Issue 38, 2009
From the journal:

Journal of Materials Chemistry

Intense and selective coloration of foams stabilized with functionalized particles†

Sejong Kim,a   Harry Barrazab  and  Orlin D. Velev*a  

* Corresponding authors

a Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, USA
E-mail: odvelev@unity.ncsu.edu
Fax: +1 919 515 3465
Tel: +1 919 513 4318

b Unilever Research & Development, Bebington, Wirral, UK

Abstract

We report a new method for intense and selective coloring of foams stabilized by particles from cellulose derivatives. The addition of pH-sensitive dyes during the process of formation of hydrophobically modified cellulose (HMC) particles by a pH-jump leads to co-precipitation and strong adsorption of the pH-sensitive dyes on the cellulose particle surfaces at low pH. These strongly colored HMC particles not only act as strong stabilizers of the foams, but also allow their intense and selective coloration without any coloring of the solution medium. We characterized quantitatively the color intensity of these foams, analyzed the adsorption behavior of pH-sensitive dyes on the cellulose particles and showed that it follows well the Langmuir isotherm model. Lower pH of the media leads to stronger adsorption of the pH-sensitive dyes on the HMC particles due to the hydrophobic attraction under reduced electrostatic repulsion. The results illustrate how particle stabilizers can be used to impart additional functionality to foams and prepare dispersion systems of unusual properties.

Graphical abstract: Intense and selective coloration of foams stabilized with functionalized particles

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Article information

DOI
https://doi.org/10.1039/B908054F
Article type
Paper
Submitted
22 Apr 2009
Accepted
08 Jul 2009
First published
20 Aug 2009

J. Mater. Chem., 2009,19, 7043-7049

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Intense and selective coloration of foams stabilized with functionalized particles

S. Kim, H. Barraza and O. D. Velev, J. Mater. Chem., 2009, 19, 7043 DOI: 10.1039/B908054F

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