278114 Laser Induced Photothermal Heating and Bubble Generation of Gold Nanoparticles

Tuesday, October 30, 2012
Hall B (Convention Center )
Ioannis H. Karampelas1 and Edward P. Furlani1,2, (1)Dept. of Chemical and Biological Engineering, University at Buffalo (SUNY), Buffalo, NY, (2)Dept. of Electrical Engineering, University at Buffalo (SUNY), Buffalo, NY

Laser Induced Photothermal Heating and Bubble Generation
of Gold Nanoparticles

I. H. Karampelas1 and E. P. Furlani1,2

1Dept. of Chemical and Biological Engineering, 2Dept. of Electrical Engineering
 University at Buffalo, SUNY, NY 14260 USA

In this study, we present an analysis of photothermal effects associated with nanosecond-pulsed, laser-illuminated gold nanoparticles immersed in aqueous solutions. We use combined computational electromagnetic and fluid analysis to model the fundamental aspects of this photothermal process. More specifically, we study energy conversion within the nanoparticles at plasmon resonance, heat transfer to the fluid, homogenous bubble nucleation and the dynamic behavior of the bubble and surrounding fluid. In addition, we demonstrate the theory via application to various nanoparticle geometries such as spheres, rods and tori. We show that process parameters such as laser intensity, pulse duration, wavelength, polarization and particle geometry can be tuned to control the size and behavior of nucleated bubbles. Moreover, we present results on multi-particle systems and demonstrate that cooperative heating allows for the generation of larger bubbles using significantly less energy as compared to single-particle systems. We discuss details of the modeling approach and specific applications including recent advances in photothermal tissue therapy at the cellular level.

 


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See more of this Session: Poster Session: Nanoscale Science and Engineering
See more of this Group/Topical: Nanoscale Science and Engineering Forum