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Microbubbles stabilized by a surfactant or polymer coating are already in clinical use as ultrasound imaging contrast agents. They have also been widely investigated as vehicles for drug delivery and gene therapy that can be tracked and triggered using ultrasound. Extensive studies have been made of the effects of the coating material and gas core on microbubble characteristics, but the influence of the fabrication method has received less attention. The aim of this study was to compare the behavior of microbubbles prepared using different techniques. Phospholipid-coated microbubbles were produced using sonication, electrospraying, or in a specially designed microfluidic device. The microbubbles were observed using optical, electron, and fluorescence lifetime imaging microscopy (FLIM) to interrogate their surface microstructure and stability over time. Their acoustic response was then determined in a flow chamber by detecting the pressure scattered from individual microbubbles as they passed through the focal region of a transducer (center frequencies 1, 2.25, and 3.5 MHz; peak negative pressures 50-300 kPa). The method of bubble generation was found to significantly affect the bubble surface characteristics, stability, and acoustic response. The results demonstrate that the processing method affects not only the bubble size distribution but other characteristics important for biomedical applications.

Original publication

DOI

10.1121/1.4805275

Type

Conference paper

Publication Date

05/2013

Volume

133

Addresses

Dept. of Eng. Sci., Univ. of Oxford, Inst. of Biomedical Eng., Old Rd. Campus, Headington, Oxford OX3 7DQ, United Kingdomgraciela.mohamedi@eng.ox.ac.uk.