초록

A protective monolayer is formed on e.g. silica gel and glass surfaces comprising a monolayer of silicon and oxygen atoms which is substituted with first and second hydrocarbyl substituents.

대표청구항 ▼

[ What is claimed is:] [1.] A product comprising a substrate to which is chemically bonded a monolayer of silicon atoms which are connected to other silicon atoms in said monolayer through oxygen atoms in said monolayer, wherein the surface of said substrate comprises an inorganic element or oxide t

[ What is claimed is:] [1.] A product comprising a substrate to which is chemically bonded a monolayer of silicon atoms which are connected to other silicon atoms in said monolayer through oxygen atoms in said monolayer, wherein the surface of said substrate comprises an inorganic element or oxide thereof, which is capable of forming a bond to silicon atoms in said monolayer, and wherein the monolayer is substituted with first and second hydrocarbyl substituents and each of the silicon atoms in said monolayer is substituted with said first hydrocarbyl substituent or said second hydrocarbyl substituent, wherein said first hydrocarbyl substituent is longer than said second hydrocarbyl substituent, and wherein the density of said hydrocarbyl substituents is at least 7 micromoles per square meter of substrate surface,wherein said product is formed by hydrating the surface of said substrate to form on said surface a monolayer of water, and then reacting said hydrated surface with silanes of the formulas R.sup.1 SiX.sub.3 and R.sup.2 SiX.sub.3, wherein R.sup.1 and R.sup.2 are hydrocarbyl substituents and X is a leaving group, provided that R.sup.1 is longer than R.sup.2, under conditions under which said silanes react at said surface and form said monolayer of silicon atoms,wherein said inorganic element is selected from the group consisting of Al, Zr, P, Be, Mg, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Rb, Sr, Y, Nb, Mo, Ru, Rh, Pt, Au, Ag, Tl, Pb, and Bi.