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Interfacial Tension of Phase-Separated Polydisperse Mixed Polymer Solutions
[Image: see text] Aqueous two-phase systems provide oil-free alternatives in the formulation of emulsions in food and other applications. Theoretical interpretation of measurements on such systems, however, is complicated by the high polydispersity of the polymers. Here, phase diagrams of demixing a...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical
Society
2017
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5890309/ https://www.ncbi.nlm.nih.gov/pubmed/29257868 http://dx.doi.org/10.1021/acs.jpcb.7b09967 |
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author | Vis, Mark Blokhuis, Edgar M. Erné, Ben H. Tromp, R. Hans Lekkerkerker, Henk N. W. |
author_facet | Vis, Mark Blokhuis, Edgar M. Erné, Ben H. Tromp, R. Hans Lekkerkerker, Henk N. W. |
author_sort | Vis, Mark |
collection | PubMed |
description | [Image: see text] Aqueous two-phase systems provide oil-free alternatives in the formulation of emulsions in food and other applications. Theoretical interpretation of measurements on such systems, however, is complicated by the high polydispersity of the polymers. Here, phase diagrams of demixing and interfacial tensions are determined for aqueous solutions of two large polymers present in a mass ratio of 1:1, dextran (70 kDa) and nongelling gelatin (100 kDa), with or without further addition of smaller dextran molecules (20 kDa). Both in experiments and in calculations from Scheutjens–Fleer self-consistent field lattice theory, we find that small polymers decrease the interfacial tension at equal tie-line length in the phase diagram. After identifying the partial contributions of all chemical components to the interfacial tension, we conclude that excess water at the interface is partially displaced by small polymer molecules. An interpretation in terms of the Gibbs adsorption equation provides an instructive way to describe effects of polydispersity on the interfacial tension of demixed polymer solutions. |
format | Online Article Text |
id | pubmed-5890309 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | American Chemical
Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-58903092018-04-10 Interfacial Tension of Phase-Separated Polydisperse Mixed Polymer Solutions Vis, Mark Blokhuis, Edgar M. Erné, Ben H. Tromp, R. Hans Lekkerkerker, Henk N. W. J Phys Chem B [Image: see text] Aqueous two-phase systems provide oil-free alternatives in the formulation of emulsions in food and other applications. Theoretical interpretation of measurements on such systems, however, is complicated by the high polydispersity of the polymers. Here, phase diagrams of demixing and interfacial tensions are determined for aqueous solutions of two large polymers present in a mass ratio of 1:1, dextran (70 kDa) and nongelling gelatin (100 kDa), with or without further addition of smaller dextran molecules (20 kDa). Both in experiments and in calculations from Scheutjens–Fleer self-consistent field lattice theory, we find that small polymers decrease the interfacial tension at equal tie-line length in the phase diagram. After identifying the partial contributions of all chemical components to the interfacial tension, we conclude that excess water at the interface is partially displaced by small polymer molecules. An interpretation in terms of the Gibbs adsorption equation provides an instructive way to describe effects of polydispersity on the interfacial tension of demixed polymer solutions. American Chemical Society 2017-12-19 2018-04-05 /pmc/articles/PMC5890309/ /pubmed/29257868 http://dx.doi.org/10.1021/acs.jpcb.7b09967 Text en Copyright © 2017 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Vis, Mark Blokhuis, Edgar M. Erné, Ben H. Tromp, R. Hans Lekkerkerker, Henk N. W. Interfacial Tension of Phase-Separated Polydisperse Mixed Polymer Solutions |
title | Interfacial Tension of Phase-Separated Polydisperse
Mixed Polymer Solutions |
title_full | Interfacial Tension of Phase-Separated Polydisperse
Mixed Polymer Solutions |
title_fullStr | Interfacial Tension of Phase-Separated Polydisperse
Mixed Polymer Solutions |
title_full_unstemmed | Interfacial Tension of Phase-Separated Polydisperse
Mixed Polymer Solutions |
title_short | Interfacial Tension of Phase-Separated Polydisperse
Mixed Polymer Solutions |
title_sort | interfacial tension of phase-separated polydisperse
mixed polymer solutions |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5890309/ https://www.ncbi.nlm.nih.gov/pubmed/29257868 http://dx.doi.org/10.1021/acs.jpcb.7b09967 |
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