Formation of polymer nanoparticles by UV pulsed laser ablation of poly (bisphenol A carbonate) in liquid environment

Abstract

Suspensions of poly(bisphenol A carbonate) (PBAC) nanoparticles of varying size and shape have been produced by ablation of a PBAC target in liquid media with the fourth harmonic of a Q-switched Nd:YAG laser (wavelength 266 nm, full width at half maximum 4 ns, repetition rate 10 Hz). The polymer target was placed at the bottom of a rotating glass vessel filled with around a 10 mm column of liquid. Laser ablation in water leads to spherical nanoparticles with diameters of several tens of nanometers for fluences close to 1 J/cm 2 . Ablation at lower fluences, around 0.1 J/cm 2 , results in the production of nanoparticles of smaller diameters and also of non-spherical nanoparticles. Additional irradiations at the fluence of 0.1 J/cm 2 were performed in several liquid media with different properties, in terms of density, viscosity, thermal conductivity, boiling temperature, isothermal compressibility and polarity. The different size distributions observed were related to the thermal conductivity of the systems, while their viscosity seems to be responsible for the development of nanostructures with different morphologies.

Matrix–particle interactions in catalyzed and uncatalyzed copper‐filled epoxy matrix composites

“…The peaks at the lowest binding energy, at 283.9 eV and 284.2 eV in the uncatalyzed and catalyzed samples, respectively, are attributed to the C (1 s) core level of the aromatic ring, while the peak at 284.5 eV is attributed to CH bonds and elemental carbon . The peaks at 285.3 eV and 285.5 eV are attributed to CO, aliphatic CH, and CC, and those at 287.9 eV and 288.0 eV are attributed to carbon in a metal carboxylate with some influence of OCO bonds . The main difference observed between both composites would be the increase in the last peak mentioned from the catalyzed to the uncatalyzed sample.…”

Synthesis of surfactant free stable nanofluids based on barium hexaferrite by pulsed laser ablation in liquid

“…15 The higher opposing force caused by higher viscosity of the solvent results in difference in the expansion dynamics of the plume which in turn exert inuence on the homogeneity of the plume. 29 Nanoparticle characteristics are affected by target material properties also. Thermal conductivity of materials determines the time period during which the particles are in molten form.…”

PL Tunable GaN Nanoparticles Synthesis through Femtosecond Pulsed Laser Ablation in Different Environments

“…of water, which render the growth rate of particles relatively slow and the growth time short [21]. Thus the size of GaN-NPs@water (2.7 nm) is smaller than that in GaN-NPs@air (3.2 nm).…”

“…In the air, before being quenched by sputtering into water, the growth rate of GaN-NPs on GaN-air interface is fast due to the less confinement of air on the laser-induced plasma, which results in larger NPs. However, in water, the confinement on the laser-induced plasma is more intense due to the relatively large viscosity of water and the cooling time is short due to the large thermal conductivity of water, which render the growth rate of particles relatively slow and the growth time short [21]. Thus the size of GaN-NPs@water (2.7 nm) is smaller than that in GaN-NPs@air (3.2 nm).…”