Mechanosensitive Gold Colloidal Membranes Mediated by Supramolecular Interfacial Self-Assembly

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Nanotechnology

Background:

• Biological organisms respond to mechanical stimuli, a property less observed in artificial systems.
• Cellular mechanosensation converts external mechanical forces into biochemical signals via molecular changes.
• Artificial colloidal systems lack the dynamic mechanical responsiveness seen in biological membranes.

Purpose of the Study:

• To create an artificial gold nanoparticle-discrete π-conjugated molecule hybrid system.
• To mimic the mechanical behavior and responsiveness of biological membranes.
• To develop a reversible colloidal membrane controlled by mechanical stimuli.

Main Methods:

• Rational design of a π-conjugated thiolated molecule for controlled gold nanoparticle (Au NP) clustering.
• Utilizing reversible, cooperative non-covalent interactions (π-π, solvophobic, hydrogen bonding) for self-assembly.
• Employing a supramolecular surface-pressure-controlled strategy for dynamic mechanical stimulus.

Main Results:

• Achieved controlled and reversible self-assembly of Au NP-molecule hybrids into colloidal clusters or membranes.
• Demonstrated reversible entrapment and release of aromatic guest molecules by the Au NP membranes.
• Showcased the system's response to dynamic mechanical stimuli (compression-expansion), analogous to cellular mechanosensitive channels.

Conclusions:

• The hybrid system represents the first example of a reversible colloidal membrane responsive to mechanical force.
• The developed supramolecular surface-pressure-controlled strategy offers a new method for dynamic mechanical control.
• This approach holds significant potential for advancing colloidal assemblies across diverse research areas.