Velocity and size measurement of droplets from an ultrasonic spray coater using Photon Correlation Spectroscopy and Turbidimetry
- Resource Type
- Working Paper
- Authors
- Verding, Pieter; Deferme, Wim; Steffen, Werner
- Source
- Applied Optics, Vol. 59, Issue 25, pp. 7496-7503 (2020)
- Subject
- Condensed Matter - Materials Science
- Language
We have developed a combination of light scattering techniques to study and characterize droplets of a ultrasonic spray printer or coater in flight. For this economically relevant printer there is so far no reliable technique to systematically adjust the experimental parameters. We have combined photon correlation spectroscopy and turbidimetry to determine size and speed of the droplets depending on parameters of the printing process as viscosity, concentration and speed of the driving shroud gas. Our method allows to predetermine these parameters to control the properties of the printed films as e.g. thickness from tens of nanometers to micrometers.