摘要:
A method of forming an optically clear, thin metal oxide, porous layer on a vitreous glass substrate, with this metal oxide layer having a low index of refraction. A clear colloidal solution is prepared using metal alkoxide and the substrate is dipped in this solution. The concentration of metal oxide equivalent in the solution, and the rate of withdrawal of the glass substrate from the solution are controlled to form the porous metal oxide layer on the substrate with the layer being about a quarter-wavelength optically thick. This low index of refraction metal oxide layer forms an effective antireflective layer on a vitreous substrate of higher index of refraction, and minimize reflection from the substratemetal oxide layer interface.
摘要:
A transparent, activated, nonparticulate alumina with a total porosity of about 63% which consists of a unique pore morphology and size distribution and is thermally stable up to about 1,200.degree.C. at which temperature it can be nondestructively converted to alpha alumina is disclosed as well as a method of preparing said alumina by hydrolyzing aluminum alkoxides to form a particular sol which is essentially clear to the naked eye and the gel of which retains its integrity during drying and pyrolysis. The alumina thus produced is useful as a catalyst, absorbent and desiccant. In addition, a method of preparing the intermediate clear colloidal sol or gel consisting essentially of aluminum monohydrate is disclosed. This intermediate can be used to coat various substrates.
摘要:
A transparent, activated, nonparticulate alumina with a total porosity of about 63% which consists of a unique pore morphology and size distribution and is thermally stable up to about 1200.degree.C. at which temperature it can be nondestructively converted to alpha alumina is disclosed as well as a method of preparing said alumina by hydrolyzing aluminum alkoxides to form a particular sol which is essentially clear to the naked eye and the gel of which retains its integrity during drying and pyrolysis. The alumina thus produced is useful as a catalyst, absorbent and desiccant. In addition, a method of preparing the intermediate clear colloidal sol or gel consisting essentially of aluminum monohydrate is disclosed. This intermediate can be used to coat various substrates.