Superparamagnetic Magnetite Nanoparticle Superstructures for Optical Modulation/Chopping

Zorba, Serkan; Maxwell, Randolph Thomas; Farah, Constantine; He, Le; Yin, Yadong

doi:10.1021/jp1055599

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…It is reported that these optically active magnetic nanochains may find great applications in biological and chemical sensing and biomedical labeling and imaging. [171][172][173][174][175] Fig. 5 Scheme of the polymer shell by the thermal decomposition method.…”

Section: Optical Propertiesmentioning

confidence: 99%

Multifunctional composite core–shell nanoparticles

et al. 2011

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In this review paper, the state-of-the-art knowledge of the core-shell multifunctional nanoparticles (MNPs), especially with unique physiochemical properties, is presented. The synthesis methods were summarized from the aspects of both the advantages and the demerits. The core includes the inexpensive and easily oxidized metals and the noble shells include the relatively noble metals, carbon, silica, other oxides, and polymers. The properties including magnetic, optical, anti-corrosion and the surface chemistry of the NPs are thoroughly reviewed. The current status of the applications is reviewed with the detailed examples including the catalysis, giant magnetoresistance (GMR) sensing, electromagnetic interface shielding or microwave absorption, biomedical drug delivery, and the environmental remediation.

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Section: Optical Propertiesmentioning

confidence: 99%

Multifunctional composite core–shell nanoparticles

et al. 2011

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“…To obtain a quantitative understanding of its switching frequency, we studied the optical properties of the liquid crystal under a high-frequency alternating magnetic field. Upon application of the magnetic field, the nanorods oscillate as a result of the quick switching of field polarity from one direction to the opposite. − As the orientation of the nanorods is temporarily displaced from the equilibrium position, which is parallel to the transmission axis of the polarizer, a laser beam passes through the cross polarizer and gives a detectable signal. The black curve in Figure a indicates that this liquid crystal exhibits a rapid response to an alternating 5 mT field.…”

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confidence: 99%

Magnetically Actuated Liquid Crystals

et al. 2014

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Ferrimagnetic inorganic nanorods have been used as building blocks to construct liquid crystals with optical properties that can be instantly and reversibly controlled by manipulating the nanorod orientation using considerably weak external magnetic fields (1 mT). Under an alternating magnetic field, they exhibit an optical switching frequency above 100 Hz, which is comparable to the performance of commercial liquid crystals based on electrical switching. By combining magnetic alignment and lithography processes, it is also possible to create patterns of different polarizations in a thin composite film and control over the transmittance of light in particular areas. Developing such magnetically responsive liquid crystals opens the door toward various applications, which may benefit from the instantaneous and contactless nature of magnetic manipulation.

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“…where A is the absorbance of the ultra violet visible spectrum and d is the thickness of the quartz vessel used during violet -visible analysis [37][38][39].…”

Section: Resultsmentioning

confidence: 99%

Photoelectrochemical, optical and magnetic properties of magnetite nanoparticles

Chetibi,

Ouazouaz,

Hamana

et al. 2023

Materialwissenschaft Werkst

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Magnetite magnetic nanoparticles are prepared using olive leaf extract as a green reducing and stabilizing agents. After reaction the product is heated up to get rid of the organic compounds and get pure magnetite nanoparticles. Differential scanning calorimetry is used to study the phase transformation as a function of heating temperature. Scanning electron microscope and high resolution transmission electron microscope show spherical and crystallized nanoparticles with a size of 5 nm. X‐ray diffraction and Raman and x‐ray photoelectron spectroscopy indicate the formation of Magnetite phase with high cristallinity and purity. The synthesized Magnetite nanoparticles are semiconductors with gap energy around 2 eV. Observed by transmission electron microscope graphite rods with stacked carbon disks are decorated with the prepared nanoparticles and show enhanced photocurrent. The vibrating sample magnetometer measurements indicate that the prepared Magnetite nanoparticles have superparamagnetic behavior. These results are very promising for clinical and water splitting applications.

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Superparamagnetic Magnetite Nanoparticle Superstructures for Optical Modulation/Chopping

Cited by 7 publications

References 29 publications

Multifunctional composite core–shell nanoparticles

Multifunctional composite core–shell nanoparticles

Magnetically Actuated Liquid Crystals

Photoelectrochemical, optical and magnetic properties of magnetite nanoparticles

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