Ceramic encapsulation with polymer via co-axial electrohydrodynamic jetting.
Co-flowing media of a polymeric solution (30 wt% polymethylsilsesquioxane in ethanol) and a ceramic suspension (10 wt% alumina in glycerol) were subjected to an electric field. The flow rates of the media (10-30 microL min(-1)) and the applied voltage (0-11 kV) were varied systematically during the experimentation by making gradual increments to each variable, which enabled the construction of a mode selection map. Under co-flowing conditions, with the flow rate of polymer solution (outer needle) twice that of the ceramic suspension (inner needle), encapsulated droplets of polymer-coated alumina were produced within stable cone-jet mode. These were collected in a thin film of water and the resultant particle size varied between 1 and 38 microm. Encapsulation was confirmed with scanning electron microscopy and element analysis.
Nangrejo
M
M
Department of Mechanical Engineering, University College London, Torrington Place, London WC1E7JE, UK. m.nangrejo@ucl.ac.uk
Ahmad
Z
Z
Edirisinghe
M
M
D000537:Aluminum Oxide / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D004339:Drug Compounding / Q000295:instrumentation / Q000379:methods*; D004563:Electrochemistry / Q000295:instrumentation; D004867:Equipment Design; D017646:Organosilicon Compounds / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*
D017646:Organosilicon Compounds; D011108:Polymers; C532869:polymethylsilsesquioxane; D000537:Aluminum Oxide