TY - JOUR
T1 - Stability of Lines with Zero Receding Contact Angle Produced by Inkjet Printing at Small Drop Volume
AU - Yang, Jinxin
AU - Zheng, Fei
AU - Derby, Brian
N1 - Funding Information:
The authors acknowledge the Engineering and Physical Sciences Research Council (EPSRC) for funding this research through the following grant awards: The printing equipment in the Manchester Centre for Digital Fabrication through grant EP/L012022/1; this work was supported by the Henry Royce Institute for Advanced Materials, funded through grants EP/R00661X/1, EP/S019367/1, EP/P025021/1, and EP/P025498/1. J.Y. and F.Z. acknowledge support through graduate scholarships provided by the China Scholarship Council and the University of Manchester.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/1/4
Y1 - 2021/1/4
N2 - We present an experimental study of the maximum and minimum bounding drop spacing for a parallel-sided liquid line produced by inkjet printing with drop volumes of 1.5 and 8.5 pL, on substrates with advancing contact angles of 46 and 54°, and zero receding contact angle. The results are used to validate models of the limiting bounds for the formation of stable parallel-sided lines as a function of drop spacing and transverse printing speed. The model for the maximum drop spacing bound (minimum line width) shows a good agreement with our results, but, when used to predict the stable line width, there is an influence of printing speed not captured by the model. This is probably because of a coupling between printed drop volume and ejection velocity outside the scope of the model. The minimum drop spacing bound (maximum stable line width) is limited by a bulging instability, and our results agree with the existing model, except for printing with the largest drop volumes at low temperature. It is shown that under these conditions, there is a different mechanism for bulging that occurs after printing over a period of minutes, if the liquid bead is present on the surface for a significant period of time before drying. Our results suggest that this mechanism is possibly triggered by imperfections on the substrate.
AB - We present an experimental study of the maximum and minimum bounding drop spacing for a parallel-sided liquid line produced by inkjet printing with drop volumes of 1.5 and 8.5 pL, on substrates with advancing contact angles of 46 and 54°, and zero receding contact angle. The results are used to validate models of the limiting bounds for the formation of stable parallel-sided lines as a function of drop spacing and transverse printing speed. The model for the maximum drop spacing bound (minimum line width) shows a good agreement with our results, but, when used to predict the stable line width, there is an influence of printing speed not captured by the model. This is probably because of a coupling between printed drop volume and ejection velocity outside the scope of the model. The minimum drop spacing bound (maximum stable line width) is limited by a bulging instability, and our results agree with the existing model, except for printing with the largest drop volumes at low temperature. It is shown that under these conditions, there is a different mechanism for bulging that occurs after printing over a period of minutes, if the liquid bead is present on the surface for a significant period of time before drying. Our results suggest that this mechanism is possibly triggered by imperfections on the substrate.
U2 - 10.1021/acs.langmuir.0c01928
DO - 10.1021/acs.langmuir.0c01928
M3 - Article
SN - 0743-7463
VL - 37
SP - 26
EP - 34
JO - Langmuir
JF - Langmuir
IS - 1
ER -