Preparation method and control method of micro-droplets

A technology of micro droplets and droplets, which is applied in the preparation of microspheres, microcapsule preparations, and the granulation of liquid into bead droplets, etc., can solve the problems of fragility of nozzles, high energy consumption, and high cost, and achieve controllable costs and simple and effective methods. Effect

Active Publication Date: 2020-12-01
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the size of the nozzle to the micron scale not only greatly reduces its mechanical properties, but also makes the nozzle too fragile for practical applications.
Furthermore, the acquisition of microdroplets by external drive mechanisms often results in high ejection velocities, which is undesirable in many cases and requires expensive and complex equipment or high energy consumption.

Method used

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  • Preparation method and control method of micro-droplets
  • Preparation method and control method of micro-droplets
  • Preparation method and control method of micro-droplets

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A controllable micro-droplet generation and manipulation method of the present invention, the schematic diagram of the micro-droplet generation device can be found in figure 2 shown. The device used in this method mainly includes a suspended platform for placing a superamphiphobic surface 4, a needle 1 for generating impacting droplets 2, and a high-speed photographic device for recording the process of producing microdroplets. Among them, the superamphiphobic surface to be impacted in this embodiment is a superamphiphobic surface of silica prepared with candle ash as a template, and thin glass with a thickness of 170 μm is selected as the preparation substrate. The preparation process steps are as follows:

[0031] Move the thin glass back and forth evenly over the burning candle flame to deposit a layer of candle ash, and then place it in a vacuum desiccator with 4ml tetraethyl silicate (TEOS) and 4ml ammonia water in the desiccator, respectively on both sides of th...

Embodiment 2

[0038] A controllable droplet generation and manipulation method of the present invention, embodiment 1 of a droplet generation device. The superamphiphobic surface to be impacted in this example is a silica superamphiphobic surface prepared with candle ash as a template, and thin glass with a thickness of 170 μm is used as the preparation substrate. The preparation process steps are as follows:

[0039] Move the thin glass back and forth evenly over the burning candle flame to deposit a layer of candle ash, and then place it in a vacuum desiccator with 4ml tetraethyl silicate (TEOS) and 4ml ammonia water in the desiccator, respectively on both sides of the sample. After the desiccator was sealed and evacuated, it was deposited by vapor phase deposition for 20 hours to obtain a composite surface filled with candle ash carbon particles and silicon dioxide particles. The sample was then placed in a muffle furnace for annealing at a high temperature of 540°C for 4 hours to remov...

Embodiment 3

[0046] A controllable droplet generation and manipulation method of the present invention, embodiment 1 of a droplet generation device. The superamphiphobic surface to be impacted in this example is a silica superamphiphobic surface prepared with candle ash as a template, and thin glass with a thickness of 170 μm is used as the preparation substrate. The preparation process steps are as follows:

[0047] Move the thin glass back and forth evenly over the burning candle flame to deposit a layer of candle ash, and then place it in a vacuum desiccator with 4ml tetraethyl silicate (TEOS) and 4ml ammonia water in the desiccator, respectively on both sides of the sample. After the desiccator was sealed and evacuated, it was deposited by vapor phase deposition for 20 hours to obtain a composite surface filled with candle ash carbon particles and silicon dioxide particles. The sample was then placed in a muffle furnace and annealed at a high temperature of 560°C for 2 hours to remove...

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Abstract

The invention discloses a preparation method and control method of micro-droplets. When the micro-droplets are prepared, the super-amphiphobic surface is firstly prepared, then, micro-droplets with different sizes can be formed on the super-amphiphobic surface by adjusting the suspension height and the inclination angle of the super-amphiphobic surface and the impact speed of the droplets on the super-amphiphobic surface, then a control part with negative electricity is used for being close to the micro-droplets, and under the interaction of charges, grabbing and control over the micro-droplets are achieved. Different from the prior art, the method provided by the invention does not need any additional complex equipment or driving mechanism, can obtain micron-to-millimeter level controllable liquid drops only through the impact of the liquid drops on the super-amphiphobic surface, and can realize lossless control of the liquid drops. The method is simple, convenient and effective, andan effective candidate method is provided for generation and control application of the micro-droplets.

Description

technical field [0001] The invention belongs to the technical field of micro-droplet preparation, and in particular relates to a method for preparing and manipulating micro-droplets. Background technique [0002] As an excellent micro-carrier, micro-droplets have a wide range of applications in the fields of micro-nano technology and biochemical technology such as inkjet printing, biological detection, and microchemical reactors. However, despite their high potential for scientific and industrial applications, microdroplets are often tedious and difficult to generate and manipulate. So far, micro-nanofluidic technologies for generating tiny droplets usually include closed components such as channels, nozzles or needles. The use of closed components will greatly limit the generation of smaller micro-droplets. To obtain smaller micro-droplets, it is necessary to greatly reduce the size of the nozzle or use additional driving mechanisms such as thermal jets, electric fields, e...

Claims

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Application Information

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IPC IPC(8): B01J2/02B01J13/02B01J13/04
CPCB01J2/02B01J13/02B01J13/04
Inventor 邓旭于凡斐孙强强杨金龙
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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