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Light-switchable nanoparticles based on amphiphilic diblock, triblock and heterograft polyoxazoline

机译：基于两亲硅基二嵌段，三嵌段和异质移植多恶唑啉的可光切换纳米粒子

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摘要

Photo-active nanoparticles (NPD, NPT, NPH) were elaborated in water from amphiphilic diblock (D), triblock (T) and heterograft (H) copolymers based on a chromatic unit, coumarin, linked to an alkyl chain and a hydrophilic polyoxazoline chain. Under UV-exposure, for graft copolymers, the coumarin moieties crosslink the nanoparticle core (NPHx) while a simple chain by chain dimerization happens with linear diblock and triblock copolymers (NPDx and NPT). The self-assembly of these copolymers was examined as well as the UV-activity and UV-reversibility of the corresponding NPs by UV spectroscopy. Their stability under light exposure and temperature was also monitored by dynamic light scattering (DLS). Finally, the loading of a lipophilic fluorescent probe (Nile red) into the NP core was evaluated by fluorescence emission. All these data illustrate the tunable size, UV-activity, stability and loading efficiency of the NPs by the starting macromolecular architecture of the amphiphilic copolymers. Triblock copolymers seem to be a promising tool for switchable NPs characterized by two opposite states: NPs alternatively with and without a photo-dimerized core.
机译：基于含有烷基，与烷基链和亲水性多氧化唑啉链连接的聚铬单元，三嵌段（T），三嵌段（T）和异质移植（H）共聚物在水中阐述了光活性纳米粒子（NPD，NPT，NPH），与烷基链和亲水性多氧化物链连接。在紫外线暴露下，对于接枝共聚物，香豆素部分交联纳米颗粒核（NPHX），而通过链二嵌段和三嵌段共聚物（NPDX和NPT）发生简单链。通过UV光谱检查这些共聚物的自组装以及相应NP的UV活性和UV可逆性。通过动态光散射（DLS）也监测它们在曝光和温度下的稳定性。最后，通过荧光发射评估将亲脂性荧光探针（尼罗红）加入NP核心。所有这些数据通过两亲共聚物的起始大分子结构说明了NP的可调谐尺寸，紫外线活性，稳定性和加载效率。三嵌段共聚物似乎是用于可切换NP的有希望的工具，其特征在于两个相对的状态：NPS或者没有光学二化芯。

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  • 来源
    《RSC Advances》 |2017年第68期|共9页
  • 作者

    Korchia L.; Bouilhac C.; Aubert A.; Robina J. -J.; Lapinte V.;

  • 作者单位

    Univ Montpellier Equipe Ingn &

    Architectures Macromol Inst Charles Gerhardt Montpellier CNRS UM ENSCM U Montpellier France;

    Univ Montpellier Equipe Ingn &

    Architectures Macromol Inst Charles Gerhardt Montpellier CNRS UM ENSCM U Montpellier France;

    Univ Montpellier Equipe Mat Avances Catalyse &

    Sante Inst Charles Gerhardt Montpellier CNRS UM ENSCM U Montpellier France;

    Univ Montpellier Equipe Ingn &

    Architectures Macromol Inst Charles Gerhardt Montpellier CNRS UM ENSCM U Montpellier France;

    Univ Montpellier Equipe Ingn &

    Architectures Macromol Inst Charles Gerhardt Montpellier CNRS UM ENSCM U Montpellier France;

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  • 正文语种 eng
  • 中图分类 化学;
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