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  • 08월 18일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis of nanoparticles in the continuous process, and their surface engineering

2011년 8월 1일 18시 33분 27초
MAT1-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 14시 : 55분
재료화학 - Microfluidic-Based Materials Chemistry
저자 및
울산과학기술대학교 친환경에너지공학부, Korea
The idea to design the continuous process could be related to the development of new nanomaterials using microfluidic system. Firstly, we prepare the microfluidic device using MEMS technique and then investigate the kinetics of the synthetic reaction of nanomaterials in the microfluidic device. We’ve made great efforts to improve the reactor design to be available in high temperature and high pressure far from the normal condition. In the previous single-phase laminar flow, diffusion is the only means of mixing. As a result of the parabolic fluid-velocity profile, particles near the wall spend more time in the reactor than those in the center, resulting in broad residence time distributions (RTDs). We achieved the supercritical flow through the fabrication of high temp, and high pressure microfluidic reactor up to 450 °C, 200 bars by adopting the compression part, instead of the previous epoxy glue or glass soldering. In the supercritical condition, the hexane solvent itself (liquid or supercritical) allows decreasing significantly the effect of RTD on the size distribution of the QDs because of its low viscosity, compared to squalane. Then, under its supercritical phase, high supersaturations can be obtained in hexane, providing high nucleation rate, which produce more nuclei and reduce the size distribution. Also, perfect mixing that cannot separate the liquid slug and gas zone brings material from the wall to the center of the channel, inducing the narrower size distributions. We also successfully extend the microfluidic work to the synthesis of other nanomaterials under high pressure.