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Naganawa, Hirochika
no journal, ,
Liquid-liquid extraction (solvent extraction) is a method for extracting a target component from an aqueous solution into an organic solvent immiscible in water, which is very popular in industry especially in metal refining. In the emulsion flow extractor, the flow of an emulsion, which is a fine mixture of aqueous and organic phases, arises by generating micrometer-sized liquid droplets with a nozzle head, and the emulsion flow then promptly disappears by itself with a drastic change of the cross-section area of its passing in the extractor vessel structure. In short, aqueous and organic phases can be effectively mixed to an emulsified condition and then these two liquid phases can be quickly separated to their perfectly clear condition by only sending liquids. Therefore, the emulsion flow extractor is markedly low-cost and simple compared with conventional apparatuses (mixer-settler, etc.) despite showing the highest performance.
Serizawa, Hiroyuki
no journal, ,
My investigation on cavities in ceramics was triggered by the unexpected discovery of a polyhedral cavity in a UO
matrix. The SEM image that attracted my attention was a cavity observed in the fracture surface of a single-crystal of UO that was heat-treated in helium at 90 MPa, followed by annealing at high temperature for 1 h. The cavity was the so-called negative crystal which is sometimes seen in a broken mineral casually. The negative crystal was formed by the precipitation of helium during heat treatment after Hot Isostatic Pressing (HIP) injection. In a series of experiments, I noticed that the shape of the negative crystal changes depending on the heat-treatment history. We also confirmed that nanosized image crystals can be formed in CeO matrix.