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Photo-force controlled molecular systems and materials

光力控制的分子系统和材料

基本信息

批准号：
14103006
负责人：
MASUHARA Hiroshi
金额：
$ 67.23万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (S)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14103006/
关键词：
Laser Trapping Photon pressure Chemistry Gold nanoparticle Polymer nanosphere Hyper Rayleigh scattering Hyper Raman scattering Single nanoparticle spectroscopy Two-photon excitation fluorescence 光捕捉 J会合体光重合蛍光スペクトル蛍光相関分光高分子

项目摘要

We have explored new phenomena by applying photon pressure of a focused 1064 nm laser beam to molecular and nanoparticle systems in solution and analyzed their trapping and assembling dynamics from molecular viewpoints. New laser deposition phenomena were found and elucidated, while new spectroscopic and patterning methods for individual nanoparticles were proposed. The results are novel and form a new research area on "photon pressure chemistry", whose main results are listed below.1. Fiber-like structure of polymers in solution at room temperature are prepared by the focused beam and deposited on a substrate. The preparation is made possible under the super-saturated condition realized by trapping polymers in the flowing solvent.2. When the beam is intense, simultaneous trapping of the polymer and deformation of the solution surface is made possible. As a result polymer assembly is left at the focal point, whose volume is largest at the medium laser power, for which a model was presented.3. Optical trapping dynamics of fluorescent polymer nanospheres were measured by single particle fluorescence measurement and fluorescence correlation spectroscopy, and how trapping of individual nanoshperes evolves to a large aggregate was analyzed.4. Laser trapping and spectroscopy of single nanoparticles and nanocrystals in solution was successfully demonstrated for gold nanoparticles, J-aggregates, and silver nanopaticles with dyes.5. A 3-dimensional trapping and patterning method of single nanoparticles in solution was presented by combining trapping, heating, and polymerization. This method will be useful to pattern soft materials such as polymers, dendrimers, proteins, living cells, and others in solution.

我们通过将聚焦 1064 nm 激光束的光子压力应用于溶液中的分子和纳米粒子系统来探索新现象，并从分子角度分析它们的捕获和组装动力学。发现并阐明了新的激光沉积现象，同时提出了单个纳米粒子的新光谱和图案化方法。该研究成果新颖，形成了“光子压力化学”的新研究领域，其主要成果如下： 1．室温下溶液中聚合物的纤维状结构通过聚焦光束制备并沉积在基底上。通过将聚合物捕获在流动溶剂中，实现了过饱和条件下的制备。 2．当光束强度很大时，可以同时捕获聚合物和溶液表面的变形。结果聚合物组装体留在焦点处，其体积在中等激光功率下最大，并为此建立了模型。 3．通过单颗粒荧光测量和荧光相关光谱测量了荧光聚合物纳米球的光捕获动力学，并分析了单个纳米球的捕获如何演化为大的聚集体。 4．成功地证明了溶液中的金纳米颗粒、J-聚集体和带有染料的银纳米颗粒的激光捕获和光谱分析。5．通过结合捕获、加热和聚合，提出了溶液中单个纳米粒子的 3 维捕获和图案化方法。该方法可用于在溶液中对软材料（例如聚合物、树枝状聚合物、蛋白质、活细胞和其他材料）进行图案化。