Gemini surfactants at the air/water interface: A fully atomistic molecular dynamics study

Article Abstract:

The results of fully atomistic molecular dynamics (MD) simulations of a series of Gemini surfactants, C5H25-[alpha],[omega]-bis([C12H25N.sup.+](CH3)2[Cl.sup.-]), at the air/water interface with s=3,4,6,12,14, and 16, at values of the initial surface area per surfactant [A.sub.s]= 70 [angstrom.sup.2], 77 [angstrom.sup.2], 95 [angstrom.sup.2], 151 [angstrom.sup.2], 151 [angstrom.sup.2], 133 [angstrom.sup.2], and 103 [angstrom.sup.2], respectively, are reported. The MD simulations are found to confirm the bending of the spacer toward the hydrophobic chains as the spacer length is increased and the spacer becomes more hydrophobic.

Monomolecular films, Structure, Hydrophobic effect

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Self-motion of a camphanic acid disk on water with different types of surfactants

Article Abstract:

An investigation on the control of the self-motion of a camphanic acid disk on water is conducted upon the different kinds of surfactants to the water phase. With an increase in the concentration of surfactant, continuous motion changed to no motion through intermittent motion, while the concentration regions of these motions are different among these surfactants.

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Computer simulations of catanionic surfactants adsorbed at air/water interfaces

Article Abstract:

Structural properties pertaining to mixtures of dodecytrimethylammonium/dodecylsulphate adsorbed at water/air interfaces are studied using molecular dynamics. The results demonstrate that the stable solvation structure of symmetric catanionic surfactants at infinite dilution corresponds to contact-head-ion pairs.

Absorption

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