Synthesis and characterization of self-assembled three-dimensional flower-like iron(iii) oxide–indium(iii) oxide binary nanocomposites

Abstract

Three-dimensional (3D) flower-like iron(III) oxide-indium(III) oxide (Fe 2 O 3 -In 2 O 3 ) binary metal oxide nanocomposites were successfully fabricated by a simple and economical route based on an efficient ethylene glycol mediated process. Effects of the experimental parameters such as the ratio of Fe to In, type of acid absorber, solvent, and reaction temperature and time on the morphology of the nanocomposite were discussed in detail. The nanocomposites Fe 2 O 3 -In 2 O 3 with flower-like morphology were readily obtained by annealing the precursor. The possible reaction mechanism leading to the precursor and the self-assembly process was also proposed. The results of the thermogravimetric analyses indicated that 3D flower-like Fe 2 O 3 -In 2 O 3 binary metal oxide nanocomposites can be used as fillers to significantly enhance the thermal resistance of silicone rubber under nitrogen.

The Role of Magnetic Nanoparticles in Cancer Nanotheranostics

“…The polyols serve as a solvent, reducing agents and stabilizers, and allow the implementation of a synthesis method without high-pressure requirements, representing an interesting process, particularly in the production of flower-shaped MNPs. This particularity is due to the reductive ability of polyols to determine the rate of structure formation and growth [30]. The polyol mixture can be composed by poly(ethylene glycol) (PEG) and diethylene glycol (DEG) or N-methyldiethanolamine (NMDEA), among others, and performed at lower pressure conditions, being the reaction conditions and the selected solvents the variables of this method that can affect the obtained NP characteristics.…”

Temperature controlled shape evolution of iron oxide nanostructures in HMTA media

“…Specically, a distinct hysteresis loop for the products obtained at 160 C was observed in the range of 0.7-1.0 P/P 0 , which belonged to the H3 type. 24,25 The red curve (nanosheets formed at 160 C) shown in Fig. 5b exhibited a relatively broad porous distribution below 20 nm.…”

“…A hysteresis loop of the H4 type was observed for the ower-like iron alkoxide product and the corresponding pore distribution shied below 6 nm indicating that the product consists of slit pores accumulated by laminar sheets with decreased spacing. 3,4,24 This phenomenon further conrms the formation of ower-like clusters assembled by aggregating nanosheets.…”

“…Based on SEM and HRTEM imaging a schematic of the proposed morphological evolution herein is presented in Scheme 1. Self-assembly, oriented attachment and Ostwald ripening were commonly employed in previous works to elucidate the formation mechanism of either ower-like or hollow spherical morphologies, which were suitable for not only iron oxide [1][2][3][7][8][9][10][11][12][13][14]24,27,[30][31][32][33] but also various kinds of metal oxide, metal alloys or non-metal SiO 2 nanostructures. 28,29,[34][35][36] These theories/ mechanisms are mostly based on the same intrinsic assumption that the crystal growth and morphological evolution tend towards a thermodynamic equilibrium regime in the reaction process.…”

Mechanism of the antioxidation effect of α-Fe2O3 on silicone rubbers at high temperature

“…Materials and sample preparation a,u-Hydroxylpolydimethylsiloxane was purchased from Dow Corning Co., Ltd. Polysilazane crosslinking agent (KH-CL) and a-Fe 2 O 3 (purity: 99.5%) powder were synthesized in our laboratory. 17,18 Dibutyltin dilaurate (purity: 97%) was purchased from Beijing InnoChem Science & Technology Co., Ltd. SR was vulcanized by 5% KH-CL with 20% SiO 2 and 5% a-Fe 2 O 3 as an additive using 0.1% dibutyltin dilaurate as the catalyst. The samples were vulcanized for 14 days at room temperature and cut down into dumbbell shapes prior to the mechanical properties test.…”