Creation of large, periodic temperature gradient via plasmonic heating from mesoscopic planar lattice of metal domains
Creation of large, periodic temperature gradient via plasmonic heating from mesoscopic planar lattice of metal domains
复制标题
通过金属域介观平面晶格的等离子体加热产生大的周期性温度梯度
DOI：
10.1016/j.ijthermalsci.2017.04.022
复制
发表时间：
2017
影响因子：
4.5
通讯作者：
Watanabe Hiroshi
中科院分区：
文献类型：
--
作者：
Shimada Ryoko;Sakai Hitomi;Yamamoto Jun;Watanabe Hiroshi
大的温度梯度对于浓缩具有非零Soret系数的温度敏感分子是有用的。针对这种分子操纵作为最终目标，本研究分析了两种类型的热源，二维晶格的金属域和一个单点金属域，都可以进行等离子体共振和产生热量的传热方程。事实证明，从单点域的等离子体激元加热只能产生一个单调的温度分布与一个单一的最大值相关联的径向温度梯度的逐渐衰减。相反，与适当的选择的边界条件，金属域的晶格被发现给一个大的，周期性的温度梯度，这是有用的温度敏感的分子，特别是那些有利于低温的操作的配置文件。利用银畴晶格的初步实验证实了103 K/mm量级的大的、大致周期性的温度梯度的产生（与热传递分析相协调），这鼓励了对由等离子体激元加热控制的温度梯度和利用该梯度的分子操纵的进一步研究。
A large temperature gradient is useful for concentrating temperature-sensitive molecules having non-zero Soret coefficients. Aiming at such molecular manipulation as a final goal, this study analyzed the heat transfer equation for two types heat sources, two-dimensional lattice of metal domains and a single-spot metal domain, both being able to undergo plasmon resonance and generate heat. It turned out that the plasmonic heating from the single-spot domain can generate only a monotonic temperature profile with a single maximum associated by a gradual decay of radial gradient of temperature. In contrast, with an adequate choice of the boundary conditions, the lattice of the metal domains was found to give a profile with a large, periodic temperature gradient that is useful for the manipulation of temperature-sensitive molecules, in particular those favoring low temperatures. A preliminary experiment utilizing a lattice of silver domains confirmed creation of a large, roughly periodic temperature gradient of the order of 103K/mm (being in harmony with the heat transfer analysis), which encourages a further study of temperature gradient controlled by the plasmonic heating and of the molecular manipulation utilizing this gradient.