Wiping out the coffee-ring effect advances inkjet printing of electronic circuitsJanuary 28th, 2008 in Chemistry /
Examples of printed line behaviors from inkjet printers: (a) individual drops, (b) scalloped, (c) uniform, (d) bulging, and (e) stacked coins. Credit: Courtesy of the American Chemical Society
Researchers in California report a key advance in efforts to use inkjet printing technology in the manufacture of a new generation of low cost, high-performance electronic circuits for flexible video displays and other products. Their study, which describes development of a new method for producing straighter, uniform circuits using inkjet-printing, is scheduled for the March 4 issue of ACS’ Langmuir.
In the report, Dan Soltman and Vivek Subramanian note that inkjet-printed circuits must be extremely smooth and straight. That difficult feat has been elusive because the drop-by-drop nature of inkjet-printing often leaves uneven printed features on surfaces, especially a circular pattern known as the “coffee ring” effect, they note.
The scientists describe a new way to optimize printing conditions to eliminate the coffee-ring effect and produce smooth, narrow lines with an even edge. The development demonstrates the feasibility of tuning and optimizing inkjet technology for microelectronic applications, they say.
"Wiping out the coffee-ring effect advances inkjet printing of electronic circuits." January 28th, 2008. http://phys.org/news120747499.html