Iron Oxide Doped Alumina‐Zirconia Nanoparticle Synthesis by Liquid Flame Spray from Metal Organic Precursors

Abstract

The liquid flame spray (LFS) method was used to make iron oxide doped alumina-zirconia nanoparticles. Nanoparticles were generated using a turbulent, high-temperature (T max ∼3000 K) H 2 -O 2 flame. The precursors were aluminium-isopropoxide, zirconium-n-propoxide, and ferrocene in xylene solution. The solution was atomized into micron-sized droplets by high velocity H 2 flow and introduced into the flame where nanoparticles were formed. The particle morphology, size, phase, and chemical composition were determined by TEM, XRD, XPS, and N 2 -adsorption measurements. The collected particulate material consists of micron-sized aggregates with nanosized primary particles. In both doped and undoped samples, tetragonal phase of zirconia was detected in room temperature while alumina was found to be noncrystalline. In the doped powder, Fe was oxidized to Fe 2 O 3 . The primary particle size of collected sample was approximately from 6 nm to 40 nm. Doping was observed to increase the specific surface area of the powder from 39 m 2 /g to 47 m 2 /g.

ToF-SIMS Analysis of UV-Switchable TiO2-Nanoparticle-Coated Paper Surface

“…UVA treatment of the nanocoated aluminum foil did induce superhydrophilicity (CA ≈ 6°), but subsequent oven treatment did not lead to superhydrophobicity, which was the case for the paper sample. Various substrates such as glass, ceramic, and metal surfaces have been coated with TiO 2 nanoparticles by LFS deposition 7,12,13,42 albeit only the TiO 2 nanocoatings on paper-based substrates have shown to yield superhydrophobicity. 8,9,24,34−37 Furthermore, TiO 2 -nanocoated paper-based substrates clearly differ from pure TiO 2 films that exhibit hydrophilic character.…”

“…Different types of nanoparticles have been applied to form surfaces with versatile wetting properties, such as the ability to be transformed from hydrophobic to hydrophilic, and vice versa. , The importance of such surface arises because wettability has an effect on material performance − in, for example, printing. In this work, a superhydrophobic paper surface was created by deposition of TiO 2 nanoparticles on coated paper using a liquid flame spray (LFS) process. , This roll-to-roll process, which is performed at high speeds, is a promising technology for producing new paper-based products with innovative functionalities. , The LFS process can also be used to create a broad spectrum of inorganic oxide nanoparticles, including Al 2 O 3 , ZrO 2 , Mn 2 O 3 , and Fe 2 O 3 . ,− …”

Synthesis of carbon nanotubes on FexOy doped Al2O3–ZrO2 nanopowder

“…The critical crystal size for phase transition from tetragonal to monoclinic is 8-18 nm. Below above-mentioned range tetragonal phase is thermodynamically stable [30]. Tetragonal structure could, in certain circumstances, occur although the crystal size is bigger than 18 nm.…”

Liquid Flame Spray—A Hydrogen-Oxygen Flame Based Method for Nanoparticle Synthesis and Functional Nanocoatings

“…single component (Tikkanen et al, 1997;Mäkelä et al, 2004), binary component Keskinen et al, 2005) and multicomponent nanopowders (Nikkanen et al, 2008;Nikkanen et al,. 2014).…”