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Determination of the Colloidal Stability of Concentrated Pigment Dispersions

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Pigment dispersions are playing an increasingly important role in high performance inkjet inks. Colloidal stability of pigment particles can have a profound effect on print head and paper printing performance. Reliable and quick analytical methods to assess colloidal stability are essential in any development effort. Commonly accepted practice calls for aging the sample under accelerated conditions and then measuring the changes in particle size distribution. Widely applied particle sizing techniques require samples to be diluted. Dilution can disturb the system and the results may not reflect the concentrated state. In this report we explored the possibility of using an accelerated centrifugation method to evaluate colloidal stability without dilution. The instrument for this study is LUMiFuge® In this study, the colloidal stability of pigment dispersions as function of pH and ionic strength were successfully determined without dilution and aging. Particularly intriguing, the LUMiFuge method can discern the difference among samples that the traditional methods had failed. This manuscript will also discuss the limitation of LUMiFuge® Our study strongly indicated that this is an extremely sensitive method to evaluate colloidal stability of dispersions at their original concentration. When LUMiFuge® results are correlated to the performance of pigmented inkjet inks, it can serve as a valuable tool for both research development and quality control and assurance.

Document Type: Research Article

Publication date: January 1, 2005

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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