CN100506685C - Method of driving micro-channel fluid utilizing magnetic droplet - Google Patents
Method of driving micro-channel fluid utilizing magnetic droplet Download PDFInfo
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- CN100506685C CN100506685C CNB200610165528XA CN200610165528A CN100506685C CN 100506685 C CN100506685 C CN 100506685C CN B200610165528X A CNB200610165528X A CN B200610165528XA CN 200610165528 A CN200610165528 A CN 200610165528A CN 100506685 C CN100506685 C CN 100506685C
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- 239000012530 fluid Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005291 magnetic effect Effects 0.000 title claims description 26
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 39
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000005459 micromachining Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 4
- 238000000018 DNA microarray Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005307 ferromagnetism Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a fluid driving method inside a micro channel, which sets magnetic fluid drop and driven fluid post inside the micro channel, with several micro current elements along the channel direction. It is driven by electromagnetic principle, free from mechanic movement component, with high reliability, easy for micro machining, with reduced cost, controlled logic simplicity, relatively wide selection scope with low cost of the basic fluid of the magnetic fluid, selecting proper magnetic fluid to drive various fluids.
Description
Technical field
The invention belongs to magnetic fluid, microelectromechanical systems and biochip technology field.Be particularly related to the magnetism characteristic that is had based on magnetic fluid, driving other immiscible fluid with the drop of magnetic fluid flows, this method utilizes the electromagnetic force principle to drive, there is not mechanical moving component, being easy to adopt micro fabrication to realize, is the method for driving microchannel fluid that utilizes magnetic droplet.
Background technology
Microelectromechanical systems and biochip are the hot issues of current research, wherein play an important role in the implementation procedure that is flowing in some systemic-function of fluid in microelectromechanical systems, but still lack at present can be easy the fluid driving method in the MEMS of being integrated into.Integrated driving device commonly used at present needs moving component, processing and integrating process complexity, and difficulty of processing is big and cost is high.
Magnetic fluid is a kind of comparatively new-type functional material, and it forms the stable colloid system by nano level ferromagnetism particulate highly dispersed among liquid, have magnetic and flowability simultaneously, is subjected to the attraction in magnetic field as ferromagnetic material.Magnetic fluid is widely used in fields such as dynamic seal (packing) and sensors.The present invention has utilized the magnetic and the flowability of magnetic fluid simultaneously, uses the conduct in the microchannel of magnetic fluid drop to drive.
Summary of the invention
The present invention is based on the magnetic and the flowability of magnetic fluid, a kind of method of utilizing magnetic droplet to drive the microchannel fluid is proposed, it is characterized in that, place in the microchannel 1 on matrix magnetic fluid drop 4 and with the magnetic fluid drop immiscible be driven fluid fluid column 5, magnetic fluid drop 4 places an end or the two ends that are driven fluid fluid column 5; In channel bottom or the little current elements of side arrangement series, first little current elements 2 and second little current elements 3 are any two the little current elements in serial little current elements along channel direction; Described little current elements is connected to external power source and is controlled by logic circuit.
Above-mentioned magnetic fluid drop is an operation material.Base fluid wherein can adopt dissimilar liquid, can drive flowing of the dissimilar fluid fluid columns immiscible with it respectively.The magnetic fluid drop is an end at the two ends that are driven the fluid fluid column or wherein, drives by the motion of magnetic fluid drop under the effect of magnetic field and is driven flowing of fluid fluid column.
Driving force of the present invention comes from magnetic field.Magnetization takes place and is attracted in magnetic fluid in magnetic field, the direction that the sensing magnetic field of gravitation increases.By the attraction that the magnetic fluid drop is subjected in magnetic field, can drive it and in the microchannel, move, and then drive by what it sealed and be driven flowing of fluid.
Magnetic field of the present invention is near little current elements of processing along channel direction channel wall or the wall.This will generate magnetic field after current elements energising slightly, and according to the position of magnetic fluid drop, current elements is according to the energising of certain orientation order slightly to this, and the magnetic field that it produced will drag the magnetic fluid liquid drop movement by corresponding direction.
The invention has the beneficial effects as follows that key of the present invention is the numerous little current elements along channel direction, they and magnetic fluid droplet interaction produce the power that drive fluid flows.Relative mechanical driving structure, the conductive structure of little current elements is easy in microelectromechanical systems integrated, can effectively reduce cost, and control logic is simple simultaneously; Driving method movement-less part of the present invention has high reliability.Though the magnetic fluid of a certain base fluid can only drive and its immiscible fluid that is driven, the base fluid of magnetic fluid has to be selected and with low cost more widely; Select suitable magnetic fluid, can drive various fluids.
Description of drawings
Fig. 1 is the schematic diagram of magnetic droplet method of driving microchannel fluid.
The specific embodiment
The present invention proposes a kind of magnetic droplet method of driving microchannel fluid.Below in conjunction with accompanying drawing specific implementation process of the present invention is further described.
The present invention is based on magnetic fluid and be subjected to the principle of magnetic field suction.Be the schematic diagram of magnetic droplet method of driving microchannel fluid as shown in Figure 1.Place magnetic fluid drop 4 in the microchannel 1 on matrix and be driven fluid fluid column 5, in channel bottom or the little current elements of side arrangement series, first little current elements 2 and first little current elements 3 are any two the little current elements in serial little current elements along channel direction.If wish that being driven fluid moves from left to right, and the magnetic fluid drop is just above first little current elements 2, at this moment second little current elements 3 on first little current elements, 2 right sides is switched on, to produce a magnetic field traction magnetic fluid drop 4 towards its motion by electromagnetic induction second little current elements 3, the magnetic fluid drop will promote to be driven the fluid fluid column simultaneously and move right, when treating the little current elements of magnetic fluid liquid drop movement to the second 3 tops, disconnect the electric current of second little current elements 3, simultaneously to its right side current elements energising, so circulation.If be driven the fluid fluid column two ends fluid drop that all is magnetic, then can produce two kinds of effects of push-and-pull respectively at two ends by the method for said sequence energising.If wish that being driven fluid moves from right to left, only needs by opposite switching in proper order.Above-mentioned magnetic fluid is commercially available prod (W of Anhui Jinke Magnetic Liquids Co., Ltd. series water-based magnetic fluid and the high heat conduction magnetic fluid of C series, network address http://www.jk-nano.com) this magnetic fluid is made up of ferromagnetism particulate, base fluid and surfactant etc.
Claims (2)
1. method of driving microchannel fluid that utilizes magnetic droplet, it is characterized in that, place in the microchannel on matrix (1) magnetic fluid drop (4) and with the magnetic fluid drop immiscible be driven fluid fluid column (5), magnetic fluid drop (4) places an end or the two ends that are driven the fluid fluid column; In channel bottom or the little current elements of side arrangement series, first little current elements (2) and second little current elements (3) are any two the little current elements in serial little current elements along channel direction; Described little current elements is connected to external power source and is controlled by logic circuit.
2. according to the described method of driving microchannel fluid that utilizes magnetic droplet of claim 1, it is characterized in that, the described little current elements that is connected to external power source, the power-up sequence of its logic circuit is that order energising from left to right then drives drive fluid fluid column (5) and moves from left to right from magnetic fluid drop (4) below current elements; Vice versa.
3. according to the described method of driving microchannel fluid that utilizes magnetic droplet of claim 1, it is characterized in that, described little current elements adopts unicoil or multi-thread circle, improves the driving force that this driving method can produce with electric current or the increase coil quantity that improves current elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610165528XA CN100506685C (en) | 2006-12-21 | 2006-12-21 | Method of driving micro-channel fluid utilizing magnetic droplet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610165528XA CN100506685C (en) | 2006-12-21 | 2006-12-21 | Method of driving micro-channel fluid utilizing magnetic droplet |
Publications (2)
| Publication Number | Publication Date |
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| CN101012051A CN101012051A (en) | 2007-08-08 |
| CN100506685C true CN100506685C (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200610165528XA Expired - Fee Related CN100506685C (en) | 2006-12-21 | 2006-12-21 | Method of driving micro-channel fluid utilizing magnetic droplet |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1970122A1 (en) * | 2007-03-12 | 2008-09-17 | Koninklijke Philips Electronics N.V. | Microfluidic system based on magnetic actuator elements |
| US8830016B2 (en) * | 2012-09-10 | 2014-09-09 | Broadcom Corporation | Liquid MEMS magnetic component |
| CN106990278B (en) * | 2015-03-18 | 2019-06-07 | 深圳供电局有限公司 | The high-tension circuit measurement method of current measuring instrument |
| CN105141106B (en) * | 2015-09-15 | 2018-01-16 | 清华大学 | A kind of motion workbench of Three Degree Of Freedom |
| CN105863985B (en) * | 2016-04-21 | 2018-02-27 | 北京航空航天大学 | Magnetic response compound interface driving liquid motion device and its preparation method and application |
| CN107159325B (en) * | 2017-04-24 | 2019-06-28 | 北京交通大学 | A kind of magnetic liquid entrainment trap |
| CN107091921B (en) * | 2017-04-24 | 2019-02-05 | 北京交通大学 | A kind of magnetic liquid experiment chip for bioassay |
| CN108745430B (en) * | 2018-07-11 | 2023-10-20 | 昆明理工大学 | Device and method for directionally conveying liquid drops by taking magnetic liquid drops as media |
| CN109631618A (en) * | 2018-11-06 | 2019-04-16 | 北京交通大学 | A kind of pumping heat-exchanger rig based on magnetic liquid drop |
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2006
- 2006-12-21 CN CNB200610165528XA patent/CN100506685C/en not_active Expired - Fee Related
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| CN101012051A (en) | 2007-08-08 |
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