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From a new cellulose solvent to the cyclodextrin induced formation of hydrogels

2017-11Journal article Restricted access
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dc.contributor.authorMedronho, Bruno
dc.contributor.authorDuarte, Hugo
dc.contributor.authorMagalhaes, Solange
dc.contributor.authorAlves, Luis
dc.contributor.authorValente, Artur J. M.
dc.contributor.authorRomano, Anabela
dc.date.accessioned2019-11-20T15:07:12Z
dc.date.available2019-11-20T15:07:12Z
dc.date.issued2017-11
dc.description.abstractA new efficient solvent for cellulose dissolution was developed based on the mixture of aqueous tetrabutylammonium hydroxide, TBAH(aq) and an organic co-solvent, dimethylsulfoxide (DMSO). Clear cellulose solutions were readily obtained at mild conditions in a few minutes. The viscoeleastic properties of the dopes formed are found to be dependent on the cellulose content and TBAH(aq)/DMSO ratio. Additionally, stiff hydrogels are formed when adding beta-cyclodextrin (beta-CD) to the cellulose dopes. The formation of a host-guest complex between the beta-CD and the tetrabutylammonium cations (TBA(+)), which presumably destabilizes the cellulose solution state triggering the hydrogel formation, is suggested as mechanism. The robust hydrogels formed have been characterized regarding their viscoelasticity, microscopic morphology and release properties. The kinetics and released amount of the TBA(+) from the cellulose gel matrixes are found to be strongly dependent on the balance between average pore diameter, surface area and free volume of the hydrogels. (C) 2017 Elsevier B.V. All rights reserved.
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT) [PTDC/AGR-TEC/4814/2014, UID/QUI/UI0313/2013, IF/01005/2014]
dc.identifier.doi10.1016/j.colsurfa.2017.03.047
dc.identifier.issn0927-7757
dc.identifier.issn1873-4359
dc.identifier.urihttp://hdl.handle.net/10400.1/12926
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science Bv
dc.subjectAqueous Tetrabutylammonium Hydroxide
dc.subjectN-Butylphosphonium Hydroxide
dc.subjectWheat-Straw
dc.subjectDissolution
dc.subjectMechanisms
dc.subjectDiffusion
dc.subjectBiomass
dc.subjectNmr
dc.titleFrom a new cellulose solvent to the cyclodextrin induced formation of hydrogels
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage555
oaire.citation.startPage548
oaire.citation.titleColloids and Surfaces A-Physicochemical and Engineering Aspects
oaire.citation.volume532
person.familyNameMedronho
person.familyNameRomano
person.givenNameBruno
person.givenNameAnabela
person.identifier.ciencia-id6918-9AB3-8D22
person.identifier.ciencia-id8A18-7E9A-3B0E
person.identifier.orcid0000-0003-0972-1739
person.identifier.orcid0000-0002-7204-7428
person.identifier.ridP-5927-2014
person.identifier.scopus-author-id9940656700
person.identifier.scopus-author-id56249997600
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication4c03571a-93da-4504-8acf-c74326449852
relation.isAuthorOfPublicatione3343b60-17d3-4f5e-a2bf-06f26da69206
relation.isAuthorOfPublication.latestForDiscoverye3343b60-17d3-4f5e-a2bf-06f26da69206

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