34 results about "Shear field" patented technology

A lubricant composition having an enhanced thermal conductivity, up to 80% greater than its conventional analogues, and methods of preparation for these fluids are identified. One preferred composition contains a base oil, nanomaterial, and a dispersing agent or surfactant for the purpose of stabilizing the nanomaterial. One preferred nanomaterial is a high thermal conductivity graphite, exceeding 80 W/m in thermal conductivity. The graphite is ground, milled, or naturally prepared to obtain a mean particle size less than 500 nm in diameter, and preferably less than 100 nm, and most preferably less than 50 nm. The graphite is dispersed in the fluid by one or more of various methods, including ultrasonication, milling, and chemical dispersion. Carbon nanostructures such as nanotubes, nanofibrils, and nanoparticles are another type of graphitic structure useful in the present invention. Other high thermal conductivity carbon materials are also acceptable. To confer long-term stability, the use of one or more chemical dispersants or surfactants is useful. The thermal conductivity enhancement, compared to the fluid without graphite, is proportional to the amount of nanomaterials added. The graphite nanomaterials contribute to the overall fluid viscosity, partly or completely eliminating the need for viscosity index improvers and providing a very high viscosity index. Particle size and dispersing chemistry is controlled to get the desired combination of viscosity and thermal conductivity increase from the base oil while controlling the amount of temporary viscosity loss in shear fields. The resulting fluids have unique properties due to the high thermal conductivity and high viscosity index of the suspended particles, as well as their small size.

The invention provides an apparatus for comminuting coal or other fuel solids in a shear field, and for optionally coating the solids with catalysts for combustion, liquefaction, and or gasification during the milling process. The apparatus further provides for control of water content in the solids may be controlled before, during and after the milling in order to obtain micronized solids with fine hydration layers. The output fuel solids of the apparatus can burn at low temperatures, avoiding emissions of nitrogen oxides, and they also have improved properties for surfactant-free suspension in either water or oil media, as well as for liquefaction and gasification.

The invention relates to a measurement system for obtaining a single molecular spectrum and imaging under a shear field, characterized in that the measurement system includes: an excitation light source unit used as excitation light to irradiate a sample to be tested; a unit for applying a mechanical A shear application and rheological measurement unit for simultaneously measuring its macroscopic rheological properties; and an optical microscopic unit, the optical microscopic unit is used to introduce the excitation light emitted by the excitation light source unit into the waiting area under the shear field. The sample is measured, so that the dye molecules of the sample to be tested are excited to generate fluorescent signals, and the generated fluorescent signals are collected and respectively transmitted to a single-molecule fluorescence imaging unit, a single-molecule fluorescence emission spectrum measurement unit and/or a fluorescence correlation spectrum measurement unit . The invention can be widely applied to polyelectrolyte dilute solution, gel, interfacial diffusion, film imaging and other multi-charge condensed state systems, and explores the basic physical origin of its special properties.

The invention relates to a stable photo-responsive Pickering emulsion with photosensitive POSS hybrid particles as an emulsifying agent and a preparation method. Octa(gamma-chloropropyl) POSS serves as an initiator, an azobenzene-containing double-bond compound serves as a monomer, and the photosensitive POSS hybrid particles are prepared through the atom transfer radical polymerization (ATRP) method. The water-in-oil (W/O) type Pickering emulsion is obtained through shear field emulsification. The method is simple, feasible, high in operability and capable of being applied to the field of cosmetics. Through external stimuli, the emulsion is demulsified and release moisture of an internal phase so that skin can be moistened or prevented from being harmed by ultraviolet rays. The emulsion can also be applied to the field of drug sustained release, and through UV irradiation, controllable release of internal phase medicine is achieved. Accordingly, the emulsion can be widely used in the fields such as cosmetics, biology and pesticide delivery, and has very good application and popularization value.

The invention discloses a preparation method of a fully degradable high-strength and high-barrier polylactic acid film. The method is to firstly melt and blend polylactic acid and PBS under strong shear, so that the PBS droplets are violently broken into nanoparticles in the matrix. The strong tensile/shear field transforms PBS nanoparticles into nanofibers, and finally uses the "confined sheet" method to transform PBS nanofibers into regular and dense PBS nanosheets in a molding machine or a twin-roller continuous extrusion molding device, A polylactic acid high-strength and high-barrier film containing PBS nanosheets was obtained. The polylactic acid film products containing PBS nanosheets prepared by the present invention retain the good biodegradability of PBS and polylactic acid on the one hand, and on the other hand, a large number of oriented and straightened PBS nanosheets can block the infiltration of gas/water molecules and act as self-reinforcement The structural unit obtains simultaneous improvement of mechanical properties and barrier properties.

The invention provides a liquefaction process using comminuted fuel solids from a steam-driven shear field, with controlled water content and optionally coated with a catalyst. The method allows fuel solids to be liquefied efficiently during comminution or when they are supplied in the form of a slurry or as free-standing solids.

The invention belongs to portable temperature control cone board shearing pool; it is a device for research the crystallization and separation behavior of object combining with micropolariscope, phase difference microscope, fluorescent microscope, laser scattering and X ray scattering technologies under even shearing field, the research with the device to polymer system can provide reliable gist and theory instructions for designing of polymer material.

The invention discloses a three-stage thixotropy test method for characterizing thixotropic fluid rheology. By improving the characterization method of three-stage thixotropic fluid, the method realizes the in-situ obtaining of a viscoelastic spectrum at the structural destruction and recovery stage while the traditional 3ITT test is performed; evolution of the obtained viscoelastic spectrum alongwith time completely characterizes the structural change of a thixotropic fluid material in a process of structural failure and recovery, so that the real-time change information of a microstructureof the material under a shear field can be obtained, and guidance with an important reference value is provided for the production, processing and application of high thixotropic fluid materials.

The invention relates to original location observation system under the shear field with laser light scattering and microscopy, and the system can also be used to liquid-crystal, emulsion, and other system's research under the shear field. The system includes laser light scattering and microscopy system, and the two systems share the sample pool with the heater on a platform, and precision controllable shear field imposed devices and total reflection coating mirror. The invention can precisely impose fixed or variable rate shear field to precise temperature experimental samples (polymer melt or solution, polymer blends alloy, etc.). Using stable output laser as light scattering source, through the lens group and CCD array detector to obtain the reflection form of reciprocal space and scattering patterns of structure, and meanwhile, in the same experimental conditions, switched to the microscope optical path, to obtain the shape and structure of real space, and comparing the obtained microscope pattern after FFT transfer with the corresponding scattering pattern, to verify generated concrete shape and structure under the shear field.

The invention relates to a method for preparing a high-performance dielectric material through external field auxiliary particle arrangement, and aims to improve the relative dielectric constant of the material and reduce the dielectric loss or maintain the dielectric loss in a low range. According to the method, conductive filler and high-dielectric ceramic filler are mixed into a polymer matrix,and particles are assisted to move in the matrix under the action of an external field (such as an electric field, a magnetic field and a shearing field) to obtain an oriented structure in directional arrangement. The dielectric constant of the material is greatly improved by a large number of micro capacitors formed by the oriented conductive filler, and the dielectric loss of the material is reduced by the ceramic particles doped in the oriented structure. The high-performance dielectric material prepared by the method has a huge application prospect in the fields of wearable equipment, dielectric elastomers, supercapacitors and the like.

A method of making a polymeric compound, comprising discrete particles responsive to an external stimulus, that is resistant to aggregation in high-shear fields, which includes the addition of a polymerization initiator to a reaction mixture comprising a monomer corresponding to the polymeric compound, wherein the method comprises the portion-wise addition of aliquots of a cross-linking agent to the reaction mixture, wherein an aliquot of the cross-linking agent is added to the reaction mixture both before the addition of the polymerization initiator and after the polymerization has progressed substantially to completion. The polymer particles are largely immune to the effects of transient shear rates at least as high as 10⁶ s⁻¹, whilst maintaining their thermal responsiveness and being present at moderate concentration. The structural and chemical modifications brought by the delayed portion-wise addition of the cross-linking agent allow an improvement in stability in a high-shear field.

The present invention provides a dosing and dispensing system, comprising a liquid detergent composition and a dosing and dispensing device, wherein the liquid detergent composition is a non-Newtonian fluid having zero-shear viscosity of at least 10,000 mPa·s and a viscosity under a shear field of 10 s⁻¹ of at most 5000 mPa·s. The device comprises a hollow body containing the liquid detergent composition and dispensing means comprising a freely rotatable ball for spreading at least a portion of the liquid detergent composition onto fabrics. This system which is suitable for both pretreatment of fabrics and use in the main wash, allows for a simple, safe and leak-free operation.

The invention relates to the field of testing devices, and discloses a discrete material shearing device which comprises a shearing box, a first driving mechanism, a second driving mechanism and a third driving mechanism, the shearing box is provided with an upper box body and a lower box body which are connected in a sliding mode, and the top of the upper box body is connected with the first driving mechanism; the left side of the upper box body is connected with a second driving mechanism, and the right side of the lower box body is connected with a third driving mechanism, so that the shear box bears acting force in multiple directions. The device has the beneficial effects that a sand sample for an experiment can be accommodated in the shearing box, dynamic shearing in three directions is realized through cooperation of the first driving mechanism, the second driving mechanism and the third driving mechanism, the engineering problem of foundation shearing damage caused by dynamic loads such as earthquakes and wave impact is simulated more accurately, and the experiment efficiency is improved. And different discrete material shearing scenes can be better restored.