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Event Information

MSE Seminar Series: Daeyeon Lee Friday, November 20, 2009 1:00 p.m. Room 2108, Chemical and Nuclear Engineering Bldg. For More Information: Joanne Kagle (301) 405-5240 jkagle@umd.edu Functional Nanoparticle Assemblies Based on Layer-by-Layer Assembly and Microfluidics Presented by Daeyeon Lee Professor, Department of Chemical and Biomolecular Engineering University of Pennsylvania Recent advances in materials chemistry have enabled the synthesis of nanoparticles with useful optical, catalytic, and magnetic properties. Assembly of these nanoparticles into functional structures, with precise control over their properties, would lead to great advances. However, it still remains a great challenge to achieve this goal through simple means. This presentation will discuss two methods – layer-by-layer (LbL) assembly and microfluidics – that have been utilized for the fabrication of functional thin films and microcapsules. In the first part of the talk, I will describe our work on the layer-by-layer assembly of all-nanoparticle thin films that exhibit antireflection, antifogging (superhydrophilicity), and self-cleaning properties. In addition, the importance of assembly condition for all-nanoparticle thin films based on electrostatic interactions will be discussed. In the second part of the talk, our recent efforts to generate semi-permeable microcapsules known as colloidosomes will be described. Monodisperse water-in-oil-in-water (W/O/W) double emulsions with a core-shell geometry are generated using glass capillary microfluidic devices. These double emulsions, in turn, are utilized as templates for fabrication of sophisticated new structures including colloidosomes. This Event is For: Graduate • Faculty • Post-Docs