Facile synthesis and enhanced electromagnetic microwave absorption performance for porous core-shell Fe3O4@MnO2 composite microspheres with lightweight feature

Colorimetric detection of gallic acid based on the enhanced oxidase‐like activity of floral‐like magnetic Fe3O4@MnO2

“…The phase of porous Fe 3 O 4 NPs and floral‐like magnetic Fe 3 O 4 @MnO 2 composite material were analyzed by using XRD. The XRD pattern of pure Fe 3 O 4 are shown Figure (a), including the diffraction peaks of pure Fe 3 O 4 (62.8°, 53.7°, 57.1°43.3°, 37.3°, 35.7°, 30.1°, and 18.3°) corresponding to (440), (511), (422), (400), (222), (311), (220) and (111) Bragg reflections, respectively . As shown in Figure (a), there are no extra diffraction peaks, indicating that the as‐synthesized porous Fe 3 O 4 NPs have high purity.…”

“…Floral‐like magnetic Fe 3 O 4 @MnO 2 composite material was synthesized according to previous reports with some modifications on the reaction time and the reactant ratio . Specifically, 0.3 g of the as‐prepared porous Fe 3 O 4 NPs were added to 80 mL of the 0.081 mol/L potassium permanganate (KMnO 4 ) aqueous solution, and the mixture was ultrasonicated for 15 min.…”

Facile Preparation of Snowflake‐Like MnO2@NiCo2O4 Composites for Highly Efficient Electromagnetic Wave Absorption

“…[4] Till now,v arious EMW absorption materials with different compositions and structures have been designed and prepared, such as one-dimensional (1D) mesoporous MoO 2 /C heteronanowires, [5] two-dimensional (2D) LaFeO 3 / C [6] and 2D Fe 3 C@NG/NC composites, [7] three-dimensional (3D) hierarchicalM oS 2 nanosheets/ultralongN -doped carbon nano-tubes [8] 3D SiO 2 @Fe 3 O 4 core-shell nanorod array/graphene architectures, [9] core-shell Fe 3 O 4 @MnO 2 composite microspheres, [10] hollow NiFe 2 O 4 particle/graphene hybrids, [11] etc. [4] Till now,v arious EMW absorption materials with different compositions and structures have been designed and prepared, such as one-dimensional (1D) mesoporous MoO 2 /C heteronanowires, [5] two-dimensional (2D) LaFeO 3 / C [6] and 2D Fe 3 C@NG/NC composites, [7] three-dimensional (3D) hierarchicalM oS 2 nanosheets/ultralongN -doped carbon nano-tubes [8] 3D SiO 2 @Fe 3 O 4 core-shell nanorod array/graphene architectures, [9] core-shell Fe 3 O 4 @MnO 2 composite microspheres, [10] hollow NiFe 2 O 4 particle/graphene hybrids, [11] etc.…”

“…[4] Till now,v arious EMW absorption materials with different compositions and structures have been designed and prepared, such as one-dimensional (1D) mesoporous MoO 2 /C heteronanowires, [5] two-dimensional (2D) LaFeO 3 / C [6] and 2D Fe 3 C@NG/NC composites, [7] three-dimensional (3D) hierarchicalM oS 2 nanosheets/ultralongN -doped carbon nano-tubes [8] 3D SiO 2 @Fe 3 O 4 core-shell nanorod array/graphene architectures, [9] core-shell Fe 3 O 4 @MnO 2 composite microspheres, [10] hollow NiFe 2 O 4 particle/graphene hybrids, [11] etc. [13] For instance, Qiao et al [10] demonstratedt hat Fe 3 O 4 @MnO 2 microspheres showed an excellent EMW absorption performance compared with Fe 3 O 4 or MnO 2 alone. [12] In addition, the design of core-shell structure is an availablem ethodf or improving dielectric loss, this is due to the factt hat much more chargec arriers could gathero nt he limited surfaceo f heterojunctions, which could induce interfacial polarization relaxation in ac ommutativee lectrical field.…”

Comparison of Cadmium Cd2+ and Lead Pb2+ Binding by Fe2O3@SiO2‐EDTA Nanoparticles – Binding Stability and Kinetic Studies

“…Recently, magnetic nanomaterials based on Fe 3 O 4 have found many important applications in the industrial areas such as lithium-ion batteries [20,21], catalytic sorption [22] microwave absorption [23], or photocatalytic degradation [24,25]. Multifunctional magnetic nanomaterials are also extensively used in the biomedicine [23].…”