Formation of core/corona nanoparticles with interpolyelectrolyte complex cores in aqueous solution: insight into chain dynamics in the complex from fluorescence quenching 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Soft matter
年/卷/期
2018 / 14 / 37
页码
7578-7585
ISSN号
1744-683X
作者单位
Charles Univ Prague, Dept Phys & Macromol Chem, Hlavova 8, Prague 12800 2, Czech Republic;Charles Univ Prague, Dept Phys & Macromol Chem, Hlavova 8, Prague 12800 2, Czech Republic;Czech Acad Sci, Inst Macromol Chem, Heyrovsky Sq 2, Prague 16206 6, Czech Republic;Czech Acad Sci, Inst Macromol Chem, Heyrovsky Sq 2, Prague 16206 6, Czech Republic;Czech Acad Sci, Inst Macromol Chem, Heyrovsky Sq 2, Prague 16206 6, Czech Republic;Natl Hellen Res Fdn, Inst Theoret & Phys Chem, 48 Vassileos Constantinou Ave, GR-11635 Athens, Greece;Charles Univ Prague, Dept Phys & Macromol Chem, Hlavova 8, Prague 12800 2, Czech Republic;
作者
Murmiliuk, Anastasiia;Matejicek, Pavel;Filippov, Sergey K.;Janata, Miroslav;Slouf, Miroslav;Pispas, Stergios;Stepanek, Miroslav;
摘要
Formation of interpolyelectrolyte complexes (IPECs) of poly(methacrylic acid) (PMAA) bearing a fluorescent label (umbelliferone) at the chain end and poly[3,5-bis(trimethyl ammoniummethyl)-4-hydroxystyrene iodide]-block-poly(ethylene oxide) (QNPHOS-PEO) acting as a fluorescence quencher, was followed using a combination of scattering, calorimetry, microscopy and fluorescence spectroscopy techniques. While scattering and microscopy measurements indicated formation of spherical core/corona nanoparticles with the core of the QNPHOS/PMAA complex and the PEO corona, fluorescence measurements showed that both static and dynamic quenching efficiency were increased in the nanoparticle stability region. As the dynamic quenching rate constant remained unchanged, the quenching enhancement was caused by the increase in the local concentration of QNPHOS segments in the microenvironment of the label. This finding implies that the local dynamics of PMAA end chains affecting the interaction of the label with QNPHOS segments was independent of both PMAA and QNPHOS chain conformations.
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