al-5% SiC nanocomposite was prepared using mechanical alloying and the hot press method. Corrosion behavior was then investigated using EIS techniques such as Nyquist and the Bod diagram. A larger charge transfer resistance was found for the Al- SiC nanocomposite by the EIS diagrams, confirming its corrosion resistance in a 3.5wt% NaCl solution.
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Yoo, S. H., J. K. Yang, Sung Tag Oh, Kae Myung Kang, Sung Goon Kang, C. J. Lee, and Yong Ho Choa. "The Synthesis and Characteristics of Homogenously Dispersed CNT-Al2O3 Nanocomposites by the Thermal CVD Method and Pulsed Electric Current Sintering Process." Solid State Phenomena 121-123 (March 2007): 295–98. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.295.
Повний текст джерелаАнотація:
An optimum route to synthesize Al2O3-based composite powders with a homogeneous dispersion of carbon nanotubes (CNTs) was investigated. CNT/Metal/Al2O3 nanocomposite powders were fabricated by thermal chemical vapor deposition (CVD) over a metal catalyst homogeneously dispersed into an Al2O3 matrix by the means of chemical and selective reduction processes. The nanocomposite powders were densified by Pulse Electric Current Sintering (PECS). The experimental results show that the CNT/Metal/Al2O3 nanocomposites have unique electrical properties.
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Chakravadhanula, Venkata Sai Kiran, Yogendra Kumar Mishra, Venkata Girish Kotnur, Devesh Kumar Avasthi, Thomas Strunskus, Vladimir Zaporotchenko, Dietmar Fink, Lorenz Kienle, and Franz Faupel. "Microstructural and plasmonic modifications in Ag–TiO2 and Au–TiO2 nanocomposites through ion beam irradiation." Beilstein Journal of Nanotechnology 5 (September 1, 2014): 1419–31. http://dx.doi.org/10.3762/bjnano.5.154.
Повний текст джерелаАнотація:
The development of new fabrication techniques of plasmonic nanocomposites with specific properties is an ongoing issue in the plasmonic and nanophotonics community. In this paper we report detailed investigations on the modifications of the microstructural and plasmonic properties of metal–titania nanocomposite films induced by swift heavy ions. Au–TiO2 and Ag–TiO2 nanocomposite thin films with varying metal volume fractions were deposited by co-sputtering and were subsequently irradiated by 100 MeV Ag8+ ions at various ion fluences. The morphology of these nanocomposite thin films before and after ion beam irradiation has been investigated in detail by transmission electron microscopy studies, which showed interesting changes in the titania matrix. Additionally, interesting modifications in the plasmonic absorption behavior for both Au–TiO2 and Ag–TiO2 nanocomposites were observed, which have been discussed in terms of ion beam induced growth of nanoparticles and structural modifications in the titania matrix.
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Rasoolpoor, M., R. Ansari, and MK Hassanzadeh-Aghdam. "Multiscale analysis of the low-velocity impact behavior of ceramic nanoparticle-reinforced metal matrix nanocomposite beams by micromechanics and finite element approaches." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 12 (July 15, 2019): 2419–32. http://dx.doi.org/10.1177/1464420719861993.
Повний текст джерелаАнотація:
An efficient multiscale analysis is proposed to investigate the dynamic behavior of metal matrix nanocomposite beams reinforced by SiC nanoparticles under low-velocity impact loads. First, an analytical micromechanics model is developed to obtain the effective elastic properties of ceramic nanoparticle-reinforced metal matrix nanocomposite, and then the finite element method is used to predict the dynamic response of beams made of this nanocomposite material. Two important microstructural features, including size effect and agglomeration of nanoscale particles, are incorporated into the micromechanical analysis. The present simulation results for the elastic modulus and low-velocity impact response show good agreement with previously published results. The effects of volume percent, diameter and dispersion type of ceramic nanoparticles, geometrical features and boundary conditions of nanostructure, velocity and size of projectile on the contact force, and center deflection time histories of metal matrix nanocomposite beams are extensively examined. Analysis shows that homogenously distributed SiC nanoparticles into the metal matrix nanocomposites can obviously increase the nanostructure/projectile contact force and decrease both the beam center deflection and impact duration which is due to the enhancement of elastic properties. However, the ceramic nanoparticle agglomeration has an effect on the decrease of contact force and the increase of both the center deflection and impact duration. Also, it is concluded that decreasing nanoparticle size can increase the contact force and decrease the beam center deflection.
12
Barrera, Gabriele, Paola Tiberto, Paolo Allia, Barbara Bonelli, Serena Esposito, Antonello Marocco, Michele Pansini, and Yves Leterrier. "Magnetic Properties of Nanocomposites." Applied Sciences 9, no. 2 (January 9, 2019): 212. http://dx.doi.org/10.3390/app9020212.
Повний текст джерелаАнотація:
The magnetic properties of various families of nanocomposite materials containing nanoparticles of transition metals or transition-metal compounds are reviewed here. The investigated magnetic nanocomposites include materials produced either by dissolving a ferrofluid containing pre-formed nanoparticles of desired composition and size in a fluid resin submitted to subsequent curing treatment, or by generating the nanoparticles during the very synthesis of the embedding matrix. Two typical examples of these production methods are polymer nanocomposites and ceramic nanocomposites. The resulting magnetic properties turn out to be markedly different in these two classes of nanomaterials. The control of nanoparticle size, distribution, and aggregation degree is easier in polymer nanocomposites, where the interparticle interactions can either be minimized or exploited to create magnetic mesostructures characterized by anisotropic magnetic properties; the ensuing applications of polymer nanocomposites as sensors and in devices for Information and Communication Technologies (ICT) are highlighted. On the other hand, ceramic nanocomposites obtained from transition-metal loaded zeolite precursors exhibit a remarkably complex magnetic behavior originating from the simultaneous presence of zerovalent transition-metal nanoparticles and transition-metal ions dissolved in the matrix; the applications of these nanocomposites in biomedicine and for pollutant remediation are briefly discussed.
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T, Brindha, Rathinam R, Dheenadhayalan S, and Sivakumar R. "Nanocomposite Coatings in Corrosion Protection Applications: An Overview." Oriental Journal Of Chemistry 37, no. 5 (October 30, 2021): 1062–67. http://dx.doi.org/10.13005/ojc/370507.
Повний текст джерелаАнотація:
Corrosion is one of the biggest problems which affects the economy of the country, which occurs as a result of the interaction of the metal with its surroundings. One of the easiest ways to prevent corrosion is coatings of the metals with paint, plastic or wood. Several types of coatings have been adopted by corrosion scientists in the prevention of corrosion that are mainly based on electrochemical principles. Fortunately, based on cost and effectiveness, four types of coatings are variably employed by the metal and metallurgy industries. One among the cheapest and effective way to prevent corrosion is to use barrier coatings like plastic, powder and paint. Hence, nanocomposite coatings by electrochemical deposition offers an excellent, scratch and corrosion resistance on the metal surface. These coatings may be used to restoration of the components instead of interchanging them, resulting in reduced maintenance costs and disturbance. Significant improvements in the corrosion protection of steel have been reported by using metal-metal matrix, metal-metal oxide matrix, metal-polymer matrix, and ceramic-metal matrix nanocomposite. This review presents an overview of works related to nanocomposite coatings and to re-evaluate the literature for the future research in the field that still lacks validation.
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Porter, Quinton, Xiaochun Li, and Chao Ma. "Pressing and Infiltration of Metal Matrix Nanocomposites." Journal of Manufacturing and Materials Processing 5, no. 2 (May 28, 2021): 54. http://dx.doi.org/10.3390/jmmp5020054.
Повний текст джерелаАнотація:
The ability to produce metal matrix nanocomposites via pressing and infiltration was validated. Al/TiC nanocomposite was used as the model material. Pressing the powder in a die yielded cylindrical specimens with a green density of 1.98 ± 0.05 g/cm3, which was increased to only 2.11 ± 0.12 g/cm3 by sintering. Direct infiltration of the pressed specimens at 1050 °C for 3.5 h yielded specimens with a density of 3.07 ± 0.08 g/cm3, an open porosity of 3.06 ± 1.40%, and an areal void fraction of 8.09 ± 2.67%. The TiC nanoparticles were verified to be well dispersed using energy-dispersive X-ray spectroscopy. The measured hardness of 64 ± 3 HRA makes it a promising material for structural applications in industries such as aerospace and automotive.
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Shahin, Naglaa, and Reham Kamal Abd El Hamid. "Spectroscopy and Conductivity Studies of Polyvinyl Alcohol (PVA)/Polypyrrol (Ppy) Nanocomposite with Various Chloride Metals to Improved Properties of the Polymers." JOURNAL OF ADVANCES IN PHYSICS 16, no. 1 (April 8, 2019): 55–63. http://dx.doi.org/10.24297/jap.v16i1.8192.
Повний текст джерелаАнотація:
Polyvinyl alcohol- polypyrrole (PVA-PPy) nanocomposites with metal chlorides (FeCl3, NiCl2, CuCl2 and ZnCl2) have been synthesized by chemical oxidative polymerization method. These synthesized nanocomposites are characterized by using FTIR, X-ray diffraction, Transition electron microscope (TEM) and Conductivity measurement. TEM exhibit that all of the composites have uniform sizes and morphologies. The diameter of PVA/PPy nanocompsite is 58nm when the metals added to the PVA/PPy the diameters becomes smaller. The variation of electrical conductivity (log ?) with 1000/T for PVA/PPy nanocomposite with metal chlorides revealed that the increase in conductivity s at temperature (393K) with added metals can be attributed to the creation of induced charge carriers in PVA/PPy matrix
16
Lee, Han Joo, Jae Kyung Han, Byung Min Ahn, Megumi Kawasaki, and Terence G. Langdon. "Mechanical Behavior of a Metal Matrix Nanocomposite Synthesized by High-Pressure Torsion via Diffusion Bonding." Materials Science Forum 879 (November 2016): 1068–73. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1068.
Повний текст джерелаАнотація:
High-pressure torsion (HPT) is one of the major severe plastic deformation (SPD) procedures where disk metals generally achieve exceptional grain refinement at ambient temperatures. HPT has been applied for the consolidation of metallic powders and bonding of machining chips whereas very limited reports examined the application of HPT for the fabrication of nanocomposites. An investigation was initiated to evaluate the potential for the formation of a metal matrix nanocomposite (MMNC) by processing two commercial metal disks of Al-1050 and ZK60 magnesium alloy through HPT at room temperature. Evolutions in microstructure and mechanical properties including hardness and plasticity were examined in the processed disks with increasing numbers of HPT turns up to 5. This study demonstrates the promising possibility for using HPT to fabricate a wide range of hybrid MMNCs from simple metals.
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Alalkawi, H. J. M., Ghada Adel Aziz, and Hussain A. Aljawad. "WEAR PERFORMANCE AND MAGNETIC PROPERTY OF ALUMINUM REINFORCED WITH FE2O3 AND AL2O3 HYBRID NANOCOMPOSITE USING POWDER METALLURGY P/M METHOD." IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING 20, no. 4 (December 28, 2020): 322–31. http://dx.doi.org/10.32852/iqjfmme.v20i4.531.
Повний текст джерелаАнотація:
The current study deals with fabricating a hybrid nanocomposite. Pure aluminum as the base matrix and Fe2O3 and Al2O3. A reinforcements Fe2O3 weight percentage (wt%) is varied (1.5, 2.5 and 5 % wt%) and Al2O3 is held constant (2 wt%). The new designed nanocomposite was produced using Powder Metallurgy (P/M) method. The experimental results revealed that the microstructure images of nanocomposites showed uniformly distributed of Fe2O3 and Al2O3 in aluminum matrix. Dry tribological behavior (wear rate and coefficient of friction) was studied and for varying hybrid reinforcement content. The results observed that the wear resistance of hybrid nanocomposites improved with the increasing of Fe2O3 + Al2O3 reinforced material but the better wear resistance was recorded with the (1.5% Fe2O3 + 2% Al2O3) wt% than the base metal and other nanocomposites. It is evident that the maximum reduction of wear rate and COF were 4.87 × 10-8 g/m and 0.59 respectively for the (1.5% Fe2O3 + 2% Al2O3) nanocomposite. The hysteresis curve of nanocomposites showed that the magnetic properties which indicated that the better response of magnetic properties was found with the nanocomposite of (1.5% Fe2O3 + 2% Al2O3) content.
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Moheimani, Seyed Kiomars, Mehran Dadkhah, Mohammad Hossein Mosallanejad, and Abdollah Saboori. "Fabrication and Characterization of the Modified EV31-Based Metal Matrix Nanocomposites." Metals 11, no. 1 (January 10, 2021): 125. http://dx.doi.org/10.3390/met11010125.
Повний текст джерелаАнотація:
Metal matrix nanocomposites (MMNCs) with high specific strength have been of interest for numerous researchers. In the current study, Mg matrix nanocomposites reinforced with AlN nanoparticles were produced using the mechanical stirring-assisted casting method. Microstructure, hardness, physical, thermal and electrical properties of the produced composites were characterized in this work. According to the microstructural evaluations, the ceramic nanoparticles were uniformly dispersed within the matrix by applying a mechanical stirring. At higher AlN contents, however, some agglomerates were observed as a consequence of a particle-pushing mechanism during the solidification. Microhardness results showed a slight improvement in the mechanical strength of the nanocomposites following the addition of AlN nanoparticles. Interestingly, nanocomposite samples were featured with higher electrical and thermal conductivities, which can be attributed to the structural effect of nanoparticles within the matrix. Moreover, thermal expansion analysis of the nanocomposites indicated that the presence of nanoparticles lowered the Coefficient of Thermal Expansion (CTE) in the case of nanocomposites. All in all, this combination of properties, including high mechanical strength, thermal and electrical conductivity, together with low CTE, make these new nanocomposites very promising materials for electro packaging applications.
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Moheimani, Seyed Kiomars, Mehran Dadkhah, Mohammad Hossein Mosallanejad, and Abdollah Saboori. "Fabrication and Characterization of the Modified EV31-Based Metal Matrix Nanocomposites." Metals 11, no. 1 (January 10, 2021): 125. http://dx.doi.org/10.3390/met11010125.
Повний текст джерелаАнотація:
Metal matrix nanocomposites (MMNCs) with high specific strength have been of interest for numerous researchers. In the current study, Mg matrix nanocomposites reinforced with AlN nanoparticles were produced using the mechanical stirring-assisted casting method. Microstructure, hardness, physical, thermal and electrical properties of the produced composites were characterized in this work. According to the microstructural evaluations, the ceramic nanoparticles were uniformly dispersed within the matrix by applying a mechanical stirring. At higher AlN contents, however, some agglomerates were observed as a consequence of a particle-pushing mechanism during the solidification. Microhardness results showed a slight improvement in the mechanical strength of the nanocomposites following the addition of AlN nanoparticles. Interestingly, nanocomposite samples were featured with higher electrical and thermal conductivities, which can be attributed to the structural effect of nanoparticles within the matrix. Moreover, thermal expansion analysis of the nanocomposites indicated that the presence of nanoparticles lowered the Coefficient of Thermal Expansion (CTE) in the case of nanocomposites. All in all, this combination of properties, including high mechanical strength, thermal and electrical conductivity, together with low CTE, make these new nanocomposites very promising materials for electro packaging applications.
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Sosedova, L. M., V. S. Rukavishnikov, and E. A. Titov. "Biological response of the organism to the introduction of metal nanocomposites." Russian Journal of Occupational Health and Industrial Ecology, no. 9 (March 19, 2020): 761–62. http://dx.doi.org/10.31089/1026-9428-2019-59-9-761-762.
Повний текст джерелаАнотація:
The results of a study on rats toxicity of nanoparticles of metals bismuth, gadolinium and silver encapsulated in a natural biopolymer matrix arabinogalactan are presented. When intake of nanocomposite of silver revealed the readiness of the brain cell to apoptosis. The effect of bismuth and gadolinium nanocomposites did not cause an increase in the process of programmed cell death.
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Toma, H. E., R. A. Timm, M. F. Gonzalez, and K. Araki. "Vanadium(V) Oxide – Metal Organic Nanocomposites as Electrochemical Sensing Materials." Materials Science Forum 636-637 (January 2010): 729–36. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.729.
Повний текст джерелаАнотація:
This work deals with a new class of vanadium pentoxide nanocomposites containing supramolecular iron or manganese tetrapyridyl porphyrins coordinated to four [Ru(bipy)2Cl]+ complexes. Their characterization was carried out by means of X-ray diffraction, SEM, AFM, confocal Raman microscopy, electronic spectroscopy and electrochemistry. According to X-ray diffraction, the original VXG lamellar framework was maintained in the nanocomposite material, but the interlamellar distance increased from 11.6 Å to 18.5 Å, reflecting the intercalation of the porphyrin species into the inorganic matrix. The films generated by direct deposition of the nanocomposite aqueous suspensions onto interdigitated gold electrodes exhibited good electrical and electrochemical performance for application in amperometric sensors.
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Ghanaraja, S., R. Madhu, K. S. Ravikumar, and P. Likith. "Synthesis and Mechanical Property Evaluation of Hot Forged Aluminium Alloy Reinforced with Nano Alumina." Applied Mechanics and Materials 895 (November 2019): 90–95. http://dx.doi.org/10.4028/www.scientific.net/amm.895.90.
Повний текст джерелаАнотація:
Metal matrix composites with aluminium matrix and non-metallic reinforcements are popular candidates in automotive, aerospace, sports and military application because of their high strength-to-weight ratio, stiffness, wear resistance, high-temperature resistance, etc. often they are subjected to secondary manufacturing processes like extrusion, rolling, forging, etc. to suit the service requirements. Metal matrix composites reinforced by nanoparticles are very promising materials, suitable for a large number of applications. In the present investigation, nanocomposites have been synthesized by addition of 0.25, 0.5, 0.75, 1 and 1.25 wt% of nanoAl2O3 powder in to molten Al 1100-Mg alloy using stir casting method and then hot forged. The mechanical properties such as tensile strength, hardness and percentage elongations were studied for all the test specimens. The 0.75 wt% of nanoAl2O3 added forged nanocomposite exhibited higher hardness and 0.5 wt% of nanoAl2O3 added forged nanocomposite exhibited higher yield strength, tensile strength and percentage of elongation.
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Sasikanth, S. M., and Ganapathi Raman R. "A Brief Review on Synthesis of Metal Oxide Based Nanocompositesandtheir Photocatalytic Applications." Restaurant Business 118, no. 7 (July 5, 2019): 59–66. http://dx.doi.org/10.26643/rb.v118i7.7247.
Повний текст джерелаАнотація:
Nanocomposite, a multiphase solid material which is having the phases of one, two, or three dimensions less than 100 nanometers. These materials have the physical and chemical properties which depend on the morphology and the interfacial characteristics of the component materials. Metal oxide nanocomposites have proven themselves their importance in the present time with a wide variety of applications in every industrial sector. Wet chemical methods are one of the simplest routes for the synthesis of the metal oxide nanocomposites, and they are cost effective as well. For the synthesis of the complex matrix-based metal oxide nanocomposites, Co-precipitation is the method used. The simple synthesis methods make them unique material for different applications. This review paper discusses the synthesisof metal oxide nanocomposites and their applications.
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Gupta, Pallav, Naseem Ahamad, Jimmy Mehta, Devendra Kumar, Mumtaz A. Quraishi, Moti L. Rinawa, Sumit Gupta, Vijay Chaudhary, and Kishor K. Sadasivuni. "Corrosion, optimization and surface analysis of Fe-Al2O3-CeO2 metal matrix nanocomposites." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 236, no. 8 (December 7, 2021): 4346–56. http://dx.doi.org/10.1177/09544062211047844.
Повний текст джерелаАнотація:
In the present work, metal matrix nanocomposites are being prepared using Fe as base material reinforced with Al2O3 and doped with CeO2. Nanocomposite specimens were synthesized using powder metallurgy technique. Tafel Polarization, Corrosion Behavior and its optimization using Analysis of Variance (ANOVA) as well as Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) along with Phase and Microstructure of prepared samples have been investigated. It was observed that corrosion rate and corrosion current density was highest for pure Fe samples whereas 1.0% CeO2 doped Fe-Al2O3 metal matrix nanocomposite system showed the formation of nano amorphous layer on the specimen surface. Analysis of Variance shows that the different compositions of samples have changed outcome on corrosion behavior. Technique for Order of Preference by Similarity to Ideal Solution analysis shows ordered preference of sample as per the readings of corrosion rate.
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Poovazhagan, L., S. C. Amith, S. Magesh, and D. Naveen. "Ultrasonication Assisted Casting of Bulk Aluminum Metal Nanocomposites." Applied Mechanics and Materials 852 (September 2016): 104–9. http://dx.doi.org/10.4028/www.scientific.net/amm.852.104.
Повний текст джерелаАнотація:
Nanoparticulates reinforced aluminum metal nanocomposites are prospective materials for aerospace, automobile, sports, and marine industries because of their superior strength to weight ratio and high temperature bearing properties. In this work, novel ultrasonication assisted casting method was used to fabricate different weight percentages (0, 0.5, 1.0 and 1.5) of SiC nanoparticulates reinforced aluminum alloy 6061 nanocomposites. The following results were observed from hardness test, impact test and grain size measurements. Increase in weight percentage of nano-SiC in aluminum matrix leads to significant improvement in microhardness, which was confirmed by Vickers-microhardness tests. Compared to the monolithic aluminum, the maximum improvement in microhardness of around 47 % was observed in 1.5 weight percentage SiC reinforced composites. Optical microscopic images showed refined aluminum grains in nanocomposites compared to pure alloy. Impact resistance of aluminum matrix was almost retained with an addition of SiC nanoparticles. Impact fracture surfaces of both pure alloy and nanocomposite exhibit the combination of ductile and brittle fracture.
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Sleptsov, V. V., L. V. Kozitov, A. O. Diteleva, D. Yu Kukushkin, and A. A. Nagaev. "A new generation of nanocomposite materials based on carbon and titanium for use in supercapacitor energy storage devices." Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering 22, no. 3 (January 19, 2020): 212–18. http://dx.doi.org/10.17073/1609-3577-2019-3-212-218.
Повний текст джерелаАнотація:
In this paper, promising nanocomposite materials based on carbon and titanium are considered. It is shown that the use of a highly porous matrix is of particular interest. Materials based on such matrices have minimal weight and high strength characteristics. The paper also describes composites based on porous carbon fibers with metal oxides. The directions for producing composites can be divided into three types: matrix method, coating of finished nanoparticles with an inert shell, and the formation of nanoparticles and matrices in one process. The coating of nanoparticles with an inert shell prevents their oxidation and preserves the necessary magnetic properties. When using methods such as IR pyrolysis, arc evaporation forms third-party metal-carbon phases that pollute the resulting material. To avoid this, reducing agents are used, for example, hydrogen when coking nanoparticles in a methane plasma current restores metal particles from its Sol-gel and prevents them from reacting with carbon. But with this method, it is difficult to control the particle size. Using a ready-made matrix allows you to control the size of nanoparticles. However, this method uses high temperatures, and sometimes hydrogen, which complicates the production process. The main problem in the field of nanocomposites is the search for more technological, simple, cheap and environmentally friendly methods for obtaining nanocomposites with high performance characteristics. The developed technology for forming the pore space of the initial carbon matrix does not have the above disadvantages. This technology has a simple, cheap, environmentally friendly design. high temperatures are not used in the process of producing nanocomposites and third-party metal-carbon phases are not formed. The resulting nanocomposite materials were used as electrodes for ultra-high-volume capacitor structures. When studying the capacitance and electrical characteristics of samples, it was found that the formation of metal on a porous carbon matrix can significantly reduce the internal resistance of the cell and increase the specific energy consumption.
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Kausar, Ayesha. "Corrosion prevention prospects of polymeric nanocomposites: A review." Journal of Plastic Film & Sheeting 35, no. 2 (October 11, 2018): 181–202. http://dx.doi.org/10.1177/8756087918806027.
Повний текст джерелаАнотація:
Corrosion is a serious problem for implementing metallic components and devices in industrial zones. Considerable effort has been made to develop corrosion prevention strategies. Initially, paints, pigments, and organic coatings have been applied to prevent metal corrosion. Consequently, conjugated polymers, epoxy resin, phenolics, acrylic polymers, and many thermoplastics as well as thermoset resins have been used to inhibit corrosion. Lately, nanofillers such as fullerene, nanodiamond, graphene, graphene oxide, carbon nanotube, carbon black, nanoclay, and inorganic nanoparticle have been introduced in polymeric matrices to harness valuable corrosion protection properties of the nanocomposite. Corrosion protection performance of a nanocomposite depends on nanofiller dispersion, physical and covalent interaction between matrix/nanofiller and nanofiller adhesion to the substrate. Moreover, a high performance anti-corrosion nanocomposite must have good barrier properties, and high scratch, impact, abrasion, and chemical resistance. Thus, polymeric nanocomposites have been found to prevent corrosion in aerospace and aircraft structural parts, electronic components, bipolar plates in fuel cells, and biomedical devices and systems. However, numerous challenges need to be addressed in this field to attain superior corrosion resistant nanocomposites. Future research on polymer nanocomposites has the potential to resolve the current challenges of metal corrosion through entire replacement of metal-based materials with advanced nanomaterials.
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Carneiro, Íris, Filomena Viana, Manuel F. Vieira, José Valdemar Fernandes, and Sónia Simões. "Characterization of Ni–CNTs Nanocomposites Produced by Ball-Milling." Metals 10, no. 1 (December 18, 2019): 2. http://dx.doi.org/10.3390/met10010002.
Повний текст джерелаАнотація:
This research focuses on the characterization of a metal matrix nanocomposite (MMNC) comprised of a nickel matrix reinforced by carbon nanotubes (CNTs). The aim of this study was to characterize Ni–CNTs nanocomposites produced by powder metallurgy using ball-milling. CNTs were initially untangled using ultrasonication followed by mixture/dispersion with Ni powder by ball-milling for 60, 180, or 300 min. The mixtures were cold-pressed and then pressureless sintered at 950 °C for 120 min under vacuum. Their microstructural characterization was mainly performed by optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). The mechanical properties were evaluated by Vickers microhardness. The results indicate that combining ultrasonication and ball-milling can successfully produce Ni–CNTs nanocomposites. The ball-milling time has a significant effect on both the CNT dispersion and the final nanocomposite microstructure.
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He, Chun Lin, Ying Ying Bai, De Yuan Lou, Guo Feng Ma, Jan Ming Wang, Zhao Fu Du, and Dong Liang Zhao. "Corrosion Resistance of SiCp/Al Metal Matrix Nanocomposites." Advanced Materials Research 773 (September 2013): 468–71. http://dx.doi.org/10.4028/www.scientific.net/amr.773.468.
Повний текст джерелаАнотація:
The effect of volume fraction of SiC nanoparticles on the corrosion resistance of the SiCp/Al metal matrix composites (MMCs) in 3.5 wt.% NaCl aqueous solution were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The results show that pitting susceptibility is about the same for the nanocomposites and the correspondingly unreinforced matrix metal Al, and the corrosion potentials of the MMCs are about 50 mV-60 mV more positive than that of the unreinforced Al, and is independent of the volume fraction of SiC nanoparticles. The corrosion resistance for the nanocomposite slightly decreases when the volume fraction increases due to both SiC nanoparticle agglomeration and promoting galvanic corrosion between SiC and Al.
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Borgonovo, Cecilia, and Diran Apelian. "Manufacture of Aluminum Nanocomposites: A Critical Review." Materials Science Forum 678 (February 2011): 1–22. http://dx.doi.org/10.4028/www.scientific.net/msf.678.1.
Повний текст джерелаАнотація:
In the last two decades, metal matrix nanocomposites have witnessed tremendous growth. Particulate-reinforced nanocomposites have been extensively employed in the automotive industry for their capability to withstand high temperature and pressure conditions. Several manufacturing approaches have been used to fabricate them. Non-homogeneous particle dispersion and poor interface bonding are the main drawbacks of conventional manufacturing techniques. A critical review of nanocomposite manufacturing processes is presented; the distinction between ex-situ and in-situ processes is discussed in some detail. Moreover, in-situ gas/liquid processes are elaborated and their advantages are discussed. The thermodynamics and kinetics of the reaction between the precursor gas and the liquid metal have been analyzed and their role on particle formation studied. This critical review will provide the reader with an overview of nanocomposite manufacturing methods along with a clear understanding of advantages and disadvantages.
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Han, Guo Qiang, Wen Bo Du, Zhao Hui Wang, Ke Liu, Shu Bo Li, and Xian Du. "Effective Dispersion of CNTs to Fabricate CNT/Mg Nanocomposite." Materials Science Forum 816 (April 2015): 470–75. http://dx.doi.org/10.4028/www.scientific.net/msf.816.470.
Повний текст джерелаАнотація:
An effective dispersion process to cast CNT-reinforced in a concentrated magnesium alloy (AZ31) nanocomposite was investigated in this study. The metal magnesium powder was first coated with dispersed CNTs by wet process, followed by the fabricating of CNT/Mg precursor using mechanical briquetting and extrusion. The resultant precursor was then added into AZ31 alloy during the melting process. Finally, CNT/Mg nanocomposites with grain refinement matrix composite were fabricated in as-cast and as-extruded. Compared with the commercial AZ31 alloy, CNT/Mg nanocomposites exhibited higher yield strength of 270 MPa with an increase of 22.7%, which can be largely ascribed to the effective dispersion process of CNTs in the alloy matrix, and the elongation is no significant decrease.
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Ivkov, Sergey A., Konstantin A. Barkov, Evelina P. Domashevskaya, Elena A. Ganshina, Dmitry L. Goloshchapov, Stanislav V. Ryabtsev, Alexander V. Sitnikov, and Pavel V. Seredin. "Nonlinear Transport and Magnetic/Magneto-Optical Properties of Cox(MgF2)100-x Nanostructures." Applied Sciences 13, no. 5 (February 26, 2023): 2992. http://dx.doi.org/10.3390/app13052992.
Повний текст джерелаАнотація:
The aim of this work was to comprehensively study the effect of the variable atomic composition and structural-phase state of Cox(MgF2)100-x nanocomposites on their nonlinear transport and magnetic/magneto-optical properties. Micrometer-thick nanocomposite layers on glass substrates were obtained by means of ion-beam sputtering of a composite target in the argon atmosphere in a wide range of compositions (x = 16–59 at.%). Using a low metal content in the nanocomposite, magnesium fluoride was kept in the nanocrystalline state. As the metal content increased, nanocrystalline cobalt was formed. The value of the resistive percolation threshold, xper = 37 at.%, determined from the concentration dependences of the electrical resistance of the nanocomposites coincided with the beginning of nucleation of the metallic nanocrystals in the MgF2 dielectric matrix. The absolute value of the maximum negative magnetoresistive effect in the nanocomposites was 5% in a magnetic field of 5.5 kG at a Co concentration of x = 27 at.%.
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Kamashev, Dmitriy, and Aleksey Kryazhev. "Synthesis of nanocomposite materials by reduction of Group I metals of the periodic table Au, Ag in the voids of the opal matrix." Vestnik of geosciences, no. 1 (March 17, 2022): 33–43. http://dx.doi.org/10.19110/geov.2022.1.3.
Повний текст джерелаАнотація:
We carried out experiments on the synthesis of nanocomposite materials based on supramolecular silica structures, consisting of monodisperse spherical particles 300 nm in diameter and Group I metals of the periodic system Au and Ag. We determined basic conditions (preliminary preparation, type of reducing agent used, metal concentration and holding time) that allowed producing nanocomposite materials with various degrees and forms of entering of metal particles, both on surface of silica spheres and in packing voids between them. The obtained nanocomposite materials can find wide application in various fields of optics, electronics and catalysis.
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Meena, Jagram, Harish Chandra, and Sudhir G. Warkar. "Carboxymethyl Tamarind Kernel Gum /ZnO- Biocomposite: As an Antifungal and Hazardous Metal Removal Agent." Journal of New Materials for Electrochemical Systems 25, no. 3 (August 31, 2022): 206–13. http://dx.doi.org/10.14447/jnmes.v25i3.a08.
Повний текст джерелаАнотація:
ZnO nanoparticles (ZnO NPs) were in situ mixed with carboxymethyl tamarind kernel gum to generate the new biocomposite. High-resolution transmission electron microscopy (HR-TEM), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR), x-ray diffraction analysis (XRD), and dynamic light scattering (DLS)were used to characterize the CMTKG/ZnO nanocomposites. Numerous characterizations were utilized to prove that ZnO NPs had been integrated into the biopolymer matrix. The standard size of the CMTKG/ZnO nanocomposites was developed to be greater than 32–40 nm using high-resolution transmission electron microscopy and x-ray analysis de-Scherer methods. Chromium (VI) was removed from the aqueous solution using the nanocomposite (CMTKG/ZnO) as an adsorbent. The nanocomposite reached its maximum adsorption during 80 minutes of contact time, 30 mg/L chromium (VI) concentration, 2.0 g/L adsorbent part, and 7.0 pH. Further research into the antifungal activity of CMTKG/ZnO nanocomposites against Aspergillus flavus MTCC-2799 was conducted.
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Bobić, Biljana, Aleksandar Vencl, Jovana Ružić, Ilija Bobić, and Zvonko Damnjanović. "Microstructural and basic mechanical characteristics of ZA27 alloy-based nanocomposites synthesized by mechanical milling and compocasting." Journal of Composite Materials 53, no. 15 (December 11, 2018): 2033–46. http://dx.doi.org/10.1177/0021998318817876.
Повний текст джерелаАнотація:
Particulate nanocomposites with the base of ZA27 alloy were synthesized using an innovative route, which includes mechanical milling and compocasting. Scrap from the matrix alloy and ceramic nanoreinforcements were mechanically milled using the ball-milling technique, which led to the formation of composite microparticles. The use of these particles in the compocasting process provided better wettability of ceramic nanoreinforcements in the semi-solid metal matrix, which resulted in a relatively good dispersion of the nanoreinforcements in nanocomposite castings. The presence of nanoreinforcements led to the grain refinement in the matrix of nanocomposites. The mechanical properties of the synthesized nanocomposites are improved and compared with the properties of the metal matrix. The observed increase in the hardness of nanocomposites with Al2O3 nanoreinforcements (20–30 nm) was 6.5% to 10.8%, while the yield strength of these nanocomposites has increased by 12.2% to 23.2%. The hardness and compressive yield strength of the nanocomposites with Al2O3 nanoparticles (100 nm) increased by 1.7% to 8.0% and 2.3% to 8.3%, respectively. The increase in hardness of the nanocomposites with SiC nanoparticles (50 nm) was 11.5% to 20.6%, while the increase in the yield strength was 15.6% to 24.5%. The greatest contribution to the overall strengthening in the synthesized nanocomposites is the result of increased dislocation density due to the difference in coefficients of thermal expansion for the matrix alloy and nanoreinforcements.
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Thakur, Manita, and Deepak Pathania. "Fabrication of Gelatin-Zr (IV) Phosphate and Alginate-Zr (IV) Phosphate Nanocomposite Based Ion Selective Membrane Electrode." Nano Hybrids and Composites 20 (April 2018): 108–20. http://dx.doi.org/10.4028/www.scientific.net/nhc.20.108.
Повний текст джерелаАнотація:
Gelatin- Zr (IV) phosphate nanocomposite (GT@ZPNC) and alginate- Zr (IV) phosphate nanocomposite (AG@ZPNC) ion exchangers has been prepared by sol-gel method. The nanocomposites are characterised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The SEM results of GT@ZPNC and AG@ZPNC confirmed that after the binding of polymer matrix to inorganic part, morphology was completely reformed. TEM results confirmed the synthesised materials were nanocomposite in nature. The GT@ZPNC and AG@ZPNC ion exchangers have been explored to fabricate ion selective electrode for the detection of Cd (II) and Al (III) metal ions. Both ion selective membrane electrodes show wide working concentration and pH range with good response time.
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Peng, X., J. Zhao, Hong Yan Zhang, and Fu Hui Wang. "Novel Electrodeposited Ni-Based Nanocomposite Precursors for Nitriding and Low Temperature Chromizing." Materials Science Forum 522-523 (August 2006): 331–38. http://dx.doi.org/10.4028/www.scientific.net/msf.522-523.331.
Повний текст джерелаАнотація:
Two types of Ni-base nanocomposites were prepared by co-deposition of Ni with nano-sized particles of Cr or CeO2, respectively. Both Ni-Cr and Ni-CeO2 nanocomposites were mainly composed of nanocrystalline Ni matrix, in which certain content of nanoparticles of Cr or CeO2 randomly dispersed. The Ni-Cr nanocomposite was used as a precursor for preparing a novel hard Ni/CrN coating by plasma nitriding at 560oC. The Ni-CeO2 nanocomposite was used as a precursor to develop a novel oxidation-resistant chromia-forming coating by low temperature chromizing using a conventional pack-cementation method. The microhardness of the nitrided layer on the Ni-Cr nanocomposite and the oxidation resistance of the chromizing coating on the Ni-CeO2 nanocomposite were both greatly increased, in comparison to the corresponding counterparts, which were obtained by plasma nitriding on a conventional coarse-grained Ni-Cr alloy with similar Cr content and by chromizing on a coarse-grained Ni metal, respectively. The relationships among the microstructures of the nanocomposite precursors and the nitrided/or chromized coatings, and their properties were investigated and discussed.
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SADABADI, Hamed, Omid GHADERI, Amir KORDIJAZI, and Pradeep K. ROHATGI. "Graphene derivatives reinforced metal matrix nanocomposite coatings: A review." Journal of Metals, Materials and Minerals 32, no. 3 (September 30, 2022): 1–14. http://dx.doi.org/10.55713/jmmm.v32i3.1518.
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Due to the extraordinary mechanical, thermal, and electrical properties of graphene, graphene oxide (GO), and reduced graphene oxide (rGO), these materials have the potential to become ideal nanofillers in the electrodeposited nanocomposite coatings. This article provides an overview of literature on the improvements of properties associated with graphene, GO, and rGO-reinforced coatings, along with the processing parameters and mechanisms that would lead to these improvements in electrodeposited metal matrix nanocomposite coatings, where those affected the microstructural, mechanical, tribological, and anti-corrosion characteristics of coatings. The challenges associated with the electroplating of nanocomposite coatings are addressed. The results of this survey indicated that adding graphene into the plating bath led to a finer crystalline size in the composite coating due to increasing the potential development of specific crystalline planes and the number of heterogeneous nucleation sites. This consequently caused an improvement in hardness and in tribological properties of the electrodeposited coating. In graphene reinforced metallic composites, the severe adhesive wear mechanism for pure metallic coatings was replaced by abrasive wear and slight adhesive wear, where the formation of a tribolayer at the contact surface increased the wear resistance and decreased friction coefficient. Furthermore, superhydrophobicity and smaller grain size resulted from embedding graphene in the coating. It also provided a smaller cathode/anode surface ratio against localized corrosion, which has been found to be the main anti-corrosion mechanism for graphene/metal coating. Lastly, the study offers a discussion of the areas of research that need further attention to make these high-performance nanocomposite coatings more suitable for industrial applications.
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Takeno, T., Toshiyuki Takagi, Aleksandra A. Bozhko, M. Shupegin, and T. Sato. "Metal-Containing Diamond-Like Nanocomposite Thin Film for Advanced Temperature Sensors." Materials Science Forum 475-479 (January 2005): 2079–82. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2079.
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The conductivity of metal-carbon-silicon nanocomposite films considered as potential candidates for the application as wide-range temperature sensors for severe environmental conditions is studied. The films combine unique properties of amorphous carbons with a new functionality imparted by the presence of metal nanoclusters in host matrix. The deposition of carbon-silicon phase was performed using PECVD of siloxane vapors. Metals (W, Nb, and Cr) with concentration in the range from 12 to 40 at. % were incorporated in the carbon-silicon host matrix by DC magnetron co-sputtering. The conductivity of the films decreases with temperature in the range 80-400 K, being well described by the power-law dependence. The conductivity mechanism found satisfactory explanation in the framework of the model of inelastic tunneling of electrons between metal nanoclusters dispersed in carbon-silicon matrix. The parallel study of the influence of metal concentration increase on carbon phase microstructure was carried out using Raman spectroscopy.
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Carneiro, Íris, and Sónia Simões. "Effect of Morphology and Structure of MWCNTs on Metal Matrix Nanocomposites." Materials 13, no. 23 (December 6, 2020): 5557. http://dx.doi.org/10.3390/ma13235557.
Повний текст джерелаАнотація:
The effect of using different carbon nanotubes (CNTs) on the production of nanocomposites was evaluated in this work. The investigated CNTs were multi-walled carbon nanotubes (MWCNTs) with different morphologies and structures. The main objective was to relate the results reported by numerical simulation with the results obtained experimentally in order to validate these methodologies. A detailed characterization of CNTs was carried out to establish the different main characteristics, such as inner and outer diameters, defects, structure and the number of walls. Metal matrix nanocomposites were produced using the powder metallurgy route. The experimental results show that the morphology and structure of MWCNTs have a significant effect on the dispersion process for nanocomposite production. Straight CNTs with a larger diameter and with few defects allow for the production of nanocomposites with uniform dispersion and strong interface bonding, leading to a higher hardness value. In addition, the CNT introduction into a metal matrix induces a change in the deformation behavior that plays an important role in the strengthening mechanisms. Although some aspects are not considered in the molecular dynamic (MD) simulation, such as the CNT random orientation and CNT agglomeration, some comparative relationships can be performed in order to validate some methodologies. While the structure and morphology of the CNTs have a significant influence on the dispersion process, the influence of the diameter and the functionalization treatment on the properties of the nanocomposites is also identified. The experimental results show that the decrease in the diameter of the CNTs and the use of functionalized CNTs also contribute to the obtention of lower mechanical properties of the nanocomposites, as is pointed out in the results of MD carried out in nanocomposites.
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Ванин, А. И., А. Е. Лукин, С. Г. Романов, В. Г. Соловьeв, С. Д. Ханин та М. В. Яников. "Оптические свойства металлодиэлектрических структур на основе фотонно-кристаллических опаловых матриц-=SUP=-*-=/SUP=-". Физика твердого тела 60, № 4 (2018): 770. http://dx.doi.org/10.21883/ftt.2018.04.45691.06d.
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AbstractOptical properties of novel metal–dielectric nanocomposite materials based on opal matrices have been investigated. The position of optical resonances of nanocomposites, obtained by embedding of silver into the opal matrix by the electrothermodiffusion method, is explained by the Bragg diffraction, and an asymmetric form of resonance curves is attributed to the Fano resonance. An anomalous transmission and absorption of light by hybrid plasmon-photonic layered heterostructures, which is apparently associated with excitation of surface plasmon-polaritons, propagating along “metal–dielectric” interfaces, was revealed.
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Dal Pont, Kevin, Anatoli Serghei, and Eliane Espuche. "Multifunctional Pd-Based Nanocomposites with Designed Structure from In Situ Growth of Pd Nanoparticles and Polyether Block Amide Copolymer." Polymers 13, no. 9 (May 3, 2021): 1477. http://dx.doi.org/10.3390/polym13091477.
Повний текст джерелаАнотація:
Nanocomposites containing palladium nanoparticles were synthesized by in situ generation route from palladium acetate and a polyether block amide matrix with the aim to obtain materials with specific nanoparticle location and function properties. The chosen Pebax matrix was composed of a continuous soft phase containing dispersed semi-crystalline rigid domains. Nanocomposite films with Pd amount up to 30 wt% (corresponding to 3.5 vol%) were directly prepared from the palladium precursor and the copolymer matrix through a solvent cast process. The microstructure of the films was investigated by microcalorimetry, X-ray diffraction analyses and transmission electron microscopy. The nanocomposites’ function properties in terms of electrical conductivity and interaction towards hydrogen were studied as a function of the palladium content. It was shown that the spherical crystalline Pd nanoparticles that were in situ formed were located in the continuous soft phase of the copolymer matrix. They did not induce modification of Pebax microstructure and chain mobility. The specific location of the metal nanoparticles within the copolymer matrix associated with their low size allowed obtaining conductive materials for Pd amount equal to 3.5 vol%. Moreover, the affinity towards hydrogen evidenced from hydrogen permeation experiments made this nanocomposite series promising for further development in sensing applications.
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Bekhoukh, Amina, Imane Moulefera, Lilia Sabantina, and Abdelghani Benyoucef. "Development, Investigation, and Comparative Study of the Effects of Various Metal Oxides on Optical Electrochemical Properties Using a Doped PANI Matrix." Polymers 13, no. 19 (September 29, 2021): 3344. http://dx.doi.org/10.3390/polym13193344.
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A comparative study was performed in order to analyze the effect of metal oxide (MO) on the properties of a polymeric matrix. In this study, polyaniline (PANI)@Al2O3, PANI@TiC, and PANI@TiO2 nanocomposites were synthesized using in situ polymerization with ammonium persulfate as an oxidant. The prepared materials were characterized by various analytical methods such as X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), UV/visible (UV/Vis) spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). Furthermore, the conductive properties of the materials were tested using the four-point probe method. The presence of MO in the final product was confirmed by XPS, XRD, FTIR, and TEM, while spectroscopic characterization revealed interactions between the MOs and PANI. The results showed that the thermal stability was improved when the MO was incorporated into the polymeric matrix. Moreover, the results revealed that incorporating TiO2 into the PANI matrix improves the optical bandgap of the nanocomposite and decreases electrical conductivity compared to other conducting materials. Furthermore, the electrochemical properties of the hybrid nanocomposites were tested by cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). The obtained results suggest that the PANI@TiO2 nanocomposite could be a promising electrode material candidate for high-performance supercapacitor applications.
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Padhi, Payodhar, and Sachikanta Kar. "A Novel Route for Development of Bulk Al/SiC Metal Matrix Nanocomposites." Journal of Nanotechnology 2011 (2011): 1–5. http://dx.doi.org/10.1155/2011/413512.
Повний текст джерелаАнотація:
Addition of nano particles, even in quantities as small as 2 weight percent can enhance the hardness or yield strength by a factor as high as 2. There are several methods for the production of metal matrix nanocomposites including mechanical alloying, vertex process, and spray deposition and so forth. However, the above processes are expensive. Solidification processing is a relatively cheaper route. During solidification processing, nano particulates tend to agglomerate as a result of van der Waals forces and thus proper dispersion of the nano particulate in metal matrix is a challenge. In the present study a noncontact method, where the ultrasonic probe is not in direct contact with the liquid metal, was attempted to disperse nanosized SiC particulates in aluminum matrix. In this method, the mold was subjected to ultrasonic vibration. Hardness measurements and microstructural studies using HRTEM were carried out on samples taken from different locations of the nanocomposite ingot cast by this method.
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Marin, Laurentiu, Topala Pavel, Catalina Daniela Marin, and Teodor Sandu. "Physical Training Methods For Mine Rescuers In 2015." ACTA Universitatis Cibiniensis 66, no. 1 (July 1, 2015): 108–13. http://dx.doi.org/10.1515/aucts-2015-0037.
Повний текст джерелаАнотація:
Abstract Research and development activities presented were aimed at obtaining a nanocomposite polyurethane matrix with special anti-wear, anti-slip and fire-resistant properties. Research and development works were materialized by obtaining polyurethane nanocomposite matrix, by its physico-chemical modification in order to give the desired technological properties and by characterization of the obtained material. Polyurethane nanocomposite matrix was obtained by reacting a PETOL 3 type polyetherpolyol (having a molecular weight of 5000 UAM) with a diisocyanate under well-established reaction conditions. Target specific technological properties were obtained by physical and chemical modification of polyurethane nanocomposite matrix. The final result was getting a pellicle material based on modified nanocomposite polyurethane, with anti-wear, anti-slip and fire-resistant properties, compatible with most substrates encountered in civil and industrial construction: wood, concrete, metal.
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Ma, Xingfa, Caiwei Li, Mingjun Gao, Xintao Zhang, You Wang, and Guang Li. "Interface Optimization of Metal Quantum Dots/Polymer Nanocomposites and their Properties: Studies of Multi-Functional Organic/Inorganic Hybrid." Materials 16, no. 1 (December 23, 2022): 150. http://dx.doi.org/10.3390/ma16010150.
Повний текст джерелаАнотація:
Nanomaterials filled polymers system is a simple method to produce organic/inorganic hybrid with synergistic or complementary effects. The properties of nanocomposites strongly depend on the dispersion effects of nanomaterials in the polymer and their interfaces. The optimized interface of nanocomposites would decrease the barrier height between filler and polymer for charge transfer. To avoid aggregation of metal nanoparticles and improve interfacial charge transfer, Pt nanodots filled in the non-conjugated polymer was synthesized with an in situ method. The results exhibited that the absorbance of nanocomposite covered from the visible light region to NIR (near infrared). The photo-current responses to typical visible light and 808 nm NIR were studied based on Au gap electrodes on a flexible substrate. The results showed that the size of Pt nanoparticles was about 1–2 nm and had uniformly dispersed in the polymer matrix. The resulting nanocomposite exhibited photo-current switching behavior to weak visible light and NIR. Simultaneously, the nanocomposite also showed electrical switching responses to strain applied to a certain extent. Well-dispersion of Pt nanodots in the polymer is attributable to the in situ synthesis of metal nanodots, and photo-current switching behavior is due to interface optimization to decrease barrier height between metal filler and polymer. It provided a simple way to obtain organic/inorganic hybrid with external stimuli responses and multi-functionalities.
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Rostamzadeh, Taha, H. Shahverdi, R. Sarraf-Mamoory, and A. Shanaghi. "The Effect of Reinforcement Phase on the Microstructure of Al-SiC Nanocomposite Powder Prepared via Mechanical Alloying." Advanced Materials Research 83-86 (December 2009): 764–70. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.764.
Повний текст джерелаАнотація:
Mechanical alloying is one of the most successful methods for the manufacturing of metal matrix nanocomposite powders. In this study, Al/SiC metal matrix composite (MMCp) powders with volume fractions of 5, 10, and 15 percent SiC were successfully obtained after milling the powder for a period of 25 hours at a ball to powder ratio of 15:1 using high energy planetary milling. The Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were conducted to investigate the lattice strain of the matrix phase and the microstructure of the nanocomposite powders after 1, 10, and 25 hours of milling time. Also, the morphology of the Al-5%SiC nanocomposite powder was investigated using transmission electron microscopy (TEM). The results show that with the increase of both milling time and the reinforcement phase volume fraction, the lattice strain increases and the average size of aluminum phase crystallites decreases. Eventually, after 25 hours of milling, the nanocomposite powders show a spherical-like morphology and SiC particles were distributed in an aluminum matrix with appropriate order.
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Sharma, Manjula, and Vimal Sharma. "Investigation of Thermal Expansion and Physical Properties of Carbon Nanotube Reinforced Nanocrystalline Aluminum Nanocomposite." Zeitschrift für Naturforschung A 71, no. 2 (February 1, 2016): 165–74. http://dx.doi.org/10.1515/zna-2015-0296.
Повний текст джерелаАнотація:
AbstractCarbon nanotube (CNT) reinforced nanocrystalline aluminum matrix composites are fabricated by a simple and effective physical mixing method with sonication. In this study, the microstructural characterisations and property evaluations of the nanocomposites were performed. The structural characterisations revealed that CNTs were dispersed, embedded, and anchored within the metal matrix. A strong interfacial adhesion appeared between CNTs and nanocrystalline aluminum as a result of the fabrication process. Raman and Fourier transform infrared spectroscopic studies also confirmed the surface adherence of CNTs with nanocrystalline aluminum matrix during the fabrication process. Thermal expansion behaviour of CNT-reinforced aluminum matrix composites was investigated up to 240°C using a dilatometer. The coefficient of thermal expansion of the nanocomposites decreased continuously with the increasing content of CNTs. The maximum reduction of 82% was found for 4 wt% CNTs in the nanocomposite. The coefficient of thermal expansion variation with CNTs was also compared with the predictions from the thermoelastic models. The expansion behaviour of the nanocomposites was correlated to the microstructure, internal stresses, and phase segregations. The electrical and thermal conductivity was also studied and was observed to decrease for all reinforced CNT weight fractions.
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Toader, Gabriela, Aurel Diacon, Edina Rusen, Florica Rizea, Mircea Teodorescu, Paul O. Stanescu, Celina Damian, et al. "A Facile Synthesis Route of Hybrid Polyurea-Polyurethane-MWCNTs Nanocomposite Coatings for Ballistic Protection and Experimental Testing in Dynamic Regime." Polymers 13, no. 10 (May 17, 2021): 1618. http://dx.doi.org/10.3390/polym13101618.
Повний текст джерелаАнотація:
This study describes a simple, practical, inexpensive, improved, and efficient novel method for obtaining polyurea-polyurethane-multiwall carbon nanotubes (MWCNTs) nanocomposites with enhanced mechanical properties, and their experimental testing in a dynamic regime. SEM and micro-CT investigations validated the homogeneity of the nanocomposite films and uniform dispersion of the nanofiller inside the polymeric matrix. The experimental measurements (TGA, DSC, DMA, and tensile tests) revealed improved thermal and mechanical properties of these new materials. To demonstrate that these nanocomposites are suitable for ballistic protection, impact tests were performed on aluminum plates coated with the polyurea-polyurethane MWCNTs nanocomposites, using a Hopkinson bar set-up. The experimental testing in the dynamic regime of the polyurea- polyurethane-coated aluminum plates confirmed that the nanocomposite layers allow the metal plate to maintain its integrity at a maximum force value that is almost 200% higher than for the uncoated metallic specimens.
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Sabo, Y. T., D. E. Boryo, I. Y. Chindo, and A. I. Habib. "Nanocomposites Transformed from Polystyrene Waste/Antimony, Barium and Nickel Oxides Nanoparticles with Improved Mechanical Properties." Journal of Applied Sciences and Environmental Management 25, no. 11 (February 10, 2022): 1921–25. http://dx.doi.org/10.4314/jasem.v25i11.11.
Повний текст джерелаАнотація:
In this experiment, the oxide nanoparticles were synthesized via chemical precipitation and the nanocomposites were produced using in situ polymerization method with varying nanoparticles contents ranged from 0 to 5 g. The mechanical properties of the nanocomposites were investigated and compared with the values obtained for untreated polystyrene. It was observed that the mechanical properties were higher for the nanocomposites and increase with increasing nanoparticle concentrations in the samples. It can be observed that the untreated polystyrene gave a tensile strength of 945.25 N/mm2. At high nanoparticle content of 5 g, the nanocomposite containing NiO nanoparticles showed a tensile strength of 973.83 N/mm2 while nanocomposite containing BaO nanoparticles gave a tensile strength of 968.19 N/mm2 and nanocomposite containing Sb2O3 nanoparticle gave a tensile strength of 955.53 N/mm2. The results indicate that the tensile strength and percentage elongation of all the nanocomposites improved with the addition of metal oxides nanoparticles compared with the untreated polystyrene. Slight decrease in percentage reduction in area of the nanocomposites was recorded. Conclusively, with these results, the PS/NiO nano composite showed a better trend of behaviour due to better interfacial interaction between the nanofillers and the polymer matrix followed by PS/BaO and PS/Sb2O3 nanocomposites. It is recommended that during the production of polymer nanocomposite, PS/NiO, PS/BaO and PS/Sb2O3 nanocomposites could be used as reinforcements in the construction of buildings to add structural stability to the building.