Saini, R. K. ; Srivastava, A. K. ; Gupta, P. K. ; Das, K. (2011) pH Dependent reversible aggregation of Chitosan and glycol-Chitosan stabilized silver nanoparticles Chemical Physics Letters, 511 (4-6). pp. 326-330. ISSN 0009-2614
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.cplett.2011.06.044
Abstract
Aggregation behaviour of Chitosan and glycol-Chitosan stabilized silver nanoparticles was investigated over the pH range of 3.4-13. With increasing pH, the charge of the particle reduces and approaches zero beyond 6.5 (the pKa of the amino group) inducing aggregation that was confirmed by absorption spectroscopy, hyper-Rayleigh scattering (HRS) and TEM measurements. Interestingly the HRS intensity increased till pH 9.0 ± 2.0 and beyond this it dropped dramatically. This correlated with the formation of centrosymmetric spherical aggregates as evidenced by TEM pictures. The aggregation process was found to be reversible over at least 10 pH cycles by absorption and HRS measurements.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 83458 |
| Deposited On: | 21 Feb 2012 13:08 |
| Last Modified: | 21 Feb 2012 13:08 |
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