Mechanochemically Triggered Conformational Reordering via Ion-Regulated Molecular Clutches in Nanoconfined Networks

Area of Science:

• Soft Matter Mechanics
• Materials Science
• Nanotechnology

Background:

• Reconciling molecular mobility and structural rigidity is a challenge in soft matter.
• Static nanoconfinement often leads to brittle failure by restricting chain dynamics.

Purpose of the Study:

• To demonstrate an ion-regulated dynamic confinement strategy to overcome the trade-off between mobility and rigidity.
• To explore the role of confined ions in energy dissipation under mechanical stress.

Main Methods:

• Utilized 1.5 nm 2D silicate galleries with intrinsic sodium ions (Na+).
• Investigated ion-regulated dynamic confinement under extreme mechanical stimuli.
• Theoretically computed local ordering and experimentally characterized bulk ordering and orientation angles.

Main Results:

• Sodium ions act as dynamic 'molecular clutches,' enabling rapid reconfiguration.
• Achieved high local ordering (~85%) and significant energy dissipation (68.68 J cm-3) at 90% compressive strain.
• The material sustained high compressive stress (380 MPa at 95% strain) without fragmentation, showing ~87.8% energy conversion efficiency.

Conclusions:

• Ion-mediated dynamic confinement offers a novel approach to designing materials with extreme energy dissipation capabilities.
• This strategy overcomes classical limitations in nanoconfined soft matter, enabling unprecedented mechanical performance.
• Highlights the potential of nanoconfined ion-mediated mechanochemistry for next-generation materials.