Superhydrophobic surface, as a promising micro/nano material, has tremendous applications in biological and artificial investigations. The electrohydrodynamics (EHD) technique is a versatile and effective method for fabricating micro- to nanoscale fibers and particles from a variety of materials. A combination of critical parameters, such as mass fraction, ratio of N, N-Dimethylformamide (DMF) ...

Electrospinning is a process in which solid fibers are produced from a polymeric fluid stream ~solution or melt! delivered through a millimeter-scale nozzle. The solid fibers are notable for their very small diameters ~,1 mm!. Recent experiments demonstrate that an essential mechanism of electrospinning is a rapidly whipping fluid jet. This series of papers analyzes the mechanics of this whippi...

This paper reviews the teaching and research career of the late Professor James R. Melcher. It describes his approach to the teaching of electric and magnetic fields bolstered by the lecture demonstrations he had developed. He is considered the founder of the modern day field of electrohydrodynamics. His undergraduate courses, reinforced by educational films which are briefly described, gave st...

We study numerically the deformation of sessile dielectric drops immersed in a second fluid when submitted to the optical radiation pressure of a continuous Gaussian laser wave. Both drop stretching and drop squeezing are investigated at steady state where capillary effects balance the optical radiation pressure. A boundary integral method is implemented to solve the axisymmetric Stokes flow in...

This paper discusses recent items of progress in understanding liquid-metal ion source (LMIS) behaviour, in the more general context of electrohydrodynamics. (1) Like the Taylor-Gilbert cone, the phenomenon of the vem conrracta has been known for several hundred years. It is argued that the cusp-on-a-cone shape of an operating LMIS is a similar phenomenon, except that the forces acting are elec...

As a droplet moves, due to evaporation at the surface, the droplet size is gradually reduced. Due to decreasing the size of the droplets moving in the spray core, the surface charges become closer and the repulsive force between the charges increases. When the Coulombic force overcomes the surface tension force (Rayleigh instability) the droplet breaks into smaller droplets (Coulomb fission). T...