title: Adsorption at air-water and oil-water interfaces and self-assembly in aqueous solution of ethoxylated polysorbate nonionic surfactants.
abstract: The Tween nonionic surfactants are ethoxylated sorbitan esters, which have 20 ethylene oxide groups attached to the sorbitan headgroup and a single alkyl chain, lauryl, palmityl, stearyl, or oleyl. They are an important class of surfactants that are extensively used in emulsion and foam stabilization and in applications associated with foods, cosmetics and pharmaceuticals. A range of ethoxylated polysorbate surfactants, with differing degrees of ethoxylation from 3 to 50 ethylene oxide groups, have been synthesized and characterized by neutron reflection, small-angle neutron scattering, and surface tension. In conjunction with different alkyl chain groups, this provides the opportunity to modify their surface properties, their self-assembly in solution, and their interaction with macromolecules, such as proteins. Adsorption at the air-water and oil-water interfaces and solution self-assembly of the range of ethoxylated polysorbate surfactants synthesized are presented and discussed.
authors.affiliation: †Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom.|‡Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom.
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Penfold
authors.affiliation: †Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom.
authors.forename: Robert K
authors.initials: RK
authors.lastname: Thomas
authors.affiliation: †Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom.
authors.forename: Peixun X
authors.initials: PX
authors.lastname: Li
authors.affiliation: §Unilever Research and Development Laboratory, Quarry Road East, Port Sunlight, Wirral, Merseyside CH 62, United Kingdom.
authors.forename: Jordan T
authors.initials: JT
authors.lastname: Petkov
authors.affiliation: §Unilever Research and Development Laboratory, Quarry Road East, Port Sunlight, Wirral, Merseyside CH 62, United Kingdom.
authors.forename: Ian
authors.initials: I
authors.lastname: Tucker
authors.affiliation: ‡Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom.
authors.forename: John R P
authors.initials: JR
authors.lastname: Webster
authors.affiliation: ‡Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom.
authors.forename: Ann E
authors.initials: AE
authors.lastname: Terry
mesh_terms: D000327:Adsorption; D000388:Air; D008823:Micelles; D009821:Oils / Q000737:chemistry*; D011136:Polysorbates / Q000737:chemistry*; D012996:Solutions; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D008823:Micelles; D009821:Oils; D011136:Polysorbates; D012996:Solutions; D013501:Surface-Active Agents; D014867:Water