Coatings sol-gel

The sol-gel coating technique offers the opportunity of a future automated coating process for micro structured reactors. After reactor bonding, the sol, which has a much lower viscosity than wash coat slurries, may simply be pumped through the 

Janicke et al. [63] applied a sol-gel-type deposition technique by filling micro channels with aluminum hydroxide solution, which was dried and caldned at 550 °C thereafter. Platinum was introduced as catalyst by impregnation on the coating up to three times, resulting in different loadings of the precious metal. 

The highest surface area enhancement factors were determined for the alumina coatings prepared with AISB, followed by alumina from aluminum triisopropylate, silica and titania. Alumina coatings were deposited in a ready-mounted micro structured reactor. The coatings had a thickness of 2-3 pm. They were impregnated with palladium and successfully applied to hydrogen oxidation [67] (see Section 2.5.1). 

Chen et al. [152] prepared a Pt/Al203 catalysts by different sol-gel procedures, either by depositing the carrier sol and the catalyst solution simultaneously or subsequently on to micro channels made of silicon wafers. 

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Sol-gel. A limited evaluation of sol-gel coatings on stainless steel has been reported with the goal of reducing hazardous wastes and other environmentally undesirable materials [22]. In this study, the GTMS/TPOZ sol-gel discussed... 

Sakka S (1996) Sol-Gel Coating Films for Optical and Electronic Application. 85 1-50... 

We prepared ceria on Ni substrate by sol-gel coating method. Ceria sol solution was prepared with ceria sol solution (Alfa, 20% in H2O, colloidal dispersion) mixed with ethanol (99.9%, Hayman) with weight ratio (1 2) and stirred. Ceria was deposited on Ni substrate by dip coating method. The variation number of dipping was carried out to obtain different coating ratio. The anode was completely dipped into the ceria sol solution for several seconds and dried at a temperature of 50 C for 24 hours in air atmosphere followed by calcination at 700 C for 30 minutes in 5%H2-N2 atmosphere. 

Development of multifunctional sol—gel coatings antireflection coatings with enhanced self-cleaning capacity. Solar Energy Materials and Solar Cells, 94, 1081-1088. 

Han L., Niemczyk T.M., Lu Y., Lopez G.P., Chemical Sensors Based on Surface-Modified Sol-Gel-Coated Infrared Waveguides, Appl. Spectrosc., 1998 52(1) 119-122. 

Sol-gel coating technique for optical chemical sensors and biosensors is now in extensive research phase. For example, the side-coating of optical fibers or waveguides in evanescent-wave sensors it is particularly important to control precisely the sensitivity determining parameters, such as the coating thickness and length45. 

The fabrication and characterization of a fiber optic pH sensor based on evanescent wave absorption was presented by Lee63. The unclad portion of a multi-mode optical fibre was coated with the sol-gel doped with pH sensitive dye. The sensitivity of the device increased when the multiple sol-gel coatings were used in the sensing region. The dynamic range and the temporal response of the sensor were investigated for two different dyes -bromocresol purple and bromocresol green. 

Lee S., Gin J., Nampoori V., Vallabhan C., Unnikrishnan N., Radhakrishnan P., A sensitive fibre optic pH sensor using multiple sol-gel coatings, Journal of Optics A Pure and Applied Optics 2003 3 355-359. 

Villegas M.A., Pascual L., Sol-gel coatings doped with a pH sensitive chromophore, Thin Sold Films 1999 351 103-108. 

P.N. Deepa and S.S. Narayanan, Sol-gel coated Prussian blue modified electrode for electrocatalytic oxidation and amperometric determination of thiols. Bull. Electrochem. 17, 259-264 (2001). 

Figure 2.16 Effect of sol-gel coating precursors on release. Tablets were coated twice and dried at 60 °C. The release media were 0.05 M phosphate buffer solutions at pH = 7.4. (Reproduced from ref. 11, with permission.)...

Figure 4.6 (a) The settlement of Ulva zoospores on sol-gel coatings and the number... 

With careful selection of the combination of starting alkoxides and appropriate synthesis conditions, silica-based sol-gel technology is now widely applied to the conservation of art objects and cultural heritage. For example, a hybrid sol-gel coating protects the fourteenth-century... 

A. N. Khramov, V. N. Balbyshev, L. S. Kasten and R. A. Mantz, Sol-gel coatings with phosphonate functionalities for surface modification of magnesium alloys, Thin Solid Films, 2006, 514, 174. 

Figure 7.2 Hybrid sol-gel coatings are ideally suited to protect optical fibres.

Sol—gel, alumina derived from, 23 76—78 Sol-gel bioactive glasses, 23 82-83 Sol-gel chemistry aerogels, 1 749-753 ceramics processing, 5 642 Sol-gel coatings, 5 665... 

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