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Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers

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High-shear-rate capillary viscometer for inkjet inks.

Xi Wang¹, Wallace W Carr, David G Bucknall

¹FUJIFILM Dimatix, Inc., Lebanon, New Hampshire 03766, USA.

The Review of Scientific Instruments

|July 2, 2010

Summary

This summary is machine-generated.

A novel capillary viscometer accurately measures inkjet ink viscosity at high shear rates. Particle loading significantly impacts high-shear viscosity, even for inks with similar low-shear properties.

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Area of Science:

Rheology
Fluid Dynamics
Materials Science

Background:

Inkjet printing requires precise control of ink rheological properties.
High shear rates during printing necessitate specialized viscosity measurement techniques.
Understanding shear-dependent viscosity is crucial for optimizing inkjet ink formulations.

Purpose of the Study:

To develop and validate a capillary viscometer for measuring apparent shear viscosity of inkjet inks.
To determine true shear viscosity and shear rate relationships using the Weissenberg-Rabinowitsch equation.
To investigate the influence of particle loading on the high-shear-rate viscosity of inkjet inks.

Main Methods:

Development of a capillary viscometer with a constant-flow generator, pressure monitoring, and submillimeter capillary die.
Calibration of the viscometer using standard Newtonian silicone oil.
Application of the Weissenberg-Rabinowitsch equation to obtain true shear viscosity from apparent measurements.
Fitting experimental data to the Cross model.

Main Results:

The developed viscometer accurately measures viscosity at apparent shear rates up to 2 x 10(5) s(-1).
The Cross model effectively describes the shear-rate-dependent viscosity of carbon-black pigmented water-based inkjet inks.
Significant differences in high-shear-rate viscosity were observed between inks with similar low-shear-rate viscosities, attributed to particle loading.

Conclusions:

The capillary viscometer is a reliable tool for characterizing inkjet ink rheology at high shear rates.
Particle loading is a critical factor influencing the high-shear-rate performance of inkjet inks.
This research provides valuable insights for formulating inkjet inks with tailored rheological behavior for optimal printing performance.