A double slit nozzle is used to refresh the air just above the surface of a thin layer of a suspension of PEDOT: PSS nano-particles. The evaporation rate increases locally where the air above the surface is refreshed. An accumulation of the suspended particles results underneath the nozzle when the solvent has completely evaporated. The goal of this work is to investigate how the airflow influences the deposition pattern of the colloidal material. This research is performed using experimental and numerical methods. The experimental results are studied by measuring a layer thickness profile using an absorption technique. The peak in the layer thickness profile which occurs underneath the nozzle becomes higher and narrower with increasing flow rates. The results from the simulation deviate from the experimental results because of limitations in the numerical model concerning the high concentrations of colloidal material in the liquid layer underneath the nozzle.
Airflow controlled evaporative solution deposition
Deuss, K. R. M. (Author). 30 Apr 2015
Student thesis: Master