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- 저자 : Laongnuan Srisombat (검색결과 2 건)
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Jeeranan Nonkumwong,Laongnuan Srisombat,Supon Ananta 한국물리학회 2014 Current Applied Physics Vol.14 No.9
In this work, BaTiO3 ceramics modified with 0.5 mol% Au nanoparticles were fabricated by using a combination of the solid-state reaction and pressureless-sintering techniques. By employing a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), Archimedes principle and dielectric measurement techniques, it was found that no phases other than tetragonal BaTiO3 were observed in all ceramics. In contrast to the tetragonality, the relative density, grain size and maximum dielectric constant at Curie temperature of the ceramics were found to increase with sintering temperature. In addition, it has been found that, under suitable sintering temperature, dense perovskite nanogold modified BaTiO3 ceramics with fine-grained microstructure (~1 mm) and better dielectric properties than those of gold-free ceramics can be produced.
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Byun, Hongsik,Hu, Jiayun,Pakawanit, Phakkhananan,Srisombat, Laongnuan,Kim, Jun-Hyun IOP 2017 Nanotechnology Vol.28 No.2
<P>The <I>in situ</I> formation of dielectric silica (SiO<SUB>2</SUB>) particles was carried out in the presence of temperature-responsive poly(<I>N</I>-isopropylacrylamide) particles. Unlike the typical sol-gel method used to prepare various SiO<SUB>2</SUB> particles, the highly uniform growth of SiO<SUB>2</SUB> particles was achieved within the cross-linked polymer particles (i.e., the polymer particles were filled with the SiO<SUB>2</SUB> particles) simply by utilizing interfacial interactions, including the van der Waals attractive force and hydrogen bonding in nanoscale environments. The structural and morphological features as well as the thermal behaviors of these composites were thoroughly examined by electron microscopes, dynamic light scattering, and thermal analyzers. In particular, the thermal properties of these composites were completely different from the bare polymer, SiO<SUB>2</SUB> particles, and their mixtures, which clearly suggested the successful incorporation of multiple SiO<SUB>2</SUB> particles within the cross-linked polymer particles. Similarly, titanium oxide (TiO<SUB>2</SUB>) particles were easily embedded within the polymer particle template which exhibited improved overall properties. As a whole, understanding <I>in situ</I> formation of nanoscale inorganic particles within polymer particle templates can allow for designing novel composite materials possessing enhanced chemical and physical properties.</P>
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