Gold nanorods as nanoadmicelles: 1-naphthol partitioning into a nanorod-bound surfactant bilayer
Gold nanorods as nanoadmicelles: 1-naphthol partitioning into a nanorod-bound surfactant bilayer
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DOI：
10.1021/la8018343
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发表时间：
2008-09-16
期刊：
影响因子：
3.9
通讯作者：
Murphy, Catherine J.
中科院分区：
文献类型：
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作者：
Alkilany, Alaaldin M.;Frey, Rebecca L.;Murphy, Catherine J.
所制备的金纳米棒在水溶液中稳定，带有阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)的双层。这种双层膜提供了类似于3 nm厚的疏水层，可用于从水溶液中隔离疏水有机分子。我们用紫外-可见光谱和气相色谱火焰离子化检测技术研究了CTAB包覆的金纳米棒对1-萘酚的吸附行为。研究发现，I-萘酚在金纳米棒上的吸附等温线符合朗缪尔模型。1-萘酚分子的最大结合数为14.6+/-2.2×10(3)个/金纳米棒，室温下的平衡结合常数为1.97+/-0.79×10(4)M-1。
As-prepared gold nanorods, stable in aqueous solution, bear a bilayer of the cationic surfactant cetyltrimethylammonium bromide (CTAB). This bilayer provides a similar to 3 nm thick hydrophobic layer that could be used to sequester hydrophobic organic molecules from aqueous solution. We have investigated the uptake of 1-naphthol as a model hydrophobic compound by CTAB-coated gold nanorods using both ultraviolet-visible spectroscopy and gas chromatography with flame ionization detection. We find the adsorption isotherm of I-naphthol partitioning into the CTAB bilayer on gold nanorods fits the Langmuir model. The maximum number of bound 1-naphthol molecules is 14.6 +/- 2.2 x 10(3) molecules per gold nanorod, with an equilibrium binding constant of 1.97 +/- 0.79 x 10(4) M-1 at room temperature.