Elastic properties of surfactant monolayers at liquid-liquid interfaces: A molecular dynamics study
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Elastic properties of surfactant monolayers at liquid-liquid interfaces : A molecular dynamics study. / Laradji, Mohamed; Mouritsen, Ole G.
In: Journal of Chemical Physics, Vol. 112, No. 19, 15.05.2000, p. 8621-8630.Research output: Contribution to journal › Journal article › peer-review
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TY - JOUR
T1 - Elastic properties of surfactant monolayers at liquid-liquid interfaces
T2 - A molecular dynamics study
AU - Laradji, Mohamed
AU - Mouritsen, Ole G.
PY - 2000/5/15
Y1 - 2000/5/15
N2 - Using a simple molecular model based on the Lennard-Jones potential, we systematically study the elastic properties of liquid-liquid interfaces containing surfactant molecules by means of extensive and large-scale molecular dynamics simulations. The main elastic constants of the interface, corresponding to the interfacial tension and the mean bending modulus are determined from the analyses of the long-wavelength behavior of the structure factor of the capillary waves. We found that the interfacial tension decreases with increasing surfactant interfacial coverage and/or surfactant chain length. However, we found that the corresponding change in the bending rigidity is nonmonotonic. Specifically, we found that the bending rigidity decreases with increasing surfactant interfacial coverage for small surfactant interface coverages, but then it increases as the surfactant interface coverage is further increased. Using a Gaussian theory on an interfacial Ginzburg-Landau model of surfactants, we find that the initial decrease of the bending rigidity is attributed to coupling between fluctuations of the surfactant orientation field to those in the interfacial height.
AB - Using a simple molecular model based on the Lennard-Jones potential, we systematically study the elastic properties of liquid-liquid interfaces containing surfactant molecules by means of extensive and large-scale molecular dynamics simulations. The main elastic constants of the interface, corresponding to the interfacial tension and the mean bending modulus are determined from the analyses of the long-wavelength behavior of the structure factor of the capillary waves. We found that the interfacial tension decreases with increasing surfactant interfacial coverage and/or surfactant chain length. However, we found that the corresponding change in the bending rigidity is nonmonotonic. Specifically, we found that the bending rigidity decreases with increasing surfactant interfacial coverage for small surfactant interface coverages, but then it increases as the surfactant interface coverage is further increased. Using a Gaussian theory on an interfacial Ginzburg-Landau model of surfactants, we find that the initial decrease of the bending rigidity is attributed to coupling between fluctuations of the surfactant orientation field to those in the interfacial height.
UR - http://www.scopus.com/inward/record.url?scp=0001610210&partnerID=8YFLogxK
U2 - 10.1063/1.481486
DO - 10.1063/1.481486
M3 - Journal article
AN - SCOPUS:0001610210
VL - 112
SP - 8621
EP - 8630
JO - The Journal of Chemical Physics
JF - The Journal of Chemical Physics
SN - 0021-9606
IS - 19
ER -
ID: 236895894