46 results about "Viscoelastic fluid" patented technology

Described here are systems and methods for accessing Schlemm's canal and for delivering an ocular device or fluid composition therein. The ocular devices may maintain the patency of Schlemm's canal without substantially interfering with transmural fluid flow across the canal. The fluid composition may be a viscoelastic fluid that is delivered into the canal to facilitate drainage of aqueous humor by disrupting the canal and surrounding trabeculocanalicular tissues. Tools for disrupting these tissues and minimally invasive methods for treating medical conditions associated with elevated intraocular pressure, including glaucoma, are also described.

Described here are systems and methods for accessing Schlemm's canal and for delivering an ocular device or fluid composition therein. The ocular devices may maintain the patency of Schlemm's canal without substantially interfering with transmural fluid flow across the canal. The fluid composition may be a viscoelastic fluid that is delivered into the canal to facilitate drainage of aqueous humor by disrupting the canal and surrounding trabeculocanalicular tissues. Tools for disrupting these tissues and minimally invasive methods for treating medical conditions associated with elevated intraocular pressure, including glaucoma, are also described.

Described here are systems and methods for accessing Schlemm's canal and for delivering an ocular device, tool, or fluid composition therein. The ocular devices may maintain the patency of Schlemm's canal without substantially interfering with transmural fluid flow across the canal. The fluid composition may be a viscoelastic fluid that is delivered into the canal to facilitate drainage of aqueous humor by disrupting the canal and surrounding trabeculocanalicular tissues. Some systems described here may be configured to cut or tear the trabecular meshwork with the body of an elongate member located within Schlemm's canal. Other tools for disrupting these tissues and minimally invasive methods for treating medical conditions associated with elevated intraocular pressure, including glaucoma, are also described.

The application discloses an aortic valve guide wire and a use method thereof, which comprises a head section, a transition section and a support section connected in sequence along an axial direction; the head section is composed of a polymer and further comprises a deformation capsule, at least one closed unit embedded in the head section, and an internal sealing electric field sensitive viscoelastic fluid; a mesh cable is arranged on the surface of the deformation capsule and extends to the transition section; the transition section and the support section are provided with a conductive film on the surface, and the conductive film is connected with the mesh cable and used for applying a non-uniform electric field to the deformation capsule to generate a regional viscosity difference and drive the head section to bend in a direction.The electric field sensitive viscoelastic fluid built in the head section generates a regional viscosity difference under the action of the non-uniform electric field, and the difference is converted into a directional bending moment through the synergistic effect of the mesh cable and the conductive film, so that the head of the guide wire can quickly respond to an external electric signal and accurately deflect.

Described here are systems and methods for accessing Schlemm's canal and for delivering an ocular device or fluid composition therein. The ocular devices may maintain the patency of Schlemm's canal without substantially interfering with transmural fluid flow across the canal. The fluid composition may be a viscoelastic fluid that is delivered into the canal to facilitate drainage of aqueous humor by disrupting the canal and surrounding trabeculocanalicular tissues. Tools for disrupting these tissues and minimally invasive methods for treating medical conditions associated with elevated intraocular pressure, including glaucoma, are also described.

The invention belongs to the technical field of sealing parts, and particularly discloses a polyurethane sealing part and a production process thereof.The polyurethane sealing part comprises a first connecting pipe and a second connecting pipe, and the end, close to the first connecting pipe, of the second connecting pipe is fixedly connected with an inserting ring. The problems that a traditional sealing piece is small in contact area and poor in coating performance are solved, a first connecting pipe and a second connecting pipe are positioned through an inserting ring to form mechanical embedding, a protruding ring of a sealing connecting ring is matched with an annular groove of an elastic ring and an expansion rubber ring to construct a physical sealing barrier, the contact area is increased, and when an extrusion assembly applies pressure, an external supply set injects viscoelastic fluid of an outer bag body into an inner cavity of the elastic ring; the driving elastic ring and the expansion rubber ring are internally expanded and externally hooped to doubly wrap and fill the interface gap, so that the plane-to-three-dimensional contact upgrade is realized, the stress is uniformly dispersed, and the expansion rubber ring can compensate the gap through elastic deformation to improve the sealing performance even if the pipeline is rusted and displaced.

The invention belongs to the technical field of biology and microfluidics, and particularly relates to a single bacterium liquid drop wrapping method capable of breaking through Poisson distribution and application. The preparation method comprises the following steps: (1) preparing the micro-fluidic chip by a soft printing method; (2) bacteria death and viability dyeing; (3) counting bacteria; (4) adjusting different densities of bacteria; (5) preparing a viscoelastic fluid, namely a polyoxyethylene (Polyethylene Oxide PEO (6000 KDa) mother solution (0.05%); (6) preparing a sample solution; (7) constructing an experimental operation platform; and (8) observing. The micro-fluidic chip is provided with a spiral focusing area, one end of the spiral focusing area is provided with a sample inlet tube, the sample inlet tube is provided with a sample inlet connected with a disposable syringe, the other end of the spiral focusing area is provided with a liquid drop collecting tube, the tail end of the liquid drop collecting tube is provided with a liquid drop collecting port, and the liquid drop collecting port is provided with a liquid drop outlet. A continuous phase inlet pipe is arranged on the liquid drop collecting pipe, and a continuous phase inlet is formed in the continuous phase inlet pipe.

Embodiments herein disclose a method for fabricating high aspect ratio structures. The method includes depositing a predefined quantity of a viscoelastic fluid on a top surface of a bottom cell plate and compressing the viscoelastic fluid deposited on the top surface of the bottom cell plate using a bottom surface of a top cell plate. The viscoelastic fluid is a blend of a solvent and a polymer. At least one of the top cell plate and bottom cell plate comprises a plurality of lands, sealed source holes and / or unsealed source hole for penetration of a low-viscous fluid. Further, the method includes separating the top cell plate and the bottom cell plate to induce out of plane stretching of the high viscous fluid and obtaining a plurality of high aspect ratio structures between the top cell plate and the bottom cell plate due to the penetration of the low-viscous fluid.

The invention discloses a viscoelastic fluid heat flow coupling topological optimization method for micro-channel system design. The method comprises the following steps: firstly, carrying out pretreatment, defining a viscoelastic fluid constitutive model, defining material attributes and carrying out finite element analysis; then constructing boundary conditions of the heat flow coupling topological optimization model; constructing a viscoelastic fluid heat flow coupling topological optimization mathematical description model, then constructing an optimization model, and finally verifying the topological optimization design result of the viscoelastic fluid system. According to the method, the heat flow coupling calculation of the viscoelastic fluid is carried out through the logarithmic tensor reconstruction method, and a relatively accurate analysis result can be obtained under a high Vesceng number; and in combination with a variable density topological optimization method with high design degree of freedom, a new configuration of a micro-channel system structure is obtained, and a new solution idea is provided for heat dissipation of a micro electronic component with high heat flux.

The present disclosure relates to a method and device for predicting the inflow performance of composite flooding in stages, including: obtaining well parameters, production performance parameters, formation parameters, and fluid parameters of target wells in the work area; establishing a basic differential equation for the seepage of viscoelastic fluids in porous media; determining the outer boundary position and outer boundary pressure value of the viscoelastic fluid in the target well formation, and determining the definite solution conditions of the seepage model of the viscoelastic fluid in porous media according to the outer boundary position and outer boundary pressure value; determining a comprehensive correction coefficient according to the formation parameters; solving the basic differential equation according to the above parameters and definite solution conditions to obtain the prediction results of the inflow performance of single wells in different development stages in the work area. To solve the problem that the existing prediction method for the inflow performance of composite flooding is solved based on the single-phase seepage model of chemical displacement agents, ignoring the important role of the oil phase in the seepage process and the stage change of formation fluids, resulting in low accuracy of prediction results.

The invention discloses a polymer flooding whole-process recoverable reserve prediction method, which comprises comprehensive water content prediction of a target block, and the comprehensive water content prediction method comprises the following steps: determining an analogy block of the target block, according to the water content-time curve of the analogy block, four stages of blank water drive, water content reduction, water content recovery and subsequent water drive are divided; taking the water content at the end of the blank water drive period of the analogy block as an initial water content starting point, utilizing a support vector machine algorithm, taking geological indexes including a comprehensive water content index and development indexes of the analogy block as training feature data, and obtaining an SVR prediction model through SVR regression; using the SVR prediction model to solve the comprehensive water content of the target block in the water content decline stage and the water content rise stage; the method effectively solves the problems that the mathematical model of the polymer underground non-power law type viscoelastic fluid is difficult to express and the recoverable reserves in the polymer flooding injection stage are difficult to accurately predict.

The present invention discloses an emergency drainage manhole cover and an emergency drainage method, belonging to the field of urban flood control and waterlogging prevention. The emergency drainage manhole cover includes: a cover body, a filtering device, and a surfactant, where the surfactant is a water-soluble polymer material; the cover body is provided with drainage holes, and the filtering device is installed below the cover body; the surfactant is filled in the filtering device so as to dissolve in water when water flows through the drainage holes and the filtering device, making the water become a viscoelastic fluid and enter the drainage pipeline. The emergency drainage manhole cover of the present invention can release the surfactant to dissolve in water during the water seepage process, change the physical properties of the water flow, thereby reducing the resistance suffered by the water flow, enabling the drainage pipeline to have a stronger drainage capacity, and effectively avoiding the occurrence of urban waterlogging.

A method for measuring the material properties of a viscoelastic fluid using one or more vibrating transducers, the method comprising: vibrating one or more vibrating transducers within the viscoelastic fluid so as to generate a first wave propagating from a first surface of the one or more vibrating transducers and a second wave propagating from a second surface of the one or more vibrating transducers; during vibration of the one or more vibrating transducers, the first surface and the second surface being spaced apart from and oriented with respect to each other such that the first wave and the second wave combine with each other to produce a final constructive or destructive interference; and determining the material properties of the viscoelastic fluid based on the vibration of the one or more vibrating transducers within the viscoelastic fluid.

Provided is an active vibration damping device including: an outer cylinder; an inner cylinder disposed on an inner peripheral side of the outer cylinder; a magnetic field generator that generates a magnetic field; a magnetic body that forms a magnetic path by the magnetic field; a first liquid chamber filled with a magneto-viscoelastic fluid; a second liquid chamber adjacent to the first liquid chamber and filled with liquid, wherein the magnetic field generator, the magnetic body, the first liquid chamber, and the second liquid chamber are provided between the inner cylinder and the outer cylinder in the radial direction, the first liquid chamber and the second liquid chamber are partitioned by a flexible member, the flexible member extends in an axial direction of the inner cylinder, and a part of the first liquid chamber forms a flow path for the magnetic viscoelastic fluid positioned on the magnetic path.

This invention relates to the field of oilfield chemistry, and particularly to a diverting agent based on thermally reversible dynamic covalent bonds, its preparation method, and its application. The diverting agent is a polymer cross-linked via dynamic covalent bonds, which are constructed by thermally controlled Diels-Alder and reverse Diels-Alder reactions. The polymer is copolymerized from hydrophilic monomers containing double bonds and a dynamic covalent cross-linking agent containing double bonds. The dynamic covalent cross-linking agent containing double bonds is a polymerizable compound containing furan or cyclopentadienyl groups. During the plugging stage, under high-temperature conditions in deep or ultra-deep oil and gas reservoirs, the material transforms from rigid particles into a viscoelastic fluid, forming a temporary plugging layer at the pore or fracture entrance of high-permeability layers. During the degradation stage, pumping in a depolymerizing fluid triggers a reverse Diels-Alder reaction, achieving complete degradation. This solves the problem of poor temperature resistance and low strength of diverting agents, which cannot meet the needs of balanced oil and gas field development in deep or ultra-deep oil and gas reservoirs.

The application discloses a graphene preparation method based on interlayer stress resonance. Macroscopic mechanical rotation energy is converted into high-frequency and directional stress energy which can precisely act on the van der Waals force between graphite layers through a series of carefully designed physical processes. Under specific rotation conditions, unstable vortex structures (such as Taylor vortex flow) are generated in the confined fluid. When the stress wave formed by the vortex in the viscoelastic fluid is coupled with the intrinsic vibration frequency between the graphite layers, resonance phenomenon is triggered. The resonance can amplify the strain energy between the graphite layers, so that the interlayer van der Waals force is efficiently and selectively overcome under the condition of energy input far lower than the in-plane fracture threshold of carbon-carbon bond, and the graphene is exfoliated to obtain large and few-layer graphene.

The invention provides functional oil displacement fracturing fluid based on physical crosslinking as well as a preparation method and application of the functional oil displacement fracturing fluid. The preparation method of the fracturing fluid comprises the following steps: adding acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and N, N-dimethylacrylamide into water, adjusting the pH value of a system to 5-8, adding a dispersing agent, and then adding N-dodecyl acrylamide to obtain a water phase; adding an emulsifier into the white oil to obtain an oil phase; adding the water phase into the oil phase, and emulsifying to obtain an emulsion; adding an initiator into the obtained emulsion, and reacting; after the reaction is completed, adding a phase inversion agent to obtain an emulsion type resistance reducing agent; and adding the PCL-PEG-PCL into water, then adding the emulsion type resistance reducing agent, and stirring until the solution becomes a viscoelastic fluid, thereby obtaining the product. The fracturing fluid provided by the invention has the advantages of high sand-carrying property, low damage and high oil displacement property, and can solve the problems of poor sand-carrying property, flowback fluid pollution, difficult gel breaking, reservoir pollution and the like of the traditional fracturing fluid.

The invention relates to a pile foundation pore-forming slurry construction method suitable for a phyllite stratum, and belongs to the technical field of phyllite stratum slurry construction. Sodium carbonate is accurately proportioned to adjust the pH value so as to inhibit rock stratum hydrolysis, bentonite is matched to improve the colloid rate so as to form a compact slurry cake, polyanionic cellulose is introduced as an intelligent conditioning agent, and the pile foundation pore-forming slurry construction method suitable for the phyllite stratum is prepared. The molecular chain structure can form a three-dimensional network to enhance the wall protection effect when a stratum is broken, construction sections are divided according to the integrity of the stratum, a basic formula is adopted for stabilizing the stratum to ensure the hole forming efficiency, a cellulose additive is actively activated in a broken zone to form viscoelastic fluid, and then through combined purification of a positive circulation system and a sediment separator, the construction efficiency is improved. The sand content is strictly controlled, the mud suspension force and the stratum seepage pressure are dynamically balanced in cooperation with specific gravity adjustment, and the problem that the mud performance of the phyllite stratum is dynamically matched with the geological conditions is systematically solved through a synergistic mechanism of formula optimization, staged application, circulating purification and dynamic regulation and control.

The invention discloses an electric field-viscoelastic micro-fluidic focused nanoparticle system with temperature controlled by dry ice. The electric field-viscoelastic micro-fluidic focused nanoparticle system comprises a micro-fluidic chip, a PMMA (polymethyl methacrylate) transparent heat insulation layer, the dry ice, a viscoelastic micro-fluidic chip matched with the dry ice, an electric field and a visual experiment system. According to the method, temperature control, viscoelastic fluid and an external direct-current electric field are combined to control small-size nanoparticles, and the temperature field of the micro-fluidic chip is regulated and controlled through dry ice and PMMA thickness, so that the temperature rise of the channel and the chip caused by the Joule heating effect of the external direct-current electric field in the channel fluid is eliminated; further, stable and continuous focusing of the nanoparticles by a high-voltage electric field-viscoelastic microfluidic method is promoted. Meanwhile, the temperature field is regulated and controlled by the dry ice, so that the temperature-sensitive particles can be protected from being damaged by high temperature during operation. The high-voltage electric field-viscoelastic microfluidics using the dry ice to control the temperature can effectively focus the nano-particles at high flux under high electric field intensity, so that accurate control, focusing and enrichment of the small-size nano-particles are realized.

The invention provides an active anti-vibration device capable of suppressing performance degradation caused by precipitation of magnetic powder based on a magneto-viscoelastic fluid in a liquid chamber without increasing the volume of the liquid chamber filled with the magneto-viscoelastic fluid. In the active anti-vibration device (1), an electromagnetic coil (12) as a magnetic field generating unit, an outer member (61) as a magnetic body, an inner member (62) as a magnetic body, a first liquid chamber (15), and a second liquid chamber (21) are provided between an inner cylinder (3) and an outer cylinder (2) in the radial direction. The first liquid chamber (15) and the second liquid chamber (21) are separated by a flexible member (14) extending in the axial direction of the inner cylinder (3), and the flexible member (14) is supported by an outer member (61) that is a magnetic body.

The invention discloses a graphene preparation method based on interlayer stress resonance. Macroscopic mechanical rotation energy is converted into high-frequency and directional stress energy capable of accurately acting on Van der Waals force between graphite layers through a series of well-designed physical processes. Under a specific rotation condition, an unstable vortex structure (such as Taylor vortex) can be generated in a limited fluid, and when a stress wave formed by the vortex in a viscoelastic fluid is coupled with an intrinsic vibration frequency between graphite layers, a resonance phenomenon can be caused. The resonance can amplify the strain energy between the graphite layers, so that the Van der Waals' force between the layers is efficiently and selectively overcome under the energy input condition far lower than the in-plane fracture threshold of the carbon-carbon bond, the graphene is delaminated, and the large-piece and few-layer graphene is obtained.

The application relates to the field of exploration geophysical seismic fluid identification, in particular to a frequency-variable solid-liquid decoupling viscoelastic fluid factor prestack seismic inversion method. The method comprises the following steps: step 1, carrying out equal-interval frequency division processing on seismic data; step 2, carrying out frequency division elastic impedance inversion by using the frequency division seismic data in step 1; step 3, frequency-variable solid-liquid decoupling fluid factor inversion equation construction; step 4, carrying out frequency-variable solid-liquid decoupling fluid factor inversion equation coefficient inversion for each prestack angle stack and sampling point; and step 5, frequency-variable solid-liquid decoupling fluid factor inversion. The method improves the fluid factor inversion precision on the basis of conventional solid-liquid decoupling fluid factor inversion by establishing a reference frequency and frequency division frequency calculation process.

The invention belongs to the technical field of fluid mixing, and discloses a multi-stage leaf-shaped static mixer for mixing viscoelastic fluid and Newtonian fluid, and multi-stage mixing units which are sequentially connected end to end in the longitudinal direction are arranged between a fluid input channel and a fluid output channel; the fluid input channel is used for connecting the Newtonian fluid inlet and the viscoelastic fluid inlet, and the fluid output channel is used for leading out mixed liquid; the mixing unit is a flat shell composed of an upper surface, a lower surface, a first outer contour surface, a first inner contour surface, a second outer contour surface and a second inner contour surface, and an upstream confluence area, a shunting area and a downstream confluence area are sequentially formed between the first outer contour surface and the first inner contour surface and between the second outer contour surface and the second inner contour surface. According to the invention, the viscoelastic fluid can be rapidly mixed under the condition of low shear disturbance, so that the fluid forms secondary vortex and spiral flow along the main flow direction in the mixing area, and the mixing rate of the viscoelastic fluid and the Newtonian fluid is obviously improved.

The application is a method and system for constructing a wide-temperature-range constitutive model of a viscoelastic fluid in a space environment, which relates to the cross-technical field of computational materials science, aerospace tribology and fluid dynamics, and comprises the following steps: performing sinusoidal shearing on a balanced full-atom model at multiple key temperature points, simulating the dynamic response under sinusoidal shearing to obtain original strain time series data and original stress time series data, performing filtering and smoothing processing and feature extraction to obtain waveform features, and calculating shear rate time series data; inputting the filtered and smoothed original strain time series data and the shear rate time series data into a constitutive mathematical model to obtain predicted stress, minimizing the error between the predicted stress and the filtered and smoothed original stress time series data for multi-stage optimization, and obtaining a wide-temperature-range constitutive model of a viscoelastic fluid. The application solves the technical problem that the constitutive model is difficult to obtain rheological parameters of a space lubricating fluid under wide-temperature-range and large-amplitude shearing, resulting in low prediction accuracy.

The invention provides a medical waterproof adhesive as well as a preparation method and application thereof. The preparation method of the medical waterproof adhesive comprises the following steps: firstly preparing solid gel, and then adjusting the rheological property of the solid gel to obtain the viscoelastic fluid waterproof adhesive. The preparation method of the adhesive provided by the invention is simple and convenient to operate, controllable in process, high in repeatability and low in cost. The prepared waterproof adhesive is stable in performance, shows good injectability and spreadability at normal temperature, and is convenient for surgical operation; in a wet ocular surface environment, a pre-formed network can effectively resist immediate flushing and dilution of body fluids such as tears, aqueous humor and blood, so that stable residence and accurate positioning on the surface of a target tissue are ensured; under the irradiation of a light source with specific wavelength, the gel is subjected to polymerization reaction, a compact and firm secondary cross-linked network is quickly formed under a wet condition, and stable and reliable in-situ solidification and tissue adhesion are realized.

A toy kit includes a container, a toy configured to be disposed within the container and having a coating configured to be dissolved in a liquid, and a powder material. The powder material, the coating dissolved by the liquid, and the liquid are configured to mix to provide a viscoelastic fluid.

This invention discloses a microfluidic chip for pre-focused cell sorting. Newtonian and viscoelastic fluids are introduced into different inlets of the chip. Through the polygonal flow channel shape within the microfluidic chip, a stable viscoelastic-Newtonian interface is generated by the co-flow of the two solutions. The inertial and viscoelastic effects generated within the microfluidic channels induce inertial lift at the microchannel walls and viscoelastic lift in the viscoelastic solution, both acting on the cell particles within the channels. Furthermore, the driving forces for the passive separation of cell particles, such as inertial and viscoelastic lift, strongly depend on the particle diameter. Particles of different diameters are affected by different resultant forces. Therefore, cell particles of different diameters accumulate different distances during migration within the microchannels, pre-arranging the lateral migration patterns of the particles and ultimately achieving sorting at different channel outlets.

A viscoelastic fluid composition includes a viscoelastic surfactant composition ranging from about 0.1 wt. % to about 10 wt. % based on a total wt. % of the viscoelastic fluid composition. The viscoelastic fluid composition further includes crystalline sodium sulfate cellulose (NaSC) nanoparticles ranging from about 0.1 wt. % to about 10 wt. % based on the total wt. % of the viscoelastic fluid composition.

The invention discloses a temperature-sensitive magnetic bead, a preparation method thereof and related application of the temperature-sensitive magnetic bead in early cancer screening, and the temperature-sensitive magnetic bead is prepared by taking an unsaturated superparamagnetic bead with vinyl on the surface as a matrix through an in-situ free radical polymerization mode. N-isopropylacrylamide, acrylamide and oligomeric (ethylene glycol) methyl ether methacrylate are initiated to be copolymerized on the surfaces of the magnetic beads to form a temperature-sensitive polymer brush layer with an adjustable low critical solution temperature (LCST). The temperature-sensitive magnetic beads are in a hydrophobic collapsing state under the condition of 37-39 DEG C, are maintained in a viscoelastic fluid state beneficial to dynamic replacement of low-abundance proteins, and can efficiently adsorb the low-abundance proteins in plasma; the temperature-sensitive magnetic beads are rapidly converted into a hydrophilic stretching state at the temperature lower than 36 DEG C, and the multi-point interaction between the proteins and the temperature-sensitive magnetic beads is synchronously weakened by utilizing micromechanical ejection force generated by phase change, so that the proteins are completely eluted from the surfaces of the magnetic beads.

The invention provides a method for calculating a stabilized viscoelastic fluid-solid coupling problem based on an overlapped grid, and relates to the technical field of fluid-solid coupling calculation, the method comprises the following steps: processing a flow field region and solid particles to obtain an interpolation boundary, a contribution unit and an interpolation unit, and carrying out flow field calculation on a background grid to obtain background grid flow field information; transmitting the background grid flow field information to the sub-grids to obtain the flow field information of the sub-grids; calculating by using the flow field information of the sub-grids through a finite element method to obtain updated flow field information of the sub-grids; transmitting the updated sub-grid flow field information to a background grid by using bilinear Lagrange interpolation to obtain updated background grid flow field information; based on the updated background grid flow field information, parameter iteration updating is carried out through calculation, and simulation data of the motion trail and the rotation state of the solid particles in the flow field area are obtained. According to the method, the problems of low precision and low efficiency of fluid-structure interaction calculation are solved.