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2 results on '"electrokinetic sonic amplitude method"'

1. STRUCTURE AND PROPERTIES OF POLYMER ADSORPTION LAYERS ON INORGANIC PIGMENTS IN AQUEOUS DISPERSION FORMED UNDER ULTRASONIC TREATMENT.

Author

Bulychev, N., Kisterev, E., Dirnberger, K., Zubov, V., and Eisenbach, C. D.

Subjects
POLYMERS, ADSORPTION (Chemistry), ULTRASONICS, FERROUS oxide, TITANIUM dioxide, ETHYLCELLULOSE
Abstract

The course and the result of the surface modification of titanium dioxide and ferrous oxide pigments in aqueous dispersion by ethylhydroxyethylcellulose (EHEC) without and with mechanical treatment of the dispersion by ultrasonic power was studied by the electrokinetic sonic amplitude (ESA) method. The evaluation of the ESA data showed that the ultrasonic treatment causes a significant thickness increase of the EHEC layer on the pigment which is primarily attributed to the ultrasonically induced activation of the pigment surface. The thickness of the polymer adsorption layer derived from ESA measurements was confirmed by TEM investigations. The ultrasonic treatment leads to significant changes of the properties of the adsorption layers and is a promising method for the surface modification of pigments with regard to dispersion stability. [ABSTRACT FROM AUTHOR]

Published
2019

2. Structure of adsorption layers of amphiphilic copolymers on inorganic or organic particle surfaces

Author

Bulychev, Nikolay, Dervaux, Bart, Dimberger, Klaus, Zubov, Vitali, Du Prez, Filip, and Eisenbach, Claus D

Subjects
Chemistry, polymer gel layer, electrokinetic sonic amplitude method, DILUTE SUSPENSION, DYNAMIC MOBILITY, dispersions, SOLID-LIQUID INTERFACE [KeyWords Plus], block and block-like copolymers [Author Keywords], POLYMER, surfaces, pigment surface modification
Abstract

The structure of adsorption layers of amphiphilic block and block-like copolymers of poly(isobornyl acrylate) and poly(acrylic acid) on the surface of hydrophilic titanium dioxide and hydrophobic copper phthalocyanine (CuPc) pigments in an aqueous studied by the electrokinetic sonic amplitude (ESA) method. The electroacoustic behaviour of the polyelectrolyte block copolymer-coated particles could be described in the context of the polymer gel layer theory. The polymer layer around the particles was found to be much thinner for CuPc as compared to the TiO2 substrate. This is attributed to differences in the adsorption mechanism and the composition of the adsorption layer normal to the substrate surface. Adsorption models were established that consider effects of the copolymer structure.

Published
2010

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