Membrane filtration of fullerene nanoparticle suspensions: Effects of derivatization, pressure, electrolyte species and concentration

TitleMembrane filtration of fullerene nanoparticle suspensions: Effects of derivatization, pressure, electrolyte species and concentration
Publication TypeJournal Article
Year of Publication2010
AuthorsJassby D, Chae SR, Hendren Z, Wiesner MR
JournalJournal of Colloid and Interface Science
Volume346
Pagination296-302
Date PublishedJun
Type of ArticleArticle
ISBN Number0021-9797
Accession Numberhttp://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ResearchSoft&SrcApp=EndNote&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000277482200003
KeywordsAGGREGATION, aqueous suspensions, c-60, films, Fullerene, Fullerol, Ionic bridging, NANOMATERIALS, Stability, Transmembrane pressure, WATER
Abstract

Particle aggregation is induced in derivatized fullerene (fullerol) suspensions by introducing different counter-ion species (Na+ Ca2+ and Mg2+) and concentrations. The suspensions are filtered through 20 nm ceramic membranes under different transmembrane pressures, and the removal efficiency is compared. In all cases, the average hydrodynamic radius far exceeded the average pore diameter of the membrane. In the case of mono-valent counter-ions, removal efficiency is influenced by transmembrane pressure, with higher removal efficiencies achieved at lower pressures. In contrast, removal efficiencies of fullerol suspensions destabilized with di-valent ions are insensitive to transmembrane pressure, similar to what was found in the case of non-derivatized fullerene. Scanning Electron Microscope (SEM) images of post-filtration membranes indicate that fullerol aggregates destabilized with Mg2+ ions deform and partially penetrate the membrane, but are ultimately trapped. The proposed mechanism suggests that di-valent ions act as bridges between fullerol aggregates, forming strong bonds that were not broken under the experimental conditions. These strong bonds may allow aggregated fullerol particles to deform under high pressure, and partially penetrate the membrane. Mono-valent ions are incapable of functioning as bridges, and subsequently, when sufficient pressure is applied, fullerol aggregates will break apart and pass through the membrane. (C) 2010 Elsevier Inc. All rights reserved.

URLhttp://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ResearchSoft&SrcApp=EndNote&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000277482200003
Alternate JournalJ. Colloid Interface Sci.