Composite particles of nanoblue pigmentpoly(styrene-co-n-butyl acrylate-co-methacrylic acid) of controllable size were successfully prepared using high-speed homogenization-assisted suspension polymerization. This composite has potential application as a toner for highresolution printing. A nanosized hybrid blue pigment, with a monodispersed and uniform spherical shape, was employed for the production of composite particles. The effects of agitation speed, pigment concentration, and anionic surfactant concentration on the properties of the prepared composite particles were investigated. Agitation speed plays an important role in controlling particle size. The prepared composite particles have geometric mean diameters in the range of 4.4-7.4 lm with the geometric standard deviation ranging from 1.23 to 1.33. High-speed homogenization during droplet formation is useful for a reduction in the size of the prepared composite particles. In addition, the appropriate surfactant concentration has a significant effect on the particles' morphology. However, the concentration of the nanopigment did not significantly change either particle morphology or particle size.
A high-performance, GaN-based light emitting diode (LED) was prepared using a metal organic chemical vapor deposition method on a silica-sphere, monolayer-coated sapphire substrate. Various surface coverage ratios of the silica submicron spheres with diameters ranging from 300to550nm were deposited on the sapphire substrate using a spin-coating method. The LED output power was increased 2.5-fold compared with the LED constructed without silica spheres and uniform light distribution was achieved. In addition, LED output power was dependent on silica-sphere size and surface coverage of the substrates.
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