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5 results about "Capillary condensation" patented technology
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Capillary condensation is the "process by which multilayer adsorption from the vapor [phase] into a porous medium proceeds to the point at which pore spaces become filled with condensed liquid from the vapor [phase]." The unique aspect of capillary condensation is that vapor condensation occurs below the saturation vapor pressure, Pₛₐₜ, of the pure liquid. This result is due to an increased number of van der Waals interactions between vapor phase molecules inside the confined space of a capillary. Once condensation has occurred, a meniscus immediately forms at the liquid-vapor interface which allows for equilibrium below the saturation vapor pressure. Meniscus formation is dependent on the surface tension of the liquid and the shape of the capillary, as shown by the Young-Laplace equation. As with any liquid-vapor interface involving a meniscus, the Kelvin equation provides a relation for the difference between the equilibrium vapor pressure and the saturation vapor pressure. A capillary does not necessarily have to be a tubular, closed shape, but can be any confined space with respect to its surroundings.
A denitration catalyst suitable for alkali furnaces, a preparation method and application thereof
This invention provides a denitrification catalyst suitable for alkali furnaces, its preparation method, and its application, comprising the following raw materials: TiO2 support, pore modifier, vanadium precursor, tungsten precursor, Ce-modified component, and La-modified component; based on the mass of the TiO2 support, the mass percentages of the pore modifier are 3-7%, the vanadium precursor is 1-3%, the tungsten precursor is 1-7%, the Ce-modified component is 1-5%, and the La-modified component is 0.5-1.5%; the pore modifier is methyltrichlorosilane. This invention uses a V-W-Ti system as its base. By modifying the pore structure of the TiO2 support, capillary condensation is eliminated, and hydrophobicity is achieved; Ce modification of the V-W-Ti system enhances the selective adsorption of oxygen vacancies and NH3; and La modification of the V-W-Ti system enhances the acidity of the catalyst and provides alkali metal sacrificial sites. These three components synergistically address the problems of water poisoning, alkali poisoning, and insufficient activity at low temperatures.
Owner:ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
Battery system
The utility model relates to the technical field of batteries, and discloses a battery system which comprises a box body, a two-way anti-explosion valve and a capillary condensation structure, the two-way anti-explosion valve is arranged on the box body, and the two-way anti-explosion valve is provided with an air inlet and an air outlet; the capillary condensation structure is at least communicated with the air inlet; the battery system has an air inlet state and an air exhaust state, and in the air inlet state, the capillary condensation structure communicates with the interior of the box body through the air inlet so as to supply air to the interior of the box body; and in the exhaust state, the interior of the box body is exhausted through the exhaust port. The capillary condensation structure is arranged, vapor condensation and separation of gas are achieved through the capillary condensation technology of the capillary condensation structure, then the gas enters the box body, the gas entering the box body through the two-way anti-explosion valve is dry gas, and it is ensured that the pressure difference between the interior and the exterior of the box body is balanced; and meanwhile, the problem that the box body shell sinks inwards is solved.
Owner:SANY LITHIUM ENERGY CO LTD
Preparation method and application of high-strength low-temperature sintered porous ceramic
The invention relates to the technical field of inorganic non-metallic materials, and discloses a preparation method and application of high-strength low-temperature sintered porous ceramic, and the method comprises the following steps: introducing a mineralized precursor into a porous skeleton through gas-phase transportation, and localizing and enriching the mineralized precursor at a particle contact neck by capillary condensation; the surface tension of a liquid bridge is increased through slight cooling or pressure reduction, and self-adaptive pre-tightening is applied to the framework; and the precursor is induced to generate low-temperature in-situ mineralization under the condition of keeping the stress state, and the liquid bridge contractility is converted into residual compressive stress in the connecting neck. Chemical bonding strengthening among particles can be achieved at the temperature of 500-800 DEG C, high-temperature sintering densification is not needed, the contradiction between porous ceramic strength and porosity is effectively solved, and the method has the advantages of being low in energy consumption, free of pore channel blockage, controllable in structure and the like and is suitable for preparing high-performance filters and catalyst carriers.
Owner:GUANGDONG HUST IND TECH RES INST +1
Method for characterizing the water vapor sorption behavior of a rock
ActiveCN121164589BEarth material testingComputational materials scienceCapillary condensationWater vapor
The application discloses a method for characterizing rock water vapor adsorption behavior, and relates to the field of unconventional oil and gas characterization. The method comprises the following steps: providing a rock powder sample after drying treatment; performing a water vapor adsorption experiment on the rock powder sample to obtain adsorption data of the rock powder sample, wherein the adsorption data comprises water vapor adsorption amounts under different relative humidities; fitting the adsorption data in logarithmic form to obtain a target curve, determining a target relative humidity corresponding to a maximum change point of a slope of the target curve, and the target relative humidity is a relative humidity when capillary condensation of the rock powder sample starts; and determining monolayer adsorption amounts, multilayer adsorption amounts and capillary condensation adsorption amounts of the rock powder sample under different relative humidities according to a Dent adsorption model and the target relative humidity. The application can obtain the monolayer adsorption amounts, the multilayer adsorption amounts and the capillary condensation adsorption amounts of the rock powder sample under different relative humidities, respectively.
Owner:NORTHEAST GASOLINEEUM UNIV
A hydrophilic nanoparticle aggregation-modified microporous moisture transfer film material and a method for preparing the same
This invention belongs to the fields of chemistry and chemical engineering, and discloses a microporous moisture transfer membrane material modified with hydrophilic nanoparticles and its preparation method. Dopamine or its derivatives are used in a confined polymerization process within a microporous structure to form hydrophilic nanoparticle aggregates with a diameter less than 5 nanometers, which can induce capillary condensation of water vapor. This synergistically improves the water vapor permeability and gas barrier properties of the moisture transfer membrane material. Simultaneously, a hydrophilic modification layer with a roughness between 10.0 and 30.0 nanometers is polymerized on the membrane material surface to enhance the membrane material's ability to capture gaseous water molecules, thereby strengthening the water vapor permeability. The microporous moisture transfer membrane material prepared according to the technical solution of this invention achieves a water vapor permeation rate of 7300 GPU in a saturated humid air environment at 80 °C, while the oxygen permeation rate is only 1.3 GPU. Long-term testing shows that the water vapor permeability and gas barrier properties can remain stable for over 8000 hours.
Owner:DALIAN UNIV OF TECH