High-Silica Glasses

Alternatively, helium may be separated from natural gas by diffusion through permeable barriers, such as high silica glass or semipermeable membranes. The gas is supplied commercially in steel cylinders or tanks. The United States is the largest producer of helium in the world. 

Nogami M. and Tomozawa M. (1984a) Diffusion of water in high silica glasses at low temperature. Phys. Chem. Glasses 25, 82-85. 

Effect of heat-treatment on density and constitution of high-silica-glasses of the borosilicate type. J. Am. Ceram. Soc. 31, 177 — 186 (1948). 

Sample Solution A Fuse 1 g of sample, accurately weighed, with 10 g of sodium bisulfate, NaHSCVL O, contained in a 250-mL high-silica glass Erlenmeyer flask. 

Silicon Dioxide Fuse 1 g of sample, accurately weighed, with 10 g of sodium bisulfate, NaHS04H20, contained in a 250-mL high-silica glass Erlenmeyer flask. While swirling the flask, heat it gently over a Meker burner until decomposition and fusion are complete and the melt is clear, except for the silica content, and then cool. 

Properties of sodium sulfate help speed up the melting process in glassmaking. Its use reduces the tendency for alkaline gas bubbles to form in the glass and provides a less expensive form of Na20 than soda ash (6). Sodium sulfate improves the working properties of high silica glasses. 

High-silica glass 1000 Excellent More resistant to alkalis than borosilicate Similar to fused quartz Trademark Vycor (Coming)... 

A process was developed that is capable of transforming poorly durable sodium silicate glasses (12 to 21% Na20) into durable high silica glasses. Sodium hydrosilicates with up to 40%... 

Determine (a) the Voigt and (b) the Reuss bounds to the modulus of elasticity of a ceramic material consisting of layers of alumina and a high-silica glass. The... 

Borosilicate 1723 Aluminosilicate 7930 High silica Glass-ceramics LAS-1... 

Figure 10-3 shows the basic features of a hollow cathode lamp source. Here A is the anode (the plus electrode) and C is the cathode, terminated in the lamp as a hollow cup. The anode can be a wire, such as tungsten, and the cathode cup may be constructed from the element whose spectrum is desired or it may be an inert material into which the desired element or a salt of the desired element is placed. The lamp envelope is made of glass and IT is a window of suitable properties. If an ultraviolet line spectrum is desired, the window may be quartz or a high silica glass. The hollow cathode has an inert gas present, usually neon or argon, at low pressure. 

Simmons JH, Macedo P B, Barkatt A, Litovitz TA (1979) Fixation of radioactive waste in high silica glasses. 

The radius of curvature of the silica-water interface is of critical importance even with a porous silica solid. Charles (170) found that the rate of dissolution of porous high silica glass could be explained on the basis of a high local solubility of the silica surface owing to its small radius of curvature. 

PROSEP-A High High silica glass Protein A n.a. 

PROSEP-RemTox High silica glass Synthetic small ligand n.a. 

PROSEP-Thiosorb High silica glass Thiol n.a. 

PROSEP-Heparin High silica glass Heparin n.a. 

---