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Quick Fabrication of Three Dimensional Colloidal Crystals and Their Applications

3차원 콜로이드 광결정의 고속 제작 및 응용

  • Lee, Su Jin (Department of Chemical Engineering, Kyung Hee University) ;
  • Im, Sang Hyuk (Department of Chemical Engineering, Kyung Hee University)
  • Received : 2013.06.11
  • Accepted : 2013.07.15
  • Published : 2013.10.01

Abstract

On evaporation of water in polystyrene colloidal emulsion, the polystyrene colloidal particles are instantly protruded on the surface of water and are self-assembled by capillary force among the protruded particles. At the same time, the assembly of polystyrene colloidal particles is occurred on the surface of water owing to its lower effective density than water. Here we devised that the three-dimensional polystyrene colloidal crystals are quickly transferred onto the glass substrate by constructing wettable confined geometry on the glass substrate. We also applied the three-dimensional colloidal crystals to optical filters reflecting certain wavelength of light selectively by tuning the size of building blocks and incident angle of light.

폴리스티렌 콜로이드 에멀젼 용액에서 물이 증발하게 되면 순간적으로 폴리스티렌 콜로이드 입자들이 물 표면으로 튀어나오게 되며 이러한 입자들 간의 모세관력에 의해 자기조립이 일어나게 되는데, 폴리스티렌 입자의 경우 유효밀도가 물 보다 작아 물 표면 위에 3차원 광결정을 형성하게 된다. 본 논문에서는 이러한 현상을 젖음성이 있는 제한된 공간을 가지는 구조를 가지는 유리기판 위에서 일어나도록 함으로써, 3차원의 폴리스티렌 콜로이드 결정이 고속으로 생성되고 기판위로 옮겨질 수 있도록 고안하였다. 고속으로 제작된 폴리스티렌 콜로이드 광결정은 폴리스티렌 입자의 크기 및 광결정 필름의 입사각을 조절하여 가시광 전체 영역의 빛을 선택적으로 반사하는 광필터로 적용해 보았다.

Keywords

References

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