3 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.

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 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.