scholarly journals Self-standing magnetic composite nanosheets prepared in the presence of an external magnetic field: Characterization and potential for medical applications

2020 ◽  
pp. 174751982095860
Author(s):  
Mina Sakuragi ◽  
Yoshikazu Takahashi ◽  
Keito Ehara ◽  
Katsuki Kusakabe
Keyword(s):  
Magnetic Field ◽  
Thermal Decomposition ◽  
External Magnetic Field ◽  
Decomposition Method ◽  
Sol Gel ◽  
Magnetic Composite ◽  
Magnetic Response ◽  
Gel Method ◽  
Sol Gel Method ◽  
Thermal Decomposition Method

The aim of this study is to develop self-standing, ultrathin film, nanosheets with high magnetic response for use in a medical device that can be migrated to a target location in the body by using an external magnetic field. First, iron oxide nanoparticles are synthesized by either the sol-gel method or thermal decomposition. The resulting magnetic properties of the nanoparticles show that the thermal decomposition method provides a greater saturation magnetization value than the sol-gel method. Next, the nanoparticles obtained by the thermal decomposition method are embedded into nanosheets of poly(L-lactide) at varying concentrations. Embedding of the nanoparticles in the composite nanosheets is achieved by the application of an external magnetic field. The composite nanosheets are then characterized. The thickness of the nanosheet increases, and the nanoparticles are well dispersed, with an increase in poly (L-lactide) concentration. The NP-embedded nanosheets are imaged by transmission electron microscopy, which reveals thin, long aggregates aligned in collinear line features. X-ray diffraction results indicate that the magnetic hard axis of the nanoparticles in the nanosheets is aligned in parallel to the plane of the nanosheet by magnetic field application during nanosheet preparation. In addition, the nanosheets at high poly (L-lactide) concentrations that had been subjected to a magnetic field during preparation show a slightly greater magnetic response compared with both nanosheets without magnetic field exposure and nanosheets prepared at low poly (L-lactide) concentrations.

Graphene/nickel aerogel: an effective catalyst for the thermal decomposition of ammonium perchlorate

RSC Advances ◽  
2016 ◽  
Vol 6 (85) ◽  
pp. 82112-82117 ◽  
Author(s):  
Yuanfei Lan ◽  
Bixin Jin ◽  
Jingke Deng ◽  
Yunjun Luo
Keyword(s):  
Thermal Decomposition ◽  
Ammonium Perchlorate ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Gel Method ◽  
Sol Gel Method ◽  
Effective Catalyst

G/Ni aerogels were prepared by a sol–gel method and supercritical CO2 drying. They exhibit a remarkable catalytic performance for the thermal decomposition of AP.

Heat generation ability in AC magnetic field of MgAlxFe2-xO4 ferrite powder prepared by sol-gel method

2016 ◽  
Author(s):  
Hideyuki Hirazawa ◽  
Yoshiki Ito ◽  
Deleg Sangaa ◽  
Namsrai Tsogbadrakh ◽  
Hiromichi Aono ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Generation ◽  
Sol Gel ◽  
Ferrite Powder ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ac Magnetic Field

scholarly journals Degradation of Semiconductor Manufacturing Wastewater by Using a Novel Magnetic Composite TiO2/Fe3O4Photoreactor Design

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Chen-Yu Chang ◽  
Yung-Hsu Hsieh
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Semiconductor Manufacturing ◽  
Sol Gel ◽  
Fluorescent Light ◽  
Magnetic Composite ◽  
Ultraviolet A ◽  
Gel Method ◽  
Sol Gel Method

The purpose of this research is to develop a photocatalytic TiO2that can be activated by visible light and can be conveniently recollected for reusing. This research synthesizes the 20 to 40 nm TiO2/Fe3O4particles with magnetization of 5.8 emu/g using the modified sol-gel method followed by 500°C calcinations. The experiment verified that visible fluorescent light (VFL, contains no UV-A) could activate the photocatalytic activity of TiO2/Fe3O4particles as did ultraviolet A light (UV-A, 360 nm). Regular magnets can be used to separate TiO2/Fe3O4particles from solution. The results indicate that VFL-sirradiated TiO2/Fe3O4particles could decompose isopropanol (IPA) in the absence of UV-A and the issue of TiO2/Fe3O4recollection from water for reusing is also resolved.

scholarly journals Effect of magnetic field on the synthesis of well-aligned TiO2-5CB by sol-gel method

2017 ◽  
Vol 13 (4) ◽  
pp. 690-692
Author(s):  
Nur Izzati Abu Bakar ◽  
Sheela Chandren ◽  
Nursyafreena Attan ◽  
Leaw Wai Loon ◽  
Hadi Nur
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Sol Gel ◽  
Potential Method ◽  
Ambient Condition ◽  
Drying Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
5Cb Liquid Crystal ◽  
The Magnetic Field

This paper describes the approach by using a magnetic field as a technique in order to synthesize well-aligned materials. The magnetic field technique could be a potential method because it has advantage that all of the materials could be aligned by magnetic field as long as they have magnetic anisotropy. The aim of this research is to explore the effects of magnetic field and magnetic line in the synthesis of well-aligned material, namely titania (TiO2).  The synthesis of well-aligned titania with liquid crystal as the structure-aligning agent is demonstrated under magnetic field in the presence of liquid crystal, 4′-pentyl-4-biphenylcarbonitrile (5CB), tetra-n-butyl orthotitanate (TBOT), 2-propanol and water. The mixture underwent slow hydrolysis and drying process under magnetic field (0.3 T) in ambient condition. The use of magnetic field and 5CB liquid crystal as the structure aligning agent has led to the successful formation of well-aligned TiO2-5CB via sol-gel method. When no magnetic field was applied, the TiO2-5CB obtained was spherical in shape and no alignment can be observed. This study demonstrated that magnetic field can play an important role in the synthesis of well-aligned TiO2-5CB.

scholarly journals Synthesis and catalytic activity of Cu–Cr–O–TiO2 composites for the thermal decomposition of ammonium per-chlorate: enhanced decomposition rate of fuel for solid rocket motors

RSC Advances ◽  
2017 ◽  
Vol 7 (21) ◽  
pp. 12486-12495 ◽  
Author(s):  
Harish Kumar ◽  
Prahalad N. Tengli ◽  
Vijay Kumar Mishra ◽  
Pankaj Tripathi ◽  
Dan Bahadur Pal ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Decomposition Rate ◽  
Sol Gel ◽  
Solid Rocket Motors ◽  
Rocket Motors ◽  
Gel Method ◽  
Sol Gel Method ◽  
Solid Rocket ◽  
Catalytic Effects

This study presents the synthesis of Cu–Cr–O·nTiO2 particles via sol–gel method and their catalytic effects on thermal decomposition of AP.

scholarly journals Structure and Thermal Decomposition of KxMnO2・yH2O Prepared by Sol-Gel Method

2009 ◽  
Vol 34 (3) ◽  
pp. 447-450 ◽  
Author(s):  
K. Fujiwara ◽  
K. Akedo ◽  
Y. Tasaki ◽  
A. Nakatsuka ◽  
N. Nakayama
Keyword(s):  
Thermal Decomposition ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

Preparation of Barium Titanate Grain-Oriented Ceramics by Electrophoresis Deposition Method under High Magnetic Field Using Single-Domain Nanoparticles

2013 ◽  
Vol 582 ◽  
pp. 27-31 ◽  
Author(s):  
Satoshi Wada ◽  
Tatsuya Kita ◽  
Ichiro Fujii ◽  
Kouichi Nakashima ◽  
Takahiro Takei ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thermal Decomposition ◽  
Barium Titanate ◽  
High Magnetic Field ◽  
Decomposition Method ◽  
Single Domain ◽  
Deposition Method ◽  
Thermal Decomposition Method ◽  
Electrophoresis Deposition ◽  
Binder Burnout

Barium titanate (BaTiO3, BT) grain-oriented ceramics were prepared by electrophoresis deposition (EPD) method under high magnetic field (HM-EPD) of 12 T. For this objective, the BT single-domain nanoparticles with highc/aratio of 1.008 and size of 103 nm were prepared by two-step thermal decomposition method. Using the BT nanoparticle slurry, BT nanoparticle accumulations were prepared by EPD or slipcasting (SC) methods with/without high magnetic field. After binder burnout, these accumulations were sintered at 1350 °C and it was revealed that only the BT ceramics prepared by the HM-EPD method was assigned to grain-oriented ceramics with weak preferential crystallographic orientation along [11 direction.

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