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1510 articles for “surfaces”
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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 Investigations on the Effects of Channel Aspect Ratio and Surface Wettability to Control the Surface-Driven Capillary Flow of Water in Straight PMMA Microchannels
Abstract: AbstractTotal 214 individual straight polymethylmethacrylate (PMMA) microchannels have been fabricated by the maskless lithography, hot embossing lithography, direct bonding technique, and atmospheric pressure air dielectric barrier discharge (DBD) plasma processing. The experimental investigations on the effects of structural properties (channel aspect ratios) and physical properties (surface wettability, capillary pressure and kinetic energy) on the surface-driven capillary flow of dyed water in straight PMMA microchannels is a novel approach in this …
Published in Trends in Opto-electro & Optical Communication · Vol. 6, Issue 3, 2016 · pp. 1–12 Read article
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Effect of Surface Wettability on the Surface-Driven Capillary Flow in SU-8 Microchannels
Abstract: AbstractSU-8 microfluidic devices have been fabricated by the maskless lithography. Passive capillary flow is suitable to manipulate liquid in the lab-on-a-chip systems. The surface-driven capillary flow of dyed water in each microfluidic device has been recorded and analysed. The measured static water contact angles are 72.6°and 81.2° on the hydrogenated amorphous carbon (a-C:H) deposited flat surface and Si-a:C:H deposited flat surface respectively. Either, a-C:H or Si-a:C:H has been deposited on …
Published in Trends in Opto-electro & Optical Communication · Vol. 6, Issue 2, 2016 · pp. 24–29 Read article
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Surface-Driven Capillary Flow on Microchannel Surface Coated with Diamond like Carbon of Nano-scale Thickness towards the Applications in Statistical Features of Fluid Mechanics
Abstract: In this experimental work, polymethylmethacrylate (PMMA) is the chosen polymer as device material to fabricate the microfluidic devices. PMMA is optically transparent polymer which is a facility to record the microfluidic flow of any dyed working liquid inside the fabricated microchannels. Two individual microfluidic devices are fabricated by lithographic techniques. Dyed water is selected and prepared as working liquid. Leakage-free surface-driven capillary flow of dyed water is recorded corresponding to …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 8, Issue 3, 2021 · pp. 8–12 Read article
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An Experimental Investigation on the Determination of Critical Micelle Concentration (CMC) Of Various Surfactants Using the Surface Tension Method
Abstract: This study primarily focuses on the experimental investigation for determining the critical micelle concentration (CMC) of various surfactants that are commonly employed to enhance the stability of nanoparticles in base fluids. In this context, three surfactants belonging to the anionic category—Sodium Dodecyl Sulfate (SDS), Sodium Lauryl Sulfate (SLS), and the bio-surfactant Rhamnolipid—were selected, along with one non-ionic polymer, Polyvinylpyrrolidone (PVP), which is used as a surfactant. The CMC of each …
Published in Journal of Polymer & Composites · Vol. 13, Issue 5, 2025 · pp. 145–153 Read article
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Surfactant-Mediated Synthesis and Stabilization of Colloidal Nanoparticles in Aqueous Media: A Preliminary Study on Controlling Parameters
Abstract: Surfactants dissolved in water possess a distinctive tendency to accumulate at surfaces or interfaces, a process that involves the migration of surfactant molecules from the bulk liquid phase to the interfacial region. This adsorption tendency of surfactants is being exploited in stabilization of the Nanoparticles (NPs) synthesized through colloidal chemistry routes. In present research, preliminary studies on controlling parameters involving various surfactants has been carried out to standardized the chemical …
Published in Journal of Materials & Metallurgical Engineering · Vol. 16, Issue 1, 2026 · pp. 25–35 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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Optical Recording of Surface-Driven Capillary Flow in Straight PMMA Microchannels
Abstract: AbstractIn this experimental work, a total of six individual straight microchannels are fabricated using maskless lithography, hot embossing lithography and direct bonding technique. Polymethylmethacrylate (PMMA) is the selected transparent polymer to fabricate these microchannels facilitating the optical recording of the surface-driven capillary flow of dyed water (working liquid) using a CMOS camera catching 25 frames per second with a corresponding time-scale resolution of 0.04 second. Dyed water as dyed working …
Published in Trends in Opto-electro & Optical Communication · Vol. 10, Issue 1, 2020 · pp. 24–30 Read article
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Short Report to Describe the Surface-driven Microfluidic Flow in Fluid Mechanics
Abstract: In this short report, a brief review on surface-driven microfluidic flow is provided. Also, the maskless lithography and indirect bonding technique are used to fabricate a single SU-8 based glass microfluidic device. Dyed ethylene glycol is prepared as working liquid to test the fabricated device. The surface-driven microfluidic flow of dyed ethylene glycol is recorded by a CMOS camera catching 25 frames per second with a corresponding time-scale resolution of …
Published in Recent Trends in Fluid Mechanics Read article
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Recording of the Surface-Driven Microfluidic Flow of Aqueous Working Liquids in PMMA Microfluidic Devices
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 Aspects of Surface-Driven Capillary Flow in Microfluidics
Abstract: AbstractAt least one of the length, width or height must be less than one millimetre in any microchannel. The fluidic motion in any microchannel is called the microfluidic flow. Surface-driven capillary flow is also called the passive capillary flow in microfluidics. Polymers are common materials to fabricate the microfluidic devices. In this work, different aspects of surface-driven capillary flow are briefly explained. Surface-driven capillary flow has many bioengineering applications that …
Published in Recent Trends in Fluid Mechanics · Vol. 7, Issue 1, 2020 · pp. 15–19 Read article
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Surface-Driven Microfluidic Flow in Fluid Mechanics
Abstract: In this short report, a brief review on surface-driven microfluidic flow is provided. Also, the maskless lithography and indirect bonding technique are used to fabricate a single SU-8 based glass microfluidic device. Dyed ethylene glycol is prepared as working liquid to test the fabricated device. The surface-driven microfluidic flow of dyed ethylene glycol is recorded by a CMOS camera catching 25 frames per second with a corresponding time-scale resolution of …
Published in Recent Trends in Fluid Mechanics · Vol. 8, Issue 3, 2021 · pp. 1–5 Read article
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Surface Engineering of Materials: A Review Based on Applications
Abstract: Surface characteristics of material play an important role for various applications. Like, there are many applications of the polymeric membranes in the fields of biomedical, filtration, food processing from the past few decades. But various problems have been faced in their applications due to bacterial and non-bacterial contamination on the surfaces. Many researchers have investigated the surface chemistry and roughness of the membranes to identify their properties and the difficulties …
Published in Journal of Polymer & Composites · Vol. 9, Issue 2, 2021 · pp. 45–56 Read article
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Surface-Driven Capillary Flow of Dyed Aqueous Ethanol in Sudden Expansion Microchannels
Abstract: AbstractIn this work, total three individual SU-8 based glass microfluidic devices are fabricated by maskless lithography and clamping. Dyed aqueous ethanol is selected as working liquid. Each surface-driven capillary flow is recorded by a CMOS camera. The filling time of surface-driven capillary flow is considered as the flow parameter to determine the flow speed. This work will be useful to fabricate the microfluidic devices for bioengineering applications.Keywords: Sudden expansion, maskless …
Published in Journal of Thermal Engineering and Applications · Vol. 4, Issue 3, 2017 · pp. 22–25 Read article
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Recording of Leakage-free Surface-Driven Capillary Flow of Dyed Water in the Dual Sudden Contraction Microchannels
Abstract: Dual sudden contractionpolymethylmethacrylate (PMMA) microchannels are fabricated by the maskless lithography, hot embossing lithography, direct bonding technique, and atmospheric pressure air dielectric barrier discharge (DBD) plasma processing. The surface-driven capillary flow of dyed water is faster on the processed PMMA surface than the pristine PMMA surface. The surface-driven capillary flow of dyed water is slower in the wider portion and faster in the narrower portion of any dual sudden contraction …
Published in Emerging Trends in Chemical Engineering · Vol. 4, Issue 2, 2017 · pp. 40–44 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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Surface-Driven Capillary Flow of AqueousIsopropyl Alcohol in the Sudden Expansion PMMA Microchannels
Abstract: Author has fabricated the PMMA sudden expansion microchannels by the maskless lithography, hot embossing lithography, drilling, direct bonding and chip separation technique. The effect of channel aspect ratio on the surface-driven capillary flow is studied in the sudden expansion microchannels fabricated by PMMA as a polymeric material. Also, the effect of surface wettability on the surface-driven capillary flow is studied in the sudden expansion microchannels fabricated by PMMA. This study …
Published in Emerging Trends in Chemical Engineering · Vol. 4, Issue 2, 2017 · pp. 1–4 Read article
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Experimental Study on the Surface-Driven Capillary Flow of Aqueous Microparticle Suspensions in the Straight PMMA Microchannels
Abstract: The straight polymethylmethacrylate (PMMA) microchannels are fabricated by the maskless lithography, hot embossing lithography and direct bonding technique. Total 120 individual PMMA microfluidic devices are fabricated by author’s own hands-on completely. Total 120 individual audio video interleave files as ‘FileName.avi’ are recorded and analyzed by author. The surface-driven capillary flow of different aqueous microparticle suspensions are recorded in these straight PMMA microchannels. The effects of channel aspect ratio, effective viscosity …
Published in Emerging Trends in Chemical Engineering · Vol. 3, Issue 3, 2016 · pp. 26–30 Read article
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Chemical Processing of SU-8 Photoresist to Record the Surface-Driven Microfluidic Flow of Dyed Working Liquid in the Regime of Fluid Mechanics
Abstract: Chemical processing of negative photoresist SU-8 is performed to fabricate a set of three individualSU-8 based glass microfluidic devices inside the cleanroom laboratory. The major steps of SU-8processing are spin coating using a spin coater, soft baking, ultra-violet (UV) exposure, post exposurebaking, development by SU-8 developer, and hard baking. The indirect bonding for leakage-freesealing is used during hard baking to fabricate the microfluidic devices. Author has prepared thedyed water to …
Published in Emerging Trends in Chemical Engineering · Vol. 8, Issue 1, 2021 · pp. 53–57 Read article
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Experimental Demonstration on the Leakage-Free Surface-Driven Capillary Flow of Red Dye
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