Spatial temperature mapping within polymer nanocomposites undergoing ultrafast photothermal heating via gold nanorods.
Spatial temperature mapping within polymer nanocomposites undergoing ultrafast photothermal heating via gold nanorods.
复制标题
通过金纳米棒进行超快光热加热的聚合物纳米复合材料内的空间温度图。
DOI：
10.1039/c4nr05179c
复制
发表时间：
2014
期刊：
影响因子：
6.7
通讯作者：
Clarke,LauraI
中科院分区：
文献类型：
--
作者：
Maity,Somsubhra;Wu,Wei-Chen;Xu,Chao;Tracy,JosephB;Gundogdu,Kenan;Bochinski,JasonR;Clarke,LauraI
金纳米棒在局部表面等离子体共振的超快光激发下产生热量。在脉冲飞秒光热作用下，利用两种独立的系综光学技术测定了嵌入GNRs的聚合物基体内形成的稳态纳米级温度分布。纳米棒的物理旋转揭示了每个纳米棒周围空间体积内聚合物熔体的平均局部温度，而均匀分布的苝分子的荧光监测距离纳米棒较远的样品区域的温度。苝探针的偏振敏感荧光测量提供了每个纳米棒周围准熔融区域的平均尺寸的估计（即，随着温度从每个颗粒径向降低，软化聚合物和固体材料之间的边界），并区分固体和熔融区域的稳态温度。结合这些不同的方法，可以实现由超快激发引起的gnr平均稳态温度分布的纳米尺度空间映射。这些观察结果明确地证明了稳态温度梯度的存在，并表明通过材料内部的光热效应进行局部加热可以实现纳米级热操作，而不会显着改变这些系统中的整体样品温度。通过在固体聚合物纳米纤维中重新定向纳米棒，而不引起高度温度敏感的纳米纤维表面的任何形态变化，进一步验证了这些定量结果。在~ 100 nm的距离上观察到70-90°C的温差。
Heat emanates from gold nanorods (GNRs) under ultrafast optical excitation of the localized surface plasmon resonance. The steady state nanoscale temperature distribution formed within a polymer matrix embedded with GNRs undergoing pulsed femtosecond photothermal heating is determined experimentally using two independent ensemble optical techniques. Physical rotation of the nanorods reveals the average local temperature of the polymer melt in the immediate spatial volume surrounding each rod while fluorescence of homogeneously-distributed perylene molecules monitors temperature over sample regions at larger distances from the GNRs. Polarization-sensitive fluorescence measurements of the perylene probes provide an estimate of the average size of the quasi-molten region surrounding each nanorod (that is, the boundary between softened polymer and solid material as the temperature decreases radially away from each particle) and distinguishes the steady state temperature in the solid and melt regions. Combining these separate methods enables nanoscale spatial mapping of the average steady state temperature distribution caused by ultrafast excitation of the GNRs. These observations definitively demonstrate the presence of a steady-state temperature gradient and indicate that localized heating via the photothermal effect within materials enables nanoscale thermal manipulations without significantly altering the bulk sample temperature in these systems. These quantitative results are further verified by re-orienting nanorods within a solid polymer nanofiber without inducing any morphological changes to the highly temperature-sensitive nanofiber surface. Temperature differences of 70–90 °C were observed over a distances of ∼100 nm.
登录
查看更多内容
DOI：
10.1016/j.jconrel.2011.02.006
发表时间：
2011-06-10
期刊：
Journal of controlled release : official journal of the Controlled Release Society
影响因子：
--
作者：
Lukianova-Hleb EY;Samaniego AP;Wen J;Metelitsa LS;Chang CC;Lapotko DO
通讯作者：
Lapotko DO
影响因子：
14
作者：
Lukianova-Hleb, Ekaterina Y.;Belyanin, Andrey;Kashinath, Shruti;Wu, Xiangwei;Lapotko, Dmitri O.
通讯作者：
Lapotko, Dmitri O.
影响因子：
3.8
作者：
Ullah, Md Azim;Li, Xiangping;Gu, Min
通讯作者：
Gu, Min
影响因子：
13.3
作者：
Hribar, Kolin C.;Metter, Robert B.;Ifkovits, Jamie L.;Troxler, Thomas;Burdick, Jason A.
通讯作者：
Burdick, Jason A.
影响因子：
8.6
作者：
Kozek, Krystian A.;Kozek, Klaudia M.;Wu, Wei-Chen;Mishra, Sumeet R.;Tracy, Joseph B.
通讯作者：
Tracy, Joseph B.