Molecular ratchets - verification of the principle of detailed balance

TL;DR

This paper discusses the verification of the detailed balance principle in molecular ratchets, analyzing recent experiments and proposing new tests involving asymmetric ratchets and temperature variations to explore their thermodynamic behavior.

Contribution

It provides a critical analysis of recent experimental validation of detailed balance in molecular ratchets and proposes novel experimental approaches to further test this principle.

Findings

Recent experiments support the second law of thermodynamics.

The principle of detailed balance is consistent with observed molecular ratchet behavior.

Proposed experiments could provide deeper insights into ratchet thermodynamics.

Abstract

We argue that the recent experiments of Kelly et. al.(Angew. Chem. Int. Ed. Engl. 36, 1866 (1997)) on molecular ratchets, in addition to being in agreement with the second law of thermodynamics, is a test of the principle of detailed balance for the ratchet. We suggest new experiments, using an asymmetric ratchet, to further test the principle. We also point out methods involving a time variation of the temperature to to give it a directional motion.