close

Вход

Забыли?

вход по аккаунту

?

Book Review Inorganic Polymeric Glassses. (Series Studies in Inorganic Chemistry Vol. 15.) By R. C

код для вставкиСкачать
Like Cages” together serve to bridge the gap between inorganic chemistry and biochemistry.
One of the book’s weaknesses is undoubtedly that the
potential of N M R spectroscopy only emerges in Chapter 14,
and no mention is made of the great importance of 3Cd‘HN M R spectroscopy in elucidating the three-dimensional
structures of metallothioneins. In recent years N M R spectroscopy has become such a powerful method in this area
that even the interpretation of X-ray crystallographic data
has had to rely on N M R results. The neglect of N M R spectroscopy is probably due to the fact that the book has developed out of papers presented at the symposium on “The
Chemistry of Heavy Metals in Physiologically Important
Roles” (Hawaii, 1989).
Altogether, this book is of interest to those involved in all
aspects of metallothionein research, as it is clearly presented
and contains nearly 1000 literature references which afford
easy access to the original publications. It should therefore
be available in every departmental library.
Hans-Oscar Stephaii
Fachbereich Anorganische und Festkorperchemie
der Universitat Duisburg (FRG)
Inorganic Polymeric Glassses. (Series: Studies in Inorganic
Chemistry, Vol. 15.) By R . C. Popp. Elsevier, Amsterdam,
1992. XIV, 322 pp., hardcover HFI 365.00.-ISBN 0-44489500-0
This book contains a useful survey of experimental results
on glass-forming phosphate systems, explaining clearly how
these relate to applications. Special attention is devoted to
the suitability of these materials for immobilizing and sealing
in radioactive wastes in the nuclear energy industry.
The introductory chapter deals with the fundamentals of
glass formation, the important properties that can be controlled by adjusting the process variables, and the main technological methods used in glass manufacture, including a
brief survey of aspects such as sol-gel technology and fiber
optics processes. However, the emphasis on phosphate glass-
es as inorganic polymeric glasses, thereby making a distinction between these and glasses made from other glass-forming systems, seems rather arbitrary, and can hardly be justified on structural grounds.
The main part of the book is concerned with efforts to
produce glasses with the highest possible chemical stability,
and with the analytical and diagnostic methods used to evaluate them. Much space is devoted to the resistance to hydrolysis and acids, and the effects of impurities (especially contamination from the crucible wall during melting) on the
properties, including the recrystallization and segregation
behavior, illustrated throughout by electron micrographs.
However, in the course of this the author makes some statements that are unsupported by experimental evidence and d o
not take into account other results reported in the literature.
Thus, he denies the existence of a specific mechanism for
internal diffusion in glasses of this type, whereas it is known,
for example, that Na@ions have a higher mobility in NaPO,
glasses than they d o at comparable concentrations in silicate
or borate glasses. As the book describes, glass-forming phosphate systems are used not only for encapsulating radioactive wastes but also in luminescent glasses, and the range
of uses is being further extended to medical applications
based on their proven biocompatibility ; for example, glasses
of this type or suitable glass ceramics can be used as bone
cements o r in dental prosthetics.
Each chapter ends with a bibliography listing important
original papers and, most usefully, review articles. This is a
monograph on a specialized field, in which a notable feature
is the thorough survey of knowledge on the inorganic structural chemistry of condensed phosphates.
The excellent layout makes the text quick and easy to
assimilate. The book will certainly be welcomed and used by
specialists in the field of phosphate-containing materials. It
has been produced using a computer text-processing program, and this becomes apparent especially in the diagrams,
which d o not always have the necessary captions. In view of
this, the rather high price seems surprising.
Adalberf Feltz
Institut fur Anorganische Chemie
der Universitat Jena (FRG)
New Books
see next page
Angeic. C ’ l ~ e r n Int.
.
Ed. Engl. 1993, 32, No. 9
(:> VCH VerlugsgesrNscl7ufi mbH, 0-69451 Weinheim, 1993
0570-0R33/93/0909-1375 S 10.00+ .25/0
1375
Документ
Категория
Без категории
Просмотров
1
Размер файла
107 Кб
Теги
chemistry, inorganic, book, series, glassses, polymeric, vol, review, studies
1/--страниц
Пожаловаться на содержимое документа