Abstract:
Process for the preparation of quasi-crystalline boehmite comprising the steps of: (a) preparing an aqueous precursor mixture comprising a water-insoluble aluminium source; (b) decreasing the pH of the precursor mixture of step (a) by at least 2 units; (c) increasing the pH of the mixture of step (b) by at least 2 units, and (d) aging the mixture of step (c) under hydrothermal conditions to form a quasi-crystalline boehmite. This process provides for the hydrothermal preparation of quasi-crystalline boehmites with high peptizability. The invention therefore further relates to quasi-crystalline boehmites with a high peptizability, measured as the Z-average submicron particle size. This Z-average submicron particle size preferably is less than 500 nm, more preferably less than 300 nm, even more preferably less than 200 nm, and most preferably less than 100 nm.
Abstract:
The invention relates to controlled preparation of fine particles such as nano-crystalline films and powders with at least one solvent being in a supercritical state. It provides methods, measures, apparatus and products produced by the methods. In other aspects the invention relates to further treatment of formed particles such as encapsulation of formed primary particles, and methods and measures for collection of formed substances in a batch wise, semi-continuous or continuous manner.
Abstract:
An environmental friendly process for the production of finely divided calcium carbonate suitable for industrial application from calcium carbonate rich by-product of nitrophosphate fertiliser plant by adopting purification steps of thermal treatment, pulverization and coating using emulsion of fatty acid or its derivatives.
Abstract:
A zinc oxide powder having a suppressed photocatalytic activity and prepared by coating a zinc oxide powder with at least one silicone compound in a nongaseous state and firing the coated zinc oxide powder in an oxidizing atmosphere at a temperature of 600 to 950 DEG C. A cosmetic preparation comprising this zinc oxide powder is excellent in touch, sebum resistance, and protection against ultraviolet light.
Abstract:
A fumed silica having an average aggregate size of less than .09 mu m, a bulk density greater than 2.5 lbs/ft and is characterized by its destructured nature. Also disclosed is a polyolefin composition of high clarity containing an effective amount of fumed silica made in accordance with the present invention.
Abstract translation:平均聚集体尺寸小于0.9μm,体积密度大于2.5lbs / ft 3的热解法二氧化硅,其特征在于其结构性质。 还公开了一种高透明度的聚烯烃组合物,其含有根据本发明制备的有效量的气相二氧化硅。
Abstract:
A low-temperature synthesis of M PS3 (M preferably Fe, Co or Ni) comprises mixing M cation with P2S6 anion; if insoluble, M PS3 precipitates; otherwise, M cation can be supplied off an M - cation-exchange resin through which Na4P2S6 solution is trickled. The product is X-ray amorphous, and is brought to a desirable degree of partial order by heating at 350 C for 3 hours. In this form it can reversibly intercalate lithium and, mixed with binder and graphite, is a cathode for a lithium rechargeable cell.
Abstract:
본 발명은 질화알루미늄 분말 제조 방법에 관한 것이다. 보다 상세하게는, 본 발명은 (i) 알루미나 분말을 시안화합물과 함께 소성시키는 단계; 및 (ii) 상기 (i)단계의 생성물로부터 탄소를 제거하는 단계를 포함하는 질화알루미늄 분말 제조 방법에 대한 것이다.