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Microfluidic Synthesis of Microfibers Based on Regeneration of Cellulose from Ionic Liquids
Sung Tae Kim(김성태),Sung-rheb Cho(조성립),Minyung Song(송민영),Suk Tai Chang(장석태) 한국고분자학회 2015 폴리머 Vol.39 No.4
마이크로플루이딕 디바이스 내에서 셀룰로오스가 녹아있는 이온성 액체(1-에틸-3-메틸-이미다졸리움 아세테이트)로부터 셀룰로오스의 추출을 통한 직사각형의 단면적을 가지는 셀룰로오스 마이크로 파이버를 제조하였다. 본 연구에서 제안하는 방법은 빠른 시간 내에 간단하게 천연고분자 마이크로 파이버를 제작하기에 적합한 제조방법으로 적용가능하며, 이온성 액체와 주변 글리세린 용액의 유속비와 용액의 점도에 따라 다양한 크기의 셀룰로오스 마이크로 파이버를 제조하였다. Rectangular cellulose microfibers were synthesized by regenerating cellulose from an ionic liquid, 1-ethyl-3-methylimidazolium acetate, in a hydrodynamic flow-focusing microfluidic device. This technique is a fast and single-step approach for producing natural polymer microfibers. The dimensions of the cellulose microfibers were readily controlled by a simple variation of the core-sheath flow rate and the viscosity of fluids.
입자성장 및 집합조직 발달에 미치는 초기 입도 영향의 몬테칼로 시뮬레이션
황선근,이효남,장석태,류회수 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.11
The effect of the initial grain size on grain growth and texture evolution was studied by the Monte-Carlo simulation with a condition of isotropic grain boundary energy and mobility. The initial microstructure was composed of six different texture components which were classified by the grain size. It was shown that the texture component of smaller grains and/or grains with less number of sides than those of the average grains disappeared at the early stage of growth regardless of its initial areal fraction. Shrinking of the small grains reduced drastically the total energy of the system but it did not affect the grain growth kinetics. The texture components possessed by the larger grains sharpened continuously during growth with their intensity proportional to the areal fraction.
무한 기지내 한개 원형입자의 성장속도에 대한 2차원 몬테칼로 시뮬레이션
김병기,황선근,이효남,정형식,장석태 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.7
A computer program for a Monte Carlo simulation of grain growth based on the Ising model was developed. The system in the model comprised of a square lattice with each lattice site having an alternative spin of two kinds, either `up' or `down'. Verification of the program confirmed a cluster forming below the critical transition temperature T_0. Starting with a two-dimensional circular grain we studied the grain growth kinetics at a given temperature. A t^(½) time dependence growth rate was found, which was in accord with the classical curvature-driven growth rate theory. Increasing the temperature resulted in a decline of the growth rate at a given Monte Carlo step that appeared as a reduction of the coefficient of the time term. This phenomenon was attributed to abnormal curvature formation at local areas of the grain boundary due to enhanced fluctuation of the lattice sites at high temperature.