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Amplified polarization properties of electrospun nanofibers containing fluorescent dyes and helical polymer†
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2018-01-25 00:00:00 , DOI: 10.1039/c7pp00413c N. Kaerkitcha 1, 2, 3, 4 , T. Sagawa 1, 2, 3, 4
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2018-01-25 00:00:00 , DOI: 10.1039/c7pp00413c N. Kaerkitcha 1, 2, 3, 4 , T. Sagawa 1, 2, 3, 4
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Nanofibers with the cationic fluorescent molecules, 1-pyrenemethylamine hydrochloride (PyrMA) and α,β,γ,δ-tetrakis(1-methylpyridinium-4-yl)porphyrin p-toluenesulfonate (TMPyP), in the presence of complementary anionic chiral polysaccharide, hyaluronic acid (HA) and transparent polymer, polyethylene oxide (PEO) were successfully prepared using an electrospinning technique. The results showed that the fluorescence spectra of electrospun nanofibers (ENFs) of PEO-HA-PyrMA exhibit a higher amount of pyrene excimer emission when the [PyrMA]/[HA] ratio was increased from 0.5 to 1, while the concentration of TMPyP had no remarkable effect on the fluorescence of the PEO-HA-TMPyP ENFs. From circular dichroism (CD) characterization, the ENFs of both dyes exhibit stronger intensities in the apparent CD spectra upon increasing the dye ratio. Moreover, they also showed higher CD intensities when compared with those of solutions and thin films prepared using other methods. The apparent CD in this work was proved to mainly originate from linear dichroism (LD) and linear birefringence (LB) obtained by macroscopic alignment along the electrospinning process. These results suggest the advantages of molecular orientation via electrospinning, together with chirality induction by incorporation of a chiral HA polymer. The enhancement of these polarization properties provides great possibilities for improving fluorescent-chiral nanofibers for further optoelectronic applications.
中文翻译：
包含荧光染料和螺旋聚合物的静电纺纳米纤维的放大极化特性†
与阳离子荧光分子，1- pyrenemethylamine盐酸盐（PyrMA）和α，β，γ，δ-四（1-甲基吡啶鎓-4-基）卟啉的纳米纤维p-甲苯磺酸盐（TMPyP），在互补阴离子手性多糖，透明质酸（HA）和透明聚合物的存在下，使用静电纺丝技术成功制备了聚环氧乙烷（PEO）。结果表明，当[PyrMA] / [HA]比从0.5增加到1时，PEO-HA-PyrMA的电纺纳米纤维（ENFs）的荧光光谱表现出更高的of准分子发射量，而TMPyP的浓度为对PEO-HA-TMPyP ENF的荧光无明显影响。根据圆二色性（CD）的表征，两种染料的ENF在增加染料比率时在表观CD光谱中显示出更强的强度。而且，与使用其他方法制备的溶液和薄膜相比，它们还显示出更高的CD强度。证明了这项工作中的表观CD主要来自线性二向色性（LD）和线性双折射（LB），该线性二向色性是通过沿静电纺丝过程的宏观对准而获得的。这些结果表明分子取向的优势通过静电纺丝，以及通过引入手性HA聚合物的手性诱导。这些偏振性质的增强为改进荧光-手性纳米纤维以用于进一步的光电应用提供了极大的可能性。
更新日期：2018-01-25
中文翻译：
包含荧光染料和螺旋聚合物的静电纺纳米纤维的放大极化特性†
与阳离子荧光分子，1- pyrenemethylamine盐酸盐（PyrMA）和α，β，γ，δ-四（1-甲基吡啶鎓-4-基）卟啉的纳米纤维p-甲苯磺酸盐（TMPyP），在互补阴离子手性多糖，透明质酸（HA）和透明聚合物的存在下，使用静电纺丝技术成功制备了聚环氧乙烷（PEO）。结果表明，当[PyrMA] / [HA]比从0.5增加到1时，PEO-HA-PyrMA的电纺纳米纤维（ENFs）的荧光光谱表现出更高的of准分子发射量，而TMPyP的浓度为对PEO-HA-TMPyP ENF的荧光无明显影响。根据圆二色性（CD）的表征，两种染料的ENF在增加染料比率时在表观CD光谱中显示出更强的强度。而且，与使用其他方法制备的溶液和薄膜相比，它们还显示出更高的CD强度。证明了这项工作中的表观CD主要来自线性二向色性（LD）和线性双折射（LB），该线性二向色性是通过沿静电纺丝过程的宏观对准而获得的。这些结果表明分子取向的优势通过静电纺丝，以及通过引入手性HA聚合物的手性诱导。这些偏振性质的增强为改进荧光-手性纳米纤维以用于进一步的光电应用提供了极大的可能性。
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