Hartmut A. Wege
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.
Professor Vesselin Paunov V.N.Paunov@hull.ac.uk
Professor of Physical Chemistry and Advanced Materials
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.
|Journal Article Type||Article|
|Publication Date||Sep 2, 2008|
|Publisher||American Chemical Society|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||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. https://doi.org/10.1021/la801634j|
|Keywords||Hydrophobic cellulose; Microparticles; Emulsifier; Foaming agent|
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