Formation of Fe and Fe₂O₃ Microspirals via Interfacial Synthesis

Abstract

A new method is reported for obtaining microspirals of iron‐based compounds by interfacial interaction. A thin film of Fe(OH)3 is obtained as a result of interaction between an aqueous solution of iron salts and gaseous ammonia. Upon drying, it is transformed into Fe(OH)3 microspirals with a diameter of up to 10 µm. These microspirals can be transformed into Fe2O3 microspirals by annealing in air. As a result of hydrogen reduction, Fe microspirals are formed. Both the annealing in air and that in hydrogen allow the retaining of the morphology. The material synthesized is characterized by electronic microscopy methods, X‐ray diffraction, diffuse reflectance Fourier transform infrared, and Mössbauer and photoelectron spectroscopies. The electrocatalytic properties of the electrode based on Fe2O3 microspirals as a catalyst of hydrogen evolution and the magnetic properties of Fe microspirals are tested. A hypothesis is proposed on the formation of microspirals by the gas–solution interface technique.

Synthesis of the FeOOH Microtubes with Inner Surface Modified by Ag Nanoparticles

“…To obtain a thin solid film on the surface of the solution, the gas–solution interface technique (GSIT) was used, which has been developed in recent years to produce microtubes with a scroll morphology of various inorganic compounds: sulfides, fluorides, and hydroxides . In particular, it was previously shown that it is possible to synthesize amorphous Fe­(OH) 3 microtubes and spirals, magnetic microscrolls Fe 3 O 4 , crystalline Fe 2 O 3 , and metallic Fe microtubes by GSIT. Among the numerous hydroxides compounds, γ-FeOOH is a typical layered material, so this modification has promising applications in catalysis, water splitting, − energy storage, , adsorption, , and wastewater treatment …”

TiO2-Decorated by Nano-γ-Fe2O3 as a Catalyst for Efficient Photocatalytic Degradation of Orange G Dye under Eco-friendly White LED Irradiation

“…In the FTIR spectrum (in red) for γ-Fe 2 O 3 Nps/TiO 2 , the absorption band (3574–3000 cm –1 ) indicates the hydroxyl group (O–H) stretching vibration mode, and the intense peak at 520 cm –1 is related to Fe–O. In addition, the absorption peaks observed at 1630 and 1517 cm –1 were a result of the symmetric and asymmetric bending vibrations of the CO bond . Also, the presence of an absorption band (625–875 cm –1 ) is related to the Ti–O and Ti–O–C vibrations …”

“…In addition, the absorption peaks observed at 1630 and 1517 cm −1 were a result of the symmetric and asymmetric bending vibrations of the C�O bond. 29 Also, the presence of an absorption band (625−875 cm −1 ) is related to the Ti−O and Ti−O−C vibrations. 17 3.1.3.…”

Young’s modulus of phyllosilicate nanoscrolls measured by the AFM and by the in-situ TEM indentation

“…A similar mechanism underlies the method of 3D micro-and nanostructures production [3], in which a strained semiconductor film is separated from the substrate using a sacrificial layer, and then scrolled to compensate the strains. Scrolled structures may also be formed from a thin, unstressed film to compensate the surface energy difference of the top and bottom sides of the film, [4]. Owing to their composition, structure and morphology, phyllosilicate nanoscrolls are considered as promising adsorbents and capsules [5][6][7], catalysts [8][9][10][11][12] and reinforcing components of composite materials [13][14][15][16].…”