Journal ArticleDOI
In situ FTIR-ATR analysis and titration of carboxylic acid-terminated SAMs.
Olga Gershevitz,Chaim N. Sukenik +1 more
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FTIR-ATR measurements permit detailed structural analysis and in situ titration of carboxylate-terminated self-assembled monolayers and monomeric and dimeric/oligomeric acid groups are seen, and their acid-base behavior is directly monitored.Abstract:
FTIR-ATR measurements permit detailed structural analysis and in situ titration of carboxylate-terminated self-assembled monolayers. Both monomeric and dimeric/oligomeric acid groups are seen, and their acid−base behavior is directly monitored. Monomers that are hydrogen bonded only to surrounding water molecules have a pKa = 4.9, while the pKa for the aggregated molecules is 9.3.read more
Citations
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Engineering silicon oxide surfaces using self-assembled monolayers.
TL;DR: The controlled organization of molecules and molecular assemblies on silicon oxide will have a prominent place in "bottom-up" nanofabrication, which could revolutionize fields such as nanoelectronics and biotechnology in the near future.
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pH-responsive carrier system based on carboxylic acid modified mesoporous silica and polyelectrolyte for drug delivery
TL;DR: In this article, an efficient pH-responsive carrier system has been constructed by oppositely charged ionic interaction between carboxylic acid modified SBA-15 silica rods and polyelectrolyte.
Journal ArticleDOI
Second Harmonic Generation, Sum Frequency Generation, and χ(3): Dissecting Environmental Interfaces with a Nonlinear Optical Swiss Army Knife
TL;DR: It is demonstrated that nonlinear optics has now assumed the role of a Swiss Army knife that can be used to dissect, with molecular detail, the fundamental and practical aspects of environmental interfaces and heterogeneous geochemical environments.
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Precise tuning of porosity and surface functionality in Au@SiO2 nanoreactors for high catalytic efficiency
TL;DR: In this article, the porosity of silica shells was readily controlled by introducing C18TMS as a porogen with heat treatment, which directly altered the turnover frequency and rate constant of the reaction.
Journal ArticleDOI
Metal@Silica yolk-shell nanostructures as versatile bifunctional nanocatalysts
Ji Chan Park,Hyunjoon Song +1 more
TL;DR: In this article, a new class of bifunctional catalysts with a metal@silica yolk-shell nanostructure is introduced, which has many advantages as a heterogeneous catalyst since it ensures a homogeneous environment around each metal core and particle sintering is effectively eliminated during high temperature reactions.
References
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Fundamental studies of microscopic wetting on organic surfaces. 1. Formation and structural characterization of a self-consistent series of polyfunctional organic monolayers
TL;DR: In this article, a series of terminally substituted alkyl thiols, X(CH 2 ) 15 SH (X=CH 3, CH 2 OH, CO 2 H, CO2 CH 3, and CONH 2 ), have been prepared by adsorption from solution onto evaporated gold substrates.
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Structure and reactivity of alkylsiloxane monolayers formed by reaction of alkyltrichlorosilanes on silicon substrates
TL;DR: In this article, the authors characterized the properties of ordered alkylsiloxane monolayer films and showed that they were stable in common organic solvents, water, and acid, but were destroyed by prolonged exposure to base.
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Effect of Degree, Type, and Position of Unsaturation on the pKa of Long-Chain Fatty Acids
James R. Kanicky,Dinesh O. Shah +1 more
TL;DR: The pK(a) values of stearic, elaidic, oleic, linoleic, and linolenic acids were studied and compared to values of area per molecule in a spread monolayer of these acids and it was found that as area per molecules increases the intermolecular distance increases and pK (a) decreases due to reduced cooperation between adjacent carboxyl groups.
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Use of nitrogen vs. carbon dioxide in the characterization of activated carbons
Julián Garrido,Angel Linares-Solano,J.M. Martín-Martínez,Miguel Molina-Sabio,Francisco Rodríguez-Reinoso,R. Torregrosa +5 more
TL;DR: Etudes de ladsorption de N 2 (77 K) and de CO 2 (273 et 298 K) sur a serie de charbons actifs, ayant subi different degres de calcination.
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Force Titrations and Ionization State Sensitive Imaging of Functional Groups in Aqueous Solutions by Chemical Force Microscopy
TL;DR: Adhesion and friction forces were observed to depend on the chemical identity of the tip and sample surface and also were found to be highly sensitive to the changes in the ionization state of the terminal functionalities induced by varying the solution pH.