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Titration of Surface Modified Pigment Particles

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Surface modified pigments are playing an increasingly important role in high performance inkjet inks. Titration has been developed as a quantitative tool to evaluate pigment particles bearing weak acid or base functional groups. The value of total titratable groups in mmol/g pigment indicates the level of surface modification. The dissociation constants (pKa or pKb), which can be derived from the mathematical treatment of the titration curve, provide an insight into the colloidal stability as a function of pH. Titration studies of pigment particles have been reported before; however, due to poorly determined functional groups, data interpretation has been difficult. Cabot's surface modification technology, which introduces specific functional groups to the pigment surface, provides a unique opportunity for a systematic investigation. In this paper, a range of surface modified pigment particles has been investigated. The impact of ionic strength (Im), inkjet ink components, and the nature of the surface functional groups have been studied and related to the pigment stability. The discrepancy between apparent pK (as measured experimentally) and the functional group pK is explained using a diffuse double layer (DDL) correction term. Using this method, the stability of the pigment dispersions can be better understood and the ability to destabilize these systems in a controlled manner through pH, ionic strength, or other environmental changes can be anticipated.
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Document Type: Research Article

Publication date: 2004-01-01

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  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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