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61 articles for “Microfluidic devices”
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Passive Capillary Flow of Aqueous Working Liquids in the PMMA Microfluidic Devices and SU-8 based Glass Microfluidic Devices
Abstract: Abstract: In this work, total 9 individual polymeric microfluidic devices are fabricated. The passive capillary flows of aqueous working liquids are studied in the fabricated polymethylmethacrylate (PMMA) microfluidic devices and SU-8 based glass microfluidic devices. All the microfluidic devices are fabricated inside the cleanroom laboratory. Dyed aqueous ethanol and dyed aqueous isopropyl alcohol (IPA) are the selected working liquids. CMOS camera is used to record each passive capillary flow in …
Published in Recent Trends in Fluid Mechanics · Vol. 6, Issue 1, 2019 · pp. 23–28 Read article
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Optimisation of the Experimental Methods for the Fabrication of Polymer Microstructures and Polymer Microfluidic Devices for Bioengineering Applications
Abstract: In this research paper, total 2278 individual polymer microstructures have been fabricated, measured and analyzed. Also, in this research paper, total 216 individual polymer microfluidic devices have been fabricated by the maskless lithography, hot embossing lithography, direct bonding technique, and indirect bonding technique, to record and analyze the surface-driven (passive) capillary flow individually in each microfluidic device. Total three individual polymers as SU8, polymethylmethacrylate (PMMA), and polyimide have been used …
Published in Journal of Polymer & Composites · Vol. 4, Issue 3, 2016 · pp. 8–26 Read article
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Experimental Investigations on the Durability of PMMA Microfluidic Devices Fabricated by Hot Embossing Lithography with Plasma Processing for Bioengineering Applications
Abstract: In this research paper, total 1290 individual static contact angles of different working liquids have been measured and recorded on the flat polymethylmethacrylate (PMMA) surfaces. Total 474 individual PMMA microfluidic devices have been fabricated by the maskless lithography, hot embossing lithography and direct bonding technique inside the cleanroom laboratory and mechanical engineering workshop to determine the durability of these microfluidic devices. Total nine individual working liquids have been used to …
Published in Emerging Trends in Chemical Engineering · Vol. 3, Issue 3, 2016 · pp. 1–18 Read article
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A Study on Automatic Feedback Control by Image Processing for Mixing Solutions in a Microfluidic Device
Abstract: Precise and rapid mixing of chemical and biological reagents is a critical yet challenging aspect of microfluidic systems, often limited by laminar flow conditions and the need for manual or pre- programmed interventions. Existing mixing strategies frequently lack real-time adaptability and closed-loop control, hindering reproducibility and the execution of complex reaction protocols. This work presents an innovative automatic feedback control system utilizing the study on real- time image processing to …
Published in International Journal of Advanced Control and System Engineering · Vol. 3, Issue 2, 2025 · pp. 32–41 Read article
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Fabrication of the SU-8 based Glass Microfluidic Devices to Record the Surface-Driven Capillary Flow of Water
Abstract: Total 12 individual leakage-free SU-8 based glass microfluidic devices are fabricated by the maskless lithography and indirect bonding technique. The surface-driven capillary flow of dyed water is successfully recorded inside these microfluidic devices. Total 12 individual audio video interleave files as ‘FileName.avi’ are recorded and analyzed in this research paper. This study may be useful for different microfluidic applications.
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 3, Issue 3, 2016 · pp. 9–12 Read article
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Effect of Surface Free Energy on the Surface-Driven Capillary Flow in SU-8 based Glass Microfluidic Devices
Abstract: Surface-driven capillary flow of dyed water is recorded in the SU8 based glass microfluidic devices fabricated by the standard cleanroom processes. The effect of surface wettability on the surface-driven capillary flow is studied in the individual SU8 based microfluidic devices of glass bottom wall and polyimide bottom wall. The surface-driven capillary flow is faster on the glass bottom wall surface due to the higher polar component of solid surface free …
Published in Journal of Polymer & Composites · Vol. 4, Issue 3, 2016 · pp. 1–7 Read article
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Experimental Techniques to Fabricate the Microfluidic Devices
Abstract: The fluidic motion inside any microchannel is termed as the microfluidic flow. The subject of microfluidics is interdisciplinary in nature involving the principles of basic sciences and engineering. The microfluidic devices are fabricated by appropriate microfabrication techniques. Also, the inner surfaces of microfluidic devices are modified by choosing appropriate surface modification techniques depending on the device material. Also, the characterization techniques are required to determine the inner surface qualities of …
Published in Emerging Trends in Chemical Engineering · Vol. 5, Issue 2, 2018 · pp. 11–21 Read article
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Real-Life Demonstration on the Surface-Driven Capillary Flow in Microfluidic Devices
Abstract: AbstractIn this research paper, glass and PMMA are chosen as materials to fabricate the microfluidic devices due to the optical transparency of these materials. The microfluidic devices are fabricated by the maskless lithography (non-contact lithography), hot embossing lithography (contact lithography), indirect bonding technique, and direct bonding technique. The surface-driven capillary flow is recorded corresponding to each microfluidic device by a CMOS camera. The colour-images are compared with the gray-scale-images for …
Published in Trends in Opto-electro & Optical Communication · Vol. 6, Issue 2, 2016 · pp. 8–17 Read article
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Passive Capillary Flow of Red Dye in the SU-8 based Glass Microfluidic Devices
Abstract: In this work, total three individual SU-8 based glass microfluidic devices are fabricated by the maskless lithography and indirect bonding technique. Commercially available red coloured food dye is used as working liquid. Individual surface-driven capillary flows of red dye are recorded by the CMOS camera. This work will be useful in bioengineering applications.
Published in Trends in Mechanical Engineering & Technology · Vol. 8, Issue 3, 2018 · pp. 59–61 Read article
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Aspects of Diamond-Like Carbon based MEMS and Microfluidic Devices
Abstract: In general, diamond-like carbon (DLC) is the hydrogenated amorphous carbon (a-C:H) to be used in the fabrication of micro electromechanical systems (MEMS) and microfluidic devices. Mukhopadhyay as author has recently demonstrated the variation of surface wettability in polymer based microchannels by the use of DLC. Also, DLC can be used as an anti-stiction coating in different applications. In this review, different features of DLC are briefly highlighted. This educational short …
Published in Journal of Petroleum Engineering & Technology · Vol. 8, Issue 1, 2018 · pp. 31–33 Read article
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Optical Recording of Flow Phenomena in Photoresist based Microfluidic Devices
Abstract: AbstractIn this experimental work, a set of three individual SU-8 based glass microfluidic devices are fabricated by maskless lithography and indirect bonding technique without having any microfluidic leakage. Dyed ethanol (10% ethanol, 90% red dye) is prepared and used as dyed working liquid. The microfluidic leakage is observed in other set of two leaky microfluidic devices due to improper indirect bonding technique. The effect of surface-to-volume ratio on surface-driven capillary …
Published in Trends in Opto-electro & Optical Communication · Vol. 10, Issue 1, 2020 · pp. 36–42 Read article
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Short Review on the Materials for Microfluidics with the Experiments to Record the Surface-Driven Capillary Flow of Dyed Water in Fabricated Microfluidic Device for Bioengineering Applications
Abstract: In this review, dominant features of suitable materials for the fabrication of microfluidic devices are briefly mentioned. Surface modification techniques are useful to vary the flow-speed in microfluidic devices. Surface modification techniques are dependent on the choice of device materials. In this present paper, a single polymeric microfluidic device as sudden expansion microchannel is fabricated by author using maskless lithography, hot embossing lithography and direct bonding technique. Also, the surface-driven …
Published in Recent Trends in Fluid Mechanics · Vol. 7, Issue 3, 2020 · pp. 1–4 Read article
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Experimental Demonstration on Microfluidic Capillary Flow of Red Dye in Photoresist based Glass Microfluidic Devices
Abstract: In this experimental work, a set of three individual SU-8 based glass microfluidic devices are fabricated by maskless lithography and indirect bonding technique in leakage-free conditions. Commercially available red coloured food dye is used as the selected working liquid. The microfluidic leakage in other set of two leaky microfluidic devices is experimentally demonstrated. Microfluidic devices should be fabricated at leakage-free conditions to achieve exact fluid flow characteristics. The effect of …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 7, Issue 1, 2020 · pp. 1–7 Read article
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Recording on Passive Capillary Flow of Dyed Working Liquids in the Polymer based Microfluidic Devices Fabricated inside the Cleanroom Laboratory
Abstract: In this experimental work, author has fabricated total 13 individual microfluidic devices using the maskless lithography, hot embossing lithography, direct bonding technique, diamond like carbon (DLC) coating, and laboratory-made clamping inside the cleanroom laboratory using author’s own hands-on completely. Polymethylmethacrylate (PMMA) is the chosen polymer to fabricate the 10 individual microfluidic devices due to its plasticity and optical transparency. Dyed water, dyed ethylene glycol and dyed ethanol are the prepared …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 7, Issue 3, 2020 · pp. 35–44 Read article
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Surface-Driven Capillary Flow of Aqueous Microparticle Suspensions as Working Liquids in the PMMA Microfluidic Devices
Abstract: AbstractPolymethylmethacrylate (PMMA) microfluidic devices have been fabricated by the maskless lithography, hot embossing lithography, drilling and direct bonding technique. The influence of effective viscosity on the speed of surface-driven capillary flow of aqueous microparticle suspensions has been studied. The surface-driven capillary flow of any particular aqueous microparticle suspension is faster in the microchannel of larger channel aspect ratio. Also, the surface-driven suspension flow is faster on the surface of higher …
Published in Trends in Opto-electro & Optical Communication · Vol. 7, Issue 1, 2017 · pp. 18–21 Read article
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Experimental Studies on the Capillary Flow Phenomena in Polyimide Based Glass Microfluidic Devices
Abstract: The polyimide based glass microfluidic devices are fabricated using the maskless lithography. Water is the only working liquid in this work. The effects of micropillar side length, microfluidic friction and surface area to volume ratio on the surface-driven capillary flow of water are studied experimentally. The surface-driven capillary flow of water is slower due to higher microfluidic friction. This work will be useful to control the water inside the microfluidic …
Published in Emerging Trends in Chemical Engineering · Vol. 4, Issue 3, 2017 · pp. 22–26 Read article
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Experimental Studies on the Passive Capillary Flow of Non-aqueous Working Liquids in PMMA Microfluidic Devices of Rectangular Cross-Sections
Abstract: The polymethylmethacrylate (PMMA) microfluidic devices are fabricated by the maskless lithography, hot embossing lithography and direct bonding technique. The effects of liquid viscosity, surface wettability and channel aspect ratio on the surface-driven capillary flow of non-aqueous working liquids are studied in the fabricated PMMA microfluidic devices. The working liquids are ethylene glycol, isopropyl alcohol (IPA) and ethanol. These experimental studies will be useful to manipulate different non-aqueous working liquids inside …
Published in Journal of Polymer & Composites · Vol. 5, Issue 2, 2017 · pp. 29–33 Read article
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Recording of Surface-Driven Laminar Flow in Dual Sudden Expansion Microchannel of a Single SU-8 based Glass Microfluidic Device
Abstract: In this work, the SU-8 based glass microfluidic device is fabricated by maskless lithography and indirect bonding technique. A dual sudden expansion microchannel is designed and fabricated inside this fabricated glass microfluidic device. Dyed water is prepared as working liquid by mixing commercially available food dye with distilled water. The surface-driven laminar flow of dyed water inside the fabricated microchannel is recorded by a CMOS camera. This experimental work is …
Published in Recent Trends in Fluid Mechanics · Vol. 7, Issue 1, 2020 · pp. 24–27 Read article
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Surface-Driven Capillary Flow of the Dyed Aqueous Ethanol in a single SU-8 based Glass Microfluidic Device integrated with the Arrays of Square Polyimide Micropillars
Abstract: In this work, a single SU-8 based glass microfluidic device is fabricated by the maskless lithography and indirect bonding technique. A particular polyimide layer at the selected portions and the arrays of square polyimide micropillars at the other portions are integrated on the microchannel bottom wall by the maskless lithography. Dyed aqueous ethanol (70% dyed water, 30% ethanol) is prepared as the working liquid in this work. A CMOS camera …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 6, Issue 1, 2019 · pp. 33–37 Read article
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Microfluidic Flow of the Dyed Aqueous Isopropyl Alcohol in a single SU-8 based Glass Microfluidic Device Fabricated inside the Cleanroom Laboratory
Abstract: A single SU-8 based glass microfluidic device is fabricated by maskless lithography and indirect bonding technique, using author’s own hands-on completely inside the cleanroom laboratory. Dyed aqueous isopropyl alcohol (90% dyed water, 10% isopropyl alcohol) is the prepared working liquid in this work. The surface-driven microfluidic flow of working liquid is recorded by a CMOS camera catching 25 frames per second with a corresponding time-scale resolution of 0.04 second. The …
Published in Journal of Catalyst & Catalysis · Vol. 6, Issue 1, 2019 · pp. 10–13 Read article