13 results about "Marangoni effect" patented technology

The invention discloses a method and application for ultrasonic-assisted laser additive manufacturing of a multi-scale structure coupling high-toughness aluminum alloy, and the method comprises the steps that high-Ni-content alloy steel powder is refined through high-energy ball milling, and then the refined alloy steel powder is dispersed and distributed in Al-Mg-Sc-Er-Zr alloy powder; an ultrasonic energy field is introduced to assist selective laser melting to form mixed powder, the ultrasonic energy field assists in generating nonlinear effects such as cavitation, acoustic streaming and heat effect, defects such as air holes and cracks are overcome to eliminate residual stress, and the Marlangoni effect is accelerated to increase the solidification speed; and finally, the high-strength and high-toughness aluminum alloy which has high density and is composed of micron-scale, submicron-scale and nano-scale multi-scale phase structures is prepared. The production cost is low, and the room-temperature tensile properties of the prepared high-strength and high-toughness aluminum alloy are as follows: the strength is greater than 850 MPa, and the fracture strain is greater than 6%.

The invention relates to the technical field of metallurgy preparation of heterogeneous materials, in particular to an efficient laser cladding preparation method of nickel-based superalloy on the surface of copper alloy, which comprises the following steps: increasing the absorptivity of the copper alloy to infrared laser through preheating, and carrying out laser cladding on GH3625 alloy on the surface of Cu-Cr-Zr alloy through regulating and controlling the components of a copper alloy / nickel alloy intermediate layer, so as to prepare the nickel-based superalloy on the surface of Cu-Cr-Zr alloy. And formation of a microstructure in the non-equilibrium solidification process is controlled, the process is optimized, and the mechanical property of the material is improved. According to the method, the intermediate layer is utilized to perform non-equilibrium state metallurgy preparation of the GH3625 alloy on the surface of the Cu-Cr-Zr base material, compared with the method without adding the intermediate layer, after the intermediate layer is added, the content of the copper element in a molten pool is increased, liquid-phase separation is promoted, a large-range Ni-Cr core shell is formed to serve as a low-energy nucleation site, crystal grains are refined, and the performance of the Cu-Cr-Zr alloy is improved. Further, a fine grain strengthening effect is achieved; the thickness of the element diffusion layer is also increased by adding the middle layer, the element uniformity is promoted, the dependence on Malangori is reduced, the heat input is reduced, the optimization of process parameters is realized, and the mechanical property of the heterogeneous material is further improved.

The invention relates to the technical field of solid-liquid interfaces and liquid drop movement and control, in particular to a method and device for achieving left-right controllable spontaneous rotation of liquid drops based on light induction, and the method comprises the following steps that acid liquid drops containing photoacid are dropwise added to the surface of liquid metal; a light source system is adopted to irradiate liquid drops on one side of the liquid drops, the liquid drops are induced to locally release non-uniform H < + > ions, and interface chemistry is initiated to generate gradient change distribution; the light intensity generated by the light source system promotes the formation of asymmetric tension distribution on the liquid drop and liquid metal interface, and drives the liquid drop to rotate along a preset direction; and by changing the irradiation position, the liquid drops can be switched between left rotation and right rotation. According to the present invention, by using the mechanism of combining the interface Marangoni effect and the light-induced acidity regulation and control, the stable and rapid spinning behavior of the liquid drop can be represented by adjusting the position, the irradiation time and the irradiation intensity of the illumination region, and the rotation direction can be reversibly switched between the left rotation and the right rotation.

The embodiment of the application provides a 3D printing hydrogel evaporator with temperature response and a preparation method thereof, and belongs to the technical field of seawater desalination.The 3D printing hydrogel evaporator comprises: an upper layer of the evaporator, which is a photothermal response layer, and the photothermal response layer comprises N-isopropyl acrylamide as a temperature-sensitive polymer; a lower layer of the evaporator, which is a hydrophilic layer configured to provide moisture for the upper layer of the evaporator, wherein the upper layer of the evaporator and the lower layer of the evaporator are adjusted in spatial structure through a 3D printing technology and integrally cured and formed.The 3D printing hydrogel evaporator prepared by the application has excellent photothermal conversion performance and water evaporation efficiency, the electrolyte property of sodium alginate and the Marangoni effect caused by the spatial structure of the internal design of the device, so that the device has super-high salt rejection performance, and is suitable for seawater desalination, sewage treatment and other applications.

The invention discloses an organic semiconductor film preparation method based on a multi-component liquid-liquid interface, and belongs to the technical field of organic semiconductor film preparation. Dissolving an organic semiconductor raw material in a mixed organic solvent to obtain a first solution; and dripping the first solution into water, and spreading the first solution on the water surface to obtain the organic semiconductor film. The surface tension of the water is larger than that of the organic solvent, the first solution is dripped on the surface of the water, the Malangei effect appears in the first solution, and the first solution is spread on the surface of the water through the Malangei effect, so that uniform and large-area preparation of the organic semiconductor film is realized. The preparation method of the fluid interface functional film based on the mixed solution has the characteristics of simplicity and rapidness in operation, high efficiency, large area of the obtained film and low cost.

The invention discloses a discoloring disguise amphibious multifunctional device and a manufacturing method thereof, the device comprises a fuel layer and a carrier layer with different thermal expansion coefficients, the fuel layer covers part of the upper surface of the carrier layer, and one end of the fuel layer partially extends out of one end side of the carrier layer; the fuel layer is formed by adopting a mixed material of thermochromic dye and a material with a rapid disassembly characteristic, and when the material with the rapid disassembly characteristic is dissolved in water, propulsive force is generated on the water surface due to a Malangi effect; the fuel layer is used for absorbing light energy, converting the light energy into heat and transmitting the heat to the carrier layer to heat the device, the fuel layer shrinks due to water loss, and the carrier layer expands due to heating, so that the device bends towards one side of the fuel layer; when the temperature exceeds the first color change temperature, the color of the fuel layer is changed from the first color to the second color and kept; and when the temperature is lower than the second color change temperature, the color of the fuel layer changes from the second color to the first color and keeps the first color. The device can be driven on the water surface and the land, and meanwhile, the color can be changed to realize active camouflage in the environment.

This invention discloses a desulfurization tower and desulfurization process based on a composite packing-baffle plate system. The main body of the desulfurization tower is the tower body, which contains, from bottom to top, a liquid storage tank, a gas buffer chamber, a packing zone, a baffle plate zone, a liquid distributor, and a demister. The baffle plate zone consists of several baffle plate units arranged in an alternating pattern to form a "serpentine reversible airflow channel." Each baffle plate unit includes a baffle plate body and surface components. This invention achieves uniform airflow distribution and preliminary desulfurization through the packing zone. Simultaneously, the special configuration of the baffle plates induces the Karman vortex street effect, enhancing gas-liquid turbulence. Combined with the precise adaptation of the baffle plate surface structure to the absorbent in the liquid storage tank, the Marangoni effect is triggered, achieving liquid film self-renewal. This invention solves the problems of inconvenient maintenance of baffle plates, easy liquid film failure, and limited mass transfer efficiency in traditional desulfurization towers. While reducing system pressure drop and energy consumption, it significantly improves desulfurization stability and purification effect.

This invention provides a method for preparing a biomimetic three-dimensional trapezoidal frustum-shaped interface evaporator inspired by mangrove root systems, as well as the biomimetic three-dimensional trapezoidal frustum-shaped interface evaporator itself. The evaporator uses melamine foam as a porous framework, waterborne polyurethane as a binder, and reduced graphene oxide as a photothermal layer, and is fabricated through biomimetic structural design and composite processes. The evaporator features a trapezoidal frustum-shaped geometry that is narrower at the top and wider at the bottom. During solar-driven interface evaporation, it spontaneously forms and couples temperature gradients, salt concentration gradients, the Marangoni effect, and a gravitational field, inducing directional transport and reflux dilution of high-salt fluids. This fundamentally inhibits salt crystallization at the evaporation interface, achieving efficient, stable, and long-term solar-driven seawater desalination. This invention also relates to the application of this evaporator in seawater desalination, providing a new solution for efficient, stable, and scalable solar-driven interface evaporation technology.

This invention discloses a highly efficient mass transfer Marangoni hydrogel reactor, its preparation method, and its applications, belonging to the field of reactors. The reactor is a fuel-loaded cellulose hydrogel rotor capable of generating the Marangoni effect. The cellulose hydrogel rotor includes a front end and a rear end; the front end is a cross-linked cellulose hydrogel, and the rear end is a cellulose hydrogel loaded with catalyst noble metal nanoparticles. This invention employs a simple dual-mold method to construct an asymmetric polymer network by hydrogen bonding between two cellulose hydrogels with different pore sizes. The resulting significant gradient surface tension allows the prepared Marangoni hydrogel reactor to rotate at high speed and for extended periods at the water-air interface. It can be applied to the degradation of organic pollutants, improving the mass transfer efficiency of the degradation catalytic reaction and thus significantly enhancing the degradation catalytic effect.

This invention discloses an amphiphilic phenolic network nanosphere, its preparation method, and its applications. The nanospheres possess an intrinsically amphiphilic topology of a hydrophobic aromatic network core and a hydrophilic hydroxyl-rich shell, and are monodisperse spherical particles with dodecyltrimethylammonium bromide anchored on their surface. This invention also provides a one-step aqueous synthesis method, achieving precise size control through the introduction of phase separation and interface modifiers. The synergistic dispersion system formed by the nanospheres and sodium fatty alcohol polyoxyethylene ether sulfate is stably dispersed in a high-salt environment (>10,000 mg / L), with an oil-water interfacial tension as low as 1.03 mN / m, capable of reversing oil-wetted core surfaces to water-wetted surfaces (contact angle ≤70°). The nanospheres of this invention can spontaneously adsorb at the oil-water interface and self-assemble under the Marangoni effect to form a high-strength particle-reinforced interfacial film. This invention provides new materials and methods for efficient oil recovery in complex reservoirs.

The invention discloses a method for improving high-temperature cycling stability of a calcium oxide heat storage material, and relates to the technical field of heat energy engineering.The method comprises the following steps that a framework structure is constructed based on the pore channel size and the surface energy gradient, and salt-philic areas and salt-repellent areas are formed on the surfaces of calcium oxide particles through atomic layer deposition; establishing a capillary threshold boundary to fix the initial position of the fused salt; by means of a capillary threshold boundary, a frequency scanning thermal field is applied and micro-pulse pressure is loaded before constant-pressure permeation, and molten salt is guided to fill step by step along a target pore diameter path and eliminate an aggregation source. According to the method, the initial distribution of the molten salt is controllable by constructing a salt-philic / salt-rejecting area, segregation is inhibited by combining hot-pressing regulation and control and a diffusion speed-limiting ring, an isothermal stress release and feedback mechanism is introduced in a cooling stage, the molten salt is self-repaired by using acoustic imaging and a Marangoni effect, the structural stability and heat storage performance of the calcium oxide heat storage material in high-temperature circulation are remarkably improved, and the service life of the calcium oxide heat storage material is prolonged. The service life is prolonged.

The invention relates to a method for removing residual liquid medicine on the edge of a wafer back based on front cleaning, which is formed by starting from a Malangori effect mechanism aiming at the special condition that a wafer and a back spraying device are almost attached due to a narrow distance and considering factors that the surface tension of a cleaning reagent is smaller than that of liquid medicine to be removed and the like. After etching or chemical cleaning of the front surface of the wafer is completed, deionized water on the front surface of the wafer is attracted and flows back to a liquid medicine residue position on the edge of the back surface of the wafer through water washing of the front surface of the wafer in cooperation with wafer revolution number change and opening and closing of a back spraying device for spraying nitrogen in combination with the Malangori effect; and residual liquid medicine at the edge of the crystal back is fully diluted and cleaned, so that the cleanness of the crystal back is ensured to the greatest extent, the pollution risk of subsequent measurement and processing procedures is avoided, and the method does not need to modify existing equipment and is convenient to implement.

The application discloses a wafer drying device, a semiconductor cleaning device and a wafer drying method. The device comprises a drying tank, a spraying plate arranged at the top of the drying tank and used for spraying a drying atmosphere into the drying tank during the drying process, a supporting plate arranged at the bottom of the drying tank and connected with the side wall of the drying tank, a supporting component arranged on the supporting plate and used for supporting a wafer to be dried, a first through hole penetrating through the supporting component in the vertical direction and arranged on the supporting component and located at the contact area of the supporting component and the wafer, a water injection pipe used for injecting deionized water into the drying tank, and a suction device used for discharging the deionized water in the drying tank during the drying process, so that the wafer immersed in the deionized water is exposed to the liquid surface and the Marangoni effect occurs between the wafer and the drying atmosphere, and the drying atmosphere is sucked after the deionized water is discharged. The maintenance difficulty of the drying tank is reduced, and the drying effect of the contact area of the wafer is improved.