期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 346, 期 2, 页码 296-302出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.03.029
关键词
Fullerene; Fullerol; Aggregation; Transmembrane pressure; Stability; Ionic bridging
资金
- Center for the Environmental Implications of Nanotechnology
- National Science Foundation
- US Environmental Protection Agency
- Div Of Biological Infrastructure
- Direct For Biological Sciences [830093] Funding Source: National Science Foundation
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.
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