Department of Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005, Punjab, India.
Phys Chem Chem Phys. 2014 Mar 14;16(10):4728-39. doi: 10.1039/c3cp55079f.
Micelles of the star shaped block polymers "tetronics" were employed for the synthesis of gold (Au) nanoparticles (NPs) under the effect of pH and temperature variation. The presence of the diamine core in the tetronic macromolecule made its micelles highly pH responsive, thereby dramatically altering the physiochemical properties. Likewise, a high degree of hydration made the micelles temperature sensitive. UV-visible studies, transmission electron microscopy (TEM), gel electrophoresis, and structure optimization by energy minimization were applied to understand the physiochemical aspects of tetronic micelles and their further role in the synthesis of Au NPs. Synthesis of Au NPs was triggered by the surface cavities of the micelles and hence the NPs simultaneously adsorbed on the micelle surface. Low pH induced high hydration and temperature responsive well defined vesicular morphologies bearing Au NPs, while high pH produced mainly large and compact compound micelles carrying NPs. Both pH and temperature responsive behaviors of different tetronics significantly influenced the synthesis of Au NPs and thus demonstrated their ability to act as nanoreactors for the materials synthesis under different experimental conditions.
星形嵌段聚合物“四元醇”的胶束被用于在 pH 值和温度变化的影响下合成金 (Au) 纳米粒子 (NPs)。四元醇大分子中存在的二胺核使其胶束对 pH 值具有高度响应性，从而显著改变了物理化学性质。同样，高度的水合作用使胶束对温度敏感。应用紫外-可见研究、透射电子显微镜 (TEM)、凝胶电泳和通过能量最小化进行结构优化来理解四元醇胶束的物理化学方面及其在 Au NPs 合成中的进一步作用。Au NPs 的合成是由胶束的表面腔触发的，因此 NPs 同时吸附在胶束表面上。低 pH 值诱导高水合和温度响应的良好定义的囊泡形态，带有 Au NPs，而高 pH 值主要产生带有 NPs 的大而紧凑的复合胶束。不同四元醇的 pH 值和温度响应行为显著影响 Au NPs 的合成，从而证明它们能够在不同实验条件下作为纳米反应器用于材料合成。
