Puniredd Sreenivasa Reddy, Wai Yong Keng, Satyanarayana N, Sinha Sujeet K, Srinivasan M P
Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576.
Langmuir. 2007 Jul 31;23(16):8299-303. doi: 10.1021/la0635707. Epub 2007 Jul 4.
The tribological properties of ultrathin films containing nanoparticles encapsulated in immobilized dendrimers are investigated. The films were formed by covalent molecular assembly in supercritical carbon dioxide, and the Au nanoparticles were formed in aqueous solution. End-capping of the terminal amine groups of the dendrimer by fluorinated species resulted in a reduction in the size of the nanoparticles formed. The resulting film structure displayed a lower coefficient of friction when the nanoparticles were formed after fluorination. The observed improvement in the tribological properties is attributed to the reduction in agglomeration of the nanoparticles due to the presence of the fluorine moieties.
研究了含有固定在树枝状大分子中的纳米颗粒的超薄膜的摩擦学性能。这些薄膜通过在超临界二氧化碳中进行共价分子组装形成，而金纳米颗粒则在水溶液中形成。用氟化物种对树枝状大分子的末端胺基进行封端导致所形成的纳米颗粒尺寸减小。当纳米颗粒在氟化后形成时，所得的薄膜结构显示出较低的摩擦系数。观察到的摩擦学性能的改善归因于由于氟部分的存在而导致的纳米颗粒团聚的减少。
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