Fabrication and properties of magnetic particles with nanometer dimensions

O’Connor, Charles J.; Kolesnichenko, Vladimir; Carpenter, Everett E.; Sangregorio, Claudio; Zhou, Weilie; Kumbhar, Amar; Sims, Jessica; Agnoli, F.

doi:10.1016/s0379-6779(01)00328-9

Cited by 68 publications

(48 citation statements)

References 11 publications

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“…4,7,8,[11][12][13] It was carried out in a reverse micelle reaction under Ar, utilizing Schlenk line techniques. Cetyltrimethylammonium bromide, 1-butanol, and octane were used as the surfactant, the co-surfactant, and the oil phase, respectively.…”

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confidence: 99%

Characterization and magnetic properties of core/shell structured Fe/Au nanoparticles

Cho

Kauzlarich

Olamit

et al. 2004

Journal of Applied Physics

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Au-coated Fe nanoparticles have been prepared by using a reverse micelle method through reduction of an aqueous solution. Characterizations have been carried out over time to probe the oxidation of Fe. Immediately after synthesis, the samples exhibit metallic conduction and a negative magnetoresistance, consistent with the presence of α-Fe. The temperature dependence of magnetization displays a maximum at a blocking temperature of around 150 K. After a period of 1 month, the samples exhibit insulating behavior, indicating the oxidation of the Fe core. Mössbauer spectroscopy indicates the presence of an α-Fe component and a broad distribution of local environments.

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mentioning

confidence: 99%

Characterization and magnetic properties of core/shell structured Fe/Au nanoparticles

Cho

Kauzlarich

Olamit

et al. 2004

Journal of Applied Physics

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“…Synthesis methods for magnetite nanoparticles are widely available in the literature. They include gas phase deposition [42,43], electron beam lithography [44,45], microemulsion [46,47], sonochemical synthesis [48] and hydrolytic reaction [49 -53]. Hydrolytic reaction is based on the coprecipitation of Fe 2þ and Fe 3þ aqueous salt solutions by adding a base.…”

Section: Synthesis and Surface Modification Of Magnetic Particlesmentioning

confidence: 99%

Micro‐ and Nano‐ Magnetic Particles for Applications in Biosensing

2007

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This article reviews the development of electrochemical biosensors, incorporating magnetic particles, for detecting biomolecules (nucleic acids and proteins) and cells. Magnetic particles (MPs) of micro-and nanoscale, mimicking the size of molecules in nature, possess interesting characteristics that facilitate the purification and detection of biomolecules in a wide range of samples. In particular, the high surface area and the paramagnetic or superparamagnetic properties of these tiny particles provide an attractive technology platform for the design of electrochemical biosensors. Examples of electrochemistry-based approaches to achieve the separation and detection of bioentities utilizing MPs are described. Emphasis is placed on the strategies to incorporate the electrochemical labels to the MPs and the methods to achieve the dual function of electrochemical detection and magnetic separation. The protocols to make MPs as labels in biological sensors are also discussed.

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“…The two curves display antiferromagnetic behavior, as previously detected in KMnF 3 nanoparticles. [10,28] The ZFC and FC plots diverge from each other at around 87 K, corresponding to the reported Néel temperature of T N = 88 K. [53] Above T N , the two curves are coincident, and moreover obey the Curie-Weiss law, v = C / (T -H), with a calculated paramagnetic Curie temperature of T C = -192.6 K, which is comparable with the previously reported value of -191.7 K for this system. [28] A detailed plot of the inverse magnetic susceptibility (1/v) vs. temperature (K) used to calculate T C is shown in Figure 6B.…”

Section: Magnetic Characterizationmentioning

confidence: 99%

“…[5][6][7][8][9] Many of the relevant devices used in electronics employ ferromagnetic materials such as iron or cobalt-based alloys as well as ferrite materials. [10][11][12][13][14] In addition, magnetoelectronic effects have been studied in multiferroics, which possess two or more switchable states such as polarization, magnetization, or strain. [9] It is noteworthy that antiferromagnetic surfaces are often used to pin the magnetization direction of intrinsically bistable ferromagnetic films through the exchange-bias effect, [15,16] which is widely used in state-of-the-art magnetic storage devices.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis and Property Characterization of Single‐Crystalline Perovskite Fluoride Nanorods

Zhang

Mao

Park

et al. 2007

Adv Funct Materials

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The generalized green synthesis of single‐crystalline KMnF3 and NH4MnF3 nanorods as well as of their rare‐earth ion doped analogues, possessing reproducible shape and controllable size, has been achieved using a modified template‐directed approach under ambient room‐temperature conditions, with simple inorganic salts as functional precursors. Extensive characterization of the resulting nanorods has been performed using diffraction, electron microscopy, optical spectroscopy, as well as magnetic techniques. We have studied the antiferromagnetism of as‐prepared ternary metal fluoride nanorods as well as the luminescence of their as‐doped counterparts. Our collective data suggest the possibility of the incorporation of these high‐quality, chemically pure materials into functional nanoscale devices with various potential applications that exploit the interesting optomagnetic properties of these systems.

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Fabrication and properties of magnetic particles with nanometer dimensions

Cited by 68 publications

References 11 publications

Characterization and magnetic properties of core/shell structured Fe/Au nanoparticles

Characterization and magnetic properties of core/shell structured Fe/Au nanoparticles

Micro‐ and Nano‐ Magnetic Particles for Applications in Biosensing

Green Synthesis and Property Characterization of Single‐Crystalline Perovskite Fluoride Nanorods

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