August 2006

Conference Paper

Surface Chemistry and Water Dispersability of Carbon Black Materials

By:
Contescu, Cristian I; Baker, Frederick S; Burchell, Timothy D
Page Number:
4D5
Book Title:
Extended Abstracts, The International Conference on Carbon 2006
Publication Date:
August 2006
Conference Name:
Carbon 2006 International Carbon Conference
Conference Location:
Aberdeen, United Kingdom
Conference Sponsor:
British Carbon Group

Abstract

Formulation of water-stable carbon black dispersions is a double-sided task, which requires selection of a proper dispersing agents and matching it with the properties of a specific carbon black. Among other properties that affect water dispersability of carbon blacks (particle size, surface area, and aggregate structure), surface chemistry plays a prime-order role. We have characterized physical and chemical properties of several carbon black materials, and correlated them with the stability of dispersions formed with ionic and non-ionic surfactants. In particular, chemical characterization of surface functional groups on carbon blacks based on potentiometric titration measurements (pKa spectra) provided a comprehensive picture of pH effects on dispersion stability. The results obtained were complemented by information from physical characterization methods, such as XPS and FTIR. The selection of a suitable dispersing agent able to withstand large pH variations will be discussed.