Quartz and Glass

M. Berthelot2 found quartz permeable to nitrogen at 1300°—vide quartz and glass. The adsorption of nitrogen by platinum has been studied by T. Graham, W. Hempel and G. Vater, and A. Sieverts iron, chromium, manganese, aluminium, and magnesium, by A. P. Lidofi copper, silver, iron, and nickel, by A. Sieverts and coworkers silver, by F. Durau sodium, copper, iron and nickel, by W. A. Dew and... 

Fluri, K., Fitzpatrick, G., Chiem, N., Harrison, D.J., Integrated capillary electrophoresis devices with an efficient postcolumn reactor in planar quartz and glass chips. Anal. Chem. 1996, 68, 4285 1290. 

Brehm, U., Gorbushina, A. A. Mottershead, D. (2005). The role of micro-organisms and biofilms in the breakdown and dissolution of quartz and glass. Paleogeography, Paleoclimatology, Paleobiology, 219, 117-29. (Published online 6 January, 2005.)... 

Since the enthalpy difference between quartz and glass is about 9 kJ/mol, and the free energy difference somewhat less than this, a (free) energy crossover at the nanoscale is expected. If one takes the surface enthalpy of quartz as 1 J/m larger than that of amorphous silica (a conservative estimate), the enthalpy crossover will occur at a surface area of 9000 m7mol (150 m/g). This crossover at a relatively small surface area is consistent with the observation that all nanosized silica samples, both natural and synthetic, are amorphous. 

Carbonyl fluoride iodide decomposes at temperatures as iow as -20 C with evolution of diiodine. It is reported to be hydrolysed by water (within thirty minutes), and is rapidly and completely absorbed by aqueous sodium hydroxide solution [1196,1751], When exposed to liquid COFI at normal temperatures, quartz and glass are reported to become coated with a yellow substance [1196]. 

The hydrogen polysulfides are yellow liquids, which from the tetra-sulfide upwards have no definite freezing points. They are labile with respect to change into sulfur and hydrogen sulfide, and decompose on contact with powdered quartz and glass, wood, or paper, or traces of basic substances the same applies to hydrogen disulfide. 

Above —20°C, COIF decomposes perceptibly with liberation of iodine. Gaseous COIF also decomposes at room temperature. Slowly hydrolyzed by water, similarly to COBrF. Absorbed completely by NaOH. Quartz and glass become coated with a yellow substance on contact with the liquid at room temperature. 

Resin composites can be classified according to filler particles as fine-particle, hybrid, microhybrid and microfilled other classifications such as flowable or packable are related to their manipulation [1-3]. Quartz and glass (several types) fillers in fine-particle composites have sizes of about 0.5 to 3 pm. Microfilled and hybrid composites contain colloidal silica particles of 0.01 to 0.02 pm diameter incorporated in the polymer matrix. The microfilled composites also contain these submicron particles in groimd 10 to 20 pm filler particles of the polymerized oligomers. The filler volume fraction for composite products varies widely from about 20% to 70%. Clinical selection of composites depends upon strength, wear resistance and esthetics needed for the particular tooth restoration. 

Salim et al. (2008) investigated oil-water two-phase flows in quartz and glass microchannels. Their pressure drop measurements were interpreted by using the homogeneous and Lockhart-Martinelli models, where the two-phase pressure drop is correlated to the pressure drop of each single phase ... 

Organometallic compounds were used to fabricate semiconductive thin films on different substrates by glow discharge polymerisation [69]. Tetramethyltin (TMT) and diethylzinc (DEZ) were deposited on several substrates such as polypropylene, Sn02, quartz and glass. The physicochemical properties of the deposited films were characterised by FTIR, XPS, SEM and X-ray diffraction. 

K. Fluri, et al.. Integrated Capillary Electrophoresis Devices with an Efficient Postcolumn Reactor in Planar Quartz and Glass Chips. Anal. Chem., 1996, 68, 4285-4290. 

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