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Interfacial activity and emulsion stabilization of dissolved cellulose
Mid Sweden University, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
Mid Sweden University, Sweden.
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2019 (English)In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 292, article id 111325Article in journal (Refereed) Published
Abstract [en]

Some aspects of the interfacial behavior of cellulose dissolved in an aqueous solvent were investigated. Cellulose was found to significantly decrease the interfacial tension (IFT) between paraffin oil and 85 wt% phosphoric acid aqueous solutions. This decrease was similar in magnitude to that displayed by non-ionic cellulose derivatives. Cellulose's interfacial activity indicated a significant amphiphilic character and that the interfacial activity of cellulose derivatives is not only related to the derivatization but inherent in the cellulose backbone. This finding suggests that cellulose would have the ability of stabilizing dispersions, like oil-in-water emulsions in a similar way as a large number of cellulose derivatives. In its molecularly dissolved state, cellulose proved to be able to stabilize emulsions of paraffin in the polar solvent on a short-term. However, long-term stability against drop-coalescence was possible to achieve by a slight change in the amphiphilicity of cellulose, effected by a slight increase in pH. These emulsions exhibited excellent stability against coalescence/oiling-off over a period of one year. Ageing of the cellulose solution before emulsification (resulting in molecular weight reduction) was found to favour the creation of smaller droplets.

Place, publisher, year, edition, pages
Elsevier B.V. , 2019. Vol. 292, article id 111325
Keywords [en]
Adsorption, Amphiphilicity, Cellulose molecules, Emulsions, Interfacial activity, Oil-water interface, Cellulose derivatives, Coalescence, Dissolution, Emulsification, Ostwald ripening, Paraffin oils, Paraffins, Emulsion stabilization, Interfacial behaviors, Molecular weight reductions, Oil water interfaces, Oil-in-water emulsions, Cellulose, Agglomeration, Dissolving
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39648DOI: 10.1016/j.molliq.2019.111325Scopus ID: 2-s2.0-85069688256OAI: oai:DiVA.org:ri-39648DiVA, id: diva2:1341048
Note

Funding details: Vetenskapsrådet, VR, 2015-04290; Funding text 1: The Swedish Research Council (Vetenskapsrådet), in Sweden, is acknowledged for support through the research grant no. 2015-04290 . The Research Institute of Sweden (RISE), division of Bioscience and Materials, is gratefully acknowledged for the use of their facilities and educational support. This research has been supported by Treesearch.se.

Available from: 2019-08-07 Created: 2019-08-07 Last updated: 2019-08-07Bibliographically approved

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