Refractive Indices of Coordination Compounds of d- and f-Metals

Бацанов, С. С.; Ruchkin, Evgeny D.; Poroshina, Inga A.

doi:10.1007/978-981-10-0797-2_10

Cited by 6 publications

(11 citation statements)

References 6 publications

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“…For our FDTD simulations, optical constants were obtained from literature for CoFe 2 O 4 [61] and MnFe 2 O 4 . [62] The thinnest shell (1.5 nm) enhances the field by about 11% compared to the bare seeds, while the 2.5 nm shell enhances the field by about 100% (see Figure 6). No further enhancement is seen for the 3 nm shell.…”

Section: Resultsmentioning

confidence: 96%

Enhanced Ultrafast Nonlinear Optical Response in Ferrite Core/Shell Nanostructures with Excellent Optical Limiting Performance

Perumbilavil

López‐Ortega

Tiwari

et al. 2018

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Nonlinear optical nanostructured materials are gaining increased interest as optical limiters for various applications, although many of them suffer from reduced efficiencies at high-light fluences due to photoinduced deterioration. The nonlinear optical properties of ferrite core/shell nanoparticles showing their robustness for ultrafast optical limiting applications are reported. At 100 fs ultrashort laser pulses the effective two-photon absorption (2PA) coefficient shows a nonmonotonic dependence on the shell thickness, with a maximum value obtained for thin shells. In view of the local electric field confinement, this indicates that core/shell is an advantageous morphology to improve the nonlinear optical parameters, exhibiting excellent optical limiting performance with effective 2PA coefficients in the range of 10 cm W (100 fs excitation), and optical limiting threshold fluences in the range of 1.7 J cm . These values are comparable to or better than most of the recently reported optical limiting materials. The quality of the open aperture Z-scan data recorded from repeat measurements at intensities as high as 35 TW cm , indicates their considerably high optical damage thresholds in a toluene dispersion, ensuring their robustness in practical applications. Thus, the high photostability combined with the remarkable nonlinear optical properties makes these nanoparticles excellent candidates for ultrafast optical limiting applications.

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Section: Resultsmentioning

confidence: 96%

Enhanced Ultrafast Nonlinear Optical Response in Ferrite Core/Shell Nanostructures with Excellent Optical Limiting Performance

Perumbilavil

López‐Ortega

Tiwari

et al. 2018

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“…The assumption is made that the layer formed at the steel surface is pure iron oxide, which is in fair agreement with the nominal composition of steel used in this work, and that the oxide is pure hematite (refractive index is n F = 2.92). In the case of a layer made of magnetite (Fe 3 O 4 ), an n F value of 2.42 has to be taken into account, but the same linear variation is observed. Note that the accessible domain shown here (between 3 and 4 nm for a 10% of relative reflectivity variation for Fe 2 O 3 ) is fully compatible with the characteristic dimensions usually encountered for a passive layer on steel in NaOH solution .…”

Section: Theorymentioning

confidence: 85%

Imaging of a Thin Oxide Film Formation from the Combination of Surface Reflectivity and Electrochemical Methods

et al. 2017

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Electrochemical methods (cyclic voltammetry (CV), potential steps, and electrochemical impedance spectroscopy) were successfully combined with in situ reflectometry measurements for a detailed analysis of the passive layer evolution as a function of the electrode potential. Interestingly, both EIS and surface reflectivity allowed a film thickness in the nanometer range to be readily determined. In addition, transient analyses of the reflectivity simultaneously recorded with CVs show the formation of both FeO and FeO oxides. The image analysis showed that the steel surface reactivity is heterogeneous and presents micrometric islands coated with a thicker oxide layer than the surrounding surface. The in situ combination of these techniques thus offers a powerful analytical description of the interface on a local scale and its transient response to a perturbation.

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“…Dynamic light scattering (DLS) and zeta-potential measurements were performed on a Zetasizer Nano ZS (Malvern) in high dilution. For DLS measurements a refractive index of 2.39 for MgFe 2 O 4 was assumed . For analysis of aqueous solutions polystyrol cuvettes ( d = 1 cm) were used, whereas quartz glass cuvettes ( d = 1 cm, Hellma) were chosen for nonaqueous solutions.…”

Section: Experimental Sectionmentioning

confidence: 99%

Stabilization of Monodisperse, Phase-Pure MgFe₂O₄ Nanoparticles in Aqueous and Nonaqueous Media and Their Photocatalytic Behavior

et al. 2017

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Monodisperse, monocrystalline magnesium ferrite (MgFe2O4) nanoparticles were synthesized phase purely by fast nonaqueous microwave-assisted solution-phase synthesis. Colloidal stabilization of the nanocrystals in nonaqueous media was realized either in-situ during synthesis or postsynthetically by surface capping with oleylamine and oleic acid. Phase transfer to aqueous media was performed employing citric acid and betaine hydrochloride, resulting in agglomerate-free dispersions of citrate- or betaine-functionalized MgFe2O4 nanocrystals. Furthermore, a one-step synthesis of highly stable, water-dispersible colloids of MgFe2O4 was achieved using polyvinylpyrrolidone as stabilizer. Characterization of the as-synthesized and functionalized nanoparticles was performed employing X-ray diffraction, UV–vis and infrared spectroscopy, thermogravimetry, dynamic light scattering, and transmission electron microscopy. Special focus was laid on phase purity, which was thoroughly monitored using Raman microscopy/spectroscopy. Photocatalytic reactions were performed to evaluate the use of such highly stable ferrite colloids for solar energy conversion.

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Refractive Indices of Coordination Compounds of d- and f-Metals

Cited by 6 publications

References 6 publications

Enhanced Ultrafast Nonlinear Optical Response in Ferrite Core/Shell Nanostructures with Excellent Optical Limiting Performance

Enhanced Ultrafast Nonlinear Optical Response in Ferrite Core/Shell Nanostructures with Excellent Optical Limiting Performance

Imaging of a Thin Oxide Film Formation from the Combination of Surface Reflectivity and Electrochemical Methods

Stabilization of Monodisperse, Phase-Pure MgFe₂O₄ Nanoparticles in Aqueous and Nonaqueous Media and Their Photocatalytic Behavior

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Refractive Indices of Coordination Compounds of d- and f-Metals

Cited by 6 publications

References 6 publications

Enhanced Ultrafast Nonlinear Optical Response in Ferrite Core/Shell Nanostructures with Excellent Optical Limiting Performance

Enhanced Ultrafast Nonlinear Optical Response in Ferrite Core/Shell Nanostructures with Excellent Optical Limiting Performance

Imaging of a Thin Oxide Film Formation from the Combination of Surface Reflectivity and Electrochemical Methods

Stabilization of Monodisperse, Phase-Pure MgFe2O4 Nanoparticles in Aqueous and Nonaqueous Media and Their Photocatalytic Behavior

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Product

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About

Stabilization of Monodisperse, Phase-Pure MgFe₂O₄ Nanoparticles in Aqueous and Nonaqueous Media and Their Photocatalytic Behavior