A procedure for determining the concentration of Hydroxyl Groups on Silica Surfaces

Madeley, J. D.; Richmond, Robert C.

doi:10.1002/zaac.19723890112

Cited by 29 publications

(9 citation statements)

References 11 publications

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“…Rather large samples were needed. Extinction at 2500 cm -1 has been used for the determination of relatively small quantities of HDO in exchange water [161]. The proportion of deuterated hydroxyl groups on a silica wafer which was in exchange equilibrium with the sample was determined from the intensity of the 2760 cm -1 absorption peak of OD groups by Davydov et al [162]; the total amount of OH groups was then estimated from the quantity of DzO introduced.…”

Section: Active Hydrogenmentioning

confidence: 99%

“…Deuterium exchange techniques (see also section II.B.1.a) are now preferred over other methods. Madely and Richmond [161] measured the OH group density indirectly by spectroscopically determining the D 2 0/ H 2 0 composition in liquid water, which was obtained after extensive D 2 0 exchange with silica surfaces and re-exchange with H 2 0. The value reported was 4.4 ± 0.2 OH nm -2 which very closely corresponds to the generally accepted value for the OH saturation coverage [3,52].…”

Section: Vibrational Spectroscopies A) Infrared Transmission-absorptimentioning

confidence: 99%

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Nature and Estimation of Functional Groups on Solid Surfaces

Boehm

Knözinger

1983

Catalysis

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Section: Active Hydrogenmentioning

confidence: 99%

Section: Vibrational Spectroscopies A) Infrared Transmission-absorptimentioning

confidence: 99%

Nature and Estimation of Functional Groups on Solid Surfaces

Boehm

Knözinger

1983

Catalysis

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“…They were then copiously rinsed with deionized water, blown dry with nitrogen, and dried at 100°C under vacuum for 30 min. This cleaning procedure creates a surface rich in hydroxyl groups at the oxide surface to facilitate the subsequent silanization process [41,42].…”

Section: Substrate Preparationmentioning

confidence: 99%

Ultrathin PFPE Film Systems Fabricated by Covalent Assembly: An Application to Tribology

et al. 2011

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In this study, we have employed covalent molecular assembly to fabricate robust thin film structures comprising molecular layers and have demonstrated its application in tribology. An anhydride-functionalized polymer (gantrez) was deposited over an amine-functionalized silicon surface through covalent binding and employed as an intermediate layer between derivatized silicon and perfluoropolyether (PFPE). X-ray photoelectron spectroscopy, atomic force microscopy, and ellipsometry were employed to study the interfacial chemistry, morphology, and thickness of the assembled films. The films show excellent stability and strength against sonication, which can be attributed to the covalent interlayer linkage. Such films showed wear life of [100,000 cycles in ball-ondisk sliding tests at a normal load of 0.5 N and a sliding rotation of 200 rpm at a track radius of 3.2 mm. The performance was superior compared to that of PFPE-coated self assembled monolayers used as the lubricating layer. The film systems and assembly technique can be employed as nano-lubrication in several technological applications, such as information storage devices and micro-electromechanical systems.

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“…This cleaning procedure creates a surface rich in hydroxyl groups at the oxide surface to facilitate the subsequent silanization process. [2][3] Assembly of aminosilane was performed as described elsewhere, 4 wherein the hydroxyl covered substrates were rinsed with toluene and then immersed in a 3 mM APhS solution in toluene for 2 h. Subsequently, the wafers were removed from the solution, rinsed and sonicated for 10 min with toluene, rinsed again with toluene and then with methanol, finally blown dry with nitrogen. The above-amine terminated substrates were immersed in a 0.5 % (w/v) THF solution of Gantrez for 1 h under nitrogen environment.…”

Section: Immobilization On Silicon Surfacementioning

confidence: 99%

Covalent Assembly of Gold Nanoparticles for Nonvolatile Memory Applications

Gupta

Kusuma

Lee

et al. 2011

ACS Appl. Mater. Interfaces

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This work reports a versatile approach for enhancing the stability of nonvolatile memory devices through covalent assembly of functionalized gold nanoparticles. 11-mercapto-1-undecanol functionalized gold nanoparticles (AuNPs) with a narrow size distribution and particle size of about 5 nm were synthesized. Then, the AuNPs were immobilized on a SiO(2) substrate using a functionalized polymer as a surface modifier. Microscopic and spectroscopic techniques were used to characterize the AuNPs and their morphology before and after immobilization. Finally, a metal-insulator-semiconductor (MIS) type memory device with such covalently anchored AuNPs as a charge trapping layer was fabricated. The MIS structure showed well-defined counterclockwise C-V hysteresis curves indicating a good memory effect. The flat band voltage shift was 1.64 V at a swapping voltage between ±7 V. Furthermore, the MIS structure showed a good retention characteristic up to 20,000 s. The present synthetic route to covalently immobilize gold nanoparticles system will be a step towards realization for the nanoparticle-based electronic devices and related applications.

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A procedure for determining the concentration of Hydroxyl Groups on Silica Surfaces

Cited by 29 publications

References 11 publications

Nature and Estimation of Functional Groups on Solid Surfaces

Nature and Estimation of Functional Groups on Solid Surfaces

Ultrathin PFPE Film Systems Fabricated by Covalent Assembly: An Application to Tribology

Covalent Assembly of Gold Nanoparticles for Nonvolatile Memory Applications

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