Citation: HENG Xiao-Ping, YANG Han, HU Jia-Wen. pH-Induced Concentration and Preservation of Zwitterion-Modified ld Nanoparticles[J]. Acta Physico-Chimica Sinica, ;2013, 29(02): 319-326. doi: 10.3866/PKU.WHXB201211263 shu

pH-Induced Concentration and Preservation of Zwitterion-Modified ld Nanoparticles

1.
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China

Received Date: 15 October 2012
Available Online: 26 November 2012
Fund Project: 国家自然科学基金(20603008, 20873037, 91027037)资助项目 (20603008, 20873037, 91027037)

In this work, the stability and reversible aggregation properties of zwitterion-modified Au nanoparticles (Au NPs) were studied under acidic and alkaline conditions. The UV-Vis spectra of the Au colloids were measured under different conditions, and the stability and reversible aggregation properties of the Au colloids were revealed through the spectral changes. The results showed that the modification with zwitterionic ligands largely improved the stability of the Au NPs under both acidic and alkaline conditions. Under strongly acidic conditions, the modified Au NP colloids lost stability and aggregated, but the aggregated colloids could be redispersed once the pH of the colloids was returned to an appropriate value. By exploiting their pH-dependent reversible aggregation properties, dilute Au NP colloids were concentrated to give concentrated Au NP colloids or solid Au NP aggregates; these systems could be preserved for long periods of time, and if needed, could be recovered to give well-dispersed dilute dispersions simply by adding water.
- ld nanoparticle,
- Stability,
- Reversibility,
- Concentration,
- Preservation
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沈阳化工大学材料科学与工程学院沈阳 110142