AI Article Synopsis
- The study showcases a technique using dielectrophoresis (DEP) to create a single photonic-crystal monolayer from colloidal microspheres in a microfluidic chamber.
- By applying a negative DEP force with a high-frequency AC electric field, researchers compressed microspheres to form a large, defect-free single-crystal domain, measuring around 200μm.
- The method successfully immobilizes the single-crystal domain onto a glass substrate without sacrificing its crystallinity, with the size and distribution of microspheres playing a crucial role in the assembly process.
Article Abstract
Dielectrophoresis (DEP) force-assisted assembly of a colloidal single photonic-crystal monolayer in a microfluidic chamber was demonstrated. Negative DEP force with a high-frequency AC electric field induced the compression of colloidal microspheres to form a colloidal crystal domain at the center of a hexapolar-shaped electrode. While typical assembly by monotonic DEP force forms multicrystalline domains containing crystal defects, repetitions of the DEP/relaxation cycle significantly facilitated crystal growth of 10μm monodispersed polystyrene microspheres, allowing a grain-boundary-free single-crystal monolayer domain of ca. 200μm in size. Microsphere size as well as size distribution affected the formation of the single-crystal domain. A simple method was used to immobilize the single-crystal domain on the glass substrate without losing its crystallinity.
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| http://dx.doi.org/10.1016/j.jcis.2010.11.023 | DOI Listing |
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