A micro-fluidic chip apparatus adopting a substrate made of a PDMS material

Abstract

The invention relates to a micro-fluidic chip apparatus adopting a substrate made of a PDMS material, and belongs to the field of analysis testing. Preparation of substrates of micro-fluidic chips by utilizing polydimethylsiloxane, namely PDMS that is cheap and easy to process, has difficult problems actually. The PDMS material has a strongly hydrophobic surface, and targeted surface modification or surface decoration fails to achieve durable effects. The objective of the apparatus is to overcome the series of problems. The apparatus is characterized in that PDMS having an original surface is adopted as a substrate, a chain-ring type electromagnetic clamp equipped with a minitype ultrasonic transducer is positioned at a position near a sample liquid stream terminal of a micro-fluidic chip in a sleeve joint manner, and an ultrasonic attenuator is mounted at a feeding end of the micro-fluidic chip to achieve rapid ultrasonic wave intensity attenuation in a short distance, and therefore an interfacial tension difference is formed between the two ends of the chip, thus allowing the sample liquid stream to flow along originally hydrophobic capillary channels towards the terminal direction.

Description

technical field [0001] The invention relates to a microfluidic chip device using a PDMS substrate, 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, appear It looks like some ...

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 is another problem: the PDMS polymer molecules in the bulk phase of the PDMS material substrate have the characteristics of automatic diffusion and migration to the surface. The characteristics of polymer molecules diffusing and migrating to the surface automatically will make the modified state of the inner surface of the microchannel modified by the surface modification unable to maintain for a long enough time, and the microgroove after surface modification The maintenance time of the inner surface state of the channel is roughly only enough to complete the time required for the internal test experiment in the laboratory; in other words, the inner surface of the PDMS microchannel after surface modification or surface modification is formed after modification The surface state of the surface does not last long, but quickly tends to or changes back to the surface state before the surface modification, and returns to the original strongly hydrophobic surface state in a relatively short period of time. Then, just imagine, Can such microfluidic chips be produced in large quantities, stored in large quantities, and widely promoted? The answer is obvious, that is, impossible

This problem has also existed for many years, and so far, it has not been properly solved

Images