Tetragonal zirconia spheres fabricated by carbon-assisted selective laser heating in a liquid medium

Abstract

Submicrometer-sized tetragonal zirconia spheres are synthesized by carbon-assisted selective pulsed laser heating in a liquid medium at room temperature. Sphere formation and phase transformation from the monoclinic to the tetragonal phase are only observed by laser irradiation of a colloidal solution containing raw zirconia mechanically milled with nanocarbon. This result indicates that nanocarbon, having close contact with zirconia particles, plays a very important role in forming submicrometer-sized tetragonal zirconia spheres.

Structural, Morphological and Optical Properties of Nanoproducts of Zirconium Under Laser Ablation in Water and in Aqueous SDS Solutions

“…Average size of particles for both parts of dioxide and metal zirconium reduces to 40-45 nm. The reduction of crystallite average sizes at M = 0.01 and 0.05 with regards to crystallite sizes at M = 0 is caused by the influence of surfactant -SDS, which restricts nanoparticles growth [28,29]. The presence of SDS in the initial solution creates prerequisites for the appearance of the third high temperature phase of zirconia, i.e.…”

A physicochemical process for fabricating submicrometer hollow fluorescent spheres of Tb3+-incorporated calcium phosphate

“…This result indicates that the irregularly shaped agglomerates of the carbon-integrated HAp nanopowders (Fig. 17,18 Using transmission electron microscopy (TEM), single-hollow structures (type A) and multihollow structures (type B) were observed within the spheres in CaP-2 (Fig. 1d) under laser irradiation.…”

“…The authors explained that due to the rapid heating and quenching during pulsed laser irradiation, the gases produced in the nanopowders (agglomerates of carbonintegrated metal oxide nanopowders 17,18 or raw metal and semiconductor nanopowders 16 ) are sometimes not released before nal solidication. Â: process not applied.…”

Structural, Morphological and Optical Properties of Nanoproducts of Zirconium Target Laser Ablation in Water and Aqueous SDS Solutions

“…There are certain zones in the focal spot on the target surface due to space and time power distribution over beam area: ablation ( ≥ 10 8 W/cm 2 ), melting (< 10 8 W/cm 2 ), surface heating above liquid boiling point [40]. The ablation produces a plasma-vapor-gas bubble; its collapse may create secondary gas (H 2 , O 2 ) and vapor bubbles [40][41][42][43][44]. The process generates both heated solid particles and metal droplets with a vapor cloud around them [45].…”