Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.40: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Analysis of Particle-Particle Interaction Potentials of Nanoscaled Systems in Aqueous Solutions — •Julian Schulze1, Johannes Möller1, Michael Paulus1, Julia Nase1, Metin Tolan1, and Roland Winter2 — 1Fakultät Physik / DELTA, Technische Universität Dortmund, 44221Dortmund, Germany — 2Fakultät Chemie und Chemische Biologie, Technische Universität Dortmund, 44221 Dortmund, Germany
In previous studies, small-angle X-ray scattering (SAXS) was used to study the intermolecular interaction potential of proteins in aqueous solution under the influence of varying conditions such as pressure, temperature, ionic strength and cosolvents. A non-linear correlation between the strength J(p) of the attractive part of the protein-protein interaction and hydrostatic pressure was found with a minimum at ~2 kbar, which is probably related to changes in the water structure. Adding NaCl led to a linear increase of the attractive part of the interaction potential, while adding the osmolyte trimethylamine-N-oxid (TMAO) causes a shift of the minimum of J(p) to higher pressures. In the presented work, the pressure dependent structure factor of Ludox colloidal silica has been determined by SAXS. Spherical nanoparticles offer the advantages of an easy, pressure-independent inner structure and tunable surface properties. The results are compared to results found for the protein lysozyme, and differences and similarities will be discussed. Furthermore, the pressure dependent structure of the solvent itself has been explored by wide-angle X-ray scattering (WAXS).