Aqueous dispersion containing a hydrophilic metal oxide powder comprising a metal oxide and a surface modification of the metal oxide, wherein a) the metal oxide is selected from the group consisting of TiO.sub.2, ZrO.sub.2, SiO.sub.2, Al.sub.2O.sub.3, Fe.sub.2O.sub.3, Fe.sub.3O.sub.4, Sb.sub.2O.sub.3, WO.sub.3, CeO.sub.2 and mixed oxides thereof and b) the surface modification b1) comprises silicon atoms and aluminum atoms and b2) the silicon atoms are at least partly bonded to a hydrocarbon radical via a C atom and b3) the Al/Si molar ratio of the surface modification is 1:2-1:20.

Aqueous dispersion containing a hydrophilic metal oxide powder comprising a metal oxide and a surface modification of the metal oxide, wherein a) the metal oxide is selected from the group consisting of TiO.sub.2, ZrO.sub.2, SiO.sub.2, Al.sub.2O.sub.3, Fe.sub.2O.sub.3, Fe.sub.3O.sub.4, Sb.sub.2O.sub.3, WO.sub.3, CeO.sub.2 and mixed oxides thereof and b) the surface modification b1) comprises silicon atoms and aluminum atoms and b2) the silicon atoms are at least partly bonded to a hydrocarbon radical via a C atom and b3) the Al/Si molar ratio of the surface modification is 1:2-1:20.

Disclosed herein is mucin-coated silica, compositions comprising the same, and methods of promoting the aggregation and/or clearance of oral bacteria using such compositions.

Disclosed herein is mucin-coated silica, compositions comprising the same, and methods of promoting the aggregation and/or clearance of oral bacteria using such compositions.

The present invention relates to a silica aerogel blanket for ultra-high temperature, a method for producing the same, and a method for constructing the same. More specifically, the present invention provides a method for producing a silica aerogel blanket, the method capable of suppressing the generation of a bad odor during construction by including a step of heat treatment after producing a hydrophobic silica aerogel blanket so as to remove a volatile organic compound (VOC), a silica aerogel blanket produced thereby, and a method for constructing a silica aerogel blanket for ultra-high temperature, the method capable of suppressing the generation of a bad odor during the construction of the silica aerogel blanket produced by the above-mentioned production method on an ultra-high temperature piping equipment, and at the same time, preventing the loss of heat insulation performance due to moisture in the air.

The present invention relates to a silica aerogel blanket for ultra-high temperature, a method for producing the same, and a method for constructing the same. More specifically, the present invention provides a method for producing a silica aerogel blanket, the method capable of suppressing the generation of a bad odor during construction by including a step of heat treatment after producing a hydrophobic silica aerogel blanket so as to remove a volatile organic compound (VOC), a silica aerogel blanket produced thereby, and a method for constructing a silica aerogel blanket for ultra-high temperature, the method capable of suppressing the generation of a bad odor during the construction of the silica aerogel blanket produced by the above-mentioned production method on an ultra-high temperature piping equipment, and at the same time, preventing the loss of heat insulation performance due to moisture in the air.

An insulating composition containing silica particles, a resin, and a curing agent, wherein: when an aqueous solution of the silica particles having an SiO.sub.2 concentration of 3.8% by mass is heated at 121 C. for 20 hours, the amount of Na ions eluted from the silica particles is 40 ppm/SiO.sub.2 or less, especially, wherein the amount of Na ions eluted from the silica particles after the heating may be 5-38 ppm/SiO.sub.2, and, the silica particles may contain a polyvalent metal oxide so the ratio by mole of a polyvalent metal M to Si is 0.001-0.02; the mass ratio of Na.sub.2O/SiO.sub.2 in the silica particles may be 700-1,300 ppm; and the silica particles may have, on the surfaces thereof, a layer having a thickness of 0.1-1.5 nm and an Na.sub.2O/SiO.sub.2 mass ratio of 10-400 ppm, and may have an average particle diameter of 5-40 nm.

An insulating composition containing silica particles, a resin, and a curing agent, wherein: when an aqueous solution of the silica particles having an SiO.sub.2 concentration of 3.8% by mass is heated at 121 C. for 20 hours, the amount of Na ions eluted from the silica particles is 40 ppm/SiO.sub.2 or less, especially, wherein the amount of Na ions eluted from the silica particles after the heating may be 5-38 ppm/SiO.sub.2, and, the silica particles may contain a polyvalent metal oxide so the ratio by mole of a polyvalent metal M to Si is 0.001-0.02; the mass ratio of Na.sub.2O/SiO.sub.2 in the silica particles may be 700-1,300 ppm; and the silica particles may have, on the surfaces thereof, a layer having a thickness of 0.1-1.5 nm and an Na.sub.2O/SiO.sub.2 mass ratio of 10-400 ppm, and may have an average particle diameter of 5-40 nm.

A colloidal dispersion of particles of silica having a particle size of from 3 nm to 100 nm, to which ions of one or more metals are adsorbed, selected from metals having atomic numbers 21-31, 39-46, 48-50, 57-82, and 89-93, and a method for preparing the dispersion. The dispersion may be used in various fields of use of metals.

A colloidal dispersion of particles of silica having a particle size of from 3 nm to 100 nm, to which ions of one or more metals are adsorbed, selected from metals having atomic numbers 21-31, 39-46, 48-50, 57-82, and 89-93, and a method for preparing the dispersion. The dispersion may be used in various fields of use of metals.