Microfluidic chip device with polydimethylsiloxane as substrate material

Abstract

The invention relates to a microfluidic chip device with polydimethylsiloxane as a substrate material and belongs to the field of analysis and testing. By using cheap and easily-processable polydimethylsiloxane, namely PDMS for manufacturing a substrate of a microfluidic chip, there exist some problems. The surface of the PDMS material is strongly hydrophobic. Through targeted surface modification, the effect is hard to last. The scheme aims to solve the series of related problems. According to main points of the scheme, PDMS with primitive surface is selected as the substrate, a hinge-type fixture attached with a miniature ultrasonic transducer is manually fastened and positioned near the terminal of a sample liquid fluid of the microfluidic chip, interfacial tension is reduced by ultrasonic wave, and by PDMS's strong absorption of ultrasonic wave, ultrasonic intensity is rapidly decreased progressively in a short distance so as to form interfacial tension difference between two endsof the chip. Thereby, the sample liquid fluid is driven to flow along an originally hydrophobic capillary channel towards the terminal.

Description

technical field [0001] The invention relates to a microfluidic chip device using polydimethylsiloxane as a substrate material, belonging to the field of analysis and testing. Background technique [0002] For the overall overview of microfluidic technology itself, you can refer to the monograph "Illustrated Microfluidic Chip Laboratory" published by the famous microfluidic expert Mr. Lin Bingcheng not long ago, which has been published by Science Press. The past, present, and future prospects of fluidic technology, etc., all have detailed and long-form expositions that go deep into specific details. [0003] The fields where microfluidic chips are often applied include various analysis and detection of sample solutions containing biomacromolecules. [0004] The basic structure of a microfluidic chip includes a substrate etched with tiny liquid flow channels and a cover sheet attached to it. The tiny liquid flow channels on the substrate, before the cover sheet is assembled,...

AI Technical Summary

Problems solved by technology

[0006] But it's not that simple

[0007] First, this polydimethylsiloxane material, the material referred to by the acronym PDMS, is itself a strongly hydrophobic material. Microchannels are built on this material. If the microchannels are not targeted The modification operation of the surface of the channel, then, after the overall assembly is completed, that is, after the cover is covered, because the inner surface of the micro channel in the structure occupies most of the inner surface of the liquid flow channel, then the PDMS micro channel The strong hydrophobic characteristic of the inner surface of the channel is the decisive factor, which will make it very difficult for the polar liquid flow similar to the aqueous solution to pass through, and its flow resistance is so large that even ordinary micropumps are difficult to push. Of course, If the cover sheet also chooses to use the PDMS material, then the problem is basically the same, with little difference; therefore, in the prior art, it is necessary to modify and modify the inner surface of the microchannel on the PDMS material; then , is this modification operation for the inner surface of the PDMS microchannel very troublesome? That's not the problem. What constitutes a serious technical problem i

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