Adsorbed monolayers of organic

Nuzzo, R.G., Fusco, F.A, AUara, DX. Spontaneously organized molecular assemblies. 3. Preparation and properties of solution adsorbed monolayers of organic disulfides on gold surfaces. J. Am. Chem. Soc. 109, 2358-2368 (1987)... 

The ITIES with an adsorbed monolayer of surfactant has been studied as a model system of the interface between microphases in a bicontinuous microemulsion [39]. This latter system has important applications in electrochemical synthesis and catalysis [88-92]. Quantitative measurements of the kinetics of electrochemical processes in microemulsions are difficult to perform directly, due to uncertainties in the area over which the organic and aqueous reactants contact. The SECM feedback mode allowed the rate of catalytic reduction of tra 5-l,2-dibromocyclohexane in benzonitrile by the Co(I) form of vitamin B12, generated electrochemically in an aqueous phase to be measured as a function of interfacial potential drop and adsorbed surfactants [39]. It was found that the reaction at the ITIES could not be interpreted as a simple second-order process. In the absence of surfactant at the ITIES the overall rate of the interfacial reaction was virtually independent of the potential drop across the interface and a similar rate constant was obtained when a cationic surfactant (didodecyldimethylammonium bromide) was adsorbed at the ITIES. In contrast a threefold decrease in the rate constant was observed when an anionic surfactant (dihexadecyl phosphate) was used. 

Microphonic Fourier transform infrared photoacoustic spectroscopy (FT-IR/PAS) has emerged as a useful tool for characterizing fractions of a monolayer of organic species adsorbed on opaque, high surface area samples. Such a study of calcined and sulfided hydrodesulfurization catalysts will be discussed. 

Laser induced transient spectra and decay kinetics have been observed from a wide variety of samples including fractions of monolayers of organic molecules adsorbed on catalytic metal oxide surfaces(3, 4), and included within zeolites(5), from... 

FIG. 17 Temperature dependence of ET rate between ZnPor+ and Fe(CN) across the ITIES with adsorbed monolayer of C-10 (A) and C-16 (B). The organic phase contained 0.25 M THAC104, 0.5 mM ZnPor, and 60 /xM C-10 or 110 /xM C-16. The water phase was 0.1 M NaCl, 0.1 M NaC104, and 7 mM Fe(CN) . The temperature was controlled within 0.01°C. The standard deviations were calculated using at least four different data points. (From Ref. 27.)... 

Concepts of ordering and reactivity in two dimensions can be also addressed in studies with organic, ionic, or metallic (sub)-monolayers at potentiostatically controlled electrode-electrolyte interfaces. This approach offers the advantage, in comparison to a nonelectrochemical environment, that the structural and dynamic properties of the adsorbate and the substrate can be directly tuned through the applied electrode potential. The first electrochemical studies of 2D phase transitions were mostly confined to processes occurring at ideally smooth mercury electrodes. Typical examples are the formation of compact monolayers of organic molecules or salts [15, 16] and so-called... 

Monolayers of organic adsorbates bonded on silicon wafer surfaces have properties for prospective applications in nanometer-scale physical science, chemistry, biology, and industrial technology [1-3]. The covalent linkage in organic adsorbates... 

When a monolayer of phospholipids is adsorbed at the ITIES, there must be a modification of the electrical structure of the interface [60]. Since we aim at describing the effect of this monolayer on the rate of ion transfer in a simple way, we assume a sharp interface also in the presence of phospholipids. The hydrophobic tails are located in the organic phase (negative x region), and the hydrophilic headgroups are located in the aqueous phase (positive X region). 

Jarvis, N.L. and Zisman, W.A. "Surface Activity of Fluorinated Organic Compounds at Organic-Liquid/Ari Interfaces Part III. Equation of State of Adsorbed Monolayers and Work of Adsorption of a Fluorocarbon Group," Naval Research Labs Report 5401, Surface Chemistry Branch, Chemistry Division, November 17, 1959. 

LAJs based on liquid metal electrodes have been extensively used in different geometries and modes to incorporate and study a large number of organic compounds [76, 85, 88, 106-108, 132, 160-171]. The wide use of Hg-based electrodes relies on the properties of this metal (1) it is highly conductive, (2) it forms well-ordered SAMs in a few seconds [166], (3) its surface, as a liquid, is free of structural features that cause defects in adsorbed monolayers and (4) it can form a... 

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