PHYSICAL CHEMISTRY
DIVISION
COMMISSION
ON COLLOID AND SURFACE CHEMISTRY
Manual of Symbol and Terminology for Physicochemical
Quantities and Units
Appendix
Definitions, Terminology
and Symbols in Colloid and Surface Chemistry
Part I
(Adopted
by the IUPAC Council at Washington, DC, USA, on 23 July 1971)
Prepared for publication by
D.H. Everett, Chairman, Commission on Colloid and Surface Chemistry
(1969-1972)
Preface: This Appendix to the Manual of Symbols and Terminology
for Physicochemical Quantities and Units (Butterworths: 1970 and Pure
and Applied Chemistry, 1970, 21, No. 1) has been prepared by the Commission
on Colloid and Surface Chemistry of the Division of Physical Chemistry
of the International Union of Pure and Applied Chemistry. It is the
outcome of extensive discussions within the Commission and its Sub-commissions,
with other IUPAC Commissions and with persons and organizations outside
IUPAC, over the period 1961-1971*. A tentative version of these proposals
was issued by IUPAC as Information Bulletin No. 3 (January 1970): the
text has been revised in the light of the criticisms, comments and suggestions
which were received, and the present version was formally adopted by
the IUPAC Council at its meeting in Washington, DC, in July 1971.
The present proposals are based on the general principles set out in
detail in Section I of the Manual of Symbols and Terminology. Since
colloid and surface chemistry are subdivisions of physical chemistry,
and there is substantial overlap between these fields and others, in
particular with electrochemistry and macromolecules, it is important
that terms in colloid and surface chemistry should not be used in a
sense different from that common to physical chemistry in general or
to its other subdivisions. On the other hand, it is equally important
to avoid inconsistencies between the meanings of terms employed in scientific
aspects of colloid and surface chemistry, and the same terms used in
industrial, engineering and technological contexts. It has also been
necessary to balance the desirability of retaining terms because of
historical connections or wide common usage against the need to develop
a more consistent and logical structure as colloid and surface chemistry
evolves into a more quantitative scientific discipline. It has not yet
been possible to resolve all the consequent problems. For this reason,
this Appendix will be issued in two parts.
Part II will include revised versions of the sections in the Tentative
Manual on optical properties and rheology. Furthermore, the section
on electrochemical nomenclature in Part I appears only in skeleton form,
pending the finalization by the Commission on Electrochemistry of their
nomenclature proposals. Proposals for nomenclature in the field of heterogeneous
catalysis are also in preparation and are planned for inclusion in Part
II.
This Appendix consists of three Sections: the first is concerned with
definitions and terminology, and with recommendations for appropriate
symbols; the second is a list of recommended symbols; and the third
an alphabetical index of terms defined, together with the corresponding
symbols.
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