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  • Title/Summary/Keyword: nanocomposite materials

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Evaluation on the Material Properties of Cement Mortar with CNC (CNCs를 첨가한 시멘트 모르타르의 기초 물성 평가)

  • Kang, Yong-Hak;Lim, Gwi-Hwan
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.263-264
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    • 2018
  • Recently, interest in making nanocomposite materials for construction utilizing the excellent physical properties of nano materials is increasing. In this study, basic properties of mortar were evaluated by the dispersion condition of cellulose nano-crystals (CNCs) extracted from nanocellulose and the feasibility of the study was examined. As a result, it was confirmed that the flexural strength and the compressive strength were increased by increasing the dispersion time of the CNCs and by using the ultrasonic dispersing device and the magnetic stirrer together.

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Preparation and Characteristics of High Voltage Liquid Silicone Rubber by Modified Cross-linking Agent

  • Jung, Se-Young;Kim, Byung-Kyu
    • Transactions on Electrical and Electronic Materials
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    • v.10 no.1
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    • pp.9-15
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    • 2009
  • There is a growing demand for a high voltage silicone rubber composite with high mechanical property and high electrical property. The effect of modified cross-linking agent on the mechanical, electrical properties, and short-circuit test performance of silicone rubber insulators have been investigated. To use base polymer, the various silicone polymers were prepared by the equilibrium polymerization. Aluminum trihydrate surface was treated by vinyl silane. Liquid silicone rubber nanocomposite was prepared from the compounding of VPMPS, HPDMS, catalyst, and alumina trihydrate modified with 1,3,5-trivinyl-l,3,5-trimethylcyclotrisiloxane. The mechanical property and electrical property for insulation materials were measured, indicating the high tensile strength and the good short-circuit property.

TiB2-Cu Interpenetrating Phase Composites Produced by Spark-plasma Sintering

  • Kwon, Young-Soon;V. Dudina, Dina;I. Lomovsky, Oleg;A. Korchagin, Michail;Kim, Ji-Soon
    • Journal of Powder Materials
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    • v.10 no.3
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    • pp.168-171
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    • 2003
  • Interpenetrating phase composites of TiB2-Cu system were produced via Spark-Plasma Sintering (SPS) oi nanocomposite powders. Under simultaneous action of pressure, temperature and electric current titanium diboride nanoparticles distributed in copper matrix move, agglomerate and form a fine-grained skeleton. Increasing SPS-temperature and he]ding time promote densification due to local melting of copper matrix When copper melting is avoided the compacts contain 17-20% porosity but titanium diboride skeleton is still formed representing the feature of SPS . High degree of densification and formation of titanium diboride network result in increased hardness of high-temperature SPS-compacts.

Effect of Organically Modified Layered Silicate on Thermal, Mechanical, and Electrical Properties of Epoxy-Based Nanocomposites

  • Park, Jae-Jun;Kwon, Soon-Seok;Lee, Jae-Young
    • Transactions on Electrical and Electronic Materials
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    • v.12 no.4
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    • pp.135-139
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    • 2011
  • In an effort to develop new electrical insulation materials, four different kinds of organically modified layered silicate were incorporated into an epoxy matrix to prepare nanocomposites for electrical insulation. Five wt% of organically modified layered silicates were processed in a planetary centrifugal mixer in an epoxy matrix, and the thermal, mechanical, and electrical properties of the cured epoxy/layered silicate were investigated. The morphology of the nanoscale silicate dispersed in the epoxy matrix was observed using transmission electron microscopy, and the interlayer distance was measured by wide-angle X-ray scattering diffraction analysis.

Magnetic Properties of Activated Quartz Nanocomposite

  • N.N., Mofa;T.A., Ketegenov;Z.A., Mansurov;Soh, Hyun-Jun;Soh, Dea-Wha
    • Journal of the Speleological Society of Korea
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    • no.78
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    • pp.9-15
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    • 2007
  • The materials showing high structure dispersion with functional properties were developed on the quartz base and those were obtained by mechano-chemical reaction technology. Depending on the processing conditions and subsequent applications the materials produced by mechano-chemical reaction show concurrently magnetic, dielectric and electrical properties. The obtained magnetic-electrical powders classified by aggregate complex of their features as segnetomagnetics, containing a dielectric material as a carrying nucleus, particularly the quartz on that surface one or more layers of different compounds were synthesized having thickness up to 1050nm showing magnetic, electrical properties and others. The similarity of the structure of surface layers of quartz particles subjected to mechano-chemical processing and nano-structure cluspol (clusters in a polymer matrics) material was alsoconfirmed by the fact that the characteristics of ferromagnetic quartz of insulating nano-composite powder were changed with time, after its preparing process was completed.

Superhard Mo-Al-N films Composed of Grains with Different Crystallographic Orientations and/or Lattice Structures

  • Musil, J.;Stadnik, T.;Cernansky, M.
    • Journal of Surface Science and Engineering
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    • v.36 no.1
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    • pp.22-26
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    • 2003
  • This short communication reports on the experiment which demonstrates that superhard nanostructured films with hardness of about 40 GPa and greater can be composed not only of two or more nanocrystalline and/or amorphous phases of different materials, as it is in the case of nanocomposite coatings, but also that can be formed by a mixture of small (<10 nm) nanocrystalline grains of the same material with different crystallographic orientation and/or lattice structures. This finding opens new possibilities to develop advanced nanostructured materials with enhanced physical and functional properties.

Intercalation Behavior of Clay in Polypropylene/Montmorillonite/Wood Nanocomposites (폴리프로필렌/몬모릴로나이트/목분 나노복합체에서의 클레이 박리거동)

  • Kim, Jin Sung;Lee, Sun Young;Yoon, Ho Gyu
    • Journal of the Korean Society of Industry Convergence
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    • v.13 no.2
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    • pp.93-98
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    • 2010
  • Polypropylene / montmorillonite / wood flour nanocomposites are melt-mixed by using a twin screw extruder. The montmorillonite is intercalated by the wood flour and the basal spacing of montmorillonite is increased with increasing the content of wood flour. The exfoliation constantly occurs by adding more than 10 wt.% of maleic anhydride-grafted polypropylene as the compatibilizer, which is used for improving the interfacial adhesion between matrix and filler. Also, the maleic anhydride-grafted polypropylene enhances the mechanical properties of the nanocomposites.

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POLYPROPYLENE/CLAY NANOCOMPOSITES FOR AUTOMOTIVE APPLICATIONS

  • HONG C. H.;LEE Y. B.;JHO J. Y.;NAM B. U.;HWANG T. W.
    • International Journal of Automotive Technology
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    • v.6 no.6
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    • pp.665-670
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    • 2005
  • Nanocomposites of polypropylene with organically modified clays were compounded on a twin-screw extruder by two-step melt compounding of three components, i.e., polypropylene, maleic anhydride grafted polypropylene (PP-g-MA), and organically modified clay. The effect of PP-g-MA compatibilizers, including PH-200, Epolene-43, Polybond-3002, Polybond-3200, with a wide range of maleic anhydride (MA) content and molecular weight was examined. Morphologies of nanocomposites and their mechanical properties such as stiffness, strength, and impact resistance were investigated. X-ray diffraction patterns showed that the dispersion morphology of clay particles seemed to be determined in the first compounding step and the further dispersion of clays didn't occur in the second compounding step. As the ratio of PP-g-MA to clay increased, the clay particles were dispersed more uniformly in the matrix resin. As the dispersibility of clays was enhanced, the reinforcement effect of the clays increased, however impact resistance decreased.

Synthesis of anisotropic defective polyaniline/silver nanocomposites

  • Kamblea, Vaishali;Kodwania, Gunjan;Sridharkrishna, Ramdoss;Ankamwar, Balaprasad
    • Advances in nano research
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    • v.2 no.2
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    • pp.111-119
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    • 2014
  • The chemical synthesis of anisotropic defective polyaniline/Ag composite (PANI/Ag) is explored using silver nitrate (AgNO3) as the precursor material. This study provides a simple method for the formation of PANI/Ag nanocomposites at two different aniline concentrations 5μl (PANC5) and 10μl (PANC10). The composite PANC5 exhibits UV-Visible absorption peaks at 436 nm and 670 nm whereas, PANC10 exhibits absorption peaks at 446 nm and 697 nm. This shift is caused by the strong interaction between polyaniline and silver. The characterized FTIR peaks observed at around 3410cm1 (PANC5) and 3420cm1 (PANC10) was due to the N-H stretching vibrations. The appearance of a broad band instead of a sharp peak can be attributed due to the presence of a high concentration of N-H groups in the nanocomposite. The TEM images show that the sample contains defective spherical, truncated triangular and rod shaped particles. The results showed that the PANI/Ag nanocomposites are composed of nano-sized particles of 43-53 nm that contain Ag domains of 33-37 nm with polymer thickness 5.7-11.2 nm at two different aniline concentrations.

Bio-Inspired Synthesis of a Silicate/PMMA Composite

  • Nam, Kyung Mok;Lee, Yoon Joo;Kwon, Woo Teck;Kim, Soo Ryong;Shin, Dong-Geun;Lim, Hyung Mi;Kim, Hyungsun;Kim, Younghee
    • Journal of the Korean Ceramic Society
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    • v.51 no.1
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    • pp.7-10
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    • 2014
  • Abalone shell is composed of 95 wt% CaCO3 platelets and 5 wt% of a protein-rich organic matrix which acts as an adhesive layer, connecting aragonite tablets, thus maintaining the structural integrity of the composite. By mimicking abalone shell, we prepared a silicate plate/polymer nanocomposite by infiltrating PMMA between silicate layers and warm-pressing them at 200C for 1 h under 15 tons to make organic-inorganic composite materials. To examine the organic-inorganic composite materials after the warm-pressing procedure, the composite sample was analyzed with FE-SEM and TG. The bending strengths and densities of the composites prepared by a silicate plate and PMMA after the warm-pressing process were ~140 MPa and 1.5, respectively.