PMID: 15244532Jul 13, 2004Paper

Electrostatic attraction between neutral microdroplets by ion fluctuations

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Yu-Jane Sheng, Heng-Kwong Tsao

Abstract

The interaction between two aqueous droplets containing ions is investigated. The ion-fluctuation correlation gives rise to attraction between two neutral microdroplets, similar to the van der Waals interaction between neutral atoms. Electrostatic attraction consists of contributions from various induced multipole-multipole interactions, including dipole-dipole < P(2)(z) >(2) r(-6), dipole-quadrupole < P(2)(z) > < Q (2)(zz ) > r(-8), dipole-octupole < P(2)(z) > < O (2)(zzz ) > r(-10), and quadrupole-quadrupole interactions < Q (2)(zz ) >(2) r(-10). The mean-square multipole moments are determined analytically by linear response theory. The fluctuation-driven attraction is so strong at short distance that it may dominate over the Coulomb repulsion between like-charged droplets. These theoretical results are confirmed by Monte Carlo simulations.

References

Apr 1, 1986·Physical Review A: General Physics·G S GrestA L Bug
Oct 28, 1985·Physical Review Letters·S BhattacharyaJ S Huang
Aug 22, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Heng-Kwong TsaoShing-Bor Chen
Nov 22, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Yu-Jane Sheng, Heng-Kwong Tsao
Aug 9, 2003·Physical Review Letters·X F HanC C Huang

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Citations

Jun 13, 2009·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Wei ChenPenger Tong
Jul 27, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Itamar Borukhov, S A Safran

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