Coatings barium

TNT-Coated Barium Nitrate. 30g of TNT in ale soln is added to 270g of Ba nitrate in an ale slurry under agitation. The temp of the mixt is maintained at 80° and stirring is contd until most of the ale is evapd, The coated material is spread in a thin layer and air dried overnight. The Ba nitrate thus coated with 10% TNT is reduced to an intimate mixt by hand rolling and blending before use... 

The product used was a hard gelatin capsule, size 0 (Posilok, Elanco), containing coated verapamil hydrochloride pellets (100 mg of verapamil hydrochloride) and coated barium sulphate pellets. 

Macheras, P. Reppas, C. Dressman, J.B. Biopharmaceutics of orally administered drugs. Ehis Horwood. 1995. Horton, R. E. Ross, F.G.M. Darhng, G.H. Determination of the emptying time of the stomach by use of enteric-coated barium granules. Br. Med. J. 1965, 1, 1537-1539. Wilson, C.G. Washington, N. InHandbook of Pharmaceutical Controlled Release Technology Wise, D.L. Ed. Marcel Dekker New York, 2000 551-565. 

Figure 5.29. Penetration rate of water through column packed with grafted and stearate coated barium sulfate. [Adapted, by permission, from TsubokawaN, Seno K,7. Macromol. Sci. A, 31, No.9, 1994, 1135-45.]...

Wegmann, M., Clemens, F., Hendry, A., Graule, T., Dispersion of lanthanoid-coated barium titanate in a paraffin-based extrusion binder system . Ceramics International, 32 [2], 2006,147-156. 

Silica, fumed Tartrazine Titanium dioxide Ultramarine blue Ultramarine violet pigment, protective coatings Barium molybdate... 

Figure 8. Aluminum phosphate-coated barium aluminosilicate (BAS) showed 30-40% improvement on erosion test. The eroded area during a sand erosion test is circled in the right side photograph.

Gan, L.M., L.H. Zhang, H.S.O. Chan, and C.H. Chew. 1995. Preparation of conducting polyaniline-coated barium-sulfate nanoparticles in inverse microemulsions. Mater Chem Phys 40 (2) 94-98. Gaponik, N.P., and D.V. Sviridov. 1997. Synthesis and characterization of PbS quantum dots embedded in the polyaniline film. Ber Bunsen Phys Chem 101 (11) 1657-1659. 

Brine impurities can also affect the anode coating. Barium sulfate, for example, precipitates on or in the coating and can destroy its catalytic action. Other ions harmful to the anode coating include lead, manganese, and fluoride. 

Figure 8 Static yield stress of urea coated barium titanyl oxalate /silicone oil suspension is plotted as a function of applied electric field for two solid concentrations. Inset logarithm of the current density J plotted as a function of iE. Reproduced with pennission from W. Wen, X. Huang, S. Yang, K. Lu, and P. Sheng, Nature Materials, 2(2003)727...

Figure 7-3 (author s unpublished experimental data) demoiKtrates the results of the impedance analysis for a medium composed of insulating-base silicon oil with characteristic resistance 10 ohm and capacitance 5 10" F with added 25% urea-coated barium titanyl oxalate conductive particles with characteristic resistance 10 ohm and capacitance 10" F at 25 °C. The pure base oil shows a single relaxation, and particle-containing samples show relaxations at high frequency due to the conductive particles and at low frequency due to the base fluid in the complex modulus plot. 

Chromium Chromate. Chromium chromate treatment baths are acidic and made up from sources of hexavalent chromium and complex fluoride, fluorosiHcate, fluorozirconate, fluorotitanate, and siHcofluorides. Optional additional components added to accelerate coating rate are free fluoride, ferricyanide, and other metal salts such as barium nitrate. Conversion coating on aluminum precedes by the following reactions (2,3,17) ... 

Toxic Constituents. The seed coat of European beechnut contains an unidentified toxic substance that makes the feeding of beechnut cake to certain farm animals ha2ardous (47). A toxic concentration (up to 4000 ppm) of barium found in some Bra2il nut kernels (30,48) has been reported to... 

Antimony tris(isooctylthioglycolate) has found use in pipe formulations at low levels. Its disadvantage is that it cross-stains with sulfide-based tin stabilizers (122). Barium—zinc stabilizers have found use in plasticized compounds, replacing barium—cadmium stabilizers. These are used in mol dings, profiles, and wire coatings. Cadmium use has decreased because of environmental concerns surrounding certain heavy metals. 

Cesium was first produced ia the metallic state by electrolysis of a molten mixture of cesium and barium cyanides (2). Subsequentiy the more common thermochemical—reduction techniques were developed (3,4). There were essentially no iadustrial uses for cesium until 1926, when it was used for a few years as a getter and as an effective agent ia reduciag the electron work function on coated tungsten filaments ia radio tubes. Development of photoelectric cells a few years later resulted ia a small but steady consumption of cesium and other appHcations for cesium ia photosensing elements followed. 

The only components in a coating powder which might cause the waste to be classified as hazardous are certain heavy-metal pigments sometimes used as colorants. Lead- (qv) and cadmium-based pigments (qv) are seldom used, however, and other potentially hazardous elements such as barium, nickel, and chromium are usually in the form of highly insoluble materials that seldom cause of the spent powder to be characterized as a hazardous waste (86). 

Boron, as barium metaborate, is marketed as a mildew preventative for paints (273). Borax is used as a wood preservative, and an organic boron, 2,2 -(l-methyltrimethylenedioxy)-bis(4,4,6-trimethyl)-l,3,2-dioxaborinane (Biobor JF) [14697-50-80] is a biocide for jet fuel (274). Whereas tin metal is used to coat steel cans used as food containers, organic tin in the form of tributyl tin compounds have proven to be powerfiil antimicrobials, and have found use in antifouHng coatings for ship bottoms, paints, and wood preservatives (275). 

For electrical insulation china clay is commonly employed whilst various calcium carbonates (whiting, ground limestone, precipitated calcium carbonate, and coated calcium carbonate) are used for general purpose work. Also occasionally employed are talc, light magnesium carbonate, barytes (barium sulphate) and the silicas and silicates. For flooring applications asbestos has been an important filler. The effect of fillers on some properties of plasticised PVC are shown in Figure 12.21 (a-d). 

Figura 2.9 Dse of th Grob test Mixture to compare tbe activity of various glass surfaces coated with ov-ioi. Surface types A > Untreated pyrex glass, B pyrex glass deactivated by thermal degradation of Ceurbowax 20M, C < SCOT column, prepared with Silanox 101, D pyrex glass column coated with a layer of barium carbonate and deactivated as in (B), and E - untreated fused silica. Components are identified in Table 2.7 with ac - 2-ethylhexanoic acid. (Reproduced with permission from ref. 152. Copyright Elsevier Scientific Publishing Co.)...

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