Search results for " EDXD"

showing 3 items of 3 documents

Low-Q peak in X-ray patterns of choline-phenylalanine and homophenylalanine: a combined effect of chain and stacking

2016

Abstract In this contribution we report for the first time the X-ray patterns of choline-phenylalanine and choline-homophenylalanine ionic liquids. The presence of a low Q peak in both systems is another evidence that a long alkyl chain is not always needed to establish a nanodomain segregation in the liquid sufficient to be revealed by the diffraction experiment. These new data are compared with the diffraction patterns and the theoretical calculations of other choline-aminoacid ionic liquids recently reported. A significant role might be played by the stacking interactions between aromatic rings.

DiffractionChemical substancePhenylalanineStackingGeneral Physics and AstronomyPhenylalanine02 engineering and technologyIonic liquid010402 general chemistry01 natural sciencesCholinePhysics and Astronomy (all)chemistry.chemical_compoundAminoacidSettore CHIM/02Organic chemistryPhysical and Theoretical ChemistryAlkylcholine-amino acid ionic liquids EDXD; ion pairs; pre-peak; renewable materialschemistry.chemical_classificationSmall-angle X-ray scatteringSAXS; Choline; Phenylalanine; Aminoacids; Ionic liquidsAromaticitySAXS021001 nanoscience & nanotechnologyIonic liquids0104 chemical sciencesCrystallographychemistryIonic liquid0210 nano-technologyAminoacids
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An Iranian booklet: non destructive examination by Energy Dispersive X-Ray Diffractometry and Micro-Raman Spectroscopy

2009

Energy Dispersive X-Ray Diffractometry was used in combination with micro-Raman Spectroscopy to study an undated illuminated Iranian booklet. In both cases, no preliminary preparation of the samples was needed: the data were acquired in a non-destructive way in a natural environment. The book is of particular interest because of the unusual presence of miniatures on some pages. The two techniques were used to collect data from small areas of the pages and in different regions of the miniature in order to identify inks and pigments and to attempt chronological assignment. Raman spectra were affected by strong background fluorescence. In spite of this, different peaks were detected and identi…

micro-Raman Spectroscopy EDXD pigment identification inks paper.Settore CHIM/02 - Chimica Fisica
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Energy dispersive X-ray diffraction potentiality in the field of cultural heritage: simultaneous structural and elemental analysis of various artefac…

2007

The applicability of an Energy Dispersive X-ray Diffractometer to some technical questions in the field of Cultural Heritage is presented. This diffractometer, equipped with a white source, has been utilized for the structural and elemental analysis of some items having different nature. Given its design, the instrument allows to collect data from samples as big as a book or a little more. Samples, without collection of any portion and without any preliminary preparation, have been placed in the instrument and spectra have been collected in a wide energy range that contains X-ray fluorescence and diffraction features. In all cases, data acquired in air and in a non destructive way were reli…

DiffractionMaterials scienceField (physics)business.industryAnalytical chemistrycultural heritageAnalytical ChemistryCultural heritageOpticsSpectrometry FluorescenceX-Ray DiffractionElemental analysiscultural heritage; edxdNon destructiveedxdMicroscopy Electron ScanningEnergy-dispersive X-ray diffractionEDXD Cultural HeritagebusinessArtGeneral Environmental ScienceDiffractometerAnnali di chimica
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