Double-faced γ-Fe2O3||SiO2 nanohybrids: flame synthesis, in situ selective modification and highly interfacial activity

Abstract

Double-faced γ-Fe2O3||SiO2 nanohybrids (NHs) and their in situ selective modification on silica faces with the 3-methacryloxypropyltrimethoxysilane molecules have been successfully prepared by a simple, rapid and scalable flame aerosol route. The double-faced NHs perfectly integrate magnetic hematite hemispheres and non-magnetic silica parts into an almost intact nanoparticle as a result of phase segregation during the preparation process. The unique feature allows us to easily manipulate these particles into one-dimensional chain-like nanostructures. On the other hand, in situ selectively modified double-faced γ-Fe2O3||SiO2 NHs possess excellent interfacial activities, which can assemble into many interesting architectures, such as interfacial film, magnetic responsive capsules, novel magnetic liquid marbles and so forth. The modified NHs prefer to assemble at the interface of water-oil or oil-water systems. It is believed that the highly interfacial active NHs are not only beneficial for the development of interface reaction in a miniature reactor, but also very promising functional materials for other smart applications.

General Flame Approach to Chainlike MFe2O4 Spinel (M = Cu, Ni, Co, Zn) Nanoaggregates for Reduction of Nitroaromatic Compounds

“…Chain-like MFe 2 O 4 NAs were synthesized by a simple FSP route described in our previous work [26][27][28] and the corresponding schematic setup is shown (Supporting Information, Figure S1). In case of …”

Rapid flame synthesis of internal Mo6+ doped TiO2 nanocrystals in situ decorated with highly dispersed MoO3 clusters for lithium ion storage

“…However, because of larger ionic radium of Mo 6+ (0.068 nm) than that of Ti 4+ (0.0605 nm), 22,25 some MoO 3 species can nucleate and grow on the surface of TiO 2 particles to form heterojunctions clusters because of diffusion arrangement and phase-segregation induced growth. 30,31 Meanwhile, quasi-chain aggregates and agglomerates (i.e., chain-like fumed silica) were obtained because of the hindered growth of particles derived from rapidly cooling of flame temperature. [26][27][28][29] The phase contents of anatase and rutile in the samples are obtained from the peak intensities of anatase (101) and rutile (110), and the calculated rutile values 22.3%, 23.2%, 22.6%, 22.9% and 23.0% for flame made TiO 2 with x % Mo (x=1, 5, 10, and 15), respectively.…”

“…[26][27][28][29][30][31][32] Recently, we reported double faced γ-Fe 2 O 3 ||SiO 2 and core-shell α-Fe 2 O 3 /SnO 2 heterostructures by a simple flame process and found that both the ions doping and the interfacial, phase-segregation growth of second oxides species could be realized because of high-temperature reaction and unique temperature gradient profiles. 30 The Mo 6+ -TiO 2 /MoO 3 NHs were synthesized by a facile flame spray pyrolysis route with high temperature process, described in our previous work [30][31][32] and the corresponding schematic setup is shown Fig. 1.…”

One-step synthesis of SnOx nanocrystalline aggregates encapsulated by amorphous TiO2 as an anode in Li-ion battery

“…[28][29][30][31] Compared to liquid-phase routes, ame synthesis has advantages of being continuous, rapid, scalable and without posttreatment. [28][29][30][31] Compared to liquid-phase routes, ame synthesis has advantages of being continuous, rapid, scalable and without posttreatment.…”