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Sol-Gel Glasses

  • Lisa C. KleinEmail author
Chapter
Part of the Springer Handbooks book series (SHB)

Abstract

Sol–gel processing is a nonmelting path to forming primarily silicate glasses. The most widely used precursors for the sol–gel process are metal alkoxides that undergo hydrolysis and condensation polymerization. Pure silica, binary compositions and multicomponent compositions are reacted to generate oxide polymers in the presence of water and alcohols. The oxide polymers grow and crosslink to produce a gel network at the sol–gel transition. After gelation, the solvents are removed, leaving behind a microporous skeleton that can be collapsed to a chemical and physical duplicate of a melted glass. The sol–gel process also refers to solution routes that involve soluble salts and colloidal routes that involve metastable suspensions of oxide nanoparticles. Combinations of alkoxides, salts and colloids are all considered sol–gel routes. The advantage of the sol–gel process, compared to melting and quenching, is that the process is carried out largely at room temperature. The low temperature makes the sol–gel process compatible with organic polymers, which enables formation of organic–inorganic hybrids. Also, when it is not necessary to remove the porosity, the sol–gel process is a means to form microporous and macroporous glasses.

Notes

Acknowledgements

Over the years, I have had the privilege of working with many excellent undergraduates, graduate students, postdoctoral fellows, research associates and colleagues at Rutgers University, and I thank them all. For specific figures that have not been published previously, I want to thank Varadh Ranganathan (Figs. 38.11 and 38.12), Max Freedman (Fig. 38.18) and Brooke McClarren and James Davanzo (Fig. 38.19). One impetus to put this information together was the course offered through the Lehigh University–Penn State University International Materials Institute for new functionality in glass (IMI-NFG) on glass processing in spring 2015. Currently, my research is supported by NSF Award 1313544 Materials World Network-SusChEM, in collaboration with M. Aparicio, Instituto de Ceramica y Vidrio Consejo Superior de Investigaciones Cientaficas (CSIC), Madrid, Spain and Andrei Jitianu, Lehman College-CUNY and The Graduate Center, The City University of New York.

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Dept. of Materials Science & EngineeringRutgers UniversityPiscataway, NJUSA

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