34results about How to "Adjustable specific surface area" patented technology

The invention relates to a preparation method of continuous SiO2 aerogel fibers. The method comprises the following steps: processing silicate or silanol sol to prepare a spinning stock solution; adding an acidic solution to a coagulation tank to form a coagulation bath; and injecting the spinning stock solution to the coagulation bath, carrying out reaction wet spinning to obtain orthosilicic acid / silicate fibers, reeling the orthosilicic acid / silicate fibers, immersing the reeled fibers in an ageing solution, ageing the immersed fibers at normal temperature for 2-10d, washing the aged fibers with deionized water until the aged fibers are neutral, carrying out solvent displacement, and drying the obtained fibers to obtain the continuous SiO2 aerogel fibers. The method has the characteristics of cheap and easily available raw materials, simple reaction process and good spinnability, and solves the problem of difficult production of fibers through spinning SiO2 aerogel. The inorganic SiO2 aerogel fibers prepared in the invention have the characteristics of abundant holes, high specific surface area, high temperature resistance, chemical corrosion resistance and adjustable specific surface area, and can be applied in the fields of catalyst carriers and adsorbing filtration.

The invention belongs to the field of white carbon black preparation, and particularly relates to white carbon black and a preparation method and application thereof. The preparation method is capableof using a tail gas of carbon black production and the like as an acidifying agent, performing a precipitation reaction by using a stirring-auxiliary circulating-jet carbonization technology, and combining the advantages of three types of technologies of stirring, spraying and bubbling. The cost is cheap, the precipitation reaction efficiency is remarkably accelerated, and a precipitation white carbon black product of which the specific surface area is controllable can be efficiently synthesized. The preparation method is a recycling production system which is cheap in cost and green in design and manufacture, and has great industrial application value and potential social and economic benefits in the preparation industry of a tire rubber reinforcing agent.

The invention discloses a method for preparing an open-tube electrophoretic column coated with nanometer titanium dioxide, as well as application thereof. In an etched capillary column, an open-tube capillary electrophoretic column coated with the nanometer titanium dioxide is prepared by a water (solvent) thermal method. The preparation method is characterized in simplicity, coatings insusceptible to fall off, and the like, and is suitable for the selective enrichment and separation of functionalized phosphorylated polypeptide and protein in complex biological samples. Titanium dioxide molecules are combined with silicon hydroxyl on the surface of the inner wall of a capillary through chemical bonds, and nanometer titanium dioxide particles are uniform in grain, complete in coatings and capable of effectively reducing the nonspecific adsorption effect to the protein and other macromolecule samples. The surface properties and micropore structures of the coatings can be conveniently controlled by changing the categories and proportion of middle pore-forming agents in hydrothermal mixtures, so as to obtain a phosphorylated polypeptide capillary column with adjustable pore diameter and specific surface area.

The invention discloses a preparation method of a novel lithium ion battery negative electrode material based on a ZIF complex. The present invention synthesizes a novel imidazole zeolite organic framework compound, utilizes it to prepare a nitrogen-doped porous carbon material, and applies it to the negative electrode material of a lithium-ion battery, which can achieve a specific discharge capacity of 1211mAh / g for the first time. When the charge and discharge current density is 100mA / g, the specific capacity is almost 620mAh / g (the theoretical value of the specific capacity of the commercialized graphite negative electrode is 372mAh / g), even after 100 cycles, it reflects its good cycle performance, and when the current density is 1000mA / g, the specific capacity can reach 410mAh / g, reflecting its good rate performance.

The invention provides a preparation method of carbon aerogel fibers. The method comprises the following steps that a spinning stock solution is prepared; a coagulating bath is prepared; the spinning stock solution is added into the coagulating bath, wet spinning is conducted, and cellulose gel fibers are obtained; the cellulose gel fibers are subjected to winding and immersed into an ageing solution for normal temperature ageing for 15 min to 1 h, the aged cellulose gel fibers are washed to be neutral with deionized water, solvent replacement is conducted with deionized water or ethyl alcohol or tert butyl alcohol, drying is conducted, and cellulose aerogel fibers are obtained; the cellulose aerogel fibers are put into a tubular furnace to be carbonized in a nitrogen environment, and the carbon aerogel fibers are obtained. The preparation method of the carbon aerogel fibers has the advantages that the raw materials are wide in resource, low in price and easy to obtain, the preparation process is simple, the spinnability is good, and the method is green and environmentally friendly, and the problem that a carbon aerogel cannot form fibers easily is solved.

The invention provides a continuous cellulose aerogel fiber and a preparation method thereof. The preparation method comprises the following steps: dispersing cellulose into a dispersing agent so as to obtain a spinning stock solution; extruding the spinning stock solution into a coagulating bath for wet-method spinning so as to obtain cellulose aerogel fiber; winding the cellulose aerogel fiber in the coagulating bath, and soaking into an aging liquid for aging; washing the aged cellulose aerogel fiber till the pH is neutral, and drying, so as to obtain the continuous cellulose aerogel fiber. The preparation method provided by the invention has the characteristics that raw materials are cheap and easy to obtain, the preparation process is simple, green and pollution-free, the continuous cellulose aerogel fiber is good is spinnability, and the problem that cellulose aerogel is hard to spin into fiber is solved. The diameter of the cellulose aerogel fiber provided by the invention is smaller than 120 [mu]m, the cellulose aerogel fiber has the characteristics of high specific surface area (greater than or equal to 88m<2> / g), high porosity (greater than or equal to 85%), and low density (less than or equal to 0.2 / cm<3>), meanwhile the fiber specific surface area can be adjusted, and the cellulose aerogel fiber can be used in fields such as functional clothes, sensing, catalyst loading and adsorption filtration, cosmetics and biological treatment.

The invention provides a method for preparing a surface in-situ C-SiO2 composite coating of continuous SiC fibers and relates to continuous SiC fibers. The method comprises the steps: placing SiC fibers in a muffle furnace, carrying out heating in an air atmosphere, and then, carrying out furnace cooling until the temperature is room temperature in the air atmosphere, so as to obtain a degummed SiC fiber sample A; placing the degummed SiC fiber sample A in a porous graphite boat, placing the graphite boat in a heating-up tubular furnace, introducing an inert atmosphere at room temperature, andexhausting air in the tubular furnace; heating the obtained degummed SiC fiber sample A under the protection of an inert atmosphere, then, closing a N2 gas valve, opening a Cl2 gas valve, adjusting chlorine gas flow-rate, carrying out heat preservation, forming the C-SiO2 composite coating on the surface of the SiC fibers in situ through regulating and controlling a process, carrying out heat preservation, then, closing Cl2 gas, and carrying out furnace cooling until the temperature is room temperature under the protection of an inert atmosphere, thereby obtaining the surface in-situ C-SiO2 composite coating of the continuous SiC fibers.