Search results for "Chemical imaging"

showing 3 items of 3 documents

3D spectral imaging with synchrotron Fourier transform infrared spectro-microtomography

2013

We report Fourier transform infrared spectro-microtomography, a nondestructive three-dimensional imaging approach that reveals the distribution of distinctive chemical compositions throughout an intact biological or materials sample. The method combines mid-infrared absorption contrast with computed tomographic data acquisition and reconstruction to enhance chemical and morphological localization by determining a complete infrared spectrum for every voxel (millions of spectra determined per sample).

Chemical imagingmedicine.medical_specialtyMaterials scienceInfrared spectroscopyBiochemistryFourier transform spectroscopyPhysics::GeophysicsMicesymbols.namesakeImaging Three-DimensionalOpticsSpectroscopy Fourier Transform InfraredMicroscopyImage Processing Computer-AssistedmedicineAnimalsHumansFourier transform infrared spectroscopyMolecular BiologyEmbryonic Stem Cellsbusiness.industryX-Ray MicrotomographyCell BiologyWoodSpectral imagingPopulusFourier transformsymbolsbusinessChemical fingerprintingSynchrotronsHairBiotechnologyNature Methods
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Toward Three-Dimensional Chemical Imaging of Ternary Cu–Sn–Pb Alloys Using Femtosecond Laser Ablation/Ionization Mass Spectrometry

2017

Femtosecond laser ablation/ionization mass spectrometry (LIMS) has been applied to probe the spatial element composition of three ternary Cu-Sn-Pb model bronze alloys (lead bronzes: CuSn10Pb10, CuSn7Pb15, and CuSn5Pb20), which were recently identified as high-performance cathode materials in the context of electro-organic synthesis (dehalogenation, deoxygenation) of pharmaceutically relevant building blocks. The quantitative and spatially resolved element analysis of such cathode materials will help in understanding the observed profound differences in their electrochemical reactivity and stability. For that purpose, we developed a measurement procedure using the LIMS technique which allows…

Chemical imagingChemistry530 Physics520 Astronomy010401 analytical chemistryAnalytical chemistryContext (language use)02 engineering and technology021001 nanoscience & nanotechnologyElectrochemistry620 Engineering01 natural sciencesCathode0104 chemical sciencesAnalytical Chemistrylaw.inventionlaw540 Chemistry570 Life sciences; biologyReactivity (chemistry)0210 nano-technologyTernary operationChemical compositionDeoxygenation
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Nondestructive full-field imaging XANES-PEEM analysis of cosmic grains

2006

For chemical analysis of submicron particles, mass spectrometric methods have the disadvantage of being destructive. Thus, a nondestructive elemental and chemical mapping with a high spatial resolution prior to mass analysis is extremely valuable to precharacterize the sample. Here, first results are presented of combined XANES (x-ray absorption near-edge structure) and PEEM (photoemission electron microscopy) measurements on a cosmic grain fraction from the Murchison meteorite. This nondestructive full-field imaging method is well suited for a quantitative analysis and for a preselection prior to detailed mass spectrometric investigations with isotopic resolution/selectivity. A spectral un…

Chemical imagingMurchison meteoritePhotoemission electron microscopyNuclear magnetic resonanceMaterials scienceComposite numberResolution (electron density)Analytical chemistryAbsorption (logic)Condensed Matter PhysicsImage resolutionXANESElectronic Optical and Magnetic MaterialsPhysical Review B
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