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Variation of the surface charge of silica particles by functionalised self-assembled monolayers

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In this study the synthesis of functionalized self-assembled monolayers (SAMs) with SH, SO3H, NH2 and CN functionality onto silica particles and their properties has been studied and characterized by infrared spectroscopy, time-of-flight secondary ion mass spectrometry (ToF-SIMS) and measurement of the ζ potential of the resulting powder. The infrared and ToF-SIMS measurements of the samples clearly show the presence of CH2 goups and the various functionalized head groups of the SAMs, indicating a successful deposition of the SAMs onto the silica particles. The measurements of the ζ potential of the samples show clear variations of their ζ potential depending on the type of SAM compared to the ζ potential of the pure silica powder used in this study. Even positive ζ potential could be measured for silica powder coated with NH2 and CN SAM.

Affiliations: 1: Ian Wark Research Institute, University of South Australia, Mawson Lakes Boulevard, Mawson Lakes, SA 5095, Australia


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