Dynamic Light Filters: Smart Materials Applied to Textile Design
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his book focuses on the crystal growth of II–VI compound semiconductors by the vapor-transport method in sealed quartz ampules. Although confined to just a few II–VI compounds related to ZnSe, its topics are general and applicable to many crystal-growth processes. The book is divided into eight self-contained chapters that can be read independently. Chapter 1 introduces and explains the properties of the compounds discussed, including ZnSe, ZnS, ZnTe, CdS, and CdTe. Their applications include lightemitting diodes and laser diodes in the blue and ultraviolet spectral regions. The advantages of vapor crystal growth are discussed, including its ability to produce crystals at temperatures below the compound’s melting point, with controlled stoichiometry, and with high purity. This crystal-growth process consists of the creation of vapor at the source material
(sublimation), transport of species to the crystal-growth zone, and their condensation to form the crystal (chapters 2 and 3). Sublimation is controlled by the vapor pressures of the individual elements in the compound. The thermodynamics governing the partial pressures as functions of temperature are described. The transport of elements is driven by diffusion because of concentration gradients and convection due to differences in temperatures along the tube length. The practical steps to implementing this crystal-growth method include treating the silica tube to minimize the release of oxygen and water vapor, considering the advantages and disadvantages of horizontal and vertical configurations, and setting up an appropriate temperature profile (chapter 4). Techniques to evaluate the crystals are considered in chapter 5. The crystals are optically examined to determine their size, shape, and morphology.
Dynamic Light Filters: Smart Materials Applied to Textile Design Isabel Dias Cabral, António Pedro Souto, and Linda Worbin Springer, 2020 219 pages, $149.99 ISBN 978-3-030-39528-5
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he book is a modern and challenging approach to smart textile materials and their design specifically applied in dynamic light filters. Even though such materials are typically associated with passive functionalities, now the emphasis is on the dynamic dimensions that appear in time and movement during the interaction of light with matter under the action of thermal and electrical fields.
The work is structured into three parts and seven chapters, and is finalized with conclusions and reference lists. In Part I, basic concepts in dynamic color in textiles are presented, for a deeper understanding of thermochromic mechanisms in connection with light transmittance and electrical activation of thermo-responsive textiles. These theoretical notions are strongly supported in Part II by a large
Crystal surface kinetics can be applied to explain the detailed surface structure. Methods of characterizing the crystalline structure, extended defects, compound stoichiometry, and concentrations of impurities in the crystals are explained in chapter 6. Measuring the crystal’s charge-transport p
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