Self-adjusting smart windows based on polymer-dispersed liquid crystals

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• 作者：Daniela Cupelli ; Fiore Pasquale Nicoletta ; Sabrina Manfredi ; Marco Vivacqua ; Patrizia Formoso ; Giovanni De Filpo ; Giuseppe Chidichimo
• 关键词：Smart windows ; Liquid crystals ; PDLC
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2009
• 出版时间：November 2009
• 年：2009
• 卷：93
• 期：11
• 页码：2008-2012
• 全文大小：364 K

文摘

The control of sunlight can be achieved either by electrochromic or polymer-dispersed liquid crystal (PDLC) smart windows. We have recently shown that it is possible to homeotropically align fluid mixtures of low molecular mass liquid crystal with a negative dielectric anisotropy, and a liquid crystalline monomer, in order to obtain electrically switchable chromogenic devices. They are new materials useful for external glazing. In fact, they are not affected by the classical drawbacks of PDLCs. In this paper we present a new self-switchable glazing technology based on the light-controlled transmittance in a PDLC device. The self-adjusting chromogenic material, which we obtain, is able to self-increase its scattering as a function of the impinging light intensity. The relationship between the electro-optical response and the physical–chemical properties of the components has been also investigated.