Electrospun barium titanate/cobalt ferrite composite fibers with improved magnetoelectric performance

RSC Advances ◽  
2014 ◽  
Vol 4 (98) ◽  
pp. 55217-55223 ◽  
Author(s):  
Avinash Baji ◽  
Yiu-Wing Mai ◽  
Rattikorn Yimnirun ◽  
Sujitra Unruan
Keyword(s):  
Barium Titanate ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Composite Fibers ◽  
Electrospinning Technique ◽  
Magnetoelectric Response

In this study, we use a versatile sol–gel based electrospinning technique to fabricate nanostructured barium titanate (BaTiO3)/cobalt ferrite (CoFe2O4) composite fibers and analyze their magnetoelectric response.

scholarly journals One-Step Synthesis of Hollow Titanate (Sr/Ba) Ceramic Fibers for Detoxification of Nerve Agents

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Satya R. Agarwal ◽  
Subramanian Sundarrajan ◽  
Arunachalam Venkatesan ◽  
Seeram Ramakrishna
Keyword(s):  
Electron Microscope ◽  
Surface Area ◽  
Sol Gel ◽  
Analytical Techniques ◽  
Titanium Isopropoxide ◽  
Hollow Fibers ◽  
Vinyl Pyrrolidone ◽  
Composite Fibers ◽  
Electrospinning Technique ◽  
Bet Analysis

Poly(vinyl pyrrolidone)(PVP)/(strontium/barium acetate)/titanium isopropoxide composite fibers were prepared by electrospinning technique via sol-gel process. Diameters of fibers prepared by calcinations of PVP composite fibers were 80–140 nm (solid) and 1.2-2.2 μm (hollow fibers prepared by core-shell method). These fibers were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD), and transmission electron microscope (TEM) analytical techniques. XRD results showed better crystalline nature of the materials when calcined at higher temperatures. SEM and TEM results clearly showed the formation of hollow submicrometer tubes. The surface area of the samples determined by BET analysis indicated that hollow fibers have ~20% higher surface area than solid fibers. The UV studies indicate better detoxification properties of the hollow fibers compared to solid fibers.

Synthesis and Characterization of BaTiO3/CoFe2O4 thin films

2011 ◽  
Vol 1368 ◽  
Author(s):  
Helen R. C. S. Andrade ◽  
Luciana M. Seara ◽  
Nelcy D. S. Mohallem
Keyword(s):  
Thin Films ◽  
Barium Titanate ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Dip Coating ◽  
Ferroelectric Materials ◽  
Nanocomposite Films ◽  
Ferrite Film ◽  
Vis Spectroscopy ◽  
Quartz Substrates

ABSTRACTNanocomposites formed by ferrimagnetic and ferroelectric materials are multiferroic material in which magnetoelectric coupling occurs via piezoelectricity and magnetostriction phenomena. These nanocomposites have a variety of applications in tunable microwave devices using electric control of spin wave propagation or new magnetic memories in which the magnetic response is controlled by electric field.In this work, transparent and homogeneous thin films of barium titanate interleaved with cobalt ferrite were prepared by sol–gel method using dip-coating process. Films of pure barium titanate and cobalt ferrite were also prepared for comparison. The nanocomposite films were deposited onto clean quartz substrates, where a coating of each material was deposited interleaved, where the cobalt ferrite film formed the last layer. The films were dried in air after each dipping and heated at 900 oC for 1 hour to convert the amorphous films into crystalline ones. The samples were characterized by low angle X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) and UV-Vis spectroscopy.

Synthesis of Sn4+ Doped TiO2 Nanotube and its Photocatalytic Activity

2012 ◽  
Vol 724 ◽  
pp. 21-24
Author(s):  
Hong Ying Dong ◽  
Yan Ping Ren ◽  
Kai Ming Huang ◽  
Wei Yan He ◽  
Wen Ma
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Stable Phase ◽  
Visible Light Region ◽  
Composite Fibers ◽  
Small Particles ◽  
Electrospinning Technique ◽  
Photodegradation Efficiency ◽  
Light Region

The PVP+Ti (OC4H9)4+SnCl4·5H2O/sesame oil composite fibers were successfully prepared by a sol-gel method combined with a coaxial electrospinning technique. The Sn4+/TiO2 nanotubes were obtained by calcining the above-mentioned composite fibers and characterized by XRD and TEM. XRD results show that increasing reaction temperature facilitates to form a stable phase. TEM results show that the Sn4+/TiO2 nanotubes have smooth surface with wall thickness of ~120 nm and are composed of small particles of ~5 nm. The photocatalytic activity of Sn4+/TiO2 nanotubes was investigated. The photodegradation efficiency of Sn4+/TiO2 nanotubes decreases in UV region but increases in visible light region. The photocatalytic properties of three 0.52at% Sn4+/TiO2 nanomaterials with different morphologies were also evaluated. The photodegradation efficiencies of Sn4+/TiO2 nanopowers, Sn4+/TiO2 nanofibers and Sn4+/TiO2 nanotubes increase in visible light region in sequence. In summary, chemical modification by doping Sn4+ and morphology changing for TiO2 can improve its photocatalytic activity in visible light region significantly.

Structural and Magnetic Properties of Cobal Ferrite - Barium Titanate Nanotube Arrays

2011 ◽  
Vol 1368 ◽  
Author(s):  
Dario Bueno-Baques ◽  
Veronica Corral-Flores ◽  
Norma A. Morales-Carrillo ◽  
Alejandro Torres ◽  
Hector Camacho-Montes ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Barium Titanate ◽  
Composite Structures ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Nanotube Arrays ◽  
Ferromagnetic Behavior ◽  
Titanate Nanotube ◽  
Average Grain Size ◽  
Composite Nanotubes

ABSTRACTCobalt Ferrite/Barium Titanate nanotube arrays were obtained in anodic aluminum oxide templates (AAO) of 100 nm pore diameter by a two step sol-gel process. Each phase was grown in several wetting – drying cycles starting from the cobalt ferrite layers with the barium titanate on top. As-dried composite structures were sintered at 700 C. The composite nanotubes showed a fine polycrystalline microstructure with an average grain size of 5 nm. The formation of both spinel and perovskite structures was verified by High Resolution Transmission Electron Microscopy (HR-TEM) on isolated nanotubes. The growing rate by layer was found to be lower for the BaTiO3 on top of CoFe2O4 than the later on top of the AAO. Wall sizes were estimated by Z-contrast as 9.8 nm for one layer of CoFe2O4 and 6.6 nm for six layers of BaTiO3. Magnetic properties were studied by VSM. Samples showed ferromagnetic behavior with low coercive values. By means of a finite element model the deformation and stress on the piezoelectric phase was estimated and used to simulate the magnetization reversal under stress in the composite nanotubes, using an updated micromagnetic framework to include the magnetostriction effect. Simulation results showed that a curling mode is expected with opposite vortex states at the end of the nanotubes. The change in the vortex domain structure under voltage driven applied stress is presented and discussed.

scholarly journals Photocrosslinking and photopatterning of magneto-optical nanocomposite sol–gel thin film under deep-UV irradiation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
C. Bidaud ◽  
D. Berling ◽  
D. Jamon ◽  
E. Gamet ◽  
S. Neveu ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Optical Devices ◽  
High Concentration ◽  
Nanocomposite Thin Films ◽  
Deep Uv ◽  
High Concentrations ◽  
193 Nm ◽  
The Impact

AbstractThis paper is aimed at investigating the process of photocrosslinking under Deep-UV irradiation of nanocomposite thin films doped with cobalt ferrite magnetic nanoparticles (MNPs). This material is composed of a hybrid sol–gel matrix in which MNP can be introduced with high concentrations up to 20 vol%. Deep-UV (193 nm) is not only interesting for high-resolution patterning but we also show an efficient photopolymerization pathway even in the presence of high concentration of MNPs. In this study, we demonstrate that the photocrosslinking is based on the free radical polymerization of the methacrylate functions of the hybrid precursor. This process is initiated by Titanium-oxo clusters. The impact of the nanoparticles on the photopolymerization kinetic and photopatterning is investigated. We finally show that the photosensitive nanocomposite is suitable to obtain micropatterns with sub-micron resolution, with a simple and versatile process, which opens many opportunities for fabrication of miniaturized magneto-optical devices for photonic applications.

Magnetic and magnetoelectric response of Gd doped nickel ferrite and barium titanate nanocomposites

2020 ◽  
Vol 127 (11) ◽  
pp. 114104 ◽  
Author(s):  
Tripta Parida ◽  
Amritesh Kumar ◽  
B. S. Murty ◽  
G. Markandeyulu
Keyword(s):  
Barium Titanate ◽  
Nickel Ferrite ◽  
Magnetoelectric Response

Barium titanate sols prepared by a diol-based sol–gel route

2005 ◽  
Vol 351 (12-13) ◽  
pp. 976-980 ◽  
Author(s):  
Supin Tangwiwat ◽  
Steven J. Milne
Keyword(s):  
Barium Titanate ◽  
Sol Gel
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