Adsorption at a solid-liquid interface

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dc.contributor.authorGerth, Sen_AU
dc.contributor.authorNelson, Aen_AU
dc.contributor.authorKlimczak, Men_AU
dc.contributor.authorSteinrück, HGen_AU
dc.contributor.authorWeißer, Men_AU
dc.contributor.authorMagerl, Aen_AU
dc.date.accessioned2025-03-14T03:32:37Zen_AU
dc.date.available2025-03-14T03:32:37Zen_AU
dc.date.issued2012-07-25en_AU
dc.date.statistics2024-11-21en_AU
dc.descriptionPhysical copy held by ANSTO Library at DDC: 539.758/30en_AU
dc.description.abstractSurfactants from tri-block copolymers are well known for the reduction of surface tension or friction at an interface. We investigate the tri-block copolymer Pluronic® P123 consisting of a central part of 70 propylene oxide (PO) units terminated by two end groups of 20 ethylene oxide (EO) units (E020 - PO70 — E020). In concentrated solutions above 27 weight percent (wtp) and at intermediate temperatures the micelles self-assemble into crystalline structures. In addition we found a near surface crystallization for a diluted P123 system below the critical temperature and concentration for bulk crystallization. Different chemical surface treatments (hydrophilic or hydrophobic) influence this near-interface ordering. The initiation of crystal growth is preferred at an attractive interface, whereas no layering of micelles is observable for a hydrophobic coating. The build up of a Bragg peak at Q w 0.05 A1 observed in reflectometry provides evidence for a micellar layering at the surface. We note, that this dense surface structure is present under conditions where there is no bulk crystallization. To access the stability of the surface layer, we have studied the destruction and the kinematic recovery of this surface layer under shear. To this end we have built a cone-plate shear device suitable for in-situ neutron reflectometry. The recovery of the adsorbed micellar layer in dependence of a previously applied shear rate, temperature and polymer concentration yields a nucleation time for layer growth. In addition, the structural fidelity of the adsorbed layer system is elucidated by the integrated Bragg intensity.en_AU
dc.identifier.booktitleSXNS12, 12th International Conference on Surface X-Ray and Neutron Scattering, 25-28 July 2012en_AU
dc.identifier.citationGerth, S., Nelson, A., Klimczak, M., Steinrück, H.-G., Weißer, M., & Magerl, A. (2012). Adsorption at a solid-liquid interface. Poster presented to SXNS12, 12th International Conference on Surface X-Ray and Neutron Scattering, 25-28 July 2012, Kolkata, India, (pp. 129).en_AU
dc.identifier.conferenceenddate2012-07-28en_AU
dc.identifier.conferencenameSXNS12, 12th International Conference on Surface X-Ray and Neutron Scatteringen_AU
dc.identifier.conferenceplaceKolkata, Indiaen_AU
dc.identifier.conferencestartdate2012-07-25en_AU
dc.identifier.pagination129en_AU
dc.identifier.placeofpublicationKolkata, Indiaen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16061en_AU
dc.language.isoenen_AU
dc.publisherSaha Institue of Nuclear Physicsen_AU
dc.subjectAdsorptionen_AU
dc.subjectSurfactantsen_AU
dc.subjectCopolymersen_AU
dc.subjectSurface tensionen_AU
dc.subjectPropyleneen_AU
dc.subjectOxidesen_AU
dc.subjectCrystal structureen_AU
dc.subjectEthyleneen_AU
dc.subjectReflectivityen_AU
dc.subjectBragg reflectionen_AU
dc.titleAdsorption at a solid-liquid interfaceen_AU
dc.typeConference Posteren_AU
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