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- W2043965650 abstract "Schematic illustration showing the adsorption of a cationic surfactant on a MSA-modified Au particle and its behavior at the air/water interface. ▶ MSA renders an Au surface with carboxylic groups. ▶ Carboxylic groups react with a cationic surfactant. ▶ Desorption of surfactant into water results in a hydrophilic region. Gold nanoparticles were prepared by two different methods. The first method was chemically grafting the particles with different lengths of alkylthiol (C 6 SH, C 12 SH and C 18 SH). For the second method, the Au particles were surface modified first by mercaptosuccinic acid (MSA) to render a surface with carboxylic acid groups which play a role to physically adsorb cationic surfactant in chloroform. This method was termed physical/chemical method. In the first method, the effects of alkyl chain length and dispersion solvent on the monolayer behavior of surface modified gold nanoparticles was evaluated. The gold nanoparticles prepared by 1-hexanthiol demonstrated the narrowest size distribution. Most of them showed narrower particle size distributions in chloroform than in hexane. For the physical/chemical method, the particles can spread more uniformly on the water surface which is attributed to the amphiphilic character of the particles at the air/water interface. However, the particles cannot pack closely due to the relatively weak particle–particle interaction. The effect of alkyl chain length was also assessed for the second method." @default.
- W2043965650 created "2016-06-24" @default.
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- W2043965650 date "2011-01-01" @default.
- W2043965650 modified "2023-10-17" @default.
- W2043965650 title "Surface modification of gold nanoparticles and their monolayer behavior at the air/water interface" @default.
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- W2043965650 doi "https://doi.org/10.1016/j.apsusc.2010.10.057" @default.
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