Synthesis of magnetic microtubes decorated with nanowires and cells

Abstract

ARTICLES YOU MAY BE INTERESTED INStudy on the mechanism of a manganese-based catalyst for catalytic NO X flue gas denitration AIP Advances 8, 045004 (2018); https://doi.org/10.1063/1.4989431The effect of surface wettability on the performance of a piezoelectric membrane pump AIP Advances 8, 045010 (2018) Antiferromagnetic and ferrimagnetic microtubes decorated with nanowires have been obtained during thermal oxidation process, which was assisted by in situ electrical resistivity measurements. The synthesis route including heat treatment and electrical current along with growth mechanism are presented. This simple method and the ability to tune in the magnetic moment of the obtained microtubes going from a nonmagnetic-like to a large magnetization saturation open an avenue for interesting applications. In vitro experiments involving adherence, migration, and proliferation of fibroblasts cell culture on the surface of the microtubes indicated the absence of cytotoxicity for this material. We have also calculated both torque and driving magnetic force for these microtubes with nanowires and cells as a function of external magnetic field gradient which were found to be robust opening the possibility for magnetic bio micro-robot device fabrication and application in biotechnology.

Nanostructured Hematite Decorated with Gold Nanoparticles for Functionalization and Biocompatibility

“…The contribution of peaks at 711.2 and 709.3 eV is consistent with the coexistence of Fe 3 O 4 and Fe 2 O 3 phases because Fe 3+ /Fe 2+ ratio was 2.2 that is expected for the presence of magnetite . The result is consistent with the previous characterization of double‐layered hierarchical Fe 2 O 3 /Fe 3 O 4 microtube, which confirmed the coexistence of both magnetite (Fe 3 O 4 ) and hematite (α‐Fe 2 O 3 ) crystal phases, respectively, in studies by Pomar et al In that study, X‐ray diffraction (XRD) and the measurements of the magnetic properties of the materials corroborated that both magnetite and hematite phases coexist in the material but in different volume fractions. The hierarchical double‐layer structure with hematite as the superficial layer and magnetite as the internal layer was corroborated by Raman measurements.…”

“…The materials have been previously characterized concerning the magnetic properties, crystallinity, and hierarchically layered structure . The band gap of hematite present in the materials has values at the expected range of 2.14–2.2 eV.…”

“…The limitation for applying the Kirkendall effect for the synthesis of microhollow materials was circumvented by combining thermal oxidation with the passage of electric current that allowed the fabrication of hierarchically structured microwires and tubes of semiconductors decorated with nanostructures . Therefore, the successful fabrication of hollow materials of TiO 2 and hematite as well as SnS microtubes and ZnS hollow microspheres decorated with nanostructures was achieved. Antiferromagnetic and ferrimagnetic microtubes decorated with nanowires were fabricated by thermal oxidation combined with the passage of electrical current using iron microwires as the starting material.…”

“…Antiferromagnetic and ferrimagnetic microtubes decorated with nanowires were fabricated by thermal oxidation combined with the passage of electrical current using iron microwires as the starting material. The microtubes were incubated with cultured fibroblasts to investigate the biocompatibility of material regarding adherence, migration, and proliferation of the cells on the material surface . The highly rough surface of microtubes provided by the presence of nanowires permitted the survival and spreading on the surface of the material.…”

Designing a Multifunctional Magnetic Microtube with Enhanced Conductivity through Local Heterojunction Decoration of CsPbBr3 Nanocrystals

“…In fact, several strategies have emerged as a result of coupling different semiconducting material-forming devices with different interfaces and/or with different morphologies and sizes. − As far as this point is concerned, there is a wide range of possibility to integrate different functionalities into a single device. Important multifunctional materials are those that combine electronic, magnetic, and optical properties. − Among important constituent compounds, transition-metal chalcogenides, − transition-metal oxides, , and hybrid halide perovskites, are outstanding with high potential in photocatalysis, photodegradation, and solar cells device applications …”