摘要:
An apparatus for microfiltration and a scalable method for manufacture of an inertial microfluidic device for such microfiltration apparatus are provided. The apparatus for microfiltration includes one or more inertial microfluidic devices, each including a plurality of spirals of a microfluidic channel. At least one of the inertial microfluidic devices is configured to utilize outer wall focusing for high volume fraction microfiltration of particles. The scalable method for manufacture of the inertial microfluidic device includes micromachining on a polycarbonate-based substrate a rectangular spiral microchannel having one or more input channels and a plurality of output channels configured to utilize high volume fraction outer wall focusing for microfiltration of particles.
摘要:
A compact and portable multi-stage centrifuge apparatus comprising a cart, a housing mounted onto the cart, and an engine mounted onto the cart adjacent to the housing, wherein the housing comprises an inlet in the top of the housing, an outlet in the wall of the housing, and a bowl contained within the housing, wherein the bowl comprises an engagement member that is operatively coupled to the engine's drive shaft, such that the bowl can be rotated by engaging the engine, thus removing undesirable materials from the bowl and out of the housing through the outlet.
摘要:
A spiral microchannel particle separator includes an inlet for receiving a solution containing particles, at least two outlets, and a microchannel arranged in a plurality of loops. Particles within a solution flowing through the spiral microchannel experience a lift force FL and a Dean drag force FD. The spiral radius of curvature R and the hydraulic diameter Dh of the spiral microchannel are such that for a flow rate U of the solution, the lift force FL and a Dean drag force FD are approximately equal and act in opposite directions for particles of a first size. The particles of the first size are focused in a single stream located at an equilibrium position near an inner wall of the microchannel. In another embodiment, a straight microchannel particle separator separates particles by modulating shear rates via high aspect ratios that focuses particles of a first size along two first walls.
摘要:
Provided is method of selectively separating carbon nanotubes into metallic carbon nanotubes and semiconducting carbon nanotubes, the method including: preparing a mixture including a dispersant, carbon nanotubes, and a solvent; dispersing the carbon nanotubes in the mixture; and separating the semiconducting carbon nanotubes from the mixture in which the carbon nanotubes are dispersed, wherein the dispersant is an oligomer including about 2 to about 24 repeat units, each including a head moiety and a tail moiety, wherein the head moiety comprises 1 to about 5 aromatic hetero rings, and the tail moiety comprises a hydrocarbon chain or chains connected to the head moiety.
摘要:
A system to facilitate separation and concentration of particles based on centrifugal force on suspended particles, including biological matter, which are made to flow in a vortex structure is provided. The centrifugal force urges larger particles to collect along outer portions of the vortex flow. Conversely, within a vortex structure, a radial hydrodynamic pressure drop is also amplified to urge smaller particles toward inner portions of the vortex flow. This force created by the pressure can reach magnitudes that encourage a sharp cut-off and improved resolution discrimination between particle sizes. Thus, separated streams of particles can be collected with both increased concentration and purification.
摘要:
The present invention is directed to a system and method for continuously or substantially continuously separating particulate matter based on particle size and/or density of the matter. The system includes a separation chamber having a bottom portion disposed within a cavity of a rotatable bowl having fluid therein, preferably water. The internal cavity of the separation chamber is maintained under negative pressure such that fluid is drawn through the separation chamber at a predetermined velocity to separate the solids. Larger, dewatered and/or denser solids are directed to the cavity of the rotatable bowl and can be removed by rotation of the bowl while the smaller and/or less dense solids and fluid travel up through the separation chamber.
摘要:
The separation of dissolved and/or undissolved materials having different densities or different buoyancy densities can be effected with the aid of agents comprising solutions of true metatungstates. In the case of a separation of materials having different buoyancy densities by means of a density gradient centrifugation, the agent has the form of an aqueous solution of an alkali, ammonium or alkaline earth metal metatungstate and, if desired, may be augmented by the addition of at least one low molecular weight electrolyte. The agent can have a density of up to 3.1 g.cm.sup.-3, has a low viscosity at high concentrations, and is neutral and chemically insert. In the case of a separation of water-insoluble solid mixtures of different densities, the densities of the solutions of the true metatungstates can be increased up to 4.6 g.cm.sup.-3 by adding to the solutions high density materials such as sodium tungstate or tungsten carbide of suitable grain size so as to form a suspension.
摘要翻译:借助于包含真正的偏钨酸盐溶液的试剂,可以分离具有不同密度或不同浮力密度的溶解和/或未溶解材料。 在通过密度梯度离心分离具有不同浮力密度的材料的情况下,试剂具有碱金属,铵或碱土金属偏钨酸盐的水溶液的形式,并且如果需要,可以通过加入增加 的至少一种低分子量电解质。 该试剂的密度可达3.1g·cm-3,在高浓度下具有较低的粘度,且为中性和化学插入。 在分离不同密度的水不溶性固体混合物的情况下,通过向溶液中加入高密度材料如钨酸钠或钨,可以将真正的偏钨酸盐溶液的密度增加至4.6g / cm 3 碳化物合适的晶粒尺寸以形成悬浮液。
摘要:
Method of removing coarse materials and chemical and mineral impurities from clay in order to produce a purified high solids suspension of said clay which method involves mixing a crude clay with water and a dispersing agent to form a high solids slurry; subjecting said slurry to intense centrifugal forces for a short period of time; separating said coarse material and said chemical and mineral impurities; and recovering the suspended clay as a fine fraction having a reduced content of coarse material and impurities.
摘要:
962,386. Centrifugal classifiers. INSINOORITOIMISTO - ENGINEERING BUREAU R. T. HUKKI. April 8, 1963, No. 13847/63. Heading B2P. An open-topped vessel for the continuous hydraulic classification of pulps and suspensions of finely divided solid particles comprises a cylindrical top portion 1, a conical bottom portion 2, a pipe 13 for admitting feed, preferably by gravitational flow, a rotary impeller 4 for imparting circular motion to the feed in the portion 2 and for effecting discharge of the coarse size fraction via the apex of the cone, and braking means to eliminate the circular motion of the feed within an annular layer situated against the inside wall of the portion 1, whereby the fine size fraction is obtained in the form of an ascending, substantially laminar, continuous flow over the edge 10 of the portion 1 and is collected into a launder 11. The diameter of the top portion 1 may be smaller than that of the top of the conical portion 2. The braking means comprise vanes 8 mounted on an open-topped cylinder 8 which may be provided with a truncated cone 7 at its lower end. The braking means may be vertically adjustable and may be so designed as to provide a narrowing annular channel for the ascending fine fracton flow. The vanes 8 may be angularly adjustable. The coarse fraction may be washed by water admitted tangentially under pressure through a pipe 12. A manually or automatically operated valve 5 is provided for the discharge of the coarse fraction. A number of classifiers may be arranged in series or parallel.