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Improving Colloidal Stability of Sepiolite Suspensions: Effect of the Mechanical Disperser and Chemical Dispersant

2020-09-02Journal article Open access
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dc.contributor.authorAlves, Luís
dc.contributor.authorFerraz, Eduardo
dc.contributor.authorSantarén, Julio
dc.contributor.authorRasteiro, Maria G.
dc.contributor.authorGamelas, José A. F.
dc.date.accessioned2021-12-22T23:44:32Z
dc.date.available2021-12-22T23:44:32Z
dc.date.issued2020-09-02
dc.date.updated2021-12-22T19:45:33Z
dc.description.abstractTo allow the use of fibrous-like clays, as sepiolite, in different applications, their disaggregation and the formation of stable suspensions are crucial steps to enhance their performance significantly, e.g., in cellulose nanofibrils/clay composite formulations, enabling an adequate mixture of the matrix and filler individual components. Three distinct physical treatments of dispersion (magnetic stirring, high-speed shearing, and ultrasonication) and four different chemical dispersants (polyacrylate, polyphosphate, carboxymethylcellulose, and alginate, all in the form of sodium salts) were tested to improve the dispersibility and the formation of stable suspensions of sepiolite. Two sepiolite samples from the same origin but with different pre-treatments were evaluated. The particle size and suspension stability were evaluated by dynamic light scattering, zeta potential measurements and optical microscopy. Additionally, the sepiolite samples were initially characterized for their mineralogical, chemical, and morphologic properties. Of the three physical dispersion treatments tested, the ultrasonicator typically produced more stable suspensions; on the other hand, the biopolymer carboxymethylcellulose showed a higher ability to produce stable suspensions, being, however, a smaller particle size obtained when polyphosphate was used. Remarkably, 47 out of 90 prepared suspensions of sepiolite stayed homogeneous for at least three months after their preparation. In sum, the combination of a high energy dispersing equipment with an appropriate dispersing agent led to stable suspensions with optimal properties to be used in different applications, like in the composite production.pt_PT
dc.description.sponsorshipThe authors acknowledge Luís Maria, Eirini Potsi, and Solange Magalhães for the help in the preparation of a few suspensions, particle size and zeta potential measurements.pt_PT
dc.description.sponsorshipCENTRO-01-0145-FEDER-031884
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3390/min10090779pt_PT
dc.identifier.slugcv-prod-2120358
dc.identifier.urihttp://hdl.handle.net/10400.26/38423
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationNew generation of composite films of cellulose nanofibrils with mineral particles as high strength materials with gas barrier properties
dc.relation.publisherversionhttps://www.mdpi.com/2075-163X/10/9/779pt_PT
dc.subjectfibrous claypt_PT
dc.subjectdispersionpt_PT
dc.subjectorganic-inorganic hybridpt_PT
dc.subjectbionanocompositept_PT
dc.titleImproving Colloidal Stability of Sepiolite Suspensions: Effect of the Mechanical Disperser and Chemical Dispersantpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleNew generation of composite films of cellulose nanofibrils with mineral particles as high strength materials with gas barrier properties
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FQUI-OUT%2F31884%2F2017/PT
oaire.citation.endPage779pt_PT
oaire.citation.issue9pt_PT
oaire.citation.startPage779pt_PT
oaire.citation.titleMineralspt_PT
oaire.citation.volume10pt_PT
oaire.fundingStream9471 - RIDTI
person.familyNameFerraz
person.givenNameEduardo
person.identifier.ciencia-idC517-A240-7C81
person.identifier.orcid0000-0003-4717-6305
person.identifier.ridB-7140-2014
person.identifier.scopus-author-id7003480912
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.cv.cienciaidC517-A240-7C81 | Eduardo Jorge Marques de Oliveira Ferraz
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication94c2590f-fd7a-44e1-b6cd-31297c9da934
relation.isAuthorOfPublication.latestForDiscovery94c2590f-fd7a-44e1-b6cd-31297c9da934
relation.isProjectOfPublication14949fdf-d268-4ae5-9f3c-5c346049b23d
relation.isProjectOfPublication.latestForDiscovery14949fdf-d268-4ae5-9f3c-5c346049b23d

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