Soft elasticity of RNA gels and negative Poisson ratio
Amir Ahsan, Joseph Rudnick, Robijn Bruinsma
TL;DR
This paper introduces a model explaining the soft elasticity and negative Poisson ratio in RNA gels, highlighting the role of non-Gaussian force relations and broken symmetry in producing anomalous elastic behaviors.
Contribution
It presents a novel theoretical model linking RNA molecular structure to macroscopic elastic anomalies like negative Poisson ratio.
Findings
RNA gels exhibit negative Poisson ratio due to non-Gaussian elasticity.
Broken rotational symmetry amplifies anomalous elastic effects.
Model predicts shape instabilities in RNA gels.
Abstract
We propose a model for the elastic properties of RNA gels. The model predicts anomalous elastic properties in the form of a negative Poisson ratio and shape instabilities. The anomalous elasticity is generated by the non-Gaussian force-deformation relation of single-stranded RNA. The effect is greatly magnified by broken rotational symmetry produced by double-stranded sequences and the concomitant soft modes of uniaxial elastomers.
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Taxonomy
TopicsBacteriophages and microbial interactions · RNA Research and Splicing · Supramolecular Self-Assembly in Materials