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Related Concept Videos

Thermosensation01:43

Thermosensation

Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...

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A molecular thermometer for nanoparticles for optical hyperthermia.

Stefano Freddi1, Laura Sironi, Rocco D'Antuono

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We developed a sensitive all-optical method to measure nanoparticle temperature. Gold nanostars are highly efficient for localized hyperthermia applications.

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Area of Science:

  • Nanotechnology
  • Biomedical Optics
  • Materials Science

Background:

  • Accurate temperature measurement is crucial for nanoparticle-based therapies.
  • Localized hyperthermia requires precise control and monitoring of temperature.
  • Existing methods for nanoparticle temperature sensing have limitations.

Purpose of the Study:

  • To develop a novel all-optical method for measuring temperature on nanoparticles.
  • To assess the temperature-sensing capabilities of gold nanorods, gold nanostars, and magnetite nanoparticles.
  • To compare the hyperthermia-inducing efficiency of different nanoparticle types.

Main Methods:

  • An all-optical technique was employed, utilizing Rhodamine B as a temperature-sensitive probe.
  • The excited state lifetime of Rhodamine B was monitored near nanoparticle surfaces.
  • Near-infrared and radiofrequency excitation were used to induce heating.

Main Results:

  • High temperature sensitivity of 0.029 ± 0.001 ns/°C was achieved.
  • Low measurement uncertainty of ±0.3 °C was demonstrated.
  • Gold nanostars exhibited superior hyperthermia efficiency, being ~3x and ~100x more effective than gold nanorods and magnetite nanoparticles, respectively.

Conclusions:

  • The developed all-optical method provides a sensitive and accurate way to measure nanoparticle temperature.
  • Gold nanostars are promising candidates for efficient localized hyperthermia.
  • This technique can advance the development of targeted thermal therapies.