Localization of Spiropyran Activation.
Localization of Spiropyran Activation.
复制标题
螺吡喃激活的定位。
作者：
Martha E. Grady;Cassandra M. Birrenkott;Preston A. May;S. White;Jeffrey S. Moore;N. Sottos
平面和弯曲的玻璃表面与螺吡喃（SP）分子和本地化的UV诱导激活的机械基团的功能化证明。紫外线照射的SP-功能化表面的荧光光谱显示，表面粗糙度或曲率的增加产生更有效的转换的机械基团的开放mercury（MC）的形式。此外，在弯曲的玻璃-聚合物界面而不是平面界面处实现机械基团的力诱导活化。来自UV照射的SP官能化平面玻璃表面的最小荧光信号排除了机械活化测试。弯曲的玻璃-聚合物界面通过E-玻璃纤维的SP官能化制备，其随后嵌入聚（甲基丙烯酸甲酯）（PMMA）基质中。机械活化是通过单纤维微粘结测试方案通过剪切载荷诱导的。在界面处的SP活化的原位检测通过荧光光谱法监测。界面测试期间的荧光增加表明，存在界面SP分子与纤维表面和聚合物基质两者的附着，并且能够在纤维-聚合物基质界面处实现SP的显著活化。与以往的研究不同，散装聚合物，SP激活检测在相对较低的水平施加的剪切应力。通过在玻璃-聚合物界面处连接SP并将负载直接转移到该界面，实现了引发SP响应的更有效的机制。
Functionalization of planar and curved glass surfaces with spiropyran (SP) molecules and localized UV-induced activation of the mechanophore are demonstrated. Fluorescence spectra of UV-irradiated SP-functionalized surfaces reveal that increases in surface roughness or curvature produces more efficient conversion of the mechanophore to the open merocyanine (MC) form. Further, force-induced activation of the mechanophore is achieved at curved glass-polymer interfaces and not planar interfaces. Minimal fluorescence signal from UV-irradiated SP-functionalized planar glass surfaces precluded mechanical activation testing. Curved glass-polymer interfaces are prepared by SP functionalization of E-glass fibers, which are subsequently embedded in a poly(methyl methacrylate) (PMMA) matrix. Mechanical activation is induced through shear loading by a single fiber microbond testing protocol. In situ detection of SP activation at the interface is monitored by fluorescence spectroscopy. The fluorescence increase during interfacial testing suggests that attachment of the interfacial SP molecule to both fiber surface and polymer matrix is present and able to achieve significant activation of SP at the fiber-polymer matrix interface. Unlike previous studies for bulk polymers, SP activation is detected at relatively low levels of applied shear stress. By linking SP at the glass-polymer interface and transferring load directly to that interface, a more efficient mechanism for eliciting SP response is achieved.
在生活/非生存界面处的张力传感纳米颗粒用于机械成像。
影响因子：
15
作者：
Liu, Yang;Yehl, Kevin;Narui, Yoshie;Salaita, Khalid
通讯作者：
Salaita, Khalid