KR101841263B1 - 액정 박막 및 나노입자 조립체의 제조방법 - Google Patents
액정 박막 및 나노입자 조립체의 제조방법 Download PDFInfo
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Abstract
Description
도 2의 (a)는 액정 박막 상에 F-SiO2 나노입자 분산액 도포 및 분산매 건조 이후에 하나의 결함구조를 촬영한 전자현미경 이미지와 해당 단면이고, (b) 및 (c)는 대기조건에서 160의 스멕틱 상의 온도에서 열처리를 각각 1시간, 2시간을 가한 하나의 결함구조에 대한 전자현미경 이미지와 해당하는 단면이며, (d)은 4시간의 열처리 후 액정 분자들 모두가 기판으로부터 승화되어 제거된 상태에서 형성된 나노입자들의 구형 조립체를 전자현미경으로 촬영한 이미지이다.
도 3은 액정 박막의 결함 구조 에 F-SiO2 나노입자가 적층된 상태로부터 열처리를 통해 구형의 조립체까지 되는 과정을 각각(a) 최초 열처리 전과 일정 열처리 시간 후, (b) 1시간, (c) 2시간, (d) 4시간에 해당하는 편광현미경 이미지이고, 도 3의 (c)와 (d)안에 삽입된 이미지는 각 편광현미경 이미지에 해당하는 전자현미경 이미지이다.
도 4의 (a)~(f)는 F-SiO2 나노입자 분산액의 나노입자 농도를 0.001중량%에서 0.5중량%까지 변화시킴에 따라 그 조립체의 크기가 증가하는 것을 보여주는 전자현미경 이미지들이고, (g)는 정량적으로 나노입자 분산액의 농도에 따라서 나노입자 조립체의 크기의 증감을 보여주는 도표로, 도표의 x축은 로그 스케일(log-scale)의 농도 값이고, y측은 나노입자 조립체의 지름이다.
도 5는 양자점 조립체의 육방정계의 배열이 대면적에서 구현되었음을 보여주는 형광 이미지이고, 삽입된 이미지는 고속 푸리에 변환(fast Fuorier transform. FFT)으로서 배열된 양자점 조립체의 높은 규칙성을 나타낸다.
도 6의 (a)는 F-SiO2 나노입자 조립체들이 배열된 PDMS 기판의 구부린 상태의 이미지이고, (b)는 PDMS 기판 위에 형성한 F-SiO2 나노입자 조립체들이 육방정계의 규칙적인 배열을 나타낸 사진이다.
도 7의 (a)~(f)는 본 발명의 나노입자 조립체들의 배열형성 과정을 나타낸 순서도이다.
Claims (11)
- 다음 단계를 포함하는 나노입자 조립체의 제조방법:
(a) 기판 상의 승화성 액정 초분자를 가열하는 단계;
(b) 상기 가열된 액정 초분자를 스멕틱 상으로 냉각하여 주기적인 결함 구조를 갖는 액정 박막을 제조하는 단계; 및
(c) 상기 제조된 액정 박막 상에 나노입자 분산액을 도포하고 액정상 온도에서 어닐링 처리하여 나노입자들이 결함 구조 내에 갇혀 모인 나노입자 조립체를 제조하는 단계.
- 제1항에 있어서, 상기 (a) 단계 이전에 상기 기판의 표면이 친수성기를 갖도록 개질하는 단계를 추가로 포함하는 나노입자 조립체의 제조방법.
- 제2항에 있어서, 상기 기판을 폴리에틸렌이민 또는 폴리에틸렌글리콜로 코팅하거나 상기 기판 상에 실리카(silica) 또는 옥타데실트리메톡시실란(octadecyltrimethoxysilane, OTS)으로 자기조립 단분자막(self-assembled monolayer, SAM)을 형성하여 친수성기를 갖도록 개질하는 것을 특징으로 하는 나노입자 조립체의 제조방법.
- 제1항에 있어서, 상기 승화성 액정 초분자는 양 말단이 각각 플루오린(F) 계열의 탄소사슬과 에스테르 그룹으로 치환되고, 직접 결합된 2개의 벤젠 고리를 갖는 막대형 액정 분자인 것을 특징으로 하는 나노입자 조립체의 제조방법.
- 제1항에 있어서, 역원뿔상으로 함몰된 결함 구조가 형성되는 것을 특징으로 하는 나노입자 조립체의 제조방법.
- 삭제
- 제1항에 있어서, 도포한 다음 분산매를 건조시키는 단계를 추가로 포함하는 나노입자 조립체의 제조방법.
- 제1항에 있어서, 상기 나노입자 분산액 중 나노입자의 농도를 조절하여 나노입자 조립체의 크기를 조절하는 것을 특징으로 하는 나노입자 조립체의 제조방법.
- 제1항에 있어서, 상기 나노입자는 실리카 나노입자, 금속 나노입자, 금속 산화물 나노입자, 양자점(quantum dot) 및 양자 막대(quantum rod)로 구성된 군에서 선택된 1종 이상인 것을 특징으로 하는 나노입자 조립체의 제조방법.
- 제1항에 있어서, 상기 나노입자 조립체는 구형인 것을 특징으로 하는 나노입자 조립체의 제조방법.
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