WO2022213478A1

WO2022213478A1 - Electroosmotic pump system and manufacturing method for functional electrode thereof, and fluid conveying method

Info

Publication number: WO2022213478A1
Application number: PCT/CN2021/099689
Authority: WO
Inventors: 李良; 杨倩; 高猛; 叶乐
Original assignee: 杭州未名信科科技有限公司; 浙江省北大信息技术高等研究院
Priority date: 2021-04-08
Filing date: 2021-06-11
Publication date: 2022-10-13
Also published as: CN113300568A; CN113300568B

Abstract

An electroosmotic pump system and a manufacturing method for a functional electrode (111) thereof, and a fluid conveying method, the electroosmotic pump system comprising a liquid storage tank (150), an electro-osmosis driving module (110), a fluid pipeline (120), a plurality of valves, a power supply (130) and a control module (140); the electro-osmosis driving module (110) comprises a functional electrode (111) having reversible oxidation-reduction activity; the fluid pipeline (120) comprises two three-way pipelines (121) that communicate with one another, and the electro-osmosis driving module (110) is disposed at the position at which the two three-way pipelines (121) communicate; each three-way pipeline(121) communicates with the liquid storage pool (150) and the outside; the plurality of valves are opened or closed to form a fluid channel for target liquid to flow to the outside after flowing through the electro-osmosis driving module (110) from the liquid storage pool (150); and the flow directions of the target liquid flowing through the electro-osmosis driving module (110) in a first fluid passage and a second fluid passage are opposite one another.

Description

Electroosmotic pump system and method for making its functional electrode, and method for delivering fluid

technical field

The invention belongs to the technical field of fluid transportation, and in particular relates to an electroosmotic pump system and a method for manufacturing a functional electrode thereof, and a fluid transportation method.

Background technique

The electroosmotic pump is a device that utilizes electroosmosis for fluid transmission. It has the advantages of simple structure, no mechanical friction, less self-heating, and easy integration and assembly. The electroosmotic pump usually includes a porous medium and electrodes arranged on both sides of the porous medium. When the electroosmotic pump works, a certain voltage needs to be applied to the electrodes on both sides, and the flow rate of the fluid is controlled by controlling the magnitude of the applied voltage.

However, when a voltage is applied, a Faradaic reaction usually occurs on the electrode, that is, when water or an aqueous solution is used as the working fluid, the water will be electrolyzed to produce H2, O2, H+, OH-, etc. The bubbles formed by H2 and O2 will be adsorbed on the surface of the electrode or porous medium, affecting the stability of the electroosmotic pump and even making it stop working. (such as protein drugs).

In the prior art, materials with redox activity are usually modified on electrodes, or materials with redox activity are used to prepare electrodes, so as to avoid water electrolysis to a certain extent. However, this electrode is a consumable electrode. When the redox activity on the electrode is exhausted, its function is also lost. Therefore, the life of this electrode is short, and the electroosmotic pump cannot work stably for a long time. To sum up, the existing electroosmotic pumps are prone to electrolyzed water and bubbles adsorbing electrodes or porous media, so they cannot work stably for a long time.

SUMMARY OF THE INVENTION

The purpose of the present invention is to at least solve the problem that the existing electroosmotic pump cannot work stably for a long time due to the functional electrode electrolysis of water. This purpose is achieved through the following technical solutions:

A first aspect of the present invention provides an electroosmotic pump system, including:

a liquid storage tank, the liquid storage tank contains the target liquid;

an electroosmotic drive module, the electroosmotic drive module includes a porous medium and two functional electrodes arranged on both sides of the porous medium, and the functional electrodes have reversible redox activity;

A fluid pipeline, the fluid pipeline includes two connected three-way pipelines, the electroosmotic drive module is arranged at the connection between the two three-way pipelines, and each of the three-way pipelines is connected separately the liquid reservoir and the outside;

A plurality of valves, the plurality of valves are arranged on the fluid pipeline, and the plurality of valves are opened or closed to form a flow for the target liquid to flow from the liquid reservoir through the electroosmotic drive module to the The external first fluid passage and the second fluid passage, the flow direction of the target liquid flowing through the electroosmotic drive module in the first fluid passage is the same as the flow direction of the target liquid flowing through the electroosmotic drive module in the second fluid passage The flow direction of the electroosmotic drive module is opposite;

a power source, the power source is electrically connected to the functional electrode;

a control module for controlling the power supply and the plurality of valves.

In the electroosmotic pump system according to the present invention, by setting the functional electrode as a functional electrode with reversible redox activity, and forming a plurality of fluid passages between the liquid storage tank, the electroosmotic drive module, the fluid pipeline and the outside world, the Therefore, on the basis of being able to maintain the flow direction of the target liquid flowing through the functional electrode by changing the fluid passage, the direction of the voltage or current applied to the functional electrode can be changed by changing the polarity of the power supply, so that the functional electrode can be in different directions. The reversible reaction consumption is carried out at the same voltage or current, that is to say, the functional electrode can be changed to electrochemical reduction after a period of electrochemical oxidation, and then changed to electrochemical reduction after a period of electrochemical reduction. The electrochemical oxidation reaction is repeated, so that the functional electrode can repair its redox activity, so that it has a longer redox activity life, reducing or avoiding the electrolysis of water and the generation of bubbles in the working process of the functional electrode. The electroosmotic pump can work stably for a long time, which solves the problem that the existing electroosmotic pump cannot work stably for a long time due to the electrolysis of water by functional electrodes; The fluid passage and the second fluid passage do not interfere with each other. Whether it flows out from the first fluid passage or from the second fluid passage, the target liquid can flow out stably, and no backflow occurs, which improves the work of the electroosmotic pump system. The stability of the pump improves its pumping efficiency and energy utilization.

In addition, the electroosmotic pump system according to the present invention may also have the following additional technical features:

In some embodiments of the present invention, the three-way pipeline is provided with a connection port, a liquid inlet and a liquid outlet, the connection port communicates with the electroosmotic drive module, and the liquid inlet communicates with the liquid storage tank , the liquid outlet communicates with the outside world. In some embodiments of the present invention, the electroosmotic driving module further includes a casing and an electrode pad, the porous medium, the functional electrode and the electrode pad are respectively disposed in the casing, the electrode pad A groove is provided on the sheet, and the groove is used for accommodating the functional electrode, and an opening is also provided on the electrode pad, and the opening is used for the wire of the functional electrode to pass through, and the wire is connected with the functional electrode. the power supply connection.

In some embodiments of the present invention, the plurality of valves include one or more of solenoid valves, one-way valves, and ball valves.

In some embodiments of the present invention, the functional electrode includes an electrode layer and a conductive polymer layer disposed on the electrode layer. A second aspect of the present invention provides a method for making a functional electrode of an electroosmotic pump system, which is used to make the functional electrode in the electroosmotic pump system as described above, including:

A conductive polymer layer is provided on the electrode layer of the functional electrode by electrochemical deposition, dip coating or drop coating. In some embodiments of the present invention, the electrochemical deposition method comprises:

The porous conductive layer is used as the electrode layer, and the mixed solution of the monomer and acid of the conductive polymer and its derivatives is used as the electrolyte solution. the conductive polymer layer.

In some embodiments of the present invention, the dip coating method includes: dipping the electrode layer in the mixed dispersion liquid of the conductive polymer and its derivatives and an acid and then drying it to form the functional electrode.

In some embodiments of the present invention, the dip coating method includes: applying the mixed dispersion of the conductive polymer and its derivatives and an acid to the electrode layer and then drying it to form the functional electrode.

A third aspect of the present invention provides a fluid delivery method, the fluid delivery method is implemented using the electroosmotic pump system as described above, and the fluid delivery method includes:

The power supply is controlled to apply a voltage to the electroosmotic drive module, so that the functional electrodes of the electroosmotic drive module are respectively subjected to electrochemical reduction reaction and electrochemical oxidation reaction, and at the same time, the target liquid is controlled to flow from the liquid reservoir along the first fluid passage through the electro-osmotic drive module. After infiltrating the drive module, it flows to the outside world;

After a set time, the polarity of the power source is controlled to change, so that the functional electrode that performs electrochemical reduction reaction is changed to perform electrochemical oxidation reaction, and the functional electrode that performs electrochemical oxidation reaction is changed to perform electrochemical reduction reaction. Controlling the flow of the target liquid from the liquid storage tank through the electroosmotic driving module along the second fluid path to the outside, and the flow of the target liquid flowing through the electroosmotic driving module in the second fluid path The direction is opposite to the direction of flow of the target liquid through the electroosmotic drive module in the first fluid pathway.

According to the fluid delivery method proposed in the embodiment of the present invention, no matter how the direction of the voltage/current applied by the control module to control the power supply to the functional electrode changes, the target liquid can be pumped out of the liquid storage tank, which not only solves the problem of electroosmotic pump electrolysis The problems of water, bubble generation, and inability to work stably for a long time also improve the pumping efficiency and energy utilization of the electroosmotic pump system, thereby improving the stability of fluid delivery.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

FIG. 1 schematically shows a schematic structural diagram of an electroosmotic pump system according to Embodiment 1 of the present invention;

Fig. 2a schematically shows a schematic structural diagram of an electroosmotic drive module in an electroosmotic pump system according to Embodiment 1 of the present invention;

Fig. 2b schematically shows an exploded schematic diagram of the electroosmotic drive module in the electroosmotic pump system according to the first embodiment of the present invention;

FIG. 3 schematically shows a schematic structural diagram of the one-way valve fluid pipeline in the electroosmotic pump system according to the first embodiment of the present invention;

FIG. 4 schematically shows a schematic structural diagram of an electroosmotic pump system according to Embodiment 2 of the present invention;

Fig. 5a schematically shows a schematic three-dimensional structure diagram of the solenoid valve fluid pipeline in the electroosmotic pump system according to the second embodiment of the present invention;

Figure 5b schematically shows the left side view of Figure 5a;

Figure 5c schematically shows a cross-sectional view in the direction A-A in Figure 5b;

FIG. 6 schematically shows a schematic structural diagram of an electroosmotic pump system according to Embodiment 3 of the present invention;

Fig. 7a schematically shows a three-dimensional schematic diagram of the fluid pipeline of the ball valve in the electroosmotic pump system according to the second embodiment of the present invention;

Figure 7b schematically shows the front view of Figure 7a;

Figure 7c schematically shows a cross-sectional view in the direction A-A in Figure 7b;

FIG. 8 schematically shows the working schematic diagram of opening the fluid passage 1 in the electroosmotic pump system according to the first embodiment of the present invention;

FIG. 9 schematically shows a working schematic diagram of opening the fluid passage 2 in the electroosmotic pump system according to the first embodiment of the present invention.

110: Electroosmotic drive module; 120: One-way valve fluid line; 130: Power supply; 140: Control module; 150: Liquid reservoir;

111: functional electrode; 112: electrode gasket; 113: porous medium; 114: upper casing; 115: lower casing; 116: fluid pipeline connection port;

1111: wire; 1121: opening; 1122: groove;

1141: upper shell opening; 1142: lead wire; 1143: upper shell interface;

1151: card slot; 1152: lower shell interface;

120, fluid pipeline; 121: three-way pipeline; 122: first one-way valve; 123: second one-way valve; 124: third one-way valve; 125: fourth one-way valve; 1211: first electric valve osmotic drive module connection port; 1212: first liquid inlet; 1213: first liquid outlet; 151: connecting line;

220: solenoid valve fluid pipeline; 221: second electroosmotic drive module connection port; 222: second liquid inlet; 223: second liquid outlet; 224: first solenoid valve structure; 225: second solenoid valve structure;

320: Ball valve fluid line; 321: Ball valve.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" can also be intended to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated features, steps, operations, elements and/or components, but do not preclude the presence or addition of one or Various other features, steps, operations, elements, components, and/or combinations thereof. Method steps, procedures, and operations described herein are not to be construed as requiring that they be performed in the particular order described or illustrated, unless an order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be restricted by these terms. These terms may only be used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of example embodiments.

For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures, such as "inner", "outer", "inner" ", "outside", "below", "below", "above", "above", etc. This spatially relative term is intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "above the other elements or features" above features". Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in FIGS. 1 to 3 , the electroosmotic pump system in this embodiment includes a liquid storage tank 150 , an electroosmotic driving module 110 , a fluid pipeline 120 , a plurality of valves, a power supply 130 and a control module 140 , wherein the liquid storage The cell 150 contains the target liquid; the electroosmotic drive module 110 includes a porous medium 113 and two functional electrodes 111 arranged on both sides of the porous medium 113, and the functional electrodes 111 have reversible redox activity; the fluid pipeline 120 includes two connected The three-way pipeline 121, the electroosmotic drive module 110 is arranged at the connection of the two three-way pipelines, and each three-way pipeline 121 is respectively connected to the liquid storage tank 150 and the outside world; a plurality of valves are arranged on the fluid pipeline 120. , a plurality of valves are opened or closed to form a first fluid passage and a second fluid passage for the target liquid to flow from the liquid reservoir 150 through the electroosmotic drive module 110 to the outside, and the target liquid flows through the electroosmotic fluid passage in the first fluid passage. The flow direction of the osmotic drive module 110 is opposite to the flow direction of the target liquid flowing through the electroosmotic drive module 110 in the second fluid path; the power source 130 is electrically connected to the functional electrode 111; the control module 140 is used to control the power source 130 and a plurality of valves. The electroosmotic pump system proposed in the embodiment of the present invention is used for pumping the target liquid stored in the liquid storage tank 150 to the outside world. Specifically, the electroosmotic driving module 110 further includes a casing, and the porous medium 113 and the functional electrode 111 are used as drivers. The components can be arranged in the housing, and the fluid pipeline 120 is communicated with the reservoir 150 and the housing of the electroosmotic drive module 110 respectively, so that the target liquid flowing through the fluid pipeline 120 can flow through the porous medium 113 and the functional electrode 111 in the housing. , so as to control the flow rate of the target liquid by controlling the magnitude of the voltage on the functional electrode 111 , and make the target liquid flow out from one of the three-way pipes 121 in the fluid pipeline 120 to the outside after flowing through the electroosmotic drive module 110 .

The electroosmotic pump system proposed in the embodiment of the present invention sets the functional electrode 111 as a functional electrode 111 with reversible redox activity, and forms a first sec- ond A fluid passage and a second fluid passage, and the flow direction of the target liquid flowing through the electroosmotic driving module 110 in the first fluid passage and the second fluid passage is reversed, so that the function of the target liquid flowing through can be maintained by changing the fluid passage. On the basis of the flow direction of the electrode 111 (that is, to ensure that the target liquid flows from the positive electrode to the negative electrode), by changing the polarity of the power supply 130, the direction of the voltage or current applied to the functional electrode 111 can be changed, so that the functional electrode 111 can move in different directions. Reversible reaction consumption is carried out under voltage or current, that is to say, the functional electrode 111 can be changed to electrochemical reduction reaction after a period of electrochemical oxidation reaction, and then changed to electrochemical reduction reaction after a period of electrochemical reduction reaction. The electrochemical oxidation reaction is repeated, so that the functional electrode 111 can restore its redox activity, thereby having a longer redox activity life, reducing or avoiding the electrolysis of water generated by the functional electrode 111 during the working process, thereby enabling the electroosmotic pump. It can work stably for a long time, solves the problem that the existing electroosmotic pump system cannot work stably for a long time due to the electrolysis of water by the functional electrode 111, and improves the pumping efficiency and energy utilization rate of the electroosmotic pump system.

Moreover, as shown in FIG. 3 , FIG. 8 and FIG. 9 , in the electroosmotic pump system proposed in this embodiment, two connected three-way pipelines 121 are provided, so that each three-way pipeline 121 is connected to the liquid storage tank respectively. 150 is communicated with the outside world, and the electroosmotic drive module 110 is arranged at the connection of the two three-way pipelines 121, and the target liquid can flow out from the first fluid passage or the second fluid passage by opening or closing the valve. When the flow direction of the target liquid flowing through the electroosmotic drive module 110 is changed, it is only necessary to open or close the valve, which is convenient for changing the flow direction; and because the two three-way pipelines 121 are separately connected to the liquid storage tank 150 and the outside world. , so the first fluid passage and the second fluid passage do not interfere with each other, no matter whether it flows out from the first fluid passage or the second fluid passage, the target liquid can flow out stably, and no backflow occurs, which improves the electrical conductivity. The stability of the osmotic pump system.

In some embodiments of the present invention, the two three-way pipelines 121 have the same structure. Specifically, each three-way pipeline 121 is provided with a connection port, a liquid inlet and a liquid outlet, and the connection port is used for connecting with the electroosmosis. The drive module 110 is connected to the drive module 110, the liquid inlet is used to communicate with the liquid storage tank 150, and the liquid outlet is used to communicate with the outside. device, inspection device, etc., which are not specifically limited in this embodiment.

In some embodiments of the present invention, the electroosmotic drive module 110 further includes an electrode pad 112 disposed in the housing, and the electrode pad is provided with a groove 1122, the groove 1122 is used to accommodate the functional electrode 111, and the electrode pad 112 There is also an opening 1121 on the top. The opening 1121 is used for the wire 1111 of the functional electrode 111 to pass through, and the wire 1111 is electrically connected to the power source 130 .

Specifically, the electrode pad 112 is used to carry the functional electrode 111, and the lead wire 1111 of the functional electrode is connected to the lead wire on the housing. Insert the sandwich structure of electrode gasket 112 (including functional electrode 111 ) - porous medium 113 - electrode gasket 112 (including functional electrode 111 ) into the slot of the upper shell 114 (not shown in the figure) and the slot of the lower shell 115 Inside, confirm that the wires 1111 of the two functional electrodes 111 respectively pass through the opening 1141 of the upper casing and extend out of the upper casing 114, and are filled and fixed with an appropriate amount of adhesive. After the upper casing 114 and the lower casing 115 are sealed by gluing, bonding, or welding, the interface of the upper casing 114 and the interface 1152 of the lower casing constitute a fluid pipeline connection port 116 for connecting with the fluid pipeline. The opening 1121 of the electrode gasket 112 and the opening 1141 of the upper casing are sealed with sealant, and the two electrode wires 1111 extending out of the upper casing 114 are respectively electrically connected to the leads disposed on the upper casing 114 through a welding process.

In some embodiments of the present invention, the two three-way pipelines 121 are connected to both sides of the electroosmotic drive module 110 , and are specifically arranged on both sides of the casing of the electroosmotic drive module 110 and communicated with the casing, and a plurality of valves are opened or closing can form the first fluid passage or the second fluid passage, that is to say, the plurality of valves installed on the two fluid pipelines 120 in this embodiment can be opened or closed by opening or closing one or more of them to form a There are two different fluid paths for the target liquid to circulate, that is, the target liquid in the liquid storage tank 150 passes through a part of the channel in one of the fluid pipes and the functional electrode 111 in the electroosmotic drive module, and then flows from the other fluid pipe. Part of the channel of road 120 is drained.

In some embodiments of the present invention, the valve includes one or more of a solenoid valve, a one-way valve or a ball valve 321. When multiple types are used, the above-mentioned solenoid valve, one-way valve or ball valve 321 can be used in free combination. When there are two valves, two solenoid valves or two one-way valves or two ball valves 321 can be selected, or one one-way valve and one solenoid valve can be selected, and the free combination method will not be repeated here.

As shown in FIG. 1 to FIG. 7c , the above embodiments of this embodiment are described by taking the valve as a one-way valve as an example. It can be understood that when the valve is a one-way valve, the fluid pipeline of the one-way valve is expressed as a fluid pipeline. When the valve is a solenoid valve, the fluid pipeline is specifically described as the solenoid valve fluid pipeline 220 in the following embodiments. When the valve of the fluid pipeline 120 is a ball valve 321, the fluid pipeline is specifically described as a ball valve fluid pipeline 320 in the following embodiments.

As shown in FIGS. 1 to 3 , when the valve is set as a one-way valve, the fluid pipeline 120 is provided with a first electroosmotic drive module connection port 1211 , a first liquid inlet 1212 and a first liquid outlet 1213 . The first electroosmotic drive module connection port 1211 is used for communication with the electroosmotic drive module, the first liquid inlet 1212 is used for communication with the liquid storage tank 150, and the second liquid outlet 1213 is used for communication with the outside world.

As shown in FIGS. 4 to 5 c , when the valve is configured as a solenoid valve, the solenoid valve fluid pipeline 220 is provided with a second electroosmotic drive module connection port 221 , a second liquid inlet 222 and a second liquid outlet 223 . The second electroosmotic drive module connection port 221 is used for the second electroosmotic drive module connection port 221 to communicate with the electroosmotic drive module, the second liquid inlet 222 is used to communicate with the liquid storage tank 150, and the second liquid outlet 223 is used to communicate with the liquid storage tank 150. External connection.

As shown in Figures 6 to 7c, when the valve is set as a ball valve, a ball valve 321 is provided on the ball valve fluid pipeline 320, and a connection port, a liquid inlet and a liquid outlet are also provided.

It should be noted that the fluid pipeline 120 provided in this embodiment includes two three-way pipelines 121 and four one-way valves. The four one-way valves include a first one-way valve 122, a second one-way valve 123, The third one-way valve 124 and the fourth one-way valve 125 are respectively disposed before the first liquid inlet 1212 and the first liquid outlet 1213 of the three-way pipeline 121 . The opening and closing of the one-way valve is controlled by the flow direction of the fluid, that is, two fluid passages are formed according to the flow direction of the fluid pumped by the electroosmotic drive module 110 . In the fluid pipeline 120 provided in the first embodiment, the electroosmotic driving module 110 , the fluid pipeline, the power supply 130 and the control module 140 are assembled on the liquid storage tank 150 by gluing, bonding, or welding, etc. . The connecting wires 151 provided on the liquid storage tank 150 are respectively electrically connected to the lead wires on the electroosmotic driving module 110 , the power source 130 and the control module 140 through a welding process. The liquid storage tank 150 is also provided with two liquid storage openings for connecting with the two first liquid inlets 1212 of the fluid pipeline 120 .

The solenoid valve fluid pipeline 220 in the second embodiment is composed of a first solenoid valve structure 224 and a second solenoid valve structure 225 . The first solenoid valve structure 224 and the second solenoid valve structure 225 are controlled by the power supply 130 and the control module 140 to control the power-on and power-off of the coil to form two fluid passages.

In some embodiments of the present invention, the functional electrode 111 has reversible redox activity, and the functional electrode 111 includes an electrode layer and a conductive polymer layer disposed on the electrode layer.

The embodiment of the second aspect of the present invention provides a method for making a functional electrode 111 of an electroosmotic pump system, and making the functional electrode 111 in the electroosmotic pump system as described above includes the following specific steps:

A conductive polymer layer is provided on the electrode layer by electrochemical deposition, dip coating or drop coating.

In some embodiments of the invention, the electrochemical deposition method is:

The porous conductive layer is used as the electrode layer, and the mixed solution of the monomer and acid of the conductive polymer and its derivatives is used as the electrolyte solution. material layer. The conductive polymer layer is polyaniline, polypyrrole, polythiophene and derivatives thereof.

In this embodiment, a method of electrodepositing a polyaniline layer on the electrode layer by cyclic voltammetry is used to fabricate the functional electrode 111 with reversible redox activity.

Take a platinum-coated titanium mesh with a thickness of 0.1 mm and a diameter of 10 mm as the electrode layer, and a metal wire with a certain thickness is set on the platinum-coated titanium mesh as the electrical connection wire 1111. The metal wire can be a straight line or a spiral line, such as a straight line in Figure 2b . The polyaniline layer was electrodeposited by cyclic voltammetry. The platinum-coated titanium mesh was used as the working electrode, the saturated calomel electrode was used as the reference electrode, the platinum sheet electrode was used as the counter electrode, and the electrolyte solution used was aniline-sulfuric acid solution. Cyclic voltammetry The parameter scanning range is -0.2V～0.9V, and the scanning speed is 50mV/s. The thickness of the deposited polyaniline layer is controlled by setting the number of scan cycles. In this embodiment, the preferred number of scan cycles is 5 to 50 cycles.

A polyaniline layer was prepared on the electrode layer by a galvanostatic method. Using the same electrode connection method and aniline electrolyte solution as above, galvanostatic electrodeposition is carried out under the condition of current density of 0.1mA/cm2 ~ 5.0mA/cm2. In order to obtain polyaniline layers with different appropriate thicknesses, the electrodeposition time can be controlled In 600s～7200s.

The polyaniline layer was prepared on the electrode layer by potentiostatic method. The electrodes were connected according to the method described above in the examples, and in the same aniline electrolyte solution, the polymerization potential was set at 0.8V-1.6V, and the polymerization time was set at 600s-7200s. In other embodiments, in order to prepare the functional electrode 111 coated with modified polythiophene or polypyrrole, cyclic voltammetry may be performed on an electrolyte solution prepared with 3,4-ethylenedioxythiophene (EDOT) or pyrrole as a monomer. , galvanostatic method, potentiostatic method for electrodeposition. In addition to sulfuric acid, the acid used for preparing the electrolyte solution may also be hydrochloric acid, nitric acid, polystyrene sulfonic acid, and the like.

In some embodiments of the present invention, the dip coating method is as follows: the electrode layer is dipped in a mixed dispersion liquid of a conductive polymer and its derivatives and an acid, and then air-dried to form the functional electrode 111 .

In this example, a platinum-coated titanium mesh is used as the electrode layer, which is immersed in the PEDOT/PSS dispersion liquid, taken out, dried at room temperature, and repeated several times to obtain a polythiophene functional electrode 111 prepared by the dip coating method. Specifically, the used PEDOT/PSS dispersion liquid is to disperse 1.0-1.5wt% conductive grade PEDOT/PSS and 1-10% diethylene glycol in purified water. In other embodiments, the polypyrrole or polyaniline functional electrode 111 may be prepared by dip coating with a dispersion liquid prepared from PPy or PANI.

In some embodiments of the present invention, the drop-coating method is as follows: the mixed dispersion of conductive polymer and its derivatives and acid is applied to the electrode layer and then dried to form the functional electrode 111. Exemplarily, PEDOT/PSS can be The dispersed droplets are coated on the electrode layer, and then dried at room temperature to obtain a polythiophene-modified functional electrode 111 . The used PEDOT/PSS dispersion liquid is 1.0-1.5wt% conductive grade PEDOT/PSS and 1-10% diethylene glycol dispersed in purified water.

An embodiment of the third aspect of the present invention provides a fluid delivery method, which is implemented by using the electroosmotic pump system provided by the embodiment of the first aspect, and the fluid delivery method includes:

Control the power supply to apply voltage to the electroosmotic drive module, so that the two functional electrodes of the electroosmotic drive module perform electrochemical reduction reaction and electrochemical oxidation reaction respectively, and at the same time control the target liquid to flow through the electroosmotic drive from the liquid reservoir along the first fluid path After the module flows to the outside world;

Specifically, when controlling the flow of the target liquid in this step, according to the fluid pipeline of the electroosmotic pump system proposed in the above-mentioned embodiments, multiple valves are provided, so the flow of the target liquid through which the target liquid flows can be controlled by opening or closing some of the valves. fluid pathway. After the set time, the polarity of the power supply is controlled to change, so that the functional electrode for electrochemical reduction is changed to electrochemical oxidation, and the functional electrode for electrochemical oxidation is changed to electrochemical reduction, and the target is controlled at the same time. The liquid flows from the liquid reservoir along the second fluid passage through the electroosmotic drive module and then flows to the outside world. The flow direction of the target liquid flowing through the electroosmotic drive module in the second fluid passage is the same as the flow direction of the target liquid flowing through the electroosmotic drive module in the first fluid passage. The flow direction of the modules is reversed.

In this step, the set time can be set according to the service life and degree of use of the functional electrode, for example, the set time can be set according to the duration of the electrochemical oxidation reaction or electrochemical reduction reaction that the functional electrode can perform; in this step Controlling the flow of the target liquid can also control the fluid passage through which the target liquid flows by opening or closing some of the valves. It can be understood that the path of the second fluid passage in this step is different from that of the first fluid passage. When the electroosmosis drive module, it needs to flow from the positively charged functional electrode to the negatively charged functional electrode. Therefore, when the polarity of the power supply is changed, the positive and negative polarities of the two functional electrodes are exchanged, so the flow path of the target liquid needs to be changed accordingly. , that is, the flow direction of the target liquid flowing through the electroosmotic drive module in the second fluid passage in this step is opposite to the flow direction of the target liquid flowing through the electroosmotic drive module in the first fluid passage, thereby ensuring the normal operation of the electroosmotic pump system. , while ensuring that the functional electrode can repair its own redox activity.

It should be noted that the fluid delivery method proposed in this embodiment can repeat the operation after performing the above two steps, and the specific number of times can be set according to the actual situation, so that the functional electrode can realize the redox activity during the working process. Repair to ensure that the electroosmotic pump system can work stably for a long time.

The fluid delivery method proposed in this embodiment utilizes the functional electrode 111 with reversible redox activity, and can maintain the flow direction of the target liquid flowing through the functional electrode 111 by changing the fluid path, so that by changing the polarity of the power supply 130, the functional electrode can be 111 undergoes reversible reaction consumption under voltages or currents in different directions, that is to say, after the functional electrode 111 undergoes an electrochemical oxidation reaction for a period of time, it is changed to an electrochemical reduction reaction, and after a period of electrochemical reduction reaction , and then perform electrochemical oxidation reaction, so that the functional electrode 111 can restore its redox activity during the working process, so as to have a longer redox activity life, reducing or avoiding the process of the functional electrode 111 in the process of transporting fluid The electrolysis of water generated in the pump reduces the impact on the physical and chemical properties of the target liquid to be pumped. For example, in the process of pumping protein-based liquid medicine, this embodiment reduces the risk of reducing the efficacy of the liquid medicine, and can ensure the electrical The osmotic pump can work stably for a long time, and also solves the problem that the existing electroosmotic pump cannot work stably for a long time due to the electrolysis of water by the functional electrode 111; Whether the target liquid flows out from the first fluid passage or from the second fluid passage, the target liquid can flow out stably, and no backflow occurs, which improves the working stability of the electroosmotic pump system.

Exemplarily, when the valve adopts a one-way valve, as shown in FIG. 8 , specifically, the control module 140 controls the power supply 130 to apply a left “﹣” right “﹢” between the two functional electrodes 111 of the electroosmotic drive module 110 . If the driving voltage or current is high, the left functional electrode 111 undergoes electrochemical reduction, and the right functional electrode 111 undergoes electrochemical oxidation, resulting in electrode consumption. At the same time, the electroosmotic drive module 110 generates a pumping force in the direction ① to drive the target liquid to flow from right to left, further opening the first one-way valve 123 and the third one-way valve 124, that is, forming the fluid passage 1 and the liquid storage tank The target liquid in 150 is then pumped out along the fluid path 1 . As shown in FIG. 9 , after a period of time, the power supply 130 is controlled by the control module 140 to change the direction (polarity) of the driving voltage or current, between the two functional electrodes 111 of the electroosmotic driving module 110 is left "﹢" right " ﹣”, the left functional electrode 111 that has been reduced to a certain degree undergoes electrochemical oxidation, and the right functional electrode 111 that has been oxidized to a certain degree undergoes electrochemical reduction, so that the functional electrode 111 can be regenerated. At the same time, the direction of the pumping force generated by the electroosmotic drive module 110 is changed to ②, so that the target fluid flows from left to right, and the first one-way valve 122 and the fourth one-way valve 125 are further opened to form a fluid passage. 2. The target liquid in the reservoir 150 is pumped out along the fluid path 2. In this way, by controlling the power supply 130 by the control module 140 to alternately change the direction (polarity) of the driving voltage or current applied to the electroosmotic driving module 110, the functional electrodes 111 can be cyclically consumed and regenerated, and the functional electrodes 111 can be consumed and regenerated according to the fluid paths 1 and 110, respectively. The fluid passage 2 pumps the target liquid outwards stably for a long time without backflow.

With the fluid delivery method proposed in this embodiment, no matter how the direction of the voltage/current applied by the control module to control the power supply to the functional electrode changes, the target liquid can be pumped out of the liquid storage tank, which not only solves the problem of electroosmotic pump electrolysis of water , bubbles and the problem of not being able to work stably for a long time, but also to ensure its pumping efficiency and energy utilization, and to ensure the stability of fluid delivery. The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

An electroosmotic pump system, comprising:

a liquid storage tank, the liquid storage tank contains the target liquid;

an electroosmotic drive module, the electroosmotic drive module includes a porous medium and two functional electrodes arranged on both sides of the porous medium, and the functional electrodes have reversible redox activity;

A fluid pipeline, the fluid pipeline includes two connected three-way pipelines, the electroosmotic drive module is arranged at the connection between the two three-way pipelines, and each of the three-way pipelines is connected separately the liquid reservoir and the outside;

A plurality of valves, the plurality of valves are arranged on the fluid pipeline, and the plurality of valves are opened or closed to form a flow for the target liquid to flow from the liquid reservoir through the electroosmotic drive module to the The external first fluid passage and the second fluid passage, the flow direction of the target liquid flowing through the electroosmotic drive module in the first fluid passage is the same as the flow direction of the target liquid flowing through the electroosmotic drive module in the second fluid passage The flow direction of the electroosmotic drive module is opposite;

a power source, the power source is electrically connected to the functional electrode;

a control module for controlling the power supply and the plurality of valves.
The electroosmotic pump system according to claim 1, wherein the three-way pipeline is provided with a connection port, a liquid inlet and a liquid outlet, the connection port is communicated with the electroosmotic drive module, and the liquid inlet communicated with the liquid storage tank, and the liquid outlet communicated with the outside world.
The electroosmotic drive module further includes a casing and an electrode pad, the porous medium, the functional electrode and the electrode pad are respectively arranged in the casing, a groove is provided on the electrode pad, and the electrode pad is provided with a groove. The groove is used for accommodating the functional electrode, and the electrode pad is further provided with an opening, and the opening is used for the wire of the functional electrode to pass through, and the wire is electrically connected to the power supply.
The electroosmotic pump system according to claim 1, wherein the plurality of valves comprise one or more of a solenoid valve, a one-way valve, and a ball valve.
The electroosmotic pump system according to any one of claims 1 to 4, wherein the functional electrode comprises an electrode layer and a conductive polymer layer disposed on the electrode layer.
A method of making a functional electrode of an electroosmotic pump system, wherein the method of making a functional electrode of the electroosmotic pump system is used to make the electroosmotic pump system as claimed in any one of claims 1-5. Functional electrodes, including:

A conductive polymer layer is provided on the electrode layer of the functional electrode by electrochemical deposition, dip coating or drop coating.
The method for making a functional electrode of an electroosmotic pump system according to claim 6, wherein the electrochemical deposition method comprises:

The porous conductive layer is used as the electrode layer, and the mixed solution of the monomer and acid of the conductive polymer and its derivatives is used as the electrolyte solution. the conductive polymer layer.
The method for manufacturing a functional electrode of an electroosmotic pump system according to claim 6, wherein the dip coating method comprises: dipping the electrode layer in a mixture of the conductive polymer and its derivatives and an acid The dispersion liquid is then air-dried to form the functional electrode.
The method for manufacturing a functional electrode of an electroosmotic pump system according to claim 6, wherein the drop-coating method comprises: applying a mixed dispersion of the conductive polymer and its derivatives and an acid to the The electrode layer is then dried to form the functional electrode.
A fluid delivery method, characterized in that the fluid delivery method is implemented by using the electroosmotic pump system according to any one of claims 1-5, and the fluid delivery method comprises:

The power supply is controlled to apply a voltage to the electroosmotic drive module, so that the functional electrodes of the electroosmotic drive module are respectively subjected to electrochemical reduction reaction and electrochemical oxidation reaction, and at the same time, the target liquid is controlled to flow from the liquid reservoir along the first fluid passage through the electro-osmotic drive module. After infiltrating the drive module, it flows to the outside world;

After a set time, the polarity of the power source is controlled to change, so that the functional electrode that performs electrochemical reduction reaction is changed to perform electrochemical oxidation reaction, and the functional electrode that performs electrochemical oxidation reaction is changed to perform electrochemical reduction reaction. Controlling the flow of the target liquid from the liquid storage tank through the electroosmotic driving module along the second fluid path to the outside, and the flow of the target liquid flowing through the electroosmotic driving module in the second fluid path The direction is opposite to the direction of flow of the target liquid through the electroosmotic drive module in the first fluid pathway.