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Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Maintaining Shell Disorder with Kinked or Branched Ligands Stabilizes Apolar Nanoparticles
Tobias Valentin Knapp1, Setare Dodange2, Debora Monego2
1INM─Leibniz Institute for New Materials, Campus D2 2, Saarbrücken 66123, Germany.
ACS Nano
|September 26, 2025
Summary
Nonlinear ligands enhance nanoparticle stability by preventing ordered packing, maintaining shell disorder. This molecular mechanism significantly increases colloidal dispersion stability across wide temperature ranges.
Area of Science:
- Materials Science
- Colloid Science
- Nanotechnology
Background:
- Stable nanoparticle colloids are crucial for diverse applications.
- Nonlinear ligands improve nanoparticle stability in apolar solvents compared to linear chains.
Purpose of the Study:
- To elucidate the molecular origin of enhanced colloidal stability conferred by nonlinear ligands.
- To understand how ligand structure influences nanoparticle shell ordering and dispersion stability.
Main Methods:
- Temperature-dependent X-ray scattering experiments.
- Molecular dynamics simulations.
- Analysis of ligand shell structure and nanoparticle interactions.
Main Results:
- Even single methyl side chains disrupt ligand shell ordering, suppressing disorder-order transitions.
- Double bonds or branching in ligands drastically lower agglomeration temperatures.
- Ligand disorder prevents ordered bundling, maintaining shell disorder near solvent freezing.
- Enhanced stability is attributed to weakened inter-ligand attractions (energetic and entropic factors).
Conclusions:
- Structural modifications in ligands (branching, unsaturation) are key to preventing ordered packing.
- Disordered ligand shells enhance colloidal stability by over 100 K compared to linear ligands.
- Provides a molecular explanation for improved stability with nonlinear ligands, enabling engineered nanoparticle dispersions.
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