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Linear colloidal crystal arrays by electrohydrodynamic printing
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) The schematic diagram of EHDP apparatus for the deployment of a suspension jet. The nozzle is grounded and a negative high voltage is applied between nozzle and the disk. (b) Almost perfect crystalline linear arrays of PS latex ( diameter) produced by EHDP on a silicate glass substrate. Patterns were imaged with a CCD camera mounted on a Leitz Metallovert optical microscope. The bottom image depicts a typical section of a one-dimensional colloidal crystal. A and B indicate the positions of a point defect and the presence of an additional particle on top of the array, respectively. The inset ( wide) shows the overall appearance of the colloidal line pattern. The top image illustrates a continuous two-particle-wide array with three-particle defect.

Image of FIG. 2.
FIG. 2.

(a) Schematic illustration of the colloidal crystal formation during the drying process of a deployed suspension line. Two stripes of colloidal aggregates form at the edges of the lines due to evaporative convective flow. Below a critical linewidth of deployed pattern, two stripes of aggregates merge to yield a single stripe of colloidal crystal as (b) the capillary force exceeds the frictional force .

Image of FIG. 3.
FIG. 3.

(a) The schematic of a colloidal dispersion line on a glass substrate with variable widths drawn from a colloidal drop of 3 mm diameter (drop not to scale) with a metal wire. [(b) and (c)] Optical microscope images of dried colloidal lines showing the transition from a double-stripe pattern to a single stripe as the initial width of deployed suspension line decreases from 200 to . and are the critical initial width for the transition and the corresponding nearest separation distance between two clusters. The initial contact line position is indicated by the dark stains formed from the deposition of solute upon evaporation. Panel (c) shows a dried solid line formed at small linewidths.


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Scitation: Linear colloidal crystal arrays by electrohydrodynamic printing