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Deep Eutectic Solvents (DES) based on sulphur for silicon surfaces as alternative lubricants

2019-06-24Conference object Open access
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dc.contributor.authorAntunes, Mónica
dc.contributor.authorMartins, Anne-Sophie
dc.contributor.authorFreire, Mariana de Sá
dc.contributor.authorCaetano, Fernando J. P.
dc.contributor.authorDiogo, Herminio
dc.contributor.authorColaco, Rogério
dc.contributor.authorBranco, Luís C.
dc.contributor.authorSaramago, Benilde
dc.date.accessioned2019-12-03T16:52:56Z
dc.date.available2019-12-03T16:52:56Z
dc.date.issued2019-06-24
dc.descriptionEncontro realizado na Universidade Nova de Lisboa de 24-27 de junho de 2019.pt_PT
dc.description.abstractDeep eutectic mixtures composed of hydrogen-bond donors and hydrogen-bond acceptors, 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 sulphur units in their structure 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: dibutil-ethyl sulfonium ethylsulfate: polyethylene glycol ([S4,4,2][EtSO4]:PEG), ethyl-tetrahydrothiophenium ethylsulfate: polyethylene glycol ([C2-THT][EtSO4]:PEG, cis-1-ethyl-3methylimidazolium canforsulfonate: polyethylene glycol ([C2MIM][(S)-CSA]:PEG), and 1,3-dimethylpiridinium methyl sulfate: polyethylene glycol ([C1-3-pic][MeSO4]:PEG). Other DES, already known, were tested for comparison purposes: tetrabutylammonium bromide: ‎tetrahydrothiophene 1,1-dioxide ([N4,4,4,4][Br]:Sulfolane), 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 ILs 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.sponsorshipFundação para a Ciência e a Tecnologia (FCT-Portugal) and COMPETE (FEDER), within projects UID/QUI/00100/2013, UID/NAN/50024/2013 and PTDC/CTM-POL/3698/2014pt_PT
dc.description.versioninfo:eu-repo/semantics/draftpt_PT
dc.identifier.citationAntunes, Mónica; et al. - Deep Eutectic Solvents (DES) based on sulphur for silicon surfaces as alternative lubricants. In International Meeting on Deep Eutectic Systems, 1, 2019, Lisboa - "International meeting..."[Em linha]. [S.l.]: [s.n.], 2019. 1 posterpt_PT
dc.identifier.urihttp://hdl.handle.net/10400.2/8848
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationHierarchical nanomaterials for structural color
dc.relation.publisherversionhttps://eventos.fct.unl.pt/desmeeting2019/pages/welcomept_PT
dc.subjectDeep eutectic solventspt_PT
dc.subjectAlternative lubricantspt_PT
dc.subjectFriction coefficientpt_PT
dc.subjectSiliconpt_PT
dc.titleDeep Eutectic Solvents (DES) based on sulphur for silicon surfaces as alternative lubricantspt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleHierarchical nanomaterials for structural color
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FQUI%2F00100%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FNAN%2F50024%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTM-POL%2F3698%2F2014/PT
oaire.citation.conferencePlaceUniversidade Nova de Lisboapt_PT
oaire.fundingStream5876
oaire.fundingStream5876
oaire.fundingStream3599-PPCDT
person.familyNameCaetano
person.familyNameDiogo
person.familyNameColaco
person.familyNameSaramago
person.givenNameFernando J. P.
person.givenNameHerminio
person.givenNameRogério
person.givenNameBenilde
person.identifier.ciencia-idDE17-708E-317F
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person.identifier.orcid0000-0002-6821-1694
person.identifier.orcid0000-0002-0808-1306
person.identifier.orcid0000-0002-5529-1621
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-id6701406502
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.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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