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Polar steric interactions for V-shaped molecules.

Fulvio Bisi¹, Riccardo Rosso, Epifanio G Virga

¹Dipartimento di Matematica and CNISM, Università di Pavia, Via Ferrata 1, Pavia, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|September 4, 2008

Summary

Polar shape interactions in V-shaped particles unexpectedly favor antiparallel binding. This steric interaction is crucial for building ordered phases in three dimensions, potentially leading to antiferroelectric smectic ordering.

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Area of Science:

Soft Matter Physics
Materials Science
Physical Chemistry

Background:

Understanding particle interactions is key to predicting material properties.
Polar interactions and particle shape influence self-assembly.
Excluded-volume effects are fundamental in condensed matter systems.

Purpose of the Study:

To investigate the impact of shape polarity on excluded-volume interactions.
To analyze the role of polar steric interactions in V-shaped particles.
To explore the formation of orientationally ordered phases.

Main Methods:

Theoretical analysis of V-shaped polar particles.
Modeling excluded-volume interactions in ordered phases.
Investigating pair binding and phase formation mechanisms.

Main Results:

Polar steric interactions become significant in three dimensions.
Unexpected antiparallel pair binding is favored by polar interactions.
This mechanism can lead to orientationally ordered phases.

Conclusions:

Neglected polar steric interactions are essential for understanding polar particle ordering.
Antiparallel binding is a potential building block for ordered phases.
Antiferromorphic smectic and antiferroelectric ordering may arise from these interactions.