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Title: Surface multilayer adsorption and self-assembly of anionic surfactants induced by multivalent counterions
Author: Xu, Hui
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2013
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Abstract:
This research is focused on the effects of the multivalent counterions on the surface and solution properties of the anionic surfactants sodium oligoelhyiene glycol monoalkvl ether sui fates (sodium alkyl ether sulfate, SAES). The surface adsorption features at the air-water interface of sodium oligoethylene glycol monododecyl ether sulfates with different numbers of ethylene oxide groups (sodium lauryl ether sulfate, SLES) in the presence of trivalent counterion A13+, by the addition of AICI3. have been investigated by neutron reflectivity, NR, and surface tension, st. Tbe corresponding self-assembly structures in solutions have also been studied using small angle neutron scattering, SANS. The values of the critical micelle concentration (CMC) of SLES with one ethylene oxide, EO, group (SLES), with two EO groups (SLE,S) and with three EO groups (~LE3S) have been determined by ST measurements in Chapter 4. This chapter also includes initial NR measurements to assess the influence of the EO chain length on the surface packng of the SLES in the absence of any added counterions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.599999  DOI: Not available
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