Electrically adjustable thermotropic windows based on polymer gels

Tamás Gyenes, András Szilágyi, Tünde Lohonyai, Miklós Zrínyi

Research output: Contribution to journalArticle

26 Citations (Scopus)


Several attempts have been made recently in order to develop "Smart" windows, which can moderate light and heat intensities. Based upon the phase transitions of polymer gels, a novel electrically adjustable window, which includes a gel layer, has been developed in our laboratory. Unlike other electrically controlled structures, the optical properties of the gel layer are abruptly modified by the Joule heat of audio frequency AC current. The so-called "gel-glass" becomes opaque when the temperature exceeds a critical value and changes back to its original transparent state when it is cooled down again. This method results in fast control and relatively low operational cost. Two types of gel-glasses-active and passive structures-have been developed and investigated. In this paper, We demonstrate the structural build-up and working of these novel electrically adjustable thermotropic windows. Experimental studies have been made at different frequencies and voltages. The optical properties, as well as the energy balance of the systems, have been reported.

Original languageEnglish
Pages (from-to)757-762
Number of pages6
JournalPolymers for Advanced Technologies
Issue number11-12
Publication statusPublished - Jan 1 2003



  • AC voltage
  • Electric control
  • Gel-glass
  • Responsive gel
  • Smart window
  • Transparent-opaque transition

ASJC Scopus subject areas

  • Polymers and Plastics

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