当前位置: X-MOL 学术Radiat. Phys. Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Controlled radiation-chemical synthesis of metal polymer nanocomposites in the films of interpolyelectrolyte complexes: Principles, prospects and implications
Radiation Physics and Chemistry ( IF 2.9 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.radphyschem.2018.11.030
Alexey A. Zezin , Dmitry I. Klimov , Elena A. Zezina , Kristina V. Mkrtchyan , Vladimir I. Feldman

Abstract The radiation-chemical synthesis of metal nanoparticles embedded into polymer matrices is an effective tool for preparation of the composite materials with very useful functional properties. This paper presents a review of an original approach to a single-step production of such materials via the radiation-induced reduction of the interpolyelectrolyte complex (IPEC) films containing metal ions under heterogeneous conditions, including the most recent results, and analysis of the prospects of this approach and its implications. First, the properties of IPECs as precursors for nanocomposites are briefly considered. Particular impact is given to the mechanistic aspects and principles of control of the nanoparticle formation and assembling at different stages. A common procedure of the radiation-chemical synthesis of metal polymer nanocomposites in the IPEC matrices implies irradiation of swollen films in an aqueous – organic environment. The kinetics of ion reduction and formation of nanoparticles was monitored by EPR and optical spectroscopy, whereas the obtained nanocomposites were characterized by TEM and diffraction methods. Using IPEC matrices allows us to reveal different stages of formation of metal nanostructures over a wide range of absorbed doses. Furthermore, it is possible to manipulate the processes of nucleation and growth of nanoparticles using both physical and chemical factors. Different kinds of radiation (e-beams, γ- and X-rays) were used in the experiments. It was shown that the penetration depth, dose rate and total absorbed dose had strong effect on the effect on nanoparticle size and their spatial distribution. The most striking feature were found for the processes induced by X-ray radiation. Detailed studies of this particular case revealed a very interesting effect described as radiation-chemical contrast, which is manifested by local intensification of the radiation-induced processes in the vicinity of existing nanoparticles. In addition to metal nanoparticles of different transition and noble metals, it was possible to obtain the bimetallic nanostructures within the IPEC matrix. Such nanocomposites may be potentially used as optical and magnetic materials, sensors, bactericide and fungicide products. The possibility of variation of nanoparticle size and specific properties of the IPEC films is crucially important for particular applications.

中文翻译:

聚合电解质复合物薄膜中金属聚合物纳米复合材料的受控辐射化学合成:原理、前景和意义

摘要 嵌入聚合物基质中的金属纳米粒子的辐射化学合成是制备具有非常有用的功能特性的复合材料的有效工具。本文综述了在异质条件下通过辐射诱导还原含有金属离子的聚电解质复合物 (IPEC) 薄膜单步生产此类材料的原始方法,包括最新结果和前景分析这种方法及其影响。首先,简要考虑了 IPEC 作为纳米复合材料前体的特性。特别影响的是在不同阶段控制纳米颗粒形成和组装的机械方面和原理。IPEC 基质中金属聚合物纳米复合材料的辐射化学合成的一个常见程序意味着在水-有机环境中对溶胀薄膜进行辐照。离子还原和纳米粒子形成的动力学通过 EPR 和光谱学监测,而获得的纳米复合材料通过 TEM 和衍射方法进行表征。使用 IPEC 矩阵使我们能够揭示在广泛的吸收剂量范围内形成金属纳米结构的不同阶段。此外,可以使用物理和化学因素来操纵纳米粒子的成核和生长过程。实验中使用了不同种类的辐射(电子束、γ 射线和 X 射线)。结果表明,穿透深度,剂量率和总吸收剂量对纳米颗粒大小及其空间分布的影响很大。最显着的特征是由 X 射线辐射引起的过程。对这种特殊情况的详细研究揭示了一种非常有趣的效应,称为辐射化学对比,这表现为现有纳米粒子附近辐射诱导过程的局部增强。除了不同过渡金属和贵金属的金属纳米颗粒外,还可以在 IPEC 基质中获得双金属纳米结构。这种纳米复合材料有可能用作光学和磁性材料、传感器、杀菌剂和杀真菌剂产品。
更新日期:2020-04-01
down
wechat
bug