Influence of the nature of the organic precursor on the textural and chemical properties of silsesquioxane materials

Cerveau, Geneviève; Corriu, Robert J. P.; Lepeytre, Cédric; Mutin, P. Hubert

doi:10.1039/a805794j

Cited by 80 publications

(77 citation statements)

References 14 publications

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“…Monomers that are most likely to form hydrophobic surfaces are the ones with terminating organic groups [37,40,[52][53][54][55][56][57][58][59][60][61] or with long and flexible organic bridges [53,62]. Short or rigid bridges such as ethylene and p-phenylene do not have the length and spatial freedom to ''step out'' to the surface and completely shield the underlying siloxane bonds; thus, these materials keep on having a significant affinity for water [47,48,[62][63][64]. Furthermore, when these materials are used for waterpermeable microporous membranes, their networks explicitly require a significant degree of hydrophilicity.…”

Section: Thermal and Hydrothermal Stabilitymentioning

confidence: 99%

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Elshof

Dral

2015

J Sol-Gel Sci Technol

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Supported microporous organosilica membranes made from bridged silsesquioxane precursors by an acid-catalyzed sol-gel process have demonstrated a remarkable hydrothermal stability in pervaporation and gas separation processes, making them the first generation of ceramic molecular sieving membranes with sufficient performance under industrially relevant conditions. The commercial availability of various a,x-bis(trialkoxysilyl)alkane and 1,4-bis(trialkoxysilyl)benzene precursors facilitates the tailoring of membrane properties like pore size and surface chemistry via the choice of precursor(s) and process variables. Here, we describe the engineering of sols for making supported microporous thin films, discuss the thermal and hydrothermal stability of microporous organosilicas and give a short overview of the developments and applications of these membranes in liquid and gas separation processes since their first report in 2008.Graphical Abstract

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Section: Thermal and Hydrothermal Stabilitymentioning

confidence: 99%

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Elshof

Dral

2015

J Sol-Gel Sci Technol

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“…As condições brandas envolvidas neste processo fornecem uma rota versátil para a preparação desses materiais 2,3 . Os processos químicos básicos para formação de materiais obtidos pelo método sol-gel envolvem a hidrólise do precursor: ≡Si-OR + H 2 O → ≡Si-OH + ROH e subseqüente formação da rede de silício:…”

Section: Oh)unclassified

Fenilsilicato dopado com Eu III obtido pelo método sol-gel

Nassar¹,

Ávila²,

Pereira³

et al. 2007

Quím. Nova

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Recebido em 14/7/06; aceito em 15/2/07; publicado na web em 30/7/07 PHENYLSILICATE DOPED WITH Eu III OBTAINED BY SOL-GEL METHODOLOGY. In this work, we report the synthesis and the photoluminescence features of a Eu(III)-doped modified silica matrix obtained by the sol-gel method. The matrix was prepared by reaction between tetraethylorthosilicate and phenyltriethoxysilane alkoxide. The hydrolysis occurred using basic catalysis. The solids were treated at 100, 200 and 300 o C during 4 h and the structure was determined by thermogravimetric analysis (TG/DTG), nuclear magnetic resonance (NMR 29 Si and 13 C), infrared spectroscopy (IR) and photoluminescence (PL). The PL spectra display the Eu(III) lines characteristic of the ion, 5 D 0 → 7 F J (J=0, 1, 2, 3, 4), the blue emission as ascribed in the silica matrix. The NMR and TG showed the stability of hybrid silica.Keywords: europium III; sol-gel; thermal analysis. INTRODUÇÃOMateriais híbridos obtidos pelo método sol-gel têm sido intensamente investigados nos últimos anos. As vantagens desta técnica baseiam-se na cinética de hidrólise e policondensação que permitem a interferência no sistema, através do pH, temperatura e solvente, oferecendo numerosas possibilidades de fabricação de amostras de sílica porosas e densas a baixas temperaturas e com morfologias controladas 1 . Um bom exemplo é a rota desenvolvida por Stöber, que consiste na preparação de partículas esféricas de sílica através da hidrólise e condensação do alcóxido tetraetilortossilicato, catalisado por uma base (NH 4 OH).O processo sol-gel apresenta a vantagem de levar à formação de materiais híbridos mais homogêneos, além de ser possível, por esta metodologia, uma maior reprodutibilidade na obtenção dos materiais. As condições brandas envolvidas neste processo fornecem uma rota versátil para a preparação desses materiais 2,3 . Os processos químicos básicos para formação de materiais obtidos pelo método sol-gel envolvem a hidrólise do precursor:e subseqüente formação da rede de silício:A habilidade para sintetizar polímeros inorgânicos usando o processo sol-gel com pouco ou nenhum aquecimento torna possí-vel a dopagem destes géis com uma variedade de moléculas orgâ-nicas e organometálicas, especialmente as que apresentam propriedades luminescentes 4 . Materiais óxidos, como a sílica, podem acomodar altas concentrações de dopantes adsorvidos em sua superfí-cie, como os íons metálicos, mantendo uma boa homogeneidade, o que proporciona a formação de matrizes com importantes aplicações. Além disso, a superfície da sílica pode ser modificada com agentes sililantes, os quais podem ser adicionados simultaneamente à preparação da sílica ou, posteriormente, às suas sínteses 5,6 . O processo sol-gel permite também a incorporação de redes de polímeros orgânicos, que levam à formação de materiais híbridos orgânico-inorgânicos 7 . O conceito de nanocompósitos híbridos orgânico-inorgânicos explodiu nos anos 80 com a expansão dos processos químicos inorgânicos mais brandos. Certamente a condição de síntese oferec...

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“…Because of these advantages, BPSs are considered an ideal material as adsorbents [8,9]. Porous BPS materials have been prepared from monomers bearing rigid and short organic bridging groups, including ethane, ethylene, as well as small organic aromatics such as thiophene, xylene and benzene [10]. However, there is little research on BPS materials with long and soft bridges containing –NH 2 or –OH groups, even though such functional groups are expected to contribute to adsorption.…”

Section: Introductionmentioning

confidence: 99%

Pore structure control factors of polyamine-bridged polysilsesquioxanes by sol–gel method and their structure-adsorption properties for Au(III)

Jin

Sun

et al. 2018

Science and Technology of Advanced Materials

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A series of bridged polysilsesquioxane (BPS) materials was synthesized by the sol–gel method from 3-chloropropyl trimethoxysilane, diethylenetriamine (DETA) or ethylenediamine. Tetraethyl orthosilicate (TEOS) and/or one of the two templates, hexadecyl trimethyl ammonium bromide (CTAB) or P123, were used in the co-condensation process to construct some of the porous adsorbents. The adsorption of Au(III) was the highest for samples without TEOS, especially for the DETA series with CTAB template. This study elucidates the synthesis and applications of BPS materials.

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Influence of the nature of the organic precursor on the textural and chemical properties of silsesquioxane materials

Cited by 80 publications

References 14 publications

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Fenilsilicato dopado com Eu III obtido pelo método sol-gel

Pore structure control factors of polyamine-bridged polysilsesquioxanes by sol–gel method and their structure-adsorption properties for Au(III)

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