Hydrophobic coatings

The walls exhibit micro-rib and cavity structures oriented perpendicular (transverse) to the flow direction and the walls are treated with a hydrophobic coating. Re-... 

A potential application of this system is the assessment of the curing and efficacy of hydrophobic coatings applied to cementitious and other building materials. In situ work has yet to be carried out, but laboratory studies suggest that this will be possible [23, 24]. The left part of Figure 2.3.11 shows the ingress of a commercial... 

Pyrite is not only one of the key compounds in Wachtershauser s theory, but could also have fulfilled an important function for phosphate chemistry in prebiotic syntheses. A group in Rio de Janeiro studied the conditions for phosphate sorption and desorption under conditions which may have been present in the primeval ocean. In particular, the question arises as to the enrichment of free, soluble inorganic phosphate (Pi), which was probably present in low concentrations similar to those of today (10 7-10 8M) (Miller and Keffe, 1995). Experiments show that acid conditions favour sorption at FeS2, while a weakly alkaline milieu works in an opposite manner. Sorption of Pi can be favoured by various factors, such as hydrophobic coating of pyrite with molecules such as acetate, which could have been formed in the vicinity of hydrothermal systems, or the neutralisation of mineral surface charges by Na+ and K+. 

K. F. Ghiu and K. W. Wang. Hydrophobic coatings on carbon electrodes for proton exchange membrane fuel cells. Surface and Coatings Technology 202 (2007) 1231-1235. 

Dampproofed concrete, therefore, should not show significant uptake of surface water in conditions of rain and wind up to about 100 km h T In fact, on prolonged exposure, some wetting does occur, because of defects in the hydrophobic coating, and the presence of larger voids in the concrete, up to perhaps 1 mm wide these are due to incomplete compaction, or to the nature of the concrete in the case of blocks. 

Owen, S. J., Meier, F. S., Brombacher, S., and Volmer, D. A. (2003). Increasing sensitivity and decreasing spot size using an inexpensive, removable hydrophobic coating for matrix-assisted laser desorption/ionisation plates. Rapid Commun. Mass Spectrom. 17 2439-2449. 

A two-dimensional array was patterned by standard photolithographic techniques on a substrate [99], An open fluid reservoir was achieved simply by sealing the internal part of the device, including the array, with an O-ring. This open-face arrangement was for laboratory experiments, while the device has to be sealed for later practical uses. A hydrophobic coating served for electrical insulation. The device was connected to a computer-controlled switching circuit. 

Hydrophobically coated flat edge, nine-channel glass chip Pressure flow 100-200 nL/min ESI triple Q Myoglobin (60 nM) Nil Nil 818... 

In addition to these properties, highly hydrophobic coatings are expected to offer beneficial properties for anti-oxidation or anti-current conduction. 

Kennedy, JohnP. Niebergall, PaulJ. Evaluation of extended-release applications for solid dispersion hot-melt fluid bed coatings utilizing hydrophobic coating agents. Pharm. Dev. Technol. 1998, 3 (1), 95-101. 

Consequently, the requirements that are imposed on hydrophobic coatings and water-repellent... 

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