研究目的
Investigating the effects of seeded polymer nanoparticles and strong photo energy absorption on cavitation production at the air/water interface using a CO2 laser, and exploring the correlation among cavitation, nanoparticles, and temperature.
研究成果
The study demonstrates that nanoparticles not only act as preexisted nuclei to promote nucleation for cavitation but also likely affect temperature to change the nucleation rate. A novel core-shell cavitation was demonstrated by exploiting a compound hexane/water interface. This approach offers opportunities to control cavitations by choosing nanoparticles and designing interfaces, operating at a lower laser intensity, for applications in material science and medical surgery.
研究不足
The limited frame rates of the thermal camera constrained the capability to capture the highest temperature during the fast process of cavitation. The exact mechanism of the transition to pseudo-cavitation at higher nanoparticle concentrations is not fully understood.
1：Experimental Design and Method Selection:
A continuous-wave CO2 laser was impacted on water in a glass cuvette to produce cavitation at the air/water interface. High-speed and thermal cameras were used to observe the cavitation dynamics and temperature distribution.
2：Sample Selection and Data Sources:
Water samples with varying concentrations and sizes of polymer nanoparticles were prepared. The cavitation dynamics and temperature profiles were recorded.
3：List of Experimental Equipment and Materials:
CO2 laser (Access laser, AL30D), high-speed camera (Phantom V611), thermal camera (FLIR A 6750sc), glass cuvette, polymer nanoparticles (ThermoFisher Scientific, polystyrene).
4：Experimental Procedures and Operational Workflow:
The laser beam was irradiated downward into the glass cuvette containing water with seeded nanoparticles. The cavitation process was visualized using high-speed photography, and the temperature distribution was measured with a thermal camera.
5：Data Analysis Methods:
The dynamics of cavitation and the spatiotemporal evolution of temperature were analyzed to reveal the correlation among cavitation, nanoparticles, and temperature.
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