In situ synthesis of nano-sized cobalt ferrite particle/organic hybrid

A CoFe2O4 particle/organic hybrid was synthesized using in situ processing of metalorganics of cobalt and iron below 100 °C. A mixture of cobalt (II) acetylacetonate (CA) and iron (III) 3-allylacetylacetonate (IAA) was hydrolyzed and polymerized yielding cobalt ferrite particle/organic hybrid. The crystallinity of cobalt ferrite depended upon the hydrolysis conditions of cobalt acetylacetonate-iron 3-allylacetylacetonate (CA-IAA). Nanocrystalline cobalt ferrite particles were uniformly dispersed in the organic matrix. The saturation magnetization of hybrid increased with increasing crystallinity of cobalt ferrite particles in the organic matrix. The hybrid showed a magnetization-applied field (BH) curve with no coercive force at room temperature. The magnetization versus H/T curves from 150 to 300 K were superimposed on the same curve and satisfied the Langevin equation. The hybrid revealed a saturation magnetization of 33.7 emu/g and a coercivity of 11 kOe at 4.2 K.

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In situ synthesis of lithium ferrite nanoparticle/polymer hybrid

Journal of Materials Research ◽

10.1557/jmr.2007.0113 ◽

2007 ◽

Vol 22 (4) ◽

pp. 974-981 ◽

Cited By ~ 5

Author(s):

Koichiro Hayashi ◽

Wataru Sakamoto ◽

Toshinobu Yogo

Keyword(s):

Spinel Ferrite ◽

Organic Matrix ◽

Blocking Temperature ◽

Lithium Ferrite ◽

Zero Field ◽

Organic Hybrid ◽

Ferrite Particle ◽

Ferrite Nanoparticle ◽

Hydrolysis Conditions

Lithium ferrite particle/organic hybrid was synthesized in situ from iron–organic and lithium–organic compounds below 100 °C. Spinel ferrite particle/organic hybrid was synthesized by hydrolyzing a mixture of iron (III) 3-allylacetylacetonate (IAA) and lithium acrylate (LA). X-ray diffraction analysis revealed that the crystallinity of spinel particle was dependent on the polymerization treatment and the hydrolysis conditions. The saturation magnetization of hybrid increased with increasing methylhydrazine and water amount of hydrolysis. Nanocrystalline lithium ferrite particle about 5 nm was dispersed in the organic matrix. The hybrid showed neither remanence nor coercive force at room temperature. The magnetization versus field/temperature H/T curves from 100 to 300 K were superimposed on the same curve and satisfied the Langevin equation. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curve revealed that the blocking temperature was about 75 K. The remanent magnetization and coercive field of the hybrid were 8.9 A·m2/kg and 26.3 kA/m, respectively, at 10 K.

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In situ Synthesis of Nickel Ferrite Nanoparticle/organic Hybrid

Journal of Materials Research ◽

10.1557/jmr.2005.0210 ◽

2005 ◽

Vol 20 (6) ◽

pp. 1590-1596 ◽

Cited By ~ 3

Author(s):

Satoshi Nakamura ◽

Wataru Sakamoto ◽

Toshinobu Yogo

Keyword(s):

Photoelectron Spectroscopy ◽

Nickel Ferrite ◽

Oxide Particle ◽

Organic Matrix ◽

X Ray ◽

Organic Hybrid ◽

Ferrite Particle ◽

Ferrite Nanoparticle ◽

Hydrolysis Conditions

A NiFe2O4 particle/organic hybrid was synthesized in situ from iron-organic and nickel organic compounds below 100 °C. A mixture of nickel (II) acetylacetonate (NA) and iron (III) 3-allylacetylacetonate (IAA) was hydrolyzed and polymerized yielding spinel oxide particle/oligomer hybrid. X-ray diffraction analysis revealed that the crystallinity of spinel particles was dependent upon the hydrolysis conditions of NA-IAA. Nanocrystalline nickel ferrite particles around 10 nm were uniformly dispersed in the organic matrix. The formation of nickel ferrite was confirmed by energy-dispersive x-ray and x-ray photoelectron spectroscopy. The saturation magnetization of hybrid increased with increasing water amount for hydrolysis. Nano-sized nickel ferrite particle/organic hybrid showed a BH curve with no remanence above 75 K. The magnetization versus H/T curves at 300, 200, and 75 K were superimposed on the same curve and satisfied the Langevin equation. The remanent magnetization and coercive field of the hybrid were 7.4 emu/g and 460 Oe, respectively, at 5 K.

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Synthesis of nickel zinc ferrite nanoparticle/organic hybrid from metalorganics

Journal of Materials Research ◽

10.1557/jmr.2007.0236 ◽

2007 ◽

Vol 22 (7) ◽

pp. 1967-1974 ◽

Cited By ~ 6

Author(s):

Yasuaki Hayashimto ◽

Wataru Sakamoto ◽

Toshinobu Yogo

Keyword(s):

Zinc Ferrite ◽

Oxide Particle ◽

Organic Matrix ◽

X Ray Diffraction ◽

Organic Hybrid ◽

Nickel Zinc ◽

Ferrite Particle ◽

Ferrite Nanoparticle ◽

Hydrolysis Conditions

(Ni,Zn)Fe2O4 particle/organic hybrid was synthesized in situ from metalorganics below 100 °C. A mixture of nickel (II) acetylacetonate (NA), zinc acetylacetonate (ZA), and iron (III) 3-allylacetylacetonate (IAA) was hydrolyzed and polymerized yielding a spinel oxide particle/organic hybrid. X-ray diffraction analysis revealed that the crystallinity of spinel particles was dependent upon the hydrolysis conditions of NA-ZA-IAA. Nanocrystalline nickel zinc ferrite particles below 5 nm were uniformly dispersed in the organic matrix. The magnetization of hybrid increased with an increasing amount of water for hydrolysis. Nano-sized nickel zinc ferrite particle/organic hybrid showed a magnetization-applied field (BH) curve with no remanence above 40 K. The magnetization versus H/T curves from 40 to 100 K were superimposed on the same curve and satisfied the Langevin equation. The remanent magnetization and coercive field of the hybrid were 7.2 emu/g and 150 Oe, respectively, at 4.2 K. The absorption edge of the hybrid was blue-shifted compared with that of bulk ferrite.

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In Situ Synthesis of Polyaniline Based Ceramic Wastes Composites: Dielectric and Electrical Properties

10.21203/rs.3.rs-1111541/v1 ◽

2021 ◽

Author(s):

M. Sohail ◽

Adnan Shahzad ◽

Mian Gul Sayed ◽

Ihsan Ullah ◽

M. Omer ◽

...

Keyword(s):

Composite Material ◽

High Frequency ◽

Room Temperature ◽

In Situ Synthesis ◽

Face Centered Cubic ◽

Dielectric Analysis ◽

Photovoltaic Detectors ◽

Pani Composite ◽

Face Centered

Abstract In the present study, ceramic wastes collected from the premises of industrial zone in Peshawar, KP Pakistan were investigated. An effort has been made to recycle and use the ceramic wastes as fillers in polymeric composites. The negative cost ceramic wastes were purified and activated thermally. The elemental composition and pellets of the wastes were investigated through SEM/EDX analysis. Waste/Polyaniline (PANI) composite was synthesized via in-situ free radical polymerization technique. SEM of the composites showed the uniform distribution of fillers particles in the PANI matrix. XRD studies confirmed that the prepared composite material had a face- centered cubic geometry with distinct preferential orientations. Dielectric analysis showed that the materials exhibit active performance at high frequency regions (3MHz to 3GHz) at room temperature. The results show decrease in dielectric losses and capacitance (1.6 pF) at high frequency regions. AC conductivity of the composite has been increased up to 37.95 Scm-1. This revealed the effect of PANI on the ceramic wastes while increasing its conductance performance. This suggests that the composite material can be investigated for use in photovoltaic detectors, electro-responsive capacitors and power applications.

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Synthesis of spinel iron oxide nanoparticle/organic hybrid for hyperthermia

Journal of Materials Research ◽

10.1557/jmr.2008.0417 ◽

2008 ◽

Vol 23 (12) ◽

pp. 3415-3424 ◽

Cited By ~ 18

Author(s):

Koichiro Hayashi ◽

Toshifumi Shimizu ◽

Hidefumi Asano ◽

Wataru Sakamoto ◽

Toshinobu Yogo

Keyword(s):

Magnetic Field ◽

Iron Oxide ◽

Photoelectron Spectroscopy ◽

Iron Oxide Nanoparticle ◽

Organic Hybrid ◽

Oxide Nanoparticle ◽

Hydrolysis Conditions ◽

Size Controlled ◽

Controlled Hydrolysis

Size-controlled spinel iron oxide (SIO) nanoparticle/organic hybrid was synthesized in situ from iron (III) allylacetylacetonate (IAA) at around 80 °C. The formation of SIO particles chemically bound with organics was confirmed by infrared and x-ray photoelectron spectroscopy. The sizes of SIO nanoparticles in the hybrids were monodispersed and ranged from 7 to 23 nm under controlled hydrolysis conditions. The hybrid including SIO particles of 7.3 nm was superparamagnetic, whereas those dispersed with particles above 11 nm were ferrimagnetic. The specific absorption rate (SAR) value was dependent upon the magnetic properties of the hybrid at 100 Oe. The SAR was 15.2 W g−1 in a 230 kHz alternating magnetic field and 100 Oe when the crystallite size of SIO particle in the hybrid was 16 nm. The temperatures of agars dispersed with hybrid powders of 5 and 8 mg ml−1 reached the optimum temperature (42 °C) for 17 and 8 min, respectively. The increase in temperature was controlled in terms of the strength of magnetic field. The simulation of heat transfer in the agar phantom model revealed that the suitable temperature distribution for therapy was attained from 15 to 20 min at 230 kHz and 100 Oe.

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Ultrarapid in Situ Synthesis of Cu2S Nanosheet Arrays on Copper Foam with Room-Temperature-Active Iodine Plasma for Efficient and Cost-Effective Oxygen Evolution

ACS Catalysis ◽

10.1021/acscatal.8b00032 ◽

2018 ◽

Vol 8 (5) ◽

pp. 3859-3864 ◽

Cited By ~ 55

Author(s):

Liangbo He ◽

Dan Zhou ◽

Yao Lin ◽

Ruixiang Ge ◽

Xiandeng Hou ◽

...

Keyword(s):

Oxygen Evolution ◽

Room Temperature ◽

Cost Effective ◽

In Situ Synthesis ◽

Copper Foam ◽

Nanosheet Arrays

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In situ synthesis of MnO2@SiO2–TiO2 nanofibrous membranes for room temperature degradation of formaldehyde

Composites Communications ◽

10.1016/j.coco.2019.08.002 ◽

2019 ◽

Vol 16 ◽

pp. 61-66 ◽

Cited By ~ 1

Author(s):

Fuhai Cui ◽

Weidong Han ◽

Yang Si ◽

Wenkun Chen ◽

Meng Zhang ◽

...

Keyword(s):

Room Temperature ◽

In Situ Synthesis ◽

Nanofibrous Membranes

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IN SITU SYNTHESIS, CHARACTERIZATION AND FREQUENCY DEPENDENT AC CONDUCTIVITY OF POLYANILINE/CoFe2O4 NANOCOMPOSITES

Journal of Advanced Dielectrics ◽

10.1142/s2010135x11000434 ◽

2011 ◽

Vol 01 (03) ◽

pp. 357-362 ◽

Cited By ~ 1

Author(s):

G. D. PRASANNA ◽

H. S. JAYANNA

Keyword(s):

Ac Conductivity ◽

Room Temperature ◽

In Situ Polymerization ◽

In Situ Synthesis ◽

Electron Micrograph ◽

Frequency Range ◽

X Ray Diffraction ◽

Scanning Electron Micrograph ◽

X Ray

The polyaniline (PANI)/ CoFe2O4 nanocomposites were prepared by an In Situ polymerization of aniline in an aqueous solution. The composites were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectrum,thermogravimetric analysis (TGA) and scanning electron micrograph (SEM). The AC conductivity and dielectric properties of these composites were investigated in the frequency range 1 kHz–10 MHz at room temperature. The AC conductivity was found to be constant up to 1 MHz and thereafter it increases steeply and it was observed maximum for the PANI with 60 wt% of CoFe2O4 nanocomposite. At lower frequencies the values of dielectric constant is maximum for pure CoFe2O4 nanoparticles.

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