Robalino David Herrera, Durán Del Amor María Del Mar, Almagro Gómez Carmen María, Hernández Cifre José Ginés
Departamento de Química Física, Facultad de Química, Universidad de Murcia, 30100 Murcia, Spain.
Departamento de Ingeniería Química, Facultad de Química, Universidad de Murcia, 30100 Murcia, Spain.
Polymers (Basel). 2021 Nov 23;13(23):4066. doi: 10.3390/polym13234066.
The adsorption of the thermoresponsive positively charged copolymer poly(-isopropylacrylamide)-block-poly(3-acrylamidopropyl)trimethylammonium chloride, PNIPAAM-b-PAMPTMA(+), onto negatively charged gold nanoparticles can provide stability to the nanoparticles and make the emerging structure tunable by temperature. In this work, we characterize the nanocomposite formed by gold nanoparticles and copolymer chains and study the influence of the copolymer on the expected aggregation process that undergoes those nanoparticles at high ionic strength. We also determine the lower critical solution temperature (LCST) of the copolymer (around 42 °C) and evaluate the influence of the temperature on the nanocomposite. For those purposes, we use dynamic light scattering, UV-vis spectroscopy and transmission electron microscopy. At the working PNIPAAM-b-PAMPTMA(+) concentration, we observe the existence of copolymer structures that trap the gold nanoparticles and avoid the formation of nanoparticles aggregates. Finally, we discuss how these structures can be useful in catalysis and nanoparticles recovery.
热响应性带正电荷的共聚物聚（N-异丙基丙烯酰胺）-嵌段-聚（3-丙烯酰胺基丙基）三甲基氯化铵，PNIPAAM-b-PAMPTMA(+)，吸附到带负电荷的金纳米颗粒上，可以为纳米颗粒提供稳定性，并使形成的结构随温度可调。在这项工作中，我们表征了由金纳米颗粒和共聚物链形成的纳米复合材料，并研究了共聚物对那些纳米颗粒在高离子强度下发生的预期聚集过程的影响。我们还确定了共聚物的最低临界溶液温度（LCST）（约42°C），并评估了温度对纳米复合材料的影响。为了实现这些目的，我们使用动态光散射、紫外可见光谱和透射电子显微镜。在工作的PNIPAAM-b-PAMPTMA(+)浓度下，我们观察到存在捕获金纳米颗粒并避免形成纳米颗粒聚集体的共聚物结构。最后，我们讨论了这些结构如何在催化和纳米颗粒回收中发挥作用。
