Rapid and even spreading of complex fluids over a large area in porous substrates

Agrawal, P and Kumar, H and Kumar, P (2020) Rapid and even spreading of complex fluids over a large area in porous substrates. In: Applied Physics Letters, 117 (7).

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Abstract

Rapid and even spreading of complex fluids over a large area on substrates like paper is required for chemical and biological sensing applications. Non-Newtonian flow behavior and the presence of multi-phase components pose a significant challenge to uniform flow in porous media. Specifically in the case of blood, for biosensing applications, fast spread on a large area is required to avoid coagulation and non-uniform component spread. In this work, we have developed a filter paper-based device to resolve this spreading challenge. We sandwich the filter paper between a matrix of nanofibrous membrane backed by polyethylene terephthalate (PET) sheets, forming a multi-scale porous network: one within the filter paper and the other between the PET sheet and the filter paper. By doing so, we decrease the overall resistance to flow while maintaining the same capillary suction pressure to obtain a quick, uniform spread of dyed liquids, milk solutions, and whole blood. The device design and concepts used here can be used in paper microfluidic applications and to develop devices for dried blood spot analysis, which utilize this fast flow while maintaining even spreading over a large area.

Item Type:	Journal Article
Publication:	Applied Physics Letters
Publisher:	American Institute of Physics Inc.
Additional Information:	The copyright of this article belongs to American Institute of Physics Inc.
Keywords:	Blood; Complex networks; Liquids; Paper; Plastic bottles; Porous materials, Biosensing applications; Capillary suction; Chemical and biological sensing; Dried blood spots; Micro fluidic applications; Nanofibrous membranes; Polyethylene terephthalates (PET); Porous substrates, Non Newtonian flow
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	08 Oct 2020 11:40
Last Modified:	08 Oct 2020 11:40
URI:	http://eprints.iisc.ac.in/id/eprint/66600

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