Controlling the thickness of hollow polymeric microspheres prepared by electrohydrodynamic atomization by Ming-Wei Chang, Eleanor Stride, and Mohan Edirisinghe Interface Volume 7(Suppl 4):S451-S460 August 6, 2010 ©2010 by The Royal Society

(a) The experimental set-up; (b) dripping and (c) stable jetting behaviour of PMSQ/PFH. Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

Diameter and shell thickness of microspheres versus varying flow rate of PMSQ and with PFH flow rate of 150 µl min−1 (error bars show standard deviation). Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

Effect of PMSQ flow rate on the geometry of the hollow microspheres: (a) 200; (b) 250; (c) 350; (d) 450; (e) 550; and (f) 650 µl min−1. Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

Scanning electron micrograph of a fractured hollow microsphere. Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

Size and shell thickness of microspheres versus PMSQ concentration with inner flow rates of 150 µl min−1 and outer flow rate of 300 µl min−1 (error bars show standard deviation). Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

Effect of 63 wt% PMSQ concentration on the process product: (a) SEM image of PFH-loaded PMSQ fibre; (b) optical image of PFH-loaded PMSQ fibre. Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

Size and shell thickness of microspheres versus applied voltage with inner flow rates of 150 µl min−1 and outer flow rate of 300 µl min−1 (error bars show standard deviation). Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

Mapping of applied voltage and flow rate of PMSQ at different PMSQ concentrations: (a) 18 wt%, (b) 27 wt% and (c) 36 wt%. Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

Variation of D/t ratio (α) with polymer concentration. Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society

FTIR spectra of PMSQ and dried hollow microspheres. Chang M et al. J. R. Soc. Interface 2010;7:S451-S460 ©2010 by The Royal Society