Vishnevetskii Dmitry V, Polyakova Elizaveta E, Andrianova Yana V, Mekhtiev Arif R, Ivanova Alexandra I, Averkin Dmitry V, Alekseev Vladimir G, Bykov Alexey V, Sulman Mikhail G
Department of Physical Chemistry, Tver State University, Building 33, Zhelyabova Str., Tver 170100, Russia.
Institute of Biomedical Chemistry, 10 Building 8, Pogodinskaya Str., Moscow 191121, Russia.
Gels. 2024 Dec 9;10(12):809. doi: 10.3390/gels10120809.
In this study, novel anion photo-responsive supramolecular hydrogels based on cysteine-silver sol (CSS) and iodate anions (IO) were prepared. The peculiarities of the self-assembly process of gel formation in the dark and under visible-light exposure were studied using a complex of modern physico-chemical methods of analysis, including viscosimetry, UV spectroscopy, dynamic light scattering, electrophoretic light scattering, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. In the dark phase, the formation of weak snot-like gels takes place in a quite narrow IO ion concentration range. The visible-light exposure of these gels leads to an increase in their viscosity and dramatic change in their color. The morphology of gels alters after light irradiation that is reflected in the formation of a huge number of spherical/elliptical particles and the thickening of the fibers of the gel network. The interaction of CSS with IO anions has features of a redox process, which leads to the formation of silver iodide/silver oxide nanoparticles inside and on the surface of CSS particles. CSS possesses selectivity only to IO anions compared to many other inorganic ions relevant for humans and the environment. Thus, the CSS/IO system is non-trivial and can be considered as a novel low-molecular-weight gelator with photosensitive properties, as another way to produce silver iodide nanoparticles, and as a new approach for IO ion detection.
在本研究中，制备了基于半胱氨酸-银溶胶（CSS）和碘酸根阴离子（IO）的新型阴离子光响应超分子水凝胶。采用包括粘度测定法、紫外光谱法、动态光散射法、电泳光散射法、扫描电子显微镜法、能量色散X射线光谱法和X射线光电子能谱法在内的一系列现代物理化学分析方法，研究了在黑暗和可见光照射下凝胶形成的自组装过程的特点。在黑暗阶段，在相当窄的IO离子浓度范围内形成弱鼻涕状凝胶。这些凝胶在可见光照射下会导致其粘度增加和颜色发生显著变化。光照后凝胶的形态发生改变，表现为形成大量球形/椭圆形颗粒以及凝胶网络纤维变粗。CSS与IO阴离子的相互作用具有氧化还原过程的特征，这导致在CSS颗粒内部和表面形成碘化银/氧化银纳米颗粒。与许多其他与人类和环境相关的无机离子相比，CSS仅对IO阴离子具有选择性。因此，CSS/IO体系非同寻常，可被视为一种具有光敏性质的新型低分子量凝胶剂、制备碘化银纳米颗粒的另一种方法以及检测IO离子的新途径。
