CN210934766U - Electroosmosis micro mixer based on alternating current - Google Patents
Electroosmosis micro mixer based on alternating current Download PDFInfo
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- CN210934766U CN210934766U CN201921486923.7U CN201921486923U CN210934766U CN 210934766 U CN210934766 U CN 210934766U CN 201921486923 U CN201921486923 U CN 201921486923U CN 210934766 U CN210934766 U CN 210934766U
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- 238000005370 electroosmosis Methods 0.000 title description 9
- 239000012530 fluid Substances 0.000 claims abstract description 24
- 230000005684 electric field Effects 0.000 claims abstract description 9
- 238000013461 design Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004113 cell culture Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009089 cytolysis Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002032 lab-on-a-chip Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses an electric osmosis micromixer based on alternating current, including first entry, the second entry, the micromixer unit, the dog, interface channel, right angle miniflow passageway, semicircle miniflow passageway, fluid outlet. The micro-mixing units all comprise a first electrode, a second electrode, a third electrode and a fourth electrode. The electrodes are arranged at different positions of the stop block, different alternating voltages are applied to generate an electric field with nonuniform space, the laminar flow state of the microfluid flow is broken by means of the electric field force, the convection action of the two microfluids is enhanced, and the mixing of the two microfluids is realized. The utility model has the advantages that: the electrode structure is simple in design; the whole microfluid mixer has a compact structure, and realizes high-efficiency and high-quality mixing of microfluid by using a short microchannel.
Description
Technical Field
The utility model relates to a microfluid mixer relates to an electric osmosis micromixer based on alternating current.
Background
The microfluidic chip is also called as a lab-on-a-chip, which integrates sample preparation, reaction, separation, detection, cell culture, lysis and other structural units related to the research fields of chemistry, biology and the like on a chip with a few square centimeters, and forms a network through microfluidic channels, so that fluid penetrates through the whole system to replace a conventional analysis platform with various functions in a chemical or biological laboratory. With the development of technology, the fields to which microfluidic chips have been related at present include biomedical, environmental monitoring, food safety, judicial identification and the like.
Mixing on a macro scale generally refers to unit operations in which two or more materials are dispersed within each other to some degree of homogeneity by means of mechanical or hydrodynamic forces; the micron-scale mixing is very different from the macro-fluid mixing because the convection effect of the micro-fluid is not obvious at the micron scale, and in this case, the mixing of the micro-fluid mainly depends on the diffusion effect between molecules, so that the micro-fluid mixing becomes difficult under certain experimental requirements.
The micro-fluid mixer can be divided into a passive micro-fluid mixer and an electroosmosis micro-mixer, the passive micro-fluid mixer utilizes the geometric shape or the fluid characteristic to generate the mixing effect, and the mixing does not depend on other external forces except the force (such as pressure, electroosmosis driving and the like) for driving the fluid to flow; the electroosmosis micro mixer realizes mixing by means of external forces such as magnetic force, electric field force, sound field and the like; the electroosmosis micromixer has good mixing effect, but is often complex in structure and high in cost.
Based on this, the utility model provides a miniflow channel structure is single, and electrode design is simple, and the electric osmosis micromixer that the mixed effect is obvious relies on the electric field force drive, realizes that two kinds of different concentration microfluids mix.
Disclosure of Invention
An object of the utility model is to provide a novel structure's electric osmosis micromixer based on alternating current for realize the microfluid high quality of two kinds of different concentrations, efficient mixture.
The technical scheme of the utility model is that: an electro-osmosis micromixer based on alternating current comprises a first inlet (1), a second inlet (2), a micromixer unit (3), a stop block (4), a connecting channel (5), a right-angle channel (10), a semi-arc channel (11) and a fluid outlet (12), wherein the micromixer unit (3) comprises a first electrode (6), a second electrode (7), a third electrode (8) and a fourth electrode (9).
The electroosmotic micromixer based on alternating current is characterized in that: electrodes are arranged at different positions of a stop block in the micro-mixing unit, different alternating voltages are applied to generate a spatially-nonuniform electric field in the micro-channel, the electric field generates driving force for the micro-fluid in the micro-channel, secondary flow of the micro-fluid is generated at different positions in the micro-channel, the laminar flow state of the micro-fluid is broken, the convection effect of the two micro-fluids is enhanced, and the high-efficiency and high-quality mixing of the two micro-fluids is realized.
The utility model has the advantages that: the first type of microfluid enters from a first inlet (1), the second type of microfluid enters from a second inlet (2), the two types of microfluid sequentially flow through a right-angle microfluidic channel and a semi-arc microfluidic channel, and are acted by electric field force generated by 12 electrodes in three micro-mixing units (3) during the period, and the mixed fluids flow out from an outlet of a microfluidic mixer. Compared with other electroosmosis micromixers, the design of the microfluidic channel is more optimized, the fluids can be mixed with higher efficiency, and the energy loss in the flowing process of the microfluid can be reduced; the whole device is simple in integral structure, convenient to process and low in cost. Compared with other passive microfluidic mixers, the microfluidic channel is shorter in length, and pressure loss of the microfluid in the process of flowing along the microfluidic channel is effectively reduced.
Drawings
Fig. 1 is a schematic diagram of a two-dimensional structure of an electro-osmotic micromixer based on alternating current, in which: 1. the micro-mixing device comprises a first inlet, 2, a second inlet, 3, a micro-mixing unit, 4, a stop block, 5, a connecting channel, 6, a first electrode, 7, a second electrode, 8, a third electrode, 9, a fourth electrode, 10, a right-angle channel, 11, a semi-circular channel and 12, and a fluid outlet.
Fig. 2 is a front view of a micro-mixing unit structure of an electro-osmotic micro-mixer based on an alternating current.
FIG. 3 is a schematic diagram of the fluid concentration of an electroosmotic micromixer based on alternating current, and it can be seen that the concentration at the first inlet is 1mol/m3The concentration at the second inlet is 2mol/m3The concentration at the fluid outlet is close to 1.5mol/m3。
Fig. 4 is a flow chart of the interior of an electroosmotic micromixer based on alternating current, which can enhance the convection action of two types of microfluid at each vortex to realize mixing.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
An electro-osmosis micromixer based on alternating current comprises a first inlet (1), a second inlet (2), a micromixer unit (3), a stop block (4), a connecting channel (5), a right-angle channel (10), a semi-arc channel (11) and a fluid outlet (12), wherein the micromixer unit (3) comprises a first electrode (6), a second electrode (7), a third electrode (8) and a fourth electrode (9).
Specifically, the first microfluid enters from a first inlet, the initial flow rate is 0.1mm/s, the second microfluid enters from a second inlet, and the initial flow rate is 0.1 mm/s; the density of the two microfluids is 1000kg/m3The dynamic viscosity is 0.001Pa ∙ s, the conductivity is 118mS/m, and the relative dielectric constant is 80.2.
Specifically, the first electrode (6) and the second electrode (7) are arranged on two right-angle sides of the block, the third electrode (8) and the fourth electrode (9) are arranged on a semicircular arc of the block, the first electrode (6) and the fourth electrode (9) apply the same alternating voltage, the voltage value is V0= sin (omega ∙ t), the second electrode (7) and the third electrode (8) apply the same alternating voltage, the voltage value is-V0 = -sin (omega ∙ t), and the angular frequency values are all omega =16 pi rad/s.
Specifically, the first microfluidic concentration value injected from the first inlet was set to 1mol/m3The concentration value of the second microfluid injected from the second inlet is set to 2mol/m3Post-mixing microfluid concentration theory from the outlet of a microfluid mixerThe value should be 1.5mol/m3。
Specifically, the wall surface of the microfluidic channel except the line segment where the electrode is located is set as an electrically insulating wall surface, and the electroosmotic velocity value of the wall surface is uniquely determined by the applied electric field.
Specifically, according to the requirement of experimental mixing precision, a plurality of micro-mixing units (3) can be connected in series, and two adjacent micro-mixing units are connected through a connecting channel (5) until the experimental mixing precision is reached.
Claims (5)
1. An electro-osmotic micromixer based on alternating current is characterized by comprising a first inlet (1), a second inlet (2), three micro-mixing units (3), a block (4), a connecting channel (5), a right-angle micro-flow channel (10), a semi-arc micro-flow channel (11) and a fluid outlet (12); wherein, the three micro-mixing units (3) all comprise a first electrode (6), a second electrode (7), a third electrode (8) and a fourth electrode (9).
2. The alternating current based electroosmotic micromixer according to claim 1, wherein a first type of microfluid enters from a first inlet (1) and a second type of microfluid enters from a second inlet (2), and the two types of microfluid flow through a right-angled microfluidic channel (10) and a semi-arc microfluidic channel (11) in sequence, and are subjected to the electric field force generated by 12 electrodes in three micromixer units (3) during the period, and are mixed and then flow out through an outlet (12).
3. An electro-osmotic micromixer based on alternating current according to claim 1, characterized in that a block (4) is added between the right-angle microfluidic channel (10) and the semicircular microfluidic channel (11), the upper half part of the block is semicircular, the lower half part of the block is right-angled triangular, and the first electrode (6), the second electrode (7), the third electrode (8) and the fourth electrode (9) are respectively arranged on the semicircular arc and the right-angled side of the triangular, and the positions of the electrodes are symmetrical in the vertical direction, wherein the first electrode (6) and the fourth electrode (9) apply the same alternating current voltage, and the second electrode (7) and the third electrode (8) apply the same alternating current voltage.
4. The alternating current based electro-osmotic micromixer according to claim 1, characterized in that the ratio of the width of the first inlet (1) to the second inlet (2) is 1: 1.
5. An electro-osmotic micromixer based on alternating current according to claim 1, characterized in that the extension of the side length on the outlet (12) crosses the right intersection of the right angular microfluidic channel (10) and the semicircular arc microfluidic channel (11), the ratio of the width to the width of the first inlet (1) being 1: 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921486923.7U CN210934766U (en) | 2019-09-09 | 2019-09-09 | Electroosmosis micro mixer based on alternating current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921486923.7U CN210934766U (en) | 2019-09-09 | 2019-09-09 | Electroosmosis micro mixer based on alternating current |
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| CN210934766U true CN210934766U (en) | 2020-07-07 |
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| CN201921486923.7U Expired - Fee Related CN210934766U (en) | 2019-09-09 | 2019-09-09 | Electroosmosis micro mixer based on alternating current |
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- 2019-09-09 CN CN201921486923.7U patent/CN210934766U/en not_active Expired - Fee Related
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Granted publication date: 20200707 |