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Controllable self-organization of colloid microarrays based on finite length effects of electrospun ribbons

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2015020366433345.pdf

abstract:

This paper presents a mechanoelectrospinning (MES)-assisted surface-tension driven self-organization
to provide a possible route towards inexpensive generation of large-scale ordered microarrays in a
controllable manner. To control the self-organization driven by surface tension and Plateau–Rayleigh
instability, finite length effects are utilized to manipulate the self-organizing processes and adjust the
competition between nucleation and free surface instability. We introduce fine ribbon-lattices to
determine the boundary conditions of ribbons to make use of the finite length effects. The ribbonlattices
are electrodeposited precisely by MES, borrowing ideas from the ‘‘Chinese kite’’, by involving
the mechanical drawing force and the electric field force. Then the samples are transferred to a
moisture-rich environment in which the ribbons absorb water vapour and become liquid lines. Surface
instability emerges and leads the liquid lines to controllable self-organization. We uncover the
controllable area to manipulate the self-organization behavior. A uniform or hierarchical microarray
with a specific position, gap and droplet-size can be generated in a continuously tunable manner. This
bottom-up method provides a digital approach for the fabrication of large-scale ordered microarrays
and micropatterns.

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