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Deep eutectic solvents (DES) based on sulfur as alternative lubricants for silicon surfaces

2019-09-11Journal article Restricted access
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dc.contributor.authorAntunes, Mónica
dc.contributor.authorCampinhas, Anne-Sophie
dc.contributor.authorFreire, Mariana de Sá
dc.contributor.authorCaetano, Fernando J. P.
dc.contributor.authorDiogo, Herminio
dc.contributor.authorColaço, Rogério
dc.contributor.authorBranco, Luís C.
dc.contributor.authorSaramago, Benilde
dc.date.accessioned2019-11-04T15:13:05Z
dc.date.available2019-11-04T15:13:05Z
dc.date.issued2019-09-11
dc.description.abstractDeep eutectic mixtures composed of hydrogen-bond donors (HBDs) and hydrogen-bond acceptors (HBAs), the so-called DESs, have recently being proposed as possible “green” alternatives to mineral oils and ionic liquids (ILs) in the lubrication of steel surfaces. DESs have similar physical properties to ILs but have the advantage of being cheaper and easier to prepare. In this work, new DESs containing sulfur units in their composition were prepared and tested in the lubrication of silicon surfaces which are relevant for nano/microelectromechanical systems (NEMS/MEMS). The following new DESs were prepared: ethyldibutyl sulfonium ethylsulfate: polyethylene glycol ([S4,4,2][EtSO4]:PEG), 1-ethyl-tetrahydrothiophenium ethylsulfate: polyethylene glycol ([C2-THT][EtSO4]:PEG), 1-ethyl-3-methylimidazolium (S)-camphorsulfonate: polyethylene glycol ([C2MIM][(S)CSA]:PEG), and 1-methyl-3-picolinium methyl sulfate: polyethylene glycol ([C1-3-pic][MeSO4]:PEG). Other DES, already reported, were tested for comparison purposes: tetrabutylammonium bromide: sulfolane ([N4,4,4,4][Br]:Sulf), choline chloride: polyethylene glycol (ChCl:PEG), and tetrabutylammonium bromide: polyethylene glycol ([N4,4,4,4][Br]:PEG). All DESs were characterized in terms of their water content, viscosity, wettability, and tribological properties. The friction coefficients were measured in a nanotribometer using steel spheres against Si surfaces. The new DES prepared from salts based on the sulfur-containing anions showed good tribological performance, but the best results were obtained with [C2MIM][(S)-CSA]:PEG and [C1-3-pic][MeSO4]:PEG which reduced the friction coefficients to values <0.1, typical of excellent lubrication conditions.pt_PT
dc.description.sponsorshipThis research was funded by the projects UID/QUI/00100/2013, UID/QUI/50006/2013, UID/NAN/50024/2013 and PEst-C/LA0006/2013. L. C. Branco thanks to financial support of FCT/MCTES (IF/0041/2013/CP1161/CT00).pt_PT
dc.description.sponsorshipIF/0041/2013/CP1161/CT00 e PEst-C/LA0006/2013
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.molliq.2019.111728
dc.identifier.urihttp://hdl.handle.net/10400.2/8697
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.subjectDeep eutectic solventspt_PT
dc.subjectLubricantspt_PT
dc.subjectSiliconpt_PT
dc.subjectFriction coefficientpt_PT
dc.subjectPolyethylene glycolpt_PT
dc.titleDeep eutectic solvents (DES) based on sulfur as alternative lubricants for silicon surfacespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FQUI%2F00100%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FQUI%2F50006%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FNAN%2F50024%2F2013/PT
oaire.citation.startPage111728pt_PT
oaire.citation.titleJournal of Molecular Liquidspt_PT
oaire.citation.volume295pt_PT
oaire.fundingStream5876
oaire.fundingStream5876
oaire.fundingStream5876
person.familyNameCaetano
person.familyNameDiogo
person.familyNameSaramago
person.givenNameFernando J. P.
person.givenNameHerminio
person.givenNameBenilde
person.identifier.ciencia-idDE17-708E-317F
person.identifier.ciencia-id6613-74F0-0CC2
person.identifier.ciencia-id3E1B-CD88-4E37
person.identifier.orcid0000-0002-6821-1694
person.identifier.orcid0000-0002-0808-1306
person.identifier.orcid0000-0002-8968-4781
person.identifier.ridH-8246-2012
person.identifier.ridA-4882-2012
person.identifier.scopus-author-id7004474824
person.identifier.scopus-author-id6603795027
person.identifier.scopus-author-id8947275100
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
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