Preparation and Stability of Gemini Surfactant Modified Gold Nanofluids†

doi:10.7503/cjcu20170150

Abstract

Abstract:

1,4-Bis(N-tetradecyl-N,N-dimethylammonium) propane bromide(G14-4-14) was used as surface modifying reagents for preparation of gold nanofluids in one-step with ascorbic acid as reducing agent and a mixture of petroleum ether/n-butanol as the solvent. Stable oil- or water-based nanofluids containing gold were prepared at different temperatue. The morphology, size and UV-Vis spectra of gold nanoparticles were characterized. When the pH value was 7—8 and the temperature was 0—4 ℃, the hydrophobic and uniform gold nanoparticles were prepared with good dispersity. The effects of polar organic solvents and heating temperature on the stability of gold nanoparticles were presented. If the amount(volume fraction) of polar solvent added was more than 30%, it had significant influence on the stability of the nanofluid. The thermally stable time of gold nanoparticles was shortened as the heating temperature increased.

Key words: Nanofluid, Gold nanoparticles, Gemini surfactant, Stability

CLC Number:

O645

TrendMD:

LI Dan, WU Qian, LIU Li, SUN Xiaori, GUO Meng, FENG Yimin. Preparation and Stability of Gemini Surfactant Modified Gold Nanofluids^†[J]. Chem. J. Chinese Universities, 2017, 38(10): 1829.

Figures/Tables 5

Fig.1 TEM images(A1, B1) and size distributions(A2, B2) of gold nanoparticles modified with G14-4-14(A1), (A2) pH=7—8, ice baths; (B1), (B2) pH=7—8, 90 ℃.

Fig.2 UV-Vis spectra of oil-based Au nanofluid(a) and water-based Au nanofluid(b) Inset is photographs of gold nanofluids.

Fig.3 UV-Vis spectra of Au/n-heptane nanofluids with different concentrations(A) and linear relationship between absorbance at 522 nm and concentration of Au/n-heptane nanofluids(B)Concentration of Au/n-heptane nanofluids/(g·mL-1): a. 0.01; b. 0.02; c. 0.04; d. 0.05; e. 0.08; f. 0.10; g. 0.12.

Fig.4 Changes of UV-Vis absorption spectra of gold nanofluids after adding the polar organic solventsa. Nanofluid; b. +30%Ethanol; c. +50%Ethanol; d. +50%Acetone; e. +30%Acetone; f. +30%Methanol; g. +50%Methanol.

Fig.5 Thermal stability of oil-based gold nanofluidsTemperature/℃: a. 130; b. 140; c. 150; d. 160.

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