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By Arno Seeboth, Detlef Lötzsch

Thermochromic fabrics according to reflection
Thermochromic fabrics in keeping with mild absorption
Thermochrmic and thermotropic fabrics in keeping with gentle scattering
Application of thermochromic and thermotropic materials
Active triggering and full of life characterization of thermotropic and of thermochromic materials
Concluding comments. All chapters through Dr. Arno Seeboth

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Thermochromic fabrics in accordance with reflection
Thermochromic fabrics in keeping with mild absorption
Thermochrmic and thermotropic fabrics in line with gentle scattering
Application of thermochromic and thermotropic materials
Active triggering and lively characterization of thermotropic and of thermochromic materials
Concluding comments. All chapters by means of Dr. Arno Seeboth and Dr. Detlef Lötzsch

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J. Indian Inst. Sci. 2009; 89(2):147–167. 36. , and Yin, Y. Responive photonische Kristalle. Angew. Chem. 2011; 123:1530–1561. 37. Weissman, J. , Sunkara, H. , Tse, A. , and Asher, S. A. Thermally switchable periodicities and diffraction from mesoscopically ordered materials. Science. 1996; 274:959–960. 38. Kanai, T. Lee, D. Shum, H. , and Weitz, D. A. Fabrication of tunable spherical colloidal crystals immobilized in soft hydrogels. Small. 2010; 6(7):807–810. References 39. Debord, J. , and Lyon, L.

Zinc oxide is an example of a thermochromic semiconductor. Due to the decrease in the band gap on heating the white zinc oxide becomes yellow. Chromium and mercury derivatives are two large groups of thermochromic inorganic solids which represent the other thermochromism-causing effects. Solids containing the trivalent chromium ion possess gradual color changes. The gemstone ruby is an example. Ruby is a regular a-alumina crystal (Al2O3) with a small content of Cr3+ ions which replace Al3+ ions.

Bistrifluoroacetylacetonatocopper(II) exhibits thermochromism at the melting point [12]. In the crystalline state the complex is slate-blue at all temperatures. At 189°C the slate-blue solid transforms into a deep green liquid. Two possible explanations were given for this effect: (i) occurrence of association in the molten state leading to a higher coordination number of each copper atom than in the solid state and (ii) change in the distribution of molecules between the vibrational levels of the ground state, which gives rise to a broadening of the absorption band.

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