Release of engineered nanomaterials from polymer nanocomposites: diffusion, dissolution, and desorption

Area of Science:

• Materials Science
• Environmental Science
• Toxicology

Background:

• Polymer nanocomposites are used in diverse applications, from packaging to medical devices.
• Potential release of nanofillers from these materials necessitates risk assessment for human health and the environment.

Purpose of the Study:

• To review the scientific understanding of engineered nanomaterial (ENM) release from polymer nanocomposites.
• To focus on the paradigm of ENM release via passive diffusion, desorption, and dissolution into liquid media.

Main Methods:

• Overview of polymer-liquid interactions and diffusion physics.
• Summary of experimental and theoretical methods for assessing contaminant release from polymers.
• Critical review of existing literature on ENM release mechanisms.

Main Results:

• Discusses basic polymer-liquid interactions and diffusion principles relevant to ENM release.
• Summarizes methodologies for studying ENM release through diffusion, dissolution, and desorption.
• Critically evaluates the current body of research on these ENM release pathways.

Conclusions:

• Highlights knowledge gaps and future research needs in understanding ENM release from polymer nanocomposites.
• Emphasizes the importance of studying passive release mechanisms for risk assessment.