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Effect of mechanical stirring on sonoluminescence and sonochemiluminescence.
Ultrason Sonochem
December 2024
Third Institute of Physics, Georg-August-University Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany. Electronic address:
Light emissions from cavitating liquids serve as a diagnostic tool for chemical activity, bubble collapse conditions, or excited species. Here we demonstrate the influence of mechanical stirring on sonoluminescence (SL) and sonochemiluminescence (SCL) emissions emerging in the presence of dissolved sodium salts and luminol in different sonicated liquids. In the systems investigated, driven in the 20-40 kHz range, stirring can change the spatial distribution of blue/white broadband SL emissions and of the orange sodium D-line emission, as well as their relative intensities.
View Article and Find Full Text PDFMass and heat transfer in audible sound driven bubbles.
Ultrason Sonochem
December 2024
International Centre for Theoretical Sciences, Tata Institute of Fundamental Research, Bengaluru 560089, India.
Article Synopsis
- Most research on sonoluminescence and sonochemistry focuses on frequencies above 20 kHz, leaving a gap in understanding bubble dynamics at audible frequencies.
- The study introduces a hybrid modeling approach that combines complex and simpler models to predict heat and mass transfer in bubbles influenced by sound at 17.8 kHz.
- Results show significant deviations between the models at lower frequencies, with the simpler model overestimating bubble size and trapped vapor but underestimating temperature and pressure, highlighting the need for more research in this frequency range.
Injectable Mechanophore Nanoparticles for Deep-Tissue Mechanochemical Dynamic Therapy.
ACS Nano
September 2024
Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States.
Photodynamic therapy (PDT) and sonodynamic therapy (SDT), using nonionizing light and ultrasound to generate reactive oxygen species, offer promising localized treatments for cancers. However, the effectiveness of PDT is hampered by inadequate tissue penetration, and SDT largely relies on pyrolysis and sonoluminescence, which may cause tissue injury and imprecise targeting. To address these issues, we have proposed a mechanochemical dynamic therapy (MDT) that uses free radicals generated from mechanophore-embedded polymers under mechanical stress to produce reactive oxygen species for cancer treatment.
View Article and Find Full Text PDFA review of sonodynamic therapy for brain tumors.
Neurosurg Focus
September 2024
3Department of Neurosurgery, Ninewells Hospital & Medical School, Dundee, United Kingdom.
Objective: Sonodynamic therapy (SDT) is gaining attention as a promising new noninvasive brain tumor treatment that targets and selectively kills tumor cells, with limited side effects. This review examines the mechanisms of SDT and ongoing clinical trials looking at optimization of sonication parameters for potential treatment of glioblastoma (GBM) and diffuse intrinsic pontine glioma (DIPG). The results in the first patient with recurrent GBM treated at the Mayo Clinic are briefly discussed.
View Article and Find Full Text PDFHybridization of Polymer-Encapsulated MoS-ZnO Nanostructures as Organic-Inorganic Polymer Films for Sonocatalytic-Induced Dye Degradation.
Polymers (Basel)
August 2024
School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
Article Synopsis
- The study focuses on creating a hybrid polymer composite film (PVDF/MoS-ZnO) to enhance the degradation of organic pollutants using environmentally friendly technology.
- The new composite exhibits a significant degradation efficiency of 97.23% for rhodamine B dye, compared to only 17.7% for the base polymer, due to improved electron-hole dynamics.
- The film shows good reusability and attributes its success to active species involved in the degradation process and the effective integration of ZnO onto MoS in the polymer matrix.
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