42 publications
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Experimental Studies on the Passive Capillary Flow of Non-aqueous Working Liquids in PMMA Microfluidic Devices of Rectangular Cross-SectionsBy Subhadeep Mukhopadhyay
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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Effect of Surface Free Energy on the Surface-Driven Capillary Flow in SU-8 based Glass Microfluidic DevicesBy Subhadeep Mukhopadhyay
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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Optimisation of the Experimental Methods for the Fabrication of Polymer Microstructures and Polymer Microfluidic Devices for Bioengineering ApplicationsBy Subhadeep Mukhopadhyay
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 Studies to Record the Lithographically Fabricated Microstructures by Surface Profilometry and Scanning Electron Microscopy for Microfluidic Laboratory-on-a-Chip SystemsBy Subhadeep Mukhopadhyay
Abstract: In this research paper, the poly(methyl methacrylate) (PMMA) microfluidic laboratory-on-a-chip system is fabricated in the cleanroom laboratory by maskless lithography, hot embossing lithography and direct bonding technique. The microstructures of the lab-on-a-chip system are measured by surface stylus profilometer. Also, the images of microstructures of lab-on-a-chip system are captured by using scanning electron microscopy (SEM). This fabricated lab-on-a-chip system is useful in bioengineering applications.
Published in Journal of Polymer & Composites · Vol. 4, Issue 1, 2016 · pp. 27–36 Read article →
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Recording of the Surface-Driven Microfluidic Flow of Aqueous Working Liquids in PMMA Microfluidic DevicesBy Subhadeep Mukhopadhyay
Abstract: In this work, the pristine polymethylmethacrylate (PMMA) microchannel surfaces are modified by the air dielectric barrier discharge (DBD) plasma processing, nitrogen plasma treatment, Undoped diamond-like carbon (DLC) coating, and Si-doped DLC coating, to produce the PMMA microfluidic devices having inner walls of different surface wettability. Dyed water and dyed aqueous ethanol (90% dyed water, 10% ethanol) are the selected two aqueous working liquids. The video recording of each surface-driven microfluidic …
Published in Emerging Trends in Chemical Engineering · Vol. 5, Issue 3, 2018 · pp. 24–31 Read article →
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Experimental Demonstration on the Leakage-Free Surface-Driven Capillary Flow of Red DyeBy Subhadeep Mukhopadhyay
Abstract: In this work, two individual SU-8 based glass microfluidic devices are fabricated by the maskless lithography and indirect bonding technique. Commercially available red-colored food dye is used as the working liquid. Microfluidic leakage is observed between the glass lid and SU-8 based microchannel substrate due to the improper indirect bonding technique. Leakage-free surface-driven capillary flow is observed due to the proper indirect bonding technique. CMOS camera is used to capture …
Published in Journal of Catalyst & Catalysis · Vol. 5, Issue 3, 2018 · pp. 8–11 Read article →
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Studies on the Electrical Characteristics of AlGaAs/GaAs High Electron Mobility TransistorsBy Subhadeep Mukhopadhyay
Abstract: AbstractIn this work, total 5722 individual simulation outputs are reported. The effects of drain voltage, gate voltage, aluminium mole fraction, and gate length on drain current are studied in AlGaAs/GaAs high electron mobility transistors (HEMTs). The linear region and saturation region are prominent in each drain characteristic curve. The drain current reduces in the structure of larger gate length. This work is useful to fabricate the HEMT based biomedical sensors. …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 5, Issue 3, 2018 · pp. 30–40 Read article →
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Educational Review on the Neutron Physics and Third QuantisationBy Subhadeep Mukhopadhyay
Abstract: Quantum theory is the first quantisation, and quantum field theory is the second quantisation in physics. The third quantisation has been recently introduced by Mukhopadhyay as author by the invention of concept theory. The general properties of nuclei are briefly depicted in this review. Also, the physics of neutrons is briefly mentioned. In future, the concept of third quantisation may become a useful theoretical technique to develop the analysis on …
Published in Journal of Nuclear Engineering & Technology · Vol. 8, Issue 2, 2018 · pp. 8–10 Read article →
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Passive Capillary Flow of Aqueous Working Liquids in the Straight PMMA Microchannels of Rectangular Cross- sectionsBy Subhadeep Mukhopadhyay
Abstract: In this report, polymethylmethacrylate (PMMA) is used to fabricate the straight microchannels of uniform channel widths having rectangular cross-sections. Maskless lithography, hot embossing lithography and direct bonding are the chosen techniques to fabrication the straight PMMA microchannels. Aqueous ethanol and aqueous isopropyl alcohol (IPA) are the prepared aqueous working liquids to study the passive capillary flow characteristics. Total 8 individual straight PMMA microchannels are fabricated in this work. This work …
Published in Journal of Petroleum Engineering & Technology · Vol. 8, Issue 2, 2018 · pp. 5–8 Read article →
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Effect of PMMA Micropillars on the Surface-Driven Capillary Flow of Dyed Aqueous Ethanol in PMMA MicrochannelsBy Subhadeep Mukhopadhyay
Abstract: In this work, dyed aqueous ethanol (60% ethanol, 40% dyed water) is prepared as the working liquid. The effect of surface modification on the microfluidic flow of aqueous ethanol is studied in the polymethylmethacrylate (PMMA) devices. The effect of surface area to volume ratio on microfluidic flow of aqueous ethanol is also studied. The effect of microfluidic friction on microfluidic flow of aqueous ethanol is also studied. This work will …
Published in Journal of Catalyst & Catalysis · Vol. 5, Issue 2, 2018 · pp. 1–4 Read article →
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Effect of Surface Modifications on the Meniscus Velocities of Dyed Water in PMMA MicrochannelsBy Subhadeep Mukhopadhyay
Abstract: In this work, author has fabricated the polymethylmethacrylate (PMMA) microfluidic devices to study the effect of surface modification techniques on surface-driven capillary flow. Maskless lithography, hot embossing lithography and direct bonding technique are used to fabricate the PMMA microfluidic devices. The effect of static water contact angle on surface- driven capillary flow is studied in the fabricated devices. The effect of the arrays of square PMMA micropillars on surface-driven capillary …
Published in Emerging Trends in Chemical Engineering · Vol. 5, Issue 2, 2018 · pp. 1–4 Read article →
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Experimental Techniques to Fabricate the Microfluidic DevicesBy Subhadeep Mukhopadhyay
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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Short Review on Medical Applications of Particle Accelerators for Cancer TherapyBy Subhadeep Mukhopadhyay
Abstract: AbstractThe cancer therapy by accelerators depends mainly on the following technologies: higher RF electron linear accelerator (linac); optimization of proton linac; synchrotron, cyclotron; superconducting magnet; and principles of laser. Firstly, the medical accelerators are described as a set of high RF linacs, synchrotrons, cyclotrons and superconducting magnets. Secondly, the medical accelerators are described as a set of accelerators applying the principles of laser. This short review will be helpful to …
Published in Journal of Nuclear Engineering & Technology · Vol. 7, Issue 3, 2017 · pp. 9–11 Read article →
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Report on Indian Nuclear Programs from the 20th Century of 2nd Millennium to the 21st Century of 3rd MillenniumBy Subhadeep Mukhopadhyay
Abstract: In this report, the fundamental models of nuclear physics and nuclear chemistry are briefly mentioned by author. Outline of the establishment and research-directions of Bhabha Atomic Research Centre (BARC) is briefly described. Strategies regarding the Indian nuclear power plants are briefly described. Also, the Pokhran-Test-1 and Pokhran-Test-2 are briefly described to manifest the outline of Indian nuclear programs implemented in the Indian territory. In this 21st century of 3rd millennium, …
Published in Journal of Nuclear Engineering & Technology · Vol. 7, Issue 2, 2017 · pp. 4–11 Read article →
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Passive Capillary Flow of Aqueous Working Liquids in the SU-8 based Microchannel BendsBy Subhadeep Mukhopadhyay
Abstract: In this work, total 4 individual SU-8 based microchannel bends are fabricated by maskless lithography and indirect bonding technique. The leakage-free surface-driven capillary flow of aqueous ethanol is recorded by a CMOS camera. Also, the leakage-free surface-driven capillary flow of aqueous isopropyl alcohol (IPA) is recorded by the CMOS camera. This work will be useful in bioengineering applications.
Published in Emerging Trends in Chemical Engineering · Vol. 5, Issue 1, 2018 · pp. 20–22 Read article →
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Aspects of Diamond-Like Carbon based MEMS and Microfluidic DevicesBy Subhadeep Mukhopadhyay
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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Passive Capillary Flow of Aqueous Working Liquids in the PMMA Microchannel BendsBy Subhadeep Mukhopadhyay
Abstract: In this work, passive capillary flows or surface-driven capillary flows are recorded in polymethylmethacrylate (PMMA) microfluidic devices using aqueous ethanol and aqueous isopropyl alcohol (IPA) as chosen aqueous working liquids. Microchannel bends are the chosen microfluidic devices with the selected microchannel widths of 50, 120 and 200 micron. This work will be useful to fabricate the PMMA laboratory-on-a-chip systems for bioengineering applications.
Published in Journal of Catalyst & Catalysis · Vol. 5, Issue 1, 2018 · pp. 21–24 Read article →
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Studies on the Variations of Drain Current in Gallium Nitride based High Electron Mobility TransistorsBy Subhadeep Mukhopadhyay
Abstract: AbstractIn this work, total 2477 individual simulation outputs are reported. Variations in drain current with respect to the electrical parameters (drain voltage and gate voltage) and structural parameters of high electron mobility transistors (HEMTs) have been studied. The drain current is higher corresponding to larger aluminium mole fraction. This study will be useful to fabricate the HEMT based biomedical sensors.Keywords: Drain current, drain voltage, gate voltage, high electron mobility transistorCite …
Published in Journal of Microwave Engineering and Technologies · Vol. 5, Issue 1, 2018 · pp. 13–24 Read article →
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Studies on the DC Characteristics of Nanoelectronic Single-Heterojunction GaN based HEMTs with AlGaN Layer of 22 nmBy Subhadeep Mukhopadhyay, Sanjib Kalita
Abstract: AbstractIn this work, total 2367 individual simulation-outputs are reported. We have studied the drain characteristics in AlGaN/GaN high electron mobility transistors (HEMTs) having the AlGaN thickness of 22 nm. According to this study, the drain current increases with drain voltage. Also, the drain current increases with gate voltage. The drain current is observed as higher at larger aluminium mole fraction. Also, the drain current is higher at larger doping concentration. …
Published in Journal of Microwave Engineering and Technologies · Vol. 5, Issue 1, 2018 · pp. 1–12 Read article →
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Effect of Aluminium Nitride Layer on the Electrical Performance of Microelectronic HEMTsBy Sanjib Kalita, Laishram Thoibileima Chanu, Subhadeep Mukhopadhyay
Abstract: AbstractIn this simulation work, a series of simulation outputs are reported related to the AlGaN/GaN single-heterojunction high electron mobility transistors (HEMTs). The effect of aluminium nitride nucleation layer on the drain characteristics is significant in single-heterojunction AlGaN/GaN HEMTs. The effects of drain voltage and gate voltage on the drain current are studied in the designed and simulated device structures. This simulation work may be a useful prediction to fabricate the …
Published in Journal of Microelectronics and Solid State Devices · Vol. 4, Issue 3, 2017 · pp. 9–12 Read article →