Heat Transport in Photothermal Microscopy: Newton vs Fourier
Heat Transport in Photothermal Microscopy: Newton vs Fourier
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光热显微镜中的热传输:牛顿与傅立叶
DOI:
10.1021/acs.jpcc.3c07022
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发表时间:
2024
期刊:
影响因子:
--
通讯作者:
Narayan, Onuttom
中科院分区:
文献类型:
--
作者:
Samolis, Panagis;Hong, Mi K.;Rajagopal, R.;Sander, Michelle Y.;Erramilli, Shyamsunder;Narayan, Onuttom
Technological breakthroughs in photothermal microscopy have led to new discoveries in thermal transport at the cellular level. In the linear regime, heat transport is governed by the well-understood parabolic partial differential heat equation and its many extensions, with antecedents dating back to Fourier. The relaxation of the temperature from a point impulsive source of heat in a homogeneous medium inddimensions is scale free and asymptotically follows a power law decay in time ∼t–d/2. It is therefore interesting that many recent experiments have used Newton’s law of cooling, an ordinary differential equation that yields exponential decays with a single time constant. We show that the observed apparent exponential decays in photothermal microscopy are set by externalities such as the sample cell design, experimental finite excitation pulse width, and spatial resolution and should still contain a power law prefactor. Combining analytical methods that include exact results and asymptotic analysis with experiments and numerical simulations, we show that the conditions for the emergence of Newton’s law of cooling are often not satisfied in experiments. These need to be reinterpreted to be consistent with the underlying Fourier theory at the microscopic subcellular length scales, taking into consideration the interfacial thermal conductance or equivalently the inverse Kapitza resistance at interfaces.
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DOI:
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发表时间:
2023
期刊:
Ultrafast Nonlinear Imaging and Spectroscopy XI
影响因子:
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DOI:
--
发表时间:
2023
期刊:
影响因子:
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作者:
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