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Related Experiment Video

Updated: Jul 2, 2025

Using Adhesive Patterning to Construct 3D Paper Microfluidic Devices

Using Adhesive Patterning to Construct 3D Paper Microfluidic Devices

Published on: April 1, 2016

Polymer Imbibition Through Paper Strips.

Deep Kotak¹, Prajwal Kamath², Udita U Ghosh¹

¹Department of Chemical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, India.

Langmuir : the ACS Journal of Surfaces and Colloids

|February 29, 2024

Summary

This summary is machine-generated.

Polymer solutions alter capillary rise dynamics in paper microfluidics, introducing a viscous-dominated regime before gravity takes over. This transition depends on pore size and is influenced by the prewetting front.

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Area of Science:

Fluid dynamics
Materials science
Microfluidics

Background:

Liquid wicking and imbibition are crucial for paper microfluidic devices.
Understanding fluid behavior in porous media is essential for device design.

Purpose of the Study:

To investigate the impact of polymer solutions on capillary rise dynamics (CRD) in porous strips.
To elucidate the transition between viscous-dominated and gravity-dominated regimes.
To quantify prewetting front (PWF) dynamics and morphology.

Main Methods:

Capillary rise dynamics (CRD) experiments using deionized water and aqueous polymer solutions.
Comparison of fluid dynamics in porous substrates with varying pore diameters.
Quantification of prewetting front (PWF) dynamics and morphological characterization.

Main Results:

Polymer solutions introduce an intermediate viscous-dominated regime in CRD, preceding the gravity-dominated regime.
The transition to the gravity-dominated regime is dependent on the porous substrate's pore diameter.
The prewetting front (PWF) causes a delay in the transition from viscous to gravity-dominated flow.

Conclusions:

Fluid viscosity significantly influences capillary rise dynamics in paper microfluidics.
Porous substrate properties, specifically pore diameter, modulate the observed flow regimes.
Prewetting front dynamics are critical for understanding and predicting fluid transport in these systems.