Colloid coating

Lukomska J, Malicka J, Gryczynski I, Lakowicz JR (2004) Fluorescence enhancements on silver colloid coated surfaces. J Fluoresc 14 417 -23... 

Lobmaier, Ch., Hawa, G., Gotzinger, M., Wirth, M., Pittner F., Gabor, F., Direct monitoring of molecular recognition processes using fluorescence enhancement at colloid coated microplates. J Mol Recognit 14, 1-8 (2001). 

Fig. 39 Aggregation of colloids coated with long DNA strands above a sticky surface leads to flying carpets, floating 2D crystals, (a) Confocal microscopy image of a flying carpet (scale bar is 10 pm), (b) Pair correlation function of the structure depicted in (a). The observed peaks match those expected for a perfect hexagonal crystal (black triangles). Reproduced with permission from [165]...

Sol-gel methods fall into two categories, depending on how the colloidal coating solution is formed. The processes are shown schematically in Figure 3.31... 

Au colloids coated with monolayers of thiols terminated with DNA assembled into 3D aggregates either by pairing complementary strands of DNA or by addition of a soluble complementary strand of DNA Molecular recognition (DNA/DNA) nm 1,35,36, 40... 

Using this method to form a nanoparticle coated surface allowed us to better control the size of the nanostructures, but still generated a random distribution of nanoparticles. The density of silver nanostructures could be controlled by both the amount of time the substrate was immersed in the colloidal solution and the concentration of the colloidal solution. Because the size of the metal structures is directly determined by the colloids, sparse to densely packed colloid coated surfaces that maintain a unique metal nanostructure size could be produced by simply varying the incubation time in the colloid solution. 

B — dark, textural horizon, sometimes with bright colloidal coatings. 

Fig. 40 (a) Procedure for coating PS colloids with gold or silver, (b) TEM image of 580 nm PS colloids coated with gold, (c) SEM image of opals made of gold-coated PS composite colloids. Reproduced from [342] with permission of Wiley-VCH... 

Uses SurfactanL thickener, stabilizer, film-former, suspending agent, protective colloid, coating agent in pharmaceuticals, tablet coatings, con-trolled-release prods., encapsulation, nonaerosol hairsprays tablet binder Prt rerties Off-wh. powd., tasteless 99% thru 20 mesh sol. in water (below 38 C) and many polar org. soivs. m.w. 80,000 vise. 300-600 cps (10% aq.) bulk dens. 0.5 g/ml soften, pt. 100-150 C pH 5.0-7.5 (2%) nonionic 5% max. moisture Klucel E Pharm [Hercules/Aqualonj... 

Solid-vapor Solid-liquid Liquid-vapor Liquid-liquid Adsorption, catalysis, contamination, gas-liquid chromatography Cleaning and detergency, adhesion, lubrication, colloids Coating, wetting, foams Emulsions, detergency, tertiary oil recovery... 

Sol-gel methods fall into two categories, depending on how the colloidal coating solution is formed. In the particulate-sol method a metal alkoxide is hydrolyzed by addition of excess water or acid. The resulting precipitate is maintained as a hot solution for some time before it is cooled and coated onto the microporous support membrane. After careful drying and sintering at 500-800°C,... 

Examples of composite separators include the approaches taken by Freudenberg and by Mitsubishi Paper in their products, as described above. In general, there is a nonwoven substrate that has pores that are too large for the nonwoven to function well as a separator without some modification. This nonwoven is then coated, impregnated, or otherwise processed to include a layer, which includes nanoparticles of a size and distribution such that the average pore size is reduced. In one study, a siUca colloidal coating on a PET substrate had superior thermal resistance, wettability, cycle life, and rate capability. ... 

Figure 26. Glass surface geometry (Top) APS is used to functionalize the surface of the glass with amine groups which readily bind silver colloids, absorption spectrum of silver colloids on APScoated glass (Bottom-Left), and AFM image of a silver colloid coated glass (Bottom-Right). APS aminopropylethoxy silane...

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