Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster: Colloids and Complex Liquids
CPP 20.24: Poster
Tuesday, March 12, 2013, 18:15–20:15, Poster C
Controlling the cross-linker distribution and shell thickness of gold-poly-NIPAM core-shell colloids — •Matthias Karg1, Paul Mulvaney2, Sabine Rosenfeldt3, and Sarah Jaber2 — 1Universität Bayreuth, Physikalische Chemie - Kolloidale Systeme — 2University of Melbourne, School of Chemistry & Bio21 Institute — 3Universität Bayreuth, Physikalische Chemie I
The encapsulation of inorganic nanoparticles with responsive polymer networks has attracted significant interest in recent years, since such materials can combine properties of their different components. Most effort so far was devoted to the encapsulation of different inorganic cores such as silica, gold and silver nanoparticles. It has been demonstrated that cores with a broad range of sizes can be used to build up such core-shell colloids. The present contribution focuses on the control of the polymer network structure rather than on the nanoparticle core. We encapsulated 15 nm gold nanoparticles into thermoresponsive polymer shells composed of NIPAM with a constant feeding of the cross-linker BIS during the polymerization. This leads to core-shell colloids with single nanoparticle cores well encapsulated in homogenously cross-linked poly-NIPAM shells. Additional polymerization steps can be used to overgrow the shells still keeping the cross-linker distribution homogeneous. Analysis using TEM, AFM and UV-Vis-spectroscopy will be presented. The shell morphology was investigated with SANS. An Ornstein-Zernicke analysis of the scattering profiles clearly reveals a homogenous network structure with correlation lengths of approx. 1.5 nm.