Ultrasonically facilitated two‐dimensional crystallization of colloid particles

A new ultrasonic radiation technique is described which facilitates the ordering of colloid particles into regular two‐dimensional arrays. Ultrasonic radiation during the evaporation of the colloid solution enlarges the area of the particulate array and leads to a densely packed lattice reducing voids and random assemblies. Lattices of polystyrene particles (diameter: 64, 137, and 330 nm) and gold particles (diameter: 39 nm) were prepared under various ultrasonic powers. The arrays were imaged by the scanning electron microscope or the atomic force microscope.

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