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Thermal Properties of Lipid Bilayers Determined Using Upconversion Nanothermometry

机译：使用上转换纳米温度计测定脂质双层的热学性质

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摘要

Luminescent nanomaterials have shown promise for thermal sensing in bio-applications, yet little is known of the role of organic coatings such as supported lipid bilayers on the thermal conductivity between the nanomaterial and its environment. Additionally, since the supported lipid bilayer mimics the cell membrane, its thermal properties are fundamentally important to understand the spatial variations of temperature and heat transfer across membranes. Herein, a new approach is described that enables direct measurement of these thermal properties using a LiYF4:Er3+/Yb3+ upconverting nanoparticle encapsulated within a conformal supported lipid bilayer and dispersed in water as a temperature probe yielding the temperature gradient across the bilayer. The thermal conductivity of the lipid bilayer is measured as a function of the temperature, being 0.20 +/- 0.02 W m(-1) K-1 at 300 K. For the uncapped nanoparticles dispersed in water, the temperature dependence of the thermal conductivity is also measured in the 300-314 K range as [0.63-0.69] +/- 0.11 W m(-1) K-1. Using a lumped elements model, the directional heat transfer is calculated at each of the system interfaces, namely, nanoparticle-bilayer and bilayer-nanofluid, opening a new avenue to understand the membrane biophysical properties as well as the thermal properties of organic and polymer coatings.
机译：发光纳米材料已显示出在生物应用中进行热传感的前景，但人们对有机涂层（例如负载的脂质双层）对纳米材料及其周围环境之间的热导率的作用了解甚少。另外，由于支持的脂质双层模仿细胞膜，因此其热性质对于了解温度和跨膜传热的空间变化至关重要。本文中，描述了一种新方法，该方法能够使用封装在保形负载脂质双层中并分散在水中的LiYF4：Er3 + / Yb3 +上转换纳米颗粒直接测量这些热性质，并作为温度探针在水中产生跨双层的温度梯度。脂质双层的导热系数是温度的函数，在300 K时为0.20 +/- 0.02 W m（-1）K-1。对于分散在水中的未封端纳米粒子，导热系数的温度依赖性也在300-314 K范围内测量为[0.63-0.69] +/- 0.11 W m（-1）K-1。使用集总元素模型，在每个系统界面（即纳米颗粒-双层和双层-纳米流体）处计算定向传热，从而开辟了一条新途径，以了解膜的生物物理性质以及有机和聚合物涂层的热性质。

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