MSE Seminar - Dr. Ilona Kretzschman - The City University of New York

MSE Seminar
Event Date:
Monday, October 14, 2013 - 4:00pm to 5:00pm
Location:
MaRC Auditorium

Magnetic-and Electric-field assembly of Janus and Patchy Particles

Abstract:  Anisotropically surface modified particles, so-called patchy particles, have been recognized as important building blocks in the directed assembly of particles into desired target structures. Various methods employing shadow evaporation and templating have been used to create spherical particles with anchor patches of controllable size and position. Subsequently, patchy and Janus particles can be directed to assemble into interesting structures using magnetic or electric fields or can be linked chemically via molecular modification of the patches.

In this talk, we will report on the preparation of patchy particles using a combination of templates and glancing angle vapor deposition (GLAD) developed in our group. Simple geometrical models are used to predict the patch geometry and relative orientation of the patches. We will further report on the use of patch geometry, material, and position for the pre-programmed, field-directed assembly of such patchy particles in magnetic and electric fields and the potential application of these patchy particles in the assembly of new materials and rheological applications.

Biography: Ilona Kretzschmar received her Diploma (1996) and PhD (1999) degrees in Chemistry from the Technical University of Berlin. During her undergraduate studies, she spend one year in Dublin, Irland at the Dublin City University, Her graduate studies with Professor H. Schwarz, enabled her to work on reactions of metal cations with organic molecules in the gas phase employing Fourier-transform ion-cyclotron resonance (FTICR). In addition, she performed Guided-Ion Beam (GIB) mass spectrometry experiments aiding her PhD thesis work in the laboratory of Prof. Peter Armentrout at the University of Utah in Salt Lake City during two research visits. From 2000 to 2002, she was a Feodor-Lynen postdoctoral fellow at Harvard University, working on hydrocarbon radical-rearrangement reactions on clean and modified metal surfaces. Subsequently, she worked as a research associate in the Department of Electrical Engineering at Yale University in 2002 in the area of molecular electronics. Currently, she holds an associate professor position with tenure in the Chemical Engineering Department at the City College of New York. Her research interests range from particle surface modification via nanomaterials to molecular directed motion and assembly as well as emulsions.