Thermochromic Microgels and Core-Shell Microgels Based on Fluorescence Resonance Energy Transfer
Thermochromic Microgels and Core-Shell Microgels Based on Fluorescence Resonance Energy Transfer
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基于荧光共振能量转移的热致变色微凝胶和核壳微凝胶
DOI：
10.1002/app.39161
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Kousuke
中科院分区：
文献类型：
--
作者：
Okada;Kousuke
制备了基于荧光共振能量转移（FRET）的热致变色微凝胶。FRET微凝胶由具有固定荧光素和罗丹明部分的聚（N-异丙基丙烯酰胺）（PNiPAm）网络组成，并在34-35°C下表现出体积相变（VPT）。在VPT过程中它们的尺寸的临界减小增强了荧光素作为供体和罗丹明作为受体之间的FRET的效率。因此，当荧光素被激发时，来自荧光素的发射（523 nm）和罗丹明的发射（579 nm）分别在低于和高于VPT温度的温度下占主导地位。我们还制备了具有两步颜色变化的热致变色核壳FRET微凝胶。该微凝胶由PNiPAm核和聚（N-异丙基丙烯酰胺-co-N，N-二乙基丙烯酰胺）壳组成，并在19和33°C下表现出双重温度响应性。在这些温度下，微凝胶的荧光光谱也分两步变化。© 2013 Wiley Periodicals，Inc. J.应用聚合物科学，2013
Microgels exhibiting thermochromic behavior based on fluorescence resonance energy transfer (FRET) are prepared. The FRET microgels consist of poly(N‐isopropylacrylamide) (PNiPAm) networks with fixed fluorescein and rhodamine moieties and exhibits volume phase transition (VPT) at 34–35°C. A critical decrease in their sizes during the VPT enhances the efficiency of FRET between fluorescein as a donor and rhodamine as an acceptor. Therefore, emission from fluorescein (523 nm) and that of rhodamine (579 nm) is dominant at temperatures below and above the VPT temperature, respectively, when fluorescein is excited. We also prepare thermochromic core‐shell FRET microgel exhibiting two‐step color change. The microgels consist of a PNiPAm core and a poly(N‐isopropylacrylamide‐co‐N,N‐diethylacrylamide) shell and exhibit dual temperate‐responsiveness at 19 and 33°C. The fluorescence spectrum of the microgels also changes in two steps at these temperatures. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013