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Novel titration method for surface-functionalised silica

2010; Elsevier BV; Volume: 257; Issue: 7 Linguagem: Inglês

10.1016/j.apsusc.2010.10.025

1873-5584

Kai Hofen, H. Wéber, Chiu Chan, Peter Majewski,

Analytical Chemistry and Sensors

This paper describes three inexpensive and fast analytical methods to characterise grafted particle surfaces. The reaction of silica with (3-aminopropyl)triethoxysilane, (3-mercaptopropyl)trimethoxysilane and N-(phosphonomethyl)iminodiacetic acid hydrate, respectively, leads to NH2-, SO3H- or COOH-functionalised silica, which were characterised by X-ray photoelectron spectrometry and titration in nonaqueous media as well as with two titration methods in a water-based environment. In the work presented, factors influencing the titrations are pointed out and solutions are presented to overcome these limiting factors are shown.