The present invention relates to a process for preparing waterglass-based silica aerogels, wherein the process comprises (a) subjecting a certain amount of a vinyltrialcoxysilane to hydrolysis in the presence of water and an inorganic acid under stirring conditions to produce a hydrolyzed vinyltrialcoxysilane solution; (b) treating a waterglass solution with an acidic cationic-exchange resin to produce a silicic acid solution; (c) forming a sol phase by contacting the hydrolyzed vinylalcoxysilane solution with the silicic acid solution; (d) forming a gel phase by adjusting the pH of the sol phase to a value in the range of from 4 to 6; and (e) subjecting the gel phase to supercritical drying to produce an aerogel. The present invention is also related to waterglass-based silica aerogels obtained by the process according to the invention, which are functionalized with vinyl groups.

A method of manufacturing an argyrodite-type solid electrolyte, an argyrodite-type solid electrolyte, and an all-solid-state battery including the argyrodite-type solid electrolyte are provided. The method includes a first step of adding precursors represented by the following Formulas 1 and 2 into a polar aprotic solvent, followed by stirring to obtain a reaction solution; a second step of adding P.sub.2S.sub.5 into the stirred reaction solution, followed by further stirring to form a precipitate obtained as a result of the reaction in the reaction solution; and a third step of drying and heat-treating the reaction solution in which the precipitate is formed to obtain a solid electrolyte: [Formula 1] A.sub.2S [Formula 2] AX wherein A represents an alkali metal, and X represents an element of the halogen group.

A negative electrode active material includes: particles of negative electrode active material, the particles of negative electrode active material contain particles of silicon compound containing a silicon compound (SiO.sub.x:0.5≤x≤1.6); the particles of silicon compound contain at least one kind or more of Li.sub.2SiO.sub.3 and Li.sub.4SiO.sub.4; the particles of negative electrode active material contain Li.sub.2CO.sub.3 and LiOH on a surface thereof; and a content of the Li.sub.2CO.sub.3 is 0.01% by mass or more and 5.00% by mass or less relative to a mass of the particles of negative electrode active material and a content of the LiOH is 0.01% by mass or more and 5.00% by mass or less relative to the mass of the particles of negative electrode active material. Thus a negative electrode active material is capable of improving initial charge/discharge characteristics and the cycle characteristics when used as a negative electrode active material of the secondary battery.

Set forth herein are processes for making lithium-stuffed garnet oxides (e.g., Li.sub.7La.sub.3Zr.sub.2O.sub.12, also known as LLZO) that have passivated surfaces comprising a fluorinate and/or an oxyfluorinate species. These surfaces resist the formation of oxides, carbonates, hydroxides, peroxides, and organics that spontaneously form on LLZO surfaces under ambient conditions. Also set forth herein are new materials made by these processes.

The invention relates to a process for performing a aqueous synthesis of titanium phosphates (TiP) having solely —H2PO4 groups, which process is characterised by the following steps: providing titanium (IV) oxysulphate, TiOSO4, in an aqueous solution or in a powder and H2SO4, substantially without transition divalent metal ions, including cobalt (II) and copper (II), heating N of the thus formed aqueous solution to above 50° C., but below 85° C. for at least 30 minutes, providing a controlled amount of H3PO4 to said aqueous solution, to form an aqueous solution containing a molar ratio between TIO2 and P2Os being controlled to about 1:1, pot not above 1:1.5 and not below 1:0.7, stirring the thus formed aqueous solution for at least 3 hours to form precipitates of titanium Got phosphate, and allowing ageing of said solution, without stirring, acidic washing of the formed precipitate using HCl or other acids to obtain TiO(OH)(H2PO4)-H2O having solely —H2PO4 ion-exchange chemical groups and allowing said precipitates to dry to a powder product, substituting protons in the powder product TiO(OH)(H2PO4)-H2O to sodium cations by treatment of the latter with solutions of sodium carbonate and allowing the thus formed powder of Na—TiP1 to dry.

The present invention relates to a graphene transistor comprising: a substrate; a graphene channel layer arranged on the substrate; a pair of metals spaced from each other and respectively arranged at opposite ends of the graphene channel layer; and a linker layer arranged on the graphene channel layer and including an N-heterocyclic carbene compound, a fabrication method therefor, and a biosensor comprising the same. The graphene transistor according to the present invention in which the carbene group of the N-heterocyclic carbene compound forms a covalent bond with the graphene channel layer to modify the whole surface of the graphene channel layer exhibits excellent electric conductivity as a transistor and a biosensor comprising the transistor is improved in selectivity and sensitivity.

The invention discloses a calcium-alumino-silicate-hydrate nano-seeds suspension and preparation method thereof. The preparation method of calcium-alumino-silicate-hydrate nano-seeds suspension includes the following steps: dropwise adding the aqueous solution of calcium source, the aqueous solution of silicon source and the aqueous solution of aluminum source to the solution of polycarboxylate superplasticizer, and adjusting the pH value to 10.0˜13.5, and continuously stirring to obtain the calcium-alumino-silicate-hydrate nano-seeds suspension. The beneficial effect in the present invention is: the calcium-alumino-silicate-hydrate nano-seeds has small particle size, good dispersion stability, and it can effectively improve the early hydration and mechanical performance of cement-based materials, and has good application prospects; the preparation process is simple, without washing, drying, ultrasonic dispersion and other subsequent processes, suitable for large-scale production.

Problem: To provide highly water-repellent layered silicate-coated silica particles with higher safety.

Solution: A layered silicate-coated body has a silica particle, a saponite-like layered silicate derivative coating at least part of the silica particle, and a hydrophobic functional group introduced to the silica particle and/or the layered silicate derivative.

The present disclosure is directed to novel germanosilicate compositions and methods of producing the same. In particular, this disclosure describes new silica-rich compositions of the germanosilicate designated CIT-13, with and without added metal oxides. The disclosure also describes methods of preparing and using these new germanosilicate compositions as well as the compositions themselves.

The present disclosure is directed to novel phyllosilicate compositions designated CIT-13P and methods of producing and using the same.