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Updated: Apr 14, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Do solid-to-solid polymorphic transitions in DL-norleucine proceed through nucleation?

Joost A van den Ende¹, Mireille M H Smets, Daniël T de Jong

¹Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands. h.cuppen@science.ru.nl.

Faraday Discussions

|April 17, 2015

Summary

This summary is machine-generated.

DL-Norleucine undergoes a low-temperature phase transition between its beta and alpha forms. This transition is driven by cooperative bilayer movements over significant energy barriers, revealed through computational and experimental analysis.

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Area of Science:

Solid-state chemistry
Crystallography
Materials science

Background:

DL-Norleucine is a molecular crystal known to exhibit enantiotropic phase transitions.
The high-temperature alpha to gamma transition mechanism has been previously elucidated as nucleation and growth.

Purpose of the Study:

To investigate the low-temperature beta to alpha phase transition mechanism in DL-Norleucine.
To combine computational and experimental approaches for a comprehensive understanding of the transition.

Main Methods:

Molecular dynamics simulations to model the transition process.
Nudged elastic band calculations to determine energy barriers.
Experimental characterization of structural and energetic properties.

Main Results:

The structural and energetic properties of the beta and alpha phases are remarkably similar.
Simulations suggest the transition is governed by cooperative movements of molecular bilayers.
Relatively large energy barriers were identified for the transition process.

Conclusions:

The low-temperature beta to alpha phase transition in DL-Norleucine is characterized by cooperative bilayer motion.
Significant energy barriers play a crucial role in the transition dynamics.