One aspect is a method for producing a multilayered silica glass body. The method involves producing a multilayered silica glass body in which a transparent silica glass layer is provided on the surface of a siliceous substrate made of a siliceous material. The method includes preparing the siliceous substrate, preparing a silica slurry in which silica particles are dispersed in a liquid, applying the silica slurry to the surface of the siliceous substrate, leveling the silica slurry applied to the surface of the siliceous substrate by applying vibration to the siliceous substrate, drying the leveled silica slurry, and vitrifying the dried silica slurry by heating to form a transparent silica glass layer. As a result, a transparent silica glass layer of uniform thickness is obtained at excellent yield, and a method for producing a multilayered silica glass body easily in a short time is provided.

One aspect is a method for producing a multilayered silica glass body. The method involves producing a multilayered silica glass body in which a transparent silica glass layer is provided on the surface of a siliceous substrate made of a siliceous material. The method includes preparing the siliceous substrate, preparing a silica slurry in which silica particles are dispersed in a liquid, applying the silica slurry to the surface of the siliceous substrate, leveling the silica slurry applied to the surface of the siliceous substrate by applying vibration to the siliceous substrate, drying the leveled silica slurry, and vitrifying the dried silica slurry by heating to form a transparent silica glass layer. As a result, a transparent silica glass layer of uniform thickness is obtained at excellent yield, and a method for producing a multilayered silica glass body easily in a short time is provided.

The present disclosure provides a method for preparing hollow glass microbeads coated with graphene oxide, which includes: dispersing graphene oxide into deionized water, to form an aqueous graphene oxide solution; placing hollow glass microbeads into the aqueous graphene oxide solution, to achieve a dispersion liquid; and simultaneously performing an ultrasonic vibration treatment and a drying treatment to the dispersion liquid, to achieve the hollow glass microbeads coated with the graphene oxide. Through simultaneously performing the ultrasonic vibration treatment and the drying treatment to the dispersion liquid, the graphene oxide is uniformly coated on the surface of the hollow glass microbeads, and thus the surface properties of the hollow glass microbeads are maintained, because no other additives such as adhesives are required.

Techniques for drying and crystallizing a film of crystalline material, such as a perovskite, from a solution are disclosed.