9results about How to "Increase capillary force" patented technology

The invention discloses a preparation method of a gas-liquid fluctuation resistant backflow electrolyzed water microchannel, and relates to the technical field of preparation of hydrogen by electrolyzed water, the preparation method comprises the following steps: S1, selecting a polar plate of an unprocessed flow channel, and designing and processing a Tesla valve array structure comprising a Tesla island; s2, selecting a processed polar plate, and processing a micro-column array at a position close to the side wall of the Tesla structure channel; s3, respectively coating the anode side and the cathode side of the proton exchange membrane with iridium oxide and platinum carbon to prepare a catalyst layer of the membrane electrode; s4, preparing a diffusion layer, and hot-pressing the proton exchange membrane loaded with the catalyst layer and the diffusion layer together to form a membrane electrode with catalytic activity; and S5, assembling the polar plate and the membrane electrode to form the proton exchange membrane water electrolysis device with the Tesla structure and the local wettability channel. According to the invention, the phenomenon of gas-liquid backflow of the electrolytic water flow channel under large current can be effectively inhibited, and the loss of active sites caused by blockage of the flow channel by the backflow electrolytic gas is avoided.

The invention discloses a micropore and microchannel composite self-circulation dual-channel cold plate, and belongs to the technical field of heat dissipation of electronic equipment. The device comprises a shell, an inlet multi-stage channel, an outlet multi-stage channel, a liquid separation cavity, a liquid collection cavity, a micro-channel area, a porous area and a steam cavity. Fluid is uniformly distributed in the inlet multi-stage channel and enters the micro-channel area through the liquid separation cavity, the fluid in the micro-channel area is heated and evaporated and enters the outlet multi-stage channel under the action of capillary force, part of the fluid enters the porous area under the driving of the capillary force, and the fluid in the porous area is heated and evaporated to form a vapor-liquid meniscus. The surface tension of the vapor-liquid meniscus drives the fluid into the vapor chamber. In the process, the porous area provides a large capillary force for fluid flowing, the micro-channel area provides a large flow rate, the fluid driving force is improved, meanwhile, the flow resistance can be reduced, and cooling of high-power-consumption devices can be achieved without external input power.

The invention belongs to the technical field of photo-thermal water and power cogeneration, and particularly relates to a preparation method of super-hydrophilic photo-thermal carbon fiber cloth and a water photovoltaic power generation sheet. The preparation method comprises the following steps: dispersing photo-thermal conversion particles into a sodium dodecylbenzene sulfonate solution to obtain a photo-thermal conversion coating, soaking carbon fiber cloth into the photo-thermal conversion coating to enable the photo-thermal conversion particles to be attached to the carbon fiber cloth to obtain the photo-thermal carbon fiber cloth, and drying the photo-thermal carbon fiber cloth to obtain the photo-thermal carbon fiber cloth. And then the surface of the photo-thermal carbon fiber cloth is coated with a thermoplastic polyurethane solution to improve the hydrophilic property of the photo-thermal carbon fiber cloth, and therefore the super-hydrophilic carbon fiber cloth with the high photo-thermal conversion performance is prepared. In the photo-thermal evaporation process, different photo-thermal conversion particle loading capacities of the carbon fiber cloth present different evaporation rates, different thermoplastic polyurethane solution brushing times of the carbon fiber cloth present different contact angles and interface evaporation temperatures, the generating capacity of the water photovoltaic power generation sheet is tested, and finally efficient photo-thermal water-power cogeneration application is achieved.

The invention discloses a leakproof composite phase change material and application of the leakproof composite phase change material in wide temperature range operation of a lithium battery, and belongs to the technical field of battery thermal management. Boron nitride nanosheet modified ceramic fibers are used as an internal supporting framework to enhance thermal conductivity and provide capillary constraint, and a core material is a phase change medium such as paraffin or n-octadecane; the invention further discloses a preparation method of the composite material and application of the composite material in lithium battery thermal management, the composite material solves the problems that a traditional phase change material is prone to leakage, poor in heat conduction and single in function, the battery can be rapidly heated at low temperature, heat can be efficiently absorbed and diffused at high temperature / normal temperature and high rate, and the service life of the battery is prolonged. The safe, efficient and stable operation of the lithium battery in a wide temperature range is realized, the leak-proof performance is high, the cycling stability is good, the preparation cost is controllable, and the application prospect is wide.

The embodiment of the utility model provides a heat conveying device which can prevent a working fluid in an evaporation part from being dried up even under the use condition that a heating body with high heat productivity is thermally connected and under the use condition that the air volume of cooling air is increased. A heat transfer device is provided with: a first heat transfer unit having an evaporation unit thermally connected to a heating element; and a second heat transport unit connected to the condensing unit of the first heat transport unit and having a heat transport direction different from that of the first heat transport unit. The first heat transport unit has an integrated internal space in which a working fluid is sealed and which communicates from the evaporation unit to a connection part between the first heat transport unit and the second heat transport unit, and the internal space of the first heat transport unit communicates with the internal space of the second heat transport unit. The heat transport device is provided with: a first capillary structure which is provided in the internal space of the first heat transport unit and which extends from the evaporation unit to the condensation unit; a second capillary structure which is provided on the inner surface of the second heat transport unit and extends in the heat transport direction of the second heat transport unit; and a backflow promoting body that is provided to the second capillary structure, extends in the heat transport direction of the second heat transport unit, and has a capillary force, the capillary force of the first capillary structure being greater than the capillary force of the backflow promoting body. The capillary force of the backflow promoting body is greater than the capillary force of the second capillary structure, or the capillary force of the backflow promoting body is the same as the capillary force of the second capillary structure.

The application discloses a composite aerogel and a preparation method and application thereof, and belongs to the technical field of functional materials and environmental treatment. In the application, delignified cotton stalk cellulose is compounded with MXene to prepare a suspension, directional freezing self-assembly is carried out by using n-heptane as a heat transfer medium, and after freezing drying and polydimethylsiloxane dip coating, a PDMS / CMNF / MXene composite aerogel is obtained. The aerogel has an ultra-fine scale, high-density vertically arranged pore channels and a multi-level pore structure, and the pore channel diameter is 20-40 mu m. Under the driving of solar energy, the surface temperature of the aerogel can reach above 120 DEG C, the rapid in-situ viscosity reduction and efficient adsorption of high-viscosity crude oil are realized, the adsorption capacity is more than 56 times of the weight of the aerogel, and the performance retention rate is greater than 90% after 10 cycles. The application provides an efficient, green and recyclable solution for the treatment of marine high-viscosity crude oil leakage.

Disclosed herein are a vapor chamber and a method of producing the same. The vapor chamber includes a chamber body plate having one surface placed in close contact with a heating surface of a heating element and the other surface that is open, and having a refrigerant filling space filled with a refrigerant therein and defined to have a predetermined thickness, a chamber cover plate bonded to shield the other open surface of the chamber body plate, and a wick formed in the refrigerant filling space, which is a space between the chamber body plate and the chamber cover plate, and having at least multiple pores through which the refrigerant filled in the refrigerant filling space flows. The wick has the multiple pores formed through an electroless Ni plating process with aluminum powder filled in the refrigerant filling space, providing an advantage of simple manufacturing and excellent heat conduction performance.

The present invention belongs to the technical field of metal powder materials, and specifically relates to a coated copper composite powder and a preparation method and application thereof. The present invention provides a copper composite powder, which has a coated structure, wherein the copper composite powder of the coated structure has large-particle copper powder inside and small-particle copper oxide powder outside. The small-particle copper oxide is not easy to agglomerate, has strong brittleness and high hardness, and is efficiently mixed with soft large-particle copper powder and partially undergoes a mechanochemical reaction to form a copper composite powder with strong bonding force. The copper composite powder is used for heat pipe sintering. Since the copper oxide itself has a high specific surface area, it will promote sintering activity. During the sintering process, the copper oxide gradually loses oxygen, which will increase the porosity of the material and further increase the bonding force with the inner wall of the copper pipe. In addition, the sintering temperature can be reduced by 200 to 300°C. The present invention can also adjust the bulk density of the compound copper powder by controlling the amount of copper powder and copper oxide powder, and finally improve the capillary force and permeability of the heat pipe.

This invention belongs to the field of low-carbon alkane energy value-added and carbon neutrality technology, specifically involving nickel-based physicochemically confined functional catalysts and their large-scale preparation and applications. The catalyst of this invention is prepared using a microemulsion method and is a hollow nanotube-shaped coated shell anchoring intermetallic compound Ni-MO. x A physical-chemical dual-confined catalyst (M is La, Ce, Mg or V) combines the physical confinement effect of nanoreactors, the electronic structure of intermetallic compound nanoparticles, and the nano-quantum effect of intermetallic compounds (including single atoms, clusters or sub-nano islands) to promote the synthesis of syngas from low-carbon alkanes in conjunction with CO2 reforming.