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Article

Wicking in Paper Strips under Consideration of Liquid Absorption Capacity

1
Queensland Micro and Nanotechnology Centre (QMNC), Griffith University Nathan Campus, Nathan, Queensland 4111, Australia
2
School of Engineering and Built Environment, Griffith University Nathan Campus, Nathan, Queensland 4222, Australia
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Author to whom correspondence should be addressed.
Chemosensors 2020, 8(3), 65; https://doi.org/10.3390/chemosensors8030065
Received: 18 July 2020 / Revised: 3 August 2020 / Accepted: 4 August 2020 / Published: 6 August 2020
(This article belongs to the Section Analytical Methods, Instrumentation and Miniaturization)
Paper-based microfluidic devices have the potential of being a low-cost platform for diagnostic devices. Electrical circuit analogy (ECA) model has been used to model the wicking process in paper-based microfluidic devices. However, material characteristics such as absorption capacity cannot be included in the previous ECA models. This paper proposes a new model to describe the wicking process with liquid absorption in a paper strip. We observed that the fluid continues to flow in a paper strip, even after the fluid reservoir has been removed. This phenomenon is caused by the ability of the paper to store liquid in its matrix. The model presented in this paper is derived from the analogy to the current response of an electric circuit with a capacitance. All coefficients in the model are fitted with data of capillary rise experiments and compared with direct measurement of the absorption capacity. The theoretical data of the model agrees well with experimental data and the conventional Washburn model. Considering liquid absorption capacity as a capacitance helps to explain the relationship between material characteristics and the wicking mechanism. View Full-Text
Keywords: paper-based microfluidics; electrical circuit analogy; absorption capacity; wicking paper-based microfluidics; electrical circuit analogy; absorption capacity; wicking
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MDPI and ACS Style

Kasetsirikul, S.; Shiddiky, M.J.A.; Nguyen, N.-T. Wicking in Paper Strips under Consideration of Liquid Absorption Capacity. Chemosensors 2020, 8, 65. https://doi.org/10.3390/chemosensors8030065

AMA Style

Kasetsirikul S, Shiddiky MJA, Nguyen N-T. Wicking in Paper Strips under Consideration of Liquid Absorption Capacity. Chemosensors. 2020; 8(3):65. https://doi.org/10.3390/chemosensors8030065

Chicago/Turabian Style

Kasetsirikul, Surasak, Muhammad J.A. Shiddiky, and Nam-Trung Nguyen. 2020. "Wicking in Paper Strips under Consideration of Liquid Absorption Capacity" Chemosensors 8, no. 3: 65. https://doi.org/10.3390/chemosensors8030065

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