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Polymersomes at the solid-liquid interface: Dynamic morphological transformation and lubrication
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
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2018 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 512, 260-271 p.Article in journal (Refereed) Published
Abstract [en]

Polymersomes are hollow spheres self-assembled from amphiphilic block copolymers of certain molecular architecture. Whilst they have been widely studied for biomedical applications, relatively few studies have reported their interfacial properties. In particular, lubrication by polymersomes has not been previously reported. Here, interfacial properties of polymersomes self-assembled from poly(butadiene)-poly(ethylene oxide) (PBD-PEO; molecular weight 10,400 g mol−1) have been studied at both hydrophilic and hydrophobic surfaces. Their morphology at silica and mica surfaces was imaged with quantitative nanomechanical property mapping atomic force microscopy (QNM AFM), and friction and surface forces they mediate under confinement between two surfaces were studied using colloidal probe AFM (CP-AFM). We find that the polymersomes remained intact but adopted flattened conformation once adsorbed to mica, with a relatively low coverage. However, on silica these polymersomes were unstable, rupturing to form donut shaped residues or patchy bilayers. On a silica surface hydrophobized with a 19 nm polystyrene (PS) film, the polymer vesicles formed a more stable layer with a higher surface coverage as compared to the hydrophilic surface, and the interfacial structure also evolved over time. Moreover, friction was greatly reduced on hydrophobized silica surfaces in the presence of polymersomes, suggesting their potential as effective aqueous lubricants.

Place, publisher, year, edition, pages
Academic Press, 2018. Vol. 512, 260-271 p.
Keyword [en]
Adsorption, Block-copolymers, Lubrication, Polymer vesicles, Polymersomes, Self-assembly, Solid-liquid interface
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-217541DOI: 10.1016/j.jcis.2017.10.065ISI: 000418729500029PubMedID: 29073467Scopus ID: 2-s2.0-85032879626OAI: oai:DiVA.org:kth-217541DiVA: diva2:1156920
Funder
EU, FP7, Seventh Framework Programme, 290251
Note

QC 20171114

Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2018-01-11Bibliographically approved

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