Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Fabrication of Hollow Micro-particles with Nonspherical Shapes by Surface Sol-gel Reaction

표면 솔-젤 반응을 활용한 마이크로미터 크기의 비구형상 공동 입자의 제조

  • Cho, Young-Sang (National Center for Integrated Optofluidic Systems and Department of Chemical and Biomolecular Engineering, KAIST) ;
  • Jeon, Seog-Jin (Center for Soft Matter Research, New York University) ;
  • Yi, Gi-Ra (Nano-Bio System Research Team, Seoul Center, Korea Basic Science Institute)
  • 조영상 (한국과학기술원 생명화학공학과 광자유체집적소자연구단) ;
  • 전석진 (뉴욕 대학교 물리학과 연성소재 연구 센터) ;
  • 이기라 (한국기초과학지원연구원 나노바이오시스템연구팀)
  • Received : 2007.08.07
  • Accepted : 2007.09.26
  • Published : 2007.12.31
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Abstract

We demonstrate the sol-gel coating technique of colloidal clusters for producing hollow micro-particles with complex morphologies. Cross-linked amidine polystyrene (PS) microspheres were synthesized by emulsifier-free emulsion copolymerization of styrene and divinylbenzene. The amidine PS particles were self-organized inside toluene-in-water emulsion droplets to produce large quantities of colloidally stable clusters. These clusters were coated with thin silica shell by sol-gel reaction of tetraethylorthosilicate (TEOS) and ammonia, and the organic polystyrene cores were removed by calcination at high temperature to generate nonspherical hollow micro-particles with complex morphologies. This process can be used to prepare hollow particles with shapes such as doublets, tetrahedra, icosahedra, and others.

아민기로 코팅된 단분산 폴리스티렌 입자를 제조한 뒤 톨루엔-물로 구성된 유중수 액적(oil-in-water emulsion) 내부에서 입자를 자기 조립(self-assembly)시켜 다양한 다면체(polyhedra) 구조의 콜로이드 클러스터(colloidal cluster)를 제조하였다. 콜로이드 클러스터의 표면에서 솔-젤(sol-gel) 반응을 유발한 뒤 표면이 실리카로 코팅된 복합(composite) 콜로이드 클러스터를 제조할 수 있었고 이를 주형(template)으로 활용하여 고온 소성에 의해 내부의 폴리스티렌 입자를 제거하고 마이크로미터 크기의 다양한 구조의 비구형상 공동 입자(hollow particle)를 제조하였다. 밀도구배원심분리법 (density gradient centrifugation)에 의해 폴리스티렌 구성 입자의 수와 구조가 균일한 콜로이드 클러스터를 제조할 수 있었으며 표면 솔-젤 반응에 의해 비구형상 구조의 공동 입자를 제조하였다.

Keywords

Acknowledgement

Supported by : 한국학술진흥재단

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