16 results about "Surface tension gradient" patented technology

This invention relates to the field of fluid control technology and discloses a gas-liquid separation device, comprising a separator housing with a gas-liquid mixture inlet and an exhaust port, and an internal cavity for gas rotation and flow; a coalescing filter structure disposed on the inner wall region of the separator housing, having several through-channels with hydrophilic inner surfaces; a droplet transport structure fluidly connected to the coalescing filter structure, having several capillary channels inside; and a collection chamber for receiving and storing the liquid transported by the capillary channels. This gas-liquid separation device achieves efficient gas-liquid separation and stable liquid transport by using a coalescing filter structure with hydrophilic microchannels on the inner wall of the separator housing to efficiently capture and coalesce fine droplets, combined with a droplet transport structure with capillary channels that utilizes surface tension gradient differences to drive directional liquid movement, thus reducing the risk of secondary droplet entrainment.

A wafer cleaning and drying device includes: a box used to clean the wafer, an opening is arranged at the top of the box for the wafer to enter or exit the box; a support part arranged inside the box and used to hold the wafer, the support part can move upward and downward; a spraying pipe arranged at the opening and used to spray the drying gas onto the surface of the cleaned wafer. The wafer cleaning and drying device dries the surface of the wafer with the spraying pipe arranged at the opening of the box, which sprays the drying gas onto the surface of the cleaned wafer. Understandably, Marangoni effect is used in the present prevention the water attached to the surface of the wafer is eliminated on basis of surface tension gradient difference.

The invention discloses the field of wafer wet cleaning, and particularly relates to a Malangei drying method compatible with multi-size wafers, which is applied to a drying machine comprising a lifting mechanism and a controller, and the method is executed by the controller and comprises the following steps of: firstly, receiving a wafer size specification signal, driving the lifting mechanism to adjust a wafer bracket to a corresponding preset process height, and adjusting the wafer bracket to a preset process height; the upper edges of the wafers with different sizes are all located in a preset drying working area at the top of the cavity, then isopropanol steam is guided in in an immersion state to construct a surface tension gradient, finally, a drain valve is controlled to be opened to enable the liquid level to be slowly lowered, and moisture is removed through the Malangori effect. Through physical position compensation of the lifting mechanism, it is ensured that the upper edges of wafers of different diameters can be accurately aligned to the preset drying working area at the top of the drying cavity, compatibility of single equipment to the wafers of different specifications is achieved, uniformity of chemical atmosphere concentration and a temperature field is ensured, and the drying quality and the flexibility of a production line are improved.

The invention relates to an adhesive for quickly curing a tea seed cake liquid mulching film into a film, which is characterized by comprising the following components in percentage by weight: 30-50% of tea seed cake extract; 5 to 15 percent of beet polysaccharide; 0.3 to 0.8 percent of nano SiO2; 0.05 to 0.2 percent of zinc humate; the adhesive comprises the following components in percentage by weight: 20-30% of beet polysaccharide, 10-20% of tea polyphenol, 10-20% of nano SiO2, 10-20% of nano SiO2 and 45-65% of water, the molar ratio of beet polysaccharide to tea polyphenol is 1: (1.5-2.2) so as to promote dynamic ester bond crosslinking, the nano SiO2 is modified by polyethylene glycol (PEG-4000), the zeta potential ranges from-25 mV to-35 mV, the nano SiO2 is used for regulating and controlling the surface tension gradient of a liquid film, and the adhesive can keep the dynamic crosslinking capacity for 72-80 hours when the pH value of soil ranges from 5.5 to 7.8. According to the adhesive for rapidly curing and forming the tea seed cake liquid mulching film, rapid curing for 35 + / -5 minutes is achieved through the catalysis of the zinc humate and the synergistic effect of the nano SiO2, compared with a traditional starch-based mulching film, the efficiency is improved, the farming operation interval is greatly shortened, a gradient pore structure is formed through induction of the nano SiO2, the surface layer is 5 microns / the bottom layer is 20 microns, wind erosion prevention and air permeability are both considered, the self-organization film forming thickness is 1.2 + / -0.3 mm, and the film forming efficiency is greatly improved. The coefficient of variation is less than 8%, and the film-forming property is excellent.

The application discloses a valve body laser cutting device and method, which comprises the following steps: low-duty-ratio pulse scanning is performed on the outer wall of the valve body to generate a guide groove with surface tension gradient and corrugated texture; inner and outer double-layer pulse air flows are sprayed according to the characteristics of the guide groove, and periodic negative pressure cavities and positive pressure barriers on both sides are formed at the groove bottom; spiral trajectory continuous laser cutting is performed under the action of the double-layer air flows, transverse ultrasonic waves in a three-to-four resonance relationship with the inner layer pulse air flow are applied, and a standing wave guide flow is established on the surface of the molten pool to obtain a cutting seam penetrating through the wall thickness; when the cutting seam is penetrated, the air flow is switched to negative pressure suction and the ultrasonic wave is changed to a traveling wave to remove residual molten droplets; low-power rapid scanning is performed on the inner wall of the cutting seam by using the residual heat of the valve body, and pulsed inert gas flow is injected to make laminar flow and micro-turbulent flow alternately peel off the residual film. The scheme can inhibit slag backflow without increasing additional cooling or chemical treatment.

The invention relates to a method for preparing a perovskite thin film and a cell based on surface activity and the cell. The method sequentially comprises the following steps: adding a surfactant benzalkonium chloride into a perovskite precursor solution; applying the precursor solution containing benzalkonium chloride to the substrate; treating the precursor solution by adopting a multi-step spin-coating process, wherein airflow assistance or anti-solvent treatment is applied in the spin-coating process; and carrying out annealing treatment on the spin-coated film to obtain the perovskite film. According to the invention, the surfactant BAC is added to change the crystallization kinetics of the precursor ink, and the adhesive force of the perovskite ink to the non-wet charge transport layer of the substrate is increased. Due to the modification treatment of the BAC on the precursor ink, under the driving of the surface tension gradient induced by the surfactant, the existence of the BAC affects the surface tension of the perovskite precursor solution, so that the prepared perovskite thin film is compact in crystallization, the quality of the perovskite thin film is improved, and the charge trap is passivated.

The invention belongs to the technical field of defoaming agents, and particularly relates to an aqueous emulsion type non-silicon defoaming agent and a preparation method thereof. Perfluoroalkyl is used for reducing the surface tension of erucyl amide, so that fluorine-modified erucyl amide forms a surface tension gradient on the surface of a foam liquid film, and local thinning and breaking of the foam film are promoted; long-chain alkyl in fluorine modified erucyl amide and perfluoroalkyl cooperate to achieve hydrophobic anchoring, surfactant molecules on the surface of a foam film are replaced, the liquid drainage process is accelerated, and foam is rapidly broken; after foam breaking, the long-chain polyether segment of the polyether polyol is adsorbed on a foam breaking interface to form a buffer layer, so that aggregation of air to the foam breaking interface is delayed, secondary foaming is prevented, and long-term foam inhibition is realized; the polyether grafted stearate is bridged with the fluorine modified erucyl amide and the polyether polyol, so that the strong repulsive interaction between the polyether grafted stearate and the fluorine modified erucyl amide is eliminated, and the stability of the aqueous emulsion type non-silicon defoaming agent is improved.

This invention relates to various applications of materials not included in other categories and to the field of functional composite media technology. It discloses a method for enhancing the dielectric reinforcement of winding ends to improve the service life of a motor. The method includes: incorporating nanoparticles and a latent polar diluent into a resin to obtain a reinforcing medium; placing a substrate in a sealed chamber to eliminate air gaps; injecting the medium and applying gradient pressure and a pulsating sound field; heating the impregnated substrate to the boiling point of the diluent; utilizing the surface tension gradient to drive the nanoparticles to migrate and accumulate at the phase interface; and heating to solidify and construct a charge-blocking network. This invention utilizes the Marangoni micro-convection mechanism to overcome the curing steric hindrance, enabling the functional components to be directionally reconstructed in a strong electric field region, suppressing corona discharge and blocking the evolution of electrical trees, thereby improving the reliability of the insulation system under alternating stress over a wide temperature range.

This invention belongs to the field of semiconductor packaging and electronic assembly technology, specifically a low-void no-clean solder paste soldering method for semiconductor packaging. The method includes: applying no-clean solder paste to establish a pre-soldering reference; gradient heating to controllable solvent evaporation and complete the reduction reaction; inducing a hydrodynamic imbalance logic during the solder melting period, using the surface tension gradient generated by thermo-chemical synergistic induction to drive Marangoni flow, breaking the bubble interface adhesion balance, and guiding the bubbles to migrate directionally towards the edge and escape in accordance with the flow field vector; finally, performing controlled cooling and crystallization. This application can achieve ultra-low void ratio soldering under normal atmospheric conditions, significantly reducing packaging costs and improving the thermal conductivity reliability of power devices.

The invention discloses a negative plate capable of avoiding super-thick edge and a manufacturing method thereof, the manufacturing method comprises the following steps: S1, preparing negative electrode slurry: mixing graphite and a silicon-carbon composite material as an active substance, and preparing the negative electrode slurry with the solid content of 45-55wt%; s2, pulse type ultrasonic dispersion: treating the slurry by adopting intermittent pulse ultrasonic waves, wherein the ratio of working time to intermittent time is (2-3): 1; s3, surface tension gradient control: adding a surfactant with a low HLB value and a surfactant with a high HLB value according to a mass ratio of 3: 7-4: 6; s4, double-layer structure die head coating is conducted, and the ratio of Q2 to Q1 is controlled to range from 0.15 to 0.25; s5, reverse temperature gradient drying, wherein the temperature of the edge area is 10-20 DEG C lower than that of the center area. Compared with the prior art, through the synergistic effect of multiple technologies, the edge thickness ratio of the negative plate is controlled within 1.05, the energy density and rate capability of the battery are effectively improved, and the cycle life of the battery is effectively prolonged.

The invention belongs to the technical field of nucleic acid detection, and particularly relates to a nucleic acid detection method based on a liquid drop control platform. The invention provides a novel nucleic acid detection method based on a liquid drop control platform. The method depends on near-infrared laser-induced photothermal conversion and surface tension gradient-driven Marangei effect: the photothermal conversion capability of PDMS is improved by doping Fe3O4 nanoparticles in PDMS, and heating of reaction liquid drops is realized through a near-infrared laser transmission reaction. Accurate temperature control is achieved through a temperature sensor, and PDMS temperature gradient is formed through photothermal conversion, so that surface tension of liquid drops is changed, and liquid drop driving is triggered. Meanwhile, droplet evaporation is inhibited through oil immersion treatment, a PID algorithm is used for temperature control in the adjusting process, and temperature control is achieved more sensitively and rapidly. The method is expected to solve the limitation problem, and integrated nucleic acid detection which is more convenient and faster, lower in cost and higher in integration degree is realized.

The present invention discloses a self-twisting, highly thermally conductive, flexible graphene fiber and its preparation method. Water is added to an organic-phase graphite oxide spinning solution. During the coagulation and drying process of the gel fiber, both an organic phase and an aqueous phase coexist within the fiber. The uneven evaporation rate of the two-phase solvent leads to solvent concentration gradients and surface tension gradients on the fiber surface. This unevenness induces the Marangoni effect and causes the gel fiber to undergo rotational self-twist. This method allows for controllable adjustment of fiber twist by adjusting the water content of the initial spinning solution. The self-twisted fiber is then chemically reduced and graphitized to produce a highly thermally conductive, flexible graphene fiber.

The application discloses a method for measuring the elastic shear modulus of a viscoelastic liquid based on a particle tracking method. The method comprises the following steps: adding tracking particles into a viscoelastic solution to prepare a liquid film containing the viscoelastic solution with the tracking particles, dropping a surfactant droplet on the liquid film to generate a surface tension gradient on the surface of the liquid film, measuring the maximum displacement of the tracking particles when the viscoelastic liquid is in a shearing spreading motion, obtaining the strain size of the shearing motion of the viscoelastic liquid film, and obtaining the shearing stress size at the moment according to the motion displacement of the liquid film and the surface tension gradient, so as to establish a correlation model of the shearing stress and the shearing strain under the shearing action and calculate the elastic shear modulus of the viscoelastic liquid film. Compared with the existing rheometer technology for measuring the shearing modulus of an elastic liquid, the application provides a new method for measuring the elastic shear modulus of a viscoelastic liquid, and the required sample amount is greatly reduced, which is of great significance for measuring precious liquids.

The present application belongs to the technical field of defoaming agent, and particularly relates to a water emulsion type non-silicon defoaming agent and a preparation method thereof. The present application uses perfluoroalkyl to reduce the surface tension of erucic amide, so that the fluorine modified erucic amide forms a surface tension gradient on the surface of the foam liquid film, and promotes the local thinning and rupture of the bubble film. The long-chain alkyl in the fluorine modified erucic amide cooperates with the perfluoroalkyl to realize hydrophobic anchoring, replaces the surfactant molecules on the surface of the foam film, accelerates the drainage process, and makes the foam quickly rupture. After the bubble is broken, the long-chain polyether segment of the polyether polyol is adsorbed on the bubble breaking interface to form a buffer layer, delays the aggregation of air to the bubble breaking interface, prevents secondary foaming, realizes long-term foam suppression, and bridges the fluorine modified erucic amide and the polyether polyol by polyether grafting stearate, eliminates the strong repulsion between them, and improves the stability of the water emulsion type non-silicon defoaming agent.

This invention relates to deeply modified coatings and deeply modified coating composite separation membranes. The deeply modified coating is prepared using a surface tension gradient-driven Marangoni convection process and is used to deeply modify the surface and pores of an ultrafiltration or microfiltration substrate membrane. Further crosslinking with a crosslinking agent enhances the coating's stability. The deeply modified coating composite separation membrane has a three-layer structure, with the deeply modified coating as the middle layer, and also includes a bottom substrate membrane and a top dense ultrathin separation layer. The deeply modified coating significantly enhances the adsorption capacity of the substrate membrane for amine monomers and ultimately improves the desalination performance of the composite separation membrane.

The application discloses a preparation method of a gum base popping ball based on the Malan-goni effect, belongs to the field of food processing and microencapsulation technology, and particularly relates to an integrated production process which realizes forming, solidification, automatic demolding and continuous collection on a hot solid surface by utilizing the Malan-goni effect and the synergistic effect of the heat irreversible gel characteristics of the gellan gum. The application introduces a volatile surface active component into an aqueous phase, when the emulsion droplet contacts with a hot surface, the local surface tension gradient (Malan-goni effect) induced by the controlled volatilization of the component is utilized to drive the autonomous movement of the droplet and make the droplet separate from the hot surface, and meanwhile, the gellan gum wall material is rapidly heat-solidified, so that the bottleneck problems of product collection difficulty, low efficiency and easy damage in the traditional liquid bath forming method are solved, and the efficient, continuous and automatic production of high-quality sandwich popping balls is realized.