Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 30, Issue 1, Pages 59-64Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.201100061
Keywords
nanogold catalysis; cationic surfactant; phosphomolybdic acid; spectrophotometry
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Funding
- National Natural Science Foundation of China [21075023, 20965002, 20865002]
- Natural Science Foundation of Guangxi [0991021z]
- Research Funds of Guangxi Water Conservancy
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In the pH 7.4 Na2HPO4-NaH2PO4 buffer solution, the cationic surfactant (CS) interacted with nanogold particles (NG) to form NG aggregations (NGA) that resulted in its color changing from wine red to blue-violet. NG has a strong catalysis on the formic acid-phosphomolybdic acid (PMo) colored reaction, but that of the NGA catalysis is weak. With the increase of CS concentration, the NGA increased and the NG decreased, the catalysis decreased and the absorption value at 700 nm decreased linearly. The concentrations of 6.25-250 nmol/L tetradecyl dimethyl benzyl ammonium chloride (TDBAC), 0.625-250 nmol/L cetyltrimethyl ammonium bromide (CTMAB) and 12.5-500 nmol center dot L-1 dodecyldimethylbenzyl ammonium chloride (DDBAC) had good linear responses to the decreased absorption value (Delta A(700 nm)), with molar absorption coefficients of 2.2x10(6), 2.1x10(6) and 9x10(5) L center dot mol-1 center dot cm-1 respectively. This method was simple, highly sensitive and low-cost.
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