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Production of Membrane-Filtered Phase-Shift Decafluorobutane Nanodroplets from Preformed Microbubbles
Published on: March 23, 2021
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Condensation phase diagrams for lipid-coated perfluorobutane microbubbles
Paul A Mountford1, Shashank R Sirsi, Mark A Borden
1Department of Mechanical Engineering, University of Colorado , Boulder, Colorado 80309, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|May 15, 2014
Summary
Researchers explored how to condense lipid-coated microbubbles into nanodrops. Longer lipid chains and higher temperatures promoted condensation, with lipid shells offering unique mechanical resistance, aiding nanodrop formulation for medical applications.
Area of Science:
- Physical Chemistry
- Materials Science
- Biophysics
Background:
- Microbubbles are widely used in medical imaging and drug delivery.
- Understanding the phase transitions of microbubbles is crucial for optimizing their applications.
- Lipid shells influence the stability and behavior of gas-filled microbubbles.
Purpose of the Study:
- To investigate the thermodynamic conditions for condensing lipid-coated microbubbles into nanodrops.
- To elucidate the physicochemical mechanisms governing microbubble condensation.
- To determine the role of lipid shell properties in these transitions.
Main Methods:
- Microbubbles of perfluorobutane with lipid shells were pressurized in a controlled environment.
- Experiments were conducted across a range of temperatures (5-75 °C).
- Temperature-pressure phase diagrams were constructed for varying lipid acyl chain lengths (C16-C24).
Main Results:
- Microbubbles underwent either dissolution or condensation into nanodrops under pressure.
- Longer acyl chain lipids and supersaturated media shifted dissolution to higher temperatures.
- Lipid shells exhibited a wrinkle-to-fold collapse, resisting dissolution and compression.
- Lipid shells imparted negative apparent surface tension, shifting the vapor-to-liquid transition to higher pressures.
Conclusions:
- Lipid shell properties significantly influence microbubble condensation and stability.
- The observed mechanical resistance of lipid shells is key to nanodrop formation.
- Findings support the design of vaporizable fluorocarbon nanodrops for diagnostic and therapeutic uses.
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