Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 63, Issue -, Pages 179-186Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2013.09.011
Keywords
Biological membranes; steric pressure; membrane simulations
Funding
- University of Houston M.D. Anderson Professorship
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The complex interplay between the various attractive and repulsive forces that mediate between biological membranes governs an astounding array of biological functions: cell adhesion, membrane fusion, self-assembly, binding-unbinding transition among others. In this work, the entropic repulsive force between membranes-which originates due to thermally excited fluctuations-is critically reexamined both analytically and through systematic Monte Carlo simulations. A recent work by Freund (2013) has questioned the validity of a well-accepted result derived by Helfrich (1978). We find that, in agreement with Freund, for small inter-membrane separations (d), the entropic pressure scales as p similar to 1/d, in contrast to Helfrich's result: p similar to 1/d(3). For intermediate separations, our calculations agree with that of Helfrich and finally, for large inter-membrane separations, we observe an exponentially decaying behavior. (C) 2013 Elsevier Ltd. All rights reserved.
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