Pressure and Composition Effects on a Common Nanoparticle Ligand-Solvent Pair.

Area of Science:

• Materials Science
• Physical Chemistry
• Nanotechnology

Background:

• Investigating pressure effects on nanoparticles is crucial.
• Interactions between nanoparticle ligands and solvents under pressure are often overlooked.
• 1-dodecanethiol and toluene are common model systems.

Purpose of the Study:

• To investigate the influence of toluene on the pressure-induced phase transitions of 1-dodecanethiol.
• To understand how ligand concentration affects these pressure-induced changes.
• To highlight the importance of solvent-ligand interactions in high-pressure nanoparticle research.

Main Methods:

• Vibrational spectroscopy was employed to study 1-dodecanethiol and toluene mixtures under varying pressures.
• Different concentrations of 1-dodecanethiol in toluene were analyzed.

Main Results:

• Toluene alters the pressure-induced phase transition of 1-dodecanethiol.
• At near-equal concentrations, phase segregation occurs, with 1-dodecanethiol crystallizing independently.
• At unequal concentrations, concerted phase transitions are observed, maintaining a disordered dodecanethiol conformation at higher pressures.

Conclusions:

• Solvent presence significantly modifies ligand behavior under pressure.
• Concentration-dependent interactions are key to understanding nanoparticle ligand-solvent systems.
• These findings are vital for designing accurate high-pressure nanoparticle experiments.