Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition

• Mykhailo Nahorniak,
• Pamela Pasetto,
• Jean-Marc Greneche,
• Volodymyr Samaryk,
• Sandy Auguste,
• Anthony Rousseau,
• Nataliya Nosova and
• Serhii Varvarenko

Beilstein J. Nanotechnol. 2023, 14, 11–22, doi:10.3762/bjnano.14.2

• single reactor using Fe(III) acetylacetonate as the initial precursor for the synthesis of Fe(III) oleate or Fe(III) undecylate followed by their thermolysis in situ. We proposed a new approach, according to which the essential magnetite precursor (a complex salt of higher acids – Fe(III) alkanoates) is

• obtained in a solvent with a high boiling point via displacement reaction of acetylacetone with a higher acid from Fe(III) acetylacetonate during its elimination from the reaction mixture under vacuum conditions. Magnetic nanoparticles (NPM) were characterized in terms of morphology, hydrodynamic diameter

• undecylenic (UA) acids, which are both used as a reagent and as a nanoparticle stabilizer, as well as the influence of their ratio to Fe(III) acetylacetonate on the properties of particles were investigated. Stable dispersions of NPM were obtained in 1-octadecene within the OA or UA ratio from 3.3 mol to 1

High photocatalytic activity of Fe₂O₃/TiO₂ nanocomposites prepared by photodeposition for degradation of 2,4-dichlorophenoxyacetic acid

• Shu Chin Lee,
• Hendrik O. Lintang and
• Leny Yuliati

Beilstein J. Nanotechnol. 2017, 8, 915–926, doi:10.3762/bjnano.8.93

• activity. The formation of Fe2O3 was in good agreement with other reported photodeposition methods when using a different iron precursor, Fe(III) nitrate nonahydrate [15]. Due to the oxidative condition during the synthesis process, the Fe(III) acetylacetonate precursor could be decomposed to Fe2O3 such as

• by the photogenerated oxygen radicals [21]. It was demonstrated that the use of the Fe(III) acetylacetonate precursor led to a complete photodeposition to form Fe2O3, as also supported by ICP-OES results discussed above. The improved charge transfer of the Fe2O3(0.5)/TiO2 (PD) sample was further

• –101%, Merck), benzoquinone (99%, Acros Organics), and tert-butanol (99.0%, Merck). Sample preparation The TiO2 material used in this study was from the commercial supplier Hombikat, UV100 TiO2. The Fe2O3 used as a control was prepared by direct calcination of Fe(III) acetylacetonate under air