Poly(ionic liquid)-based nanogels and their reversible photo-mediated association and dissociation
Poly(ionic liquid)-based nanogels and their reversible photo-mediated association and dissociation
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聚（离子液体）基纳米凝胶及其可逆光介导的缔合和解离
DOI：
10.1039/c6py02231f
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发表时间：
2017-02
影响因子：
4.6
通讯作者：
Xiong YB
中科院分区：
文献类型：
--
作者：
Zuo Yong;Yu Junrui;Liu Xiaojun;Cao Peng;Song Pengfei;Wang Rongmin;Xiong Yubing;Wang RM;Xiong YB
在过去的几十年里，控制聚合物和纳米颗粒的缔合和解离引起了人们的极大兴趣。在这项研究中，我们报道了一种新型的基于聚离子液体（PIL）的纳米凝胶，它可以通过偶氮苯（Azo）的反式顺式异构化或偶氮基团与β-环糊精（β-CD）二聚体之间的主客体相互作用进行可逆的光介导的缔合和解离。 PIL纳米凝胶是通过离子液体（IL）单体和交联剂在选择性溶剂中一步交联共聚制备的，并使用动态光散射（DLS）、紫外可见光谱、固态碳核磁共振（13C NMR）、元素分析、X射线光电子能谱（XPS）、傅里叶变换红外（FT-IR）光谱、热重分析（TGA）和扫描电子显微镜（SEM）进行表征。结果表明，含有偶氮单元的 PIL 纳米凝胶的尺寸可以通过 IL 单体与交联剂的进料比轻松调节，并且它们的极性也可以通过阴离子交换来介导。此外，由于偶氮单元的存在，PIL纳米凝胶在水中可以在紫外光和可见光交替照射下可逆地缔合和解离。此外，通过使用 PIL 纳米凝胶作为构建块，可以通过偶氮和 β-CD 二聚体的主客体相互作用实现超分子聚集体。组装过程通过紫外可见光谱、DLS、二维核欧沃豪瑟效应光谱 (NOESY) 和 SEM 测量进行了验证。因此，我们的研究结果为聚合物纳米粒子的光诱导缔合和解离提供了可行的策略。
Controlling the association and dissociation of polymers and nanoparticles has attracted tremendous interest in the past few decades. In this study, we reported a novel poly(ionic liquid) (PIL)-based nanogel that could undergo reversible photo-mediated association and dissociation through the trans–cis isomerizatioin of azobenzene (Azo) or host–guest interactions between the Azo group and β-cyclodextrin (β-CD) dimer. PIL nanogels were fabricated via the one-step cross-linking copolymerization of ionic liquid (IL) monomers and cross-linkers in a selective solvent, and characterized using dynamic light scattering (DLS), UV-vis spectroscopy, solid state carbon nuclear magnetic resonance (13C NMR), elementary analyses, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analyses (TGA), and scanning electron microscopy (SEM). The results demonstrated that the sizes of PIL nanogels containing Azo units could be facilely tuned through the feed ratio of IL monomers to cross-linkers, and their polarity could also be mediated through anion exchange. Moreover, due to the presence of Azo units, PIL nanogels in water could associate and dissociate reversibly under the alternative irradiation of UV and visible light. Additionally, by using PIL nanogels as the building blocks, supramolecular aggregates could be achieved via the host–guest interaction of Azo and β-CD dimers. The assembly process was testified by UV-vis spectroscopy, DLS, 2D nuclear Overhauser effect spectroscopy (NOESY), and SEM measurements. Therefore, our findings provided a feasible strategy for the photo-induced association and dissociation of polymer nanoparticles.
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