Hydrophobic surfaces of spin-assisted layer-by-layer assembled polyelectrolyte multilayers doped with copper nanoparticles and modified by fluoroalkylsilane
Hydrophobic surfaces of spin-assisted layer-by-layer assembled polyelectrolyte multilayers doped with copper nanoparticles and modified by fluoroalkylsilane
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DOI：
10.1016/j.apsusc.2008.10.102
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发表时间：
2009-01
影响因子：
6.7
通讯作者：
Guangbin Yang;Laigui Yu;Xinhua Chen;Ping-yu Zhang
中科院分区：
文献类型：
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作者：
Guangbin Yang;Laigui Yu;Xinhua Chen;Ping-yu Zhang
采用自旋辅助层层组装技术制备了聚电解质多层膜（PEM），并将其作为纳米反应器原位合成了Cu纳米粒子，制备了Cu纳米粒子掺杂的复合材料，称为Cu-纳米粒子PEM。因此，PEMs内的化学反应是通过一系列的反应循环引发的，其中Cu 2+被吸收到聚合物涂覆的硅衬底中并在NaBH 4溶液中被还原。采用低表面能的十七烷基三甲氧基硅烷（FAS-17）对纳米铜粒子进行表面改性，形成疏水膜。利用原子力显微镜研究了疏水膜的附着力和纳米摩擦行为，利用UMT-2试验机研究了疏水膜在干油和蒸馏水润滑条件下与不锈钢摩擦的宏观摩擦学行为.结果表明，经FAS-17改性的纳米铜质子交换膜比未改性的纳米铜质子交换膜具有更低的摩擦系数和更高的附着力。在相同条件下，疏水膜比亲水膜具有更低的水润滑摩擦系数和更高的干摩擦系数，这可能主要是由于表面能的差异。该疏水膜具有低粘附力和低摩擦力，在微纳机电系统中具有潜在的应用前景。
Polyelectrolyte multilayers (PEMs) fabricated by spin-assisted layer-by-layer assembly technique were used as nanoreactors for in situ synthesis of Cu nanoparticles, allowing generation of Cu nanoparticles doped composite, denoted as Cu-nanoparticles PEMs. Thus chemical reaction within the PEMs was initiated by a series of reaction cycles in which Cu2+was absorbed into the polymer-coated silicon substrate and reduced in NaBH4solution. The surface of Cu-nanoparticles PEMs was modified by heptadecafluorodecyl-trimethoxysilane (FAS-17) with low surface energy, generating a hydrophobic film. The adhesion and nano-friction behavior of the hydrophobic film was investigated using an atomic force microscope, while its macro-tribological behavior sliding against stainless steel under dry- and distilled-water-lubricated conditions was investigated using a UMT-2 test rig. It was found that Cu-nanoparticles PEMs modified with FAS-17 has a lower friction and higher adhesion than that without modification. Moreover, the hydrophobic film possesses lower friction coefficient under water-lubrication and higher friction coefficient under dry-sliding than the hydrophilic film under the same conditions, which could be mainly due to the difference in the surface energy. The titled hydrophobic films with low adhesion and friction would have potential application in micro/nano-electro-mechanical systems.