A FT-IR Study of the Hydrolysis of Tetraethylorthosilicate (TEOS).

Rubio, F.; Rubio, J.; Oteo, J. L.

doi:10.1080/00387019808006772

Cited by 298 publications

(237 citation statements)

References 18 publications

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“…The marked bands at 1168 cm −1 (faint shoulder), 1127 cm −1 and 1038 cm −1 are attributed to the non-hydrolyzed ethyl silicate groups (Si-O-C) and the condensed silica (Si-O-Si), respectively. The band at 970 cm −1 is attributed to silanol (Si-OH) groups and the Si-O − free broken bonds [20]. The broad band at 3200-3600 cm −1 and the faint peaks at 1400-1800 cm −1 could be associated with the residual OH − groups and the water/humidity effect.…”

Section: Ftir Analysismentioning

confidence: 99%

“…11a,b). According to the literature [5,20], during the evolution of the polymerization process the methyl/ethyl groups (C-H) tend to disappear (in particular there is a reduction of the intensity of C-H stretching around 2900 cm −1 and almost disappearance of the related bands in the area between 1200 and 1500 cm −1 ), while there is an increase in the intensity of Si-O-Si groups (corresponding to the silica gel formed) and the consequent intensity increase of Si-O between 1035 and 1080 cm −1 . Similarly, in stone samples (Fig.…”

Section: Ftir Analysismentioning

confidence: 99%

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Modification of water transport properties of porous building stones caused by polymerization of silicon-based consolidation products

Karatasios

Michalopoulou

Amenta

et al. 2017

Pure and Applied Chemistry

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This work studies the polymerization process of four different commercially available silicon-based polymers and their consequent effect on surface tension and water transport properties of natural stones used in architectural monuments, essential for modeling and predicting the durability of natural stones against weathering action of aqueous solutions. The four products studied consisted of two ethyl-silicate based materials, an alkyl-alkoxy siloxane oligomer with hydrophobic agents and finally, a silane/siloxane emulsion. In all cases, the morphology of the amorphous material deposited into the pore network of stones was examined by electron microscopy (SEM). The polymerization process was studied by infrared spectroscopy (FTIR) on both inert surface and porous stone substrate. The treated stone specimens were further tested after polymerization in terms of determination and comparison of water absorption coefficient, open porosity, pore size distribution (mercury intrusion porosimetry) and surface tension (contact angle measurements) properties. According to the analysis, the modification of the wetting properties of the stone surface should be related rather with the chemistry than the microstructure of the xerogels alone.

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Section: Ftir Analysismentioning

confidence: 99%

Section: Ftir Analysismentioning

confidence: 99%

Modification of water transport properties of porous building stones caused by polymerization of silicon-based consolidation products

Karatasios

Michalopoulou

Amenta

et al. 2017

Pure and Applied Chemistry

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“…According to the literature, those differences indicate some variations in the geometry and size of the siloxane condensed species [34,35], which are dependent on the sol-gel experimental parameters [36] and on the type of metal introduced into the system [35].…”

Section: Ft-ir Analysismentioning

confidence: 99%

PDMS-SiO2-TiO2-CaO hybrid materials – Cytocompatibility and nanoscale surface features

Almeida

Wacha

Gomes

et al. 2016

Materials Science and Engineering: C

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Two biocompatible PDMS-SiO 2 -TiO 2 -CaO porous hybrid materials were prepared using the same base composition, precursors, and solvents, but following two different sol-gel procedures, based on the authors' previous works where for the first time, in this hybrid system, calcium acetate was used as calcium source. The two different procedures resulted in monolithic materials with different structures, microstructures, and surface wettability. Even though both are highly hydrophobic (contact angles of 127.2° and 150.6°), and present different filling regimes due to different surface topographies, they have demonstrated to be biocompatible when tested with human osteoblastic cells, against the accepted idea that high-hydrophobic surfaces are not suitable to cell adhesion and proliferation. At the nanoscale, the existence of hydrophilic silica domains containing calcium, where water molecules are physisorbed, is assumed to support this capability, as discussed.

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“…That is followed by polymerisation of the silanol groups to form siloxanes, a process in which water is released (2) [10,14]. While polymerisation takes place more quickly at high humidity and temperature, greater hardening is attained at low humidity [14].…”

Section: Introductionmentioning

confidence: 99%

“…Tetraethoxysilane (TEOS), which polymerises via hydrolysis to yield siloxane, a silicabased polymer, [3,10] is a consolidant frequently used to restore various stone materials [5,11]. Hybrid or modified TEOS-based consolidants have been developed to enhance its properties as primers for the effective protection of steel against corrosion [12] or improve its lack of elasticity which favours the formation of fractures and fissures during the drying stage [13], etc.…”

Section: Introductionmentioning

confidence: 99%

Interaction of TEOS with cementitious materials: Chemical and physical effects

Barberena-Fernández

Carmona-Quiroga

Blanco-Varela

2015

Cement and Concrete Composites

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This study explored the effectiveness of tetraethyl orthosilicate (TEOS) as a Portland cement mortar consolidant to verify whether it meets the requirements for use in cultural assets. TEOS was found to raise cement mortar strength, lower its porosity and permeability and occasion minimal alteration in its appearance, an indication of its suitability to conserve heritage mortar works.FTIR and 29 Si MAS NMR studies supported the notion that TEOS interacts with the hydrated phases of the cement, portlandite and C-S-H gel. The reaction product between portlandite and TEOS was C-S-H gel and between TEOS and C-S-H gel was a gel with longer chain.

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A FT-IR Study of the Hydrolysis of Tetraethylorthosilicate (TEOS).

Cited by 298 publications

References 18 publications

Modification of water transport properties of porous building stones caused by polymerization of silicon-based consolidation products

Modification of water transport properties of porous building stones caused by polymerization of silicon-based consolidation products

PDMS-SiO2-TiO2-CaO hybrid materials – Cytocompatibility and nanoscale surface features

Interaction of TEOS with cementitious materials: Chemical and physical effects

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