Gold Nanorods as Nanoadmicelles: 1-Naphthol Partitioning into a Nanorod-Bound Surfactant Bilayer

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• 作者：Alaaldin M. Alkilany ; Rebecca L. Frey ; John L. Ferry ; Catherine J. Murphy
• 刊名：Langmuir
• 出版年：2008
• 出版时间：September 16, 2008
• 年：2008
• 卷：24
• 期：18
• 页码：10235-10239
• 全文大小：180K
• 年卷期：v.24,no.18(September 16, 2008)
• ISSN：1520-5827

文摘

As-prepared gold nanorods, stable in aqueous solution, bear a bilayer of the cationic surfactant cetyltrimethylammonium bromide (CTAB). This bilayer provides a ∼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 1-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 × 10³ molecules per gold nanorod, with an equilibrium binding constant of 1.97 ± 0.79 × 10⁴ M⁻¹ at room temperature.