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Formation of fluorinated nonionic surfactant microemulsions in hydrofluorocarbon 134a (HFC 134a)

Patel, N. ORCID: https://orcid.org/0000-0002-8600-0663, Marlow, M. and Lawrence, M. J. (2003) Formation of fluorinated nonionic surfactant microemulsions in hydrofluorocarbon 134a (HFC 134a). Journal of Colloid and Interface Science, 258 (2). pp. 345-353. ISSN 0021-9797

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To link to this item DOI: 10.1016/S0021-9797(02)00072-3

Abstract/Summary

A structurally related series of fluorinated nonionic oxyethylene glycol surfactants of the type C(m)F(2m+1)(CH(2))(n)O[(CH(2)CH(2)O)(p)H], denoted C(m.n)E(p) (where m=4, 6, or 7, m=1 or 2, and p=4 or 6) were synthesized and their surface behavior in aqueous solution was characterized. The ability of these surfactants to form water-in-hydrofluorocarbon (HFC) propellant 134a microemulsions suitable for use in the aerosolized delivery of water-soluble drugs has been investigated. Phase studies showed that, regardless of the composition used, clear one-phase systems could not be prepared if a fluorinated nonionic surfactant was used alone, or in combination with a short or medium fluorocarbon alcohol cosurfactant. Clear one-phase systems could, however, be prepared if a short-chain hydrocarbon alcohol, such as ethanol, n-propanol, or n-pentanol, was used as cosurfactant, with the extent of the one-phase region increasing with decreased chain length of the alcohol cosurfactant. Light-scattering studies on a number of the hydrocarbon-alcoholcontaining systems in the propellant-rich part of the phase diagram showed that only systems prepared with C(4.2)E(6) and propanol contained microemulsion droplets (all other systems investigated were considered to be cosolvent systems).

Item Type:Article
Refereed:Yes
Divisions:No Reading authors. Back catalogue items
ID Code:37507
Uncontrolled Keywords:Microemulsion; Fluorinated nonionic surfactant; HFC 134a; Light scattering; Phase behavior
Publisher:Elsevier

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