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Open AccessArticle

Parallel Droplet Deposition via a Superhydrophobic Plate with Integrated Heater and Temperature Sensors

Institute for Microelectronics and Microsensors, Johannes Kepler University Linz, 4040 Linz, Austria
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Micromachines 2020, 11(4), 354; https://doi.org/10.3390/mi11040354
Received: 3 March 2020 / Revised: 24 March 2020 / Accepted: 27 March 2020 / Published: 28 March 2020
(This article belongs to the Special Issue MFHS 2019)
A simple setup, which is suitable for parallel deposition of homogenous liquids with a precise volume (dosage), is presented. First, liquid is dispensed as an array of droplets onto a superhydrophobic dosage plate, featuring a 3 × 3 array of holes. The droplets rest on these holes and evaporate with time until they are small enough to pass through them to be used on the final target, where a precise amount of liquid is required. The system can be fabricated easily and operates in a highly parallel manner. The design of the superhydrophobic dosage plate can be adjusted, in terms of the hole positions and sizes, in order to meet different specifications. This makes the proposed system extremely flexible. The initial dispensed droplet mass is not significant, as the dosing takes place during the evaporation process, where the dosage is determined by the hole diameter. In order to speed up the evaporation process, microheaters are screen printed on the back side of the dosage plate. To characterize the temperature distribution caused by the microheaters, temperature sensors are screen printed on the top side of the dosage plate as well. Experimental data regarding the temperature sensors, the microheaters, and the performance of the setup are presented, and the improvement due to the heating of the dosage plate is assessed. A significant reduction of the total evaporation time due to the microheaters was observed. The improvement caused by the temperature increase was found to follow a power law. At a substrate temperature of 80 °C, the total evaporation time was reduced by about 79%. View Full-Text
Keywords: screen printing; droplet evaporation; dosage; resistance temperature detector; heated substrate screen printing; droplet evaporation; dosage; resistance temperature detector; heated substrate
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MDPI and ACS Style

Hintermüller, M.A.; Offenzeller, C.; Knoll, M.; Tröls, A.; Jakoby, B. Parallel Droplet Deposition via a Superhydrophobic Plate with Integrated Heater and Temperature Sensors. Micromachines 2020, 11, 354.

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