Local Extraction and Condensation under a Microscope Using the Optically Controlled Phase Separation of a Thermoresponsive Polymer
Local Extraction and Condensation under a Microscope Using the Optically Controlled Phase Separation of a Thermoresponsive Polymer
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DOI：
10.1002/asia.201200591
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发表时间：
2013-01-01
影响因子：
4.1
通讯作者：
Katayama, Kenji
中科院分区：
文献类型：
--
作者：
Inoue, Hayato;Yamamoto, Takayuki;Katayama, Kenji
在显微镜下，在近红外（NIR）激光加热产生的热敏聚合物水溶液的相分离区域中进行各种染料的原位萃取和缩合。NIR激光照射指向沉积在玻璃基板上的铬线，从而由于光热效应引起溶液的局部加热。相分离区域通过热敏性聚合物的脱水，随后将水喷射到相分离区域之外而形成。当溶液中包含各种染料时，一些染料分子被提取到相分离区域，在那里它们凝聚。在聚（N-异丙基丙烯酰胺）（PNIPAM，10wt%水溶液）作为温敏聚合物和结晶紫（CV）作为染料（0.1mm）的情况下，CV浓缩约25倍。结果发现，萃取/缩合的必要条件之一是染料分子的疏水性;然而，PNIPAM链内积累的主要原因是PNIPAM侧链中的酰胺基团与染料分子中的官能团如羰基或氨基之间的分子相互作用。
In-situ extraction and condensation of various dyes were carried out in a phase-separation region of a thermoresponsive polymer aqueous solution generated by near infrared (NIR) laser heating under a microscope. The NIR laser irradiation was directed at a chromium line deposited on a glass substrate, thereby causing local heating of the solution due to the photothermal effect. A phase-separation region was formed by dehydration of the thermoresponsive polymer followed by ejection of water outside of the phase-separation region. When various dyes were included in the solution, some dye molecules were extracted into the phase-separation region, where they condensed. In the case of poly(N-isopropylacrylamide) (PNIPAM, 10 wt% in an aqueous solution) as the thermoresponsive polymer and crystal violet (CV) as the dye (0.1 mm), CV condensed by about 25 times. It was found that one of the necessary conditions for the extraction/condensation is the hydrophobicity of the dye molecule; however, the dominant cause for accumulating inside the PNIPAM chain is the molecular interaction between the amide group in the side chain of PNIPAM and the functional groups such as carbonyl or amino groups in the dye molecules.