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A method for regulating the charge quantity and charge properties of droplets

A charged quantity and droplet technology, applied in the measurement of electrical variables, measuring devices, material analysis by electromagnetic means, etc., can solve the problems of complicated operation, difficult to accurately control the charged quantity and type of droplets, etc., to achieve easy operation, low cost effect

Active Publication Date: 2021-12-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems that the existing droplet charging method needs to use high-voltage power supply for charging, the operation is complicated, or it is difficult to accurately control the charge amount and charge type of the droplet

Method used

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  • A method for regulating the charge quantity and charge properties of droplets
  • A method for regulating the charge quantity and charge properties of droplets
  • A method for regulating the charge quantity and charge properties of droplets

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for regulating the charge and charge properties of droplets, comprising the following steps:

[0032] (1) Clean a glass sheet with a thickness of 170 μm, and place it on a candle flame to accumulate carbon particles until it is evenly deposited on the glass sheet;

[0033] (2) Transfer 4mL tetraethyl orthosilicate and 4mL ammonia water into two small beakers respectively, put the two beakers and glass slides into a closed desiccator, vacuumize to -0.1Mpa, and carry out chemical vapor phase for 24 hours deposition, resulting in SiO 2 . The glass sheet was sintered at 520° C. for 2 hours in a muffle furnace to obtain a transparent silicon dioxide layer and maintain its original micro-nano structure, that is, a super-amphiphobic substrate.

[0034] (3) Place the syringe on a programmable syringe pump (Pump 11Elite, Harvard), fix the needle on an adjustable iron stand, the position of the needle is directly above the super-amphiphobic substrate, and then measure ...

Embodiment 2

[0036] A method for regulating the charge and charge properties of droplets, comprising the following steps:

[0037] (1) Clean a glass sheet with a thickness of 170 μm, and place it on a candle flame to accumulate carbon particles until it is evenly deposited on the glass sheet;

[0038] (2) Transfer 4mL tetraethyl orthosilicate and 4mL ammonia water into two small beakers respectively, put the two beakers and glass slides into a closed desiccator, vacuumize to -0.1Mpa, and carry out chemical vapor phase for 24 hours deposition, resulting in SiO 2 . The glass sheet was sintered at 520° C. for 2 hours in a muffle furnace to obtain a transparent silicon dioxide layer and maintain its original micro-nano structure, that is, a super-amphiphobic substrate.

[0039] (3) After the droplets roll / slide on the surface of the superamphiphobic / hydrophobic substrate for different lengths (1-10cm), the positive charge will also be affected. For details, see figure 1 b, by figure 1 b It...

Embodiment 3

[0041] A method for regulating the charge and charge properties of droplets, comprising the following steps:

[0042] (1) Clean a glass sheet with a thickness of 170 μm, and place it on a candle flame to accumulate carbon particles until it is evenly deposited on the glass sheet;

[0043] (2) Transfer 4mL tetraethyl orthosilicate and 4mL ammonia water into two small beakers respectively, put the two beakers and glass slides into a closed desiccator, vacuumize to -0.1Mpa, and carry out chemical vapor phase for 24 hours deposition, resulting in SiO 2 . The glass sheet was sintered at 520° C. for 2 hours in a muffle furnace to obtain a transparent silicon dioxide layer and maintain its original micro-nano structure, that is, a super-amphiphobic substrate.

[0044] (3) Eliminate the static electricity of the super-amphiphobic substrate, and then make the droplet hit the substrate 10 times at a place 15 cm directly above the surface of the super-amphiphobic substrate to make the ...

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Abstract

The invention discloses a method for regulating the charge amount and charge properties of droplets. The method includes the following steps: (1) depositing a carbon layer on the surface of the pretreated substrate; (2) continuing to deposit silicon dioxide on the carbon layer and then fluorinating to obtain a super-amphiphobic substrate; (3) then making When the droplets fall on the surface of the superamphiphobic substrate, the charge amount and charge properties of the droplets can be adjusted. The invention provides a method that does not require external energy input, has low cost, is easy to operate, and can precisely control the charge amount and charge type of droplets. The problem of the existing droplet charging method that high-voltage power supply is required for charging, complicated operation or difficulty in accurately controlling the charged amount and charged type of the droplet is solved.

Description

technical field [0001] The invention belongs to the technical field of charged liquid regulation, and in particular relates to a method for regulating and controlling the charging quantity and charging properties of liquid droplets. Background technique [0002] Charged droplets have attracted extensive attention due to their wide range of applications in industry and life, including in metal ion reduction, electrospray ionization technology, inkjet printing, material manufacturing (such as preparing nanoparticles, polymer composites) and biomedicine, etc. field. Micro-nano-sized encapsulation technology uses electrospray to generate monodisperse water droplets. This technology is particularly important for technical fields such as food additive encapsulation, targeted drug delivery, and special material processing. [0003] At present, the methods of using an external power source to charge the droplets include: applying an external electric field to charge the droplets; a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/60G01R29/24C03C17/02
CPCG01N27/60G01R29/24C03C17/02C03C2217/213C03C2217/76C03C2218/152C03C2218/32
Inventor 邓旭王迎曦孙强强
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA