An Inbuilt Electronic Pawl Gates Orbital Information Processing and Controls the Rotation of a Double Ratchet Rotary...

Area of Science:

• Molecular Machines and Nanotechnology
• Physical Chemistry
• Supramolecular Chemistry

Background:

• Rotary motors typically require direct external energy input for rotation.
• Sustainable rotation often necessitates multiple energy sources.
• Exceptions exist, but the energy harvesting mechanisms are not fully understood.

Purpose of the Study:

• To investigate if double ratchet rotary motors (DRMs) can harvest thermal noise for rotation.
• To explore the role of an orbital-level information transport channel in DRM rotation control.
• To understand how functional moieties influence information processing and motor behavior.

Main Methods:

• Direct imaging of thermal noise movement using scanning tunneling microscopy (STM).
• Density functional theory (DFT) calculations.
• Variable-temperature 1H nuclear magnetic resonance (NMR) spectroscopy.
• Introduction of pawl-like functional moieties to modulate electronic environments.

Main Results:

• DRMs were observed to harvest power from thermal noise (kT) for sustainable rotation.
• STM successfully imaged thermal noise as dynamic orbital density.
• A vibrational information flow chain (VIFC) was identified as crucial for noise harvesting.
• Functional moieties altered proton intercalation, gating information flow and affecting rotational motion.

Conclusions:

• DRMs demonstrate a novel mechanism for rotation powered by ambient thermal noise.
• The vibrational information flow chain (VIFC) is a key factor in DRM noise harvesting and rotational control.
• Modulating electronic environments via functional groups offers a way to control DRM behavior.