FACTORS INFLUENCING PILLARING

The elution chart for impurities of crystals and mother liquid obtained from a Protein Column 1-125 are presented in Figure 4. There was no difference other than peak A between the pillar form and the thin plate form crystals. Although the amount of peak A detected in the mother liquid of the thin plate form crystals was almost the same as that in the mother liquid of the pillar form crystals, peak A was detected only in the thin plate form crystals. The location of peak A was close to that of L-phenylalanine, so this compound must have characteristics similar to those of L-phenylalanine. Thus, peak A might be one of the factors which affect the change from pillar form to thin plate form crystals. Future studies should be performed to identify the structure of peak A substance and clarify the influence of this substance on the change in the crystal appearance. 

There is stress concentration in point pillar and the point pillar supports upper ore body to a certain extent. As mining space of chamber increases, concentration factor of internal stress of point pillar gradually decreases and supporting role of point pillar for upper ore body becomes weaken gradually. Influenced by disturbance of chamber mining, all the point pillars turn into plastic state and the failure is shear combined failure along strike of ore deposit. 

Six of the eleven chapters are devoted primarily to the intercalation chemistry of smectite clays, the most versatile among all lamellar compounds. Two of these chapters are devoted to the experimental and theoretical aspects of the clay structures and surface chemistry, including chemical catalysis. Organo clays and polymer-clay nanocomposites, the adsorption of nitroaromatic compounds of environmental significance onto clay surfaces, photochemical processes, and pillared clays and porous clay heterostructures are the subjects of the remaining four chapters. These six chapters provide detailed discussions of the factors that influence access to the intragallery surfaces of the clay host and the materials properties of the resulting intercalates. 

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