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Cosurfactant and cosolvent effects on surfactant self-assembly in supercritical carbon dioxide

J. Chem. Phys. 122, 094710 (2005); doi:10.1063/1.1855291

Published 28 February 2005

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Naresh Chennamsetty, Henry Bock, Lauriane F. Scanu, Flor R. Siperstein, and Keith E. Gubbins
Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905
The impact of alcohol additives on the self-assembly of surfactants in supercritical carbon dioxide is investigated using lattice Monte Carlo simulations. We observe that all studied (model) alcohols reduce the critical micelle concentration. The reduction is stronger the longer the hydrocarbon chain of the alcohol, and the higher the alcohol concentration. Short-chain alcohols are found to concentrate in the surfactant layer of the aggregates, replacing surfactant molecules and leading to a strong decrease of the aggregation number and a large increase of the number of aggregates. On the other hand, only a small number of alcohol molecules with longer chain length are found in the aggregates, leading to a slight increase in the aggregation number. However, structural properties such as size and density profiles of aggregates at the same aggregation number are not influenced markedly. Consequently, short-chain alcohols act as cosurfactants, directly influencing the properties of the aggregates, while alcohols with longer hydrocarbon chains work as cosolvents, altering the properties of the solvent. However, the transition between both extremes is gradual. ©2005 American Institute of Physics
History: Received 12 August 2004; accepted 9 December 2004; published 28 February 2005
Permalink: http://link.aip.org/link/?JCPSA6/122/094710/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.18.-g
    Langmuir-Blodgett films on liquids
  • 82.70.Uv
    Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems including hydrophilic and hydrophobic interactions
  • 61.20.Ja
    Computer simulation of liquid structure
  • 05.50.+q
    Lattice theory and statistics including Ising, Potts models, etc
  • 82.70.Dd
    Colloids
  • YEAR: 2005

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ISSN:
0021-9606 (print)   1089-7690 (online)
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