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Preparation of Biopolymer Aerogels Using Green Solvents
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3D-Printed Interfacially Jammed Emulsion Aerogels.

Seyyed Alireza Hashemi1, Ahmadreza Ghaffarkhah1, Hadi Hosseini1

  • 1Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC V1V 1V7, Canada.

ACS Applied Materials & Interfaces
|August 21, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed novel emulsion gels for 3D printing ultralightweight porous structures. This technique enhances mechanical robustness and allows precise control over porosity and electromagnetic shielding properties.

Keywords:
3D-printingAerogelselectromagnetic interference shieldingemulsion gelsinterfacial complexation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Direct ink writing (DIW) of ultralightweight porous structures faces challenges in maintaining mechanical robustness, especially with low ink concentrations.
  • Creating complex geometries with desired properties requires advanced ink formulations with tunable rheological characteristics.

Purpose of the Study:

  • To address the limitations in 3D printing lightweight porous materials.
  • To develop a versatile emulsion gel system for high-resolution direct ink writing.
  • To achieve tunable mechanical properties and electromagnetic shielding in printed aerogels.

Main Methods:

  • Utilized interfacially jammed emulsion gels formed by electrostatic interactions between graphene oxide (GO) and cellulose nanocrystals (CNCs) with an oil-phase ligand.
  • Employed post-jamming ionic cross-linking with NaHCO3 to enhance ink viscoelasticity for DIW.
  • Manipulated post-annealing processes and concentrations to control porosity and material properties.

Main Results:

  • Achieved ultralow density aerogels (∼2.63 mg/cm3) with adjustable mechanical robustness (elastic modulus of 0.45 MPa).
  • Demonstrated control over macro- to micro-scale porosity and the ability to print complex geometries.
  • Tuned electromagnetic shielding effectiveness from 6791 to 19615 dB cm2/g.

Conclusions:

  • The developed emulsion gel system offers a versatile platform for 3D printing advanced lightweight porous materials.
  • The technique enables precise control over structural, mechanical, and electromagnetic properties of printed aerogels.
  • This approach holds significant potential for applications requiring tailored lightweight materials with specific functionalities.