The generation of metal nanostructures by radiation-induced reduction of copper ions in aqueous dispersions of macromolecular complexes of poly(acrylic acid) and polyvinylimidazolе has been studied in the pH range of 2.3–4.3. It was shown that an effective coordination number of Cu2+ in the complex with polymer units decreased at lower pH, which resulted in dramatic increase of the nanoparticle formation rate. As demonstrated by transmission electron microscopy, using the poly(acrylic acid)–polyvinylimidazolе–Cu2+ complexes as precursors allows one to control the nanoparticle size and promotes assembling of spatially ordered supramolecular structures. As revealed by dynamic light scattering, decreasing the medium pH leads to ripening of the poly(acrylic acid)–polyvinylimidazolе–Cu2+ particles. The obtained results provide an evidence for strong effect of the pH value on the spatial organization of nanoparticles in irradiated suspensions. In the case of less acidic medium (at pH 3), assembling of nanoparticles occurs in flabby interpolymer particles, whereas at lower pH the metal nanoparticles are produced in the templates of the perfect macromolecular nanostructures.

中文翻译：

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在聚(丙烯酸)-聚(乙烯基咪唑)-Cu2+配合物的辐照分散体中产生空间有序的金属-聚合物纳米结构

在 2.3-4.3 的 pH 值范围内研究了在聚（丙烯酸）和聚乙烯咪唑的大分子复合物的水分散体中通过辐射诱导还原铜离子生成金属纳米结构。结果表明，在较低的 pH 值下，与聚合物单元配合物的 Cu2+ 的有效配位数降低，从而导致纳米颗粒形成速率的显着增加。正如透射电子显微镜所证明的那样，使用聚（丙烯酸）-聚乙烯基咪唑-Cu2+ 复合物作为前体可以控制纳米颗粒的尺寸并促进空间有序超分子结构的组装。正如动态光散射所揭示的那样，降低介质 pH 值会导致聚（丙烯酸）-聚乙烯基咪唑-Cu2+ 颗粒的成熟。所获得的结果为 pH 值对辐照悬浮液中纳米粒子的空间组织的强烈影响提供了证据。在酸性较低的介质（pH 3）的情况下，纳米粒子的组装发生在松散的共聚体粒子中，而在较低的 pH 值下，金属纳米粒子在完美的大分子纳米结构的模板中产生。