Surface reorganization

Such control of surface functionahties, surface chemical potential, and surface dipole is not possible in mixed SAMs of cofunctionalized saturated -alkanethiols, since dipolar interaction of surface functionahties wiU result in surface reorganization [95, 99-101]. 

As with the corresponding silica supported species, hydrogen treatment at 150 °C for 15 h of (=SiO)Ta(CH2CMe3)2(=CHCMe3) furnishes [(=SiO)2TaHx] as a mixture of mono- and tris-hydride species (Scheme 2.16). Alternatively, a surface reorganization around the metal affords the second Ta-O bond and a =Si-H surface species. 

Fig. 7. Schematic representation of the surface reorganization process upon immersion of SPUs in water. (Reproduced from Kobunshi Ronbunshu [Ref. 57] through the courtesy of Soc. of Polymer Science, Japan)...

Instability in the wettability behavior of OH surfaces was noticed when OH-terminated silane monolayers were exposed to hydrophobic solvents, such as CC14 (175). Similarly, monolayers of 11-hydroxyundecane-thiol (HUT), HO-(CH2)n-SH, on Au(lll) surfaces have been found to undergo surface reorganization by exposure to ambient atmosphere for a few hours (328). After that, the water contact angle reached a value of ca 60°, and only ca 25% of... 

We should point out that the temperature effects on emission intensity and photocurrent are completely reversible. Although this result suggests that electrode stability obtains over the duration of the experiments, the properties measured may not be very sensitive to variations in surface or near-surface composition. There is now considerable evidence, in fact, that surface reorganization processes do occur in CdS- and CdSe- based PECs in polychalcogenide electrolytes (17, 21-26). In particular, the occurrence of such an exchange reaction for CdS Te in polyselenide electrolyte would yield CdSe to whose lower band gap... 

Other electronic levels (surface states) can exist on the semiconductor surface due to adsorbed species or surface reorganization. These states can facilitate electron transfer between electrode and solution. 

Alemozafar AR, Madix RJ (2005) Surface reorganization accompanying the formation of sulfite and sulfate by reaction of sulfur dioxide with oxygen on Ag(lll). J Chem Phys 122 214718... 

Brunschwig B. S., Ehrenson S. and Sutin N. (1986), Solvent reorganization in optical and thermal electron-transfer processes , J. Phys. Chem. 90, 3657-3668. Branschwig B. S. and Sutin N. (1999), Energy surfaces, reorganization energies, and coupling elements in electron transfer . Coord. Chem. Rev. 187, 233-254. 

The last step of the activation process, 6 h at 650°C, reflecting industrial conditions, induced also modifications on the surface of the model catalyst. The Cr species were below the XPS detection limit. This can possibly be attributed to two phenomena (i) desorption due to a decrease of chromate stability, as a result of dehydroxylation and strain induced in the surface Si-0 bond surface reorganization of chromate species [45,46], forming Cr203 aggregates, which are known to be inactive versus ethylene polymerization [7]. 

Fedak and Gjostein 176) have suggested that the existence of potassium impurities produce this tjrpe of surface structure on a Au(lOO) surface, whereas Auger studies 177) on this surface appear to suggest that the surface reorganization may in fact be a real property of the... 

Cross EM, McCarthy TJ. Surface reorganizations in functionalized poly(chlorotrifiuor-oethylene). Abstracts of Papers of the American Chemical Society. 1988 195 141. 

Wong, D., Jalhert, C.A., Orourke-Muisener, P.A.V., Koberstein, J.T. Surface dynamics of polymer glasses sub-Tg surface reorganization in end-functional polymers. Macnnnolecules 45, 7973-7984 (2012)... 

It has been shown that the adsorption of contaminants and surface reorganization also has an adverse effect on the bonding properties of PDMS. 

To increase the stability of a surface-treated substrate, a variety of approaches have been developed. For example, different plasma gases can be applied to reduce the amount of surface reorganization. Specifically, nitrogen-treated surfaces maintain their hydrophilicity longer than oxygen plasma-treated surfaces. Also, to maintain stable hydrophilic PDMS, it is possible to fabricate C-F bonds or react poly(HEMA) bonds on PDMS microchannel surfaces [5]. 

Superhydrophobicity, polyurethane, contact angle hysteresis, surface reorganization... 

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