Virtual impactor and particle separation and concentration detecting device and method based on 3D printing technology

A concentration detector and 3D printing technology, which is applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve problems such as increasing pressure difference, and achieve the effects of maintaining calibration, working stably, and high resolution

Inactive Publication Date: 2016-06-08
ZHEJIANG UNIV
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  • Virtual impactor and particle separation and concentration detecting device and method based on 3D printing technology
  • Virtual impactor and particle separation and concentration detecting device and method based on 3D printing technology
  • Virtual impactor and particle separation and concentration detecting device and method based on 3D printing technology

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[0048] Example

[0049] In this embodiment, the cigarette smoke environment is used as the gas in the PM forming cavity, and the QCM is replaced with a glass slide. The fine particulate matter PM2.5 in the atmosphere contains sulfur oxides, nitrogen oxides, polycyclic aromatic hydrocarbons and other substances, while the smoke of cigarette combustion contains nitrogen oxides, aromatic hydrocarbons and other substances, which are similar to the types of PM2.5 in the atmosphere Therefore, in the study, the cigarette smoke environment was first considered and used as the gas in the PM forming cavity for the experiment. The device uses the virtual impactor and particle separation and concentration detector based on 3D printing technology as described above. In the experiment, the cigarette was lit, a dropper was used to connect one end of the cigarette, the burning end of the cigarette was put into the PM forming cavity, the dropper was gently squeezed to give the necessary gas flow...

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Abstract

The invention discloses a virtual impactor and particle separation and concentration detecting device and method based on the 3D printing technology. The virtual impactor and particle separation and concentration detecting device comprises a virtual impactor and a quartz crystal microbalance (QCM) resonance sensor. The virtual impactor is composed of a particle inlet, a middle small-flow channel, two large-flow channels on the two sides and a QCM support, wherein the large-flow microchannels on the two sides are flat and straight, the length of the middle small-flow microchannel is 20 mm, the middle small-flow microchannel is folded back and forth six times and gradually reduced at an inlet part, the surface of the QCM resonance sensor which is arranged on the main channel on one side and composed of electrodes on the front side and the back side is coated with a photoresist layer, and thus separated particles adhere to the QCM resonance sensor. The main channels on the two sides and the secondary channel in the middle are adopted to serve as separation units, and the separation rate for particles smaller than 2.5 micrometers is 90%; the concentration of the particles is reflected through the resonance changing rate with the QCM resonance sensor, and conversion to the electric quantity from non-electric quantity is carried out; the device is simple in structure, small in size, capable of working under a room-temperature environment and easy to process in a batched mode.

Description

technical field [0001] The invention belongs to the field of sensors in the technical field of micro-electromechanical systems (MEMS), and in particular relates to a virtual impactor and particle separation and concentration detector and method based on 3D printing technology. Background technique [0002] A microfluidic system is a system that processes or manipulates microfluidics using microchannels ranging in size from tens to hundreds of microns. Microfluidic control system technology was initially applied in the field of analysis. It has the advantages of small sample and reagent volume, high resolution and sensitivity of separation and detection, low cost, short analysis time, and reusability. Microfluidic technology not only has the characteristics of small size, but also takes advantage of the flow characteristics of the fluid in it, such as laminar flow. It provides a new method for the collection and separation of particles. [0003] The quartz crystal microbala...

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Application Information

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IPC IPC(8): G01N5/02G01N15/06B01D45/04
CPCG01N5/02B01D45/04G01N15/0606
Inventor 谢金赵久烜赵冉刘旻亮
Owner ZHEJIANG UNIV
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