Light and heat control membrane microvalve device and method of use

Abstract

The invention discloses a photo-thermal control membrane type micro-valve device and a use method. The photo-thermal control membrane type micro-valve device comprises a PDMS micro-channel, and is characterized in that a fluid transport channel and a distilled water channel which are parallel to each other are arranged in the PDMS micro-channel, the fluid transport channel is used for transportinga main fluid, the distilled water channel is used for circulating distilled water so as to provide a steam pressure source, a partition plate is arranged between the fluid transport channel and the distilled water channel, a through hole is formed in the middle of the partition plate, the two end surfaces of the through hole are provided with a strain membrane and a hydrophobic breathable membrane correspondingly, the strain membrane, the hydrophobic breathable membrane and the through hole form a steam generation chamber, the strain membrane is located on one side of the fluid transport channel, moreover, the strain membrane is stressed to deform, a micro-valve is formed, the hydrophobic breathable membrane is located on one side of the distilled water channel, and an infrared laser is arranged on the outer side of the distilled water channel. The photo-thermal control membrane type micro-valve device can be widely applied to the fields of fluid transportation, chemical analysis, medical detection and the like.

Description

technical field [0001] The invention relates to the field of microfluidics, in particular to a photothermal control membrane microvalve device and a method for using it. Background technique [0002] Microfluidic technology is a technology involving fluid process processing and device manufacturing in micron-scale space. It uses miniaturized fluid processing and detection systems to study various effects and behaviors of microfluidics under the micron-scale structure. Due to its high-throughput microchannels and flow networks, efficient fluid handling and detection mechanisms, and potential low-cost applications, it has been widely used in the pharmaceutical industry, biotechnology and bioanalysis, medicine, chemical analysis, machinery, etc. , IT industry and even national defense and aerospace and other fields. [0003] As one of the main components of microfluidic systems, microvalve functions include flow regulation, on / off switching, and sealing of biomolecules, micro...

AI Technical Summary

Problems solved by technology

Conventional microvalve devices usually use glass, silicon wafers and other materials as substrates, and are processed by silicon microfabrication techniques (such as photolithography, etching, etc.), which have high requirements for processing equipment and raw materials, and high processing costs; The structure is relatively complex, usually a non-planar multi-layer three-dimensional structure, which needs to be processed by a multi-layer silicon bonding process. The process is cumbersome and complicated, and the processing cycle is long

More importantly, this non-planar microvalve structure is not easy to integrate into the microfluidic system, which increases the difficulty of integration of the microfluidic system.

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