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Microstructure device adopting series amplification

A series structure and microstructure technology, applied in the direction of mixers, dissolution, chemical instruments and methods, etc., can solve the problems of poor operation stability, complex fluid flow distribution, and high requirements for the manufacturing process of parallel devices, so that it is not easy to block and make The effect of convenience and simple structure

Active Publication Date: 2015-11-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the parallel device has high requirements on the manufacturing process, the fluid flow distribution is more complicated, and the operation stability is poor. Both basic research and industrial practice urgently need a more efficient and controllable large-scale preparation method of monodisperse micro-sized droplets and bubbles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Polymethyl methacrylate (PMMA) is used as the material of the microchannel substrate 1. The width and depth of the main channel 3 are both 750 microns, and the width and depth of the bypass channel 4 are both 750 microns. The main channel 3 and the bypass channel 4 are rectangular channels. The radial width of the constriction is 200 microns, and the main channel 3 has ten stages of constriction, and the constriction interval is 1500 microns. A flat quartz capillary with an outer diameter of 750 microns and an inner diameter of 530 microns is embedded in the bypass channel 4 , and the front end is flush with the upper side wall of the upstream main channel 3 . channel structure like figure 1 As shown, both sides of the main channel 3 adopt the dispersed phase injection method ( figure 1 upper structure).

[0029] The continuous phase was injected using Teflon tubing and the two-phase fluid was collected. Add sodium dodecyl sulfate sodium sulfate (SDS, 0.01wt%-2wt%) ...

Embodiment 2

[0031] Stainless steel is used as the material of the microchannel substrate 1. The width and depth of the main channel 3 are both 300 microns, and the width and depth of the bypass channel 4 are both 300 microns. Both the main channel 3 and the bypass channel 4 are rectangular channels. The radial width of the constriction is 10 microns, and the main channel 3 has ten stages of constriction at intervals of 500 microns. A flat stainless steel capillary with an outer diameter of 300 μm and an inner diameter of 50 μm is embedded in the bypass channel 4 , and the front end of the capillary is flush with the upper side wall of the upstream main channel 3 . channel structure like image 3 As shown, the upper side of the main channel 3 adopts the mode of direct injection to inject the dispersed phase into the main channel 3 ( image 3 upper structure).

[0032] The continuous phase was injected using Teflon tubing and the two-phase fluid was collected. Add sodium dodecyl sulfate ...

Embodiment 3

[0034] Using polytetrafluoroethylene as the material of the microchannel substrate 1, the width and depth of the main channel 3 are both 1300 microns, the width and depth of the bypass channel 4 are both 1300 microns, and both the main channel 3 and the bypass channel 4 are rectangular channels . The radial width of the constriction is 300 microns, and the main channel 3 has ten stages of constriction at intervals of 5000 microns. A stainless steel capillary with an outer diameter of 1300 μm and an inner diameter of 1000 μm is embedded in the bypass channel 4 , and the front end of the capillary is flush with the upper side wall of the upstream main channel 3 . channel structure like image 3 As shown, the upper side of the main channel 3 adopts the mode of direct injection to inject the dispersed phase into the main channel ( image 3 upper structure).

[0035] The continuous phase was injected using Teflon tubing and the two-phase fluid was collected. Add sodium dodecyl ...

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Abstract

The invention belongs to the technical field of multi-phase fluid micro-dispersion, and particularly relates to a microstructure device adopting series amplification. The microstructure device comprises a micro-channel substrate, a main channel and bypass channels, wherein the main channel is arranged on the micro-channel substrate, and the bypass channels are arranged on one or two sides of the main channel and are perpendicular to the main channel; capillary tubes are embedded in the bypass channels and throats are formed at junctions of the capillary tubes and the main channel; a continuous-phase fluid inlet tube is arranged at an upstream inlet of the main channel and a two-phase fluid outlet tube is arranged at a downstream outlet. The formed microstructure device adopting series amplification realizes scale amplification of the droplet and bubble breaking process under the jetting flow pattern and is simple in structure, convenient to manufacture and not easy to block, the mono-dispersed droplet and bubble generation frequency is substantially increased, and the microstructure device can be well applied to gas-liquid and liquid-liquid systems.

Description

technical field [0001] The invention belongs to the technical field of microdispersion of multiphase fluids, and in particular relates to a series-amplified microstructure device. Background technique [0002] Monodisperse micro-sized droplets and bubbles are widely used in chemical industries such as food, biological detection, pharmaceutical and cosmetics. In the traditional process, the size distribution of droplets and bubbles obtained by using heterogeneous shear flow is wide, and the energy loss is serious, which is difficult to control and use efficiently. In recent years, microstructured devices with a characteristic size below 1 mm have attracted people's attention. The controllable preparation of monodisperse micro-sized droplets and bubbles can be realized in the microstructured device, which facilitates the regulation of the complex structure of droplets and bubbles. However, at the present stage, microfluidics, especially multiphase fluid microdispersion techno...

Claims

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Application Information

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IPC IPC(8): B01F13/00
Inventor 骆广生李严凯王凯徐建鸿
Owner TSINGHUA UNIV
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