Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 474, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2015.02.047
Keywords
Adsorption isotherm; Adsolubilization; Polymer encapsulation; Multi-walled carbon nanotubes; Nanocomposites; Thin-films
Categories
Funding
- United States Department of Energy
- NSF [0923247]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0923247] Funding Source: National Science Foundation
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Admicellar polymerization (AP), a surface analog of emulsion polymerization was used to obtain a thin layer of hydrophilic polymer coating on multi-walled carbon nanotubes (MWCNTs). The hydrophilic nature can facilitate integration of carbon nanotubes into a variety of composite materials. To develop hydrophilic polymer by AP, acrylate monomers were copolymerized using sodium dodecyl sulfate as a surfactant. Development of a system for AP involves measurement of surfactant adsorption and adsolubilization or partitioning of monomer into adsorbed structures (reverse hemimicelles). A modified two-site adsolubilization model was used to calculate the size of surfactant aggregates over the surface of MWCNTs and a binary adsolubilization model was employed to predict number of monomers adsolubilized from single component experiments. Adsolubilized monomers were polymerized to form a polymer nanocomposite, which was then hydrolyzed to obtain a hydrophilic nanocomposite. SEM, energy dispersive spectroscopy (EDS), thermo gravimetric analysis (TGA) and FT-IR confirmed the formation of polymer on multi-walled carbon nanotubes (MWCNTs). Modified MWCNTs readily dispersed in aqueous media and were stable after 3 days. (C) 2015 Elsevier B.V. All rights reserved.
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