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Contrast-Enhanced Subharmonic Aided Pressure Estimation SHAPE Using Ultrasound Imaging with a Focus on Identifying Portal Hypertension
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Shape-Directed Microspinners Powered by Ultrasound.
Syeda Sabrina, Mykola Tasinkevych1, Suzanne Ahmed
1Centro de Fisica Teórica e Computacional, Departamento de Fisica, Faculdade de Ciências , Universidade de Lisboa , Campo Grande P-1749-016 Lisboa , Portugal.
ACS Nano
|March 17, 2018
Summary
Engineered microparticle shapes enable precise control of ultrasonic propulsion. This research demonstrates how particle design dictates motion for advanced colloidal manipulation.
Area of Science:
- Acoustofluidics
- Colloidal science
- Nanotechnology
Background:
- Ultrasound propulsion offers remote manipulation of micro- and nanoparticles.
- Current understanding of acoustic propulsion mechanisms and energy transduction is limited.
- Controlling complex particle motions via ultrasound requires further investigation.
Purpose of the Study:
- To demonstrate rational engineering of colloidal particle shape for directed ultrasonic motion.
- To investigate the relationship between particle geometry and acoustic propulsion dynamics.
- To provide a framework for designing microparticles with complex ultrasound-driven movements.
Main Methods:
- Fabrication of gold microplates with twisted star (Cnh symmetry) shapes.
- Experimental study of particle dynamics in a megahertz acoustic field.
- Hydrodynamic simulations of steady streaming flows and particle motion.
Main Results:
- Systematic perturbation of particle shape directly influenced rotational motion.
- Experimental observations were accurately reproduced by hydrodynamic simulations.
- Quantified the correlation between specific particle geometries and induced movements.
Conclusions:
- Colloidal particle shape is a key factor in controlling ultrasound-actuated motion.
- Rational shape engineering can direct microparticle dynamics for tailored applications.
- This work paves the way for designing sophisticated acoustically propelled colloids.
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