CN111167530A - Device and method for optically controlling driving liquid drops based on p-n junction photoelectric effect - Google Patents
Device and method for optically controlling driving liquid drops based on p-n junction photoelectric effect Download PDFInfo
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- CN111167530A CN111167530A CN202010058857.4A CN202010058857A CN111167530A CN 111167530 A CN111167530 A CN 111167530A CN 202010058857 A CN202010058857 A CN 202010058857A CN 111167530 A CN111167530 A CN 111167530A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/50273—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by the means or forces applied to move the fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/0415—Moving fluids with specific forces or mechanical means specific forces electrical forces, e.g. electrokinetic
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Abstract
The invention discloses a device for controlling driving liquid drops based on p-n junction photoelectric effect light, which comprises a direct current power supply, an insulating substrate layer, a p-n junction structure layer arranged on the insulating substrate layer and a dielectric hydrophobic layer arranged on the p-n junction structure layer, wherein two ends of the p-n junction structure layer are connected with the direct current power supply, the p-n junction structure layer comprises a plurality of p-n junctions connected in series, and the p-n junctions are reversely connected in a circuit of the direct current power supply. The invention also discloses a method for optically controlling the driving liquid drop based on the p-n junction photoelectric effect. The invention utilizes the p-n junction structure layer to effectively improve the problem of photoresponse delay and the problem of contact angle hysteresis caused by the photoresponse delay, thereby greatly improving the driving effect of the device; in addition, the p-n junction is unidirectional in conduction, almost all the applied voltage of the device falls in a dark light area, the droplet driving force and the driving effect of the device under the same applied voltage are improved, the use of silicon oil is avoided, and the photoelectric wetting driving of the droplets in an air environment is really realized.
Description
Technical Field
The invention relates to the technical field of microfluidics, in particular to a device and a method for optically controlling a driving liquid drop based on a p-n junction photoelectric effect.
Background
Micro total analysis systems (μ -TAS) refers to a platform for performing sample processing, detection, and analysis on microchips with controlled flow of fluids throughout the system to replace various functions of conventional chemical or biological laboratories. This technology will greatly reduce the capital and time costs of each type of assay and greatly facilitate the development of point-of-care testing (POCT). The emphasis of μ -TAS is to achieve complete control of fluid or droplet behavior, including movement, separation, mixing, etc., on a microchip. Dielectric wetting (EWOD) is a very effective and widely used method for controlling discrete droplets, but it has some inevitable disadvantages, such as: wiring is difficult, peripheral control equipment is complex, and the like, so that the POCT system is difficult to adapt to the application scene of POCT.
In order to solve the technical bottleneck of the EWOD, researchers have proposed an opto-electro wetting (OEW) driving method, which solves the problems of difficult wiring, complex peripheral control equipment, and the like of the EWOD driving method. However, the conventional OEW driving method has a weak driving force, and thus, the driving of droplets can be realized only in silicone oil, and a practical target cannot be achieved.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides a device and a method for optically controlling a driving liquid drop based on a p-n junction photoelectric effect.
In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:
a device for controlling driving liquid drops based on p-n junction photoelectric effect light comprises a direct current power supply, an insulating substrate layer, a p-n junction structure layer arranged on the insulating substrate layer and a dielectric hydrophobic layer arranged on the p-n junction structure layer, wherein two ends of the p-n junction structure layer are connected with the direct current power supply, the p-n junction structure layer comprises a plurality of p-n junctions connected in series, and the p-n junctions are reversely connected in a circuit of the direct current power supply.
As a further improvement of the invention, the insulating substrate layer is glass or PET.
As a further improvement of the invention, metal electrodes are arranged at two ends of the p-n junction structure layer, and the two metal electrodes are connected with the direct current power supply.
As a further improvement of the invention, the metal electrode is made of aluminum, copper, gold or silver material.
As a further improvement of the invention, the working voltage of the direct current power supply is less than or equal to 30V.
A method for optically controlling a driving liquid drop based on a p-n junction photoelectric effect comprises the following steps of:
(1) placing the liquid drop at a first position, and allowing the upper surface of the device to receive uniform illumination with certain intensity to form a bright light area;
(2) setting the position where the liquid drop is to reach as a second position, so that the illumination intensity near the second position is weakened to form a dark light area;
(3) the liquid drop spreads to a dark light area;
(4) setting the direction from the first position to the second position as a target direction, and moving the dim light area to the same direction as the target direction;
(5) the liquid drop continuously spreads along with the dark light area to the direction same as the target direction, so that the liquid drop moves to the direction same as the target direction;
(6) the droplet moves from a first position to a second position.
As a further improvement of the invention, the droplet size is capable of contacting two adjacent p-n junctions simultaneously.
The invention has the beneficial effects that:
by adopting the p-n junction structure layer, the sensitivity of the p-n junction to light is obviously superior to that of a photoresistor made of a common single photosensitive material,typically, the response time of a p-n junction to light is 10-8s order of magnitude and the photoresistor has a response time of 10 to light-3s order of magnitude, so that the problem of optical response delay and the problem of contact angle hysteresis caused by the optical response delay can be effectively improved by utilizing the p-n junction structure layer, and the driving effect of the device is greatly improved; in addition, the p-n junction is in one-way conduction, when the p-n junction is reversely connected in the direct current circuit, the p-n junction is in a reverse cut-off state, when certain light irradiates the p-n junction reversely connected in the direct current circuit, the p-n junction jumps to a conducting state and outputs a tiny reverse voltage, so that the applied voltage of the device almost completely falls in a dark light area, the liquid drop driving force and the driving effect of the device under the same applied voltage are improved, the use of silicon oil is avoided, and the photoelectric wetting driving of the liquid drops in the air environment is really realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;
FIG. 2 is a simplified electrical schematic diagram of a preferred embodiment of the present invention;
fig. 3 is a diagram illustrating the operation of the droplet driving according to the preferred embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the device for controlling the driving liquid drop based on the p-n junction photoelectric effect comprises a direct current power supply 1, an insulating substrate layer 2, a p-n junction structure layer arranged on the insulating substrate layer 2 and a dielectric hydrophobic layer 3 arranged on the p-n junction structure layer, wherein two ends of the p-n junction structure layer are connected with the direct current power supply 1, the p-n junction structure layer comprises a plurality of p-n junctions 4 connected in series, and the p-n junctions 4 are reversely connected in a circuit of the direct current power supply 1.
The insulating substrate layer 2 is preferably glass, but is not limited to glass, and may also be PET (polyethylene terephthalate) or other flexible insulating material.
In order to facilitate the connection of the p-n junction structure layer and the direct current power supply 1, the two ends of the p-n junction structure layer are preferably provided with the metal electrodes 5, and the two metal electrodes 5 are connected with the direct current power supply 1. The adjacent p-n junctions 4 are connected through metal electrodes 5.
In the present invention, the metal electrode 5 is preferably aluminum, but is not limited to aluminum, and may be copper, gold, or silver.
The invention preferably selects the working voltage of the direct current power supply 1 to be less than or equal to 30V, and ensures the stable operation of the device.
Fig. 2 is a simplified circuit schematic of the present invention. In FIG. 2, PD1-PD4 are all p-n junctions 4 in the device, equivalent to photodiodes, C1-C3 are equivalent capacitances of the dielectric hydrophobic layer 3, and R isW1 and R W2 is the equivalent resistance of the droplet 6 on the corresponding dielectric hydrophobic layer 3 covering the PD2, PD3 area, and R is the safety resistance. When the PD1-PD4 are illuminated, a bright light area 7 is formed, so that each reverse connection photodiode works in a conducting state, namely the potential difference between two ends of each reverse connection photodiode is the same, the voltage drop of the corresponding dielectric hydrophobic layer 3 on two sides of the liquid drop 6 is the same, and the solid-liquid contact angles on two sides of the liquid drop 6 are the same according to a Young-Lippmann equation; when the illumination conditions of the PD1, the PD2 and the PD4 are not changed, the working state is also not changed, the illumination of the PD3 is weakened to form a dark light region 8, so that the working state of the PD3 is changed into a reverse cut-off state, and the voltage of the applied direct current power supply 1 almost completely falls on the PD3, namely, the potential difference between two sides of the PD3 is the largest, so that the voltage drop on the C3 is the largest and is far larger than that on the C1C2, the voltage of the applied dc power supply 1 is fully utilized, and according to the Young-Lippmann equation, the contact angle of the droplet 6 on the PD3 side is smaller than that on the PD2 side, and the droplet spreads toward the PD3 side. When the dark light region 8 moves in the PD2 to PD3 directions, the liquid droplet 6 moves as the dark light region 8 moves.
In this embodiment, the bright region 7 refers to a region where the light intensity and wavelength range enable the p-n junction 4 to maintain a reverse conduction state, the dark region 8 refers to a region where the light intensity and wavelength range enable the p-n junction 4 to maintain a reverse cut-off state, and the light intensity and wavelength range are related to the photoelectric characteristics and processing technology of the specific material forming the p-n junction 4. When the p-n junction 4 is made of crystalline silicon materials, the effective light wavelength range of the p-n junction is in a near infrared region and is insensitive to fluorescent lamps in a daily room, the bright light region 7 can be an infrared light irradiation region, the dark light region 8 can be a non-infrared light irradiation region, and a general commercially available infrared demonstration pen can meet the illumination intensity requirement; when the p-n junction 4 is made of amorphous silicon, metal compound or organic material, etc., it is sensitive to visible light, and the fluorescent lamp in the daily room can be conducted in the reverse direction, so the bright area 7 can be an outdoor or indoor lighting area in the daytime, and the dark area 8 can be an area covered with a light shielding plate (such as a black opaque plastic sheet).
A method for optically controlling a driving liquid drop based on a p-n junction photoelectric effect comprises the following steps of:
(1) placing the liquid drop 6 at a first position A, and receiving uniform illumination with certain intensity on the upper surface of the device to form a bright light area 7; preferably, the droplet size is such as to contact two adjacent p-n junctions 4 simultaneously;
(2) setting the position where the liquid drop 6 is to reach as a second position B, so that the illumination intensity near the second position B is weakened to form a dark light area 8;
(3) the liquid drop 6 spreads to the dark light area 8;
(4) setting the direction from the first position a to the second position B as a target direction, and moving the dark light area 8 in the same direction as the target direction;
(5) the liquid drop 6 continuously spreads along with the dark light area 8 to the same direction as the target direction, so that the liquid drop 6 moves to the same direction as the target direction;
(6) the droplet 6 moves from the first position a to the second position B.
As shown in fig. 3, to further illustrate the method of the present invention, it preferably comprises the following steps:
(1) placing the liquid drop 6 at a first position A, wherein the upper surface of the device receives uniform illumination with certain intensity, so that each p-n junction 4 is conducted, because the surface of the device is coated with the dielectric hydrophobic layer 3, the liquid drop 6 is approximately spherical, and the size of the liquid drop 6 is required to be capable of simultaneously contacting two adjacent p-n junctions 4, as shown in fig. 3 (a);
(2) the illumination intensity near a second position B on the right side of the first position A is weakened, as shown in fig. 3(B), so that the p-n junctions 4 in the corresponding area are rapidly jumped to a cut-off state, the voltage of the applied direct current power supply 1 is concentrated on the p-n junctions 4, and the voltage drop of the dielectric hydrophobic layer 3 covered on one side of the corresponding liquid drop 6 is increased and is far larger than that of the dielectric hydrophobic layer 3 covered on the other side;
(3) the droplet 6 spreads towards the dim zone 8, as shown in fig. 3 (c);
(4) the dark light region 8 moves rightward as shown in fig. 3 (d);
(5) the droplet 6 continues to spread rightward with the dark region 8, causing the droplet 6 to move rightward, as shown in fig. 3 (e);
(6) the droplet 6 moves from the first position a to the second position B as shown in fig. 3 (f).
According to the invention, by utilizing the photoelectric effect of the p-n junction, namely the characteristic that the conductivity of the p-n junction is enhanced after the p-n junction receives illumination, a larger potential difference is generated between a bright area and a dark area, when a liquid drop on the dielectric hydrophobic layer is positioned between the bright area and the dark area, the voltage drop of the liquid drop positioned on one side of the dark area and corresponding to the dielectric hydrophobic layer is larger than the voltage drop of the liquid drop positioned on one side of the bright area and corresponding to the dielectric hydrophobic layer, according to a Young-Lippmann equation, the contact angle of the liquid drop positioned on one side of the dark. The change in the conductivity of the p-n junction after illumination is an on-off change and is in the form of a jump. Meanwhile, the applied voltage can almost fall on the p-n junction of the dark light area due to the small light and shade difference, so that compared with the traditional OEW device, the potential difference between the light area and the dark area can be enlarged by using the p-n junction under the condition of the same applied voltage and the light and shade difference, and the driving force and the driving effect on liquid drops are greatly improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The device for controlling the driving liquid drop based on the p-n junction photoelectric effect is characterized by comprising a direct current power supply, an insulating substrate layer, a p-n junction structure layer arranged on the insulating substrate layer and a dielectric hydrophobic layer arranged on the p-n junction structure layer, wherein two ends of the p-n junction structure layer are connected with the direct current power supply, the p-n junction structure layer comprises a plurality of p-n junctions connected in series, and the p-n junctions are reversely connected in a circuit of the direct current power supply.
2. A device for optically controlling driving liquid drop based on p-n junction photoelectric effect as claimed in claim 1, wherein said insulating substrate layer is glass or PET.
3. A device for controlling the driving of liquid drop based on the photoelectric effect of p-n junction as claimed in claim 1, wherein both ends of the p-n junction structure layer are provided with metal electrodes, and both metal electrodes are connected to the dc power supply.
4. A device for optically controlling driving liquid drop based on p-n junction photoelectric effect as claimed in claim 3, wherein said metal electrode is made of aluminum, copper, gold or silver material.
5. A device for controlling the driving of liquid drops based on the photoelectric effect of p-n junction as claimed in claim 1, wherein the operating voltage of the DC power supply is less than or equal to 30V.
6. A method for optically controlling a driving liquid droplet based on a p-n junction photoelectric effect, characterized by using the device of any one of claims 1 to 5, comprising the steps of:
(1) placing the liquid drop at a first position, and allowing the upper surface of the device to receive uniform illumination with certain intensity to form a bright light area;
(2) setting the position where the liquid drop is to reach as a second position, so that the illumination intensity near the second position is weakened to form a dark light area;
(3) the liquid drop spreads to a dark light area;
(4) setting the direction from the first position to the second position as a target direction, and moving the dim light area to the same direction as the target direction;
(5) the liquid drop continuously spreads along with the dark light area to the direction same as the target direction, so that the liquid drop moves to the direction same as the target direction;
(6) the droplet moves from a first position to a second position.
7. A method for optically controlling driving of a droplet based on the photoelectric effect of a p-n junction according to claim 6, wherein the droplet size is capable of contacting two adjacent p-n junctions simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010058857.4A CN111167530A (en) | 2020-01-19 | 2020-01-19 | Device and method for optically controlling driving liquid drops based on p-n junction photoelectric effect |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010058857.4A CN111167530A (en) | 2020-01-19 | 2020-01-19 | Device and method for optically controlling driving liquid drops based on p-n junction photoelectric effect |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108514901A (en) * | 2018-06-01 | 2018-09-11 | 东莞东阳光科研发有限公司 | A kind of digital microcurrent-controlled chip |
| CN108620143A (en) * | 2018-06-28 | 2018-10-09 | 京东方科技集团股份有限公司 | Digital microcurrent-controlled chip and its driving method |
| CN108816299A (en) * | 2018-04-20 | 2018-11-16 | 京东方科技集团股份有限公司 | Micro-fluidic substrate and its driving method, micro-total analysis system |
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2020
- 2020-01-19 CN CN202010058857.4A patent/CN111167530A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108816299A (en) * | 2018-04-20 | 2018-11-16 | 京东方科技集团股份有限公司 | Micro-fluidic substrate and its driving method, micro-total analysis system |
| CN108514901A (en) * | 2018-06-01 | 2018-09-11 | 东莞东阳光科研发有限公司 | A kind of digital microcurrent-controlled chip |
| CN108620143A (en) * | 2018-06-28 | 2018-10-09 | 京东方科技集团股份有限公司 | Digital microcurrent-controlled chip and its driving method |
Non-Patent Citations (2)
| Title |
|---|
| DAMIEN BAIGL: "Photo-actuation of liquids for light-driven microfluidics: state of the art and perspectives", 《LAB CHIP》 * |
| YAQING LI等: "A New OEW Microfluidic Device based on p-n Junction", 《INTERNATIONAL CONFERENCE ON ROBOTICS AND BIOMIMETICS》 * |
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Application publication date: 20200519 |