Infrared study of the sorption of HSiCl3 on silica and the stability of the chemisorbed layers

Low, M. J. D.; Severdia, A. G.; Chan, Jo Myung

doi:10.1016/0021-9797(82)90046-7

Cited by 23 publications

(11 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Trichlorosilane (HSiCl 3 ), methyldichlorosilane (HSiCl 2 CH 3 ), or dimethylchlorosilane [HSiCl(CH 3 ) 2 ] have been used for that purpose (Scheme ). − The adsorption is usually performed in the gas phase and proceeds by exchange with the hydroxyl groups of silica. The number of ligands exchanged with hydroxyl groups depends on the structure of the silane, i.e., the number and type of ligands (Scheme b), and the hydride-related stretching vibration is displaced accordingly .…”

Section: Supported Metal Hydrides Prepared Via Surface Organometallic...mentioning

confidence: 99%

Isolated Surface Hydrides: Formation, Structure, and Reactivity

et al. 2016

View full text Add to dashboard Cite

Surface hydrides are ubiquitous in catalysis. However, their structures and properties are not as well-understood as those of their molecular counterparts, which have been extensively studied for the past 70 years. Hydrides isolated on surfaces have been characterized as stable entities on oxide surfaces or in zeolites. They have also been proposed as reaction intermediates in numerous catalytic processes (hydrogenation, hydrogenolysis, etc.). They have also been prepared via surface organometallic chemistry. In this review, we describe their key structural features and spectroscopic signatures. We discuss their reactivity and stability and also point out unexplored areas.

show abstract

Section: Supported Metal Hydrides Prepared Via Surface Organometallic...mentioning

confidence: 99%

Isolated Surface Hydrides: Formation, Structure, and Reactivity

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Similar surface species were also observed upon chemisorption of trichlorosilane on silica, followed by a vacuum treatment at 650 °C . Later work on the water-vapor treatment of Si–Cl species and pyrolysis of trimethylsiloxylated silica also describes the generation of surfaces, which differ by the structure of the reactive groups. − These species activate some small molecules, e.g., dioxygen, methane, and carbon monoxide, as well as initiate polymerization of olefins. ,, In addition to surface chemistry studies, the role of reactive species was recognized within the field of microelectronics. The formation of defects in a silica gate within a metal oxide semiconductor causes dielectric breakdown and 1/f noise …”

Section: Introductionmentioning

confidence: 78%

Fully Dehydroxylated Silica Generated from Hydrosilane: Surface Defects and Reactivity

2019

View full text Add to dashboard Cite

A silanol-free silica with high surface area was prepared by postfunctionalization of silica by means of sol–gel reaction with triethoxysilane followed by a high-temperature dehydroxylation treatment. Besides the absence of surface silanols, paramagnetic and diamagnetic defect sites are generated according to UV–vis, electron paramagnetic resonance (EPR), and reactivity studies. The diamagnetic defects are assigned to oxygen-deficient Si centers (silylenes), which exhibit a distinct UV–vis signature and reactivity. The paramagnetic defects are attributed to silicon-centered radicals that display particularly high g values in EPR compared to reports of commonly described silicon radicals in silica (E’ sites), suggesting the presence of a silicon atom in its proximity. These defect sites are highly reactive and generate dihydrosilane, a silane radical, a peroxyl radical, and methylsiloxane upon reaction with dihydrogen, dioxygen, and methane, respectively.

show abstract

“…The chemical structure of PHPS is shown in Scheme . PHPS is easily converted into silica at low temperatures under steam unlike other silica precursors, such as orthosilicate and polyhedral oligomeric silsesquioxanes . PHPS is soluble in many organic solvents such as chloroform, toluene, and xylene.…”

Section: Introductionmentioning

confidence: 99%

Transparency and water vapor barrier properties of polybenzoxazine‐silica nanocomposites provided with perhydropolysilazane

Lee

Saito

2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly[6,6′‐(1‐methylethylidene)bis(3,4‐dihydro‐3‐2H‐1,3‐hexylbenzoxazine)] (PB‐hda)‐silica nanocomposites were synthesized with perhydropolysilazane (PHPS) and PB‐hda by ring opening polymerization in one step. Both high transparency and good water vapor barrier property (WVP) are required to be improved in the field of packing and electronic materials, such as OLED, solar cell, and electronic paper. PB‐hda has shown high toughness and high thermal stability. However, it became dark brown and showed a reduction of WVP with increasing curing temperature, which make it difficult to be applied to packing and electronic materials. In this study, we aim to improve transparency and WVP by addition of PHPS into PB‐hda matrix. It was found that nanocomposites showed the improvement of WVP and transparency owing to SiOC linkages between PB‐hda and PHPS. In particular, a nanocomposite with 1 wt % of silica showed the most significant improvement in terms of transparency and the WVP. These properties were found to be influenced by the thickness of the combined polymer‐silica layers that formed around the silica particles; these layers were thickest in the 1 wt % sample. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44238.

show abstract

Infrared study of the sorption of HSiCl3 on silica and the stability of the chemisorbed layers

Cited by 23 publications

References 10 publications

Isolated Surface Hydrides: Formation, Structure, and Reactivity

Isolated Surface Hydrides: Formation, Structure, and Reactivity

Fully Dehydroxylated Silica Generated from Hydrosilane: Surface Defects and Reactivity

Transparency and water vapor barrier properties of polybenzoxazine‐silica nanocomposites provided with perhydropolysilazane

Contact Info

Product

Resources

About