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Related Concept Videos

Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...

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Updated: Jul 7, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Photothermal phase-shift spectroscopy in a flowing medium: experiment.

M Soltanolkotabi, R Gupta

    Applied Optics
    |February 28, 2008
    PubMed
    Summary

    Photothermal phase-shift signals were observed in flowing media. These experimental results align with established theoretical predictions for this phenomenon.

    Area of Science:

    • Physics
    • Fluid Dynamics
    • Thermodynamics

    Background:

    • Photothermal phenomena involve light absorption and subsequent heat generation.
    • Phase shifts in signals can provide insights into material properties and dynamic processes.
    • Understanding signal behavior in flowing media is crucial for various applications.

    Purpose of the Study:

    • To investigate photothermal phase-shift signals in a dynamic, flowing medium.
    • To compare experimental observations with theoretical models.

    Main Methods:

    • Utilized a flowing medium subjected to controlled photothermal excitation.
    • Measured and analyzed the resulting phase-shift signals.

    Main Results:

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  • Successfully observed distinct photothermal phase-shift signals.
  • Experimental data demonstrated strong agreement with theoretical predictions.

    • Conclusions:

    • The study validates theoretical models for photothermal phase shifts in flowing systems.
    • Confirms the feasibility of using photothermal techniques to probe dynamic fluid environments.