Article
  • Thermochromic Hybrid Nanoparticles Comprising a Tungsten-Doped Vanadium Dioxide Core and a Poly(N-isopropylacrylamide) Shell Structure
  • Sang Won Jung, Sang Hwi Park*, Jung Whan Yoo*, and Juhyun Park

  • Department of Intelligent Energy and Industry, School of Chemical Engineering and Materials Science, Institute of Energy-Converting Soft Materials, Chung-Ang University, Seoul 06974, Korea
    *KNW R&D Center, Donyu 2-ro 60, Paju-eup, Paju-city, Gyeonggi-do 10832, Korea

  • 텅스텐이 도핑된 바나듐산화물 코어와 폴리이소프로필아크릴아마이드 쉘 구조를 보유한 열변색 하이브리드 나노입자
  • 정상원 · 박상휘* · 유중환* · 박주현

  • 중앙대학교 지능형에너지산업학과, 화학신소재공학부, *KNW연구소

  • Reproduction, stored in a retrieval system, or transmitted in any form of any part of this publication is permitted only by written permission from the Polymer Society of Korea.

Abstract

Hybrid nanoparticles based on tungsten-doped vanadium dioxide (WxVO2) nanoparticles and poly(N-isopropylacrylamide) (PNIPAm) for thermochromic smart window applications were synthesized via silica layer formation using (3-mercaptopropyl)trimethoxysilane (MPTMS) followed by the surface-mediated free radical polymerization of PNIPAm, resulting in the aqueous dispersion of the hybrid nanoparticles. The metal-insulator transition of the WxVO2 core at around 28 °C and the lower critical solution temperature of PNIPAm at around 32 °C enable the aqueous dispersion of the hybrid nanoparticles to present an efficient thermochromicity depending on the temperature over a broad spectral range from visible to near-infrared light. The difference in the solar modulation was over 25%, while the luminous transmittance (Tlum) significantly decreased from 85% to 15% with increasing WxVO2 composition in the hybrids. Our results suggest that the hybridization of WxVO2 and PNIPAm is a potential methodology for preparing efficient thermochromic materials


열변색 스마트 창호 소재로서 텅스텐이 도핑된 바나듐이산화물(WxVO2) 나노입자와 폴리이소프로필아크릴아미드(PNIPAm)의 하이브리드 나노입자가 실리카 쉘 형성 및 PNIPAm의 표면라디칼 중합반응에 의해 합성되었다. 하이브리드 나노입자의 수분산액은 섭씨 28도의 금속-절연체 전이온도를 보유한 WxVO2 코어와 섭씨 32도의 하한 임계 용액온도를 보유한 PNIPAm 쉘의 특성으로 인해 가시광선에서 근적외선까지의 넓은 스펙트럼 범위에서 효과적인 열변색 특성을 보였다. 하이브리드 나노입자에서 PNIPAm의 함량을 고정시키고 WxVO2의 함량을 변화시키며 특성을 측정한 결과 섭씨 20도에서 40도의 온도 변화에서 25% 이상의 태양광 변조 변화를 구현하였으며 WxVO2의 함량증가에 따라 입자의 증가된 뭉침현상에 의해 투과도는 85%에서 15%까지 급격하게 감소하였다. 본 연구결과는 WxVO2와 PNIPAm의 하이브리드화가 효율적인 열변색 소재를 제조하기 위한 주요 기술이 될 수 있음을 보여준다


Keywords: vanadium oxide, tungsten doping, poly(N-isopropylacrylamide), thermochromic, smart windows

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2018 Impact Factor : 0.500
  • Indexed in SCIE

This Article

  • 2021; 45(2): 286-293

    Published online Mar 25, 2021

  • 10.7317/pk.2021.45.2.286
  • Received on Nov 3, 2020
  • Revised on Dec 14, 2020
  • Accepted on Dec 15, 2020

Correspondence to

  • Juhyun Park
  • Department of Intelligent Energy and Industry, School of Chemical Engineering and Materials Science, Institute of Energy-Converting Soft Materials, Chung-Ang University, Seoul 06974, Korea

  • E-mail: jpark@cau.ac.kr