18 results about "Contact angle" patented technology

This invention relates to the technical field of surface lubrication and friction measurement of machinery, and provides an apparatus and method for measuring the energy barrier at the surface solid-liquid interface of a microstructure. [Solution] The apparatus includes a micro-pump, a fixed elbow, a capillary tube, an upper contact surface, a lower contact surface, a droplet, a micro-movement stage, and a high-speed microscope camera. In this method, the micro-pump transports liquid to form a droplet between the upper and lower contact surfaces, the micro-movement stage is used to drag the lower contact surface at a constant speed to slide the droplet, and the high-speed camera monitors the deflection deformation caused by the droplet drag force of the capillary tube, calculates the dynamic drag force, and integrates the drag force-displacement curve to obtain the energy consumed by the droplet to overcome the microstructure. Finally, the solid-liquid interface energy barrier per unit area is obtained, overcoming the limitations of the conventional contact angle method, which cannot measure the dynamic interface energy barrier, and enabling direct and quantitative measurement of the surface solid-liquid interface energy of the microstructure.

The application is suitable for the technical field of machine tool combination assembly, and provides a micro contact joint surface static friction coefficient calculation method, which comprises the following steps: obtaining joint surface characteristic parameters; based on fractal theory and elastic theory, constructing base additional deformation and micro convex body normal deformation equation, through micro stress analysis, establishing single micro convex body deformation geometric parameters; considering three deformation stages of micro convex body, obtaining joint surface contact area and contact load; using modified island distribution function to integrate joint surface real contact area and contact load in different deformation stages, obtaining joint surface real contact area and contact load; considering the influence of static friction coefficient on contact surface characteristics, establishing joint surface static friction coefficient model. The application establishes surface static friction coefficient model from the micro contact angle, and simultaneously considers the interaction of micro convex body and base and three stages of material elastic, elastic-plastic and complete plastic deformation.

This invention relates to the field of unconventional oil and gas field development technology, specifically to a method for determining dynamic capillary force in coal and rock. The method includes: selecting target core samples to prepare coal samples and obtaining the full-scale pore size distribution of the coal samples; constructing a three-dimensional random pore network model based on the full-scale pore size distribution; obtaining a topology-corrected static pore network model; establishing a dynamic model of contact angle variation with pore pressure; establishing dynamic deformation equations for pore and throat radii variation with effective stress; and simulating the gas-driven water process under different pore pressures based on an intrusion permeation algorithm, outputting capillary force-saturation curves under different pore pressure conditions, and forming a dynamic capillary force surface plot. This application has significant application value and promising prospects in the field of unconventional oil and gas field development, significantly improving the scientific nature of reservoir seepage behavior characterization and the rationality of development engineering decisions.

The method for measuring the distribution and evolution characteristics of gas-water-oil three-phase contact angle in oil reservoir porous media belongs to the technical field of oil and gas exploitation and wettability measurement. The method is based on micro-nano CT imaging technology, through three-phase fluid seepage experiment, micro-nano CT scanning, CT image processing and analysis, and finally the statistical distribution characteristics of gas-water-oil three-phase contact angle in oil reservoir porous media under different flow states are obtained. By real-time acquisition of the interface state in the seepage process, in-situ, real and efficient measurement of three-phase contact angle is realized, which can reveal the seepage-induced wettability transition and local wettability reversal phenomenon. The fine division of water-wet, oil-wet and gas-wet pore space in oil reservoir porous media can be realized; the measurement results can provide reliable wettability data for pore-scale multiphase seepage simulation. Since the measurement results are the statistical characteristics of a large number of local contact angles, the authenticity and statistical accuracy of the contact angle measurement are significantly improved.

The purpose of the present invention is to provide a tape for protecting the front surface of a wafer, which can sufficiently fill irregularities on the front surface of the wafer and can be removed without damaging the wafer after grinding of the back surface of the wafer. The purpose is achieved by: a tape that is for protecting, during grinding of the back surface of a wafer having irregularities on the front surface, the front surface of the wafer and that comprises a base material layer and a thermoplastic resin layer, which is in contact with the wafer on the surface opposite to the side on which the base material layer is positioned, the O / C on said surface, obtained by ESCA, being 18x10-3-54x10-3; and a tape that is for protecting, during grinding of the back surface of a wafer having irregularities on the front surface, the front surface of the wafer and that comprises a base material layer and a thermoplastic resin layer, which is in contact with the wafer on the surface opposite to the side on which the base material layer is positioned, the water contact angle on said surface being 90-103°.

Provided is an O / W-type pickering emulsion exhibiting high stability in a long-term storage stability test and a freeze-thaw test.　The O / W-type pickering emulsion of the present invention comprises solid particles, an oil phase component, and an aqueous phase component, the O / W-type pickering emulsion being characterized in that: the solid particles are present at an interface between the oil phase component and the aqueous phase component; and when the solid particles are formed into a pellet under the following conditions, the contact angle of the pellet with respect to a 10 mass% 1,3-butylene glycol aqueous solution is more than 90 degrees and less than 180 degrees. Pellet formation conditions: the solid particles are placed inside a molding O-ring having an inner diameter of 35 mm, an outer diameter of 42 mm, and a thickness of 4 mm, and a load of 100 kN (10 tons) is applied for 10 seconds by a compression molding machine to form the pellet.

Coated transparent substrate (1) making fingerprints invisible, comprising a transparent substrate (2), in particular made of glass, and a so-called external coating (3) which has a contact angle with water of greater than 70 degrees and is oleophilic, characterized in that the external coating (3) has a refractive index of less than 1.5, preferably between 1.3 and 1.4, in particular between 1.34 and 1.38, and most preferably between 1.34 and 1.36.

The invention provides a fluid droplet contact angle hysteresis measurement method, device and equipment and a storage medium, and belongs to the technical field of interface flow simulation in seepage physics. According to the method, a contact angle model containing liquid drops and a solid substrate is constructed, the liquid drops are located above the solid substrate, then the energy of the model is minimized to obtain balanced liquid drops, the balanced liquid drops move downwards at a preset speed and are wetted and spread into steady-state liquid drops through liquid-solid interaction, then the liquid drops are acted in the horizontal direction, and the stable-state liquid drops are obtained. And measuring forward and backward contact angles of the liquid drop when the liquid drop is subjected to horizontal force in picoseconds, and finally calculating the difference between the forward and backward contact angles to obtain the contact angle hysteresis of the liquid drop. According to the invention, the forward contact angle and the backward contact angle of the liquid drop in a static state can be accurately measured, and the contact angle hysteresis can be calculated, so that accurate data support is provided for researching liquid-solid interface characteristics.

This invention provides a method and apparatus for determining the microscopic contact angle of a rock stratum surface, relating to the field of contact angle measurement of rock stratum surfaces. The modeling method includes: acquiring a standard sample image of a droplet formed by a known liquid on the surface of a rock stratum to be tested; determining the contact angle of the known droplet using the standard sample image; determining the contact angle equation using the correspondence between the liquid-solid interfacial tension, the liquid surface tension, and the surface tension of the rock stratum to be tested, as well as the surface tension balance equation along the contact line; determining the surface tension of the rock stratum to be tested using the contact angle equation, the known droplet contact angle, and the known surface tension of the liquid; and determining the contact angle of the droplet formed by the liquid on the surface of the rock stratum to be tested based on the contact angle equation, the surface tension of the rock stratum to be tested, and the surface tension of the liquid to be tested. This invention enables accurate and rapid acquisition of microscopic wetting contact angle data of a liquid on the surface of any rock stratum to be tested, improving efficiency and accuracy compared to methods such as nuclear magnetic resonance (NMR) and atomic force imaging (AFM), while reducing experimental costs.

Provided is a laminated film having a high level of surface hardness and excellent bendability, and also having antifouling performance that hardly deteriorates. A laminated film 1 of the present disclosure includes: a support 10; and a resin layer 11 laminated on at least one surface of the support, in which the resin layer satisfies the following Conditions 1, 2 and 3: Condition 1: in a pencil hardness test with a load of 750 g, a pencil hardness is F or greater on a surface of the resin layer of the laminated film; Condition 2: in a cylindrical mandrel test, where the surface of the resin layer of the laminated film is bent into a convex shape, no cracks occur on the surface of the resin layer with a curvature radius of 5 mm; and Condition 3: a surface of the resin layer of the laminated film has a water contact angle of 95° or greater before subjected to a steel wool abrasion test, and a water contact angle on tested areas of the surface is 90° or greater after subjected to the test.

The application provides a shale organic matter wettability evaluation method and device, and the shale organic matter wettability evaluation method comprises the following steps: measuring the contact angle of at least three test media on the surface of a target shale; generating the surface free energy, surface tension and surface tension component of the target shale according to the contact angles of the at least three test media; measuring the mineral component content and organic matter content of the target shale; and evaluating the organic matter wettability of the target shale according to the surface free energy, surface tension, surface tension component, mineral component content and organic matter content. The application can accurately evaluate the wettability of shale organic matter, does not damage the pore structure of shale, the core can be used repeatedly, and has no requirement on the shape and size of shale, thereby providing a theoretical basis for analyzing the imbibition and flowback of fracturing fluid in shale.

This invention discloses a machine learning-based method for screening heat-resistant sintering supported metal catalysts, involving the interdisciplinary field of catalyst development and machine learning. The specific steps of this method are as follows: Using the interface system of metal nanoparticles and oxide supports as the screening object, and the interface adhesion energy as the prediction target, a wetting contact angle close to 90° is set as the criterion for heat resistance to sintering; first, a standardized dataset is constructed, then two types of interface descriptors are constructed as input features, and a prediction model is trained using the SISSO algorithm to predict the interface adhesion energy. Finally, the contact angle is calculated and ranked accordingly, outputting candidate material combinations. This invention sets evaluation criteria, constructs a standardized dataset, and innovatively designs element-level interface descriptors to achieve precise and scientific catalyst screening; it uses an adaptation algorithm to train the model, combines an association algorithm to transform parameters, and designs ranking rules to achieve efficient screening and performance quantification, combining machine learning and interface science to provide technical support for catalyst development.

A nonwoven fabric (10) having a first surface (12) and a second surface (14) and an optically detectable pattern of three-dimensional features (20, 22, 24) on one of the first or second surface (12, 14), wherein each of the three-dimensional features (20, 22, 24) defines a microzone having a first area (300) and a second area (310), wherein the first and second areas (300, 310) have a difference in value for an intensive property, wherein the intensive property is one or more of: a. thickness, b. base weight, and c. volumetric density; and wherein in at least one of the microzones the first area (300) has a contact angle greater than 90 degrees, as measured by the contact angle test method detailed herein, and wherein the second area (310) has a time-to-wick of less than 10 seconds, as measured by the time-to-wick test method detailed herein.

The invention relates to a method for developing and transferring a two-dimensional material, comprising the following steps: growing the two-dimensional material on a surface of a growth substrate so that the two-dimensional material is bonded to the surface of the growth substrate by van der Waals forces, the surface of the growth substrate having a first contact angle with a drop of a liquid; providing a target substrate, the target substrate having a surface having a second contact angle with a drop of the liquid, the second contact angle being strictly greater than the first contact angle; joining the growth substrate and the target substrate by direct bonding between the two-dimensional material and the surface of the target substrate;rupture of the interface between the growth substrate and the two-dimensional material by propagation of an interfacial crack at the interface between the two-dimensional material and the growth substrate, the crack front being wetted by the liquid. Figure to be published with the abbreviation: Figure 1C;

This application relates to the field of tunnel boring equipment technology, and discloses a method and system for predicting the normal force of a cutter roller that takes into account rotational asymmetry. The method includes: obtaining parameters such as rock mass strength, penetration depth, and cutter geometry; calculating and superimposing the areas of the inner and inner compression zones of the cutter roller, and spreading them out to the circumference of the rotation trajectory to determine the cutting groove width; calculating the contact arc using the penetration depth and cutter radius, and deriving the total contact area in conjunction with the cutting groove width; calculating the contact pressure and integrating it along the total contact area to obtain the single cutter rock-breaking resultant force; setting the point of application of the resultant force to pass through the cutter axis and bisect the contact angle corresponding to the contact arc, and decomposing the resultant force to obtain the single cutter rock-breaking normal force. This invention transforms the spatial rock-breaking destruction zone into a planar equivalent integration domain, eliminating the theoretical errors caused by the traditional straight-line cutting assumption and improving the accuracy of the cutter normal force calculation.