Dispersion glasses

Figure 1.20 Encapsulation of microdroplets of liquid crystals in ORMOSIL matrices results in materials with better transparency and thermal stability than polymer-dispersed liquid crystals. Gel-glass dispersed liquid crystal device switched between the OFF and ON state (thickness 10 pm, 4 x 2 cm, Fp p = 90V). (Reproduced from ref. 45, with permission.)...

The apparatus used is shown in Fig. 2 (Note 1). A solution of sodium ethoxide prepared by dissolving 2.5 g. of clean sodium metal (0.11 gram atom) in 230 g. (292 ml., 5 moles) of absolute ethanol under anhydrous conditions is added to the reaction tube C. The tube C thus charged is weighed, and placed in position with the gas inlet tube, fitted with fritted-glass dispersion cylinder D, extending nearly to the bottom. Several inches of ethanol is placed in the tube G, which serves as a flow indicator. The... 

It 1s assumed that the body panel will be made 1n an existing facllty of a medium sized molder having state-of-the-art equipment. For RIM, a typical plant was deemed to have twelve clamps with one metering unit and glass dispersion unit servicing four clamps. 

The chemically resistant coatings, such as the baked phenolics, baked epoxies, and the air-dry epoxy, vinyl, and neoprene coatings, are ideal for minimizing contamination of chanicals handled in steel equipment. They should not be used where 100% protection from corrosion is required. An excellent material for immersion service has been developed that consists of flakes of glass dispersed in a polyester resin. This is applied by spray to a properly prepared surface, and the wet coating is rolled with a paint roller to orient the glass flakes in a plane parallel to the substrate and to provide maximum resistance to chemical attack. 

The inverted filtration technique employed to wash a precipitate is illustrated in Fig. 6. The liquid to be removed is drawn off through a sintered-glass dispersion... 

Bhoga SS, Singh K (1999) A new Na glass-dispersed Na CO composite for a solid state electrochemical CO gas sensor. J Solid State Electrochem 3 258-263... 

Allen LV Jr, Yanchick VA, Maness DD (1977) Dissolution rates of corticosteroids utilizing sugar glass dispersions. J Phatm Sci 66 494-497... 

GRTP can be molded on ram machines but they are generally not recommended because of their high heat input, poorer glass dispersion, less homogeneous melt, and inability to use direct processing (powder-glass) techniques. 

Gel-Glass-Dispersed Liquid Crystal (GDLC) Materials... 

Zayat, M. and Levy, D. (2003) Surface organic modifications and the performance of sol—gel derived gel—glass dispersed liquid crystals (GDLCs). Chem. Mater., 15, 2122 2128. 

Lamchem PE-130 K Solec 3F SB dispersant, chromatography Spheriglas A Glass dispersant, chrome soaps Dlsponi AES48 dispersant, CIP cleaners AG 6202 AG 6206... 

Electro-Optical Properties of Gel-Glass Dispersed Liquid Grystals Devices by Chemical Modification of the LC/Matrix Interface... 

Levy, D., Pena, J.M.S., Serna, C.J., and Otdn, J.M. 1992. Glass dispersed Uquid-ciystals for electroopti-cal devices. J. Non-Cryst. Solids 147 646-651. 

Chang, W.P., Whang, W.T., and Wong, J.C. 1995. Electrooptic characteristics of amino-gel-glass-dispersed liquid-crystal and its matrix formation. Jpn. J. Appl. Phys. 34(4A) 1888-1894. 

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