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Electromobility of Mica Particles Dispersed in Aqueous Solutions

Published online by Cambridge University Press:  02 April 2024

R. M. Pashley
R. M. Pashley*
Affiliation:
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
*
1On leave from Department of Applied Mathematics, Research School of Physical Sciences, Australian National University, Canberra, ACT 2601, Australia.
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Abstract

Mobility measurements were made for dry-ground mica particles dispersed in aqueous KCl, Cr(NO3)3, and cetyltrimethylammonium bromide (CTAB) solutions. In the latter solutions charge reversal occurred at about 2 × 10-6 M and 3 × 10-5 M, respectively. Negative zeta potentials in KCl solutions calculated using the Smoluchowski equation are about one third of the corresponding values obtained from streaming potentials and force measurements using mica sheets. Good agreement, however, was obtained when positively charged groups created during grinding were neutralized, and the zeta potentials were corrected according to the procedure of O'Brien and White with an assumed average particle size of 0.25 μm. When the zeta potentials of positively charged particles were corrected in this way, agreement with values calculated from force measurements was also improved.

Резюме

Резюме

Измерения мобильности были сделаны на сухо-растертых частицах слюды, диспергированных в водных растворах KCl, Cr(NO3)3 и цетилтриметиламмиачного бромида (ЦТАБ). В последних растворах реверсирование заряда происходило при концентрациях 2 × 10-6 M и 3 × 10-5 М, соответственно. Отрицательные зета потенциалы в растворе KCl, вычисленные по уравнению Смолуговского, равны примерно одной трети соответствующих величин, полученных из текущих потенциалов и силовых измерений, используя пластинки слюды. Хорошее соответствие, однако, получалось, когда положительно заряженные группы, образованные в течение растирания, нейтрализовались, а потенциалы зета корректировались соответственно при помощи процедуры О’Браяна и Уайта, предполагая средний размер частиц равен 0,25 μm. После коррекции потенциалов зета положительно заряженных частиц при помощи этого метода, также улучшилось согласие с величинами, полученными по измерениям силы. [E.G.]

Resümee

Resümee

Mobilitätsmessungen wurden an trocken gemahlenen Glimmerpartikeln durchgeführt, die in wässrigen KCl-, Cr(NO3)3-, und Cetyltrimethylammoniumbromid-Lösungen (C.TAB) dispergiert waren. In den letzteren Lösungen trat bei etwa 2 ×10−6 m bzw. 3 × 10−5 m, Ladungsumkehr auf. Negative Zeta-Potentiale in den KCl-Lösungen, die mit der Smoluchowski-Gleichung berechnet wurden, betragen etwa der entsprechenden Werte, die aus den Strömungspotentialen und Kraftmessungen unter Verwendung von Glimmerblättchen erhalten wurden. Eine gute Übereinstimmung wurde jedoch erreicht, wenn man positiv geladene Gruppen, die während des Mahlens entstanden sind, neutralisierte, und die Zetapotentiale nach der Methode von O'Brien und White korrigierte unter der Annahme, daß die durchschnittliche Partikelgröße 0,25 μm beträgt. Wenn die Potentiale der positiv geladenen Teilchen auf diese Art korrigiert wurden, dann wurde auch die Übereinstimmung mit den aus den Kraftmessungen berechneten Werten verbessert. [U.W.]

Résumé

Résumé

On a mesuré la mobilité de particules de mica moulues-sèches dispersées dans du KCl aqueux et dans des solutions de Cr(NO3)3, et de bromide cétyltriméthylammonium (C.TAB). Dans ces dernières solutions, le renversement de charge s'est produit à à peu près 2 × 10−6 M, respectivement. Les potentiels zéta négatifs dans des solutions KO calculés en employant l’équation Smoluchowski sont approximativement un tiers des valeurs correspondantes obtenues de potentiels coulants et de mesures de force utilisant des feuilles de mica. On a cependant obtenu un bon accord lorsque des groupes chargés positivement crées lors du broyage ont été neutralisés et les potentiels zéta ont été corrigés selon le procédé d'O Brien et White avec une taille de particule moyenne de 0,25 μm. Lorsque les potentiels zéta de particules chargées étaient corrigés de cette manière, l'accord avec des valeurs calculées à partir de mesures de force a été amélioré. [D.J.]

Keywords

ElectromobilityForce measurementsMicaSmoluchowski equationStreaming potential
Type
Research Article
Information
Clays and Clay Minerals , Volume 33 , Issue 3 , June 1985 , pp. 193 - 199
Copyright
Copyright © 1985, The Clay Minerals Society

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