11 results about "Silica matrix" patented technology

a kind of sp 2 C covalent organic framework functionalized silicon-based chromatographic stationary phases, their preparation methods, and applications. Preparation steps: (1) Preparation of SiO2-NH2: Aminated activated spherical silica particles are prepared using an amino-containing silane coupling agent; (2) SiO2@sp 2 C-COF preparation: Using TMT and TFPT as raw materials, sp was obtained through a Schiff base-mediated aldehyde-alcohol condensation reaction initiated by a self-assembled monolayer auxiliary surface. 2 A C covalent organic framework is loaded onto the surface of a silica matrix via C=N bonds. 2 C-COF possesses an in-plane π-conjugated, highly ordered, and robust framework structure. Its unique hydrophilic covalent triazine groups and hydrophobic benzene rings can provide various interactions such as hydrophobicity, π-π stacking, hydrogen bonding, and hydrophilicity. This enables the stationary relative shape-restricted and geometric isomers to exhibit special selectivity and separation capabilities, overcoming the instability of common imine-bonded COFs in liquid chromatography (HPLC) and the limited selectivity of relatively shape-restricted and geometric isomers stationed in traditional bonded silica gel.

The invention discloses environment-friendly multifunctional gradient response allochroic silicagel and a preparation method thereof, and belongs to the technical field of allochroic silicagel. The allochroic silica gel comprises a silica gel substrate with a mesoporous-microporous two-stage pore channel structure, an organic-inorganic hybrid fluorescent allochroic indication system loaded on the inner wall of a pore channel of the substrate, and a super-hydrophobic protection layer covering the surface of a particle. According to the invention, a two-stage pore channel structure is constructed by adopting a double-template-agent synergistic self-assembly method, water molecule transmission is accelerated by utilizing a mesoporous channel, and high adsorption capacity and quick response are realized by virtue of a synergistic effect of adsorption sites provided by a microporous structure. The organic indicator is covalently anchored to a silica gel skeleton by adopting the silane coupling agent, so that dual humidity indication of visible light high-contrast discoloration and fluorescence multi-stage gradient response is realized. A super-hydrophobic protection layer is constructed on the particle surface through a fluidized bed vapor deposition method, and the intelligent protection effect of air permeability and water impermeability is achieved. The product does not contain harmful substances such as cobalt, and is environment-friendly, safe and excellent in cycling stability.

The application discloses a kind of nano fluorescent probes SiO2@Tb in detecting Fe 3+ In aspect application.Nano fluorescent probes SiO2@Tb Fluorescence emission of silica matrix as reference, characteristic emission fluorescence of rare earth terbium ion is quenched by Fe 3+ Ratiometric fluorescent probe is constructed, with self-reference characteristics, which can effectively reduce system error, with high selectivity and sensitivity, strong anti-interference ability, low detection environment requirement, high accuracy, and low detection limit, only 0.0752 μM;Simple instrument and equipment, easy to operate, with potential application prospect.

The application discloses a preparation method of carbon dot@silica long-life phosphorescent nanocomposites with adjustable particle size, and relates to the technical field of new materials, aiming at solving the problem that there is no method which is simple in steps, green and cheap in raw materials and easy to control in small size range, and simultaneously providing new multi-heteroatom doping expansion; the application comprises the following steps: adopting epichlorohydrin as a chlorine source and an oxygen source, adopting ethylenediamine as a nitrogen source, and preparing N / O / Cl heteroatom carbon dot materials through one-step hydrothermal method; then, tetraethyl orthosilicate is used to provide a silica matrix, and the prepared carbon dot materials are coated; in the coating process, the pH condition is adjusted to realize the control of the particle size of the product within 0-20nm, and the particle size is negatively correlated with the pH value; the preparation method is simple, the raw materials are novel, cheap and green, the product has good water dispersibility, the product has excellent and stable photochemical characteristics, and has wide application prospect.

An anode material for a secondary cell, characterized in that the anode material comprises a silicon dioxide matrix having carbon-encapsulated metal-doped silicon nanoparticles; a method to produce said anode material; an anode comprising said anode material; a secondary cell comprising said anode; and a vehicle comprising said secondary cell.

The invention discloses a foamed silica gel production inspection method and system based on silicon matrix characteristic analysis, and belongs to the technical field of high polymer material performance evaluation.The foamed silica gel product is subjected to three-dimensional structure scanning, internal foam structure data are obtained, and a foam three-dimensional structure model is established; extracting foam structure parameters based on the foam three-dimensional structure model, establishing a three-dimensional finite element model of the foamed silica gel material based on the foam structure parameters, and establishing a three-dimensional finite element model of the foamed silica gel material based on the foam structure parameters, applying a compression working condition and a stretching working condition corresponding to the actual use condition in the finite element model, performing finite element analysis on the foamed silica gel product to obtain an internal stress distribution state, and calculating a local stress concentration coefficient and an equivalent sealing performance index based on a finite element analysis result, and performance grading is performed on the foamed silica gel product based on the equivalent sealing performance index and the local stress concentration coefficient, and the dynamic sealing life is evaluated, so that the detection precision is improved.

This seedling-raising container contains silica particles. The silica particles include silica base particles having a particle size of 100 nm or more. The median particle size of the silica base particles is 120 nm to 800 nm in the particle size distribution of the silica base particles.

Refractory articles, anti-redox coating compositions, and methods of making refractory articles are provided. A refractory article includes a platinum (Pt)-based substrate and a coating layer for preventing a redox reaction on a surface of the Pt-based substrate, in which the coating layer for preventing the redox reaction includes, in terms of oxide, SiO2 in an amount of about 40 wt% to about 70 wt%, Al2O3 in an amount of about 20 wt% to about 52 wt%, B2O3 in an amount of about 3 wt% to about 6 wt%, and CaO in an amount of about 2.4 wt% to about 4.8 wt%; wherein the coating layer comprises whiskers distributed in a silica matrix, and wherein the whiskers comprise a polyaluminum andalusite crystalline phase.

The invention discloses a monobenzyl biotin product as well as a preparation method and application of monobenzyl biotin. The preparation method of the monobenzyl biotin comprises the following steps: S1, extracting debenzylation liquid containing the monobenzyl biotin, and separating out a material containing the monobenzyl biotin in an extracted water layer; s2, carrying out column chromatography on the material containing the monobenzyl biotin to obtain an eluent; wherein during column chromatography, a filler of a chromatographic column is a styrene substance and / or a bonded silica gel substrate; s3, carrying out acid precipitation on the eluent to obtain a monobenzyl biotin crude product; carrying out recrystallization on the monobenzyl biotin crude product; wherein a reagent used in the recrystallization is C1-C4 alcohol or ketone. The yield of the monobenzyl biotin product prepared by the method for preparing the monobenzyl biotin is high, the mass content of the monobenzyl biotin in the product is high, and the preparation method is simple and low in cost.

This invention relates to an adsorption chromatographic material for technetium in radioactive waste and its preparation method, comprising the following steps: S1, purging air from the pores of a silica matrix; S2, mixing acetophenone, diethyl phthalate, vinylpyridine, and divinylbenzene evenly, then adding initiator azobisisobutyronitrile and initiator V-40 and mixing evenly to obtain a mixture; S3, mixing the mixture with the silica matrix under vacuum conditions, then restoring to atmospheric pressure, and then cycling under vacuum-atmospheric pressure conditions multiple times, finally restoring to atmospheric pressure; S4, subjecting the reaction system after restoring to atmospheric pressure to multiple continuous heatings, finally restoring to room temperature, and rinsing multiple times to obtain the adsorption chromatographic material. Compared with the prior art, this invention directly obtains a pyridine-type weakly basic anion exchange resin through copolymerization, eliminating the chloromethylation and amination processes in the traditional process, greatly simplifying the resin synthesis process, and improving the adsorption chromatographic material for technetium in radioactive waste. 99 Tc has a good adsorption effect.

The present application relates to the technical field of caprolactam preparation process, and discloses a pre-fluidizing agent, a preparation method and application thereof.The pre-fluidizing agent is composed of a silicon dioxide matrix and optional impurity metal elements, the content of the impurity metal elements is not higher than 3000 ppm based on the total mass of the pre-fluidizing agent, the attrition index of the pre-fluidizing agent is not higher than 12% / h, the BET specific surface area is 210-300 cm 2 / g, and the bulk density is 0.7-1.1 g / cm 3 The pre-fluidizing agent provided by the present application has close physicochemical properties to real agents, is inert to the cyclohexanone oxime gas phase Beckmann rearrangement reaction process, can be used for the investigation of fluidized bed process blank experiment, and can obtain important basic data, such as the correction of instruments, meters, equipment, such as thermocouples and pressure difference meters, the circulation state of the catalyst of the reaction-regeneration system and the like, and can replace the gas phase rearrangement catalyst to obtain valuable data.