Micro-structural device for preparing mono-dispersed liquid drops and bubbles and use method of micro-structural device

A microstructure, monodisperse technology, applied in chemical instruments and methods, dissolution, mixers, etc., can solve the problems of complex hydraulic focusing channel fabrication, difficult stable operation, instability and other problems, and achieve simple structure, easy adjustment, Ease of mass production

Active Publication Date: 2015-07-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fabrication of hydraulic focusing channels is complex and costly, and the jetting flow pattern formed in a symmetrical flow field is affected by hydraulic instability, making it difficult to achieve stable operation in a wide range

Method used

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  • Micro-structural device for preparing mono-dispersed liquid drops and bubbles and use method of micro-structural device
  • Micro-structural device for preparing mono-dispersed liquid drops and bubbles and use method of micro-structural device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The width of the main channel wide-diameter area of ​​PMMA is 1200 microns, the downstream width is 750 microns, and the bypass channel width is 750 microns. Both the main channel and the bypass channel are square grooves with a depth of 750 microns. A flat-headed quartz capillary with a diameter of 750 μm and an inner diameter of 530 μm is inserted into the bypass channel and extends to the side of the main channel, with a length of 520 μm. Use a PTFE hose to inject the continuous phase and collect the two-phase fluid. Add sodium dodecyl sulfate (SDS, the mass fraction in the continuous phase is 0.01wt% ~ 2wt%) or cetyltrimethylammonium bromide (CTAB, the mass fraction in the continuous phase is 0.01wt% ~2wt%) and other water-soluble surfactants as the continuous phase, adding different mass concentrations of glycerin (the mass fraction in the continuous phase is 1wt% to 70wt%) to adjust the continuous phase viscosity, the continuous phase viscosity is 1mPa·s ~500mPa·s...

Embodiment 2

[0044] The wide-diameter area of ​​the main channel with stainless steel as the substrate has a width of 1400 microns, a downstream width of 750 microns, and a bypass channel width of 540 microns. Both the main channel and the bypass channel are square grooves with a depth of 540 microns. A stainless steel capillary tube with an outer diameter of 540 microns and an inner diameter of 310 microns is inserted into the bypass channel and extends to the side of the main channel, with a length of 520 microns. Use a PTFE hose to inject the continuous phase and collect the two-phase fluid. Add sodium dodecyl sulfate (SDS, the mass fraction in the continuous phase is 0.01wt% ~ 2wt%) or cetyltrimethylammonium bromide (CTAB, the mass fraction in the continuous phase is 0.01wt% ~2wt%) and other water-soluble surfactants as the continuous phase, adding different mass concentrations of glycerin (the mass fraction in the continuous phase is 1wt% to 70wt%) to adjust the continuous phase viscos...

Embodiment 3

[0046] The width of the wide-diameter area of ​​the main channel with PTFE as the substrate is 1400 microns, the width of the narrow-diameter area is 750 microns, and the width of the bypass channel is 540 microns. Both the main channel and the bypass channel are square grooves with equal depth. It is 540 microns, and a stainless steel capillary with an outer diameter of 540 microns and an inner diameter of 310 microns is inserted into the bypass channel and extends to the side of the main channel, with a length of 520 microns. Use a PTFE hose to inject the continuous phase and collect the two-phase fluid. Add sodium dodecyl sulfate (SDS, the mass fraction in the continuous phase is 0.01wt% ~ 2wt%) or cetyltrimethylammonium bromide (CTAB, the mass fraction in the continuous phase is 0.01wt% ~2wt%) and other water-soluble surfactants as the continuous phase, adding different mass concentrations of glycerin (the mass fraction in the continuous phase is 1wt% to 70wt%) to adjust th...

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Abstract

The invention belongs to the technical field of fluid micro-dispersion and particularly relates to a micro-structural device for preparing mono-dispersed liquid drops and bubbles and a use method of the micro-structural device. The micro-structural device comprises a substrate, a cover plate and a capillary tube, wherein a step-shaped groove is formed in the substrate; the capillary tube is embedded into the upper half part of the groove, and dispersed phase liquid / air enters a main channel through the capillary tube; a continuous phase is in contact with a dispersed phase at a reducing position of the step structure, and the dispersed phase is sheared into the mono-dispersed bubbles and liquid drops. The micro-structural device is simple in structure, convenient to produce, less prone to blockage and large in operation range, and is not influenced by wettability of the channel; by setting parameters such as two-phase flow, the mono-dispersed liquid drops and bubbles of required sizes can be rapidly and accurately acquired; the micro-structural device is particularly applicable to the preparation of the mono-dispersed liquid drops and bubbles of 1-1000 microns and has good application prospects in fundamental research and practical industry.

Description

Technical field [0001] The invention belongs to the technical field of fluid microdispersion, and particularly relates to a microstructure device for preparing monodisperse droplets and bubbles and a method of use thereof. Background technique [0002] Monodisperse droplets and bubbles have a wide range of applications in the food, pharmaceutical, cosmetic and other chemical industries. In the traditional process, the droplet and bubble size distribution obtained by using the heterogeneous shear flow is relatively wide, which is difficult to use efficiently. In the past two decades, the development of microchannel processing technology and microflow research has provided new tools for basic research in chemistry, physics, and biology, and has also built a new platform for the preparation of new materials. Researchers have prepared monodisperse droplets and bubbles of different sizes based on different channel structures. However, in the current work, the formation of smaller-si...

Claims

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Application Information

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