Metastable States of small-molecule solutions

Area of Science:

• Physical Chemistry
• Materials Science
• Soft Matter Physics

Background:

• Metastable states like gels and glasses are prevalent in nanoparticle suspensions and utilized in various products.
• These states in nanoparticle suspensions are often modeled using fluid dynamics with hard cores and short-range attractions.
• Recent work shows equilibrium solubilities of small molecules and nanoparticles align on a corresponding-states curve, implying similar solubilities for comparable attraction strengths.

Purpose of the Study:

• To investigate the existence of metastable states in small-molecule solutions.
• To determine if models used for nanoparticle suspensions can describe metastable states in small molecules.
• To confirm the hypothesis that metastable states in small molecules occur under similar conditions as in nanoparticle suspensions.

Main Methods:

• Exploration of theoretical models applicable to both nanoparticle suspensions and small-molecule solutions.
• Analysis of solubility data for small hydrogen-bonding molecules and nanoparticles.
• Experimental investigation into the conditions favoring metastable states in small-molecule solutions.

Main Results:

• Evidence suggesting that small-molecule solutions can exhibit metastable states.
• Confirmation that theoretical frameworks for nanoparticle suspensions can be extended to small molecules.
• Identification of conditions under which metastable states emerge in small-molecule systems.

Conclusions:

• Metastable states are not exclusive to nanoparticle suspensions and can be found in small-molecule solutions.
• The concept of corresponding-states solubility extends to the conditions governing metastable states.
• Further research into small-molecule metastable states can leverage insights from colloidal science.