AFM SILICA-PROBING OF CHARGE DISTRIBUTION ON QUARTZ (0001) AND SAPPHIRE (0001) SURFACESA

Abstract

A quantitative prediction of the interactions between surfaces in electrolyte solutions is extremely important in numerous physico-chemical systems. Experimental in-situ measurements of these interactions are now possible with AFM down to sub-nanonewton levels. The current methods, whether electrophoretic or titration origin, provides only an average charge or potential value for the system under consideration. In this study, AFM was employed to estimate the surface charge or potential distribution of selected metal oxides using a silica colloid probe. The surface maps obtained show very good agreement with the average charge/potentials values from the literature and recent work.

Keywords

• AFM silica probing,charge distribution,quartz,sapphire

References

1. Bergström,L., Ad. Colloid and Interface Science. 70 (1997) 125.
2. Binnig, G., Quate, .C. F., Gerber, Ch.,Phys. Rev. Lett. 56 (1986) 930.
3. Butt, H., Biophys. J. 60 (1991) 1438.
4. Butt, H., Kappl, M., Surface and Interfacial Forces, WILEY-VCH Verlag GmbH, Weinheim, 2010.
5. Derjaguin, B.V., Landau, L., Physicochim. URSS 14 (1941) 633.
6. Ducker, W.A. Senden, T.J. Pashley, R.M. Nature. 353 (1991) 239.
7. Franks, G.V., Meagher, L., Colloids and Surfaces A. Physicpchem. Eng. Aspects. 214 (2003) 99
8. Hoek , E. M. V Agarwal, G. K., J. Colloid Interface Sci. 298 (2006) 50.

9. Larson, I Drummond, C.J. Chan, D.Y.C Grieser, J. Am. Chem. Soc. 115 (1993) 11885.
10. Larson, I Drummond, C.J. Chan, D.Y.C Grieser, F., J. Am. Chem. Soc. 99 (1995) 2114.
11. Larson, I Drummond, C.J. Chan, D.Y.C Grieser, F., Langmuir. 13 (1997) 2109.
12. Meagher,L., Franks, G.V., Gee, M.L., J. Scales, Colloids and Surfaces A. Physicpchem. Eng. Aspects. 146 (1999) 123.
13. Nowostawska, U., Sander, S.G., Hunter, K.A., Colloids and Surfaces A. Physicpchem. Eng. Aspects. 266 (2005) 200.
14. Polat,M., Sato,K., Nagaoka, T., Watari, K., J. Colloid Interface Sci. 304 (2006) 378.
15. Polat, M., Polat, H., J. Colloid Interface Sci. 341 (2010) 178.
16. Sader, J.E, Chon, J.W.M, Mulvaney, P., Rev. Sci. Instrum. 70 (1999) 3967.
17. Verwey, E.J.W. , Overbeek, J.T.G., Theory and Stability of Lyophobic Colloids, Elsevier, Amsterdam, 1948.
18. Yelken, G.O., Polat, M., Applied Surf. Sci., 301, 2014, 149-155.