69results about How to "Reduce capillary force" patented technology

The invention discloses a method for preparing aerogel materials by combining hydrothermal synthesis technology and sol-gel technology. The prepared aerogel comprises one or more of alumina aerogel, silica aerogel, zirconia aerogel and titania aerogel. The method comprises the following steps: mixing a reactant and a structure-directing agent according to certain proportion, and adding a pH value control agent to adjust the pH value; sealing hydrothermal reaction equipment, heating the mixture to be between 50 and 280 DEG C, making the mixture stand for 0 to 72 hours, raising the temperature to be between 60 and 300 DEG C, and continuously reacting for 0.1 to 72 hours; and cooling gel, taking out the gel, drying the gel and obtaining the aerogel. Compared with the prior art, the method has low reaction temperature and pressure, small equipment investment and simple and controllable technology, reduces potential safety hazards, greatly improves the preparation speed of the aerogel, saves the production cost, and is favorable to realize commercial mass production.

The invention provides a method for preparing a continuous alumina-based ceramic fiber, which relates to an alumina-based ceramic fiber, in particular to a method for preparing a continuous alumina-based ceramic fiber which takes alumina as a main component and adds a second component as a crystalling phase inhibitor. The invention provides a method for preparing the continuous alumina-based ceramic fiber, which is simple in technique and low in cost. The method comprises the steps: preparing alumina sol; preparing silicon dioxide sol; mixing the alumina sol and the silicon dioxide sol to obtain biphase sol, and adding a spinning addition agent into the biphase sol; condensing the biphase sol added with the addition agent and spinning by a dry method to obtain the gel fiber; pyrolyzing the gel fiber to obtain the ceramic fiber; and sintering the ceramic fiber to obtain the continuous alumina-based ceramic fiber.

A microfluidic device for analyzing biological samples is provided with a sample inlet section including an inlet port, a capillary passageway communication with the inlet port and with an inlet chamber. The inlet chamber includes means for uniformly distributing the sample liquid across the inlet chamber and purging the air initially contained therein.

Disclosed is a liquid chemical for forming a water-repellent protecting film at least on a surface of a recessed portion of an uneven pattern at the time of cleaning a wafer having a finely uneven pattern at its surface and containing silicon at least a part of the uneven pattern. This liquid chemical contains a silicon compound A represented by the general formula: R¹_aSi(H)_bX_4-a-b and an acid A, the acid A being at least one selected from the group consisting of trimethylsilyl trifluoroactate, trimethylsilyl trifluoromethanesulfonate, dimethylsilyl trifluoroactate, dimethylsilyl trifluoromethanesulfonate, butyldimethylsilyl trifluoroactate, butyldimethylsilyl trifluoromethanesulfonate, hexyldimethylsilyl trifluoroacetate, hexyldimethylsilyl trifluoromethanesulfonate, octyldimethylsilyl trifluoroactate, octyldimethylsilyl trifluoromethanesulfonate, decyldimethylsilyl trifluoroacetate and decyldimethylsilyl trifluoromethanesulfonate.

Disclosed is a liquid chemical for forming a water repellent protective film on a wafer that has at its surface a finely uneven pattern and contains silicon element at least at a part of the uneven pattern, the water repellent protective film being formed at least on surfaces of recessed portions of the uneven pattern at the time of cleaning the wafer. The liquid chemical contains: a silicon compound (A) represented by the general formula R¹_aSi(H)_b(X)_4−a−b and an acid; or a silicon compound (C) represented by the general formula R⁷_gSi(H)_h(CH₃)_w(Z)_{4−g−h−w} and a base that contains no more than 35 mass % of water. The total amount of water in the liquid chemical is no greater than 1000 mass ppm relative to the total amount of the liquid chemical. The liquid chemical can improve a cleaning step that easily induces pattern collapse.

Disclosed is a liquid chemical for forming a water-repellent protecting film on a wafer. The liquid chemical is a liquid chemical containing a water-repellent-protecting-film-forming agent for forming the water-repellent protecting film, at the time of cleaning the wafer which has a finely uneven pattern at its surface and contains at least at a part of a surface of a recessed portion of the uneven pattern at least one kind of matter selected from the group consisting of titanium, titanium nitride, tungsten, aluminum, copper, tin, tantalum nitride, ruthenium and silicon, at least on the surface of the recessed portion. The liquid chemical is characterized in that the water-repellent-protecting-film-forming agent is a water-insoluble surfactant. The water-repellent protecting film formed with the liquid chemical is capable of preventing a pattern collapse of the wafer, in a cleaning step.

The invention provides a preparation method of zirconium oxide aerogel, which comprises the following steps of: dissolving alkoxide into anhydrous ethanol, and stirring and mixing to obtain an ethanol solution containing the alkoxide; dropwise adding concentrated nitric acid, then adding a mixed solution containing deionized water, formamide and epoxy propane, and continuously stirring for 20-60 minutes to obtain clear transparent sols; transferring the sols into a mould, and standing and ageing to obtain ZrO wet gels; respectively soaking the ZrO wet gels at 35-100 DEG C by using ageing liquids; and finally supercritically drying an object obtained by soaking with a drying medium solvent for 2-5 times to obtain a complete block-shaped ZrO aerogel. The method provided by the invention realizes the preparation of the block-shaped ZrO aerogel and solves the technical problem of preparing a low-density medium-intensity block-shaped zirconium oxide; and in addition, the block-shaped zirconium oxide aerogel has the density of 100-250 kg/m<3>, the normal-temperature heat conductivity of 0.018-0.031 w/mk and the compressive strength of 100-300 KPa.

The invention discloses a rapid drilling fluid, of which the component proportion according to mass parts comprises 3-5 parts of sodium soil, 0.2-0.3 part of organosilicate semipermeable membrane agent, 1-3 parts of modified starch filtrate reducer, 1.5-2.5 parts of sulfonated-methyl brown coal, 0.2-0.3 part of zwitterions encrusting agent, 0.2-0.5 part of rapid drilling agent and 90-100 parts of water. The rapid drilling fluid is water based drilling fluid by which drilling speed is greatly increases. Simultaneously, the drilling cost is low, no mud drum is produced in drilling process, and the drilling performance and the well wall are stable.

Methods of forming dispersible dielectric particles, as well as articles and compositions that include the dispersible dielectric particles, are provided. The methods involve forming an aqueous mixture of dielectric (e.g., barium titanate-based) particles and replacing at least a portion of water in the mixture with a non-aqueous solvent (e.g., ethanol). According to one set of methods, the particles are then dried. The limited, or lack, of water present in the mixture during drying reduces capillary forces that otherwise may draw the particles together to cause formation of strong agglomerates. Thus, particle agglomeration during drying may be reduced which increases particle dispersibility. According to another set of methods of the invention, the particles are not dried after non-aqueous solvent replacement, thus, avoiding formation of agglomerates during drying and increasing dispersibility. In both sets of methods, particles (or mixtures thereof) may be further processed, for example, to form composite layers. As a result of the increased particle dispersibility, the particles are relatively uniformly distributed throughout the polymeric material. This uniform distribution improves properties of the composite layers which may be used as an embedded capacitor in electronic applications including printed circuit boards.

A method for reducing or climinating water block around a well bore of a well bore region in a reservoir is provided. The method comprises removing the water from around the well bore, injecting crude oil around the well bore, and injecting precipitants causing surface precipitation of asphaltenes thereby altering formation wettability in the well bore and decreasing capillary forces of retention for water and/or gas condensates and increasing the flow of hydrocarbon fluids from the reservoir.

The invention belongs to the technical field of new material preparation and relates to a preparation method of blocky hybrid aerogel which specifically refers to blocky aerogel fast prepared under the normal pressure condition and has an efficient removing effect on Cd2+ in waste water. The preparation method includes the steps that firstly, tetraethyl orthosilicate, deionized water, acetonitrile and an oxalic acid solution are measured and taken and are mixed, and the mixture is placed in a water bath kettle to react; after reaction, a beaker is taken out, 3-aminopropyltriethoxysilane is transferred into the beaker through a pipette when temperature returns to room temperature, and acetonitrile is added for aging after gelation; then gel is soaked in an acetonitrile solution containing isophorone diisocyanate and is placed in the water bath kettle for crosslinking; finally, acetonitrile is added, after standing performed under room temperature, the gel is sealed through a preservative film with needle holes and placed in a normal-pressure drying oven to be dried, and the silicon dioxide blocky hybrid aerogel is obtained. In the preparation process of the blocky hybrid aerogel, no solvent exchange or surface modification exists, consumed time is short, consumed energy is little, operation is easy, and the blocky hybrid aerogel has an efficient adsorbing effect on Cd2+ in waste water.

The invention discloses an ambient pressure drying method of silsesquioxane aerogel. According to the ambient pressure drying method of the silsesquioxane aerogel, methyltrimethoxysilane is taken as aprecursor, water is taken as a solvent to be combined with a surfactant, silica wet gel with a large aperture size can be prepared through a sol-gel process, after solvent replacement by ethanol is carried out, the silica wet gel is directly and slowly dried at high temperature, and a silsesquioxane aerogel material can be prepared. According to the ambient pressure drying method of the silsesquioxane aerogel, the methyltrimethoxysilane is selected as the precursor, so that the in-situ modification of a gel skeleton surface is realized, the aperture structure is controlled by the surfactant content, the solvent replacement efficiency can be improved, the capillary force during drying can be reduced, the use amount of organic solvent in the ambient pressure drying process is greatly reduced, and the large-scale production is facilitated.

The inventions described herein relate generally to novel methods for increasing oil extraction using complex nano-fluids and, in at least one embodiment, to a method of increasing the recovery during oil extraction by injecting complex nano-fluids into an injection well in order to increase oil production yields.

An anode of a proton exchange membrane fuel cell does not generate water, but water generated by a cathode can enter the anode through concentration diffusion, and the water needs to be carried out of the cell by hydrogen to ensure stable cell performance, so that the burden of anode water management is increased and the hydrogen utilization rate is reduced. The invention relates to a membrane electrode capable of improving the anode water management of a proton exchange membrane fuel cell. According to the membrane electrode, water-locking substances such as SiO2 and other oxides are added into a membrane and a catalyst layer on the anode side to lock a large quantity of anode water in the catalyst layer and the membrane; an anode micropore layer is made from carbon materials, such as graphite powder, with relatively good hydrophobicity, relatively high conductivity and relatively large particle size, so that the water resistance of the anode micropore layer can be improved, a large quantity of water is prevented from entering an anode flow field, and the anode water management burden is reduced.

The invention discloses a preparation method of high-temperature-resistant ultralow-density silicon carbide nanotube aerogel. The preparation method of the aerogel comprises the following specific steps: (1) dissolving alkyl trialkoxy silane, dialkyl dialkoxy silane and hexadecyl trimethyl ammonium bromide in deionized water to obtain a transparent solution, wherein the molar ratio of alkyl trialkoxy silane to dialkyl dialkoxy silane to hexadecyl trimethyl ammonium bromide to deionized water is 1: (0.1-1): (0.1-0.5): (40-80); according to the preparation method disclosed by the invention, thepoly alkyl siloxane gel with a macroporous structure is obtained by utilizing phase separation of alkyl siloxane in a sol-gel process in a water system, the capillary force in a normal-pressure process can be greatly reduced by the macroporous structure, a low-density aerogel block can be obtained under normal-pressure drying, and the preparation method is simpler.

The invention discloses a method for preparing silicon dioxide aerogel by a sublimation method. The method comprises the following steps of (1) dissolving a sublimation substance in an alcohol-water solvent to obtain a transparent solution; (2) adding a silicon source and a alkali catalyst into the solution in step (1), uniformly mixing and standing to form gel, and then aging the gel; (3) carrying out vacuum sublimation on the aged gel in step (2) to remove the sublimation substance so as to obtain the silicon dioxide aerogel. According to the method, the sublimation substance can plug the gaps of the gel, plays a role in enhancing the network structure of the gel, and can reduce the shrinkage of the gel; solvent exchange and gel surface modification process are not needed in the preparation process, so that a large amount of organic solvents are saved, and the preparation efficiency of the silicon dioxide aerogel is greatly improved. The silicon dioxide aerogel prepared by the methodis of a nano-pore structure and has the advantages that the pore diameter distribution is 1-200 nanometers; the BET specific surface area is as high as 300-1000 m2/g<1>, the density is 0.05-0.65 g/cm<3>, and the thermal conductivity is 0.01-0.08 W/m<1>/k<1>.

The invention discloses polybenzoxazine aerogel and a preparation method thereof, and belongs to the technical field of aerogel materials. The preparation method comprises the steps of: dissolving a benzoxazine monomer in an organic solvent to obtain a benzoxazine monomer solution; adding an aliphatic polyamine cross-linking agent, mixing well, pouring the solution into a mold, heating for a gelation reaction, and aging to obtain polybenzoxazine wet gel; then carrying out normal pressure drying to obtain polybenzoxazine aerogel with a low reaction degree; and heating to 200 DEG C in air in a stepped manner, preserving heat for 2-12 hours at each temperature section, and cooling to room temperature to obtain polybenzoxazine aerogel. The linear shrinkage rate of the aerogel can be reduced, and the aerogel is good in thermal stability and easy to form.