Lipid distribution and viscosity of coated microbubbles

Klazina Kooiman*, Marcia Emmer, Tom J.A. Kokhuis, Johan G. Bosch, H. Martijn De Gruiter, Martin E. Van Royen, W. A. Van Cappellen, Adriaan B. Houtsmuller, Antonius F.W. Van Der Steen, Nico De Jong

*Corresponding author for this work

Research output: Chapter/Conference proceedingConference proceedingAcademicpeer-review

11 Citations (Scopus)


Ultrasound contrast agents consist of gas-filled coated microbubbles with diameters between 1 and 10 m. Within an ultrasound field, high differences in responses of similar sized microbubbles have been reported. Heterogeneous coating properties have been suggested to be the underlying cause. Until now, properties of this coating, like viscosity have been studied dynamically using a set-up of vibrating microbubbles in an ultrasound field. This study focuses on determining the viscosity of the coating for lipid-coated microbubbles in a static set-up. The viscosity of the coating was determined by measuring the mobility of a fluorescent lipid using Fluorescence Recovery After Photobleaching (FRAP). We found a surface shear viscosity of 8106 kg/s that was independent of the microbubble size. In addition, we found that the lipid distribution in the coating was heterogeneous and varied from microbubble to microbubble. In conclusion, this study shows that the static surface shear viscosity of the coating can be determined in an independent way which can now be used in microbubble dynamics models.

Original languageEnglish
Title of host publication2010 IEEE International Ultrasonics Symposium, IUS 2010
Number of pages4
Publication statusPublished - 2010
Event2010 IEEE International Ultrasonics Symposium, IUS 2010 - San Diego, CA, United States
Duration: 11 Oct 201014 Oct 2010

Publication series

SeriesProceedings - IEEE Ultrasonics Symposium


Conference2010 IEEE International Ultrasonics Symposium, IUS 2010
Country/TerritoryUnited States
CitySan Diego, CA


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