The Fourier Self-Deconvolution of Raman Spectra

Bowley, H. J.; Collin, Suzanne; Gerrard, D.L.; James, D.; Maddams, W. F.; Tooke, Philip B.; Wyatt, I. D.

doi:10.1366/0003702854249475

Cited by 17 publications

(4 citation statements)

References 6 publications

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“…To improve the spectral resolution and resolve overlapped bands, Fourier self-deconvolution (FSD) was performed. The purpose of FSD is to make the spectra narrower but preserve the frequency and the integrated intensity of each line. − Therefore, FSD has been performed as a mathematical tool to differentiate the hematite and maghemite vibrational modes. We have followed the FSD method previously used by J. K. Kauppinen et al, with small modifications that concern the implementation of the Fourier transform, taking into consideration different parameters to have the best compromise between spectral resolution and the deconvolution of the Raman modes (see the Supporting Information).…”

Section: Results and Discussionmentioning

confidence: 99%

Thermal Route for the Synthesis of Maghemite/Hematite Core/Shell Nanowires

et al. 2017

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Nowadays, iron oxide-based nanostructures are key materials in many technological areas. Their physical and chemical properties can be tailored by tuning the morphology. In particular, the possibility of increasing the specific surface area has turned iron oxide nanowires (NWs) into promising functional materials in many applications. Among the different possible iron oxide NWs that can be fabricated, maghemite/hematite iron oxide core/shell have particular importance since they combine the magnetism of the inner maghemite core with the interesting properties of hematite in different technological fields ranging from green energy to biomedical applications. However, the study of these iron oxide structures is normally difficult due to the structural and chemical similarities between both iron oxide polymorphs. In this work we propose a route for the synthesis of maghemite/hematite NWs based on the thermal oxidation of previously electrodeposited iron NWs. A detailed spectroscopic analysis based on Raman, Mössbauer and X-ray absorption shows that the ratio of both oxides can be controlled during fabrication. Transmission Electron Microscopy has been used to check the core/shell structure of the NWs. The biocompatibility and capability of internalization of these NWs have also been proven to show the potential of these NWs in biomedical applications.

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Section: Results and Discussionmentioning

confidence: 99%

Thermal Route for the Synthesis of Maghemite/Hematite Core/Shell Nanowires

et al. 2017

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“…This technique can be successfully applied to the spectra of solutions, where vibration bands are widened in the liquid or solid state because of intermolecular interactions and cannot be distinguished in the amide envelope. Spectral ranges comprising broad and overlapping lines can thus be separated into sharp single lines [29].…”

Section: Infrared Spectroscopymentioning

confidence: 99%

Effects of the Addition of Sodium Chloride to a Tetrameric Protein in Water Solution During Exposure to High Frequency Electromagnetic Field

Calabrò¹,

Magazù²

2017

TOBIOTJ

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Background:Previous studies have shown that exposure to high frequency electromagnetic fields induces alterations in simple organic systems such as proteins in bidistilled water solution. Objective:The aim of this study was to test the shielding action of sodium chloride in bidistilled water solution against exposure to a high frequency electromagnetic field, in order to evaluate if the addition of NaCl in proteins aqueous solution can be considered a valuable bioprotector against electromagnetic fields. Method:Samples of 250 μl of different hemoglobin aqueous solutions, in the absence or presence of sodium-chloride, were exposed for 3 hours to an electromagnetic field at 1750 MHz at a power density around 1 W/m 2 emitted by an operational mobile phone. Fourier Transform Infrared Spectroscopy was used to study the effects of exposure on the secondary structure of hemoglobin also in the presence of sodium-chloride. Results:Spectral analysis evidenced that significant increase in intensity of the Amide I and II vibration bands in hemoglobin bidistilled water solution occurred after exposure to the electromagnetic field. This result can be due to the increase of dipole moment of the protein due to the alignment of α-helix towards the direction of the field. In contrast, no appreciable change was observed in hemoglobin in sodium-chloride water solution after exposure. Conclusion:This protective effect of sodium-chloride can be explained by the orientation of water molecules due to the strong electric field around each ion that reduces the possibility of rotation of the protein in response to an applied electromagnetic field.

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“…Developments in Raman microscopes have also been the subject of several papers. The use of high-numerical-aperture objectives has been evaluated (77). The handling of minute samples for Raman spectroscopy has been the subject of a new patent (72), and a new generation of instruments (73), particularly with respect to mapping (74), has been reported.…”

Section: Instrumentation and Samplingmentioning

confidence: 99%