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공업화학(전기화학, 분석화학 포함) 촉매/반응공학 실란 커플링제에 의해 표면이 개질된 실리카 나노입자의 분광학적 분석
송성규 ( Seong Kyu Song ),김정혜 ( Jung Hye Kim ),황기섭 ( Ki Seob Hwang ),하기룡 ( Ki Ryong Ha ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.2
In this study, we used 3-(trimethoxysilyl)propylmethacrylate(MPS) silane coupling agent for surface modification of silica nanoparticles. We studied effects of reaction conditions such as solvent pH, MPS hydrolysis time, reaction lime, and molar ratio of MPS to Si-OH groups on silica nanoparticle surfaces, on the surface modification reactions of silica nanoparticles. Fourier Transform Infrared Spectroscopy(FTIR), Elemental Analysis(EA) and solid state cross-polarization magic angle spinning(CP/MAS) Nuclear Magnetic Resonance Spectroscopy(NMR) techniques were used to determine the type and the degree of surface modification. We found MPS reacts preferentially with Si-OH groups of the silica nanoparticles as monomeric form at solvent pH=4.5. But increasing hydrolysis time of MPS from 30mins to 90 mins, and molar ratio of MPS to Si-OH groups on silica nanoparticle surfaces, we found that MPS reacts preferentially with Si-OH groups of the silica nanoparticles as oligomeric form.
고낙영(Nak-Young Ko),이본영(Bon-Young Lee),송성규(Seong-Kyu Song),박우진(Woo-Jin Park),서석태(Seok-Tae Seo),변영재(Franklin Bien) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.7
본 연구에서 페라이트를 이용한 자기장 무선전력전송 안테나를 제안하였다. 기존에 추가접지가 있어야 자기장 무선전력전송이 가능하였던 점을 페라이트의 특성을 이용하여 추가접지 없이 자기장 무선전력전송이 가능하게 하였다. 페라이트는 자기장의 차폐효과가 있고 누설전력을 줄여주어 전송효율을 높여준다. 페라이트를 이용하여 자기장 무선전력전송을 위한 안테나를 제안하였고 실험을 통해 5W 자기장 무선전력전송 되는 것을 확인하였다. 본 논문에서 제안한 무선전력전송은 금속을 매개로 하는 자기장 무선전력전송으로 사물인터넷 분야에 다양하게 응용 될 수 있다. In this paper, we propose magnetic field wireless power transfer antenna using Ferrite. It is possible to transfer magnetic field wireless power without independent ground by using characteristic of ferrite in the point that conventional magnetic field wireless power transfer was possible with independent grounding. Ferrite has a shielding effect of magnetic field and reduces leakage power, thereby improving transfer efficiency. We propose an antenna for magnetic field wireless power transfer using ferrite and confirmed that it is transmitted by 5W magnetic field wireless power through experiments. The wireless power transfer proposed in this paper can be applied variously to the Internet of things by using the magnetic field wireless power transfer through the metal.