Melt glass surface area

Table III. Melt Glass Surface Area and Size Analysis...

The microstructure of monoliths is important particularly with ceramic monoliths when the chemical nature and structure of the crystalline and glass phases, together with the pore structure, determine the thermal expansion, thermal conductivity, melting point, surface area, and strength of the... 

A homogeneous glass mass containing 25 - 60% by volume of gas inclusions is produced in the SCM. The melting temperature reaches about 1600°C. The specific productivity of about 15 tons of melt per 1 m of melt flee surface was reached for SCMs with a working volume of 4 - 8 m and a melt free surface area of 2 - 4 m. ... 

For the areas that do have sufficiently low-cost electric power, the furnaces are constructed with conventional bottoms hut with superstructure only adequate lor initial heat-up. They depend on a blanket of hatch floating on the surface of ihe glass to retain the heat within the tank that is provided by the submerged electrodes. Fresh batch is added to the blanket at a rate equal to the rate of melted glass withdrawn. 

Core-drilled samples were taken from the in-pot melting glass canisters after the canisters had been stored almost three years and had received 1 X 10 rad or more of radiation. Leach data from the core-drilled samples are shown to bracket the nonradioactive control data in Figure 6. Differences in leach rate of the magnitudes shown are within experimental deviation these differences which are believed to be associated mainly with difficulty in determing surface areas accurately. The shape of the radioactive and nonradioactive leach rate curves for the... 

By definition, the intrinsically high surface area of gels requires that gases are accessible to a substantial portion of the solid phase. For example, in a gel with a Brunauer-Emmett-Teller (BET) surface area of 850 m2/g, 65% of the silicon atoms are on a surface. The accessibility of the surface makes gas- or liquid-phase reactions a viable means of bulk compositional modification. This situation has been exploited by numerous researchers who have reacted silicate xerogels with ammonia to form oxynitride glasses without melting (105-107). 

The smaller the fiber diameter used in the prefilter, the greater the surface area for adsorption of particles and the better the retention of small particles. In the sixties, asbestos fibers were recognized as the best prefilter media. The individual fibrils were smaller than 0.01 ju and they had a positive zeta potential. However, when it was suspected that asbestos fibers presented a health hazard, fine diameter glass and synthetic polymer fibers were substituted. Unfortunately, neither media equals the performance of asbestos. Glass fibers are available in the finest diameters, but some users are fearful they may represent a similar health hazard. The trend has been to use polypropylene or polyester fiber prefilters. Melt blown or spun-bonded fibers are available in diameters near 1 ju. Multilayers of these media with appropriate calendering have resulted in surprisingly efficient prefilters. 

The initial burst was further decreased by tiie fact that upon the addition of the hydrophilic additive, the glass transition temperature of the PGLA decreases from 42.5°C to 36.7°C. This allows annealing of the PLGA molecules to take place upon subcutaneous administration (where tire ambient temperature is 37°C). This annealing process causes tire initial porous structures of tire microcapsules to disappear and allows "melted" microcapsules to fuse with each other. A decreased number of surface pores and a decreased surface area to volume ratio serves to limit tire release of insulin from tire annealed microparticles. ... 

The lower part of the screen is then moved into the press and the upper part is applied to compress the preform, using hot air to melt the binder. The cycle time depends on the maneuverability of the robot, preforms area, part complexity, and required glass load. The maximum capacity for the chopper is in the range of 3 kg/min but, on complicated shapes and narrow corners, the robot must work more slowly to deposit the glass evenly. Time required to consolidate the fibers is very short (less than 30 s), irrespective of surface area and glass load. 

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