Abstract: The present invention relates to a method for preventing or reducing contamination of a surface of a substrate, or protecting a surface of a substrate by making a surface of a substrate hydrophilic, by means of arranging, successively in relation to the substrate, a first layer containing a negatively-charged substance, and a second layer containing a positively-charged substance or containing a positively-charged substance and a negatively-charged substance on the surface of the substrate or in a surface layer of the substrate. In accordance with the present invention, a novel method for preventing or reducing adhesion of contaminants, and color degradation or color change of a substrate over time, can be provided.

Abstract: The present invention relates to an agent for increasing an amount of visible light transmitted by a light-transmissive substrate containing an organic silicon compound and an inorganic silicon compound, and a process for producing a highly light-transmissive substrate using the aforementioned agent for increasing an amount of transmitted visible light, as well as, a process for increasing an amount of visible light transmitted by a light-transmissive substrate characterized by forming a layer containing an organic silicon compound and inorganic silicon compound on the surface of a light-transmissive substrate.

Abstract: A method for removing negatively-charged gas molecules includes the steps of: adsorbing negatively-charged gas molecules by a substrate carrying a positively-charged substance or a positively-charged substance and a negatively-charged substance on the surface of the substrate or in a surface layer of the substrate; and desorbing the aforementioned negatively-charged gas molecules adsorbed on the aforementioned substrate, from the substrate using a fluid. According to the present invention, negatively-charged gas molecules are removed or detoxified by adsorbing the same by a substrate carrying a positively-charged substance, or a positively-charged substance and a negatively-charged substance, on the surface of the substrate. Thereby, it is possible to provide a simple process by which negatively-charged gas molecules are able to be effectively and economically removed or detoxified.

Abstract: The present invention provides a novel method for preventing or reducing color degradation or color change of a substrate over time, and is characterized by arranging at least one positively-charged substance selected from the group consisting of (1) a positive ion; (2) a conductor or dielectric having a positive charge; and (3) a composite formed from a conductor and a dielectric or a semiconductor, on a surface of a substrate, and arranging an insulating organic or inorganic substance on the aforementioned positively-charged substance.