Inertial cavitation at the nanoscale.
Our group has recently developed novel nano-sized drug carriers that spatially target a tumor and release their payload in the presence of ultrasound-induced inertial cavitation. To maximize drug release and distribution within the tumor, co-localization of the drug carrier and cavitation nuclei is...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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2013
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| _version_ | 1826284314662273024 |
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| author | Kwan, J Graham, S Coussios, C |
| author_facet | Kwan, J Graham, S Coussios, C |
| author_sort | Kwan, J |
| collection | OXFORD |
| description | Our group has recently developed novel nano-sized drug carriers that spatially target a tumor and release their payload in the presence of ultrasound-induced inertial cavitation. To maximize drug release and distribution within the tumor, co-localization of the drug carrier and cavitation nuclei is necessary. We have recently demonstrated that rough-patterned silica nanoparticles can reduce inertial cavitation thresholds to clinically relevant levels, and will extravasate in tumors alongside the liposomes by virtue of their size. We now report on the underlying mechanisms that these nanoparticles, which are orders of magnitude smaller than the acoustic wavelength, can instigate inertial cavitation. The rough surface of the nanoparticle is modelled as a plane with a crevasse that traps a nanobubble. Using this model, we predict the motion of a gas bubble as it emerges from the cavity in response to the compressional and rarefactional ultrasonic pressures. We show that cavitation occurs when the nanobubble breaks free from the surface, growing unstably before collapsing during the compressional half cycle of the acoustic wave. Calculations show that a nanoscaled cavity greatly reduces the cavitation threshold across all frequencies and geometries studied. In addition, cavitation thresholds nonlinearly decrease with increasing cavity size. |
| first_indexed | 2024-03-07T01:11:59Z |
| format | Journal article |
| id | oxford-uuid:8d53cab6-da5a-496f-a67b-2a9c6bb88dd5 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:11:59Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | oxford-uuid:8d53cab6-da5a-496f-a67b-2a9c6bb88dd52022-03-26T22:50:38ZInertial cavitation at the nanoscale.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8d53cab6-da5a-496f-a67b-2a9c6bb88dd5EnglishSymplectic Elements at Oxford2013Kwan, JGraham, SCoussios, COur group has recently developed novel nano-sized drug carriers that spatially target a tumor and release their payload in the presence of ultrasound-induced inertial cavitation. To maximize drug release and distribution within the tumor, co-localization of the drug carrier and cavitation nuclei is necessary. We have recently demonstrated that rough-patterned silica nanoparticles can reduce inertial cavitation thresholds to clinically relevant levels, and will extravasate in tumors alongside the liposomes by virtue of their size. We now report on the underlying mechanisms that these nanoparticles, which are orders of magnitude smaller than the acoustic wavelength, can instigate inertial cavitation. The rough surface of the nanoparticle is modelled as a plane with a crevasse that traps a nanobubble. Using this model, we predict the motion of a gas bubble as it emerges from the cavity in response to the compressional and rarefactional ultrasonic pressures. We show that cavitation occurs when the nanobubble breaks free from the surface, growing unstably before collapsing during the compressional half cycle of the acoustic wave. Calculations show that a nanoscaled cavity greatly reduces the cavitation threshold across all frequencies and geometries studied. In addition, cavitation thresholds nonlinearly decrease with increasing cavity size. |
| spellingShingle | Kwan, J Graham, S Coussios, C Inertial cavitation at the nanoscale. |
| title | Inertial cavitation at the nanoscale. |
| title_full | Inertial cavitation at the nanoscale. |
| title_fullStr | Inertial cavitation at the nanoscale. |
| title_full_unstemmed | Inertial cavitation at the nanoscale. |
| title_short | Inertial cavitation at the nanoscale. |
| title_sort | inertial cavitation at the nanoscale |
| work_keys_str_mv | AT kwanj inertialcavitationatthenanoscale AT grahams inertialcavitationatthenanoscale AT coussiosc inertialcavitationatthenanoscale |