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Control Volume and System Representations01:16

Control Volume and System Representations

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Using Adhesive Patterning to Construct 3D Paper Microfluidic Devices
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Broad Tuning of Paper Microfluidic Properties by Covalent Surface Modification for Precise Flow Control and Sensing.

Canan Aksoy1,2, Ischa van Kesteren1, Han Zuilhof1,3

  • 1Laboratory of Organic Chemistry, Wageningen University, Helix Building 124, Stippeneng 4, Wageningen 6708 WE, the Netherlands.

ACS Applied Bio Materials
|April 17, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed modified paper for microfluidic paper-based devices (μPADs) to precisely control liquid flow. This innovation enhances on-site sensing and actuating capabilities for diverse analytical applications.

Keywords:
covalent functionalizationmicrofluidic paper-based analytical deviceson-site analytical devicespaper microfluidicspaper surface modificationpaper-based sensing

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Microfluidics

Background:

  • Microfluidic paper-based devices (μPADs) offer portable, lab-to-sample analysis via capillary-driven flow.
  • Precise flow control in paper microfluidics remains a significant challenge, limiting advanced functionalities.
  • Existing methods for flow control in paper are often difficult to integrate and precisely manage.

Purpose of the Study:

  • To develop a simple covalent modification method for cellulose paper to tune surface properties.
  • To introduce advanced functionality and precise flow control for paper microfluidic applications.
  • To demonstrate the potential of modified paper in on-site sensing and actuating devices.

Main Methods:

  • Covalent modification of cellulose paper using fatty acyl chlorides of varying chain lengths.
  • Characterization of modified paper using FTIR-ATR, static water contact angle, and capillary flow measurements (permeability, flow distance, flow rate).
  • Development of proof-of-concept devices for surface tension measurement, multistep valving, ethanol concentration determination, and liquid-liquid extraction.

Main Results:

  • Successful tuning of paper surface properties and capillary flow characteristics through covalent modification.
  • Demonstrated precise control over liquid flow based on surface tension and wickability.
  • Proof-of-concept devices showed effective application in surface tension measurement, multistep valving, ethanol sensing, and liquid-liquid extraction.

Conclusions:

  • Simple covalent modification of cellulose paper offers a versatile approach to enhance μPAD functionality.
  • Precisely controlled capillary flow enables advanced on-site analytical applications.
  • This method provides a pathway for developing more sophisticated and reliable paper-based sensing platforms.