Heat of immersion of zinc oxide in organic liquids. 1. Effect of surface hydroxyls on the electrostatic field strength

Abstract

hous, hydrated iron oxide layer. The amount of additional film formation was substantial for borate-formed annealed oxide in borate solution at positive potentials but much less at open-circuit potential or for HC104-formed oxides reimmersed into HC104 or HC1 solutions. The voltammograms in 0.1 M KC1 and 0.1 M HC1 were similar, indicating that pitting and dissolution in chloride media are pH independent, as reported by others.17 The role of Cl" adsorption in the pitting process is not well understood, and many theories have been proposed.13,17,18 Our results show that although significant amounts of Cl (2-8%) were incorporated into the film formed on a clean Fe-Cr-Ni-(111) surface in HC1, only traces of Cl (about 1%) were detected by Auger spectroscopy when breakdown of an annealed oxide film occurred in HC1. Evidently Cl adsorption occurs only at localized sites and at total concentrations too small to be detected by Auger spectroscopy.

Determination of the concentration of surface hydroxyl groups on metal oxide films by a quantitative XPS method

“…26 Average values for oxide-covered chromium, titanium and tantalum are 13, 11 and 6 OH groups nm~2, respectively. These values are consistent with the range of values of 5È15 OH nm~2 for various high-area bulk oxide powders as collected in an earlier compilation, 68 (17). The following pertains to the Ðrst set of data listed in Table 4 for Al in the "as-receivedÏ condition.…”

“…Figure 12 shows the oxide Ðlm thickness as calculated from Eqn. (17) for the aluminum sample in Fig. 11.…”

“…Table 4 lists the thicknesses of the native air-formed oxide Ðlms as calculated from Eqn. (17). The sputtering rates are given by plots such as Fig.…”

Solventless Synthesis of MOFs at High Pressure

“…38 Here, hydrogen bonds can be established between the atoms in the imidazole group of the ligand 19 and the hydroxyls present in the ZnO external surface (5.5 m 2 /g). 39 Alternatively, oxygen vacancy sites in ZnO could also contribute to hydrogen bond interaction. 40 with the imidazolate ligand.…”

Factors influencing the excited-state behavior of ruthenium(II) complexes adsorbed on aqueous laponite

“…Noll et aL3 determined the heat of preferential adsorption of a saturated aqueous solution of sodium decylbenzenesulfonate (or sodium dodecylbenzenesulfonate) onto Cleveland sand in a liquid-flow calorimeter; their values are not directly comparable with our data because the amount adsorbed is unknown. Berg et al 4 measured the enthalpy of adsorption of solutions with increasing sodium dodecylbenzenesulfonate concentrations on silica gel in a flow calorimeter; the heat of dilution in their experiments was negligible, but unfortunately, the amount adsorbed was not determined. Rouquerol and Partyka6 determined the enthalpy of displacement of sodium dodecylbenzenesulfonate on Fontainebleau sand in a batch calorimeter; these authors corrected their results for the enthalpy of dilution and they also determined the amount adsorbed.…”