By Larry L. Hench

ISBN-10: 0815514190

ISBN-13: 9780815514190

Content material:
Preface

, Pages vii-viii
1 - The Concept

, Pages 1-7
2 - Sol-Gel Kinetics

, Pages 8-23
3 - Aging

, Pages 24-32
4 - Drying

, Pages 33-42
5 - Stabilization

, Pages 43-62
6 - Densification

, Pages 63-69
7 - Laser Densification

, Pages 70-79
8 - Gel-Silica Optics

, Pages 80-96
9 - Porous Gel-Silica Optical Matrices

, Pages 97-116
10 - organic Implications

, Pages 117-132
11 - expertise move of Gel-Silica Optics

, Pages 133-150
Acknowledgment

, Page 151
References

, Pages 152-163
Index

, Pages 164-168

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Additional info for Sol-Gel Silica. Properties, Processing and Technology Transfer

Sample text

851 The important absorption peaks and bands found in Wang' s dehydration study [78] of gel-silica are summarized in Table 5-1. [37][85][91] 48 Sol-Gel Silica T a b l e 5-1. 22 4V3 Small peak ct*VOH: An out of plane bending vibration of Si-O-H bond. **vi: Stretching vibration of an isolated Si-O-H bond. ***v2: Stretching vibration of an adjacent Si-O bond. ****v3: Stretching vibration of a Si-O-H bond which is hydrogen bonded to water. *****v4: Stretching vibration of adsorbed water. Curves a - d in Fig.

I~;:~l~ -" ' ...... is:i::i2~ - - Y ' , 9 i , i; ................ )? iiiii '-125 m ~em-per~t,- "~ 9 • r~ O 7s "- ~ - 50 ,ww t~ / . - 100 -~ " 75 . X . ; o 175 Time (hours) Figure 4-4. Time dependence of (a) temperature and weight; (b) absolute loss rate; (c) loss rate per unit average for gel A. 38 Sol-Gel Silica Pore (-'8 nm diameter) Bound water layer X--. -- w. 3nm _. Dtu. y Section I I I I. 6,3nn . ; " ....... ~ I_ 1 I $ ,I 10 I IS I 20 I 25 Y Section I 30 Scale nanometers Figure 4-5. Schematic representation of gel surface at the beginning of stage 1.

37][85][91] 48 Sol-Gel Silica T a b l e 5-1. 22 4V3 Small peak ct*VOH: An out of plane bending vibration of Si-O-H bond. **vi: Stretching vibration of an isolated Si-O-H bond. ***v2: Stretching vibration of an adjacent Si-O bond. ****v3: Stretching vibration of a Si-O-H bond which is hydrogen bonded to water. *****v4: Stretching vibration of adsorbed water. Curves a - d in Fig. 51 nm. A very strong, broad absorption band occurs between 2400 nm and 3200 nm. None of these peaks have been eliminated by heating, instead they have only decreased in intensity with increasing Stabilization 49 temperatures.

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Sol-Gel Silica. Properties, Processing and Technology Transfer by Larry L. Hench


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