Results 251 to 260 of about 321,923 (285)
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Automatic flow delay through passive wax valves for paper-based analytical devices
Lab on a Chip, 2021This paper reports the numerical, mathematical, and experimental studies of flow delay through wax valves surrounded by PDMS walls on paper microfluidics.
Haixu Meng +6 more
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Dissolvable Polymer Valves for Sweat Chrono-Sampling in Wearable Paper-Based Analytical Devices
ACS Sensors, 2022Paper sensors with colorimetric signal transduction mechanisms are promising for developing single-use wearable patches that only require a smartphone to quantify signals. However, measuring biomarker fluctuations with colorimetric wearable sensors requires implementing a chrono-sampling method for performing sequential measurements.
Andreu Vaquer +2 more
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Magnetic timing valves for fluid control in paper-based microfluidics
Lab on a Chip, 2013Multi-step analytical tests, such as an enzyme-linked immunosorbent assay (ELISA), require delivery of multiple fluids into a reaction zone and counting the incubation time at different steps. This paper presents a new type of paper-based magnetic valves that can count the time and turn on or off a fluidic flow accordingly, enabling timed fluid control
Xiao, Li, Philip, Zwanenburg, Xinyu, Liu
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Automated paper-based devices by microfluidic timing-valve for competitive ELISA
2017 IEEE 30th International Conference on Micro Electro Mechanical Systems (MEMS), 2017We present a timing-valve mechanism on a paper-based device to conduct competitive ELISA procedures. The device consists of multiple channels, where timing-valves regulate each individual liquid flow, to automate sequential steps. The timing-valve is achieved using surfactants to dissolve the hydrophobic barriers and to allow fluid to pass through in a
Y.-T. Lai +3 more
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Development of a Thermoresponsive Valve Membrane for Microfluiic Paper-Based Analytical Devic
2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII), 2019Microfluidic paper-based analytical devices (μPADs) have recently attracted the attention of researchers and industry because they are small, easily fabricated, inexpensive, and require small sample volumes. However, it is difficult to simplify complex assays on such devices because there are limited means of fluid control.
Wataru Iwasaki +5 more
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Stimuli-Responsive Valving Mechanisms for Paper-Based Diagnostics
2020Rapid identification of disease-causing pathogens at the point-of-care enables immediate treatment and infection control. However, existing rapid diagnostic devices fail to detect the low concentrations of pathogens present in the early stages of infection, causing delayed and even incorrect treatment.
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Paper-based non-mechanical valves for autonomous multi-reagent lateral flow microfluidic devices
2014 IEEE Healthcare Innovation Conference (HIC), 2014In this paper we report the first three-dimensional (3D) and non-mechanical valve as a building block to create paper-based autonomous microfluidic devices. The valve consists of two layers of porous media that regulate flow direction. The valve also enables one fluid to gate another.
Chen, Hong +2 more
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Advanced Functional Materials, 2019
AbstractIn this work, a self‐powered electrowetting valve (SPEV) driven by an energy‐harvesting triboelectric nanogenerator (TENG) is reported. The TENG (5 × 5 cm2) can produce an open‐circuit voltage of 380 V by applying a mechanical stimulus, which is much higher than the actuation voltage of the SPEV (130 V).
Zi Hao Guo +9 more
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AbstractIn this work, a self‐powered electrowetting valve (SPEV) driven by an energy‐harvesting triboelectric nanogenerator (TENG) is reported. The TENG (5 × 5 cm2) can produce an open‐circuit voltage of 380 V by applying a mechanical stimulus, which is much higher than the actuation voltage of the SPEV (130 V).
Zi Hao Guo +9 more
openaire +1 more source
Distance-Readout Paper-Based Microfluidic Chip with a DNA Hydrogel Valve for AFB1 Detection
Analytical ChemistryAccurate and rapid aflatoxin B1 (AFB1) detection is essential for ensuring the safety of food supplies. In this paper, we introduce a distance-readout paper-based microfluidic chip (DPMC) that offers a sensitive and reliable method for the detection of AFB1. The DPMC comprises a DNA hydrogel sensitive valve and a paper-based capillary channel.
Peng Chen +4 more
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