Entropy contribution to the line tension: Insights from polymer physics,water string theory, and the three-phase tension

Edward Bormashenko

doi:10.3390/e20090712

Entropy contribution to the line tension: Insights from polymer physics,water string theory, and the three-phase tension

Edward Bormashenko

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The notion of three-phase (line) tension remains one of the most disputable notions in surface science. A very broad range of its values has been reported. Experts even do not agree on the sign of line tension. The polymer-chain-like model of three-phase (triple) line enables rough estimation of entropic input into the value of line tension, estimated as Γ_en ≅ k_BT/d_m ≅ 10_-11N, where d_m is the diameter of the liquid molecule. The introduction of the polymer-chain-like model of the triple line is justified by the "water string" model of the liquid state, predicting strong orientation effects for liquid molecules located near hydrophobic moieties. The estimated value of the entropic input into the line tension is close to experimental findings, reported by various groups, and seems to be relevant for the understanding of elastic properties of biological membranes.

Original language	English
Article number	712
Journal	Entropy
Volume	20
Issue number	9
DOIs	https://doi.org/10.3390/e20090712
State	Published - 16 Sep 2018

Keywords

Entropic contribution
Entropic force
Hydrophobic substrate
Line tension
Orientation effect

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10.3390/e20090712

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abstract = "The notion of three-phase (line) tension remains one of the most disputable notions in surface science. A very broad range of its values has been reported. Experts even do not agree on the sign of line tension. The polymer-chain-like model of three-phase (triple) line enables rough estimation of entropic input into the value of line tension, estimated as Γen ≅ kBT/dm ≅ 10-11N, where dm is the diameter of the liquid molecule. The introduction of the polymer-chain-like model of the triple line is justified by the {"}water string{"} model of the liquid state, predicting strong orientation effects for liquid molecules located near hydrophobic moieties. The estimated value of the entropic input into the line tension is close to experimental findings, reported by various groups, and seems to be relevant for the understanding of elastic properties of biological membranes.",

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Entropy contribution to the line tension: Insights from polymer physics,water string theory, and the three-phase tension

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