To provide modified colloidal silica capable of improving the stability of the polishing speed with time when used as abrasive grains in a polishing composition for polishing a polishing object that contains a material to which charged modified colloidal silica easily adheres, such as a SiN wafer, and to provide a method for producing the modified colloidal silica. Modified colloidal silica, being obtained by modifying raw colloidal silica, wherein the raw colloidal silica has a number distribution ratio of 10% or less of microparticles having a particle size of 40% or less relative to a volume average particle size based on Heywood diameter (equivalent circle diameter) as determined by image analysis using a scanning electron microscope.

A method comprising providing a sol comprising a solvent; contacting the sol with a precipitation initiator to initiate precipitation of the sol, wherein the precipitation initiator is different to the solvent; and applying the precipitating sol to a product. The methods of the invention may be used with sols comprising a solvent, a metal alkoxide, and optionally a biopolymer and/or a catalyst, with alkoxides comprising metals, organically modified alkoxides comprising metals, alkoxides comprising metalloids, and organically modified alkoxides comprising metalloids all being encompassed by the term ‘metal alkoxide’. Also disclosed is an apparatus for use in the method comprising a first storage vessel; a second storage vessel; one or more pumps; and one or more delivery means.

The present application provides a heat exchanger and a manufacturing method of a heat exchanger. The heat exchanger includes a metal substrate, the metal substrate has a fluid channel for circulating a heat exchange medium; and the heat exchanger further includes a coating, the coating includes resin, silica and titanium dioxide, and the coating is arranged to cover at least part of a surface of the metal substrate. Silica particles and titanium dioxide particles are conducive to the formation of a complex micro-nano structure, and leveling and stability of hydrophilic resin contribute to long-term maintenance of the micro-nano structure. The coating of the heat exchanger according to the present application has excellent hydrophilic durability.

The present invention relates to a method for producing an aerogel blanket exhibiting excellent hydrophobicity at high temperatures and an aerogel blanket produced thereby. The present invention uses a mixture of silica sol and a hydrophobic aerogel powder as an aerogel precursor and thus can achieve hydrophobicity in the internal structure as well as on the surface of the aerogel included in the aerogel blanket. Accordingly, the aerogel blanket can attain high hydrophobicity and thus can exhibit excellent hydrophobicity retention ability even in high-temperature applications.

The present invention relates to a method for producing an aerogel blanket exhibiting excellent hydrophobicity at high temperatures and an aerogel blanket produced thereby. The present invention uses a mixture of silica sol and a hydrophobic aerogel powder as an aerogel precursor and thus can achieve hydrophobicity in the internal structure as well as on the surface of the aerogel included in the aerogel blanket. Accordingly, the aerogel blanket can attain high hydrophobicity and thus can exhibit excellent hydrophobicity retention ability even in high-temperature applications.

The present disclosure relates to a device for producing an aerogel blanket, and a method for producing an aerogel blanket. The device for producing an aerogel blanket according to present disclosure is a device for producing an aerogel blanket, including a supply part, which supplies a fiber containing sol, and a conveyor belt which moves the fiber supplied from the supply part, wherein the conveyor belt is provided in multiple levels to move the fiber while reversing the fiber, and a start time at which the conveyor belt reverses the fiber is before fluidity of the sol is completely lost.

The present disclosure relates to a device for producing an aerogel blanket, and a method for producing an aerogel blanket. The device for producing an aerogel blanket according to present disclosure is a device for producing an aerogel blanket, including a supply part, which supplies a fiber containing sol, and a conveyor belt which moves the fiber supplied from the supply part, wherein the conveyor belt is provided in multiple levels to move the fiber while reversing the fiber, and a start time at which the conveyor belt reverses the fiber is before fluidity of the sol is completely lost.

A device and method for preparing an aerogel blanket, are described. The device for preparing an aerogel blanket includes: a first transport means configured to transport a blanket substrate; a first spray means configured to spray a sol to the blanket substrate on the first transport means; a second transport means arranged downstream of the first transport means and configured to transport the blanket substrate sprayed with the sol; and a second spray means configured to spray a gel catalyst to the blanket substrate on the second transport means. The device and the method for preparing a aerogel blanket can improve the preparation efficiency of the aerogel blanket.

A device and method for preparing an aerogel blanket, are described. The device for preparing an aerogel blanket includes: a first transport means configured to transport a blanket substrate; a first spray means configured to spray a sol to the blanket substrate on the first transport means; a second transport means arranged downstream of the first transport means and configured to transport the blanket substrate sprayed with the sol; and a second spray means configured to spray a gel catalyst to the blanket substrate on the second transport means. The device and the method for preparing a aerogel blanket can improve the preparation efficiency of the aerogel blanket.

Embodiments of the disclosure provide an asymmetrically functionalized nanoparticle and a method for synthesizing the same. The asymmetrically functionalized nanoparticle includes a base nanoparticle. The base nanoparticle can include silicon dioxide. The base nanoparticle can have a lipophilic surface. A portion of the surface can be functionalized with a functionalizing material forming a hydrophilic portion. The functionalizing material can include polyethylenimine. A remaining portion of the surface is not functionalized forming a lipophilic portion. The asymmetrically functionalized nanoparticle is amphiphilic.