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3D Printed Parahydrophobic Surfaces as Multireaction Platforms.

Julio C Gaxiola-López1,2,3, Tania E Lara-Ceniceros1,2,3, Luis Gerardo Silva-Vidaurri3

  • 1Advanced Functional Materials & Nanotechnology Group, Av. Alianza Norte 202, Autopista Monterrey-Aeropuerto Km 10, PIIT, C.P. 66628 Apodaca, Nuevo León, Mexico.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 10, 2022
PubMed
Summary

Researchers created parahydrophobic surfaces (PHSs) using 3D printing and chemical modification. These novel surfaces enable controlled microdroplet reactions for applications in microfluidics and health monitoring.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Developing surfaces with tunable wettability is crucial for advanced applications.
  • Controlling surface properties at the micro- and nano-scale presents significant challenges.

Purpose of the Study:

  • To systematically fabricate parahydrophobic surfaces (PHSs) with controlled wettability using a 3D printer.
  • To investigate the influence of geometric parameters and surface chemistry on surface properties.
  • To demonstrate the potential of these surfaces as platforms for microdroplet reactions.

Main Methods:

  • Fabrication of cubic micro-pillar arrays using stereolithographic 3D printing.
  • Surface modification with fluoroalkyl silane compounds to tune wettability.
  • Characterization using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDAX), and contact angle measurements.

Main Results:

  • Achieved parahydrophobic surfaces (contact angles >150°) with double-scale roughness in a single step.
  • Demonstrated that the ratio of pillar height (H) to pitch (P) influences wettability, aligning with theoretical models.
  • Successfully performed aqueous reactions (precipitation, complexation, nanoparticle synthesis) using microdroplets on the PHSs.

Conclusions:

  • 3D printing offers a versatile method for creating complex micro-structured surfaces with tunable wettability.
  • The developed PHSs show promise as micro-reaction platforms for diverse applications.
  • Control over surface geometry and chemistry is key to achieving desired hydrophobic properties.