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Concentration-Dependent Viscoelasticity of Poloxamer-Shelled Microbubbles
Hiraku Tabata1, Daisuke Koyama1, Mami Matsukawa1
1Faculty of Science and Engineering, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto610-0321, Japan.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 29, 2022
Summary
The adsorption of Pluronic F-68 surfactant influences microbubble oscillation. Higher surfactant concentrations significantly increase shell elasticity and viscosity, impacting medical ultrasound diagnostic applications.
Area of Science:
- Materials Science
- Acoustics
- Biophysics
Background:
- Microbubble oscillation during ultrasound is key for diagnostics.
- Shell properties, influenced by adsorption, affect bubble behavior.
- Limited research exists on adsorption conditions and shell viscoelasticity.
Purpose of the Study:
- Investigate microbubble oscillation with Pluronic F-68 surfactant.
- Analyze the relationship between surfactant adsorption and shell viscoelasticity.
- Determine the impact of Pluronic F-68 concentration on microbubble dynamics.
Main Methods:
- Studied microbubbles coated with Pluronic F-68 at equilibrium adsorption.
- Analyzed dilatational viscoelasticity from acoustic pulse attenuation.
- Used frequency domain analysis of acoustic pulse propagation.
Main Results:
- Sharp attenuation peaks observed below 2.0 × 10-2 mol L-1 Pluronic F-68.
- Peaks flattened at concentrations above 2.0 × 10-2 mol L-1.
- Shell elasticity and viscosity increased significantly around 2.0 × 10-2 mol L-1.
Conclusions:
- Pluronic F-68 adsorption conditions critically influence microbubble oscillation.
- Concentration-dependent viscoelastic changes affect bubble dynamics.
- Findings are relevant for optimizing microbubbles in medical ultrasound diagnostics.
