Molecular Interfaces

Hubert Motschmann and Matthias Hofmann, University of Regensburg, Germany.

• From theContent:Condensed phase are the consequence of intermolecular forces- Van der Waals forces are short range and weak-Keesom- Debye-London-Overlap repulsion-Lennard Jones Potential describes intermolecular attractive and repulsive interactionMD simulations-Pair correlation Kirkwood buff MDSurface tension: Molecules at an interface are differently bound as compared to the bulk-Measuring surface tensions-Ring technique-Pendent drop-Oscillating bubble devices-Very low surface tensions: Spinning drop-Facettes of surface tension: Minimizing surface area-Steiner Network Problem: calculus of variationFive laws of interfacial engineering: Minimizing surface free energy-Hamakerer law: The summation of short range intermolecular interaction lead to strong and long range interaction between colloidal objects- Kelvin law: There is a barrier in forming new phases-Young law governs the wetting properties-Laplace law Cuvature matters-Gibbs law: reducing G by adsorptionExperimental technique-Surface force apparatus-AFM colloidal Probe-X-ray and neutron reflectometry-QCM-Optical reflection techniques-Nonlinear optical technique of the second orderClassical problems seen in the light of new experiments-Ions at interface-Ions may adopt a nonmonotoneous concentration profile-Interfacial water as a sensitive probe-Hofmeister effects-Wetting phenomena-Microstructures surfaces- Surving under extrem conditios-Adsorption phenomena-Illuminating the molecular architectureNonequilibrium states and dynamics-Surface rheology-Different time scales need different instrumentations-Langmuir-Oscillating drop-Oscillating bubble-FoamsAssembly: designing complex molecular architecture-Layer-by layer technique-Self assembled monolayers-Stimuli responsive systems-Adsorption-What is at the interface-How much is at the interface isotherm kinetics-Combining techniques QCM-Nonequlibrium states dynamics-Experimental techniques-X-ray-Neutronscattering- Optical reflection-AFM-Organization in two dimension Langmuir-Wetting properties