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Cavitation - Europe PMC

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Last Updated: 10 January 2023

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Treatment efficacy of low-dose 5-fluorouracil with ultrasound in mediating 5-fluorouracil-loaded microbubble cavitation in head and neck cancer.

The shortest loading efficiency of 5-FU on MBs was 19. 04 u00b1 0. 85 and 2. 00 gb1 0. 53 percent, respectively, with the maximum loading efficiency of 5-FU on MBs being 19. 04 %u00b1 0. 2 percent. Cell viabilities of 5-FU and 5-FU-MBs did not differ significantly in the in vitro study, but cell toxicity increased to 31% in the 5-FU-MBs + U. S. group, relative to the 5-FU-MBs treatment-alone group. The 5-FU levels of tumors in small animals were noticeably higher for the 5-FU-MBs + U. S. treatment than for either the 5-FU-MBs or 5-FU systemic treatment doses, according to the biodistribution findings. After 34 days of therapy, small-animal therapy, 2. 5 mg/kg 5-FU therapeutic IV doses injected into mice resulted in a more significant decrease in tumor growth in the 5-FU-MBs + U. S. group than in the control group.

Source link: https://europepmc.org/article/MED/36579479


An empirical experimental investigation on the effect of an external electric field on the behaviour of laser-induced cavitation bubbles.

This research is an attempt to empirically investigate laser-induced cavitation bubbles in the presence of an external electric field. The selection of the liquids was based on the assumption that the conductivity of the liquids would play a significant role in responding to the external electric field and thus dictate the behavior of the cavitation bubbles. The maximum radii of the cavitation bubbles increased in response to an increasing electric field, according to the study. Both cases had similar trends, as the bubble burst speeds and their energies were also measured. Using classical nucleation theory, the cavitation bubble dynamics were then extended to a Gilmore model and the NPs synthesized using laser ablation with and without an external electric field were estimated using classical nucleation methods.

Source link: https://europepmc.org/article/MED/36601990


Design of High-Entropy Alloy Coating for Cavitation Erosion Resistance by Different Energy-Induced Dynamic Cyclic Behaviors.

The controversy over the impact of cavitation heat on material surface of cavitation erosion mechanisms and limits the production of protective materials. Thus, the coating achieved simultaneous absorption of mechanical impact energy and thermal energy released by the bubble crack, while simultaneously avoiding crystal deposition and surface stability, with a CE resistance that was 2 times higher than that of classical AlCrCoFeNi HEA coating. This design idea of inducing various energy restraints or neutralization by surface microstructure's unique reaction patterns opens a whole new route to CE-resistant materials.

Source link: https://europepmc.org/article/MED/36595485


Degradation of magenta dye using cavitation-based transducers to glass marble: Lab to semi-pilot scale operations.

Initial studies such as the effect of initial dye concentration and catalyst loading of TiO 2 and MnO 2 and MnO 2 have been performed, followed by the effects of combined catalyst loading on the extent of degradation were found in 87. 1% and 68 percent, respectively, at a capacity of 3 L, respectively. The cost of a US/TiO 2 + MnO 2 treatment plan is very small, with U. S. 0. 01/L, whereas on a semi-pilot scale using HC/TiO 2 + MnO 2 , the cost is US 0. 04/L being the base. Using ultrasound and ultraviolet irradiation, a small-scale dye containing wastewater removal is used in wastewater treatment at a large scale plant. INTERITIONER POINTS : The use of catalysts in small-scale operations with novel cavitation methods has been investigated for dye degradation.

Source link: https://europepmc.org/article/MED/36594542


Intravital imaging and cavitation monitoring of antivascular ultrasound in tumor microvasculature.

Rationale: In an effort termed antivascular ultrasound or nonthermal ablation, ultrasound-stimulated microbubbles have been shown to be capable of triggering blood flow inhibition and necrosis in a variety of tissue types. Methods: Ultrasound transmitters and receivers are embedded in a murine dorsal window chamber tumor model for intravital microscopy research that allows for real-time visual and acoustic monitoring during antivascular ultrasound. Conclusions: Vascular events occurred more often in tumor-affected vessels with higher incidence in smaller vessels and increased severity as a result of rising pressure. A combination of focal disruption events and network-related flow change caused the shutdown of vascular blood flow disruptions. Conclusions: The collected vascular events collected collectively with identified cavitation signatures lead to a more accurate mechanistic interpretation of antivascular ultrasound at the microscale, with the possibility of establishing a specific treatment protocol and control platform.

Source link: https://europepmc.org/article/MED/36593952


Synchrotron X-ray imaging of the onset of ultrasonic horn cavitation.

The cone formation is not immediate, according to the manufacturer, but results from a three-step phenomenology: inception and oscillation of single bubbles, individual cloud formation under split or lens effects, cloud mixing, leading to the emergence of a bubble layer and eventually to the cone structure due to the radial pressure gradient on the horn tip.

Source link: https://europepmc.org/article/MED/36599280


Wall wettability effect on process of collapse of single cavitation bubbles in near-wall region using pseudo-potential lattice Boltzmann method.

Our experiments reveal that wall wettability has a significant effect on near-wall cavitation of an order no less than the effect of the initial bubble distance. When the contact angle goes from the hydrophilic 53:u00b0 to the hydrophobic 113. u00b0, the lifetime of the bubble decreases by up to 50%, and the increase of the maximum micro-jet velocity and collapse pressure are up to 51% and 65% respectively. The impact pressure transmitted to the hydrophilic wall is of the same order as the maximum collapse pressure, but the impact speed is an order smaller than the maximum micro-jet speed. The relationship between the pressure difference and the severity of death also appears more consistent than we have expected, according to a logistic curve that is not limited by either the contact angle or the initial bubble distance.

Source link: https://europepmc.org/article/MED/36619430


In situ measurement of cavitation damage from single bubble collapse using high-speed chronoamperometry.

In an aqueous NaCl solution near the surface of an aluminum sample, a single, laser-generated bubble is created. The corrosion current flow between the sample and a similar aluminum electrode immersed in the same solution is recorded by high-speed chronoamperometry. Using the corrosion current from the repassivation, it is possible to determine the cavitation damage in the nanometer thin passive layer of the aluminum surface. The bubble was not aggressive, and at long standing distances, and it was only detrimental during the second explosion, which occurs at the solid surface, at intermediate standoffs.

Source link: https://europepmc.org/article/MED/36566520


The effect of the combined system of Hydrodynamic Cavitation, Ozone, and Hydrogen Peroxide on the removal of Chlorophyll a and Organic substances in the raw water

Increasing nutrient levels and algal blooms can also result in drinking water problems in communities near dead zones and upstream. The purpose of this research is to investigate the effects of Hydrodynamic Cavitation, Ozone, and Hydrogen Peroxide on Chlorophyll a and Organic substances removal from the raw water entering the Sanandaj treatment plant. Total Organic Carbon can be removed most effectively under the following conditions: 5 bar of cavitation pressure, 90 min of retention time, a pH of 5, 1 m 3 h, and 2 gr/l Hydrogen Peroxide. Based on the percentage contributions of each factor, the most effective factor in the deposition of TOC and Chlorophyll was determined to be cavitation pressure.

Source link: https://europepmc.org/article/PPR/PPR584482


Hydrodynamic cavitation-enhanced photocatalytic activity of P-doped TiO 2 for degradation of ciprofloxacin: Synergetic effect and mechanism.

In comparison to a degradation ratio of 20. 37 percent in HC and 55. 7 % in P-TiO 2 -based photocatalytic processes alone, the CIP degradation ratio reached 90. 63 percent in HC-assisted photocatalytic processes with the correct experimental conditions. Using SEM, TEM, and BET analysis, mechanic microjets therapy originated from HC make P-TiO 2 nano photocatalysts with significant increased surface area, reduced particle sizes, cleaner surface, and improved dispersion.

Source link: https://europepmc.org/article/MED/36527763

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions