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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.

我们用聚焦的1064 nm激光对溶液中的分子和纳米粒子体系施加光子压力，探索了新的现象，并从分子的角度分析了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，同时提出了针对单个纳米粒子的新的光谱和图案化方法。这些结果是新的，形成了“光子压强化学”的一个新的研究领域，其主要结果如下1.利用聚焦光束在室温溶液中制备了纤维状结构的聚合物，并沉积在基片上。在过饱和条件下，通过将聚合物捕获在流动的溶液中，使制备成为可能。当光束很强时，聚合物的同时捕获和溶液表面的变形是可能的。结果表明，在中等激光功率下，聚合物的聚集态分布在聚焦点，聚集态的体积最大，并给出了聚集态的数学模型。通过单粒子荧光测量和荧光相关光谱测量了荧光聚合物纳米球的光学捕获动力学，分析了单个纳米微球的捕获是如何演化成大的聚集体的。成功地展示了金纳米粒子、J-聚集体和银纳米粒子与染料的激光捕获和溶液中单个纳米粒子和纳米晶体的光谱。提出了一种将捕获、加热和聚合相结合的溶液中单个纳米粒子的三维捕获和图案化方法。这种方法将对聚合物、树枝状大分子、蛋白质、活细胞和其他溶液中的软材料进行图案化处理。