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Wrinkling Labyrinth Patterns on Elastomeric Janus Particles

2011-05-12Journal article Open access
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dc.contributor.authorTrindade, A. C.
dc.contributor.authorCanejo, João
dc.contributor.authorPinto, L. F. V.
dc.contributor.authorPatricio, Pedro
dc.contributor.authorBrogueira, Pedro
dc.contributor.authorTeixeira, Paulo
dc.contributor.authorGodinho, Maria Helena
dc.date.accessioned2013-02-17T13:57:49Z
dc.date.available2013-02-17T13:57:49Z
dc.date.issued2011-05-12
dc.description.abstractWe describe a novel, low-cost and low-tech method for the fabrication of elastomeric Janus particles with diameters ranging from micrometers to millimeters. This consists of UV-irradiating soft urethane/urea elastomer spheres, which are then extracted in toluene and dried. The spheres are thus composed of a single material: no coating or film deposition steps are required. Furthermore, the whole procedure is carried out at ambient temperature and pressure. Long, labyrinthine corrugations ("wrinkles") appear on the irradiated portions of the particles' surfaces, the spatial periodicity of which can be controlled by varying the sizes of particles. The asymmetric morphology of the resulting Janus particles has been confirmed by scanning electron microscopy, atomic force microscopy, and optical microscopy. We have also established that the spheres behave elastically by performing bouncing tests with dried and swollen spheres. Results can be interpreted by assuming that each sphere consists of a thin, stiff surface layer ("skin") lying atop a thicker, softer substrate ("bulk"). The skin's higher stiffness is hypothesized to result from the more extensive cross-linking of the polymer chains located near the surface by the UV radiation. Textures then arise from competition between the effects of bending the skin and compressing the bulk, as the solvent evaporates and the sphere shrinks.por
dc.identifier.citationTrindade, A. C.; Canejo, J. P.; Pinto, L. F. V.; Patrício, P.; Brogueira, P.; Teixeira, P. I. C.; Godinho, M. H. - Wrinkling Labyrinth Patterns on Elastomeric Janus Particles. Macromolecules. ISSN 0024-9297. Vol. 44, nº7 (2011) p.2220-2228.por
dc.identifier.issn0024-9297
dc.identifier.urihttp://hdl.handle.net/10400.21/2260
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherAmer Chemical SOCpor
dc.subjectOil-water interfacepor
dc.subjectUrethane/Urea elastomerpor
dc.subjectSoft matterpor
dc.subjectSpherespor
dc.subjectFabricationpor
dc.subjectPolymerpor
dc.titleWrinkling Labyrinth Patterns on Elastomeric Janus Particlespor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceWashingtonpor
oaire.citation.endPage2228por
oaire.citation.issue7por
oaire.citation.startPage2220por
oaire.citation.titleMacromoleculespor
oaire.citation.volume44por
person.familyNameCanejo
person.familyNamePatricio
person.familyNameFélix Brogueira
person.familyNameTeixeira
person.familyNameGodinho
person.givenNameJoão
person.givenNamePedro
person.givenNamePedro Miguel
person.givenNamePaulo
person.givenNameMaria Helena
person.identifier.ciencia-id0D1B-EBDD-01CE
person.identifier.ciencia-idC616-BA77-E9C9
person.identifier.ciencia-idE411-CFB9-E1F2
person.identifier.ciencia-idB31A-0CBD-8AC4
person.identifier.ciencia-idC316-7B1F-4513
person.identifier.orcid0000-0002-5361-7368
person.identifier.orcid0000-0002-9050-9956
person.identifier.orcid0000-0001-6069-4073
person.identifier.orcid0000-0003-2315-2261
person.identifier.orcid0000-0002-9760-5983
person.identifier.ridJ-5011-2013
person.identifier.ridA-2750-2009
person.identifier.ridA-2682-2009
person.identifier.ridJ-3679-2013
person.identifier.scopus-author-id6507609001
person.identifier.scopus-author-id7005895098
person.identifier.scopus-author-id7005654016
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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