Silica porous coating

Figure 2.15 Separation of a mixture of saturated and unsaturated hydrocarbons on a 50 m x 0.32 mm fused silica porous-layer open tubular column coated with alumina modified wl potassium chloride. The separation was performed by temperature programming from 70 to 200°C at 3 C/mln. (Reproduced with permission fr

Pigments with porous coatings for use in emulsion paints obtained by simple treatment with Ti, Al, and Si compounds, giving a silica content of 10% and a TiOz content of 80-85%... 

A device based on a porous silica substrate used as a Fabry-Perot interferometer has been reported as a sensor for organophosphorus nerve agents. The porous silica is coated with a surfactant and a copper hydrolysis catalyst. The mode of operation... 

If solvent extraction may be considered a source technique, derived liquid-liquid separation techniques include configurations in which an extraction solvent is physically immobilized by a coating or impregnation process onto a solid support such as silica, porous resin beads, or foam [13,84—87]. Other derived techniques include membranes of various configurations bulk liquid membranes, supported liquid membranes, emulsion membranes, and polymer-impregnated membranes [88]. Many derived liquid-liquid techniques have been developed, especially for use in analytical applications [13,60,62,64,75,84,85,87]. In each of these derived techniques, the... 

L of air is passed over 400 and 200 mg of coconut charcoal in separate tubes at a flow rate of 10-500 mL/min. The analyte is desorbed with methylene chloride and injected into a GC equipped with an FID. A fused-silica porous-layer open tubular column coated with AI2O3/KCI with or without a back-flushable precolumn may be used as a GC column. Alternatively, a 10% FFAP on a 80/100-mesh Chromosorb W column may be used. 

Tsang et al. [26] described the use of Ft nanoparticles (average size 5nm) encapsulated in porous silica aerogel coating (5% of metal), and then deposited on conventional y-alumina as a composite catalyst for butane oxidation (Fig. 5.6). Preparation of the material was carried out from a microemulsion obtained by using ammonium tetrachloroplatinate(ll), cetyltrimethylamonium bromide in a toluene/water mixture, and then the reduction of platinum anion was accom-... 

Polysaccharides are. preferentially adsorbed on silica surfaces coated with polyaromatic molecules according to Kennedy, Barker, and White (644). It is surprising that a hydrocarbon surface should have any special affinity for such highly hydrophilic molecules. Siliceous porous materials coated with adsorbed 1,3-diaminoben-zene adsorb glycogen and branched polysaccharides but not neutral or charged monosaccharides. 

Belleville P.F., Floch H.G. Ammonia-hardening of porous silica antireflective coatings. SPIE Proc. 

Thomas I.M. High laser damage threshold porous silica antireflective coating. Appl. Opt. 1986 25 1481-1483... 

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