16 results about "Contact electrification" patented technology

This invention provides a multilayer polarization-enhanced liquid-solid contact separation triboelectric nanogenerator structure, comprising, from bottom to top: a first electrode layer, a polarization-enhancing dielectric layer, a triboelectric layer, a second electrode layer, and a surface nanoparticle modification layer. Both the first and second electrode layers are made of copper foil and are used to collect charges generated by electrostatic induction. The polarization-enhancing dielectric layer is a PVDF thin film, used to enhance the interfacial charge storage capacity and electric field coupling strength, thereby enhancing the electrostatic induction effect and significantly improving the device's output voltage and current. The triboelectric layer is a FEP thin film, which can acquire electrons upon contact with the droplet. The surface nanoparticle modification layer is composed of PTFE nanoparticles, which adhere to the FEP thin film, further increasing the surface triboelectric charge density and thus improving the output voltage. This invention, through liquid-solid contact electrification and electrostatic induction mechanisms, can efficiently convert the mechanical energy of rainwater into electrical energy to provide power for low-power sensors in rainfall detection.

The subject invention pertains to a comprehensive investigation of leading mechanisms of contact electrification in various liquid-liquid systems and an all-liquid TENG with optimized materials and structures to harvest energy from rainwater. Embodiments of the provided all-liquid TENG can generate a high charge density (e.g., 3.63 μC / L) with high output stability (e.g., crest factor≈1.1) and long effective contact electrification time. In certain embodiments, based on the direct current characteristics, energy harvested from rainwater can be fed directly to electronic devices and a self-powered rainfall sensor can also be implemented. Embodiments of the subject invention provide all-liquid systems useful in applications including distributed green energy, passive sensors, and other self-powered devices.

A sensing device includes a robotic hand, an electrode and a triboelectric sensing layer. The robotic hand includes at least one robot finger. One robot finger is integrated with an electrode layer which is functionalized with a triboelectric sensing layer. The triboelectric sensing layer is composed of plurality of nanostructures including Tellurium. The robot hand with triboelectric sensing layer undergoes contact and separation with the target analyte solution having mercury ions which leads to the formation of mercury telluride owing to the highly selective between of mercury ions to the Tellurium surface. After contacting with the target analyte, the electron transfer ability of the nanostructures attached to robot finger is altered. This process of contact electrification causes the induction of electrons to the electrode layer generating the triboelectric output voltage. The triboelectric output voltage is utilized to determine the concentration of mercury ions in the target analyte solution.

The invention discloses a uranium ore leaching method and a uranium ore leaching device, and relates to the technical field of hydrometallurgy. The invention provides a novel multifunctional uranium leaching system which is characterized in that porous electrode plates and conductive liquid injection pipes are arranged at the two ends of a horizontal rotary reaction cabin, contact electrification is realized by means of an anode wire and a cathode wire, and a uranium trapping net in the horizontal rotary reaction cabin is filled with ion exchange resin; uranyl ions are enriched on the ion exchange resin under the action of an electric field. The uranium ore structure is destroyed through mechanical force, reaction sites are exposed, uranium element oxidation and dissolution are promoted through advanced oxidation, uranyl ion migration is promoted through an electric field, the advanced oxidation reaction efficiency is improved, uranyl ions driven by the electric field are adsorbed through ion exchange resin in real time, and the three forms a synergistic strengthening effect. The acid consumption is obviously reduced; and the leaching efficiency and the recovery rate of uranium are improved.

This invention proposes an innovative vibration sensor based on a triboelectric nanogenerator using an elastic rope element. Leveraging the high sensitivity and low cost of the elastic rope element, it achieves self-powered vibration monitoring. The sensor effectively captures low-frequency and minute vibrations by stretching and relaxing the elastic rope element, combined with the contact electrification effect of the triboelectric nanogenerator, and converts them into electrical signals. Its unique design not only simplifies the structure but also improves the sensor's environmental adaptability, making it particularly suitable for fields such as the Internet of Things and mechanical fault monitoring. The elastic rope element of this invention features small radial dimensions, allows for multiple arrangements in the same plane, has low mass, good water resistance, low cost, and is easy to integrate, bringing a new breakthrough to vibration sensing technology.

A sensing device includes a robotic hand, an electrode and a triboelectric sensing layer. The robotic hand includes at least one robot finger. One robot finger is integrated with an electrode layer which is functionalized with a triboelectric sensing layer. The triboelectric sensing layer is composed of plurality of nanostructures including Tellurium. The robot hand with triboelectric sensing layer undergoes contact and separation with the target analyte solution having mercury ions which leads to the formation of mercury telluride owing to the highly selective between of mercury ions to the Tellurium surface. After contacting with the target analyte, the electron transfer ability of the nanostructures attached to robot finger is altered. This process of contact electrification causes the induction of electrons to the electrode layer generating the triboelectric output voltage. The triboelectric output voltage is utilized to determine the concentration of mercury ions in the target analyte solution.

A self-powering medical implant and sensor ("medical implant / sensor") for electronic-free wireless transmission of data sensed by the medical implant / sensor, comprising an active mechanical metamaterial, comprising first and second electrically conductive components disposed relative to each other to act as opposite electrodes to induce contact electrification; wherein the first and second electrically conductive components, along with a dielectric component serving as a skeleton of the active mechanical metamaterial, form a lattice of snapping curved semicircular-shaped segments, wherein each of the snapping curved semicircular-shaped segments has an elastic snap-through instability mechanism; and wherein the lattice of snapping curved semicircular-shaped segments comprises periodic repeatable parallel rows of the snapping curved semicircular-shaped segments.

A method for improving the efficiency of a water electrolysis system and a system therefor are disclosed. The system includes a stack, a power source configured to supply a voltage to an anode and a cathode of the stack, and a contact electrification pipe connected to the anode such that a fluid circulates within the pipe. The fluid includes at least water. Electric power generated in the contact electrification pipe is supplied to the power source to improve power efficiency.

The application relates to a non-contact electrification detection method and device, computer equipment, a medium and a product. The method is applied to a resistance-capacitance coupling detection device and comprises the following steps: erecting the resistance-capacitance coupling detection device in a preset range of a measured conductor, collecting a time-domain voltage signal of the measured conductor, and converting the time-domain voltage signal into an initial frequency-domain signal; obtaining voltage compensation parameters based on a resistance-capacitance coupling voltage division model corresponding to the resistance-capacitance coupling detection device; the voltage compensation parameters comprise amplitude compensation parameters and phase compensation parameters; the resistance-capacitance coupling voltage division model comprises an equivalent resistance of an insulating layer of the measured conductor; compensating each frequency component of the initial frequency-domain signal based on the amplitude compensation parameters and the phase compensation parameters, and determining target amplitudes and target phases of each harmonic component of the measured conductor. The method can reduce the detection error of voltage harmonics and improve the detection accuracy of each harmonic component by considering the equivalent resistance of the insulating layer of the measured conductor.

The invention provides a process for enhancing self-recovery mechanoluminescence of fluorescent powder based on a contact electrification principle, which comprises the following steps: S1, filtering the fluorescent powder through a 100-200-mesh screen to remove agglomerated particles; the invention provides a process for enhancing self-recovery mechanoluminescence of fluorescent powder based on a contact electrification principle, which comprises the following steps: through a mixing and sintering process, by utilizing an interface diffusion effect in the sintering process, enabling an active binary compound and inert fluorescent powder to form tight and uniform interface bonding, and the bonding state is to improve the contact electrification efficiency, so that the self-recovery mechanoluminescence of the fluorescent powder is enhanced. The active material and the fluorescent powder realize'gapless' interface contact, so that the stability and maximization of charge transfer under mechanical stress are ensured, a polarization electric field caused by a contact electrification effect can be greatly enhanced, a luminescence center is effectively excited, and the self-recovery mechanoluminescence intensity and stability are remarkably improved; and the problem of insufficient contact electrification capability caused by pure mixing is fundamentally solved.

The invention provides a flexible composite material with relatively strong self-recovery mechanoluminescence characteristic and a preparation method thereof. The flexible composite material with the relatively strong self-recovery mechanoluminescence characteristic comprises a flexible carrier, a luminescence functional component and alcohol, the flexible carrier is prepared from polydimethylsiloxane, a PDMS (Polydimethylsiloxane)-A solution and a PDMS-B solution. According to the flexible composite material with the high self-recovery mechanoluminescence characteristic and the preparation method thereof, a polarization electric field caused by the contact electrification effect is greatly enhanced, the luminous intensity and stability are remarkably improved, the controllability is high after technological parameters are optimized, the material performance can be precisely regulated and controlled, and the application prospect is wide. And meanwhile, commercial fluorescent powder and a low-cost active material are adopted, the industrialization threshold is reduced, the finally prepared composite material has excellent flexibility, can tolerate deformation such as bending and stretching, has mechanical stability, has no obvious attenuation of luminescence property after deformation, and can adapt to flexible sensing, anti-counterfeiting and other scenes.

The application discloses a stretchable porous fiber fabric for sensing and thermal management and a preparation method thereof. The fabric is woven by coaxial fibers prepared by simple and low-cost wet spinning. The outer shell layer comprises a stretchable polymer matrix and a high dielectric constant doping material; the inner core layer comprises a stretchable polymer matrix and an intrinsic stretchable conductive material LM. Based on the coupling effect of contact electrification and electrostatic induction, with the help of material modification and the porous structure spontaneously endowed by wet spinning, the fabric can realize high-sensitivity self-powered sensing. Meanwhile, compared with traditional polymer electrodes, the fabric can still maintain excellent conductivity in a highly stretchable situation with the help of LM, realizing strain resistance sensing with a wider response range. Moreover, the fabric has sensing function and can be used for personal thermal management. In addition, the integrated coaxial spinning technology ensures that the fabric can be washed multiple times without performance degradation.

The invention discloses a dry powder additive feeding device and method in a particulate matter exposure environment, and belongs to the technical field of feed processing. In order to overcome the defects that an existing liquid additive spraying mode is prone to blockage, uneven in mixing and lagged in regulation and control, a full-dry-method process is adopted, feed particles and additive dry powder are in turbulent collision in a mixing cavity isolated by a dry air curtain so as to be in contact for electrification, and initial adsorption is achieved through electrostatic force; and furthermore, the attachment effect is stabilized by monitoring the surface potential of the feed in real time, regulating and controlling the intensity of a downstream corona discharge field in a closed loop and dynamically compensating charges. According to the system, blockage of the nozzles is completely eradicated, the variable coefficient of mixing uniformity is controlled to be 5% or below, real-time accurate regulation and control of second-level response can be achieved, the system adapts to humidity fluctuation of the actual breeding environment, and the utilization efficiency and feeding accuracy of additives are remarkably improved.

The invention relates to the technical field of algae bloom control, in particular to a device and a method for inactivating blue-green algae. The device comprises a driving mechanism and an impeller connected with the driving mechanism, and the driving mechanism is used for driving the impeller to rotate; the preparation material of the impeller is different from the electron gaining and losing capacity of water, so that when the impeller rotates in the water, the impeller makes contact with the water to generate an electrification effect and generate reactive oxygen species, and the reactive oxygen species can cause damage or death of the blue-green algae. The device is ingenious in design, the contact electrification effect can be triggered through high-speed turbulence shearing, efficient and low-energy-consumption removal of algae can be achieved, harmful substances cannot be generated in the blue-green algae inactivation process, and high efficiency, environmental safety and economic feasibility can be taken into consideration.

The invention discloses a polymer-based piezoelectric composite material and a design method and a preparation method thereof. According to the design method, the piezoelectric effect is achieved through charge transfer behaviors between high polymer materials with different contact electrification characteristics, wherein the contact electrification characteristics specifically refer to electrostatic sequences. The polymer-based piezoelectric composite material comprises a plurality of high polymer materials with different contact electrification characteristics, and two adjacent high polymer materials have different contact electrification characteristics. The piezoelectric response of the polymer-based piezoelectric composite material provided by the invention is derived from a material interface effect instead of crystal intrinsic polarity, so that the components are not required to have a non-centrosymmetric structure. The material selection range is greatly widened, and various conventional polymers are allowed to be flexibly selected according to mechanical, environmental or cost requirements.