期刊
OPTICAL MATERIALS
卷 97, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.optmat.2019.109367
关键词
Smart window; Thermochromic hydrogel; Solar modulation; Energy saving
资金
- National Natural Science Foundation of China of China [51673040]
- Natural Science Foundation of Jiangsu Province [BK20171357, BK20180366]
- Fundamental Research Funds for the Central Universities [3207048418, 2242018k30008]
- Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu [BA2018045]
- Prospective Joint Research Project of Jiangsu Province [BY2016076-01]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [1107047002]
- Scientific Innovation Research Foundation of College Graduate in Jiangsu Province [KYLX16_0266]
Passively responsive thermochromic smart window, which can modulate indoor incident solar light automatically at relatively high outdoor temperature, is a practical energy-saving device for construction and automotive industries. In this paper, a thermochromic composite hydrogel film based on W-doped vanadium dioxide (W-VO2), poly N-isopropyl acrylamide (PNIPAM) and polyacrylamide (PAM) is presented and this hydrogel film was prepared between two quartz substrates to form the sandwich structured smart window. In this thermochromic system, 2 wt% monoclinic W-VO2 were dispersed in the hydrogel film with the thickness of 0.1 mm. The introduction of PAM changes the flow-state PNIPAM microgel to hydrogel, which dramatically improved the practicality of the PNIPAM-based smart window. When the outdoor temperature is higher than 40 degrees C, the solar modulation capacity of this passive smart window, with a high luminous transmittance of 72% at 25 degrees C, can reach 46.3%, The smart window possesses high solar modulation ability and more than 20% luminous transmittance even after 40 times high temperature durability tests.
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