Zinc silicates

Valentinite, see Antimony(III) oxide Verdigris, see Copper acetate hydrate Vermillion, see Mercury(II) sulflde Villiaumite, see Sodium fluoride Vitamin B3, see Calcium (+)pantothenate Washing soda, see Sodium carbonate 10-water Whitlockite, see Calcium phosphate Willemite, see Zinc silicate(4—)... 

Vapour phase synthesis may be carried out by passing a mixture of acetylene and acetic acid through a reaction tube at 210-215°C. Typical catalysts for this reaction are cadmium acetate, zinc acetate and zinc silicate. The monomer in each of the above mentioned processes is purified by distillation. 

Modified or pure silicone resin with aluminum Zinc silicate... 

Zinc silicate This material has good corrosion resistance and can withstand temperatures up to 540°C, particularly when over-coated with silicone-based aluminum. The zinc silicate requires a high standard of surface preparation before application. 

Paints are complex formulations of polymeric binders with additives including anti-corrosion pigments, colors, plasticizers, ultraviolet absorbers, flame-retardant chemicals, etc. Almost all binders are organic materials such as resins based on epoxy, polyurethanes, alkyds, esters, chlorinated rubber and acrylics. The common inorganic binder is the silicate used in inorganic zinc silicate primer for steel. Specific formulations are available for application to aluminum and for galvanized steel substrates. 

The zinc silicate, epoxy and coal tar/epoxy coatings are still used. Coal tar epoxies are used for crude oil tanks, sometimes on all the interior surfaces but more often for a) the bottom of the tank and about 2 m up the sides, b) the top of the tank and about 2 m down the sides, and (c) other horizontal surfaces where seawater ballast may lie. These partly coated tanks are frequently also fitted with cathodic protection to prevent corrosion of the uncoated areas when seawater ballast is carried. The pure epoxy or coal tar epoxy coatings applied in bulk cargo tanks used for the carriage of grain must be approved by the North of England Industrial Health Service, or by similar independent authorities in other countries. 

Thin-layer plates were made with silica gel-calcium sulfate and each contained a mixture of zinc silicate and zinc cadmium sulfide as phosphors. Separated components are generally visible under ultraviolet light by fluorescence quenching. This was true, in part, for the pyrethrins, except that some of the separated components possessed a natural fluorescence under the ultraviolet lamps. 

Attempts have been made to improve the mechanical properties of these cements by adding reinforcing fillers (Lawrence Smith, 1973 Brown Combe, 1973 Barton et al, 1975). Lawrence Smith (1973) examined alumina, stainless steel fibre, zinc silicate and zinc phosphate. The most effective filler was found to be alumina powder. When added to zinc oxide powder in a 3 2 ratio, compressive strength was increased by 80 % and tensile strength by 100 % (cements were mixed at a powder/liquid ratio of 2 1). Because of the dilution of the zinc oxide, setting time (at 37 °C) was increased by about 100%. As far as is known, this invention has not been exploited commercially. 

In the presence of silica, zinc silicate is formed, the sintering process is improved and the increase in grain size is enhanced (Zhuravlev, Volfson, Sheveleva, 1950). Mineralizers, such as fluorite, cryolite and borax, have a similar effect (Zhuravlev, Volfson Sheveleva, 1950). These mineralizers enhance sintering and promote growth in grain size. As a result the sintering temperature can be reduced from 1350 °C to 1150-1200 C. 

Poetschke (1925) patented a dental silicate powder prepared by fusing zinc silicate with calcium fluoride. This is a kind of silicophosphate cement (Section 6.6). Thomsen (1931) attempted to formulate a water-setting dental cement. Heynemann (1931) included lithium salts in the flux and Brill (1935) included them in the liquid. 

Uechi, 1., Katsuki, A., Dunin-Barkovskiy, L. and Tanimoto, Y. (2004) 3D-morphological chirality induction in zinc silicate membrane tube using a high magnetic field. J. Phys. Chem. B, 108,... 

To prevent contamination, the tanks will be lined with epoxy, except for the bottom and the lower 2 ft of the sides. The lower portions will be lined with an inorganic zinc silicate such as Dimetcote to prevent rust formation and to allow static charges that may develop in the liquid to drain off through the tank.23... 

Cobalt zinc silicate blue phenacite, formula and DCMA number, 7 347t Co-base superalloys, 13 503, 525-527 composition of, 13 526 Cobbing services, magnetic drums used in, 15 445-446 Cobb test, 13 101 Cocaine, 2 74, 79, 80, 108 economic aspects, 2 108 Cocamide DEA, function as ingredient in cosmetics, 7 829t... 

Examples Barium diphenylamine sulphonate 2,7-dichlorofluorescein Fluorescein (0.2% w/v in Ethanol) Morin (0.1% w/v in Ethanol) Sodium fluorescinate (0.4% w/v in water) Rhodamine B Zinc Silicate Calcium silicate Methylumbelliferone (or 7-hydroxy-4-methyl coumarin). 

Unless otherwise specified, the vendor shall commercially sand blast, in accordance with SSPC SP 6, all grout contact surfaces of the baseplate, and coat those surfaces with inorganic zinc silicate in preparation for epoxy grouting. 

Esperite is a calcium lead zinc-silicate mineral. The crystal structure is mono-clinic-prismatic (P21/m) with a B2 jm group. Steady-state laser-induced luminescence of esperite was ascribed to Mn " in Zn and Ca positions, accompanied by Dy " and Sm " lines. Besides that reabsorption lines of Nd " and have been found (Gorobets and Rogojine 2001). The laser-induced time-resolved... 

Figure 5. The brilliant blue-violet emission of (A), and the green emission of zinc silicate activated by Mn (B).

Figure 6. The spectral power distribution of a fluorescent lamp containing two rare earth phosphors, those of Figures 1 (Curve A) and 5 (Curve A), and green-emitting zinc silicate Mn. A closer approximation to Figure 3 is desirable.

The coatings of many TLC plates contain a manganese-activated zinc silicate that glows bright green under fluorescent light (254 nm). Samples that absorb UV light at that wave-... 

In a letter to the Annals of Philosophy, dated Cambridge, February 18, 1820, Edward Daniel Clarke wrote as follows Some varieties of radiated blende from Przibram in Bohemia are described by Stromeyer as containing two or three per cent of cadmium. At a sale. .. in London, I procured specimens of the particular mineral thus alluded to, which were sold under the name of splendent fibrous blende from Przibram, pronounced Pritzbram. I found afterwards that they had been brought to England by Mr. J. Sowerby of Lisle-street, a dealer in minerals.. . . Upon my return to Cambridge, I endeavoured to obtain cadmium from this ore, and succeeded. . . (133). Clarke also found this element in die zinc silicate from Derbyshire, England, and his results were soon confirmed by W. H. Wollaston and J. G. Children. In 1822 Clarke published a paper on the presence of cadmium in commercial sheet zinc (134). 

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