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Long-term stabilization of foams and emulsions with in-situ formed microparticles from hydrophobic cellulose

Wege, Hartmut A.; Kim, Sejong; Paunov, Vesselin N.; Zhong, Qixin; Velev, Orlin D.


Hartmut A. Wege

Sejong Kim

Vesselin N. Paunov

Qixin Zhong

Orlin D. Velev


We report a simple method to produce foams and emulsions of extraordinary stability by using hydrophobic cellulose microparticles, which are formed in situ by a liquid-liquid dispersion technique. The hydrophobic cellulose derivative, hypromellose phthalate (HP), was initially dissolved in water-miscible solvents such as acetone and ethanol/ water mixtures. As these HP stock solutions were sheared in aqueous media, micron sized cellulose particles formed by the solvent attrition. We also designed and investigated an effective and simple process for making HP particles without any organic solvents. where both the solvent and antisolvent were aqueous buffer solutions at different pH. Consequently, the HP particles adsorbed onto the water/air or water/oil interfaces created during shear blending, resulting in highly stable foams or foam/emulsions. The formation of HP particles and their ability for short-term and long-term stabilization of interfaces strongly depended on the HP concentration in stock solutions, as well as the solvent chemistry of both stock solutions and continuous phase media. Some foams and emulsion samples formed in the presence of ca. 1 wt% HP were stable for months. This new class of nontoxic inexpensive cellulose-based particle stabilizers has the potential to substitute conventional synthetic surfactants, especially in edible, pharmaceutical and biodegradable products.


Wege, H. A., Kim, S., Paunov, V. N., Zhong, Q., & Velev, O. D. (2008). Long-term stabilization of foams and emulsions with in-situ formed microparticles from hydrophobic cellulose. Langmuir : the ACS journal of surfaces and colloids, 24(17), 9245-9253.

Journal Article Type Article
Online Publication Date Jul 23, 2008
Publication Date Sep 2, 2008
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 24
Issue 17
Pages 9245-9253
Keywords Hydrophobic cellulose; Microparticles; Emulsifier; Foaming agent
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