CN115979901A - System for electrowetting experimental study based on variable force field generated by centrifugal machine platform - Google Patents
System for electrowetting experimental study based on variable force field generated by centrifugal machine platform Download PDFInfo
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Abstract
The invention relates to the field of fluid mechanics research, in particular to a system for carrying out electrowetting experiment research based on a variable force field generated by a centrifuge platform. The invention includes a centrifuge platform; the centrifuge platform comprises: a drive assembly and a turntable assembly; an experiment module is arranged on the turntable assembly; the experimental module comprises a working medium storage unit, an injector unit, a basic electrowetting experimental unit and an electrowetting liquid drop transport experimental unit; the driving assembly drives the turntable assembly to rotate and provides a variable force field environment for each unit on the turntable assembly; the working medium storage unit stores working medium fluid used in the experiment; the liquid injector unit injects the working medium fluid in the working medium storage unit into the basic electrowetting experiment unit or/and the electrowetting liquid drop transportation experiment unit; the basic electrowetting experimental unit performs a basic electrowetting experiment under a variable force field; and the electrowetting liquid drop transport experiment unit performs a liquid drop transport experiment under a variable force field. The invention provides a variable force field experimental platform for researching electrowetting.
Description
Technical Field
The invention relates to the field of foundation hydrodynamics experiments and space science experiments, in particular to a system for carrying out electrowetting experiment research based on a variable force field generated by a centrifuge platform.
Background
Capillary and interfacial phenomena are widely present in everyday life and engineering applications. On the ground, the effect of surface tension is gradually prominent with the decrease of flow dimension, and when the flow space reaches below the capillary dimension, the effect of surface tension is larger than the effect of gravity. While viscous effects and flow resistance increase significantly as the reynolds number decreases, driving the fluid against external pressure differentials becomes very inefficient. In a space microgravity environment, surface tension and capillary phenomena become more important due to the loss of gravity. The driving action of the surface tension on the fluid is not limited by the space scale, and the fluid still climbs and moves at the position where the two-phase interface is contacted with the wall surface in a large space. Therefore, the surface tension is the only effective driving force for fluid management, transportation and gas-liquid phase separation under the space microgravity environment and variable gravity. At present, capillary and interface phenomena are also key research contents developed internationally and in hydromechanics experiments in China.
It is worth emphasizing that, as the demands for directional fluid transportation and precise control of the fluid in the processes of space spacecraft thermal management, fluid management, lunar resource development and utilization and the like are continuously clear, the active control method and the control theory of the interface need to be further deeply considered. The electrowetting phenomenon is a method that drives the interface deformation and controls the fluid movement by causing an imbalance of the fluid surface forces. Therefore, the active electrowetting process is an exquisite means for fluid transportation and interface morphology manipulation, and the technology has great application potential in both ground and space environments.
Disclosure of Invention
The invention aims to provide an electrowetting experiment research system based on a centrifuge rotating platform, which utilizes the centrifuge rotating platform to carry out a basic electrowetting experiment and an electrowetting liquid drop transport experiment, and provides a better experiment platform for researching the movement mechanism of basic electrowetting, the macroscopic rule of liquid drop transport under electrowetting and observing the dynamic change of a two-phase interface and a three-phase contact state.
In order to achieve the above purpose, the invention is realized by the following technical scheme.
The invention provides a system for electrowetting experimental study based on a variable force field generated by a centrifuge platform, which comprises: a centrifuge platform; the centrifuge platform comprises: a drive assembly and a turntable assembly;
an experiment module is placed on the turntable assembly; the experimental module comprises: the device comprises a working medium storage unit, a liquid injector unit, a basic electrowetting experiment unit and an electrowetting liquid drop transport experiment unit;
the driving assembly is used for driving the turntable assembly to rotate and providing a variable force field environment for the experiment unit on the turntable assembly;
the working medium storage unit is used for storing working medium fluid used in an experiment;
the liquid injector unit is used for injecting the working medium fluid in the working medium storage unit into the basic electrowetting experiment unit or/and the electrowetting liquid drop transportation experiment unit;
the basic electrowetting experiment unit is used for carrying out an electrowetting liquid drop driving experiment under a variable force field, namely, the liquid drop on the electrode plate is driven to move by changing the amplitude and the waveform of the voltage applied to the electrode plate;
the electrowetting liquid drop transport experiment unit is used for carrying out liquid drop transport experiments under a variable force field, namely, liquid drop transport is driven by changing the activation sequence of continuous electrodes.
As an improvement of the above technical solution, the centrifuge platform further comprises a support assembly; the support assembly includes: the centrifugal machine comprises a centrifugal machine control module, a power supply module and a communication module; wherein the content of the first and second substances,
the centrifuge control module is used for controlling the centrifuge platform and comprises the starting, stopping and rotating speed of the turntable assembly; and providing instructions to an experiment module, comprising: starting an experiment, controlling a liquid injector and collecting waste liquid;
the power supply module is used for providing power supply;
and the communication module is used for communicating with the centrifuge platform and the experiment module and transmitting data and instructions in the experiment process.
As one improvement of the technical scheme, the control modules and the experiment modules at the left end and the right end of the turntable assembly have the same weight, the gravity centers of the two modules are relatively consistent and are equidistant from the central point, namely, the two modules are symmetrically distributed, so that the balance of the centrifuge platform is kept.
As an improvement of the above technical solution, the experiment module further includes: the device comprises an experiment control unit, an image acquisition unit and a waste liquid collection unit; wherein the content of the first and second substances,
the experiment control unit is used for starting an experiment, controlling the liquid injector unit and the waste liquid collecting unit, adjusting the voltage required in the electrowetting experiment process, exchanging information with the centrifuge platform, and converting the power supply voltage provided by the centrifuge platform into various voltages required by the experiment module;
the image acquisition unit is used for shooting and recording experimental processes of electrowetting liquid drop driving and electrowetting liquid drop transportation;
and the waste liquid collecting unit is used for collecting the liquid drops which are subjected to the experiment after the experiment is finished so as to facilitate the experiment of the next liquid drop.
As an improvement of the above technical solution, the experiment control unit includes: the system comprises a power supply conversion subunit, an information exchange subunit, an experiment process control subunit and a data acquisition subunit; wherein the content of the first and second substances,
the power supply conversion subunit is used for respectively converting the voltage provided by the centrifuge platform into the voltage required by the waste liquid collection unit and the voltage required by the experiment control unit;
the information exchange subunit is used for receiving an instruction of the centrifuge platform and transmitting experimental data to the experimental module;
the experimental process control subunit is used for controlling the whole experimental process, and comprises: starting an experimental process, controlling a liquid injector to inject liquid, controlling a camera to start photographing, outputting and adjusting voltage applied to working medium liquid drops in an electrowetting process, controlling the whole experimental process of electrowetting liquid drop driving and liquid drop transportation and waste liquid drop collection;
the data acquisition subunit is used for acquiring data in the experimental process, including temperature data, pressure data and process control data.
As one improvement of the above technical solution, the image acquisition unit includes a light source, a microscopic view field observation camera and a macroscopic view field observation camera; wherein the content of the first and second substances,
the light source is used for providing illumination for the basic electrowetting experiment unit and the electrowetting liquid drop transportation experiment unit so that the camera can clearly shoot and record the experiment process;
the microscopic view field observation camera comprises a multi-azimuth microscopic camera and is used for clearly shooting and recording the electrowetting liquid drop driving experiment in multiple azimuth directions;
the macroscopic view field observation camera comprises a multi-azimuth macroscopic camera and is used for performing macroscopic shooting and recording of an electrowetting liquid drop transport experiment in multiple azimuth.
As one improvement of the technical scheme, the waste liquid collecting unit comprises a waste liquid storage tank, a sponge and a fan; wherein the content of the first and second substances,
the waste liquid storage tank is used for storing liquid drops after an electrowetting liquid drop driving experiment and an electrowetting liquid drop transport experiment are finished, so that pollution is prevented;
the sponge is used for adsorbing the waste liquid drops after an electrowetting liquid drop driving experiment and an electrowetting liquid drop conveying experiment so that the liquid drops smoothly enter the waste liquid storage tank;
the fan is used for blowing the liquid drops in the basic electrowetting experiment unit to the adsorption sponge; the droplets of the electrowetting droplet transport experimental unit are driven onto the adsorption sponge by means of an activated electrode switch.
As an improvement of the above technical solution, the basic electrowetting experimental unit includes: the device comprises a first transparent experimental cavity, a first experimental table, a first bottom substrate and liquid drops; wherein the content of the first and second substances,
the first experiment table is used for providing an experiment environment for an electrowetting liquid drop driving experiment;
the first bottom substrate comprises a first substrate, an electrode layer, a first dielectric layer and a first hydrophobic layer, is used for containing liquid drops required by an experiment and provides driving force for the movement of the liquid drops;
when an electrowetting droplet driving experiment is carried out, a potential difference is formed between the droplet and the bottom substrate to generate an electrowetting effect.
As an improvement of the above technical solution, the electrowetting droplet transport experiment unit includes: the device comprises a second transparent experimental cavity, a second experimental table, a second bottom substrate and liquid drops; wherein the content of the first and second substances,
the second experiment table is used for providing an experiment environment for the electrowetting liquid drop transport experiment;
the second bottom substrate comprises a second substrate, a plurality of dressing electrodes, a second dielectric layer and a second hydrophobic layer, and the second bottom substrate is used for providing driving force for liquid drop transportation by controlling the switch of the adjacent electrodes;
when an electrowetting liquid drop transportation experiment is carried out, the liquid drop is placed on the second bottom substrate, the base diameter of the liquid drop is at least positioned on the two electrodes, and the liquid drop is transported from one section of the second transparent experiment cavity to the other section.
As an improvement of the above-described aspect, the injector unit includes: a micro-injection pump, an electromagnetic valve and a needle head; wherein the content of the first and second substances,
the micro-injection pump is connected with the working medium storage unit and is used for injecting the working medium liquid in the working medium storage unit into the basic electrowetting experiment unit or/and the electrowetting liquid drop transportation experiment unit;
the electromagnetic valve is used for controlling whether to inject liquid into the basic electrowetting experiment unit or/and the electrowetting liquid drop transportation experiment unit and the volume of the injected liquid; before the experiment starts, the electromagnetic valve is opened for a certain time, and a certain amount of liquid is injected into the basic electrowetting experiment unit or/and the electrowetting liquid drop transport experiment unit; after liquid injection is finished, closing the electromagnetic valve switch;
the needle head is positioned in the bottom substrate of the experiment cavity and used for injecting the liquid provided by the working medium storage unit to the bottom substrate of the experiment cavity in the form of liquid drops.
Compared with the prior art, the invention has the advantages that:
1. the invention utilizes the centrifuge rotating platform to carry out electrowetting experiments under different force fields, and provides a brand-new variable force field experiment platform for researching the movement mechanism of basic electrowetting, the macroscopic rule of droplet transportation under electrowetting and observing the dynamic change of a two-phase interface and a three-phase contact state;
2. compared with the prior art, the system provided by the invention can research the movement mechanism of electrowetting in a variable force field environment, complete the droplet transportation process based on electrowetting and enable scientific researchers to research the influence of different acting force conditions on electrowetting movement. Its main application is the efficient management of fluids in space.
Drawings
FIG. 1 is a model of the present invention;
FIG. 2 is a block diagram of the present invention;
FIG. 3 is a cross-sectional view of a basic electrowetting cell of the present invention;
FIG. 4 is a schematic diagram of a cosmetic electrode for an electrowetting droplet transport experiment of the present invention;
FIG. 5 shows a substrate structure of an experimental unit according to the present invention;
FIG. 6 is a block diagram of the centrifuge spin stand of the present invention.
Detailed Description
The invention discloses a system for carrying out electrowetting experimental research based on a variable force field generated by a centrifuge rotating platform, and relates to the field of fluid mechanics research. The system comprises: the centrifuge platform comprises a supporting component, a driving component and a turntable component, and the experiment unit comprises an experiment control unit, an image acquisition unit, a working medium storage unit, a liquid injector unit, a basic electrowetting experiment unit, an electrowetting liquid drop transport experiment unit and a waste liquid collection unit.
The invention relates to a variable force field electrowetting experimental research system based on a centrifuge rotating platform, which comprises:
the centrifuge platform (comprising a supporting component, a driving component and a turntable component) and an experiment unit (comprising an experiment control unit, an image acquisition unit, a working medium storage unit, a liquid injector unit, a basic electrowetting experiment unit, an electrowetting liquid drop transport experiment unit and a waste liquid collection unit); wherein, the first and the second end of the pipe are connected with each other,
the supporting assembly is used for providing control instructions, data communication and a driving power supply for other assemblies, and the functions of controlling the rotating speed of each experimental unit centrifuge, controlling a power supply switch, communicating instructions and data and the like are realized;
the driving assembly is used for driving the turntable assembly to rotate and providing a variable force field environment for each experiment unit on the turntable assembly;
the turntable assembly is used for placing an experiment unit and an experiment control unit, wherein the experiment unit and the control unit are respectively placed at two ends of the turntable;
the experiment control unit is used for starting an experiment, controlling the liquid injector unit and the waste liquid collecting unit, adjusting the voltage required in the electrowetting experiment process, exchanging information with the centrifuge rotating platform, and converting the power supply voltage provided by the centrifuge rotating platform into various voltages required by the electrowetting module;
the image acquisition unit is used for shooting and recording the experimental processes of basic electrowetting and electrowetting liquid drop transportation, and is convenient for later-stage checking of experimental process playback and research work of scientific researchers;
the working medium storage unit is used for storing working fluid used in the experiment, and the stored working fluid can be used for thousands of experiments at a time;
the liquid injector unit is used for injecting the working medium fluid in the working medium storage unit into the basic electrowetting experiment unit and the electrowetting liquid drop transportation experiment unit;
the basic electrowetting experimental unit is a transparent square experimental cavity and is used for carrying out basic electrowetting experiments under a variable force field;
the electrowetting liquid drop transport experiment unit is a transparent rectangular experiment cavity and is used for carrying out liquid drop transport experiments under a variable force field;
the waste liquid collecting unit is used for collecting the liquid drops for the experiment after the experiment is finished so as to carry out the experiment of the next liquid drop.
The support assembly comprises a centrifuge control module, a power supply module and a communication module; wherein, the first and the second end of the pipe are connected with each other,
the centrifuge control module is used for controlling the starting and the rotating speed of the centrifuge rotating platform, providing instructions for starting an experiment, controlling a liquid injector, collecting waste liquid and the like for a control unit in the experiment unit, and realizing the control of the dynamic balance module;
the power supply module is used for providing power supply for the rotation of the centrifuge, the experiment unit and the like;
the communication module is used for communicating with a driving assembly of the centrifuge and a control module of the experiment unit and transmitting data/instructions required by the experiment and image data shot in the experiment process.
The driving assembly comprises a motor and a motor controller; wherein the content of the first and second substances,
the motor is used for providing power for the movement of the centrifuge, and the rotating speed of the rotating disc can be controlled through the rotating speed of the motor, so that different centrifugal forces are provided for the experiment unit;
and the motor controller is connected with the turntable assembly and used for providing energy required by rotary driving for each experiment unit on the turntable assembly.
The turntable assembly comprises a platform for placing an experiment unit and an experiment control unit, the control modules and the experiment modules at the left end and the right end have the same weight, the gravity center positions of the two modules are relatively consistent, and the distances between the two modules and a central point are equal, namely the two modules are symmetrically distributed, so that the balance of the centrifuge platform is kept;
the turntable assembly is used for placing modules required in an experiment and rotates around a fixed point under the driving of a motor, so that a variable force field environment is provided for the experiment.
The experiment control unit comprises a power supply conversion function, an information exchange function, an experiment process control function and a data acquisition function; wherein the content of the first and second substances,
the power supply conversion function is used for converting primary voltage provided by the rotary platform of the centrifuge into voltage required by the waste liquid collecting device and voltage required by the control system;
the information exchange function is used for receiving an instruction of the centrifuge rotating platform and transmitting experimental data to the experimental module;
the control experiment process is used for starting the experiment process, controlling the liquid injection of the liquid injector, controlling the camera to start to photograph, outputting and adjusting the voltage applied to the working medium liquid drops in the electrowetting process, controlling the whole basic electrowetting and the experiment process of liquid drop transportation, collecting waste liquid drops and the like;
the data acquisition function is used to acquire data during the experimental process, including temperature data, pressure data, process control data (voltage and current in the control system), and the like.
The image acquisition unit comprises a light source, a microscopic view field observation camera and a macroscopic view field observation camera; wherein the content of the first and second substances,
the light source is used for providing illumination for the basic electrowetting experiment unit and the electrowetting liquid drop transportation experiment unit, so that the camera can clearly shoot and record the experiment process;
the microscopic view field observation camera comprises a multidirectional (side surface and top) microscopic camera and is used for clearly shooting and recording a multidirectional acquisition basic electrowetting experiment;
the macroscopic view field observation camera comprises a multidirectional (side and top) macroscopic camera and is used for macroscopically shooting and recording an electrowetting liquid drop transport experiment in a multidirectional mode.
The working medium storage unit comprises two storage tanks with the same size, wherein,
the storage tank is essentially a liquid storage tank, and the two storage tanks are respectively used for providing liquid for a basic electrowetting experiment and an electrowetting liquid drop transportation experiment.
The liquid injector unit comprises a micro liquid injection pump, an electromagnetic valve and a needle head; wherein the content of the first and second substances,
the micro-injection pump is connected with the working medium storage unit and is used for helping the storage tank to provide liquid for the experiment;
the electromagnetic valve is used for controlling whether liquid is injected into the experimental cavity or not and the volume of the injected liquid; before the experiment begins, the electromagnetic valve is opened for a certain time to inject a certain amount of liquid into the experiment cavity; after liquid injection is finished, closing the electromagnetic valve switch;
the needle is positioned in the experiment cavity bottom plate and is used for injecting the liquid provided by the storage box into the experiment cavity bottom plate in the form of liquid drops.
The basic electrowetting experiment unit comprises an experiment table, a bottom substrate and liquid drops; wherein the content of the first and second substances,
the experiment table is used for providing an experiment environment for a basic electrowetting experiment;
the bottom substrate comprises a substrate, an electrode layer, a dielectric layer and a hydrophobic layer, is used for accommodating liquid drops required by an experiment and provides driving force for the movement of the liquid drops;
the liquid drop is used for forming an electric potential difference with the bottom substrate to generate an electrowetting effect.
The electrowetting liquid drop transport experiment unit comprises an experiment table, a bottom substrate and liquid drops; wherein, the first and the second end of the pipe are connected with each other,
the experiment table is used for providing an experiment environment for the electrowetting liquid drop transport experiment;
the bottom substrate comprises a substrate, a plurality of dressing electrodes, a dielectric layer and a hydrophobic layer, and the bottom substrate is used for providing driving force for liquid drop transportation by controlling the switch of the adjacent electrodes;
the liquid drops are placed on the bottom substrate, and the base diameters of the liquid drops are at least positioned on the two electrodes and are used for being transported from one section of the experiment cavity to the other section of the experiment cavity.
The waste liquid collecting unit comprises a waste liquid storage tank, a sponge and a fan; wherein the content of the first and second substances,
the waste liquid storage tank is used for storing liquid drops after the experiment is finished and preventing the liquid drops from polluting subsequent experiments;
the sponge is used for adsorbing the waste liquid drops after the experiment, so that the liquid drops smoothly enter the waste liquid storage tank;
the fan is used for blowing the liquid drops in the basic electrowetting experiment unit to the adsorption sponge; the droplets of the electrowetting droplet transport experimental unit are driven onto the adsorption sponge by activating an electrode switch.
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and examples.
FIG. 1 is a diagram showing a model of the system of the present invention; fig. 2 is a block diagram showing the specific components of the system of the present invention. The system of the invention comprises:
the centrifuge platform (comprising a supporting component, a driving component and a turntable component) and an experiment unit (comprising an experiment control unit, an image acquisition unit, a working medium storage unit, a liquid injector unit, a basic electrowetting experiment unit, an electrowetting liquid drop transport experiment unit and a waste liquid collection unit); wherein the content of the first and second substances,
the supporting assembly is used for providing control instructions, data communication and a driving power supply for other assemblies, and the functions of controlling the rotating speed of each experimental unit centrifuge, controlling a power supply switch, communicating instructions and data and the like are realized;
the driving assembly is used for driving the turntable assembly to rotate and providing a variable force field environment for each experiment unit on the turntable assembly;
the turntable assembly is used for placing an experiment unit and an experiment control unit, wherein the experiment unit and the control unit are respectively placed at two ends of the turntable, which are equidistant to the center;
the experiment control unit is used for starting an experiment, controlling the liquid injector unit and the waste liquid collecting unit, adjusting the voltage required in the electrowetting experiment process, exchanging information with the centrifuge rotating platform, and converting the power supply voltage provided by the centrifuge rotating platform into various voltages required by the electrowetting module;
the image acquisition unit is used for shooting and recording the experimental processes of basic electrowetting and electrowetting liquid drop transportation, and is convenient for later-stage checking of experimental process playback and research work of scientific researchers;
the working medium storage unit is used for storing working fluid used in the experiment, and the stored working fluid can be used for thousands of experiments at a time;
the liquid injector unit is used for injecting the working medium fluid in the working medium storage unit into the basic electrowetting experiment unit and the electrowetting liquid drop transportation experiment unit;
the basic electrowetting experimental unit is a transparent square experimental cavity and is used for carrying out basic electrowetting experiments under a variable force field;
the electrowetting liquid drop transport experiment unit is a transparent rectangular experiment cavity and is used for carrying out liquid drop transport experiments under a variable force field;
the waste liquid collecting unit is used for collecting the liquid drops for the experiment after the experiment is finished so as to carry out the experiment of the next liquid drop.
The centrifuge control module is used for controlling the starting and the rotating speed of the centrifuge rotating platform, providing instructions for starting an experiment, controlling a liquid injector, collecting waste liquid and the like for a control unit in the experiment unit, and realizing the control of the dynamic balance module;
the power supply module is used for providing power for centrifuge rotation, experiment units and the like, and the output of the power supply module is primary voltage;
the communication module is used for communicating with a driving assembly of the centrifuge and a control module of the experiment unit and transmitting data/instructions required by the experiment and image data shot in the experiment process.
The motor is used for providing power for the movement of the centrifuge, and the rotating speed of the centrifuge can be controlled through the rotating speed of the motor, so that different centrifugal forces are provided for the experiment unit;
the centrifugal machine is connected with the rotary disc assembly and used for providing centrifugal force for each experiment unit on the rotary disc assembly.
The experiment unit is used for placing modules required in the experiment, so that a variable force field environment is provided for the experiment.
The experiment control unit comprises a power supply conversion function, an information exchange function, an experiment process control function and a data acquisition function; wherein the content of the first and second substances,
the power supply conversion function is used for converting primary voltage provided by the rotary platform of the centrifuge into 24V voltage required by the waste liquid collecting device and 3.3V, 5V and 12V voltage required by the control system;
the information exchange function is used for receiving an instruction of the variable gravity experiment cabinet and transmitting experiment data to the centrifuge rotating platform;
the control experiment process is used for starting the experiment process, controlling the liquid injection of the liquid injector, sending a command to be photographed to the centrifuge rotating platform, starting the camera by the centrifuge rotating platform to start photographing, outputting and adjusting the voltage applied to the working medium liquid drops in the electrowetting process, controlling the whole basic electrowetting and liquid drop transportation experiment process, collecting waste liquid drops and the like;
the data acquisition function is used to acquire data during the experimental process, including temperature data, pressure data, process control data (voltage and current in the control system), and the like.
The image acquisition unit comprises a light source, a microscopic view field observation camera and a macroscopic view field observation camera; wherein the content of the first and second substances,
the light source is used for providing illumination for the basic electrowetting experiment unit and the electrowetting liquid drop transportation experiment unit, so that the camera can clearly shoot and record the experiment process;
the microscopic view field observation camera comprises a multidirectional (side surface and top) microscopic video camera for photographing and recording a multidirectional acquisition basic electrowetting experiment, the minimum view field is 20mm multiplied by 20mm, the spatial resolution is 15 mu m, and the acquisition rate is 50fps;
the macroscopic view field observation camera comprises a multidirectional (side and top) macroscopic camera for photographing and recording an electrowetting liquid drop transport experiment in a multidirectional mode, the view field is 200mm multiplied by 70mm, the spatial resolution is 90 mu m, and the acquisition rate is 50fps.
The working medium storage unit comprises two storage tanks with the same size, wherein,
the storage tank is essentially a liquid storage tank, the diameter of the storage tank is 50mm, the length of the storage tank is 100mm, the liquid storage amount is about 0.2 liter, and the two storage tanks are respectively used for providing liquid for a basic electrowetting experiment and an electrowetting liquid drop transportation experiment.
The liquid injector unit comprises a micro liquid injection pump, an electromagnetic valve and a needle head; wherein the content of the first and second substances,
the micro-injection pump is connected with the working medium storage unit and is used for helping the storage tank to provide liquid for the experiment;
the electromagnetic valve is used for controlling whether to inject liquid into the experiment cavity or not and the volume of the injected liquid; before the experiment begins, the electromagnetic valve is opened for a certain time to inject a certain amount of liquid into the experiment cavity; after liquid injection is finished, closing the electromagnetic valve switch;
the needle is positioned in the experiment cavity bottom plate and is used for injecting the liquid provided by the storage box into the experiment cavity bottom plate in the form of liquid drops.
Fig. 3 is a cross-sectional view of a basic electrowetting experimental unit according to the present invention. The basic electrowetting experiment unit comprises an experiment table, a bottom substrate and liquid drops; wherein the content of the first and second substances,
the experiment table is used for providing an experiment environment for a basic electrowetting experiment;
the bottom substrate comprises a substrate, an electrode layer, a dielectric layer and a hydrophobic layer, is used for containing liquid drops required by an experiment and provides driving force for the movement of the liquid drops;
the liquid drop is used for forming an electric potential difference with the bottom substrate to generate an electrowetting effect.
The electrowetting liquid drop transport experiment unit comprises an experiment table, a bottom substrate and liquid drops; wherein the content of the first and second substances,
the experiment table is used for providing an experiment environment for the electrowetting liquid drop transport experiment;
the bottom substrate comprises a substrate, 6-10 dressing electrodes, a dielectric layer and a hydrophobic layer, and is used for providing driving force for liquid drop transportation by controlling the on-off of the adjacent electrodes; fig. 4 shows a cosmetic electrode diagram of the electrowetting droplet transport experiment of the present invention. As shown in fig. 5, it is a schematic structural diagram of an experimental unit substrate (including a base substrate of a basic electrowetting experimental unit and a base substrate of an electrowetting droplet transport experimental unit) according to the present invention; wherein, from the bottom up include in proper order: a substrate material, an electrode material, a dielectric material, and a hydrophilic/hydrophobic material. In its experiment, the working fluid and the ambient fluid form a phase interface.
The liquid drops are placed on the bottom substrate, the base diameters of the liquid drops are at least located on the two electrodes, and the liquid drops are used for being conveyed from one section of the experiment cavity to the other section.
The waste liquid collecting unit comprises a waste liquid storage tank, sponge and a fan; wherein the content of the first and second substances,
the waste liquid storage tank is used for storing liquid drops after the experiment is finished and preventing the liquid drops from polluting the subsequent experiment;
the sponge is used for adsorbing the waste liquid drops after the experiment, so that the liquid drops smoothly enter the waste liquid storage tank;
the fan is used for blowing the liquid drops in the basic electrowetting experiment unit to the adsorption sponge; the liquid drops of the electrowetting liquid drop transport experiment unit are driven to the adsorption sponge by activating an electrode switch.
Example 1
Embodiment 1 of the present invention provides a method for researching a basic electrowetting experiment based on a centrifuge spin platform (as shown in fig. 6, which is a schematic view of a centrifuge spin platform of the present invention), which can perform a basic electrowetting experiment on droplets with different dimensions and different working fluids, research a motion mechanism of the basic electrowetting, and observe dynamic changes of a two-phase interface and a three-phase contact angle state. The method comprises the following specific steps:
(1) Parameters (droplet size, acceleration size, experiment flow chart and the like) are set through a centrifuge rotating platform controller, and instructions are provided for a control unit to start an experiment.
(2) And opening an electromagnetic valve and a micro-injection pump for controlling the basic electrowetting experimental unit, generating a liquid drop with a set size in the basic electrowetting experimental unit through a needle head, and closing the electromagnetic valve and the micro-injection pump.
(3) And turning on a light source, and adjusting the position of the microscopic view field observation camera to enable the liquid drop to be positioned in the center of the camera.
(4) And applying voltage to the basic electrowetting experiment unit, and simultaneously turning on a camera recording switch to record the electrowetting phenomenon.
(5) And after a certain time, closing the voltage of the basic electrowetting experiment unit, and recording the motion process of the liquid drop after the power is removed.
(6) And sending an experiment ending instruction, closing a microcosmic view field observation camera switch, and transmitting the shot video to a centrifuge rotating platform controller through a control unit.
(7) And blowing the liquid drops to one side with the recovery device by using a fan, and sucking the liquid drops into the waste liquid storage tank to finish the recovery of the liquid drops.
Example 2
The embodiment 2 of the invention provides a research method of an electrowetting liquid drop transport experiment based on a centrifuge rotating platform, which can carry out a liquid drop transport experiment aiming at liquid drops with different scales and different working fluids and research a macroscopic rule of liquid drop transport under electrowetting. The method comprises the following specific steps:
(1) Parameters (droplet size, electrode activation time, acceleration (force), experiment flow chart and the like) are set through a centrifuge rotation platform controller, and instructions are provided for a control unit to start an experiment.
(2) An electromagnetic valve and a micro-injection pump for controlling the electrowetting liquid drop transportation experiment unit are started, a liquid drop (the basic diameter of the liquid drop is up to the two electrodes) with a set size is generated in the electrowetting liquid drop transportation experiment unit through a needle (one section of an experiment cavity), and the electromagnetic valve and the micro-injection pump are closed.
(3) And (3) turning on a light source, and adjusting the position of the macroscopic view field observation camera to enable the camera to clearly and completely shoot the electrowetting liquid drop transport experiment unit.
(4) And (3) operating the electrodes (activating and closing) in sequence through an experimental instruction list, and simultaneously turning on a camera recording switch to record the liquid drop transportation process.
(5) The position of the liquid drop is detected through an image processing means, when the liquid drop is transported to another section of the experiment cavity, an experiment ending instruction is sent, a macroscopic view field observation camera switch is closed, and a shot video is transmitted to a centrifugal machine rotating platform controller through a control unit.
(6) And the liquid drops are driven to the sponge of the waste liquid storage tank by controlling the electrode switch, so that the liquid drops are recovered.
Therefore, the experimental research method for the electrowetting based on the centrifuge rotating platform is used for carrying out basic electrowetting experiments and electrowetting liquid drop transport experiments on the centrifuge rotating platform, and is convenient for scientific researchers to research the movement mechanism of basic electrowetting, the macroscopic law of liquid drop transport under electrowetting, observe the dynamic change of the contact state of a two-phase interface and three phases, explain electrocapillary dynamics and the microscopic mechanism of enhanced fluid transport.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A system for conducting electrowetting experimental studies based on a variable force field generated by a centrifuge platform, the system comprising: a centrifuge platform; the centrifuge platform comprises: a drive assembly and a turntable assembly;
an experiment module is placed on the turntable assembly; the experimental module comprises: the device comprises a working medium storage unit, a liquid injector unit, a basic electrowetting experiment unit and an electrowetting liquid drop transport experiment unit;
the driving assembly is used for driving the turntable assembly to rotate and providing a variable force field environment for the experiment unit on the turntable assembly;
the working medium storage unit is used for storing working medium fluid used in an experiment;
the liquid injector unit is used for injecting the working medium fluid in the working medium storage unit into the basic electrowetting experiment unit or/and the electrowetting liquid drop transportation experiment unit;
the basic electrowetting experiment unit is used for carrying out an electrowetting liquid drop driving experiment under a variable force field, namely, liquid drops on the electrode plate are driven to move by changing the amplitude and the waveform of voltage applied to the electrode plate;
the electrowetting liquid drop transport experiment unit is used for carrying out a liquid drop transport experiment under a variable force field, namely, the liquid drop transport is driven by changing the activation sequence of continuous electrodes.
2. The system for conducting electrowetting experimental studies based on the variable force field generated by the centrifuge platform of claim 1, wherein the centrifuge platform further comprises a support assembly; the support assembly includes: the centrifuge control module, the power supply module and the communication module are used for controlling and exchanging data of the whole centrifuge platform and the experiment unit control unit; wherein, the first and the second end of the pipe are connected with each other,
the centrifuge control module is used for controlling the centrifuge platform and comprises the starting, stopping and rotating speed of the turntable assembly; and providing instructions to an experiment module, comprising: starting an experiment, controlling a liquid injector and collecting waste liquid;
the power supply module is used for providing a power supply required by an experiment;
and the communication module is used for communicating with the centrifuge platform and the experiment module and transmitting data and instructions in the experiment process.
3. The system for performing electrowetting experimental study based on the variable force field generated by the centrifuge platform as claimed in claim 2, wherein the control modules and the experimental modules at the left and right ends of the turntable assembly have the same weight, the center of gravity of the two modules are relatively consistent and are equidistant from the center point, i.e. are symmetrically distributed, so as to maintain the balance of the centrifuge platform.
4. The system for conducting electrowetting experimental studies based on a variable force field generated by a centrifuge platform of claim 1, wherein said experimental module further comprises: the device comprises an experiment control unit, an image acquisition unit and a waste liquid collection unit; wherein the content of the first and second substances,
the experiment control unit is used for starting an experiment, controlling the liquid injector unit and the waste liquid collecting unit, adjusting the voltage required in the electrowetting experiment process, exchanging information with the centrifuge platform, and converting the power supply voltage provided by the centrifuge platform into various voltages required by the experiment module;
the image acquisition unit is used for shooting and recording experimental processes of electrowetting liquid drop driving and electrowetting liquid drop transportation;
and the waste liquid collecting unit is used for collecting the liquid drops which are subjected to the experiment after the experiment is finished so as to carry out the experiment of the next liquid drop.
5. The system for conducting electrowetting experimental studies based on a variable force field generated by a centrifuge platform according to claim 4, wherein the experimental control unit comprises: the power supply conversion subunit, the information exchange subunit, the experiment process control subunit and the data acquisition subunit are used for controlling the experiment unit and exchanging data, and are communicated with the control module constructed by the support; wherein the content of the first and second substances,
the power supply conversion subunit is used for respectively converting the voltage provided by the centrifuge platform into the voltage required by the waste liquid collection unit and the voltage required by the experiment control unit;
the information exchange subunit is used for receiving an instruction of the centrifuge platform and transmitting experimental data to the experimental module;
the experimental process control subunit is used for controlling the whole experimental process, and comprises: starting an experimental process, controlling a liquid injector to inject liquid, controlling a camera to start photographing, outputting and adjusting voltage applied to working medium liquid drops in an electrowetting process, controlling the whole experimental process of electrowetting liquid drop driving and liquid drop transportation and waste liquid drop collection;
the data acquisition subunit is used for acquiring data in the experimental process, including temperature data, pressure data and process control data.
6. The system for conducting electrowetting experimental studies based on the variable force field generated by the centrifuge platform as claimed in claim 4, wherein the image acquisition unit comprises a light source, a micro field of view observation camera and a macro field of view observation camera; wherein the content of the first and second substances,
the light source is used for providing illumination for the basic electrowetting experiment unit and the electrowetting liquid drop transportation experiment unit so that the camera can clearly shoot and record the experiment process;
the microscopic view field observation camera comprises a multi-azimuth microscopic camera and is used for clearly shooting and recording the electrowetting liquid drop driving experiment in multiple azimuth directions;
the macroscopic view field observation camera comprises a multi-azimuth macroscopic camera and is used for performing macroscopic shooting and recording of an electrowetting liquid drop transport experiment in multiple azimuth.
7. The system for conducting electrowetting experimental studies based on the variable force field generated by the centrifuge platform as claimed in claim 4, wherein the waste liquid collection unit comprises a waste liquid storage tank, a sponge and a fan; wherein the content of the first and second substances,
the waste liquid storage tank is used for storing liquid drops after an electrowetting liquid drop driving experiment and an electrowetting liquid drop transport experiment are finished, so that pollution is prevented;
the sponge is used for adsorbing the waste liquid drops after an electrowetting liquid drop driving experiment and an electrowetting liquid drop conveying experiment so that the liquid drops smoothly enter the waste liquid storage tank;
the fan is used for blowing the liquid drops in the basic electrowetting experiment unit to the adsorption sponge; the droplets of the electrowetting droplet transport experimental unit are driven onto the adsorption sponge by means of an activated electrode switch.
8. The system for performing electrowetting-based experimental study on a variable force field generated by a centrifuge platform of claim 1, wherein the basic electrowetting experimental unit comprises: the device comprises a first transparent experimental cavity, a first experimental table, a first bottom substrate and liquid drops; wherein the content of the first and second substances,
the first experiment table is used for providing an experiment environment for an electrowetting liquid drop driving experiment;
the first bottom substrate comprises a first substrate, an electrode layer, a first dielectric layer and a first hydrophobic layer, is used for containing liquid drops required by an experiment and provides driving force for the movement of the liquid drops;
when an electrowetting liquid drop driving experiment is carried out, the liquid drop and the bottom substrate form a potential difference to generate an electrowetting effect.
9. The system for conducting electrowetting experimental studies based on a variable force field generated by a centrifuge platform of claim 1, wherein the electrowetting droplet transport experimental unit comprises: a second transparent experimental cavity, a second experimental bench, a second bottom substrate and liquid drops; wherein the content of the first and second substances,
the second experiment table is used for providing an experiment environment for the electrowetting liquid drop transport experiment;
the second bottom substrate comprises a second substrate, a plurality of dressing electrodes, a second dielectric layer and a second hydrophobic layer, and the second bottom substrate is used for providing driving force for liquid drop transportation by controlling the switch of the adjacent electrodes;
when an electrowetting liquid drop transportation experiment is carried out, the liquid drop is placed on the second bottom substrate, the base diameter of the liquid drop is at least positioned on the two electrodes, and the liquid drop is transported from one section of the second transparent experiment cavity to the other section.
10. The system for conducting electrowetting experimental studies based on the variable force field generated by the centrifuge platform according to claim 8 or 9, wherein the injector unit comprises: a micro-injection pump, an electromagnetic valve and a needle head; wherein, the first and the second end of the pipe are connected with each other,
the micro-injection pump is connected with the working medium storage unit and is used for injecting the working medium liquid in the working medium storage unit into the basic electrowetting experiment unit or/and the electrowetting liquid drop transportation experiment unit;
the electromagnetic valve is used for controlling whether to inject liquid into the basic electrowetting experiment unit or/and the electrowetting liquid drop transportation experiment unit and the volume of the injected liquid; before the experiment starts, the electromagnetic valve is opened for a certain time, and a certain amount of liquid is injected into the basic electrowetting experiment unit or/and the electrowetting liquid drop transport experiment unit; after liquid injection is finished, closing the electromagnetic valve switch;
the needle head is positioned in the bottom substrate of the experiment cavity and used for injecting the liquid provided by the working medium storage unit into the bottom substrate of the experiment cavity in the form of liquid drops.
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