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dc.contributor.authorNg, Serina
dc.contributor.authorJelle, Bjørn Petter
dc.contributor.authorSandberg, Linn Ingunn
dc.contributor.authorGao, Tao
dc.contributor.authorAlex Mofid, Sohrab
dc.date.accessioned2018-04-23T06:47:25Z
dc.date.available2018-04-23T06:47:25Z
dc.date.created2018-01-08T11:09:42Z
dc.date.issued2018
dc.identifier.citationConstruction and Building Materials. 2018, 166 72-80.nb_NO
dc.identifier.issn0950-0618
dc.identifier.urihttp://hdl.handle.net/11250/2495381
dc.description.abstractHollow silica nanospheres (HSNS) show a promising potential to become good thermal insulators with low thermal conductivity values for construction purposes. The thermal conductivity of HSNSs is dependent on their structural features such as sizes (inner diameter and shell thickness) and shell structures (porous or dense), which are affected by the synthetic methods and procedures including reaction medium, polystyrene template, and silica precursor. Formation of thermally insulating HSNS was favoured by alkaline reaction, whereby highly porous silica shells were formed, promoting less silica per volume of material, thus a lower solid state thermal conductivity. The Knudsen effect is in general reducing the gas thermal conductivity including the gas and pore wall interaction for materials with pore diameters in the nanometer range, which is also valid for our HSNS reported here. Further decreasing the pore sizes would invoke a higher impact from the Knudsen effect. The additional insulating effect of the inter-silica voids (median diameter D50 ≈ 15 nm) within the shell coating contributed also to the insulating properties of HSNS. The synthesis route with tetraethyl orthosilicate (TEOS) was more robust and produced more porous silica shells than the one with water glass (Na2SiO3, WG), although the latter might represent a greener synthetic method.nb_NO
dc.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleHollow Silica Nanospheres as Thermal Insulation Materials for Construction: Impact of their Morphologies as a Function of Synthesis Pathways and Starting Materialsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber72-80nb_NO
dc.source.volume166nb_NO
dc.source.journalConstruction and Building Materialsnb_NO
dc.identifier.doi10.1016/j.conbuildmat.2018.01.054
dc.identifier.cristin1537492
dc.relation.projectNorges forskningsråd: 193830nb_NO
dc.relation.projectNorges forskningsråd: 250159nb_NO
dc.relation.projectNorges forskningsråd: 245963nb_NO
dc.description.localcode© 2018. This is the authors’ accepted and refereed manuscript to the article. Locked until 22.2.2020 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/nb_NO
cristin.unitcode194,64,91,0
cristin.unitnameInstitutt for bygg- og miljøteknikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.fulltextpostprint
cristin.qualitycode2


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