Assessment of Dispersion of Ink Pigments

In this experiment, the sample is oscillated with an increasing stress known as an amplitude sweep and the storage and loss moduli are plotted against the shear stress. The moduli initially are independent of stress, giving a plateau known as the linear viscoelastic region (LVR). The length of the linear viscoelastic region shows how far the material can be deformed before the onset of structure breakdown.

Interpretation

Sample A gives a much shorter linear viscoelastic region (LVER) than Sample B and will therefore break down much more easily with vibrations and small movements. A long LVER indicates that the sample is more stable to oscillation stresses, and therefore strong associations have been formed between the particles.

For any single formulation, this gives an indication of how well dispersed the pigment is. From the results above, it can be seen that Sample A is not as well dispersed as Sample B.

Shear Stress vs. Complex Modulus for Two Samples.

Figure 1. Shear Stress vs. Complex Modulus for Two Samples.

Conclusion

A relatively quick amplitude sweep experiment can indicate the degree of dispersion of an ink and be used to optimise the dispersant dose and method. Unstable formulations can also be eliminated without the need for storage testing.

Measurement conditions

Sample: Ink pigments

Geometry: Cone and plate system 4˚/40 mm with a solvent trap system

Temperature: 20˚C

Stress amplitude sweep: 0.1 – 100 Pa Up Logarithmic

This information has been sourced, reviewed and adapted from materials provided by Malvern Panalytical.

For more information on this source, please visit Malvern Panalytical.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Malvern Panalytical. (2019, September 03). Assessment of Dispersion of Ink Pigments. AZoM. Retrieved on March 03, 2024 from https://www.azom.com/article.aspx?ArticleID=3933.

  • MLA

    Malvern Panalytical. "Assessment of Dispersion of Ink Pigments". AZoM. 03 March 2024. <https://www.azom.com/article.aspx?ArticleID=3933>.

  • Chicago

    Malvern Panalytical. "Assessment of Dispersion of Ink Pigments". AZoM. https://www.azom.com/article.aspx?ArticleID=3933. (accessed March 03, 2024).

  • Harvard

    Malvern Panalytical. 2019. Assessment of Dispersion of Ink Pigments. AZoM, viewed 03 March 2024, https://www.azom.com/article.aspx?ArticleID=3933.

Ask A Question

Do you have a question you'd like to ask regarding this article?

Leave your feedback
Your comment type
Submit
Azthena logo

AZoM.com powered by Azthena AI

Your AI Assistant finding answers from trusted AZoM content

Your AI Powered Scientific Assistant

Hi, I'm Azthena, you can trust me to find commercial scientific answers from AZoNetwork.com.

A few things you need to know before we start. Please read and accept to continue.

  • Use of “Azthena” is subject to the terms and conditions of use as set out by OpenAI.
  • Content provided on any AZoNetwork sites are subject to the site Terms & Conditions and Privacy Policy.
  • Large Language Models can make mistakes. Consider checking important information.

Great. Ask your question.

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.