Thermochromic Hybrid Nanoparticles Comprising a Tungsten-Doped Vanadium Dioxide Core and a Poly(N-isopropylacrylamide) Shell Structure

국문 초록 (Abstract)

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 하한임계 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 WxVO₂효율적인 열변색 소재를 제조하기 위한 주요 기술이 될 수 있음을 보여준다.

다국어 초록 (Multilingual 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.

목차 (Table of Contents)

• 초록
• Abstract
• Introduction
• Experimental
• Results and Discussion
• Conclusions
• References

참고문헌 (Reference)

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