Emulsifying properties of neutral and ionic polymersurfactants based on dextran

文献情報

出版日 2004-01-20

DOI 10.1039/B314454M

インパクトファクター 3.676

著者

E. Rotureau, M. Leonard, E. Dellacherie, A. Durand

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要旨

The emulsifying properties of neutral and anionic polymer surfactants derived from dextran (a neutral polysaccharide) are described. The kinetics of interfacial tension lowering by the amphiphilic polymers is first characterized by the use of semi-empirical equations. These equations allow the determination of the equilibrium value of surface tension by extrapolation to infinite time. Oil-in-water emulsions are prepared by sonication in the presence of the polymers previously dissolved in the aqueous phase. The average droplet size of the emulsions is determined immediately after preparation and followed during several weeks. Ageing of the emulsions is shown to result from molecular diffusion in accordance with previous work. The increase of droplet size with time is correctly depicted by the theoretical equation derived by Lifshitz, Slyozov and Wagner (LSW). It seems that creaming has no real effect on emulsion ageing up to 1 μm. The influence of oil nature is clearly related to the physical properties of the oil (solubility in water, diffusion coefficient, interfacial tension), a typical consequence of molecular diffusion. An increase in the amount of hydrophobic groups fixed on the polymer leads to slower ageing. An increase in the anionic group content of the polymer has the reverse effect. Ionic strength has a significant effect on ageing of emulsions stabilized by dextran derivatives bearing ionic groups. Increasing ionic strength in the continuous phase gives rise to slower emulsion ageing. An attempt is made to rationalise all these facts by relating emulsion ageing to the data of interfacial tension measurements. The results follow approximately the tendency predicted by the LSW equation.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

Emulsifying properties of neutral and ionic polymersurfactants based on dextran

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Physical Chemistry Chemical Physics

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