Viscosity measurements utilizing a fast-flow microfluidic paper-based device

Jang, Inseok; Berg, Kathleen E.; Henry, Charles S.

doi:10.1016/j.snb.2020.128240

Cited by 31 publications

(22 citation statements)

References 52 publications

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“…Figure 6b shows the distance variation of the flow front over time in the main channel, and Figure 6c shows the flow velocity over time calculated from the distance variation result. As in previous experimental and theoretical studies, it was confirmed that the flow rate of the Y-shaped device increased as the channel height increased (38,39). The 200, 300, and 400 μm height channels caused flow to travel 45 mm in 11.6±0.6, 4.2±0.1, and 2.6±0.3 s, respectively, with maximum flow velocity of 4.9±0.1, 13.3±0.3, and 21.1±1.6 mm/s.…”

Section: Flow Rate Variation Due To Channel Height and Fluid Propertiessupporting

confidence: 84%

Flow control in a laminate capillary-driven microfluidic device

Jang

Kang

Song

et al. 2021

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Section: Flow Rate Variation Due To Channel Height and Fluid Propertiessupporting

confidence: 84%

Flow control in a laminate capillary-driven microfluidic device

Jang

Kang

Song

et al. 2021

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“…Circuit patterns printed on paper have obvious advantages such as low cost, portability, environmental protection and recyclability. It can be applied to flexible electronic products (Nguyen et al , 2020; Jang et al , 2020; Call et al , 2020; Noviana et al , 2020; Cinti et al , 2019; Tomei et al , 2019; Antonacci et al , 2020; Moccia et al , 2020; Jemmeli et al , 2020; Deroco et al , 2020; Wang et al , 2016; Hamedi et al , 2016).…”

Section: Research Background and Significancementioning

confidence: 99%

Preparation and application of water-based nano-silver conductive ink in paper-based 3D printing

Zhao

Wang

2021

RPJ

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Purpose In flexible electronics applications, organic inks are mostly used for inkjet printing. Three-dimensional (3 D) printing technology has the advantages of low cost, high speed and good precision in modern electronic printing. The purpose of this study is to solve the high cost of traditional printing and the pollution emissions of organic ink. It is necessary to develop a water-based conductive ink that is easily degradable and can be 3 D printed. A nano-silver ink printed circuit pattern with high precision, high conductivity and good mechanical properties is a promising strategy. Design/methodology/approach The researched nano-silver conductive ink is mainly composed of silver nanoparticles and resin. The effect of adding methyl cellulose on the ink was also explored. A simple 3 D circuit pattern was printed on photographic paper. The line width, line length, line thickness and conductivity of the printed circuit were tested. The influence of sintering temperature and sintering time on pattern resistivity was studied. The relationship between circuit pattern bending performance and electrical conductivity is analyzed. Findings The experimental results show that the ink has the characteristics of low silver content and good environmental protection effect. The printing feasibility of 3 D printing circuit patterns on paper substrates was confirmed. The best printing temperature is 160°C–180°C, and the best sintering time is 30 min. The circuit pattern can be folded 120°, and the cycle is folded more than 60 times. The minimum resistivity of the circuit pattern is 6.07 µΩ·cm. Methyl cellulose can control the viscosity of the ink. The mechanical properties of the pattern have been improved. The printing method of 3 D printing can significantly reduce the sintering time and temperature of the conductive ink. These findings may provide innovation for the flexible electronics industry and pave the way for alternatives to cost-effective solutions. Originality/value In this study, direct ink writing technology was used to print circuit patterns on paper substrates. This process is simple and convenient and can control the thickness of the ink layer. The ink material is nonpolluting to the environment. Nano-silver ink has suitable viscosity and pH value. It can meet the requirements of pneumatic 3 D printers. The method has the characteristics of simple process, fast forming, low cost and high environmental friendliness.

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“…Several types of viscometers are widely available, such as rotational viscometers, capillary viscometers, falling-ball viscometers, and so forth. However, these conventional viscometers typically utilize large volumes of liquid (>2 mL), require frequent cleaning, and involve time-consuming procedures. , We introduce a new type of viscometer which can measure liquid viscosity using a simple procedure and a single liquid droplet. The process only requires information on droplet contact angles and contact-line dissipation.…”

Section: Introductionmentioning

confidence: 99%

Ultrasmall Volume Single-Droplet Viscometry: Monitoring Cornering Instabilities on Omniphobic Polydimethylsiloxane Brushes

Khatir

Golovin

2021

Langmuir

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Viscosity is an essential fluid property that is important for industrial and laboratory applications. For biological, complex, and/or precious liquid samples, the available volume of fluid is limited, yet there are few existing techniques to measure the viscosity of small volumes of liquids. We report a facile method to measure the viscosity of liquids by monitoring the sliding of single-cornered droplets on surfaces coated with an omniphobic film that minimizes the contact-angle hysteresis. The developed measurement method was capable of accurately characterizing the viscosity of various liquids and showed statistically equivalent values when compared to the literature, for fluids with viscosities ranging from 0.35 to ∼800 mPa s (acetone to castor oil). Using the developed single-droplet viscometer, the minimum volume required to measure the viscosity of hexadecane, dodecane, toluene, and ethanol was <5 μL and was <1 μL for decane and isopropyl alcohol, respectively. Further, the viscosity of hexadecane measured from 22 to 70 °C matched literature values precisely. The single-droplet, small-volume viscometer also requires minimal cleaning due to the omniphobic surface, meaning the fluid may be reused for other purposes with no liquid loss occurring due to the viscosity measurement.

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Viscosity measurements utilizing a fast-flow microfluidic paper-based device

Cited by 31 publications

References 52 publications

Flow control in a laminate capillary-driven microfluidic device

Flow control in a laminate capillary-driven microfluidic device

Preparation and application of water-based nano-silver conductive ink in paper-based 3D printing

Ultrasmall Volume Single-Droplet Viscometry: Monitoring Cornering Instabilities on Omniphobic Polydimethylsiloxane Brushes

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