Science and technology of thermochromic materials
- Ohio Univ., Athens, OH (United States). Dept. of Chemistry
- Washington State Univ., Pullman, WA (United States). Dept. of Chemistry
The color of a substance in general depends upon its state and upon the external forces it experiences, both past and present. One of the simplest methods of attempting to change the state of a material is to vary its temperature. Thermochromism is a noticeable dependence of the color of a substance on temperature. This is thus one of the easier chromogenic effects to detect. Since the changes triggered by temperature variation often are indicative of the effects that can be induced by other means, it is convenient to use the observation of thermochromism as an indication of the possible existence of other chromogenic behavior. Reversibility is an important factor to be considered for thermochromic materials. A compound which decomposes as it is heated may be totally irreversible or may be irreversible because a product of chemical change is removed and not replaced. For reversible systems, long term stability is important, although there are many uses in which stability over a few thermal cycles are adequate for the purpose. The possibility of an indefinitely large number of cycles is frequently limited by secondary and side reactions that may be present. There are a number of excellent reviews of the subject of thermochromism. The following sections of this chapter give an overview of the research done in polymeric, organic, and metal containing systems, as well as a summary of applications development, in the past two years. 165 refs., 9 figs., 1 tab.
- OSTI ID:
- 86076
- Report Number(s):
- CONF-8809123-; ISBN 0-8194-0069-6; TRN: IM9534%%147
- Resource Relation:
- Conference: International congress on optical science and engineering, Hamburg (Germany), 13-23 Sep 1988; Other Information: PBD: 1990; Related Information: Is Part Of Large-area chromogenics: Materials and devices for transmittance control. Volume IS 4; Lampert, C.M. [ed.] [Lawrence Berkeley Lab., CA (United States)]; Granqvist, C.G. [ed.] [Chalmers Univ. of Technology and Univ. of Gothenburg, Gothenburg (Sweden)]; PB: 618 p.
- Country of Publication:
- United States
- Language:
- English
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