Velgosova Oksana, Mačák Lívia, Múdra Erika, Vojtko Marek, Lisnichuk Maksym
Institute of Materials and Quality Engineering, Faculty of Materials Metallurgy and Recycling, Technical University of Kosice, Letná 9/A, 042 00 Kosice, Slovakia.
Division of Ceramic and Non-Metallic Systems, Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Kosice, Slovakia.
Polymers (Basel). 2023 Jan 10;15(2):379. doi: 10.3390/polym15020379.
The aim of the work was to prepare a polymer matrix composite doped by silver nanoparticles and analyze the influence of silver nanoparticles (AgNPs) on polymers' optical and toxic properties. Two different colloids of AgNPs were prepared by chemical reduction. The first colloid, a blue one, contains stable triangular nanoparticles (the mean size of the nanoparticles was 75 nm). UV-vis spectrophotometry showed that the second colloid, a yellow colloid, was very unstable. Originally formed spherical particles (11 nm in diameter) after 25 days changed into a mix of differently shaped nanoparticles (irregular, triangular, rod-like, spherical, decahedrons, etc.), and the dichroic effect was observed. Pre-prepared AgNPs were added into the PVA (poly(vinyl alcohol)) polymer matrix and PVA-AgNPs composites (poly(vinyl alcohol) doped by Ag nanoparticles) were prepared. PVA-AgNPs thin layers (by a spin-coating technique) and fibers (by electrospinning and dip-coating techniques) were prepared. TEM and SEM techniques were used to analyze the prepared composites. It was found that the addition of AgNPs caused a change in the optical and antibiofilm properties of the non-toxic and colorless polymer. The PVA-AgNPs composites not only showed a change in color but a dichroic effect was also observed on the thin layer, and a good antibiofilm effect was also observed.
这项工作的目的是制备一种掺杂银纳米颗粒的聚合物基复合材料，并分析银纳米颗粒（AgNPs）对聚合物光学和毒性特性的影响。通过化学还原制备了两种不同的AgNPs胶体。第一种胶体呈蓝色，含有稳定的三角形纳米颗粒（纳米颗粒的平均尺寸约为75纳米）。紫外可见分光光度法表明，第二种胶体呈黄色，非常不稳定。最初形成的球形颗粒（直径约11纳米）在25天后变成了不同形状纳米颗粒的混合物（不规则形、三角形、棒状、球形、十面体等），并观察到二向色性效应。将预先制备的AgNPs添加到PVA（聚乙烯醇）聚合物基体中，制备了PVA-AgNPs复合材料（掺杂Ag纳米颗粒的聚乙烯醇）。制备了PVA-AgNPs薄层（通过旋涂技术）和纤维（通过静电纺丝和浸涂技术）。使用TEM和SEM技术分析制备的复合材料。发现添加AgNPs导致了无毒无色聚合物的光学和抗生物膜特性发生变化。PVA-AgNPs复合材料不仅颜色发生了变化，而且在薄层上还观察到二向色性效应，并且还观察到良好的抗生物膜效应。
