Science Inventory

Interaction of Nanoparticles with Biofilms


SAHLE-DEMESSIE, E. Interaction of Nanoparticles with Biofilms. Presented at 2010 ACS National Meeting, Boston, MA, August 24, 2010.


To inform EPA


In this work we have studied the interaction and adsorption of engineered nanoparticles such as TiO2, ZnO, CeO2 , and carbon nanotubes with biofilms. Biofilm is an extracellular polymeric substance coating comprised of living material and it is an aggregation of bacteria, algae, fungi and protozoa enclosed in a matrix consisting of a mixture of polymeric compounds, primarily polysaccharides. A hydrogel made of polysaccharide found in agar was prepared for the coating of metal surfaces. Self-assembled monolayer polyoxyethylene containing amphiphiles on metal sheets were prepared. Hydrophobic chains 0.3 nm per EO moiety extend away from the surface. A detailed exploration of biofilm-nanoparticle matrices, i.e., adsorption, aggregation, dispersion, distribution and stability were carried out using surface sensitive analytical techniques including AFM, SEM/EDAX, and TEM. We have determined how the water chemistry affects the kinetics and thermodynamic of the adsorption of nano-particles on the biofilm. The use of ionic liquids in the making of the biofilm and how it affects the biofilm structure and properties.

Record Details:

Product Published Date: 08/24/2010
Record Last Revised: 03/30/2011
OMB Category: Other
Record ID: 234016