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首页> 外文期刊>RSC Advances >Light-switchable nanoparticles based on amphiphilic diblock, triblock and heterograft polyoxazoline
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Light-switchable nanoparticles based on amphiphilic diblock, triblock and heterograft polyoxazoline

机译：基于两亲性二嵌段，三嵌段和异接枝聚恶唑啉的光可转换纳米粒子

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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：光敏纳米粒子（NP D ，NP T ，NP H ）在水中由基于色单元香豆素的两亲性二嵌段（D），三嵌段（T）和异质接枝（H）共聚物加工而成，香豆素与烷基链和亲水性聚恶唑啉链相连。在紫外线照射下，对于接枝共聚物，香豆素部分使纳米颗粒核（NP Hx ）交联，而线性二嵌段和三嵌段共聚物（NP）则通过链二聚作用形成简单链 Dx 和NP T ）。通过紫外光谱检查了这些共聚物的自组装以及相应NP的UV活性和UV可逆性。还通过动态光散射（DLS）监测了它们在光照和温度下的稳定性。最后，通过荧光发射评估了亲脂性荧光探针（尼罗红）在NP核中的负载。所有这些数据说明了通过两亲共聚物的起始大分子结构，NP的可调大小，UV活性，稳定性和负载效率。三嵌段共聚物似乎是用于以两种相反状态为特征的可转换NP的有前途的工具：具有或不具有光二聚核的NP。

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