Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 2: Colloids and Nanoparticles

CPP 2.4: Talk

Monday, March 27, 2006, 11:00–11:15, ZEU 160

Janus particles at liquid/liquid interfaces — •Nicole Glaser, Alexander Böker, and Georg Krausch — Physikalische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany

Following recent theoretical predictions, we report on the first experiments on the interfacial assembly of so-called Janus nanoparticles, i.e. bifacial particles consisting of a gold and an iron oxide moiety, using pendant drop tensiometry. Our results show that the amphiphilicity derived from the Janus character of the particles leads to a significantly higher interfacial activity than observed for the respective homogeneous particles of the same size. This leads to a dramatic decrease in interfacial tension at the hexane-water interface during particle assembly. Furthermore, we demonstrate control over the interfacial activity by tuning the particle amphiphilicity via ligand exchange reactions.