Publication:
Monolithic composites of silica aerogels by reactive supercritical deposition of hydroxy-terminated poly(dimethylsiloxane)

dc.contributor.departmentDepartment of Chemical and Biological Engineering
dc.contributor.departmentGraduate School of Sciences and Engineering
dc.contributor.departmentKUTEM (Koç University Tüpraş Energy Center)
dc.contributor.kuauthorErkey, Can
dc.contributor.kuauthorŞanlı, Deniz
dc.contributor.schoolcollegeinstituteCollege of Engineering
dc.contributor.schoolcollegeinstituteGRADUATE SCHOOL OF SCIENCES AND ENGINEERING
dc.contributor.schoolcollegeinstituteResearch Center
dc.date.accessioned2024-11-09T23:00:27Z
dc.date.issued2013
dc.description.abstractMonolithic composites of silica aerogels with hydroxyl-terminated poly(dimethylsiloxane) (PDMS(OH)) were developed with a novel reactive supercritical deposition technique. the method involves dissolution of PDMS(OH) in supercritical CO2 (scCO(2)) and then exposure of the aerogel samples to this single phase mixture of PDMS(OH)-CO2. the demixing pressures of the PDMS(OH)-CO2 binary mixtures determined in this study indicated that PDMS(OH) forms miscible mixtures with CO2 at a wide composition range at easily accessible pressures. Upon supercritical deposition, the polymer molecules were discovered to react with the hydroxyl groups on the silica aerogel surface and form a conformal coating on the surface. the chemical attachment of the polymer molecules on the aerogel surface were verified by prolonged extraction with pure scCO(2), simultaneous deposition with superhydrophobic and hydrophilic silica aerogel samples and aTR-FTIR analysis. all of the deposited silica aerogel samples were obtained as monoliths and retained their transparency up to around 30 wt % of mass uptake. PDMS(OH) molecules were found to penetrate all the way to the center of the monoliths and were distributed homogenously throughout the cylindrical aerogel samples. Polymer loadings as high as 75.4 wt % of the aerogel mass could be attained. It was shown that the polymer uptake increases with increasing exposure time, As well as the initial polymer concentration in the vessel.
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.indexedbyPubMed
dc.description.issue22
dc.description.openaccessNO
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuEU
dc.description.sponsorshipNanO-inSULaTE
dc.description.sponsorshipEU [260086] We acknowledge the Financial Support of the NanO-inSULaTE (Development of Nanotechnology-based High-performance Opaque and Transparent insulation Systems for Energy-efficient Buildings) being funded by the EU Program EeB.NMP.2010-1 under grant agreement no. (260086).
dc.description.volume5
dc.identifier.doi10.1021/am403200d
dc.identifier.issn1944-8244
dc.identifier.quartileQ1
dc.identifier.scopus2-s2.0-84889253510
dc.identifier.urihttps://doi.org/10.1021/am403200d
dc.identifier.urihttps://hdl.handle.net/20.500.14288/8065
dc.identifier.wos327812300032
dc.keywordsSilica aerogel
dc.keywordsPDMS(OH)
dc.keywordsDemixing pressure
dc.keywordsSupercritical deposition
dc.keywordsSurface modification
dc.language.isoeng
dc.publisheramer Chemical Soc
dc.relation.ispartofAcs applied Materials and Interfaces
dc.subjectNanoscience
dc.subjectNanotechnology
dc.subjectMaterials sciences
dc.subjectMultidisciplinary design optimization
dc.titleMonolithic composites of silica aerogels by reactive supercritical deposition of hydroxy-terminated poly(dimethylsiloxane)
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.kuauthorŞanlı, Deniz
local.contributor.kuauthorErkey, Can
local.publication.orgunit1GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
local.publication.orgunit1College of Engineering
local.publication.orgunit1Research Center
local.publication.orgunit2Department of Chemical and Biological Engineering
local.publication.orgunit2KUTEM (Koç University Tüpraş Energy Center)
local.publication.orgunit2Graduate School of Sciences and Engineering
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