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Molecular Weight Dependence of Polymersome Membrane Elasticity and Stability | | Harry Bermudez
; Aaron K. Brannan
; Daniel A. Hammer
; Frank S. Bates
; Dennis E. Discher
; | | Date: |
4 Oct 2001 | | Subject: | Soft Condensed Matter; Materials Science | cond-mat.soft cond-mat.mtrl-sci | | Affiliation: | School of Engineering and Applied Science, University of Pennsylvania and Department of Chemical Engineering and Materials Science, University of Minnesota | | Abstract: | Vesicles prepared in water from a series of diblock copolymers and termed "polymersomes" are physically characterized. With increasing molecular weight $ar{M}_n$, the hydrophobic core thickness $d$ for the self-assembled bilayers of polyethyleneoxide - polybutadiene (PEO-PBD) increases up to 20 $nm$ - considerably greater than any previously studied lipid system. The mechanical responses of these membranes, specifically, the area elastic modulus $K_a$ and maximal areal strain $alpha_c$ are measured by micromanipulation. As expected for interface-dominated elasticity, $K_a$ ($simeq$ 100 $pN/nm$) is found to be independent of $ar{M}_n$. Related mean-field ideas also predict a limiting value for $alpha_c$ which is universal and about 10-fold above that typical of lipids. Experiments indeed show $alpha_c$ generally increases with $ar{M}_n$, coming close to the theoretical limit before stress relaxation is opposed by what might be chain entanglements at the highest $ar{M}_n$. The results highlight the interfacial limits of self-assemblies at the nano-scale. | | Source: | arXiv, cond-mat/0110088 | | Services: | Forum | Review | PDF | Favorites | |
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