Deposition of SiO2 films from novel alkoxysilane/O2 plasmas

Bogart, K. H. A.; Ramirez, S. K.; Gonzales, L. A.; Bogart, Gregory R.; Fisher, Ellen R.

doi:10.1116/1.581517

Cited by 35 publications

(18 citation statements)

References 35 publications

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“…3(b, d)] show peaks resulting from Si-CH 3 bonds (1264 cm Ϫ1 ) and Si-O, Si-C, or Si-O-C bonds (774 cm Ϫ1 ). 21 Note that the broad peak at 3337 cm Ϫ1 due to the O-H stretch of the wood components is somewhat reduced in intensity in the spectra of coated specimens. In addition, the weak peaks at 2921 and 2851 cm Ϫ1 caused by the C-H stretch of the wood components have been replaced by sharper and much stronger peaks resulting from the C-H stretch of the long hydrocarbon chain of HDTMOS bound to the wood by the sol-gel process.…”

Section: Resultsmentioning

confidence: 97%

Surface chemistry and moisture sorption properties of wood coated with multifunctional alkoxysilanes by sol‐gel process

Tshabalala

Kingshott

VanLandingham

et al. 2003

J of Applied Polymer Sci

111

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Sol-gel surface deposition of a hydrophobic polysiloxane coating on wood was accomplished by using a mixture of a low molecular weight multifunctional alkoxysilane, methyltrimethoxysilane (MTMOS), and a high molecular weight multifunctional alkoxysilane, hexadecyltrimethoxysilane (HDTMOS). Investigation of the surface chemistry and morphology of the wood specimens by means of ATR-FTIR, energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, SEM, and atomic force microscopy indicated that the sol-gel process results in deposition of polysiloxane networks that are bonded to the wood by polycondensation with surface hydroxyl groups. The surface hydroxyl groups involved in the bonds appear to be located predominantly on the cellulose component of the wood. The sol-gel deposit on the wood substrates lowered the rates of water and water vapor sorption. The low molecular weight MTMOS apparently penetrated the outer surface layers of the wood and condensed with hydroxyls that may not be readily accessible to the high molecular weight HDTMOS. Once attached to such sites, it is reasonable to assume that some of these surface derivatives of MTMOS condensed with other molecules of MTMOS and HDTMOS with a long hydrocarbon chain to form a polysiloxane network that is hydrophobic. The ultimate effect of the sol-gel deposit can therefore be regarded as not only to decrease the surface concentration of hydrogen-bonding sites, but also to stereochemically hinder the formation of hydrogen bonds between such sites and water molecules.

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Section: Resultsmentioning

confidence: 97%

Surface chemistry and moisture sorption properties of wood coated with multifunctional alkoxysilanes by sol‐gel process

Tshabalala

Kingshott

VanLandingham

et al. 2003

J of Applied Polymer Sci

111

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“…Also in the case of HMTW-coated specimens, the band at 1724 cm -1 was absent, indicating hemicellulose degradation induced by treatment with TiO2. The HMW-coated specimens on the other hand showed an additional band at 775 cm -1 (marked with an arrow), which was tentatively assigned to Si-O, Si-C or Si-O-C bonds (Bogart et al 1998), indicating the presence of the alkoxysilane deposit.…”

Section: Water Repellent Propertiesmentioning

confidence: 97%

Weathering Performance of Wood Coated with a Combination of Alkoxysilanes and Rutile TiO2 Heirarchical Nanostructures

Zheng¹,

Tshabalala²,

Li³

et al. 2015

BioResources

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The weathering performance of wood coated with a combination of rutile TiO2 hierarchical nanostructures and a sol-gel deposit of alkoxysilanes was determined by exposing three sets of specimens to UV light and water spray. The first set consisted of specimens coated with a mixture of methyltrimethoxysilane (MTMOS) and hexadecyltrimethoxysilane (HDTMOS). The second set consisted of specimens coated with nanostructural TiO2 followed by a mixture of MTMOS and HDTMOS. The third set consisted of uncoated control specimens. The wood coated with TiO2 followed by a mixture of MTDMOS and HDTMOS exhibited significantly less surface color change and weight loss as a result of UV lightinduced degradation and erosion from water spray in comparison with the other groups. However, the coated surfaces were gradually transformed from hydrophobic to hydrophilic. Despite this apparent weakness, the MTMOS/HDTMOS/TiO2 coating, with superior photostabilization properties and resistance to surface erosion, may be useful for improving the weathering performance of wood coated with semi-transparent wood stains.

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“…To the right, we see a sharp medium-height peak of 1654 cm −1 in regards to the scissoring vibration of the N-H bond. The group of peaks at 1451-1388 cm −1 , medium and sharp in shape, corresponds to the asymmetric and symmetric stretches of C-H bonds in -CH 2groups [50,51], along with stretching vibration of C-F in the -CF 2 -CF 3 groups [52][53][54]. The small peak at 1270 cm −1 is a result of the Si-C vibrations in the Si-CH 3 group and the shoulder at 1194 cm −1 indicates the presence of C-F bonds corresponding to the stretches of >CF 2 bonds [54][55][56][57][58].…”

Section: Characterisation Of the Teos-fas Sol And Coatingmentioning

confidence: 99%

TEOS-Based Superhydrophobic Coating for the Protection of Stone-Built Cultural Heritage

et al. 2021

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Tetraethyl orthosilicate (TEOS) is extensively used in the conservation of stone-built cultural heritage, which is often subjected to water-induced degradation processes. The goal of this study was to produce and study a TEOS-based material with the ability to repel liquid water. A sol solution of TEOS and 1H,1H,2H,2H-perfluorooctyl triethoxysilane (FAS) was prepared and deposited on marble. The static contact angles (CAs) of water drops on the coated marble surface were >170° and the sliding angles (SA) were <5°, suggesting that superhydrophobicity and water repellency were achieved on the surface of the synthesized TEOS-based coating. FTIR and SEM-EDS were employed to characterize the produced coating. The latter offered good protection against water penetration by capillarity, reducing the breathability of marble only by a small extent and with practically no effect on its aesthetic appearance. The durability of the coating was evaluated through various tests that provided very promising results. Finally, the versatility of the method was demonstrated as the TEOS-based coating was successfully deposited onto glass, brass, wood, silicon, paper and silk, which obtained extreme wetting properties.

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Deposition of SiO2 films from novel alkoxysilane/O2 plasmas

Cited by 35 publications

References 35 publications

Surface chemistry and moisture sorption properties of wood coated with multifunctional alkoxysilanes by sol‐gel process

Surface chemistry and moisture sorption properties of wood coated with multifunctional alkoxysilanes by sol‐gel process

Weathering Performance of Wood Coated with a Combination of Alkoxysilanes and Rutile TiO2 Heirarchical Nanostructures

TEOS-Based Superhydrophobic Coating for the Protection of Stone-Built Cultural Heritage

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