Download PDF by Alain C. Pierre (auth.): Introduction to Sol-Gel Processing

By Alain C. Pierre (auth.)

ISBN-10: 0792381211

ISBN-13: 9780792381211

ISBN-10: 1461556597

ISBN-13: 9781461556596

TO SOL-GEL PROCESSING by means of Alain c. Pierre Universite Claude-Bemard-Lyon 1 ~. SPRINGER SCIENCE+BUSINESS MEDIA, LLC " ISBN 978-0-7923-8121-1 ISBN 978-1-4615-5659-6 (eBook) DOl 10. 1007/978-1-4615-5659-6 Library of Congress Cataloging-in-Publication information A C. I. P. Catalogue list for this booklet is out there from the Library of Congress. Copyright© 1998 through Springer Science+Business Media big apple initially released via Kluwer educational Publishers in 1998 Softcover reprint of the hardcover 1st version 1998 moment Printing 2002. All rights reserved. No a part of this ebook should be reproduced, kept in a retrieval approach or transmitted in any shape or in any way, mechanical, photograph­ copying, recording, or another way, with out the past written permission of the writer, Springer technological know-how+ enterprise Media, LLC published on acid-free paper. This printing is a electronic duplication of the unique variation. To Marie-Claude David and Valerie Kaolinite gel community. From ok. Ma and A. Pierre - Unpublished photo. desk OF content material PREFACE ix 1 . basic creation 1 l. l - brief historical past 1 1. 2 - Sols, gels and gelation 2 1. three - define of sol-gel processing four 1. four - fresh advancements 6 1. five - merits and barriers of sol-gel processing 6 1. 6 - association of the e-book eight 1. 7 - References eight 2 ·THE CHEMISTRY OF PRECURSORS ideas eleven 2. 1 - creation eleven 2. 2 - Solvents 12 2. three - foundation of precursors differences in resolution 17 2. four - steel salts strategies 24 2.

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Bi2+), since they undergo extensive hydrolysis, A has a higher value. 4-3 - Relation between log Kl\ and the ratio charge to M-O distance, ~ for various cations. After Baes and Mesmer [13]. Introduction to Sol-Gel Processing CONDENSATION POLYMERIZATION OF CATIONS IN 31 SOLUTION. Two mononuclear complexes of M. each comprising only one metal atom M. can react with one another in a polymerization reaction in order to form a polynuclear complex consisting of two metal atoms. Such a reaction. also called condensation.

After McMurry [11] .. 3-3 - Binding of a chelating ligand with a metal complex. An example of a bidentate chelating ligand: the acetylacetonato ion. After Shriver et aI. [12]. 3-2 - Typical chelating ligands (2: bidentate, 3: tridentate, 4: tetradentate, 6: hexadentate). The coordinating atoms are in parenthesis. Adapted from Shriver and al. [12]. Name Formula Acetylacetonato 2,2-Bipyridine [CH 3COCHCOCH31' ococ Chelating type 2(0) ~O bipy 2(N) NH(C 2H4NH 2 H2 NCH 2CH2NH2 CH3COCH 2COCH 2CH3 - ~~ r-'\.

4-20), an H+ cation attacks the oxygen atom of an hydroxo ligand belonging to the metal complex. 33 Introduction to Sol-Gel Processing H " &- 5+ 5- -----. 4-19) / H 'H " H ~OM_O_M / L-,,----I + 2H 20 + HO "oxo" bridge Hence, the newly fonned corresponding H20 ligand gains a positive partial charge, 5+, and moves toward another OH ligand. thus fonning an intennediate complex. The H30+ ion then leaves while the complex is now fonned of an "oxo" bridge. 4-21) is also possible when the coordination number of a metal can be increased as in [V04 P-.

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