Sequential quenching of randomly deposited ellipsoids: anisotropy and spatial patterns

Area of Science:

• Physics
• Materials Science
• Computational Chemistry

Background:

• Understanding particle self-assembly is crucial for designing advanced materials.
• The anisotropic nature of ellipsoidal particles presents unique challenges in predicting their assembly behavior.

Purpose of the Study:

• To investigate the sequential quenching and alignment of prolate ellipsoids on a homogeneous surface.
• To analyze the influence of temperature and a key attraction parameter (lambda) on particle orientation.

Main Methods:

• Development of a novel pair potential incorporating hard ellipse repulsion and orientation-dependent r-6 attraction.
• Utilizing radial distribution functions (g(r)) and orientational correlation functions (G(r)) to quantify particle arrangements.
• Simulating systems with varying lambda values (0.10, 2.19, 3.5) and temperatures.

Main Results:

• The parameter lambda significantly impacts the relative strength of side-by-side versus end-to-end attractions, governing particle alignment.
• Lower temperatures promote longer-range orientational correlations.
• A higher lambda value (3.5) results in a greater degree of orientational order compared to lower values (2.19 and 0.10).

Conclusions:

• The study demonstrates that controlling inter-particle attraction parameters and temperature allows for tunable alignment of ellipsoidal particles.
• Findings provide insights into the self-assembly mechanisms of anisotropic particles, relevant for soft matter and nanotechnology.