Thermoswitchable Janus Gold Nanoparticles with Stimuli-Responsive Hydrophilic Polymer Brushes

详细信息    查看全文

• 作者：Xiaoqin Niu ; Fen Ran ; Limei Chen ; Gabriella Jia-En Lu ; Peiguang Hu ; Christopher P. Deming ; Yi Peng ; Mauricio D. Rojas-Andrade ; Shaowei Chen
• 刊名：Langmuir
• 出版年：2016
• 出版时间：May 3, 2016
• 年：2016
• 卷：32
• 期：17
• 页码：4297-4304
• 全文大小：507K
• 年卷期：0
• ISSN：1520-5827

文摘

Well-defined thermoswitchable Janus gold nanoparticles with stimuli-responsive hydrophilic polymer brushes were fabricated by combining ligand exchange reactions and the Langmuir technique. Stimuli-responsive polydi(ethylene glycol) methyl ether methacrylate was prepared by addition–fragmentation chain-transfer polymerization. The polymer brushes were then anchored onto the nanoparticle surface by interfacial ligand exchange reactions with hexanethiolate-protected gold nanoparticles, leading to the formation of a hydrophilic (polymer) hemisphere and a hydrophobic (hexanethiolate) one. The resulting Janus nanoparticles showed temperature-switchable wettability, hydrophobicity at high temperatures, and hydrophilicity at low temperatures, due to thermally induced conformational transition of the polymer ligands. The results further highlight the importance of interfacial engineering in the deliberate functionalization of nanoparticle materials.