Metamaterial Hybrid Smart Window Based on Nanoporous VO2 Microparticles in Liquid Crystal for Heat Blocking and Visibility Control

Sofiia Barinova, You Wei Wu, Sheng Hsiung Yang, Ibrahim Abdulhalim

Research output: Contribution to journalArticlepeer-review

Abstract

With the growing concerns over energy consumption and climate change, the development of smart windows has become an area of intense research. In this paper, we report on the fabrication and testing of a hybrid smart window based on vanadium dioxide (VO2) nanoporous microparticles (NMPs) embedded in a liquid crystal (LC). The metamaterial composite is scattering normally due to the formation of domains near each particle with a different refractive index than that of the surrounding LC molecules and becomes transparent as voltage is applied. Since the VO2 particles are on the microscale, their absorption in the infrared is high partially due to the multiple reflections and scattering events. As a result, they block almost completely the infrared part of the solar spectrum, while enough visible light is transmitted. The applied voltage then controls the visibility, thus forming a hybrid window in which the heat is blocked, and the visibility is controlled with voltage. To evaluate it as a smart window, we prepared three devices, one with VO2 NMPs, one with porous Si NMPs, and one with only LC showing that the first blocks more heat from entering the house than the second and the third. This VO2-NMP/LC smart window device has potential applications in energy-efficient buildings and other related fields.

Original languageAmerican English
Pages (from-to)7587-7595
Number of pages9
JournalACS Applied Energy Materials
Volume6
Issue number14
DOIs
StatePublished - 24 Jul 2023

Keywords

  • controlled scattering
  • heat blocking
  • liquid crystals
  • metamaterials
  • smart windows
  • vanadium dioxide

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Electrical and Electronic Engineering
  • Electrochemistry

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