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Preparation of Silica Nanoparticles via Two-Step Process Utilizing Mixed Chlorosilane Residues
Su, Yonghong,Xu, Bugang,Cai, Jixiang,Chen, Liang,Huang, Bing The Korean Ceramic Society 2018 한국세라믹학회지 Vol.55 No.6
We propose an economic and facile method for the preparation of silica nanoparticles through a two-step process utilizing chlorosilane residues. Mixed chlorosilane residue was alcoholized with absolute ethanol as a first step to form tetraethoxysilane (TEOS). The TEOS was then utilized as a silicon source to synthesize silica nanoparticles in a sol-gel method. The alcoholysis process was designed and optimized utilizing the Taguchi experimental design method and the yield of TEOS was as high as 82.2% under optimal synthetic conditions. Similarly, the Taguchi method was also utilized to study the effects of synthesis factors on the particle size of silica nanoparticles. The results of statistical analysis indicate that the concentration of ammonia has a greater influence on particle size compared to the mass fractions of TEOS and polyethylene glycol (4.6% and 9.7%). The purity of the silica particles synthesized in our experiments is high, but the specific surface area and pore volume are small.
Raman Scattering Study of Relaxor Ferroelectric Pb(Sc1/2Nb1/2)O3 Crystals
Kohei Suzuki,SeijiKojima,Muhtar Ahart,Yonghong Bing,Zuo-Guang Ye 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.8
The effects of B-site ordering and vacancies were studied in the relaxor ferroelectric Pb(Sc1/2Nb1/2)O3 (PSN) family by using Raman scattering spectroscopy. Differences with Raman spectra and the depolarization ratios were clearly observed among B-site disordered PSN (PSN-D),B-site ordered with lead/oxygen vacancies PSN (PSN-OV ), and 0.7Pb(Sc1/2Nb1/2)O3-0.3PbTiO3(PSN-30PT) single crystals. The temperature dependence of the depolarization ratio of PSN-30PT was also studied to clarify the ferroelectric phase transitions and the polarization fluctuations in the polar nanoregions.