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Coagulation Kinetics of Surface Modified Pigment Particles

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Pigment particle coagulation is an important step in the formation of an inkjet image. The size of the formed colorant flocs determines how deeply the colorant penetrates into the substrate and hence has a significant impact on image quality (optical density, gloss, chroma, etc.). Many factors (e.g. charge density) determine the colorant coagulation rate and an in-depth understanding of these factors is needed to assist in the design of advanced colorants for inkjet applications. This study focused on a series of pigment particles that had been chemically modified using Cabot's patented surface modification technology. When the pigment was de-stabilized under various triggering conditions, such as ionic strength and pH, particles started to coagulate. The rate of coagulation was measured by monitoring the time evolution of the floc size as determined by dynamic light scattering (DLS). A characteristic coagulation time, τ, was derived from fitting the DLS data. The impact of trigger condition and surface modification type on the coagulation time, τ, was determined and provides critical insight as to how the pigment coagulation can be controlled to yield optimal print performance.
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Document Type: Research Article

Publication date: 2002-01-01

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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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