Adsorption of triethylamine and water vapor and the modification of silica surface by gaseous trimethylchlorosilane

Киселев, А. В.; Kuznetsov, Boris; Lanin, S. N.

doi:10.1016/0021-9797(79)90089-4

Cited by 30 publications

(13 citation statements)

References 9 publications

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“…The usual value of σ N 2 ) 0.162 nm 2 was taken as the crosssectional area of a nitrogen molecule, and the cross-sectional area of the neopentane molecule was calculated as σ neo ) 0.614 nm 2 from the monolayer capacity on unmodified samples. 18,19 The specific surface areas obtained from nitrogen adsorption were calculated by two methods. One method is the specific surface area S BET N2 (m 2 ‚g -1 ) calculated by the Brunauer-Emmett-Teller (BET) equation, and the other method is the surface area S G N2 (m 2 ‚g -1 ) calculated where the work of adhesion is equal to that for the unmodified surface based on the Gibbs adsorption equation.…”

Section: Methodsmentioning

confidence: 99%

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Surface Geometric Structure of Chemically Modified Silica Studied by Direct Atomic Force Microscopy (AFM) Imaging and Adsorption Method

et al. 2000

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The relationship between wettability and surface geometric structure of modified silica particles and glass plates was investigated. Surface modification was performed by the autoclave method with 1-dodecanol to control the surface wettability. The preferential dispersion test proved that wettability varied at a surface modification ratio of 20%, which coincided with the changing point of the geometric structure of modifier chains determined by the adsorption method. The geometric structure was also evaluated by atomic force microscopy (AFM), and we could obtain the hexagonal packing of chains of the modifiers both in water and air at high surface modification ratio. Imaging of the surface of the nanosized particles on a glass plate was accomplished in water by taking advantage of the hydrophobic attractive force, which was proved by adhesion force measurements.

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Section: Methodsmentioning

confidence: 99%

“…The saturation vapor pressure of neopentane was taken as 532.28 Torr. The usual value of σ N 2 = 0.162 nm 2 was taken as the cross-sectional area of a nitrogen molecule, and the cross-sectional area of the neopentane molecule was calculated as σ neo = 0.614 nm 2 from the monolayer capacity on unmodified samples. , …”

Section: Methodsmentioning

confidence: 99%

Surface Geometric Structure of Chemically Modified Silica Studied by Direct Atomic Force Microscopy (AFM) Imaging and Adsorption Method

et al. 2000

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“…Moreover, adsorption results from IGC experiments were the same for both grades of silica gel. As a negative control, silica gel was exposed to trimethylsilyl chloride, which reacts with all surface silanols, 24 and then was exposed to LiAlH 4 . The results for this negative control exhibited no pressure change within the uncertainty of the measurement indicating that there were no available surface silanols for reaction with LiAlH 4 .…”

Section: Comparison Of Theoretical and Experimental Surfacesmentioning

confidence: 99%

Binding of Small Molecules to a Silica Surface: Comparing Experimental and Theoretical Results

Taylor

Runge²,

Cory

et al. 2011

J. Phys. Chem. C

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“…The sorption of gases and vapors on silicate glass is also well known (Holland 1964). It has been demonstrated that due to strong hydrogen bonding between the hydroxylated surface of aerosilogel (a synthetic macro-porous silica with a uniform structure of the hydroxylated surface) and polarized 1c RC13-271 is residual sample after vacuum step heating (Sample #5, residual, Table 7) organic molecules (CH 3 COOC 2 H 5 , C 6 H 5 N, (C 2 H 5 ) 3 N), these molecules cannot be desorbed from the aerosilogel by heating at temperatures ranging from 200 to 1100°C under vacuum, followed by pumping (Curthoys et al 1974;Kiselev et al 1979). In other words, the adsorption process is found to be irreversible.…”

Section: Sources Of Modern Carbon Contaminationmentioning

confidence: 99%

Challenges in Radiocarbon Dating Organic Carbon in Opal-Rich Marine Sediments

et al. 2002

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We explored the reliability of radiocarbon ages obtained on organic carbon phases in opal-rich Southern Ocean sediments. Paired biogenic carbonate and total organic carbon (TOC) 14C analyses for three Southern Ocean cores showed that the TOC ages were systematically younger than the carbonate ages. Carbonate ages were consistent with oxygen isotopic and bio-stratigraphy, indicating error in TOC ages that could be explained by 5–24% of modern carbon contamination of TOC samples. Two possible sources of contamination are: 1) adsorption of atmospheric CO2 or volatile organic compounds to reactive opal surface sites, and 2) fixation of atmospheric CO2 by chemosynthetic bacteria during core storage. In an effort to reduce the modern carbon contamination, diatoms were separated from sediments, purified, and pre-oxidized by concentrated nitric and perchloric acids to permit dating of opal-intrinsic organic carbon (~0.1–0.3% by weight). 14C ages of chemically pre-oxidized opal showed a significant amount of modern carbon contamination, from 11 to 32%, indicating adsorption from the atmosphere of modern carbon onto opal surfaces that were previously cleaned by acid oxidation. Several experiments designed to eliminate the modern C contamination were attempted, but so far we have not been able to obtain a radiocarbon age on 14C-dead Southern Ocean opal-rich sediments, either bulk TOC or purified diatom opal samples, as old as our procedural blank.

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Adsorption of triethylamine and water vapor and the modification of silica surface by gaseous trimethylchlorosilane

Cited by 30 publications

References 9 publications

Surface Geometric Structure of Chemically Modified Silica Studied by Direct Atomic Force Microscopy (AFM) Imaging and Adsorption Method

Surface Geometric Structure of Chemically Modified Silica Studied by Direct Atomic Force Microscopy (AFM) Imaging and Adsorption Method

Binding of Small Molecules to a Silica Surface: Comparing Experimental and Theoretical Results

Challenges in Radiocarbon Dating Organic Carbon in Opal-Rich Marine Sediments

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