3D printing has lately received considerable critical attention for the fast fabrication of 3D structures to be utilized in various industrial applications. This study aimed to fabricate a micro beam with digital light processing (DLP) based 3D printing technology. Compound technology and essential coefficients of the 3D printing operation were applied. To observe the success of the DLP method, it was compared with another fabrication method, called projection micro-stereolithography (PμSL). Evaluation experiments showed that the 3D printer could print materials with smaller than 86.7 µm dimension properties. The micro beam that moves in one direction (y-axis) was designed using the determined criteria. Though the same design was used for the DLP and PμSL methods, the supporting structures were not manufactured with PμSL. The micro beam was fabricated by removing the supports from the original design in PμSL. Though 3 μm diameter supports could be produced with the DLP, it was not possible to fabricate them with PμSL. Besides, DLP was found to be better than PμSL for the fabrication of complex, non-symmetric support structures. The presented results in this study demonstrate the efficiency of 3D printing technology and the simplicity of manufacturing a micro beam using the DLP method with speed and high sensitivity.
It is the aim to develop optimization techniques to separate platelets from Red Blood Cells (RBCs) after designing and analyzing a microfluidic chip in this study.
This study aims to perform optimizatione to achieve the best diffusion control between the channels by designing and analysing a microfluidic-based micromixer. The design and analysis of the micromixer were made with the COMSOL Multiphysics program. Some input and output parameters must be defined for diffusion control of the micromixer. Among these parameters, inputs are the diffusion coefficient and inlet flow rate, while outputs are velocity, pressure, and concentration. Each input parameter in the microfluidic chip affects the output of the system. To make the diffusion control in the most optimum way, the data were obtained by making much analysis. The data obtained from this program was also provided with the Fuzzy Logic method to optimize the microfluidic chip. The diffusion coefficient value (5E-11 m2/s) should be given to the channels to achieve the optimum diffusion between the micromixer channels, if the inlet flow rate value (15E-15 m3/s) is the output value of the system, the velocity is 0.09 mm/s. The pressure is 2 Pa, and the concentration is 0.45 mol/m3. These values are the optimum values obtained from the analysis without damaging the liquid’s microfluidic channels supplied to the micromixer’s inlet.
Öz Bu çalışmada birçok mikro-elektro-mekanik-sistemin (MEMS) temelini oluşturan mikro kirişin tasarımı ve deformasyon analizi gerçekleştirilmiştir. Mikro kiriş içerisinden geçen akım, termal genleşme ile ısı enerjisini dağıtmaktadır. Bu genleşme, kiriş içerisinden geçen akım ve yayılan sıcaklığa bağlı olarak değişmektedir. COMSOL yazılımı kullanılarak tasarlanan model için polikristalin silikon malzeme ataması gerçekleştirilerek gerekli analizler yapılmıştır. Bu malzeme, önemli fiziksel ve elektriksel özellikleri nedeniyle MEMS alanında çok sık kullanılan bir malzeme türüdür. Modellenen mikro kirişin iki ucundaki destek noktaları bir substrata sıkıca bağlanır. Bu destek noktalarından modele 10V giriş potansiyeli uygulanarak mikro kirişte ortaya çıkan deformasyon ve sıcaklık verileri incelenmiştir. Deneysel çalışmalarda polikristalin malzeme atanan mikro kirişin uzunluğu değiştirilerek ortaya çıkan deformasyonlar rapor edilmiştir. Dört farklı kiriş uzunluğu (50 µm, 100 µm, 150 µm ve 200 µm) girilerek oluşturulan modellerde ortaya çıkan deformasyon verileri arasında ciddi bir artış gözlemlenirken; sıcaklık değerleri birbirine yakın çıkmıştır. Polikristalin silikon malzeme için en yüksek deformasyon 200 µm uzunluğundaki mikro kirişte 2.01 µm iken; en düşük deformasyon 50 µm uzunluğunda 0.6 µm olarak ölçülmüştür. 100 µm ve 150 µm mikro kiriş uzunlukları için deformasyon değerleri ise sırasıyla 0.93 µm ve 1.41 µm olarak ölçülmüştür. Sıcaklık verileri ise en düşük 4890 K iken; en yüksek 4940 K olarak ölçülmüştür. Sonuç olarak, mikro kiriş tasarımında kiriş uzunluğu değişiminin deformasyon özelliklerini ciddi bir biçimde etkilediği gözlemlenmiştir.
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