Affine Deformation and Self-Assembly Alignment in Hydrogel Nanocomposites
Suellen Pereira Espíndola1, Ben Norder1, Kaspar M B Jansen2
1Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.
Macromolecules
|December 18, 2023
Summary
Researchers developed a new method for aligning 2D materials in bioinspired nanocomposites using a gel network. This approach enables precise control over material structure, enhancing mechanical and barrier properties even at high filler concentrations.
Area of Science:
- Materials Science
- Nanotechnology
- Bioinspired Materials
Background:
- Designing hierarchical bioinspired nanocomposites requires precise control over filler alignment.
- Solvent evaporation methods offer scalable routes to nacre-like materials but understanding 2D filler alignment mechanisms is challenging.
- Existing methods struggle to explain or control the orientation of nanosheets and platelets during fabrication.
Purpose of the Study:
- To explore pathways for achieving nanocomposite ordering using orientation distribution functions.
- To demonstrate the crucial role of 2D material immobilization via network formation in evaporation-induced alignment.
- To investigate a modified affine deformation model for describing evaporative fabrication methods.
Main Methods:
- Utilized orientation distribution functions to analyze nanocomposite ordering.
- Developed a modified affine deformation model to describe evaporative alignment processes.
- Employed a thermo-reversible gelatin/montmorillonite (MMT) gel system to rapidly immobilize MMT platelets for studying high loadings and aspect ratios.
Main Results:
- Demonstrated that gel network formation and immobilization of 2D materials are critical for alignment during solvent evaporation.
- Achieved a stable in-plane orientation (order parameter ⟨P2⟩ ≈ 0.7) across a wide range of nanofiller content (up to 64 vol%).
- Observed continuous improvements in mechanical strength and water vapor barrier properties with increasing MMT content.
Conclusions:
- The affine deformation strategy, facilitated by a gelling approach, is effective for creating highly aligned nanocomposites, even at very high filler loadings.
- This method offers simplicity, versatility, and scalability for fabricating advanced materials with tailored properties.
- The developed technique holds promise for next-generation material design, particularly for applications requiring enhanced mechanical and barrier performance.
