Conducting Polypyrrole Shell as a Promising Covering for Magnetic Nanoparticles

Nan, Alexandrina; Crăciunescu, I.; Turcu, Rodica

doi:10.5772/29454

Cited by 5 publications

(4 citation statements)

References 69 publications

(53 reference statements)

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“…Morphology and crystallisation of nanocomposite are sensitive to the following: (1) the nucleation of the dopant into the ferrite, (2) growth kinetics of the nanocomposites, (3) high [70][71][72] optical absorption coefficients to cater to electromagnetic interaction,(4) low binding energies of photo-excited electron-hole pairs 71,73 to make the conduction easier and (5) long and balanced electron-hole diffusion lengths [74][75][76][77] to facilitate the effective mobility during the hopping mechanism. All these parameters are strongly dependent on the energy barrier of the reaction both at the formation level of doped nanoferrites as well as the proper formation of the nanocomposite.…”

Section: Methodsmentioning

confidence: 99%

Studies on conducting nanocomposite with gallium nitride–doped ferrite, part-II

Indrakanti

Rao²,

Kiran³

2017

Proceedings of the Institution of Mechanical Engineers, Part N:

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This article (a sequel to part-I that appeared earlier in the same journal) presents synthesis and characterisation details of conducting PPY-nanocomposite obtained from gallium nitride-doped ferrite and polypyrrole. The GaN-doped ferrite is synthesised by sol-gel method. GaNFe 2 O 3f -PPY composites are prepared by impregnation technique. Using the SciFinder software we could not trace any report in the literature for this synthesised Ga (2x + 2) NFe 2(49 2 x) O 3 -PPY nanocomposites. The doped nanoferrite is combined with polypyrrole, an intrinsic conducting polymer, in three proportions by percentage (70%:30%), (90%:10%) and (97%:3%), to obtain two series each of three compositions for the conducting PPY-nanocomposite. The synthesised polymer composites are characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray analysis and Fourier transform infrared spectroscopy. From our studies, it has been observed that the crystallite size of nanocomposites is decreased when compared to crystallite size of GaNFe 2 O 3 . The average particle size from histogram is in good agreement with Debye-Scherrer formula calculations. The scanning electron microscopy and transmission electron microscopy micrograms reveal that the particles are varying with the values of X and the percentage of PPY. The shapes observed are Globules,Tetrahedron,Nanorods of short and long lengths. The GaNFe 2 O 3 -PPY composites' spectra revealed the shift in the band in comparison with the PPY spectra. Also, the wavelength is decreased, and vibrational frequency is increased.

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Section: Methodsmentioning

confidence: 99%

Studies on conducting nanocomposite with gallium nitride–doped ferrite, part-II

Indrakanti

Rao²,

Kiran³

2017

Proceedings of the Institution of Mechanical Engineers, Part N:

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“…Polymeric materials are well known because of their versatile surface property, aqueous stability, and biocompatibility. Conducting polymers such as polypyrrole (Ppy) are promising electrochemical probes for biosensors as they possess inherent electrical conductivity that can be exploited for amperometric detection [15][16][17][18][19][20]. Thus far, though electrochemical biosensors provide high sensitivity in terms of an electrical signal, it still has some obstacles including lack of surface structures and integrating electrical devices with biological systems to convert biological changes into electrical signals [21,22].…”

Section: Introductionmentioning

confidence: 99%

Development of nano-immunosensor with magnetic separation and electrical detection of Escherichia coli using antibody conjugated Fe₃O₄@Ppy

Srinivasan

Gajbhiye²,

Bodas³

2020

Nanotechnology

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Detection of bacterial pathogens is the need of the hour due to the increase in antibiotic resistance and the infusion of multi-drug-resistant parasites. The conventional strategies such as ELISA, PCR, and MNP based tests for the detection are efficient but they are cost, time, lab, and manpower intensive. Thus, warranting a simple and effective technique for rapid detection of bacterial pathogens. Magnetic nanoparticles (NPs) have proved to be better alternatives for separation of bacterial pathogens from a variety of sample sources. However, the use of magnetic NPs has not been successful in the detection of these parasites. The current work involves the coating of magnetic NPs (Fe3O4) with a conducting polymer (polypyrrole; Ppy) to facilitate simultaneous separation and detection. Electrical (conductivity) measurement was the mode of choice due to the sensitivity, accuracy, and ease it offers. To enhance the conductivity, carboxylic groups were expressed on the Fe3O4@Ppy complex and to ensure specificity, E. coli specific antibodies were conjugated. The resulting complex at various process parameters was characterized using FTIR, VSM, and SEM. SEM images were recorded to ensure bacterial separation at optimal process parameters. The impedance analysis and conductivity measurements were carried out for the sample volume of 15 μl. The bacterial suspension from 101–106 CFU ml−1 was successfully detected with a limit of detection of 10 CFU ml−1 within 10 min using a simplistic detection method.

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“…In order to exemplify, we mention the applications related to pseudocapacitor electrodes 3 , fabrication of cell layers creating in vivo electric fields 5 , radar or microwave absorbing materials which converts the electromagnetic energy into heat 6 , electrods for battery applications 7 , artificial muscles based on actuators with large strain and stress induced electrically 9 , photothermal agents 11 , covering layers for magnetic nanoparticles 13 , or transport mediators in liquid electrolites 14 .…”

Section: Introductionmentioning

confidence: 99%

Pentagon chain in external fields

Kovács

Gulácsi

2015

Philosophical Magazine

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We consider a pentagon chain described by a Hubbard type of model considered under periodic boundary conditions. The system i) is placed in an external magnetic field perpendicular to the plane of the cells, and ii) is in a site selective manner under the action of an external electric potential. In these conditions we show in an exact manner that the physical properties of the system can be qualitatively changed. The changes cause first strong modifications of the band structure of the system created by the one-particle part of the Hamiltonian, and second, produce marked changes of the phase diagram. We exemplify this by deducing ferromagnetic ground states in the presence of external fields in two different domains of the parameter space.

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Conducting Polypyrrole Shell as a Promising Covering for Magnetic Nanoparticles

Cited by 5 publications

References 69 publications

Studies on conducting nanocomposite with gallium nitride–doped ferrite, part-II

Studies on conducting nanocomposite with gallium nitride–doped ferrite, part-II

Development of nano-immunosensor with magnetic separation and electrical detection of Escherichia coli using antibody conjugated Fe₃O₄@Ppy

Pentagon chain in external fields

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Conducting Polypyrrole Shell as a Promising Covering for Magnetic Nanoparticles

Cited by 5 publications

References 69 publications

Studies on conducting nanocomposite with gallium nitride–doped ferrite, part-II

Studies on conducting nanocomposite with gallium nitride–doped ferrite, part-II

Development of nano-immunosensor with magnetic separation and electrical detection of Escherichia coli using antibody conjugated Fe3O4@Ppy

Pentagon chain in external fields

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Product

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Development of nano-immunosensor with magnetic separation and electrical detection of Escherichia coli using antibody conjugated Fe₃O₄@Ppy