Dresden 2017 – wissenschaftliches Programm
CPP 11.2: Vortrag
Montag, 20. März 2017, 15:15–15:30, ZEU 255
Controlling the Distance of Core-Shell Nanostructures via Star Polymers — •Qiyun Tang1, Christian Rossner2, Marcus Müller1, Philipp Vana2, and Otto Glatter3 — 1Institute für Theoretische Physik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Institute für Physikalische Chemie, Georg-August-Universität, Tammannstrasse 6, D-37077 Göttingen, Germany — 3Institute für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9/V, A-8010 Graz, Austria
Recent experiments have demonstrated that the star polymers can be used to precisely control the distance of core-shell nanostructures, which are formed by a single, large and multiple, small gold nanoparticles. Here we use a Monte Carlo simulation based on a coarse-grained bead-spring model to systematically study the distance scaling behaviour of this core-shell nanostructure. Our results show that these distances are mainly controlled by the position of free arm ends of star polymers, and the simulation results are in good agreement with the small-angle X-ray scattering (SAXS) results of core-shell nanostructures dispersed in solution. Interestingly, we found that the scaling of core shell distances for 2-arm, 3-arm, and 6-arm star polymers approaches one master curve as a function of the arm length of star polymers. We also found that increasing the arm number of star polymers could increase the density of free arm end groups, and therefore grab more small gold nanoparticles. Our results show the feasibility to precisely control the core-shell structures at the nanoscale.