QENS from polymeric micelles in supercritical CO2

R Triolo, Valeria Arrighi, Alessandro Triolo, P Migliardo, S Magazu, J B McClain, D Betts, J M DeSimone, H D Middendorf

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

We report QENS measurements from PS-b-PFOA aggregates in supercritical CO2. These consist of dense cores of CO2-insoluble polystyrene surrounded by a `corona' of PFOA surfactant molecules whose CO2-philic groups interface with supercritical CO2. Lineshapes are dominated by localised diffusive modes and segmental dynamics of the anchored finite-length PFOA chains. For Q degrees similar to 0.6 Angstrom(-1), we obtain effective diffusion coefficients of approximate to 0.8x10(-6) cm(2)/sec. At higher Q, a single component is not sufficient as shown by excess intensity on the flanks. For Q>1.5 Angstrom(-1), the wings reflect contributions due to a distribution of faster, more localised chain modes.
Original languageEnglish
Title of host publicationNuclear and Condensed Matter Physics
Subtitle of host publicationVI Regional Conference
EditorsAntonino Messina
PublisherAmerican Institute of Physics
Pages234-237
Number of pages4
Volume513
ISBN (Print)1563969297
DOIs
Publication statusPublished - 2000
EventNuclear and Condensed Matter Physics: VI Regional Conference - Palermo, Italy
Duration: 14 Oct 199915 Oct 1999

Publication series

NameAIP Conference Proceedings
PublisherAmerican Institute of Physics
Volume513
ISSN (Print)0094-243X

Conference

ConferenceNuclear and Condensed Matter Physics: VI Regional Conference
CountryItaly
CityPalermo
Period14/10/9915/10/99

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