324 results about "Contact angle" patented technology

The invention discloses a composite board ultrasonic defect detection method which comprises the following steps: S1, fixing a carbon fiber circumferential winding composite pressure container on a bracket, and establishing a coordinate system with the axis of the container as a z axis; s2, a 40 MHz dry coupling phased array ultrasonic probe is attached to the scanning starting point, and the contact angle of the probe is recorded; s3, moving the probe along the spiral track of the outer surface of the container at the speed of 20mm / s, and collecting A-scanning echo signals of all array elements; s4, performing pulse compression and time domain deconvolution processing on the acquired signal to obtain a time domain echo sequence; s5, delay time is calculated according to the shell curvature, the array element signals are compensated, and focusing B-scanning data are generated; s6, splicing the B-scanning data at the step length of 0.5 mm * 0.5 mm, and reconstructing C-scanning data corresponding to the space coordinates; and S7, inputting the C-scanning data into the trained Transform network, and outputting defect types, sizes and three-dimensional coordinates. The method realizes high-frequency ultrasonic composite board defect accurate detection, remarkably improves the microcrack recognition rate, and is widely applied to safety evaluation scenes of high-pressure hydrogen storage tanks and pressure vessels.

Provided is a blade for microtomes which suppresses chipping, has excellent sharpness and durability, and can cut satisfactorily, regardless of the hardness of a sample to be cut out.　This blade for microtomes comprises a blade main body having a flat plate-shaped base portion and a pointed portion 1B formed in a tip portion of the base portion, and a water-repellent DLC thin film 2 formed on the pointed portion 1B, wherein: the contact angle of the water-repellent DLC thin film 2 with respect to water is 90° or more; a radius of curvature (R1) of a tip end E of the pointed portion 1B is 15-150 nm inclusive; a radius of curvature (R2) of a tip end F of a cutting edge including the water-repellent DLC thin film 2 is 30-250 nm inclusive and is greater than the radius of curvature (R1) of the tip end E of the pointed portion 1B; and a film thickness (d) of the water-repellent DLC thin film 2 is 15-150 nm inclusive.

The invention discloses a capillary pressure and contact angle synchronous characterization method and device of a microfluidic fluid interface, and relates to the field of interface analysis and multiphase seepage in pore media, and the method comprises the following steps: based on a pre-configured pore, particle and fluid binary image, distinguishing and extracting a fluid-particle contact interface contour and an attack / defense fluid interface contour; fitting and determining the curvature radius of each fluid interface contour through a watershed region division algorithm and reordering smoothing of Fourier descriptors; generating a multi-level size pore space based on the pore binary image, and obtaining a pore overlook radius; calculating a necking angle in combination with the curvature radius and the multi-stage size pore space to obtain an apparent contact angle and an intrinsic contact angle; and calculating the capillary pressure of the attack / defense fluid interface by combining the curvature radius, the pore overlook radius, the chip depth and the interfacial tension. According to the invention, high-precision technical support is provided for micro-fluidic multiphase seepage research.

The invention relates to a marine-source microbacterium laminae CJB-Jou02 strain capable of efficiently biodegrading PE (polyethylene) microplastics, and the degradation capability of the marine-source microbacterium laminae CJB-Jou02 strain is evaluated. According to the microbacterium capable of degrading the PE micro-plastic leaves, the microbacterium is screened out from a marine mud sample, the preservation number of the strain is CGMCC 29643, the strain treats high-density PE micro-plastic for 30 days, the weight loss rate reaches up to 16.6 + / -0.46%, and the microbacterium can be used for degrading the PE micro-plastic leaves. Based on test results of a scanning electron microscope, a Fourier transform infrared spectrum, a water contact angle instrument and an X-ray diffractometer, the strain is proved to have the capability of efficiently biodegrading the PE micro-plastic, the compact crystal structure of the PE micro-plastic is damaged, the particle diameter is obviously reduced, and the hydrophilicity is increased. Meanwhile, the invention also finds that the microbacterium leaf strain CJB-Jou02 has certain degradation capacity on PE (polyethylene) membranes and microplastic bacteria such as PA (polyamide), PP (polypropylene), PS (polystyrene), PET (polyethylene terephthalate) and the like, and a new solution is provided for solving the problem of environmental pollution of PE microplastics.

The invention provides a gluing parameter design optimization method, system and equipment for optical cement, and the method comprises a material selection and pretreatment step which is used for selecting a proper material based on an input demand type and carrying out the pretreatment of the material; a viscosity dynamic control step for dynamically adjusting the viscosity; a coating mode selection step for selecting a proper coating mode; the coating thickness design step is used for presetting the coating thickness to achieve the best coating effect; the curing parameter optimization step is used for curing the coated product and improving the performance of the product; the material selection and pretreatment step at least comprises a surfactant adding operation which is used for improving the wettability of a glue solution to a curved surface, reducing an edge contact angle and reducing the risk of edge glue shrinkage; the coating mode selection step at least comprises preset coating track operation, targeted gluing parameter design and optimization can be carried out based on different requirements, especially curved screen panel production requirements, and the quality of a final product is improved.

The invention discloses a method for predicting the penetration behavior of fused CMAS of a zirconia-based thermal barrier coating, and the method is used for predicting the penetration behavior of the fused CMAS in the coating based on the microstructure characteristics of the coating. Comprising the following steps: preparing a thermal barrier coating and summarizing microstructure characteristics of the coating; establishing a numerical model on the basis of the microstructure characteristics of the coating, and carrying out grid division in COMSOL Multiphysics; establishing a constitutive equation for reflecting the relationship among the permeation time-porosity-permeation path complexity-permeation contact angle of the internal fusion CMAS of the coating; the constitutive equation is substituted into COMSOL Multiphysics, and parameter setting is carried out on the constitutive equation; and calculating a structure and post-processing. According to the method, the dynamic permeation process of the thermal barrier coating under CMAS corrosion can be nondestructively detected, and guidance is provided for improving the CMAS permeation resistance of the thermal barrier coating through microstructure regulation and control.

The invention discloses a low-temperature fluid cavitation flow field cloud picture construction method and device considering interfacial tension. The method comprises the following steps: establishing a Venturi tube model and carrying out grid division; based on the thermodynamic effect in the low-temperature cavitation process, a cavitation model in Fluent simulation software is corrected; a surface tension coefficient of interphase acting force in a multiphase flow model in Fluent simulation software is changed to be customized by a user, a low-temperature medium surface tension function changing along with temperature is written into the Fluent simulation software in a UDF file form, a surface tension model of continuous surface force is opened, wall adhesion is checked, and a contact angle is added; importing the Venturi tube model subjected to grid division into Fluent simulation software for numerical simulation; and performing imaging processing on a result obtained by numerical simulation to obtain a cavitation flow field cloud picture. The rationality of the method is judged by comparing the cloud picture of the cavitation flow field with an experimental result.

The invention relates to the technical field of high polymer material processing and coating, in particular to an acrylic plate antifouling and antibacterial enhancing method based on a nano-composite coating, which comprises the following steps: S1, pretreating the surface of an acrylic plate; s2, preparing a nano composite coating; s3, coating: coating the surface of the acrylic plate with the activated surface with the nano-composite coating liquid, adopting a spin-coating method for coating, determining the spin-coating speed through an early test so as to control the thickness of the coating, checking the uniformity of the coating through vision after coating, and re-coating if non-uniform parts exist, in the coating process, the environment humidity is monitored through a humidity sensor and controlled at a low level so as to prevent coating defects, and the acrylic plate coated with the nano composite coating is obtained; and S4, coating curing. The antifouling and antibacterial effects of the coating are comprehensively evaluated by means of contact angle measurement, dirt adhesion experiments and the like, and the concentration or spin-coating speed of the nano material is adjusted according to a test result, so that the performance of the coating is further optimized.

The invention discloses a method and a device for measuring a dynamic contact angle of liquid on a solid surface. The method comprises the following steps: constructing a to-be-measured system containing a first liquid phase, a fluid phase and a solid phase; immersing the to-be-detected surface of the solid phase in the environment phase upwards or downwards; an end surface object is arranged opposite to the to-be-detected surface, and the two are immersed in the same environment phase; the relative distance and position of the two are adjusted, and a longitudinal fluid bridge is formed through the liquid adding device; the camera device obtains a fluid bridge interface contour image from the side surface; horizontally moving the surface of the end surface object or the solid phase, and applying transverse lateral dragging acting force to the fluid bridge to promote the fluid bridge to deform and contact the peripheral line to move or be about to move; and recording the time sequence change of the image, analyzing and calculating to obtain the time change relationship between the contact angle value and the three-phase contact point position value, and further determining the static, forward and backward contact angles and the contact angle hysteresis value. The method is simple and accurate, has wide applicability, and can cover reliable dynamic contact angle data measurement from hydrophilic to super-hydrophobic surfaces.

The invention discloses a method for rapidly measuring the surface wettability of ore grains based on low-field nuclear magnetic resonance, and belongs to the technical field of wettability measurement. According to the method, contact angles of part of energy, metal and non-metal ore particles are respectively tested through a seat drop method, then a T2 relaxation spectrum is obtained through a low-field nuclear magnetic resonance test, then a T2 weighted average value T2g value at different wetting times is obtained, linear quantitative fitting is carried out on the T2g value at different wetting times and the wetting time, and the wetting time is calculated. Obtaining a slope value kT2g of the linear function; performing first-order linear fitting on the kT2g and a corresponding ore grain contact angle theta to obtain a relational expression between the kT2g and the contact angle theta, and obtaining the wettability of the to-be-measured wettability ore grains through the relational expression between the kT2g and the contact angle theta. The linear model between the slope value and the contact angle of the T2 weighted average and wetting time fitting function established by the method is accurate and reliable, the evaluation of the surface wettability of the ore grains can be completed in only 3 minutes, and the method has the advantages of rapidness, high efficiency and the like.

The invention discloses a method for evaluating the ratio of a modified hydrophobic insulating material based on magnesium oxide doped epoxy resin, which comprises the following steps of: preparing two groups of insulating materials of epoxy resin which is not doped with magnesium oxide nano-particles and doped with magnesium oxide nano-particles, and respectively measuring the contact angle and the water absorption rate of two groups of samples at room temperature; respectively calculating hydrophobicity evaluation factors of the two groups of samples before aging by using the data; then performing high-temperature accelerated aging treatment on the two groups of materials, measuring the contact angle and the water absorption rate of an aged sample, calculating a hydrophobicity evaluation factor after aging, and comprehensively considering the hydrophobicity evaluation factor before aging and the hydrophobicity evaluation factor after aging to obtain a hydrophobicity comprehensive evaluation factor of the modified epoxy resin insulating material; and further evaluating the accuracy of the ratio of the modified hydrophobic insulating material with the magnesium oxide doped with the epoxy resin. According to the method, the hydrophobicity comprehensive evaluation factor is utilized to evaluate the hydrophobicity of the modified epoxy resin, the accuracy of different raw material ratios of the modified epoxy resin can be quickly judged, and a basis is provided for selecting a proper magnesium oxide doped modified epoxy resin raw material ratio.

The invention belongs to the technical field of oil and gas reservoir engineering and multiphase seepage dynamic monitoring, relates to a characterization method of seepage behaviors of multiphase fluid in a porous medium, and particularly provides a dynamic construction method of a multiphase displacement capillary pressure-saturation relationship based on nuclear magnetic resonance. Comprising the following steps: S1, acquiring a low-field nuclear magnetic resonance relaxation spectrum of a porous medium in a gas-water two-phase displacement process; s2, determining two-phase fluid interfacial tension, a wetting contact angle and a rock surface relaxation rate; s3, determining the dynamic cut-off relaxation time of the displacement stage; s4, calculating equivalent capillary pressure; the residual water saturation is calculated, and the equivalent capillary pressure is the capillary pressure corresponding to the current displacement stage and is used for constructing a capillary pressure-saturation curve. According to the method, the capillary pressure change in the porous medium can be obtained only through spectral analysis without a centrifugal or mercury injection experiment.

The invention relates to a method for measuring wafer surface energy in hybrid bonding based on a chemically modified probe. The method comprises the following steps: carrying out surface pretreatment on an atomic force microscope probe and a wafer sample; constructing same functional group modification layers on the surfaces of the microscope probe and the wafer sample; the bending sensitivity, the elastic coefficient and the curvature radius of the probe are calibrated; acquiring a force-distance curve based on interaction between the probe covered by the functional group modification layer and the surface of the wafer sample, and calculating initial adhesion work based on the force-distance curve; and performing error correction on the initial adhesion work by using the surface energy measured by a contact angle method of a standard wafer sample, and establishing a quantitative mapping relation between the corrected adhesion work and the bonding strength. Compared with the prior art, the method has the advantages that the probe is subjected to functional group modification, the adhesive force of the surface of the sample is measured through the functionalized probe, and the surface energy of the wafer sample in mixed bonding is calculated in mixed bonding, so that the subsequent bonding strength of the sample is estimated.

The invention provides a method for determining the pore diameter lower limit and the effective pore volume ratio of movable fluid. The method comprises the steps that the temperature of each sample under the stratum in-situ condition is calculated according to the ground temperature gradient and the burial depth; correcting the surface tension coefficient of the water by using the calculated temperature; determining an average contact angle of water and shale; calculating capillary force, enabling the capillary force to be equal to reservoir fluid pressure, and calculating the lower limit of the aperture of the movable water; carrying out carbon dioxide adsorption, liquid nitrogen adsorption and mercury injection experiments on the sample to obtain connectivity pore volume-pore size distribution, and calculating effective pore volume in combination with a movable water pore size lower limit; carrying out a low-field nuclear magnetic resonance experiment, calculating the total pore volume of macropores, obtaining the total pore volume of small pores in combination with a carbon dioxide experiment, and finally calculating the total pore volume; and calculating the pore volume ratio of the effective pores by using the pore volume of the effective pores and the total pore volume. According to the method, the evaluation precision of the lower limit of the pore diameter of the shale reservoir movable fluid and the pore volume ratio of the effective pores is effectively improved, and the test cost is reduced.

To provide a water part member that exhibits excellent anti-fouling property under actual use environment, and exhibits also excellent small object placement stability.SOLUTION: A placement portion 12 includes a substrate and a functional layer formed on a surface of the substrate, the substrate is measured in accordance with JIS-B0633 (2001), the arithmetic average roughness Ra of the surface is less than 0.1 μm, and the surface contains silicon atoms and oxygen atoms, the functional layer includes a perfluoropolyether chain, and the surface of the placement portion 12 has a contact angle of the pseudo-sewage of 104° or more, which is ion-exchanged water containing 2 ppm of sodium stearate and 1 ppm of tristearin, and a ratio of the number of oxygen atoms in a perfluoropolyether chain to the number of carbon atoms constituting a main chain of the perfluoropolyether obtained by peak separation of a spectrum obtained by performing X-ray photoelectron spectroscopy (XPS) of the surface of the placement portion 12 is less than 0.6.SELECTED DRAWING: Figure 1

The invention relates to a system for identifying a liquid from data of an image of a drop (10) of this liquid on a reflective surface (12), comprising: a) means for estimating, from said image data, the contact angle and the capillary length of the drop placed on this surface; b) means for comparing the contact angle and capillary length estimations with known data of contact angles and capillary lengths of a drop of another liquid and for identifying the nature of the liquid of the drop to be identified. figure 4

The invention discloses a key structure parameter design method for a main driving bearing of an ultra-large type shield tunneling machine, and relates to the field of design of the main driving bearing of the ultra-large type shield tunneling machine. The key structure parameter design method comprises the following steps: acquiring a rock-soil CT image of a stratum, a crack distribution image and working parameters of the shield tunneling machine, and extracting a rock hardness gradient, a crack direction angle and a soil layer non-uniformity index; generating geologic feature data; establishing a circumferential load prediction model according to the geological characteristic data, and calculating an equal angle value and an overturning moment to obtain dynamic load spectrum data; constructing a contact angle distribution function based on the dynamic load spectrum data, and generating asymmetric contact angle three-dimensional curve data; seamless butt joint with CAM is achieved through space projection transformation, the performance of the bearing is finally embodied, finite element analysis shows that stress distribution is more uniform, the service life of the bearing is prolonged, and cutting force and material loss are reduced through technological parameter optimization.

The invention provides a method for predicting behavior numerical values of wet particles in a fluidized bed, and belongs to the technical field of behavior prediction of wet particles in fluidized beds. And the problem of limitation of a traditional method in treatment of a complex wet particle system is solved. The method comprises the following steps: 1, establishing a full-analysis non-spherical wet particle CFD-DEM model, and modeling particle shape, size and liquid attribute; 2, on the particle size, setting different working conditions based on a full-analysis model for simulation, exploring formation and evolution of liquid bridge force and the influence of the liquid bridge force on particle motion, and obtaining dynamic characteristics and interaction data of a liquid bridge between wet particles through direct numerical simulation; 3, extracting and establishing a liquid bridge force model suitable for describing high liquid content, large contact angle and non-spherical particles from liquid bridge dynamic data; and 4, substituting the obtained non-spherical liquid bridge force model into an unanalyzed CFD-DEM framework to predict the fluidization behavior of wet particles in a fluidized bed. The method is mainly used for wet particle prediction.

Methods of polishing and / or forming a coated article include polishing a first major surface of a substrate with a polishing liquid. Then, methods include washing the first major surface with a cleaning liquid. In aspects, the cleaning liquid has a pH from about 7 to about 11. In aspects, the polishing liquid is supplied at a rate of 20 mL / min or less. In aspects, methods can further include applying a hydrophobic coating to form a coating with an exterior surface of the coated article. A coated article includes a hydrophobic coating with an exterior surface disposed on a first major surface of a substrate. A water contact angle of the exterior surface is about 100° or more. The coated article can exhibit an abraded water contact angle of about 100° or more after being abraded with steel wool for 8000 cycles in the Taber Test.

The invention discloses a rock pore wall surface complex mixed wettability characterization method which comprises the following steps: acquiring pore structure parameters, and constructing a two-dimensional complex pore structure matrix model based on the pore structure parameters; based on the two-dimensional complex pore structure matrix model, obtaining a pore wall surface, and endowing the pore wall surface with a first contact angle to obtain single-phase wettability characterization; grouping and sampling the pore wall surfaces according to a first proportion, and endowing each group of sampled pore wall surfaces with a second contact angle to obtain mixed wettability characterization, the first proportion being equal proportion; grouping and sampling the pore wall surfaces according to a second proportion, and endowing each group of sampled pore wall surfaces with a third contact angle to obtain complex mixed wettability characterization, the second proportion being a non-equal proportion; based on the single-phase wettability characterization, the mixed wettability characterization, and the complex mixed wettability characterization, comprehensive wettability characterization is obtained. According to the method, the complex mixing wettability of the reservoir rock pore structure can be accurately represented.

The invention relates to the technical field of preparation of hydrophobic materials, and discloses a composite material and a preparation method and application thereof, the composite material comprises a matrix and a particle layer compounded on the surface of the matrix; the substrate is platinum silica gel; the particle layer is composed of organic and / or inorganic micron particles; the static contact angle of the composite material is not less than 130 degrees. The composite material has excellent hydrophobic performance, so that liquid cannot stay on the surface and is easy to discharge. Preferably, the composite material exhibits good stability, durability and adaptability to bending.

The invention discloses a device and a method for measuring a high-temperature contact angle of viscous resin, and relates to the field of testing of physical properties of materials. In order to overcome the problems that the resin is difficult to absorb and drop due to high viscosity, the wiredrawing phenomenon is generated, the measurement is difficult and the like, a heating device is additionally arranged on the basis of a traditional contact angle tester, and a common glass injector is changed into a stainless steel injector, so that the measurement of the high-temperature contact angle is realized. According to the invention, by designing the sample preparation mode and changing the drop volume and the trigger mode, the contact angle between the resin and the fiber woven cloth can be accurately measured, and the wettability of the resin to the fiber woven cloth is better represented.

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 invention discloses a real-time measurement method for a 3D dynamic contact angle in a gap flow field based on interference measurement. Comprising the steps that a 3D dynamic contact angle real-time measurement optical platform is built, a reference interference image is collected, and reference interference image phase distribution is obtained according to the reference interference image; an interference image of the gap flow field to be measured is collected in real time, interference image phase distribution is obtained according to the interference image at the current moment, and liquid level height distribution at the current moment is obtained according to the interference image phase distribution at the current moment and the reference interference image phase distribution; obtaining a gas-liquid-solid contour line according to the liquid level height distribution at the current moment; and obtaining the contact angle at the current moment according to the liquid level height distribution and the gas-liquid-solid contour line at the current moment. According to the invention, 3D measurement and real-time measurement of the contact angle can be realized at the same time, the problem that 3D measurement and real-time measurement cannot be realized at the same time in the conventional test method is solved, and the method is also suitable for contact angle measurement of irregular liquid drops or flow field gas-liquid interfaces.

The present application discloses a test cartridge, a method for preparing a test cartridge, and a method for using the test cartridge, comprising: a cartridge body having a closed end at one end and an open end at the other end, the cartridge body including a reaction chamber, a cleaning chamber, and a detection chamber connected in sequence, the reaction chamber being used to load a sample to be tested and a reaction solution mixed with magnetic beads, the detection chamber being loaded with a detection solution, and the cleaning chamber being loaded with a cleaning solution and a separator liquid, the separator liquid being used to separate the cleaning solution from the reaction solution and the cleaning solution from the detection solution, the separator liquid having a depth of h, a contact angle between the separator liquid, an upper liquid phase, and the inner wall of the cleaning chamber being θ1, a contact angle between the separator liquid, a lower liquid phase, and the inner wall of the cleaning chamber being θ2, and a radius of the cleaning chamber being r; and a cartridge cover being sealed and connected to the open end of the cartridge body. The present application avoids the use of a separator, thereby simplifying cartridge assembly.

The invention discloses an antistatic ABS material antistatic performance detection and analysis system, and relates to the ABS material antistatic performance detection technology field, and the method comprises the following steps: generating a steady state relative humidity set point sequence at a set temperature, using 60 DEG C gloss and white light interference to quantify surface roughness, and calculating an effective contact area amplification amount; calculating the adsorption wet film coverage based on the contact angle spectrum constant; carrying out four-probe measurement under different electrode relative orientation angles in double processes of humidifying and dehumidifying, and extracting a humidifying threshold value, a dehumidifying threshold value and a lag ratio; and calculating a collaborative percolation threshold index according to the effective contact area amplification amount, the adsorption wet film coverage degree, the direction factor of threshold inversion and the critical connection degree, and giving a passing conclusion of a target humidity interval. According to the method, stable positioning and reliable release judgment of the threshold value of the antistatic ABS material can be realized.

The invention provides an in-situ emulsion surfactant optimization method, and belongs to the technical field of oil and gas field development engineering, and the method comprises the following steps: S1, constructing an emulsion in-situ generated droplet property characterization device; s2, injecting the simulated oil and the surfactant solution into an emulsion in-situ generated droplet property characterization device at a constant speed, preparing an emulsion, and injecting the simulated oil and the surfactant solution at a preset flow ratio and a preset speed; s3, observing the type of the emulsion, and measuring the particle size and the contact angle of the emulsion; and S4, repeating the steps S2 to S3, comparing the emulsifying properties of the surfactants according to types and concentrations, and preferably selecting the type and concentration of the oil displacement surfactant suitable for reservoir in-situ oil. According to the method, the process that in-situ emulsion generates liquid drops under the reservoir condition is simulated, the properties of the liquid drops of the in-situ emulsion are quantitatively represented, and the surfactant suitable for the reservoir is preferably selected.

The invention belongs to the technical field of surface modification, and particularly relates to a super-hydrophobic insulating coating with a surface microstructure and a preparation method and application of the super-hydrophobic insulating coating. The defects of poor environmental stability, low regulation and control precision, insulation performance attenuation and the like in the prior art are overcome, the static contact angle of the disclosed super-hydrophobic insulation coating is larger than or equal to 150 degrees, the rolling angle is smaller than or equal to 5 degrees, meanwhile, the insulation strength is larger than or equal to 90% of that of an original substrate (the breakdown field strength is larger than or equal to 20 kV / mm), and collaborative optimization of the super-hydrophobic performance and the insulation performance is achieved; moreover, after the coating is naturally aged outdoors for 3 years, the contact angle change rate is smaller than or equal to 10%, the insulation strength attenuation rate is smaller than or equal to 8%, and the long-term environmental stability of the super-hydrophobic insulating coating is effectively improved. A precise regulation and control mechanism is also established based on a molecular dynamics simulation-based low-droplet adhesion microstructure insulation surface design method, so that the droplet contact time is reduced by more than 60% compared with a flat surface, the instantaneous leakage current is reduced by 40%-60%, and the method not only adapts to a polluted environment with the temperature range of-40 DEG C to 180 DEG C and the salt mist concentration of less than or equal to 0.5 mg / m, but also meets the preparation requirements of power equipment with complex shapes.

Methods of polishing and / or forming a coated article include polishing a first major surface of a substrate with a polishing liquid. Then, methods include washing the first major surface with a cleaning liquid. In aspects, the cleaning liquid has a pH from about 7 to about 11. In aspects, the polishing liquid is supplied at a rate of 20 mL / min or less. In aspects, methods can further include applying a hydrophobic coating to form a coating with an exterior surface of the coated article. A coated article includes a hydrophobic coating with an exterior surface disposed on a first major surface of a substrate. A water contact angle of the exterior surface is about 100° or more. The coated article can exhibit an abraded water contact angle of about 100° or more after being abraded with steel wool for 8000 cycles in the Taber Test.

The invention discloses an optimal selection method of a surfactant for an oil reservoir, and belongs to the technical field of oil development. The optimal selection method comprises the following steps: preparing N pretreated parallel plunger samples, displacing a simulated oil layer with crude oil, aging the plunger samples under a formation condition until the plunger samples reach the wettability of an oil reservoir, and sampling and measuring an initial contact angle; performing oil displacement on the N aged plunger samples by using N surfactants to obtain corresponding oil displacement efficiency, and sampling and measuring a contact angle; comprehensive indexes are calculated based on the oil displacement efficiency, the contact angle and the initial contact angle, and the surfactants are sorted according to the comprehensive indexes. According to the method, a parallel plunger sample is selected to carry out an oil displacement efficiency experiment by adopting different surfactants in a simulated oil layer state, the performance of the surfactant is evaluated based on the oil displacement efficiency experiment and indexes such as wettability and oil displacement efficiency obtained before and after oil displacement implementation, finally a comprehensive index is selected, and the surfactant is preferably selected based on the comprehensive index.