Center for Functional Nanomaterials Seminar
"Soft Matter in Hard Confinement: How molecular fluids arrange in and huddle through nanoporous solids"
Presented by Patrick Huber, Materials Physics, Hamburg University of Technology, Germany
Friday, January 24, 2014, 11 am
CFN, Building 735, Conf. Rm. A
Hosted by: Oleg Gang
Center for Functional Nanomaterials Seminar Soft Matter in Hard Confinement: How molecular fluids arrange in and huddle through nanoporous solids Patrick Huber Materials Physics, Hamburg University of Technology, Germany Friday, January 24, 2014 11:00 a.m. Bldg. 735 â€" Conference Room A The properties of molecular assemblies confined in pores a few nanometers across play a dominant role in phenomena ranging from clay swelling, frost heave, oil recovery and catalysis, to colloidal stability, protein folding and transport in cells and tissues. Therefore the advent of tailorable nano- and mesoporous membranes, most prominently arrays of carbon nanotube bundles, of silicon, silica and alumina channels, has led to a growing interest in the equilibrium and non-equilibrium behavior of solids and liquids confined in such nanoporous media. In the first part of my talk I will present X-ray diffraction measurements on the crystallization and glass formation of molecular assemblies in monolithic porous silica and silicon as a function of the complexity of their basic building blocks (water, n-alkanes, n-alcohols, liquid crystals). The second part of my talk addresses dynamical phenomena in nanopores ranging from self-diffusion and liquid flow to pore translocation, as probed by neutron spin-echo spectroscopy, radiography, and gravimetrical imbibition experiments. Depending on the molecular species investigated a remarkable robustness of macroscopic concepts, however, also significant deviations from the bulk behavior are observable. Host: Oleg Gang