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Book Review Porous Carbon Solids. Edited by R. L. Bond

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articles are clearly arranged, make for easy reading, and are
readily comprehensible. Chapter 6 describes the properties
of halogen ions as ligands; chapter 8 deals with solvent
properties of oxychlorides on the basis of a “solvent
definition of acids and bases” and of a “coordination model
of nonaqueous solutions”. Chapter 7 provides a review of the
application of salt melts in the preparation of fluorinecarbon compounds. The formation of complex ions in the
melt is also discussed and examples of the manufacture of
metals are given.
Volume 3 likewise contains eight chapters, the first three
being devoted mainly to theoretical aspects of halogen chemistry. The others deal with the preparation and properties of
metal-halogen compounds. 1. Halides containing Multicentered Metal-Metal Bonds ( D . L. Kepert and K . Vrieze);
2. The Nature of the Metal-Halogen Bonds ( R . G. Pearson
and R . J . Mawby); 3. Review of Metal-Halogen Vibrational
Frequencies ( R . J . H. Clark); 4 . The Halides of Niobium and
Tantalum (F. Fairbrother); 5. Pentahalides of the Transition
Metals (A. D . Beveridge and H. C. Clnrk); 6. Halide Chemistry of Chromium, Molybdenum, and Tungsten (J. E.
Fergrrsson); 7. Halogen Chemistry of the Actinides ( K . W.
BagnaN); and 8. Halogeno-Metal Carbonyls and Related
Compounds (F. Calderazzo).
Apart from the somewhat arbitrary choice of subject matter
and a certain amount of duplication in the individual articles,
these two volumes certainly represent a welcome addition
for the chemist interested in these topics. With their help he
can rapidly gain a comprehensive picture of the latest
results in halogen research. Furthermore, since the volumes
also contain various stimuli for further work they should on
n o account be absent from any chemical library.
A . H m s [NB 740 IE]
Porous Carbon Solids. Edited by R . L. Bond. Academic Press
London-New r o r k 1967, 1st Edit., xi, 311 pp.. numerous
illustrations and tables, bound $ 14.50 / 80 s.
This book deals with the possible methods for determining
the pore structure of solids. The title is misleading insofar as
nearly all the methods are generally applicable. Only in the
results quoted as examples d o synthetic graphites, activated
carbons, and natural coals receive special treatment.
The theoretical and experimental aspects of the methods are
described in eight sections in which, however, some procedures are treated too briefly. This is particularly true of the
description of the evaluation of the gas adsorption isotherm
which is the most important procedure in the determination
of pores having a radius of less than 100 A. Better and more
detailed information on this subject can be found elsewhere.
The recently developed t-plot method of de Boer and Lippens
is not mentioned at all. The next section describes the possible methods of determining the pore size distribution by adsorption of molecules of various sizes from solutions and also
by the use of gaseous molecular ‘probes’ which give a good
measure of the molecular sieve properties of coals and narrow
pore carbons. Density measurements by displacement of
helium or liquids are also described. The characterization of
pore structure by permeability measurements of gases and
liquids is described very thoroughly and critically; the limits
of validity of the theoretical assumptions are particularly
discussed. The same is true of mercury porosimetry, the
standard method for the determination of pore sizes with
radii between 10 EL and 100 A. The last chapters describe
direct representation of relatively large pores, using radiographic methods. In this, the pores are filled with a liquid
that absorbs X-rays more strongly than carbon, for instance
liquid bismuth o r silver
This book certainly enriches the Iiterature, particularly in the
treatment of the less well-known procedures. The reviewer
especially liked t h e criticism of the various methods. The
standard procedures are, however, described more clearly and
H. p , ~~~h~ [NB 754 IE]
thoroughly in other works.
Angew. Chem. internat. Edit. 1 Vol. 7 (1968) 1 No. I2
The Solid-Gas Interface. Vol. 2. Edited by F. A. Flood. Marcel
Dekker Inc., New York 1967. 1st Edit., xiii, 660 pp.,
numerous illustrations, $ 27.50.
Shortly after the appearance of the first volume“], which
dealt essentially with the foundations and theory of physical
adsorption, a second volume has now appeared. Acknowledged experts report o n modern methods of measurement
and their application to the problem of physical adsorption.
R. L. Mclntosh deals with dielectric measurements on adsorption systems and discusses the results obtained. P . W.
Selwood discusses the application of the investigation of
magnetic properties of suitable systems for the study of adsorbent-adsorbate interactions and adsorption bonding.
In an extensive article R . M . Barrer treats the problems of
material transport in porous media and in adsorption phases.
H . W. Hubgood deals with the theoretical foundations of gas
chromatography and shows how this method can be applied
to investigations on adsorption, in particular to the determination of adsorption isotherms and heats of adsorption.
S . Ross and E . D. Tolles deal with the sorption of gases by
solids covered with liquids. Finally, W. P r i m discusses the
take-up of adsorbate by the adsorbent and the resulting
volume changes of the adsorbent.
The thermodynamic and kinetic aspects important in the
study of adsorption are discussed by B. E. Conway. P . J .
Sereda and R . F. Feldiimn show how the mechanical properties of the adsorbent are influenced by the presence of an
adsorbate.
Measurements o f surface potentials provide valuable information on bonding of the adsorbate. F. C. Toinpkins deals with
the most important methods of determination, discusses the
results obtained in several systems, and comments o n the
conclusions to be drawn. By means of a band model A . C.
Zettleinoyer and R . D. Iyengar discuss the interaction between adsorbates and semi-conductor surfaces.
The relationships during the impingment of a molecule on
the surface of a solid and particularly its accommodation, is dealt with in two articles: F. M . Devienne deals
mainly with the experimental results, and E. A. Flood and
J . P. Hobson discuss the possibilities of a theoretical treatment of the problem.
J. N . Kodgons reports on the optical properties of the solidgas interface; C. H . Aniberg explains the methods and applications of IR spectroscopy.
The measurements of electron spin resonance and nuclear
magnetic resonance, first applied to the study of adsorption
o n l y a few years ago, are described by J. G . Asfon, and M . J .
D. Low describes the application of the Mossbauer effect.
E. D. Eanes and A. S. Posner put forward small-angle X-ray
scattering as a valuable method of studying the adsorbing
surfaces.
J. R. Dacey describes the adsorptive properties of activated
carbon in comparison with other adsorbents. B. G. Linsen
and A. van den Heirvel draw the reader’s attention to the
significance of pore structure in adsorption. The problem of
hysteresis in the field of adsorption is discussed by D . H .
Everett.
As in the first volume, G. D. Halsey ends by reviewing
critically each chapter of the book.
This two-volume work is not a textbook on physical adsorption - the structure is too heterogeneous and the chapters are
too little attuned to one another for this purpose. The book
is rather directed to those already occupied with problems of
adsorption, acquainting them with the most recent theoretical
and experimental developments. The 1050 references in the
first volume and those numbering over 2000, in the second
volume include work from 1966. It should be particularly
emphasized that not only are the commonly used methods
dealt with, but also the more special procedures, often with
G. Wedler [NB 751 IE]
very illuminating results.
[I] Cf. Angew. Chem. 80, 325 (1968); Angew. Chem. internat.
Edit. 7, 319 (1968).
963
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