CN206935332U - The microlayer model active preparation facilities of flow focusing jet disturbing type is driven based on liquid - Google Patents
The microlayer model active preparation facilities of flow focusing jet disturbing type is driven based on liquid Download PDFInfo
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- CN206935332U CN206935332U CN201720579371.9U CN201720579371U CN206935332U CN 206935332 U CN206935332 U CN 206935332U CN 201720579371 U CN201720579371 U CN 201720579371U CN 206935332 U CN206935332 U CN 206935332U
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- 239000007788 liquid Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000000523 sample Substances 0.000 claims abstract description 43
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims 2
- 238000010008 shearing Methods 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 17
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000011258 core-shell material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a kind of microlayer model active preparation facilities that flow focusing jet disturbing type is driven based on liquid, belong to microfluidic art, the device mainly drives probe to disturb unbroken jet column by the piezoelectric cantilever vibrated, and the probe is bonded near the free end of piezoelectric cantilever；The jet column is formed by driving flow focusing based on liquid, driving liquid flows through circular hole from driving liquid entrance, shearing force is mutually provided the microlayer model being passed through by needle tubing and forms stable taper, microlayer model phase and then forms jet column through circular hole, the liquid of receptacle, which passes through, exports outflow.When adding the disturbance of piezoelectric cantilever, piezoelectric cantilever vibration of beam drives probe interference jet post, and technical solutions of the utility model control the broken caused microlayer model size of jet column, generation frequency by controlling driving voltage, driving frequency or the drive waveforms of piezoelectric cantilever.
Description
Technical Field
The utility model relates to a micro-fluidic technology field especially relates to a little liquid drop initiative preparation facilities based on liquid drives mobile focus efflux disturbance.
Background
The formation of droplets is illustrative of the complexity of microfluidic processing. The relatively small forces associated with surface tension create a high degree of non-linearity in the droplet formation process and are exceptionally sensitive to external disturbances. The formation of droplets from a continuous liquid phase requires the introduction of energy that is converted to surface energy upon droplet formation. When the energy is only from the fluid pressure and no external energy is input, the passive control is performed; in contrast, in the droplet generation process, external energy input is active control. The classical structure of passive control is: t-type and flow-focusing type. Passive control of both structures is achieved primarily by varying flow or pressure. The biggest problems of passive control are: the response time is too long, typically a few seconds or even minutes. The longer response time is mainly limited by the relatively large fluid resistance. At preset flow rates and pressures, the only way to obtain a droplet of a specific size is to adjust the liquid properties and the shape of the channel. According to different types of external input energy, the active control generation of droplets is mainly divided into: thermal control, magnetic control, gas/liquid drive control, piezoelectric control, and the like. Since the piezoelectric drive has a fast response, which can reach 200 μ s in general, the research on the preparation of micro-droplets by piezoelectric active excitation is receiving more and more attention, and the introduction of the piezoelectric disturbance is mainly directed to the microfluidic chip at present, and the volume or frequency of the formation of the micro-droplets is controlled by introducing the vibration of the piezoelectric wafer, the piezoelectric bimorph or the piezoelectric stack on the inlet pipeline before the formation of the jet. Compared with the micro-droplet preparation of a micro-fluidic chip, the micro-droplet preparation utilizing liquid-driven flow focusing has many advantages, such as low cost, high encapsulation efficiency, high yield and the like. Micro-droplets generated by the two-dimensional plane microfluidic chip technology are often deformed by contacting with the cavity wall. At present, for flow focusing based on liquid drive, the size and the generation frequency of generated micro-droplets are usually changed by changing the flow, but the change amplitude is limited, the flow is too large and too small and is not easy to form a cone with stable stroke, the generated micro-droplets have poor size uniformity and are often accompanied with the occurrence of satellite droplets, so that the influence on external disturbance is small, and the problem of wettability is further improved.
SUMMERY OF THE UTILITY MODEL
Based on the problem that prior art exists, the utility model aims at providing a little liquid drop active preparation device based on liquid drives flowing focus efflux disturbance, prepares little liquid drop through active control.
The utility model aims at realizing through the following technical scheme:
the utility model discloses embodiment provides a little liquid drop initiative preparation facilities based on liquid drives flowing focus efflux disturbance, include:
a piezoelectric device and a probe; wherein,
the piezoelectric device is arranged above the jet column container, the probe is arranged on the piezoelectric device, the front end of the probe extends into the liquid of the jet column container and is positioned above the jet column in the jet column container, and the piezoelectric device can vibrate and drive the probe to vibrate and interfere with the unbroken jet column to form droplets.
By the foregoing the utility model provides a technical scheme can see out, the embodiment of the utility model provides a little liquid drop initiative preparation facilities based on flowing focus efflux disturbance of liquid drive, its beneficial effect is:
the disturbance process can be accurately controlled, and micro liquid drops with required size and generation frequency can be conveniently prepared through active control.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a micro-droplet active preparation device provided in an embodiment of the present invention;
fig. 2 is a schematic structural view of a disturbed jet needle tube of the present invention being a coaxial wrapping tube;
fig. 3 is a schematic structural diagram of a probe with a circular opening according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a piezoelectric device provided by an embodiment of the present invention, which adopts a piezoelectric simply supported beam;
in the figure: 1-jet column, 2-needle tube, 3-microdroplet phase inlet, 31-nuclear phase, 32-shell phase, 4-conical body, 5-driving liquid inlet, 6-round hole, 7-probe, 71-round opening, 8-piezoelectric cantilever beam, 9-outlet, 10-container body and 11-piezoelectric simple beam.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific contents of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the embodiment of the utility model provides a little liquid drop active preparation device based on liquid drives flowing focus efflux disturbance can active control preparation little liquid drop, include:
a piezoelectric device and a probe; wherein,
the piezoelectric device is arranged above the jet column container, the probe is arranged on the piezoelectric device, the front end of the probe extends into the liquid of the jet column container and is positioned above the jet column in the jet column container, and the piezoelectric device can vibrate and drive the probe to vibrate and interfere with the unbroken jet column to form droplets. In the container with the structure, the jet flow column is formed by flowing and focusing based on liquid drive, the driving liquid flows through the round hole from the driving liquid inlet, the shearing force is provided for the micro-droplet phase introduced from the needle tube to form a stable cone, the micro-droplet phase further passes through the round hole to form the jet flow column, and the liquid in the container flows out through the outlet.
Referring to fig. 1, in the above manufacturing apparatus, the piezoelectric device employs a piezoelectric cantilever beam with one end fixed and the other end being a free end, the rear end of the probe is connected to the free end of the piezoelectric cantilever beam, and the specific probe is adhered near the free end of the piezoelectric cantilever beam.
Referring to fig. 4, in the above preparation apparatus, the piezoelectric device adopts a piezoelectric simply supported beam with two fixed ends, and the rear end of the probe is connected to the middle of the piezoelectric simply supported beam, and may be specifically disposed at the midpoint of the piezoelectric simply supported beam.
In the above manufacturing apparatus, the probe is made of an insulating material;
or, the probe is made of insulating material, the front end of the probe is provided with a circular opening (see fig. 3) for the jet flow column to pass through, the jet flow column and the circular opening of the probe are concentric in the initial state of the probe with the structure, and the probe is driven to disturb the jet flow column when the piezoelectric device vibrates.
In the above preparation apparatus, the jet column container includes:
a container body, a driving liquid inlet arranged at the upper end of the container body;
a droplet phase inlet arranged on the container body below the driving liquid inlet, wherein a needle tube is arranged in the droplet phase inlet, an outlet at the front end of the needle tube corresponds to a round hole correspondingly arranged on the container body, and the needle tube can output liquid which is focused in the container body based on liquid drive flow to form a jet column;
and an outlet is correspondingly arranged on the container body behind the jet flow column.
In the preparation device, the needle tube is a single-cylinder tube body or a coaxial wrapping tube body;
the container body adopts a transparent shell.
An embodiment of the utility model provides a little liquid drop initiative preparation method based on liquid drives flowing focus efflux disturbance, adopts the utility model discloses an initiative preparation facilities, including following step:
the size and the generation frequency of micro liquid drops generated by the probe interfering the jet column crushing are controlled by controlling the driving voltage, the driving frequency or the driving waveform of a piezoelectric device of the active preparation device, the driving voltage is smaller than the breakdown voltage of the piezoelectric device, the driving frequency is the vibration frequency of the piezoelectric device and the probe in liquid, and the driving waveform is any one of sine wave, square wave or sawtooth wave.
In the method, the micro-droplet phase can be formed by a core phase and a shell phase, the core phase can also be of a multi-core structure, so that a jet column with a core-shell structure is formed, and micro-droplets with the core-shell structure are formed through the disturbance of a piezoelectric device;
the utility model discloses a preparation facilities drives the probe that is located directly over the efflux post by the piezoelectricity cantilever beam of vibration and disturbs unbroken efflux post and form the little liquid drop to the required even size of active control preparation, the little liquid drop of frequency is generated, the range of having avoided the change that control flow formed little liquid drop to exist in the past is limited, the too big and too little stable toper of stroke that all is difficult for of flow, response time is longer, usually for several seconds, and the little liquid drop size degree of consistency of generation is poor, often accompany the appearance scheduling problem of satellite liquid drop.
The embodiments of the present invention will be described in further detail below.
As shown in fig. 1, an embodiment of the present invention provides a micro-droplet active preparation apparatus based on liquid-driven flow focusing jet disturbance, in which a piezoelectric cantilever beam 8 serving as a piezoelectric device vibrates to drive a probe 7 to interfere with an unbroken jet column 1, the probe 7 on the piezoelectric cantilever beam 8 is located right above the jet column 1, and the probe 7 is bonded near the free end of the piezoelectric cantilever beam 8; the jet flow column 1 is formed by flowing and focusing based on liquid drive, driving liquid flows through the round hole 6 from the driving liquid inlet 5, shearing force is provided for the micro-droplet phase 3 introduced by the needle tube 2 to form a stable cone 4, the micro-droplet phase 3 further penetrates through the round hole 6 to form the jet flow column 1, and liquid in the container 10 flows out through the outlet 9.
Only the probe 7 is extended into the liquid, thereby not only solving the insulation problem of the piezoelectric cantilever beam 8, but also reducing the liquid resistance.
When the electric cantilever beam 8 is not pressurized to be disturbed, the jet flow column 1 is prolonged under the liquid environment and is broken due to surface tension, the size of the broken liquid drop can be controlled only according to the flow, the response time is long and is usually several seconds, and the generated micro-droplets are uneven in size and are often accompanied with the occurrence of satellite liquid drops; when the disturbance of pressurization electric cantilever beam 8, the vibration of piezoelectric cantilever beam 8 drives probe 7 and disturbs efflux post 1, the utility model discloses technical scheme controls the micro-droplet size, the generation frequency of the broken production of efflux post 1 through the drive voltage, the drive frequency or the drive waveform of control piezoelectric cantilever beam 8.
As shown in fig. 2, the needle tube 2 may also be two coaxial needle tubes, that is, the micro-droplet phase 3 may be formed by a core phase 31 and a shell phase 32, and the core phase 3-1 may also be a multi-core structure, so as to form a jet column having a core-shell structure, and form micro-droplets having a core-shell structure through disturbance of a piezoelectric cantilever.
As shown in fig. 3, the probe 7 may also have a circular opening 71, and in an initial state, the jet column 1 is concentric with the circular opening 71, and the piezoelectric cantilever 8 drives the probe 7 to disturb the jet column 1 when vibrating.
As shown in fig. 4, the piezoelectric cantilever 8 as a piezoelectric device can be replaced by a piezoelectric simple beam 11, and the probe 7 is bonded to the middle point of the piezoelectric simple beam 11, so that the up-and-down swing of the probe 7 is purer.
The utility model discloses to liquid drive mobile focusing device, introduce the energy of piezoelectricity vibration after the efflux post forms, can observe the disturbance process directly perceivedly clearly, prepare the micro-droplet of required size, generation frequency through active control.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A micro-droplet active preparation device based on liquid-driven flow focusing jet flow disturbance is characterized by comprising:
a piezoelectric device and a probe; wherein,
the piezoelectric device is arranged above the jet column container, the probe is arranged on the piezoelectric device, the front end of the probe extends into the liquid of the jet column container and is positioned above the jet column in the jet column container, and the piezoelectric device can vibrate and drive the probe to vibrate and interfere with the unbroken jet column to form droplets.
2. The active micro-droplet preparation device based on liquid-driven flowing focused jet disturbance according to claim 1, wherein the piezoelectric device adopts a piezoelectric cantilever with one end fixed and the other end being a free end, and the rear end of the probe is connected to the free end of the piezoelectric cantilever.
3. The active micro-droplet preparation device based on liquid-driven flowing focused jet disturbance according to claim 1, wherein the piezoelectric device is a piezoelectric simple beam with two fixed ends, and the rear end of the probe is connected to the middle part of the piezoelectric simple beam.
4. The active micro-droplet preparation device based on liquid-driven flow focused jet disturbance according to any one of claims 1 to 3,
the probe is made of an insulating material;
or the probe is made of an insulating material, and the front end of the probe is provided with a circular opening for the jet flow column to pass through.
5. The active micro-droplet preparation device based on liquid-driven flow focused jet disturbance according to any one of claims 1 to 3, wherein the jet column container comprises:
a container body, a plurality of sealing rings and a plurality of sealing rings,
a driving liquid inlet arranged at the upper end of the container body;
a droplet phase inlet arranged on the container body below the driving liquid inlet, wherein a needle tube is arranged in the droplet phase inlet, an outlet at the front end of the needle tube corresponds to a round hole correspondingly arranged on the container body, and the needle tube can output liquid which is focused in the container body based on liquid drive flow to form a jet column;
and an outlet is correspondingly arranged on the container body behind the jet flow column.
6. The active micro-droplet preparation device based on liquid-driven flowing focused jet disturbance according to claim 5, wherein the needle tube is a single-cylinder tube body or a coaxial tube body;
the container body adopts a transparent shell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720579371.9U CN206935332U (en) | 2017-05-23 | 2017-05-23 | The microlayer model active preparation facilities of flow focusing jet disturbing type is driven based on liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720579371.9U CN206935332U (en) | 2017-05-23 | 2017-05-23 | The microlayer model active preparation facilities of flow focusing jet disturbing type is driven based on liquid |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107029640A (en) * | 2017-05-23 | 2017-08-11 | 中国科学技术大学 | The microlayer model active preparation facilities and method of flow focusing jet disturbing type are driven based on liquid |
| CN112811385A (en) * | 2019-11-18 | 2021-05-18 | 上海海事大学 | Device for manufacturing micro-droplets in capillary and micro-droplet generation method |
| CN113070006A (en) * | 2021-04-12 | 2021-07-06 | 安徽农业大学 | Avermectin micro-droplet preparation device and method based on flow focusing technology |
| CN113907058A (en) * | 2021-09-08 | 2022-01-11 | 安徽农业大学 | Pesticide spraying device based on flow focusing and operation method thereof |
| CN114223938A (en) * | 2022-01-14 | 2022-03-25 | 中国科学技术大学先进技术研究院 | Preparation method of tobacco tar microcapsule |
-
2017
- 2017-05-23 CN CN201720579371.9U patent/CN206935332U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107029640A (en) * | 2017-05-23 | 2017-08-11 | 中国科学技术大学 | The microlayer model active preparation facilities and method of flow focusing jet disturbing type are driven based on liquid |
| CN107029640B (en) * | 2017-05-23 | 2023-04-21 | 中国科学技术大学 | Micro-droplet active preparation device and method based on liquid-driven flow focusing jet disturbance |
| CN112811385A (en) * | 2019-11-18 | 2021-05-18 | 上海海事大学 | Device for manufacturing micro-droplets in capillary and micro-droplet generation method |
| CN113070006A (en) * | 2021-04-12 | 2021-07-06 | 安徽农业大学 | Avermectin micro-droplet preparation device and method based on flow focusing technology |
| CN113907058A (en) * | 2021-09-08 | 2022-01-11 | 安徽农业大学 | Pesticide spraying device based on flow focusing and operation method thereof |
| CN113907058B (en) * | 2021-09-08 | 2022-12-13 | 安徽农业大学 | Pesticide spraying device based on flow focusing and operation method thereof |
| CN114223938A (en) * | 2022-01-14 | 2022-03-25 | 中国科学技术大学先进技术研究院 | Preparation method of tobacco tar microcapsule |
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