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Paper-based micro-flow switch controlled by surface acoustic wave

A surface acoustic wave, micro-based technology, applied in laboratory containers, laboratory utensils, chemical instruments and methods, etc., can solve problems such as unfavorable micro-flow automatic analysis

Inactive Publication Date: 2013-12-25
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because it requires external mechanical force to control the closure of the switch, it is not conducive to automatic analysis of microflow

Method used

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  • Paper-based micro-flow switch controlled by surface acoustic wave
  • Paper-based micro-flow switch controlled by surface acoustic wave

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] A surface acoustic wave controlled paper-based microfluidic switch proposed by the present invention, as shown in the figure, mainly includes a signal generating device 1 and a piezoelectric substrate 2, the upper surface of the piezoelectric substrate 2 is a working surface, and the piezoelectric On the working surface of the substrate 2, there are two IDTs 3 used to excite surface acoustic waves and two IDTs 3 used to reflect the surface acoustic waves excited by the existing microelectronics process. A reflective grid 4 that reduces the power of the RF signal, the two interdigital transducers 3 have the same size and are located on both side edge regions of the symmetrical working surface of the piezoelectric substrate 2, and the position of the reflective grid 4 is closer to the piezoelectric substrate. side of piece 2. A switch as...

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Abstract

The invention discloses a paper-based micro-flow switch controlled by surface acoustic wave; surface acoustic wave which is excited by an interdigital transducer is used for radiating micro-droplets on a drainage layer, so that the micro-droplets deform and become higher; after becoming higher, the micro-droplets are contacted with the bottommost end of an unfolded part of a folded paper-based micro channel and are absorbed by the folded paper-based micro channel; the micro-droplets are conveyed in the folded paper-based micro channel; when the micro-droplets are conveyed to a folded corner of the folded paper-based micro channel, the folded corner is increased, so that the height of the folded paper-based micro channel is changed, a first folded part of the folded part of the folded paper-based micro channel is connected with a first paper-based micro channel and a second paper-based micro channel, and micro fluid in the first paper-based micro channel passes through the first folded part of the folded part and flows into the second paper-based micro channel. The method for controlling the on and the off of the paper-based micro-flow switch through the changes of the height of the micro-droplets conveniently realizes the programmability of the paper-based micro-flow switch, and simultaneously greatly expands the scope of application of a piezoelectric micro-flow control chip.

Description

technical field [0001] The invention relates to a microfluidic switch in a microfluidic chip, in particular to a paper-based microfluidic switch controlled by surface acoustic waves. Background technique [0002] Microfluidic chips are a new interdisciplinary field, based on analytical chemistry, relying on micro-electromechanical processing technology, characterized by micro-pipeline networks, and taking life science as the current main application object. focus of development. The goal of the microfluidic chip is to integrate the functions of the entire laboratory, including sampling, dilution, reagent addition, reaction, separation, detection, etc. To the overall miniaturization, automation, integration and portability of detection, to replace traditional laboratory work. The microfluidic chip has the advantages of controllable liquid flow, minimal consumption of samples and reagents, and greatly improved analysis speed. It can not only greatly reduce the consumption o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01L3/00
Inventor 章安良张悦高挺胡楚黄昶黄孝圣査燕尉一卿韩庆江
Owner NINGBO UNIV
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