Shedding Light on Thermally Induced Optocapacitance at the Organic Biointerface,The Journal of Physical Chemistry B

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Shedding Light on Thermally Induced Optocapacitance at the Organic Biointerface
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2021-09-15 , DOI: 10.1021/acs.jpcb.1c06054
Gaia Bondelli _{1,

2} , Samim Sardar ₂ , Greta Chiaravalli _{1,

2} , Vito Vurro ₂ , Giuseppe Maria Paternò ₂ , Guglielmo Lanzani _{1,

2} , Cosimo D'Andrea _{1,

2}

Affiliation

Photothermal perturbation of the cell membrane is typically achieved using transducers that convert light into thermal energy, eventually heating the cell membrane. In turn, this leads to the modulation of the membrane electrical capacitance that is assigned to a geometrical modification of the membrane structure. However, the nature of such a change is not understood. In this work, we employ an all-optical spectroscopic approach, based on the use of fluorescent probes, to monitor the membrane polarity, viscosity, and order directly in living cells under thermal excitation transduced by a photoexcited polymer film. We report two major results. First, we show that rising temperature does not just change the geometry of the membrane but indeed it affects the membrane dielectric characteristics by water penetration. Second, we find an additional effect, which is peculiar for the photoexcited semiconducting polymer film, that contributes to the system perturbation and that we tentatively assigned to the photoinduced polarization of the polymer interface.

中文翻译：

揭示有机生物界面的热诱导光电容

细胞膜的光热扰动通常是使用将光转化为热能、最终加热细胞膜的换能器来实现的。反过来，这导致膜电容的调制，该调制分配给膜结构的几何修改。然而，这种变化的性质尚不清楚。在这项工作中，我们采用全光学光谱方法，基于荧光探针的使用，在光激发聚合物膜转导的热激发下直接监测活细胞中的膜极性、粘度和顺序。我们报告了两个主要结果。首先，我们表明升高的温度不仅会改变膜的几何形状，而且确实会通过水渗透影响膜的介电特性。第二，

更新日期：2021-09-30

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