10 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.

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 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 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 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.