Self-aggregation of the pyrene labeled poly(acrylic acid) in nanoscopically crowded environments

被引：7

作者：

Stinga, Gabriela ^{[1
]}

Baran, Adriana ^{[1
]}

Iovescu, Alina ^{[1
]}

Simion, Elena Livia ^{[1
]}

Aricov, Ludmila ^{[1
]}

Anghel, Dan-Florin ^{[1
]}

机构：

[1] Romanian Acad, Ilie Murgulescu Inst Phys Chem, Colloid Chem Lab, 202 Spl Independentei, Bucharest 060021, Romania

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2016年 / 328卷

关键词：

Fluorescent polymer; Pyrene excimer; Reverse micelle; STEADY-STATE FLUORESCENCE; RESONANCE ENERGY-TRANSFER; REVERSE MICELLES; PHOTOPHYSICAL PROPERTIES; ASSOCIATION LEVEL; NANOPARTICLES; WATER; DYNAMICS; POLYELECTROLYTES; ADSORPTION;

D O I：

10.1016/j.jphotochem.2016.05.021

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The paper investigates the behavior of pyrene labeled poly(acrylic acid) with various graft content in sodium bis(2-ethylhexyl) sulfosuccinate (AOT) reverse micelles (RMs) at various hydration degrees (w(o)). The work is carried out by UV-vis, steady-state and time-resolved fluorescence as well as dynamic light scattering (DLS). The report indicates new insights regarding the interactions and dynamics of the fluorescent labeled polymer in the nanoscopic aqueous host. It was found that the spectral properties of the polymer depend on the H-bonds and pi-pi interactions. The efficiency of pyrene excimer formation indicated the "on-off" control of the polymer chain in RMs by triggering of wo. The constriction of the polymer coil in different nanocages of RMs influenced the formation of excimers. At low wo, the pyrene labeled poly(acrylic acid) senses the micellar interface. At higher hydration degree, the grafted polymer resides in the water pool of RMs with elevated polarity similar to that in the bulk water. The study discloses the ability of the pyrene-labeled polymer to sense the crowded nano-environments. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：33 / 41

页数：9

共 51 条

[1] Kinetics of p-nitrophenyl acetate hydrolysis catalyzed by Mucor java']javanicus lipase in AOT reverse micellar solutions formulated in different organic solvents [J].