Controllable micro-nano electrostatic signal generating device based on liquid drop reciprocating motion

Abstract

The invention discloses a controllable micro-nano electrostatic signal generating device based on liquid drop reciprocating motion. The device utilizes a beam expander and a mask plate to control a laser irradiation area, and utilizes a photovoltaic electric field generated by lithium niobate and a solid-liquid friction electrification phenomenon to realize reciprocating motion of charged liquid drops. And the charged liquid drop triggers a periodic micro-nano electrostatic signal on the metal probe through electrostatic induction in a reciprocating motion state. In the operation process of the device, the size and the motion state of liquid drops are monitored in real time through the two cameras, so that the accuracy and the stability of generation of induction electric signals are ensured. By adjusting the reciprocating motion state of liquid drops, induction electric signals with different frequencies and intensities can be flexibly regulated and output, the generation efficiency and reliability of micro-nano electrostatic signals are improved, and efficient utilization of electrostatic induction electric signals is achieved; the method is expected to play an important role in the fields of simulation of bioelectricity signal transmission and related bioelectricity research.

Description

Technical field:

[0001] The invention belongs to the field of micro-nano electrostatic signal generation, and designs a controllable micro-nano electrostatic signal generation device based on the reciprocating motion of droplets. Background technology:

[0002] In modern droplet microfluidics, charged droplets not only have important applications in fluid manipulation, but their charge characteristics also provide new possibilities for the generation of electrostatic signals. Charged droplets interact with the surrounding environment through electrostatic induction, which can trigger micro-nano electrostatic signals on metal probes. However, current technologies have not yet effectively utilized the electrical signals generated by electrostatic induction of charged droplets.

[0003] To this end, a controllable micro-nano electrostatic signal generator based on the reciprocating motion of droplets was developed, which can utilize the charge characteristics of droplets to make them reciprocate through droplet microfluidics, thereby inducing periodic changes in the induced electrical signal on the metal probe. This innovation not only improves the generation efficiency and reliability of micro-nano electrostatic signals, but also realizes the efficient use of electrostatic induced electrical signals, and is expected to play an important role in the simulation of bioelectric signal transmission and related bioelectric research fields. Summary of the invention:

[0004] In order to achieve effective utilization of droplet electrical signals, the present invention provides a micro-nano electrical signal generating device based on the principle of droplet electrostatic induction. The device uses a beam expander and a mask to control the laser irradiation area, and uses the photovoltaic electric field generated by lithium niobate and the solid-liquid friction charging phenomenon to achieve the reciprocating motion of the droplets. The charged droplets induce periodic micro-nano electrostatic signals on the metal probe through electrostatic induction in the reciprocating motion state. Two cameras monitor the size and motion state of the droplets in real time to ensure the accuracy and stability of the induced electrical signals. The present invention can flexibly control the output of induced electrical signals of different frequencies and intensities by adjusting the reciprocating motion state of the droplets. It has broad application prospects and achieves effective utilization of induced electrostatic signals.

[0005] The technical solution of the present invention is:

[0006] A controllable micro-nano electrostatic signal generating device based on reciprocating motion of a droplet, comprising a laser source, a beam expander, a mask, a linear motor, a syringe, a top-view camera, a metal probe, a side-view camera, a super-hydrophobic film, a lithium niobate crystal and a device bracket;

[0007] The laser source comprises a semiconductor laser;

[0008] The syringe comprises a plastic syringe;

[0009] The metal probe comprises a noble metal probe;

[0010] The top-view camera and the side-view camera include high-speed cameras;

[0011] The super hydrophobic film comprises a fluorine-containing super hydrophobic film;

[0012] The device bracket comprises a rotatable device bracket.

[0013] The beneficial effects of the present invention are:

[0014] The present invention can adjust the reciprocating motion state of the droplets according to demand, thereby realizing flexible output of micro-nano electrical signals. The reciprocating motion of the charged droplets is realized through the photovoltaic electric field generated by lithium niobate and the solid-liquid friction charging phenomenon, which significantly improves the repeatability of the reciprocating motion and further improves the stability of the induced electrical signal output. The high-speed camera monitors the size and motion state of the droplets in real time to ensure the consistency of the induced electrical signal output. The design of the device fully considers the integration and fixation of each component, provides a stable operating environment, and effectively improves the gain effect of the electrical signal. This innovation not only improves the generation efficiency and reliability of micro-nano electrostatic signals, but also realizes the efficient use of electrostatic induced electrical signals, and is expected to play an important role in simulating bioelectric signal transmission and related bioelectric research fields. Description of the drawings:

[0015] Figure 1 A schematic structural diagram of a controllable micro-nano electrostatic signal generating device based on the reciprocating motion of a droplet according to the present invention;

[0016] Figure 2 Functional schematic diagram of the bracket of the device of the present invention;

[0017] Figure 3 Schematic diagram of one-dimensional linear reciprocating motion of a droplet;

[0018] Figure 4 The ammeter records the periodic changes of the induced electrical signal on the metal probe. Specific implementation method:

[0019] The present invention will be further described below in conjunction with the embodiments and drawings.

[0020] like Figure 1 , which is a schematic diagram of a controllable micro-nano electrostatic signal generating device based on the reciprocating motion of a droplet. It mainly includes: a laser source 1, a beam expander 2, a mask 3, a linear motor 4, a syringe 5, a top-view camera 6, a metal probe 7, a side-view camera 8, a super-hydrophobic film 9, a lithium niobate crystal 10, and a device bracket 11.

[0021] The laser source 1 comprises a semiconductor laser;

[0022] The beam expander 2 expands the diameter of the laser beam to reduce the divergence angle of the beam, thereby improving the focusing ability and irradiation uniformity of the laser;

[0023] The mask 3 is used to adjust the spot shape of the laser irradiation, so as to control the irradiation area of ​​the laser on the droplet;

[0024] The linear motor 4 is used to accurately control the generation and release of droplets, thereby adjusting the volume of droplets and ensuring stable output of droplets under different experimental conditions;

[0025] The syringe 5 comprises a plastic syringe, which effectively avoids interference with the electrostatic signal induced by the metal probe;

[0026] The top view camera 6 and the side view camera 8 include high-speed cameras, which monitor the size and movement of the droplets in real time from the top view and the side view to ensure the consistency and stability of the induced electrical signal generation process;

[0027] The metal probe 7 includes a noble metal probe, which has excellent electrical conductivity and can effectively capture and conduct the induced electrical signal generated during the movement of the droplet to ensure the accuracy of the signal;

[0028] The super hydrophobic film 9 includes a fluorine-containing super hydrophobic film, which can significantly increase the charge of the droplets and utilize the accumulation of the charge of the droplets;

[0029] The lithium niobate crystal 10 generates a photovoltaic electrostatic field under the illumination of a laser beam, and the photovoltaic electrostatic field exerts a Coulomb electrostatic force on the droplet, driving the droplet to perform a reciprocating motion;

[0030] The device bracket 11 comprises a rotatable device bracket, such as Figure 2 It is a functional schematic diagram of the device bracket 11. By changing the position of the side-view camera 8, a flexible camera angle can be provided and adjusted according to experimental requirements to facilitate observation.

[0031] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. However, the following embodiments are limited to explaining the present invention, and the protection scope of the present invention should include the entire contents of the claims, and through the description of the following embodiments, those skilled in the art can fully implement the entire contents of the claims of the present invention.

[0032] Example 1

[0033] This embodiment uses the controllable micro-nano electrostatic signal generating device based on the reciprocating motion of droplets described above to generate and monitor droplet electrical signals.

[0034] Specific steps:

[0035] (1) Device preparation: Turn on the laser source 1 and expand the diameter of the laser beam through the beam expander 2 to ensure uniform laser irradiation. Place a mask 3 above the beam expander 2 to adjust the shape of the laser spot irradiated on the lithium niobate crystal 10. The lithium niobate crystal 10 generates an electrostatic field in the laser beam irradiated part and tends to a steady state;

[0036] (2) Droplet generation: by controlling the movement of the linear motor 4, the droplets in the syringe 5 flow out, thereby forming charged droplets, and making them stationary on the super-hydrophobic film 9;

[0037] (3) Control the reciprocating motion of droplets: Figure 3 The schematic diagram of the one-dimensional linear reciprocating motion of the droplet is shown in FIG. The photovoltaic electrostatic field generated by the lithium niobate crystal 10 is used to apply the Coulomb electrostatic force to the charged droplet, driving the droplet to perform one-dimensional linear reciprocating motion along a set trajectory. By adjusting the size of the droplet and the irradiation area of ​​the mask 3, the period and trajectory of the reciprocating motion of the droplet can be flexibly controlled;

[0038] (4) Signal monitoring: While the droplet is reciprocating, two high-speed cameras are used to monitor the size and motion state of the droplet in real time to ensure that the droplet moves along the preset trajectory, further ensuring the consistency and stability of the signal generation process. The metal probe 7 is precisely placed at the contact position with the droplet to effectively capture the induced electrical signal generated during the droplet movement;

[0039] (5) Data collection and analysis: Figure 4 , recording the periodic changes of the induced electrical signal on the metal probe 7 through an ammeter, and performing real-time analysis on the signal;

[0040] (6) Result verification: Multiple experiments were performed to verify the stability and reliability of the device to ensure that the reciprocating motion of the droplets and the electrical signals they generate remain consistent under different experimental conditions.

[0041] This example shows that the device can effectively control micro-nano sensing electrical signals and has good stability and repeatability, laying a foundation for further research on bioelectric signal transmission.

[0042] Matters not covered by the present invention are known technologies.

Claims

1. A controllable micro-nano electrostatic signal generating device based on the reciprocating motion of a droplet, characterized in that: The device includes: a laser source, a beam expander, a mask, a linear motor, a syringe, a top-view camera, a metal probe, a side-view camera, a super-hydrophobic film, and a lithium niobate crystal. The components are fixed on a device bracket in sequence and connected to each other to achieve the reciprocating motion of droplets and the generation and collection of electrostatic signals.

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