Experimental and theoretical studies of light-to-heat conversion and collective heating effects in metal nanoparticle solutions.
Experimental and theoretical studies of light-to-heat conversion and collective heating effects in metal nanoparticle solutions.
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DOI：
10.1021/nl8036905
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发表时间：
2009-03
期刊：
影响因子：
10.8
通讯作者：
Govorov AO
中科院分区：
文献类型：
--
作者：
Richardson HH;Carlson MT;Tandler PJ;Hernandez P;Govorov AO
我们对含有金纳米颗粒（NP）的水滴进行了一系列光加热实验。用光量热法测定了光-热转换效率（η），其值非常接近1（0.97< η <1.03）。详细的研究揭示了一个复杂的字符在光刺激液滴的传热。平衡的主要机制是由于对流。进行理论建模，以描述在纳米和毫米尺度的热效应。理论分析表明，集体光加热是其主要机制。对于大浓度的NP和小的激光强度，平均温度增加（在毫米尺度下）是显著的（~ 7 °C），而在纳米尺度上，单个NP表面的温度增加很小（0.02 °C）。在相反的情况下，一个小的NP浓度和强烈的激光照射，我们发现一个相反的图片：在毫米级的温度增加是小的（0.1 °C），但局部，纳米级的温度有强烈的局部尖峰在NP的表面（3 °C）。这些研究对于理解纳米颗粒的光热效应及其在纳米和生物技术中的潜在和当前应用至关重要。
We perform a set of experiments on photo-heating in a water droplet containing gold nanoparticles (NPs). Using photo-calorimetric methods, we determine efficiency of light-to-heat conversion (η) which turns out to be remarkable close to 1, (0.97< η <1.03). Detailed studies reveal a complex character of heat transfer in an optically-stimulated droplet. The main mechanism of equilibration is due to convectional flow. Theoretical modeling is performed to describe thermal effects at both nano- and millimeter-scales. Theory shows that the collective photo-heating is the main mechanism. For a large concentration of NPs and small laser intensity, an averaged temperature increase (at the millimeter-scale) is significant (~ 7 °C) whereas, on the nanometer scale, the temperature increase at the surface of a single NP is small (0.02 °C). In the opposite regime, a small NP concentration and intense laser irradiation, we find an opposite pictures: a temperature increase at the millimeter-scale is small (0.1 °C) but a local, nanoscale temperature has strong local spikes at the surfaces of NPs (3 °C). These studies are crucial for the understanding of photo-thermal effects in NPs and for their potential and current applications in nano-and bio -technologies.
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影响因子：
10.8
作者：
Durr, Nicholas J.;Larson, Timothy;Ben-Yakar, Adela
通讯作者：
Ben-Yakar, Adela
影响因子：
--
作者：
Govorov, Alexander O.;Zhang, Wei;Skeini, Timur;Richardson, Hugh;Lee, Jaebeom;Kotov, Nicholas A.
通讯作者：
Kotov, Nicholas A.
影响因子：
10.8
作者：
Chen, Jingyi;Wang, Danling;Li, Xingde
通讯作者：
Li, Xingde
DOI：
10.1073/pnas.1534635100
发表时间：
2003-09-30
影响因子：
11.1
作者：
Cognet, L;Tardin, C;Lounis, B
通讯作者：
Lounis, B
影响因子：
3.3
作者：
Hartland, GV;Hu, M;Sader, JE
通讯作者：
Sader, JE