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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Phase Separation of Aqueous Poly(vinyl methyl ether) Solutions Induced by the Photon Pressure of a Focused Near-Infrared Laser Beam
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Phase Separation of Aqueous Poly(vinyl methyl ether) Solutions Induced by the Photon Pressure of a Focused Near-Infrared Laser Beam

机译：聚焦近红外激光束光子压力引起的聚乙烯乙烯基水溶液的相分离

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摘要

We demonstrate that phase separation of an aqueous poly(vinyl methyl ether) (PVME) solution can be triggered not only by a temperature change but also by photon pressure.A near-infrared continuous wave laser beam (lambda=1064 run) was focused through an objective lens into a heavy water (D2O) solution of PVME.A single PVME micro-particle was produced and trapped at the focal point of the laser beam within several hundreds of seconds after switching on the laser.The origin of the microparticle formation (phase separation) is ascribed essentially to the photon force of the laser beam,and not to a rise in the local temperature,since heavy water is transparent at 1064 nm.The structures of the PVME microparticles produced by laser irradiation were studied in detail using confocal Raman microspectroscopy.Raman spectra of the microparticles and coiled/globular PVME were observed successfully over a wide wavenumber region.It was confirmed that the phase transition of the polymer chains from coiled to globular states proceeded during microparticle formation.The fundamental mechanism of photo-induced phase separation of PVME is discussed in terms of the interactions between the polymer and the photon force.
机译：我们证明了聚乙烯醇（PVME）水溶液的相分离不仅可以通过温度变化而且可以通过光子压力来触发。近红外连续波激光束（λ= 1064 run）通过将物镜放入PVME的重水（D2O）溶液中。产生单个PVME微粒，并在打开激光器后几百秒内将其捕获在激光束的焦点处。相分离）基本上归因于激光束的光子力，而不归因于局部温度的升高，因为重水在1064 nm处是透明的。使用共聚焦技术详细研究了激光辐照产生的PVME微粒的结构拉曼光谱法：在宽波数范围内成功观察到了微粒和盘绕/球状PVME的拉曼光谱，证实了聚合物链与钴的相变随着聚合物与光子力之间的相互作用，讨论了PVME光诱导相分离的基本机理。

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