A tunable optical filter

Philip, John; Jaykumar, T.; Kalyanasundaram, P.; Raj, Baldev

doi:10.1088/0957-0233/14/8/314

Cited by 123 publications

(57 citation statements)

References 13 publications

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“…Magnetic particles are gaining attraction due to a variety of technological applications such as high-density information storage nanodevices, ferrofluids, magnetic refrigeration, residential cooling, and biomedical applications like magnetic separations, biosensors, resonance imaging, hyperthermia, and targeted and controlled drug delivery. In this regard, spinel ferrites are particularly important because of their excellent magnetic properties that can be tuned to suit the requirement using chemical manipulations [7][8][9][10][11]. However, the development of novel techniques for improvements of the magnetic and the structural properties of soft magnetic spinel ferrites has been the objective of numerous studies in past decades.…”

Section: Introductionmentioning

confidence: 99%

Influence of Zn2+ doping on the structural and surface morphological properties of nanocrystalline Ni-Cu spinel ferrite

Awati¹,

Rathod

Mane

et al. 2013

Int Nano Lett

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Ni 0.8−x Cu 0.2 Zn x Fe 2 O 4 (x = 0.0 ≤ 0.6 with steps of 0.2) ferrite nanophase was achieved by sol-gel auto-combustion technique. The as-prepared samples were thermally characterized by thermogravimetry/differential thermal analysis to obtain firing temperature of the materials. The X-ray diffraction pattern indicates the formation of a single-phase cubic spinel structure and shows strong influence of the incorporation of Zn 2+ metal ions on the spinel structure. The annealing treatment does not alter the crystal structure but increases the crystallinity of the samples. The morphological investigations and nanometric sizes of the samples were studied by scanning electron microscopy and transmission electron microscopy. The crystallographic texture due to annealing and Zn 2+ ion doping was systematically investigated by Fourier transform infrared spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Influence of Zn2+ doping on the structural and surface morphological properties of nanocrystalline Ni-Cu spinel ferrite

Awati¹,

Rathod

Mane

et al. 2013

Int Nano Lett

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“…For instance, an emulsion of water-based ferrofluid in oil can be formed in a T-junction microchannel . Ferrofluid droplets and emulsions have a variety of applications in biology and engineering such as detection of defects in ferromagnetic components (Philip et al 1999), cell sorting (Zborowski et al 1999;Kose et al 2009), optical filter (Philip et al 2003), PCR (Sun et al 2007), pump and valve (Hartshorne et al 2004). In addition, ferrofluid emulsion was used as shadow mask for microfabrication to prevent chemical and UV exposure by varying the pattern of magnetic field (Yellen et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations of the formation process of ferrofluid droplets

Liu

Tan

Yap

et al. 2011

Microfluid Nanofluid

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This paper reports both experimental and numerical investigations of the formation process of ferrofluid droplets in a flow focusing configuration with and without an applied magnetic field. In the experiment, the homogenous magnetic field was generated using an electromagnet. The magnetic field in the flow direction affects the formation process and changes the size of the droplets. The change in the droplet size depends on the magnetic field strength and the flow rates. A numerical model was used to investigate the force balance during the droplet breakup process. A linearly magnetizable fluid was assumed. Particle level set method was employed to capture the interface movement between the continuous fluid and the dispersed fluid. Results of the droplet formation process and the flow field are discussed for both cases with and without the magnetic field. Finally, experimental and numerical results are compared.

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“…The fields in which these particles are used are: biomedical, catalysis, and industrial field. Magnetite particles (Fe 3 O 4 ) dispersed in a fluid were largely used as ferrofluids [118,119] in diverse applications, such as: electric transformers, pressure transducers, inertial sensors (acceleration, slope, gravity) [120], position sensors [121], devices for information storage [122], heat transfer [123], optics [124,125], electronics [126], and biomedical engineering [22,[127][128][129][130].…”

Section: Applications Of Magnetic Nanoparticlesmentioning

confidence: 99%

Pros and Cons on Magnetic Nanoparticles Use in Biomedicine and Biotechnologies Applications

Bojin

Păunescu

2014

Nanoparticles' Promises and Risks

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In recent years, the design and synthesis of colloidal magnetic suspensions have attracted an increased interest especially in the fields of biotechnology and biomedicine because they have many applications including targeted drug delivery, cell labeling and magnetic cell separation, hyperthermia, tissue repairing, magnetic resonance imaging (MRI) contrast enhancement, enzyme immobilization, immunoassays, protein purification, etc. IntroductionMagnetic nanoparticles (MNPs) used in biomedicine must meet several requirements. They have to be non-toxic, chemically stabile, uniform in size, well stabilized under physiological conditions, biocompatible and to present high magnetization. Magnetite (Fe 3 O 4 ) and maghemite (γ-Fe 2 O 3 ) are the most suitable iron oxide nanoparticles employed for biomedical applications because they are biocompatible, have low toxicity in the human body and show a superparamagnetic behavior.Therefore, synthesis of magnetic iron oxide nanoparticles with tailored properties has attracted considerable scientific and technological interest. Various synthesis routes were developed for producing magnetic particles, such as co-precipitation, microemulsion method, thermal decomposition of different organic precursors, spray pyrolysis, and sol-gel method.For biomedical applications, magnetic iron oxide nanoparticles must be dispersed in biocompatible media in order to obtain stable colloidal suspensions. In order to prevent the particle aggregation and to improve the biocompatibility and stability, nanoparticles are coated with various surfactants: poly(ethylene glycol),

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A tunable optical filter

Cited by 123 publications

References 13 publications

Influence of Zn2+ doping on the structural and surface morphological properties of nanocrystalline Ni-Cu spinel ferrite

Influence of Zn2+ doping on the structural and surface morphological properties of nanocrystalline Ni-Cu spinel ferrite

Numerical and experimental investigations of the formation process of ferrofluid droplets

Pros and Cons on Magnetic Nanoparticles Use in Biomedicine and Biotechnologies Applications

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