研究目的
To observe and characterize stimulated emissions from the gas-liquid interface in foams containing Rhodamine 6G and surfactant, and to understand the parameters influencing this phenomenon.
研究成果
The study successfully demonstrated stimulated emission at 595 nm from Rhodamine 6G-doped foam interfaces, highlighting the roles of liquid fraction, bubble gap, and laser angle. This has implications for light guiding and photocatalytic applications, suggesting future work on 3D structures for enhanced catalytic reactions.
研究不足
The stimulated emission is highly dependent on specific parameters such as laser incidence angle, gap between bubbles, and liquid fraction, which may limit generalizability. The use of reflective surfaces and controlled conditions might not be easily scalable for practical applications. Potential optimizations include exploring other dye-surfactant systems or varying environmental conditions.
1：Experimental Design and Method Selection:
The study involved preparing monodisperse bubble foams with controlled liquid fractions and gaps between bubbles. Stimulated emissions were induced using a 532 nm continuous wave laser at a specific angle, and emissions were analyzed using micro-photoluminescence, confocal microscopy, and time-resolved measurements.
2：Sample Selection and Data Sources:
Foams were prepared using polyoxyethylene (40) stearate and Rhodamine 6G in aqueous solutions, with liquid fractions ranging from
3：09 to 4 and bubble diameters from 20 to 250 μm. Data were collected from the interfaces between bubbles. List of Experimental Equipment and Materials:
Materials included polyoxyethylene (40) stearate, ethanol, Rhodamine 6G, de-ionized water, CO2 gas, quartz slides, and filters. Equipment included a micro-PL setup with a 532 nm argon-ion laser, confocal microscope (Nikon A1R), ICCD spectrometer (Princeton), fluorescence lifetime system (HORIBA Scientific DeltaFlex), and TEM for morphology.
4：Experimental Procedures and Operational Workflow:
Bubbles were generated using a T-shaped device with controlled flow rates. Foams were stabilized on quartz slides and excited with the laser at 45°. Emissions were collected through objectives, analyzed with MATLAB and ImageJ, and lifetime measurements were performed with TCSPC.
5：5°. Emissions were collected through objectives, analyzed with MATLAB and ImageJ, and lifetime measurements were performed with TCSPC. Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using customized algorithms in MATLAB for spectral intensity and image analysis, DAS6 software for lifetime fitting, and statistical methods to ensure reproducibility.
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fluorescence lifetime system
HORIBA Scientific DeltaFlex
HORIBA Scientific
Measuring fluorescence decay and lifetimes using time-correlated single photon counting
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argon-ion laser
532 nm continuous wave
Pumping the foam samples to induce stimulated emissions
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confocal microscope
Nikon A1R (Invert)
Nikon
Imaging the foam samples and measuring gaps between bubbles
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ICCD spectrometer
Princeton ICCD kinetic spectrometer
Princeton
Collecting and analyzing emission spectra from the foam samples
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dichroic filter
Filtering the laser beam in the experimental setup
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neutral density filter
variable
Adjusting the incident laser power
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objective
20x (N.A.0.4)
Collecting emitted signals in photoluminescence and confocal microscopy
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objective
50x (N.A.0.75)
Collecting emitted signals and measuring gaps in confocal microscopy
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optical fiber
Focusing emitted signals onto the spectrometer
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shutter
Blocking the pump beam except during exposure periods
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mirror
Increasing reflection in the experimental setup
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T-shaped device
Generating monodisperse bubbles by injecting solution and CO2 gas
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quartz slide
100 μm thick, custom size 20 mm x 20 mm
Supporting and confining the foam samples
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filter
0.2 μm
Removing solid residues and free particles from the solution
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