FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W104964938> ?p ?o ?g. }

• W104964938 abstract "Sol-gel derived microporous silica membranes have shown unprecedented hydrogen gas selectivities in dry atmospheres; however their performance is reduced in humid conditions due insufficient material stability. To deal with this issue, one of the strategies is to incorporate hydrocarbons (either as a bridge or at terminals) in the silica matrix. However, the possibility of utilizing bridged-hydrocarbons in silica system i.e. hybrid silica, has not been studied in detail for molecular separations, which was the main focus of this research. The synthesis protocol of sol-gel derived microporous hybrid silica [1,2-bis(triethoxysilyls)ethane (BTESE)] membranes was developed and the effect of dip-sol rheology on the selective layer thickness and membrane performance was studied in detail. The understanding of sol synthesis and membrane fabrication was further investigated by reducing the acid contents (by a factor 15) during sol synthesis in order to enhance the performance of BTESE membranes. The newly developed BTESE membranes were found nitrogen impermeable, i.e. the pore size and structure of these membranes was smaller than nitrogen gas (below 0.36 nm). Doping of elements and metal ions in hybrid silica matrix was performed with the aim to further improve the stability and permselectivity (permeance and selectivity) of these membranes. It was observed that element doping in BTESE matrix resulted in enhanced fluxes of all the observed gases (He, H2, CO2, N2, CH4, and SF6) with no improvement in the hydrogen permselectivities when compared with undoped BTESE membranes. That triggered us to develop another hybrid silica precursor (N,N,N`,N`- (tetrakis-(3-(triethoxysilyl)propyl) malonamide [TTPMA]; in co-operation with IMS-UT), in which metals and ions can be easily and homogenously dispersed, resulting in membranes with enhanced hydrogen separation index. Two ions Ce and Ni were doped in the TTPMA matrix, and like BTESE, molecular sieving phenomena was observed in Ce-TTPMA membranes while Ni-TTPMA membranes were also found nitrogen impermeable confirming a more constricted pore microstructure of these membranes. An attempt to develop a mesoporous hybrid silica structure as an alternative to traditional mesoporous γ-Al2O3, which degrades fast at low pH systems, was made and it was figured out that the hybrid sol was penetrated inside the macroporous α-Al2O3 membrane supports. Either an increase in size of hybrid silica sol particles up to about 40 nm, or the use of a viscosity modifier can be a way to prevent sol infiltration and developing a smooth mesoporous hybrid silica surface on macroporous alumina supports." @default.
• W104964938 created "2016-06-24" @default.
• W104964938 creator A5050675975 @default.
• W104964938 date "2014-05-14" @default.
• W104964938 modified "2023-10-01" @default.
• W104964938 title "Orchestrating pore structure of hybrid silica membranes for molecular separations" @default.
• W104964938 doi "https://doi.org/10.3990/1.9789036536882" @default.
• W104964938 hasPublicationYear "2014" @default.
• W104964938 type Work @default.
• W104964938 sameAs 104964938 @default.
• W104964938 citedByCount "0" @default.
• W104964938 crossrefType "dissertation" @default.
• W104964938 hasAuthorship W104964938A5050675975 @default.
• W104964938 hasBestOaLocation W1049649381 @default.
• W104964938 hasConcept C118792377 @default.
• W104964938 hasConcept C127413603 @default.
• W104964938 hasConcept C159985019 @default.
• W104964938 hasConcept C161790260 @default.
• W104964938 hasConcept C178790620 @default.
• W104964938 hasConcept C18411161 @default.
• W104964938 hasConcept C185592680 @default.
• W104964938 hasConcept C192562407 @default.
• W104964938 hasConcept C21535326 @default.
• W104964938 hasConcept C41625074 @default.
• W104964938 hasConcept C42360764 @default.
• W104964938 hasConcept C49040817 @default.
• W104964938 hasConcept C50670333 @default.
• W104964938 hasConcept C512968161 @default.
• W104964938 hasConcept C55493867 @default.
• W104964938 hasConcept C57863236 @default.
• W104964938 hasConcept C86381522 @default.
• W104964938 hasConceptScore W104964938C118792377 @default.
• W104964938 hasConceptScore W104964938C127413603 @default.
• W104964938 hasConceptScore W104964938C159985019 @default.
• W104964938 hasConceptScore W104964938C161790260 @default.
• W104964938 hasConceptScore W104964938C178790620 @default.
• W104964938 hasConceptScore W104964938C18411161 @default.
• W104964938 hasConceptScore W104964938C185592680 @default.
• W104964938 hasConceptScore W104964938C192562407 @default.
• W104964938 hasConceptScore W104964938C21535326 @default.
• W104964938 hasConceptScore W104964938C41625074 @default.
• W104964938 hasConceptScore W104964938C42360764 @default.
• W104964938 hasConceptScore W104964938C49040817 @default.
• W104964938 hasConceptScore W104964938C50670333 @default.
• W104964938 hasConceptScore W104964938C512968161 @default.
• W104964938 hasConceptScore W104964938C55493867 @default.
• W104964938 hasConceptScore W104964938C57863236 @default.
• W104964938 hasConceptScore W104964938C86381522 @default.
• W104964938 hasLocation W1049649381 @default.
• W104964938 hasOpenAccess W104964938 @default.
• W104964938 hasPrimaryLocation W1049649381 @default.
• W104964938 hasRelatedWork W2039072643 @default.
• W104964938 hasRelatedWork W2109918984 @default.
• W104964938 hasRelatedWork W2391689572 @default.
• W104964938 hasRelatedWork W2877478543 @default.
• W104964938 hasRelatedWork W2884063146 @default.
• W104964938 hasRelatedWork W3014413431 @default.
• W104964938 hasRelatedWork W3041132159 @default.
• W104964938 hasRelatedWork W3207714835 @default.
• W104964938 hasRelatedWork W4291221980 @default.
• W104964938 hasRelatedWork W4309723992 @default.
• W104964938 isParatext "false" @default.
• W104964938 isRetracted "false" @default.
• W104964938 magId "104964938" @default.
• W104964938 workType "dissertation" @default.