IntroductionTitanium dioxide with the rutile or the anatasestructure as,in principle,a white pigmentis widelyused as paints and plastic additives because of itshigh refractive index,oil adsorption,chemical orthermal stability[1— 4 ] .The most common manu- fac-ture of this material is based on the digestion of theore ilmenite(Fe O· Ti O) with sulfuric acid,fol-lowed by hydrolyzing the solution of titanium ionsand the calcination of the hydrous titanium ox-ides[5] .Another industrial prepara… 相似文献
A novel organic/inorganic hybrid honeycomb patterned porous thin film was prepared using the breath‐figure method combined with a sol‐gel process. An in situ formed gelable block copolymer, formed by mixing poly(styrene‐alt‐maleic anhydride)‐block‐polystyrene (P(St‐a‐MAn)‐b‐PS) and 3‐aminopropyltrimethoxysilane (APS), was used as the structure directing agent. The porous film produced was dipped into an acid aqueous solution to induce a sol‐gel process in the wall of film. As a result of gelation, the structure of this film transformed into a crosslinked silica oxide hybridized with PS, and this film resisted those organic solvents which were once good solvents for the copolymer precursor.
ABSTRACTA nano-Mn3B7O13Cl crystal was synthesized by a sol–gel method, and the structure, morphology and size were characterized by X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy. Effects of gamma radiation on the microstructure, luminescence properties, and medical performance for Mn3B7O13Cl have been discussed. The results show that Mn3B7O13Cl nanocrystals are uniform, and the average crystal size is about 50?nm. Under the 202?Gy measurement of gamma-ray irradiation, there are a large number of crystal defects in a chambersite crystal, and the defect is given priority with point defects and dislocations especially in gamma-ray irradiation with high energy. The luminescence intensity of natural chambersite in red light wavelengths increased obviously, and the luminescence intensity increased by 3.5 times. Nano-Mn3B7O13Cl exhibited the most significant antitumor activity and antiseptic effects. The best inhibition concentration of natural chambersite to A549 is 100?µg/ml, and its inhibition rate reaches 80%. Addition of natural chambersite in the solution significantly lowers the concentrations of Escherichia coli BL21, and the value is reduced by 97.6%. Therefore, chambersite has important application in the field of medical and shielding materials. 相似文献