Design of ultrasonically-activatable nanoparticles using low boiling point perfluorocarbons

Area of Science:

• Biomaterials Science
• Medical Ultrasonics
• Nanotechnology

Background:

• Microbubbles are used in medical ultrasonics but have stability and size limitations.
• Phase-change contrast agents (PCCAs) offer a potential alternative with improved characteristics.
• PCCAs utilize perfluorocarbons (PFCs) that transition from liquid to gas upon acoustic stimulation.

Purpose of the Study:

• To investigate the custom design of PCCAs for enhanced stability and acoustic sensitivity.
• To explore the relationship between PFC properties, size, thermal stability, and ultrasound sensitivity.
• To demonstrate the potential of low boiling point PFCs for activatable agents.

Main Methods:

• Custom design of PCCAs by tuning perfluorocarbon (PFC) properties.
• Investigating the relationship between PFC boiling point, ambient temperature, droplet size, thermal stability, and ultrasound sensitivity.
• Generating and characterizing stable droplets from low boiling point PFCs, including octafluoropropane.

Main Results:

• Established relationships between PFC properties and PCCA performance parameters.
• Demonstrated that stable droplets can be formed from very low boiling point PFCs.
• Identified lower acoustic energy requirements for vaporizing novel PFC-based PCCAs.
• Showcased the ability to tune emulsion stability and sensitivity by mixing PFCs.

Conclusions:

• Low boiling point perfluorocarbons represent a promising class of compounds for activatable ultrasound contrast agents.
• PCCAs can be tailored for specific medical ultrasonic applications by adjusting their design parameters.
• Novel PFC-based PCCAs offer enhanced stability and sensitivity for improved diagnostic imaging.