New Evidence about the Spontaneous Symmetry Breaking: Action of an Asymmetric Weak Heat Source

The Journal of Physical Chemistry. B
Placido MineoNorberto Micali

Abstract

In the present study, we show how, in a stagnant water solution of uncharged aggregated achiral porphyrin-based molecules, a mirror-symmetry breaking (SB) can be induced and controlled by means of a weak asymmetric thermal gradient. In particular, it is shown that the optical activity of the aggregate porphyrin solution can be generated and reversed, in sign, only acting on the thermal ramp direction (heating or cooling). In order to avoid data misinterpretation, the aggregate structure modifications with the temperature change and the linear dichroism contribution to circular dichroism spectra were evaluated. A model simulation, using a finite element analysis approach describing the thermal flows, shows that small thermal gradients are able to give rise to asymmetric heat flow. The results reported here can be considered new evidence about the spontaneous symmetry breaking phenomenon induced by very weak forces having an important role in the natural chiral selective processes.

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Citations

Jan 21, 2017·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Josep M RiboJoaquim Crusats
Nov 2, 2016·Chemical Communications : Chem Comm·A Di MauroR Purrello
Dec 7, 2018·Physical Chemistry Chemical Physics : PCCP·Andrea Gardin, Alberta Ferrarini

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