Faculty of Engineering and Natural Sciences
Layer-by-Layer Assembled Multilayer Thin Films; Creating Functional Surfaces and Stimuli Responsive Nanocomposite Materials
Fevzi Cebeci, Ph.D.
Department of Materials Science and Engineering
A large spectrum of materials including, but not limited to charged polymers, carbon nanotubes and nanoparticles can be sequentially assembled onto surfaces from aqueous solutions to create thin film coatings with desired properties that are readily alterable at the nanoscale. These multilayer thin films can be assembled from polymer‐polymer, polymernanoparticle, polymer‐nanofiber, nanofiber‐ nanotube, and nanoparticle‐nanoparticle compositions with diverse architectures. Properties of these films can easily be tuned by controlling processing conditions such as solution pH and ionic strength.
First, multilayer thin films and several approaches to create functional coatings by versatile
layer‐by‐layer assembly techniques will be introduced. A variety of multifunctional coatings exhibiting super‐hydrophobic, anti‐reflection and anti‐fogging properties will be discussed. In the second part, a simple but effective approach to fabricate stimuli‐responsive nanocomposite assemblies of nanoparticles and nanofibers by layering polyelectrolytes will be addressed. Stimulus‐responsive percolative materials are of great interest due to expected dramatic changes in properties, in particular mechanical behavior, below and above the percolation threshold whereby the responsive units contact each other and form a continuous path through the entire system. These nanocomposite structures exhibit powerful advantages for the design and fabrication of multifunctional materials.
Nov. 13, 2009, 13:40, MDBF L035