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Adsorption and surface characteristics of some pigments

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Abstract

The study of the heterogeneous nature of pigment surfaces was carried out by means of the adsorption of polar organic molecules from organic solvents onto the surface of a number of industrial pigments and extenders, including titanium dioxide, talc, barium sulphate, lead chromate, etc. An adsorption pattern was observed which suggested the existence of “Selective Polar Adsorption”, this being quite distinctive from purely physical (capillary condensation type) adsorption and chemisorption.

Apparently the surfaces of pigments and extenders consist of a number of distinctive “active” areas, each particular area adsorbing selectively a specific type of polar group. Every pigment can be characterized by the size, number and type of these individual areas, which give a “fingerprint” of the pigment and which apparently depends more on the origin of the pigment than on its chemical structure.

Zusammenfassung

Das Studium der heterogenen Natur von PigmentOberflächen wurde durch Adsorption von polaren organischen Molekülen, von organischen Lösungsmitteln an die Oberfläche einer Anzahl industrieller Pigmente und Streckungsmittel, zum Beispiel Titandioxyd, Talk, Bariumsulfat, Bleichromat usw., durchgeführt.

Es konnte ein Adsorptionsschema beobachtet werden, das die Existenz von selektiver polarer adsorption andeutet. Dieses Phänomen ist durchaus verschieden von reiner physikalischer Adsorption (Kapillar-Kondensation) und Chemiesorption.

Wahrscheinlich besteht die Oberfläche von Pigmenten und Streckungsmitteln aus einer Anzahl von bestimmten aktiven Gebieten. Jedes dieser einzelnen Gebiete adsorbiert selektiv eine spezifische Type von polaren Gruppen.

Ein jedes Pigment kann durch die GrösBe, Anzahl und den Typus dieser individuellen Gebiete charakterisiert werden, welche ein ganz bestimmtes Merkmal des betreffenden Pigments sind und wahrscheinlich mehr von der Herkunft des Pigments als von der chemischen Struktur abhängen.

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The paper is based on the experimental data obtained by the writer in years 1951–53 in Research Laboratories of B.A.L.M. Paints Pty. Ltd.

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Dintenfass, L. Adsorption and surface characteristics of some pigments. Kolloid-Zeitschrift 155, 121–131 (1957). https://doi.org/10.1007/BF01502340

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