Better Ceramics Through Chemistry IV. Materials Research Society Sumposium Proceedings

Better Ceramics Through Chemistry IV. Materials Research Society Sumposium Proceedings PDF

Author:

Publisher:

Published: 1991

Total Pages: 1099

ISBN-13:

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The intention of this symposium was to provide a forum for scientists and engineers from a diversity of backgrounds to discuss sol-gel, solution processing and other synthetic chemical techniques for engineering new or improved ceramics on a molecular level. Research into the area of reaction mechanisms and reaction kinetics of silicon species remained strong, while significant advances in the area of structure and properties of modified and unmodified metal alkoxide species were reported. The complementary area of processing in water based systems also received considerable attention with emphasis being placed on the hydrolysis behavior of ions in solution. The nature of particle/aggregate growth was also a major topic of discussion with papers being presented on the role of aggregation in particle growth and the nature and rheology of concentrated suspensions. Important developments in the area of mechanical properties of aerogels, fibers and films were presented as well as research into techniques for in situ monitoring of films during dip coating. Continued advances in the application of solution derived ceramics were also reported. These included GRIN lenses, planar waveguides, optical filters and optical switching, transpiration cooled windows, dye-polymer composites for nonlinear applications, dielectrics and electrooptics materials including PLZT's and the niobates, and chemical sensors, among others. Finally, one of the meeting highlights was a special evening session biomimetics: ceramic processing in natural systems.

Sol-Gel Science

Sol-Gel Science PDF

Author: C. Jeffrey Brinker

Publisher: Academic Press

Published: 2013-10-22

Total Pages: 925

ISBN-13: 0080571034

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Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing presents the physical and chemical principles of the sol-gel process. The book emphasizes the science behind sol-gel processing with a chapter devoted to applications. The first chapter introduces basic terminology, provides a brief historical sketch, and identifies some excellent texts for background reading. Chapters 2 and 3 discuss the mechanisms of hydrolysis and condensation for nonsilicate and silicate systems. Chapter 4 deals with stabilization and gelation of sols. Chapter 5 reviews theories of gelation and examines the predicted and observed changes in the properties of a sol in the vicinity of the gel point. Chapter 6 describes the changes in structure and properties that occur during aging of a gel in its pore liquor (or some other liquid). The discussion of drying is divided into two parts, with the theory concentrated in Chapter 7 and the phenomenology in Chapter 8. The structure of dried gels is explored in Chapter 9. Chapter 10 shows the possibility of using the gel as a substrate for chemical reactions or of modifying the bulk composition of the resulting ceramic by performing a surface reaction (such as nitridation) on the gel. Chapter 11 reviews the theory and practice of sintering, describing the mechanisms that govern densification of amorphous and crystalline materials, and showing the advantages of avoiding crystallization before sintering is complete. The properties of gel-derived and conventional ceramics are discussed in Chapter 12. The preparation of films is such an important aspect of sol-gel technology that the fundamentals of film formation are treated at length in Chapter 13. Films and other applications are briefly reviewed in Chapter 14. Materials scientists and researchers in the field of sol-gel processing will find the book invaluable.