In this study, transport properties of MWCNTs oxidized by two methods were tested by passing colloidal dispersions of MWCNTs through packed columns of glass beads, using both pulse and step inputs. The surface oxygen containing functional groups were characterized using X-ray Photoelectron Spectroscopy (XPS). Experiments were conducted at IS ranging from 0.5 to 1000 mM (NaCl) and at pH 4, 5.8 and 10.  Breakthough curves were collected by UV-Vis using a 5 cm flowthrough cuvette and then analyzed using a simple one dimensional convection-dispersion transport equation that included a first order removal term for colloid deposition. Spatial retention profiles were observed by extracting and analyzing deposited MWCNTs in 10 increments along the column length. The transport studies confirmed that attachment efficiency of MWNTs is increased at higher ionic strength and lower pH and decreased by the introduction of charged functional groups to the MWCNT surface.  Modeling of results is underway.

Transport of multiwalled carbon nanotubes through porous media

243rd National Meeting (2012)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.