Electrospray has been widely used in microanotechnology which deposit microanoscale particles on planar surfaces. However, in conventional electrospray approach the distribution of these particles patterned on the collecting surface is poorly controlled. This work introduces a programmable patterning method of electrospray, which microparticles are sprayed on micropatterned collecting chips. By manipulating the local electrical field using a combination of activated and floating electrodes, a good spatial contrast of microparticle patterning is obtained. In addition, the size-dependent contrast enhancement is demonstrated using a series of electrode arrays with different electrode patterns. Combined with encapsulation technique, this unique electrospray method promises potential applications in the field of functional cell/tissue engineering.
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