CN106310944A - Dielectrophoresis electrode and electrode array used for separating particles and droplets in medium - Google Patents
Dielectrophoresis electrode and electrode array used for separating particles and droplets in medium Download PDFInfo
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- CN106310944A CN106310944A CN201510379158.9A CN201510379158A CN106310944A CN 106310944 A CN106310944 A CN 106310944A CN 201510379158 A CN201510379158 A CN 201510379158A CN 106310944 A CN106310944 A CN 106310944A
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Abstract
The invention relates to a dielectrophoresis electrode used for separating particles and droplets in a medium. The dielectrophoresis electrode comprises a metal profile. The cross section of the metal profile has a shape with protrusions. The protrusions form the ridgelines of the dielectrophoresis electrode. The invention also relates to an electrode array formed by electrodes arranged in parallel. With the dielectrophoresis electrode array provided by the invention, electrodes of different groups can be respectively connected on the two ends of an AC power supply, such that a dielectrophoresis effect can be formed within a relatively large scale range. For fluid in or passing the electric field coverage of the array, electrically neutral particles contained in the fluid can be selectively separated or enriched. The electrode array can be used in rapid settlement of the field of environmental engineering, removing of suspended impurities in gas, de-emulsification and purification of petroleum and crude oil, and the like.
Description
Technical field
The present invention relates to environmental protection technical field, a kind of dielectrophoresis electrode for separating medium endoparticle and droplet and electrod-array.
Background technology
The translational motion that the electric neutrality granule being in non-well-balanced electric field that dielectrophoresis describes produces due to the effect of dielectric polarization.The dipole moment produced on granule can be represented by two identical carried charges but opposite polarity electric charge, when they mal-distributions on granular boundary, produces a macroscopical dipole moment.In this dipole moment is positioned at unshapeliness electric field, the different of the local electric field strength on granule both sides produce resulting net force, referred to as a dielectrophoresis force.Owing to the granule that is suspended in medium has different dielectric properties (dielectric constant) from medium; granule can move towards the direction that electric field intensity strengthens; it is referred to as positive dielectrophoresis, otherwise if the direction that granule weakens towards electric field intensity is moved, the most negative dielectrophoresis.
When granule, (radius r, relative dielectric constant are εp, conductivityσp) (relative dielectric constant is ε to be suspended in fluid media (medium)f, electrical conductivity be σf) time, its dielectrophoresis force received is:
In formula: (here: )；E is the root-mean-square of electric field strength；ε0It it is permittivity of vacuum；ω is electric field angular frequency.DEP force direction will depend upon which k*(ω) real part, i.e. the CM factor, at CM > 0 time be positive dielectrophoresis, particle moves to high electric field region from low electric field region, otherwise be feminine gender dielectrophoresis.
In prior art, air cleaning generally uses Cottrell process, it is to utilize electrophoresis (electrophoresis, EP) principle, the gas molecule in air is made to ionize in high-voltage dc, produce a large amount of electronics and ion, move towards the electrode the most contrary with electronics and ion under the effect of electric field force.Encountering the dust granules in air-flow in moving process makes it charged, Charged granule in electric field force effect to electrode movement, it is achieved solids or liquid particle separate with air-flow.Industrial wide variety of be tube-type esp and Elex precipitator.
Unlike electrophoretic techniques:
(1) what dielectrophoresis was handled is electric neutrality granule so that it is the translational motion produced due to the effect of dielectric polarization；What electrophoresis was handled is electronics and ion so that it is load produces displacement on dust granules.
(2) in dielectrophoresis, particle motion is unrelated with the direction of electric field, and dielectric constant the most with itself is relevant with the dielectric constant of medium；In electrophoresis particle motion depend on granule charged symbol and the direction of electric field, direction of an electric field invert then the direction of motion reversion.
(3) dielectrophoresis needs inhomogeneous field；Electrophoresis all can occur in field uniform or heterogeneous.
(4) size of dielectrophoresis force be proportional to particle diameter cube；It is charged how much that the size of electrophoretic force is proportional to granule institute.
Chinese patent: a kind of dielectrophoresis electrode structure (application number: 201410407467.8, the applying date: 2014.08.19) disclose a kind of electrode with chi structure, understood by " a part of wire connecting power positive pole in described first wire group; another part connects power cathode " of claim 1 and description [0005th] section, in the application, be passed through is DC source (only DC source inborn ability both positive and negative polarity) to this electrode.Although applicant illustrates that in description [0006th] section this electrode structure can produce non-uniform electric field, but this non-uniform electric field can not sustainable existence from principle.
After the electrode in medium is passed through unidirectional current, because the charged particle that can not offset is due to foregoing electrophoretic effect, converging in opposite polarity electrode surface, produce the effect being similar to electrostatic screen, external electronic field is reduced to 0.Producing the effect of non-uniform electric field between thus not reaching in the electrodes, the most above-mentioned setting does not reaches goal of the invention.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of dielectrophoresis electrode for separating medium endoparticle and droplet, and the electrod-array that the electrode arranged by array parallel is constituted；The electrode of difference group can be connected to the two ends of alternating current power supply, dielectrophoresis effect can be formed in a big way.
The present invention its technical problem of determining is achieved through the following technical solutions:
A kind of dielectrophoresis electrode for separating medium endoparticle and droplet, it is characterised in that: described dielectrophoresis electrode includes that shape, the cross section of described shape are with protruding shape, the described protruding crest line constituting described dielectrophoresis electrode.
The outer surface of described dielectrophoresis electrode arranges insulating barrier.
Described cross section is the polygon with sharp protrusion.
Described cross section is triangle, tetragon, triangle star or corner star.
A kind of dielectrophoresis electrod-array for separating medium endoparticle and droplet, it is characterised in that: it includes one group of dielectrophoresis electrode that more parallel rows is arranged；Centre-to-centre spacing or spacing between described dielectrophoresis electrode are uniformly distributed；The crest line of the dielectrophoresis electrode of adjacent lines and/or adjacent column is oppositely arranged, and relative two the dielectrophoresis electrodes of crest line connect an outfan and another outfan of alternating current power supply respectively；Described dielectrophoresis electrode is perpendicular to the flow direction of medium, or has acute angle with the flow direction of medium.
When the cross section of described dielectrophoresis electrode is triangle or triangle star, the electrode of lastrow is relative with the crest line of the dielectrophoresis electrode of next line.
It is a unit circulation with the dielectrophoresis electrode of line n～the n-th+3 row, on the dielectrophoresis electrode gap of line n arranges and is the most angular, the dielectrophoresis electrode position of the (n+1)th row is corresponding under between the adjacent two dielectrophoresis electrodes of line n and solely angular, the electrode position of the n-th+2 row corresponding to the (n+1)th row dielectrophoresis electrode and solely angular on, the dielectrophoresis electrode position of the n-th+3 row corresponding between the adjacent two dielectrophoresis electrodes of the n-th+2 row and the most angular under；It is connected on an outfan of alternating current power supply with the dielectrophoresis electrode in line n, is connected on another outfan of alternating current power supply with the dielectrophoresis electrode at the (n+1)th row.
When the cross section of described dielectrophoresis electrode is tetragon or corner star, the crest line with a line internal phase neighbour's dielectrophoresis electrode is relative, and the crest line with string internal phase neighbour's dielectrophoresis electrode is relative.
The odd number dielectrophoresis electrode of line n and the even number dielectrophoresis electrode of the (n+1)th row are connected on an outfan of alternating current power supply, and the even number dielectrophoresis electrode of line n and the odd number dielectrophoresis electrode of the (n+1)th row are connected on another outfan of alternating current power supply.
Phase 180 ° between one outfan and another outfan of described alternating current power supply.
Advantages of the present invention and having the beneficial effect that
1, the dielectrophoresis electrode of the present invention and electrod-array, the electrode of difference group can be connected to the two ends of alternating current power supply, dielectrophoresis effect can be formed in large scale scope, for being in or pass through the fluid of its electric field coverage scales, optionally the electric neutrality granule wherein contained is separated or is enriched with.Relative to traditional dielectric electrophoresis in the application of chip micro-nano rank yardstick, the wire electrode diameter that the present invention uses is at millimeter rank yardstick, and length is at the other yardstick of meter level, after electrode pair array, can cover cubic metre volume that rank yardstick is the biggest.
2, the dielectrophoresis electrode of the present invention and electrod-array, may be used for the rapid subsidence of field of environment engineering, the removal of suspended impurity in gas, and oil, crude oil go emulsifying to purify to be recycled.
Accompanying drawing explanation
Fig. 1 be cross section be the dielectrophoresis electrode of triangle；
Fig. 2 be cross section be the dielectrophoresis electrode of triangle star；
Fig. 3 be cross section be the dielectrophoresis electrode of tetragon；
Fig. 4 be cross section be the dielectrophoresis electrode of corner star；
Fig. 5 is the parallel arrangement schematic diagram of the electrod-array of the present invention；
Fig. 6 is the structural representation (cross section is tetragon) of the electrod-array of the present invention；
Fig. 7 is the structural representation (cross section is triangle) of the electrod-array of the present invention；
Fig. 8 is the structural representation (cross section is corner star) of the electrod-array of the present invention；
Fig. 9 is the structural representation (cross section is triangle star) of the electrod-array of the present invention；
Figure 10 is the floor map of the electrod-array that cross section is tetragon of the present invention；
Figure 11 is the floor map of the electrod-array that cross section is triangle of the present invention；
Figure 12 is that triangular-shaped electrodes connects electrical schematic；
Figure 13 is that triangle star electrode connects electrical schematic；
Figure 14 is that tetragon electrode connects electrical schematic；
Figure 15 is that corner star electrode connects electrical schematic；
Figure 16 is the scattergram (coefficient value, instantaneous) that square-shaped electrode array produces dielectrophoresis force；
Figure 17 is that corner star electrod-array produces dielectrophoresis force scattergram (coefficient value, instantaneous)；
Figure 18 is that triangular-shaped electrodes array produces dielectrophoresis force scattergram (coefficient value, instantaneous).
Description of reference numerals
2-cross section be the dielectrophoresis electrode of triangle, 3-cross section be the dielectrophoresis electrode of triangle star, 4-cross section be the dielectrophoresis electrode of tetragon, 5-cross section be the dielectrophoresis electrode of corner star, 7-triangle dielectrophoresis electrod-array, 8-triangle star dielectrophoresis electrod-array, 9-tetragon dielectrophoresis electrod-array, tetra-jiaos of star dielectrophoresis electrod-arrays of 10-.
Detailed description of the invention
Below by specific embodiment, the invention will be further described, and following example are illustrative, is not determinate, it is impossible to limit protection scope of the present invention with this.
The dielectrophoresis electrode of the present invention is that outer surface arranges insulating barrier, and this insulating barrier can be insulating coating or enamel shell at the shape longitudinally with consistent geometric profile.The cross section of dielectrophoresis electrode can be the polygon with sharp protrusion, the protruding crest line constituting dielectrophoresis electrode；The cross section of dielectrophoresis electrode 2 as shown in Figure 1 is triangle, the cross section of dielectrophoresis electrode 3 as shown in Figure 2 is triangle star, the cross section of dielectrophoresis electrode 4 as shown in Figure 3 is tetragon, and the cross section of dielectrophoresis electrode 5 as shown in Figure 4 is corner star.
As shown in Figure 5, a kind of dielectrophoresis electrod-array for separating medium endoparticle and droplet, it includes the dielectrophoresis electrode being parallel to each other and being arranged in array, and dielectrophoresis electrod-array is perpendicular to the flow direction of medium, or has acute angle with the flow direction of medium.Shape according to electrode sections is different, and arrangement mode slightly difference, centre-to-centre spacing or spacing between dielectrophoresis electrode and dielectrophoresis electrode about are uniformly distributed.Dielectrophoresis electrod-array can be the electrode of same cross sectional shape, can also arrange by different cross section shape blending, as long as ensureing the electrode crest lines of adjacent rows and/or adjacent two row relatively, wherein adjacent rows/or the adjacent two electrode preferred distance arranged or the shortest adjacent electrode of centre-to-centre spacing.The two dielectrophoresis electrodes that crest line is relative connect an outfan and another outfan, the phase 180 ° between an outfan and another outfan of alternating current power supply of alternating current power supply respectively.
As it is shown in fig. 7, the cross section of the dielectrophoresis electrode in dielectrophoresis electrod-array 7 is triangle；As it is shown in figure 9, the cross section of the dielectrophoresis electrode in dielectrophoresis electrod-array 8 is triangle star.When the cross section of dielectrophoresis electrode is triangle or triangle star, the electrode of lastrow is relative with the electrode crest line of next line.As shown in figure 11, being specially with line n～the n-th+3 row electrode is a unit circulation, it is spaced on the electrode of line n is solely angular, it is that only angle is down-set that the electrode position of the (n+1)th row corresponds between adjacent two electrodes of line n, the electrode position of the n-th+2 row is that only angle sets up corresponding to the electrode of the (n+1)th row, and the electrode position of the n-th+3 row is corresponding to being that only angle is down-set between adjacent two electrodes of the n-th+2 row, and wherein n is natural number, as n=0, only consider the situation of n+1 row；Above structure need to ensure that the electrode crest line of adjacent rows is relative, and from vertical electrode axis cross section, electrode group forms hexagonal array.As shown in Figure 12 and Figure 13, it is connected on an outfan of alternating current power supply with the electrode in odd-numbered line, is connected on another outfan of alternating current power supply with the electrode in even number line.
As shown in Figure 6, the cross section of the dielectrophoresis electrode in dielectrophoresis electrod-array 9 is tetragon；As shown in Figure 8, the cross section of the dielectrophoresis electrode in dielectrophoresis electrod-array 10 is corner star.When the cross section of dielectrophoresis is tetragon or corner star, the crest line with a line internal phase neighbour's electrode is relative, and the crest line with string internal phase neighbour's electrode is relative.As shown in Figure 14, Figure 15, the odd number dielectrophoresis electrode of line n and the even number dielectrophoresis electrode of the (n+1)th row are connected on an outfan of alternating current power supply, and the even number dielectrophoresis electrode of line n and the odd number dielectrophoresis electrode of the (n+1)th row are connected on another outfan of alternating current power supply.
The present invention for the operation principle of separating medium endoparticle and the dielectrophoresis electrod-array of droplet is:
As shown in Figure 12-Figure 15, all electrodes in dielectrophoresis electrod-array are divided into two groups, the same outfan of alternating current power supply is connected with the electrode in group, alternating current phases between two arrays of electrodes differs 180 °, and in figure, black and white electrode signifies the electrode needing to be connected on alternating current power supply difference outfan.As shown in Figure 16, Figure 17, Figure 18, when connecting alternating current power supply, forming non-uniform electric field between the crest line that electrode is relative, in dielectrophoresis electrod-array, the length direction along electrode produces bar shape dielectrophoresis force scope distribution form.
When the frequency difference of alternating current power supply input, produce positive dielectrophoresis effect or negative dielectrophoresis effect.Dust-contained airflow enters tetragon regions of electrode groups along being perpendicular to electrode axis direction, when through AC field coverage, the direction that particulate matter therein is acted on to electric field intensity is big by dielectrophoresis force is moved, it is gathered at electrode seamed edge, when dielectrophoresis force is more than Stokes power (particulate matter main stress in low velocity fluid is viscosity resistance), granule is captured in the field regime that electrode is formed.And when granule density is sufficiently large, the granule of surrounding them is condensed into larger particles due to collision and " chain " effect and settles down.Thus can isolate the granule in gas or fluid, and they are collected.
And different liquids shows different Characteristic of Electric Polarization Feature under the effect of electric field in emulsion, this difference can make the drop of suspension produce dielectrophoresis effect in non-uniform electric field and by same direction, i.e. the position to high electric field intensity is moved.During movement, owing to collision and high local fields intensity liquid film between droplet two-by-two will be the worse for wear, thus it is merged into bigger drop.Along with constantly moving and droplet coalescence, emulsification forms two different liquids phases by being destroyed and is separated.
Although disclosing embodiments of the invention and accompanying drawing for the purpose of illustration, but it will be appreciated by those skilled in the art that: without departing from the present invention and spirit and scope of the appended claims, various replacements, to change and modifications be all possible, therefore, the scope of the present invention is not limited to embodiment and accompanying drawing disclosure of that.
Claims (10)
1. one kind is used for separating medium endoparticle and the dielectrophoresis electrode of droplet, it is characterised in that: described dielectric
Iontophoretic electrode is shape, and the cross section of described shape is with protruding shape, and described protruding composition is described
The crest line of dielectrophoresis electrode.
A kind of dielectrophoresis electrode for separating medium endoparticle and droplet the most according to claim 1,
It is characterized in that: the outer surface of described dielectrophoresis electrode arranges insulating barrier.
A kind of dielectrophoresis electrode for separating medium endoparticle and droplet the most according to claim 1,
It is characterized in that: described cross section is the polygon with sharp protrusion.
4. according to a kind of dielectric electricity for separating medium endoparticle and droplet described in claim 1 or 2 or 3
Swimming electrode, it is characterised in that: described cross section is triangle, tetragon, triangle star or corner star.
5. one kind use dielectrophoresis electrode as described in one of claim 1-4 for separating medium endoparticle with
The dielectrophoresis electrod-array of droplet, it is characterised in that: it includes one group of dielectrophoresis electrode that more parallel rows is arranged,
Centre-to-centre spacing or spacing between described dielectrophoresis electrode are uniformly distributed；The dielectrophoresis electricity of adjacent lines and/or adjacent column
The crest line of pole is oppositely arranged, and relative two the dielectrophoresis electrodes of crest line connect an outfan of alternating current power supply respectively
With another outfan；Described dielectrophoresis electrode is perpendicular to the flow direction of medium, or has with the flow direction of medium
Acute angle.
A kind of dielectrophoresis electrode array for separating medium endoparticle and droplet the most according to claim 5
Row, it is characterised in that: when the cross section of described dielectrophoresis electrode is triangle or triangle star, the electrode of lastrow
Relative with the crest line of the dielectrophoresis electrode of next line.
A kind of dielectrophoresis electrode array for separating medium endoparticle and droplet the most according to claim 6
Row, it is characterised in that: it is the circulation of unit with the dielectrophoresis electrode of line n～the n-th+3 row, Jie of line n
On electricity iontophoretic electrode is spaced and is the most angular, the dielectrophoresis electrode position of the (n+1)th row is adjacent corresponding to line n
Under between two dielectrophoresis electrodes and solely angular, the electrode position of the n-th+2 row is corresponding to the dielectrophoresis electricity of the (n+1)th row
Pole and solely angular on, the dielectrophoresis electrode position of the n-th+3 row is corresponding to the adjacent two dielectrophoresis electrodes of the n-th+2 row
Between and solely angular under；It is connected on an outfan of alternating current power supply with the dielectrophoresis electrode in line n, with
The dielectrophoresis electrode of n+1 row is connected on another outfan of alternating current power supply.
A kind of dielectrophoresis electrode array for separating medium endoparticle and droplet the most according to claim 5
Row, it is characterised in that: when the cross section of described dielectrophoresis electrode is tetragon or corner star, with a line internal phase
The crest line of adjacent dielectrophoresis electrode is relative, and the crest line with string internal phase neighbour's dielectrophoresis electrode is relative.
A kind of dielectrophoresis electrode array for separating medium endoparticle and droplet the most according to claim 8
Row, it is characterised in that: the odd number dielectrophoresis electrode of line n and the even number dielectrophoresis electricity of the (n+1)th row
Pole is connected on an outfan of alternating current power supply, the even number dielectrophoresis electrode of line n and the of the (n+1)th row strange
Several dielectrophoresis electrodes are connected on another outfan of alternating current power supply.
10. according to the one described in claim 5 or 6 or 7 or 8 or 9 for separating medium endoparticle and droplet
Dielectrophoresis electrod-array, it is characterised in that: between an outfan and another outfan of described alternating current power supply
Phase 180 °.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738505A (en) * | 2019-01-07 | 2019-05-10 | 重庆大学 | Array Liquid Crystal Sensor based on dielectrophoresis |
| CN110127820A (en) * | 2019-05-24 | 2019-08-16 | 杭州拉谷科技有限公司 | A kind of array high voltage static electric water treeting device and its application |
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