Abstract
Well-dispersed Ag nanoparticles with size of 20–30 nm were synthesized in water at room temperature with a self-made novel imidazoline Gemini surfactant quaternary ammonium salt of di (2-heptadecyl-1-formyl aminoethyl imidazoline) hexanediamine. Transmission electron microscopy, X-ray powder diffraction, ultraviolet-visible absorption spectra, and Fourier transform infrared ray were used to characterize the Ag nanoparticles. Results showed that the micellized aggregation of imidazoline Gemini surfactant in water, the growth of Ag initial particles, and the interaction (adsorption and coordination) between surfactant and Ag+/Ag nanoparticles took place simultaneously to form the well-dispersed Ag nanoparticles. Catalytic results show that the surface-modified Ag product was an active metal catalyst for methyl orange reduction reaction due to the effective adsorption between Ag nanoparticles and methyl orange molecules, which was of promising application in environmental protection.
Highlights
In recent years, metal nanoparticles have been studied extensively due to their noticeable electrical, optical, and catalytic properties [1,2,3,4]
When 2 g·L−1 SHAEIHDI is used as shown in Figure 2(b), Ag nanoparticles with diameter of 50–100 nm have been obtained with improved dispersion
Further increasing the surfactant concentration to 4 g·L−1 shown in Figure 2(c) can give rise to the formation of better-dispersed Ag nanoparticles with diameter of 30–50 nm
Summary
Metal nanoparticles have been studied extensively due to their noticeable electrical, optical, and catalytic properties [1,2,3,4]. As one of the traditional noble metals, Ag nanoparticles have been synthesized for various applications, such as biomedical antibacterial materials [5, 6], catalysis [1, 7, 8], tribology [9], and surface-enhanced Raman scattering (SERS) [10,11,12]
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