Advanced photochemical processes for the manufacture of nanopowders: an evaluation of long-term pilot plant operation

Abstract

Based on our long term experience with the operation of a photochemical pilot plant, we propose an UV light-based technology for syntheses of nano-dimensional metal oxides (case study for ZnO,...

First investigation of the morphological and luminescence properties of HfO2 nanoparticles synthesized by photochemical synthesis

“…40,45 Chemical yields of UV-light reaction routes can be close to 80–95%; however the precipitation yield can vary with both the concentration of the salts in solutions and the irradiation time. 45…”

“…The formation of HfO 2 solid precursors is not fully understood, and this topic deserves further investigation; however we can assume the occurrence of photoinduced reactions similar to the case of ZnO in the presence of H 2 O 2 . 40,45 Chemical yields of UV-light reaction routes can be close to 80-95%; however the precipitation yield can vary with both the concentration of the salts in solutions and the irradiation time. 45 The annealing treatment (step 4) of the samples was carried out in a vacuum furnace 0415 VAK (Clasic s. r.…”

“…40,45 Chemical yields of UV-light reaction routes can be close to 80-95%; however the precipitation yield can vary with both the concentration of the salts in solutions and the irradiation time. 45 The annealing treatment (step 4) of the samples was carried out in a vacuum furnace 0415 VAK (Clasic s. r. o.)…”

“…[39][40][41][42][43][44] The perspective of the up scaling of the method has already been shown. 45,46 The advantage of exploiting the photochemical route for the production of large amounts of NPs comes from several evidence, among which, the softening of strict control of temperature (T) and pH parameters, required in the majority of chemical methodologies. Moreover, by choosing the stoichiometry of the precursors and reaction times, the chemical product of the synthesis can be easily doped, and its size can be scaled down to the nanometer size, a peculiarity that is mandatory for the creation of scintillating nanocomposites to avoid scattering and the subsequent reduction of transparency.…”