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)


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
Number of pages4
ISBN (Print)1563969297
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
ISSN (Print)0094-243X


ConferenceNuclear and Condensed Matter Physics: VI Regional Conference


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