Size selection and stability of thick-walled vesicles

Greenall, Martin J. (2018) Size selection and stability of thick-walled vesicles. Physics and Chemistry of Liquids, 56 (3). pp. 281-289. ISSN 0031-9104

Size selection and stability of thick-walled vesicles
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Item Type:Article
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In recent experiments, small, thick-walled vesicles with a preferred size were formed from copolymers where the degree of polymerisation of the hydrophobic block, N_B, was significantly greater than that of the hydrophilic block, N_A. We show that a simple mean-field theory can reproduce several aspects of the behaviour of these vesicles. Firstly, we find a minimum in the free energy of the system of vesicles as a function of their radius, corresponding to a preferred size for the vesicles, when N_B is several times larger than N_A. Furthermore, the vesicle radius diverges as N_B is increased towards a critical value, consistent with the instability of the vesicles with respect to further aggregation seen in the experimental work. Finally, we find that this instability can also be triggered in our model by changing the interaction strength of the copolymers with the solvent.

Keywords:Polymers, Self-assembly, Statistical mechanics
Subjects:F Physical Sciences > F340 Mathematical & Theoretical Physics
F Physical Sciences > F300 Physics
F Physical Sciences > F162 Polymer Chemistry
Divisions:College of Science > School of Mathematics and Physics
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ID Code:31165
Deposited On:27 Mar 2018 14:14

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