Investigation Of Key Structure PDMS Membrane Capsule Production Microfluidics System Towards CO₂ Capture Application And Theory

Microfluidics technology has become an important technique for researchers from various background,such as biology engineering,medicine science,chemistry,etc.Due to the fact that relavant theory in microfluidics has developed a lot,people nowadays can predict the performance inside such microfluidics devices easily using theoritical analytical methods.Thus,researcher can design and fabricate micro devices with high quality,perform more developed practice and complete challenging experiments.The usage of PDMS contributes a lot to the development of microfluidics.PDMS membrane has won its own polularity in application in microfluidics.Based on the advatages of microfluidics,this paper novelly presents a microfludics system for CO₂ capture micro capsule production,which is efficient,low-cost and reliable in practice and offers a solution for repeatable production.For the future need of micro capsules productionm this paper focused on the micro valve arrays theory in high density microfluidic systems.This paper started from the key structure design study of the microfluidics system,and then developed into the investigation of high density microfluidic system design.Finally,the theory of microfludics production of CO₂ capture micro capsules and the application performance of the capsules in CO₂ capture practice was investigated.This paper investigasted the production of CO₂ capture micro capsules with PDMS as shell material experimentally and theoritycally.Micro capsules with PDMS as shell material is an effective method for CO₂ capture.The method presented in this paper novelly utilized PDMS microfluidic devices to produce micro capsules,which is totally different from conventional double-cappillary devices.With numerical simulation and analytical method,the design of the microfluidics system has been optimized.Finally,a 3D design has been obtained and verified by experimental results.Compared with the conventional methods,this paper novelly generated PDMS micro droplets and capsules in PDMS devices.Using microfluidics system,a novel advanced nano partical hybrid organic material was adopted as carbon capture material,and encapsulated in PDMS membrane.The performance of CO₂ capture was measured experimentally.Then the simulation of the mass transfer in the capture process was carried out.The size effect of micro capsules was analyzed theoritically.The model of CO₂ capture in these micro capsules was establised,resulting into the theory of gas capture in PDMS membrane micro capsules.Then,this paper investigated the behavior of PDMS membrane in pneumatic micro valves.For high desity micrifluidic system applicaiton,the performance of PDMS membrane micro valve array was studied.Using numerical simulation method,the interfacial effect,size effect and the geometry effect and relevant mechanics in the process has been investigated.Based on our simulated results,we formulate the main concerns for micro valve design and fabrication,which is significant for minimizing actuation pressures and ensuring reliable operation.Besides,this paper conducted an investigation into a novel fabrication method for PDMS membrane fabrication using Lift-off method,in order to ease the conventional PDMS membrane fabrication.PDMS membrane has been utilized widely in microfluidics.However,it is still chanllenging to fabricate PDMS thin membrane easily and effectively.In this paper,the surface morpholophy and bio-compitibility of the PDMS membranes fabricated using lift-off method has been characterized using SEM and live cells.Gold film has been deposited on the PDMS membrane,and the electric conductance has been measured.Finally,it proved that this lift-off method for PDMS memrbane fabrication is effective and reliable in practice.This paper inverstigated the structure design of microfluidics system,microcapsule pruduction by microfluidis,performance of microcapsules in gas capture,design theory of PDMS membrane micro valve arrays and PDMS production method,in order to meet the future requirement of application.