Hollow glasses

Results of uniaxial strain static and gas gun compression tests on syntactic foam have been conducted. The foam was buoyant and composed of hollow glass microspheres (average diameter 100 microns) embedded in an epoxy plastic. Static testing consists of compressing a 0.25 cm x 2.5 cm dia. wafer between carefully aligned 2.5 cm dia. steel pistons. Lateral expansion of the wafer is... 

There are many weighting materials, including barite and iron oxides, to increase the specific weight of a slurry. Conversely, the specific weight can be reduced by foaming or hollow glass particles. 

Initially glass microspheres were used in the 1970s to overcome severe lost circulation problems in the Ural Mountains. The technology has been used in other sites [1189]. Hollow glass beads reduce the density of a drilling fluid and can be used for underbalanced drilling [1199-1201]. Field applications have been reported [73]. 

G. H. Medley, Jr., J. E. Hasten, R. L. Montgomery, I. D. Martindale, and J. R. Duda. Field application of lightweight, hollow-glass-sphere drilling fluid, y Petrol Technol, 49(11) 1209-1211, November 1997. 

G. H. Medley, Jr., W. C. Maurer, and A. Y. Garkasi. Use of hollow glass spheres for underbalanced drilhng fluids. In Proceedings Volume, pages 511-520. Annu SPE Tech Conf (Dahas, TX, 10/22-10/25), 1995. 

Schmitt, M.L., J.E. Shelby and M.M. Hall, Preparation of hollow glass microspheres from sol-gel derived glass for application in hydrogen gas storage. /. Non-Crystalline Solids, 352, 626-631,2006. 

Mohebbi, M. Fedosejevs, R. Gopal, V. Harrington, J. A., Silver coated hollow glass wave guide for applications at 800 nm, Appl. Opt. 2002, 41, 7031 7035... 

Strip lighting in a classroom, hospital, business hall or kitchen is often called fluorescent lighting, although in fact it is a phosphorescent process, as above. Each bulb consists of a thin, hollow glass tube that is sealed at both ends. It contains gas such as helium, argon or krypton, and a drop of liquid mercury (about 0.5 mg of mercury per kilogram of lamp, or 0.5 parts per million). Like the neon and sodium lamps above, the pressure inside the tube is about 30 Pa, so the mercury evaporates to become a vapour. It is the mercury that yields the light, albeit indirectly. 

Solid and hollow glass microspheres have been made for many years for a variety of applications. Fabrication techniques involving formation of microspheres were pioneered by Beck7 and later expanded by Howell8 and Marshall9. 

IT. Filling Hollow Glass Spheres with Complex Hydrides... 

Formation of Porous Wall Hollow Glass Spheres... 

Figure 2 Scanning Electron Microscopy of hollow glass spheres a) Before acid leaching and b) After acid leaching...

Figure 4 Interior image of a cracked hollow glass sphere. Presence of a) bumpy structures and b) Needle shaped bundled structures...

Figure 5 Elemental mapping of the interior of a cracked hollow glass sphere following filling with sodium alanate...

ENCAPSULATION OF PALLADIUM IN POROUS WALL HOLLOW GLASS MICROSPHERES... 

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