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Articles de revues sur le sujet « Raman micro-Spectrometry »

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Auteur : Grafiati
Publié le 25 mai 2024

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1

Dubessy, Jean, Marie-Christine Boiron, Alain Moissette, Christophe Monnin et Natalya Sretenskaya. « Determinations of water, hydrates and pH in fluid inclusions by micro-Raman spectrometry ». European Journal of Mineralogy 4, no 5 (14 octobre 1992) : 885–94. http://dx.doi.org/10.1127/ejm/4/5/0885.

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2

Adar, F., B. Lenain, D. C. Cook et S. J. Oh. « Corrosion Product Identification by Micro-Raman and Mossbauer Spectroscopy ». Microscopy and Microanalysis 4, S2 (juillet 1998) : 506–7. http://dx.doi.org/10.1017/s1431927600022650.

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Micro-Raman spectrometry and Mossbauer spectroscopy have been used to identify the corrosion products on a steel coupon exposed in an industrial environment for 16 years. The Raman analysis was performed on a polished metallographic cross-section in order to map the oxides across the thickness of the coating. The spectra were recorded using a LabRam Micro-Raman spectrograph incorporating a 17 mW HeNe laser (attenuated to 1 mW to prevent oxide transformation), focused to 1 μm spot size, and 1800 g/mm grating. The confocal line-scan imaging enabled 100 spectra to be recorded in one scan at 0.5 um intervals across the thickness of the coating. The Mossbauer analysis was performed using in-situ scattering Mossbauer spectroscopy on the attached corrosion coating and transmission Mossbauer spectroscopy at 300K and 77K on the removed coating, to measure the fraction of each oxide present. Micro-Raman spectrometry showed that the corrosion products had formed in distinct layers as shown in Figure 1.
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Li, Xue, Li Wu, Ji-Soo Lee et Chul-Un Ro. « Hygroscopic behavior and chemical reactivity of aerosols generated from mixture solutions of low molecular weight dicarboxylic acids and NaCl ». Physical Chemistry Chemical Physics 23, no 18 (2021) : 11052–64. http://dx.doi.org/10.1039/d1cp00590a.

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Investigation of laboratory-generated NaCl—dicarboxylic acid mixture aerosols was extensively performed using in situ Raman micro-spectrometry, clearly elucidating their hygroscopic behavior and chemical reactivity.
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4

Liu, Yande, et Bingbing He. « Quantitative of pesticide residue on the surface of navel orange by confocal microscopy Raman spectrometer ». Journal of Innovative Optical Health Sciences 08, no 02 (mars 2015) : 1550001. http://dx.doi.org/10.1142/s1793545815500017.

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The potential of Confocal micro-Raman spectroscopy in the quantitative analysis of pesticide (Chlorpyrifos, Omethoate) residues on orange surface is investigated in this work. Quantitative analysis models were established by partial least squares (PLS) using different preprocessing methods (Smoothing, First derivative, MSC, Baseline) for pesticide residues. For pesticide residues, the higher correlation coefficients (r) is 0.972 and 0.943, the root mean square error of prediction (RMSEP) is 2.05% and 2.36%, respectively. It is therefore clear that Confocal micro-Raman spectroscopy techniques enable rapid, nondestructive and reliable measurements, so Raman spectrometry appears to be a promising tool for pesticide residues.
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5

Yomogida, T., F. Esaka et M. Magara. « Chemical state and isotope ratio analysis of individual uranium particles by a combination of micro-Raman spectroscopy and secondary ion mass spectrometry ». Analytical Methods 9, no 44 (2017) : 6261–66. http://dx.doi.org/10.1039/c7ay01815k.

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An analytical procedure using micro-Raman spectroscopy (MRS) and secondary ion mass spectrometry (SIMS) was developed to elucidate both the chemical states and isotope ratios of individual micron-sized uranium particles.
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Bremard, C., P. Dhamelincourt, J. Laureyns et G. Turrell. « The Effect of High-Numerical-Aperture Objectives on Polarization Measurements in Micro-Raman Spectrometry ». Applied Spectroscopy 39, no 6 (novembre 1985) : 1036–39. http://dx.doi.org/10.1366/0003702854249754.

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Polarized Raman spectra of the reference materials carbon tetrachloride and α-quartz are obtained with the Raman microprobe MOLE with the use of different high-numerical-aperture objectives. The depolarization ratios of the Raman bands of isotropic samples are in good agreement with those obtained with the use of conventional instruments, provided that the reflection or transmission factor of the beamsplitter is introduced as a correction. Even with the very wide-aperture objectives used, the depolarization effect is not large and can be evaluated theoretically. Correct polarized spectra of anisotropic samples can also be obtained with a Raman microspectrometer. Here again, the depolarization effect induced by the wide-aperture objective is not large and can be evaluated theoretically if the birefringence of the crystal does not play a significant role. The depolarization induced by the birefringence is especially important when incident and scattered light propagate in a direction close to the optical axis of the crystal, but can be minimized by a reduction of the optical path within the sample.
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Nagy, Brigitta, Attila Farkas, Attila Balogh, Hajnalka Pataki, Balázs Vajna, Zsombor K. Nagy et György Marosi. « Quantification and handling of nonlinearity in Raman micro-spectrometry of pharmaceuticals ». Journal of Pharmaceutical and Biomedical Analysis 128 (septembre 2016) : 236–46. http://dx.doi.org/10.1016/j.jpba.2016.05.036.

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8

Arakawa, Masashi, Junji Yamamoto et Hiroyuki Kagi. « Developing Micro-Raman Mass Spectrometry for Measuring Carbon Isotopic Composition of Carbon Dioxide ». Applied Spectroscopy 61, no 7 (juillet 2007) : 701–5. http://dx.doi.org/10.1366/000370207781393244.

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We investigated the applicability of micro-Raman spectroscopy for determining carbon isotopic compositions (13C/12C) of minute CO2 fluid inclusions in minerals. This method is nondestructive and has sufficiently high spatial resolution (1 μm) to measure each fluid inclusion independently. Raman spectra of CO2 fluid have 12CO2-origin peaks at about 1285 cm−1 and 1389 cm−1 (v12− and v12+) and a 13CO2-origin peak at about 1370 cm−1 (v13+). The relationship between carbon isotopic compositions and peak intensity ratios of v12+ and v13+ was calibrated. Considering several factors affecting the peak intensity ratio, the error in obtained carbon isotopic composition was 2% (20‰). The reproducibility of the intensity ratio under the same experimental environment was 0.5% (5‰). Within these error values, we can distinguish biogenic CO2 from abiogenic CO2.
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Pagès-Camagna, Sandrine, et Thomas Calligaro. « Micro-PIXE and micro-Raman spectrometry applied to a polychrome wooden altarpiece from the 16th century ». Journal of Raman Spectroscopy 35, no 89 (6 juillet 2004) : 633–39. http://dx.doi.org/10.1002/jrs.1216.

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Akyuz, Sevim, Tanil Akyuz, Sait Basaran, Cetin Bolcal et Ahmet Gulec. « Analysis of ancient potteries using FT-IR, micro-Raman and EDXRF spectrometry ». Vibrational Spectroscopy 48, no 2 (novembre 2008) : 276–80. http://dx.doi.org/10.1016/j.vibspec.2008.02.011.

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11

Haley, L. V., C. L. Chakrabarti et Shaole Wu. « Micro-Raman analysis of pyrolytic graphite platforms used in atomic absorption spectrometry ». Journal of Raman Spectroscopy 20, no 4 (avril 1989) : 273–75. http://dx.doi.org/10.1002/jrs.1250200413.

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Colomban, Ph, et J. Corset. « Foreword to the special issue on Raman (micro)spectrometry and materials science ». Journal of Raman Spectroscopy 30, no 10 (octobre 1999) : 863–66. http://dx.doi.org/10.1002/(sici)1097-4555(199910)30:10<863 ::aid-jrs492>3.0.co;2-l.

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Fletcher, Robert A., et Edgar S. Etz. « Complementary Molecular Information on Phthalocyanine Compounds Derived From Laser Microprobe Mass Spectrometry and Micro-Raman Spectroscopy ». Proceedings, annual meeting, Electron Microscopy Society of America 48, no 2 (12 août 1990) : 300–301. http://dx.doi.org/10.1017/s0424820100135101.

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Various metal phthalocyanines (Pc's) have come under study because of their optoelectric properties which make them attractive materials for fabrication of ultra-fast molecular electronic devices. Probably the most extensively investigated metal Pc is vanadyl phthalocyanine, VOPc, which has been proposed as a medium for optical storage devices and has been shown to be a photoconductor in the infrared. Several methods have been used to elucidate the relationship between molecular structure and the Pc's optical and electronic properties.The thrust of this work is to show how well laser microprobe mass spectrometry (LAMMS) and micro-Raman spectroscopy complement each other to provide information so that structural assignments can be made. The vibrational frequencies obtained from micro-Raman spectroscopy indicate molecular structure while mass spectrometry provides the mass (m/z) of the molecule along with certain features of the structure through the fragmentation process. The compounds studied are the metal-free Pc (H2PC), and the derivatives containing the divalent cations of Ni, Cu, and VO. Some of the results are illustrated here for VOPc.
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Fertaki, Stefani, Panagiota Giannoutsou et Malvina G. Orkoula. « Combining Raman Microspectroscopy and X-ray Microcomputed Tomography for the Study of Bone Quality in Apolipoprotein-Deficient Animal Models ». Molecules 28, no 20 (20 octobre 2023) : 7196. http://dx.doi.org/10.3390/molecules28207196.

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Raman microspectroscopy and X-ray microcomputed tomography (micro-CT) were used for assessment of the quality of the femur and tibia bones in apolipoprotein-deficient mice compared to control littermates. The cortical and trabecular bone was investigated separately. Raman spectra revealed no differences in the bioapatite-to-collagenous matrix ratio of the cortical bone. The quantities of calcium and collagen, which were measured using atomic absorption spectrometry and thermogravimetric analysis, respectively, were also found to be equal in the two groups. Density and morphometric parameters, which were measured using micro-CT, verified the cortical mineral stability. Bone quality indices were measured using Raman spectra. A decreased collagen crosslink (trivalent-to-divalent) ratio revealed delayed maturation of the collagen network. Such a decrease has been reported in the literature to be connected to decreased bone strength. For the trabecular bone, micro-CT revealed severe osteoporosis in the knock-out group, which was evident from a decreased mineral density, trabecular thickness and increased bone surface/volume ratio. The trabecular bone was not accessible for Raman spectroscopy. According to these results, the cortical and trabecular femur bone is expected to exhibit proneness to fracturing, each for a different reason. A combination of the two techniques was regarded as necessary for an overall assessment of bone quality.
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Li, Jiajia, Rongxi Li, Bangsheng Zhao, Ning Wang et Jinghua Cheng. « Quantitative analysis and measurement of carbon isotopic compositions in individual fluid inclusions by micro-laser Raman spectrometry ». Analytical Methods 8, no 37 (2016) : 6730–38. http://dx.doi.org/10.1039/c6ay01897a.

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Ramp, Kelsey K., Noah R. Dierckman, Margaret A. Sperry, Matthew E. Reuter, Yongan Tang, Gregory K. Webster et Patrick A. McVey. « Use of X-ray Microscopy for Confirmation of Crystallinity Detection in Amorphous Formulations by Electrospray Laser Desorption Ionization Mass Spectrometry Imaging ». Crystals 13, no 10 (24 septembre 2023) : 1418. http://dx.doi.org/10.3390/cryst13101418.

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The use of mass spectrometry imaging for crystallinity detection offers improved matrix selectivity and sensitivity over the techniques, such as X-ray microscopy and Raman spectrometry, that are traditionally used with this work. Crystallinity is observed in electrospray laser desorption ionization mass spectrometry imaging (ELDI-MSI) as a high-intensity agglomeration of the analyte in a spatially resolved image. As this is an indirect method of crystallinity detection, confirmation of this method’s ability to detect crystallization in amorphous formulations is needed by directly correlating observations of tablet crystallinity by ELDI-MSI to those of an established detection technique. Micro-computed tomography (micro-CT) has the necessary sensitivity for this investigation and is ideal for use in evaluating the correlation with crystallinity detection by ELDI-MSI. In this work, micro-CT followed by ELDI-MSI, in the same location on tablets of amorphous formulations of miconazole spiked with trace levels of crystalline miconazole, were analyzed. Crystals detected by ELDI-MSI as an agglomeration spatially matched with the detected crystals but were chemically unidentified by micro-CT. The results of this correlation study and a conclusion about the effectiveness of ELDI-MSI as a complimentary technique to indirectly detect crystallinity in enabling formations of an amorphous API are presented.
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Potgieter-Vermaak, S. S., et R. Van Grieken. « Preliminary Evaluation of Micro-Raman Spectrometry for the Characterization of Individual Aerosol Particles ». Applied Spectroscopy 60, no 1 (janvier 2006) : 39–47. http://dx.doi.org/10.1366/000370206775382848.

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LIU, YANDE, YU SHI, LIJUN CAI, YONG HAO et CHUNJIANG ZHAO. « DETERMINATION OF COPPER, ZINC, CADMIUM AND LEAD IN WATER USING CO-PRECIPITATION METHOD AND RAMAN SPECTROSCOPY ». Journal of Innovative Optical Health Sciences 06, no 03 (juillet 2013) : 1350021. http://dx.doi.org/10.1142/s1793545813500211.

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Mn co-precipitation method combined with Raman spectroscopy were used to determine trace heavy metals (copper, zinc, cadmium and lead) in water sample. Different concentrations of heavy metals including copper, zinc, cadmium and lead in water samples were separated and enriched by Mn 2+-phen-SCN- ternary complex co-precipitation procedure. The Raman spectra of co-precipitation sediments were collected using confocal micro-Raman spectrometry. Different preprocessing treatments and regression calibration methods were compared. The best models using partial least squares regression (PLS) of copper, zinc, cadmium and lead were built with a correlation coefficient of prediction (Rp) of 0.979, 0.964, 0.956 and 0.972, respectively, and the root mean square error of prediction (RMSEP) of 6.587, 9.046, 9.998 and 7.751 μg/kg, respectively. The co-precipitation procedure combined with Raman spectroscopy method are feasible to detect the amount of heavy metals in water.
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19

Laughlin, Gary J., et Dean Golemis. « Inter/Micro 2022 — International Microscopy Conference ». Microscope 69, no 3 (2022) : 109–22. http://dx.doi.org/10.59082/ebiz6604.

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McCrone Research Institute in Chicago was pleased to hold the Inter/Micro international microscopy conference again on Sept. 20 – 23, 2022, after a two-year hiatus due to the Covid-19 pandemic. This 72nd annual gathering of professional and amateur microscopists featured research talks on the first two days, covering advancements in instrumentation, new techniques, and practical applications in various fields of microscopy and microanalysis. Speakers focused on light microscopy, SEM, TEM, EDS, microspectrophotometry, electron backscatter diffraction, ultra-high-performance liquid chromatography coupled with high-resolution mass spectrometry, μ-Raman and FTIR spectroscopy, microchemistry, forensic trace evidence, and materials analysis.
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Xu, Bo, Guanyu Kou, Barbara Etschmann, Daiyue Liu et Joël Brugger. « Spectroscopic, Raman, EMPA, Micro-XRF and Micro-XANES Analyses of Sulphur Concentration and Oxidation State of Natural Apatite Crystals ». Crystals 10, no 11 (12 novembre 2020) : 1032. http://dx.doi.org/10.3390/cryst10111032.

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Sulphur is the third most abundant volatile element in deep Earth systems. Analytical methods for accurately and efficiently determining the sulphur content and oxidation state in natural minerals are still lacking. Natural apatite is widely distributed in the Earth and incorporates a large amount of sulphur. Therefore, apatite is an ideal mineral for performing sulphur measurements. Here, we used spectroscopic, Raman, X-ray diffraction, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), electron microprobe (EMPA) and micro-X-ray fluorescence spectrometry (micro-XRF) analysis techniques and developed a new analytical approach (i.e., micro-X-ray absorption near-edge structure (micro-XANES) analysis of the sulphur K-edge) to investigate the chemical characteristics of natural apatite. These multiple methods were developed to measure in situ sulphur concentration and S oxidation states and to assess a potential natural apatite reference material. Apatite contains chemically homogeneous sulphur, with micro-XANES located at the peak energies corresponding to S6+ (sulphate; ~2482 eV), S4+ (sulfite; ~2478 eV), and S2− (sulphide; ~2467, 2470 and 2474 eV). The Durango apatite contains total S presented as SO3 at amount of 0.332 ± 0.012 wt.% (1σ), with a large amount of S6+ and a small contribution of S4+. The Kovdor apatite contains 44–100 ppm of S and is dominated by S6+. These results indicate that the Durango apatite crystallised under relative oxidising conditions, and the Kovdor apatite has a higher oxygen fugacity than Durango. In addition, this study indicates the potential use of the natural apatite reference material with its S composition and S oxidation state.
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Wang, Zaibin, Xufeng Wang, Can Hu, Tida Ge, Long Wang, Jianfei Xing, Xiaowei He et Yachuan Zhao. « Comparative Evaluation of Analytical Techniques for Quantifying and Characterizing Polyethylene Microplastics in Farmland Soil Samples ». Agriculture 14, no 4 (31 mars 2024) : 554. http://dx.doi.org/10.3390/agriculture14040554.

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The presence of microplastics in soil has become a significant global concern, posing a threat to environmental, agricultural, and human health. However, the use of various detection methods has led to significant discrepancies in the statistics reported for the abundance of soil microplastics across the available literature, resulting in poor comparability across the available literature. Studies have shown that plastic film residue is among the main primary sources of microplastics in farmland soils. Therefore, we manufactured and selected polyethylene microplastics (PE-MPs) from plastic film and combined them with soil samples after density separation treatment, forming a spiked test soil sample, which was subjected to density separation and extraction using a ZnCl2 solution. The experiment used visual inspection by stereo microscopy, micro-Fourier transform infrared spectroscopy, micro-Raman spectrometry, laser direct infrared imaging, and pyrolysis-gas chromatography–mass spectroscopy for the quantitative analysis of spiked soil. This study systematically assessed and compared these five common soil microplastic detection methods. The results revealed different quantitative detection accuracies across various particle size ranges. Micro-Fourier transform infrared spectroscopy showed a broader applicable particle size range (20–5000 μm) and higher detection rate (91%), while the detection range (>50 μm) and rate (70%) of visual inspection through stereo microscopy were lower. For the identification of microplastic morphology, laser direct infrared imaging performed better, whereas micro-Fourier transform infrared spectroscopy had the advantage in determining the types of polymers present over micro-Raman spectrometry. The advantages, disadvantages, and detection rates of the above five detection methods were clarified during the detection process. Considering these findings and similar studies, we suggest three combinations of the evaluated methods to optimize the detection of PE-MPs.
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ZHU, Tong, YingJun LIU, DeFeng ZHAO, ZeFeng ZHANG et Qi CHEN. « Raman micro-spectrometry as a technique for investigating heterogeneous reactions on individual atmospheric particles ». SCIENTIA SINICA Chimica 40, no 12 (1 décembre 2010) : 1741–48. http://dx.doi.org/10.1360/zb2010-40-12-1741.

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Mozharov, Sergey, Alison Nordon, John M. Girkin et David Littlejohn. « Non-invasive analysis in micro-reactors using Raman spectrometry with a specially designed probe ». Lab on a Chip 10, no 16 (2010) : 2101. http://dx.doi.org/10.1039/c004248j.

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Dao, Nguyen Quy, et L. Delaigue. « Raman micro-spectrometry and its applications to the identification of inclusions in natural rubies ». Analusis 28, no 1 (janvier 2000) : 34–38. http://dx.doi.org/10.1051/analusis:2000280034.

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Zhao, DeFeng, Tong Zhu, Qi Chen, YingJun Liu et ZeFeng Zhang. « Raman micro-spectrometry as a technique for investigating heterogeneous reactions on individual atmospheric particles ». Science China Chemistry 54, no 1 (janvier 2011) : 154–60. http://dx.doi.org/10.1007/s11426-010-4182-x.

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Guendouz, M., M. Kloul, S. Haesaert, P. Joubert, J.-F. Bardeau et A. Bulou. « Oxidised porous silicon/disperse red 1 composite material : fabrication and micro-Raman spectrometry analysis ». physica status solidi (c) 2, no 9 (juin 2005) : 3453–56. http://dx.doi.org/10.1002/pssc.200461218.

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Su, Chun Hsi, et Chia Min Huang. « Effect of Zinc Oxide Films on Si Substrates Growth by Microwave Plasma Jet Sintering System ». Journal of Nano Research 22 (mai 2013) : 1–8. http://dx.doi.org/10.4028/www.scientific.net/jnanor.22.1.

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Microwave plasma techniques offered many advantages over conventional fabricating methods. However, few studies have used microwave plasma energy to sinter traditional ceramics. Thus, the aim of this work is microwave plasma Jet sintering system (MPJSS) and simulate analyze the electric field of ZnO films on Si (100) substrates. Ansoft HFSS consists of MPJSS modules for the calculation of ZnO films electromagnetic field. Sinter of ZnO films occurs at approximately N2 with a 10 sccm gas flow rate for a process pressure of 35 Torr and several power of 300W, 600W, 900W and 1200W applied power. Optical emission spectroscopic (OES) studies of N2 microwave plasmas, X-ray diffraction (XRD), Micro-Raman, and FESEM spectrometry were used to characterize the produced ZnO films. The results of XRD and Micro-Raman showed that the synthesized ZnO films had a high crystalline wurzite structure. The Zn2SiO4 peaks reveal an increase of the crystals dimensions with the increase of the E-field. Intensity of diffraction peak of ZnO films increases with increasing microwave powers in MPJSS.
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Caridi, Francesco, Michela Ricca, Giuseppe Paladini, Vincenza Crupi, Domenico Majolino, Antonio Donato, Sante Guido et al. « Multi-Technique Diagnostic Investigation in View of the Restoration of “The Glory of St. Barbara” Painting by Mattia Preti ». Applied Sciences 12, no 3 (27 janvier 2022) : 1385. http://dx.doi.org/10.3390/app12031385.

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The present paper illustrates the results of a diagnostic investigation performed on the oil on canvas painting “The Glory of St. Barbara” (1680–1688) by Mattia Preti. The painting is located inside the St. Barbara Church in Taverna (Catanzaro, Italy), the city that gave birth to the artist. In situ, non-invasive studies, by applying X-ray fluorescence (XRF) spectroscopy, along with laboratory micro-destructive analytical investigations, by employing electron probe microanalyses (EPMA) coupled with energy-dispersive spectrometry (EDS) and micro-Raman (µ-Raman) spectroscopy, were combined to retrieve the color palette and identify the painting technique and style of the famous master. As a result of this multi-scale characterization, an extraordinary pictorial technique was revealed, enriching knowledge about one of the oldest pictorial traditions outlined by Mattia Preti, and solving doubts still existing about many of his investigated artworks. Moreover, the achieved results represent useful and essential tools to address management issues of the artwork, by providing valuable information for planning and monitoring future restoration interventions of the canvas.
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Liu, Yande, et Changlan Wan. « Confocal Micro-Raman Spectrometry Determination of Multi-Pesticide Formulations Using Least-Squares Support Vector Regression ». Sensor Letters 11, no 6 (1 juin 2013) : 1378–82. http://dx.doi.org/10.1166/sl.2013.2867.

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Delorme, F., J. F. Bardeau, C. Harnois et I. Monot-Laffez. « Evidence of oxygen content heterogeneity in TSMTG YBa2Cu3O7−δ/Y2BaCuO5 composites by micro-Raman spectrometry ». Physica C : Superconductivity 468, no 5 (mars 2008) : 388–93. http://dx.doi.org/10.1016/j.physc.2007.12.006.

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Koralay, Tamer, et Yusuf Kagan Kadioglu. « Reasons of different colors in the ignimbrite lithology : Micro-XRF and confocal Raman spectrometry method ». Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy 69, no 3 (mars 2008) : 947–55. http://dx.doi.org/10.1016/j.saa.2007.05.063.

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Buzatu, Andrei, Gheorghe Damian, Nicolae Buzgar, Peter Andráš, Andrei Ionut Apopei, Andreea Elena Maftei et Stanislava Milovská. « Structural key features of bismuth and Sb-As sulfosalts from hydrothermal deposits—micro-Raman spectrometry ». Vibrational Spectroscopy 89 (mars 2017) : 49–56. http://dx.doi.org/10.1016/j.vibspec.2017.01.002.

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Hermon, H., M. Roth, M. Schieber et J. Shamir. « Determination of micro amounts of mercury(I) iodide in mercury(II) iodide by Raman spectrometry ». Vibrational Spectroscopy 2, no 2-3 (novembre 1991) : 155–59. http://dx.doi.org/10.1016/0924-2031(91)85021-e.

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Hagiwara, Yuuki, Yuya Sogo, Kohei Takahata et Junji Yamamoto. « Temperature dependence of CO2 densimetry using micro-Raman Spectrometry at laboratory conditions ». GEOCHEMICAL JOURNAL 52, no 4 (31 juillet 2018) : 379–83. http://dx.doi.org/10.2343/geochemj.2.0523.

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Yokokura, Lena, Yuuki Hagiwara et Junji Yamamoto. « Pressure dependence of micro‐Raman mass spectrometry for carbon isotopic composition of carbon dioxide fluid ». Journal of Raman Spectroscopy 51, no 6 (2 mars 2020) : 997–1002. http://dx.doi.org/10.1002/jrs.5864.

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Duan, Hongying, Liang Qu, Xiaolin Cheng, Yan Su, Aiguo Shen et Shiwei Wang. « Study of Cloisonné enamel glaze of decorative components from Fuwangge in the Forbidden City by means of LA-ICP-MS and micro-Raman Spectroscopy ». MRS Proceedings 1656 (21 août 2014) : 187–98. http://dx.doi.org/10.1557/opl.2014.663.

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ABSTRACTTwo Cloisonné enamel architectural components from Fuwangge in the Forbidden City that were produced from Yangzhou (one production center) in Qing Dynasty (1616-1911 A.D.) were chosen and analyzed. A combination of Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and micro-Raman spectroscopy was successfully used to analyze eight colors in enamel glazes (yellow, white, pink, turquoise, yellow green, deep blue, red and deep green). Chemical composition results reveal that the enamel glaze matrix belongs to lead-potash-lime glass (PbO-K2O-CaO-SiO2). Based on Raman spectroscopy, lead-tin yellow types II, cassiterite, lead arsenate, fluorite and hematite were found as opacifiers and/or colorants. In addition, a detailed discussion of raw materials, such as fluorite and borax, might provide valuable information to trace manufacturing technology and provenance.
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Amadori, Maria Letizia, Valeria Mengacci, Manuela Vagnini, Antonella Casoli, Parviz Holakooei, Negar Eftekhari, Kyi Lin, Yoshifumi Maekawa et Giulia Germinario. « Organic Matter and Pigments in the Wall Paintings of Me-Taw-Ya Temple in Bagan Valley, Myanmar ». Applied Sciences 11, no 23 (2 décembre 2021) : 11441. http://dx.doi.org/10.3390/app112311441.

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Pagán is an ancient city located in Myanmar that is renowned for the remains of about 4000 pagodas, stupas, temples and monasteries dating from the 11th to 13th centuries. Due to a magnitude 6.8 earthquake in 2016, more than 300 ancient buildings were seriously damaged. As a part of the post-earthquake emergency program, a diagnostic pilot project was carried out on Me-taw-ya temple wall paintings to acquire further information on the materials and on their state of conservation. This article presents our attempts at characterising the painting materials at Me-taw-ya temple using non-invasive portable energy dispersive X-ray fluorescence (ED-XRF), portable Raman spectroscopy and micro-invasive attenuated total reflectance—Fourier transform infrared spectroscopy (ATR-FTIR), micro-Raman spectroscopy (µ-Raman), gas chromatography-mass spectrometry (GC-MS), polarized light microscopy (PLM) and environmental scanning electron microscope—X-ray energy dispersive system (ESEM-EDS) investigations with the aim of identifying the composition of organic binders and pigments. The presence of a proteinaceous glue mixed with the lime-based plaster was ascertained and identified by GC-MS. In addition, this technique confirmed the occurrence of plant-derived gums as binders pointing to the a secco technique. Fe-based compounds, vermillion, carbon black and As-compounds were identified to have been incorporated in the palette of the murals.
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Sabatini, Francesca, Jacopo La Nasa, Ilaria Degano, Beatrice Campanella, Stefano Legnaioli, Ilaria Saccani et Francesca Modugno. « Fluorescent Paints in Contemporary Murals : A Case Study ». Heritage 6, no 8 (3 août 2023) : 5689–99. http://dx.doi.org/10.3390/heritage6080299.

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Recently, a notable change has occurred in how street art murals are perceived by art history and the general public, with a growing recognition of their social and cultural significance and a new focus on preserving the most representative modern urban murals for future generations. An interesting case study is constituted by the “UBUNTU” mural (Ivan Pontevia and Daniele Castagnetti, Reggio Emilia, 2018), whose appearance has radically changed in a few years. Indeed, the intense and direct exposure to sunlight as well as the environmental and polluting agents have induced the bleaching and fading of the original highly fluorescent hues. To investigate the degradation processes that are occurring, five micro-samples were collected from different fluorescent-coloured areas and analysed by a combined approach based on µ-Raman and Surface Enhanced Raman Spectroscopy (SERS), High Performance Liquid Chromatography coupled with Diode Array Detector and mass spectrometry (HPLC-DAD and HPLC-MS), and Pyrolysis Gas Chromatography coupled with Mass Spectrometry (Py-GC-MS). The analytical protocol applied allowed us to disclose the painting materials used by the artist and fully characterise the ageing phenomena occurring in the mural that are possibly responsible for its colour ephemerality.
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Szabó, Ondrej, Soňa Flickyngerová, Teodora Ignat, Ivan Novotný et Vladimír Tvarozek. « Gold nanostructures sputtered on zinc oxide thin film and corning glass substrates ». Facta universitatis - series : Electronics and Energetics 29, no 1 (2016) : 77–88. http://dx.doi.org/10.2298/fuee1601077s.

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Forming of Au nanostructures on Corning glass substrates and transparent conductive oxide ZnO:Al thin films by the RF diode sequential sputtering is presented. The morphology of Au structures was analysed by scanning electron microscopy (SEM) with the free ImageJ software, the optical properties were evaluated by UV-Vis spectrometry and micro-Raman spectroscopy. The sputtering power density (deposition rate) and nominal Au thickness caused changes in the sizes (10 - 1000 nm2) and nearest neighbour NN distances (4 - 40 nm) of Au nanostructures. The morphology of nanostructures exhibited the LogNormal distribution of the size of nanostructures. The lowest sputtering power density/deposition rate (9 mW/mm2/0.12 nm s-1) was optimal to get both the high optical transparency and a superior activity surface-enhanced Raman scattering of 11-mercaptoundecanoic acid adsorbed on the Au/ZnO:Al film.
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Pagliari, Francesca, Elisa Sogne, Davide Panella, Gerardo Perozziello, Carlo Liberale, Gobind Das, Alice Turdo et al. « Correlative Raman–Electron–Light (CREL) Microscopy Analysis of Lipid Droplets in Melanoma Cancer Stem Cells ». Biosensors 12, no 12 (1 décembre 2022) : 1102. http://dx.doi.org/10.3390/bios12121102.

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Among all neoplasms, melanoma is characterized by a very high percentage of cancer stem cells (CSCs). Several markers have been proposed for their identification, and lipid droplets (LDs) are among them. Different techniques are used for their characterization such as mass spectrometry, imaging techniques, and vibrational spectroscopies. Some emerging experimental approaches for the study of LDs are represented by correlative light–electron microscopy and by correlative Raman imaging–scanning electron microscopy (SEM). Based on these scientific approaches, we developed a novel methodology (CREL) by combining Raman micro-spectroscopy, confocal fluorescence microscopy, and SEM coupled with an energy-dispersive X-ray spectroscopy module. This procedure correlated cellular morphology, chemical properties, and spatial distribution from the same region of interest, and in this work, we presented the application of CREL for the analysis of LDs within patient-derived melanoma CSCs (MCSCs).
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Caner, Evin, et Bilge Alp Güney. « Characterization of ceramic ware fragments from Aizanoi-Turkey by micro Raman, XRPD and SEM-EDX spectrometry ». Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy 177 (avril 2017) : 135–39. http://dx.doi.org/10.1016/j.saa.2017.01.052.

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Jolivet, Aurélie, Ronan Fablet, Jean-François Bardeau et Hélène de Pontual. « Preparation techniques alter the mineral and organic fractions of fish otoliths : insights using Raman micro-spectrometry ». Analytical and Bioanalytical Chemistry 405, no 14 (19 mars 2013) : 4787–98. http://dx.doi.org/10.1007/s00216-013-6893-2.

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Haddad, Abed, et Corina E. Rogge. « Is There an International Klein Pink ? » Colorants 2, no 2 (25 avril 2023) : 194–208. http://dx.doi.org/10.3390/colorants2020013.

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Yves Klein (1928–1962) is best known for his intensely blue monochromatic works made with International Klein Blue (IKB), a synthetic ultramarine blue pigment bound in a poly(vinyl acetate) binder. However, he also made monochromes in other colors, including red and pink, the pigments of which have never been elucidated. Analysis of one sculpture, three paintings, and one screenprint by micro-Fourier transform infrared spectroscopy (µ-FTIR), Raman and surface-enhanced Raman (SERS) spectroscopies, portable X-ray fluorescence spectroscopy (p-XRF), and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectrometry (EDX), revealed that Klein used, knowingly or unknowingly, a variety of pink and red pigments, including Para Red, rhodamine 6G, rhodamine B, eosin Y, and alizarin lakes. The unexpected variety of pigments contrasts with his use of a single blue pigment and suggests he may not have held a singular vision of what constituted an iconic red or pink color.
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Kim, Seul-Ki, Hajun Kim, Hyun Sik Kim, Tae Eun Hong, Younki Lee et Eun Young Jung. « Characteristics of the Discoloration Switching Phenomenon of 4H-SiC Single Crystals Grown by PVT Method Using ToF-SIMS and Micro-Raman Analysis ». Materials 17, no 5 (22 février 2024) : 1005. http://dx.doi.org/10.3390/ma17051005.

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The discoloration switching appearing in the initial and final growth stages of 4H-silicon carbide (4H-SiC) single crystals grown using the physical vapor transport (PVT) technique was investigated. This phenomenon was studied, investigating the correlation with linear-type micro-pipe defects on the surface of 4H-SiC single crystals. Based on the experimental results obtained using time-of-flight secondary ion mass spectrometry (ToF-SIMS) and micro-Raman analysis, it was deduced that the orientation of the 4H-SiC c-axis causes an axial change that correlates with low levels of carbon. In addition, it was confirmed that the incorporation of additional elements and the concentrations of these doped impurity elements were the main causes of discoloration and changes in growth orientation. Overall, this work provides guidelines for evaluating the discoloration switching in 4H-SiC single crystals and contributes to a greater understanding of this phenomenon.
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Jiang, Baozhen, Kotaro Doi et Koichi Tsuchiya. « The Constituent Phases and Micromechanical Properties of Steel Corrosion Layers Generated by Hyperbaric-Oxygen Accelerated Corrosion Test ». Materials 16, no 13 (22 juin 2023) : 4521. http://dx.doi.org/10.3390/ma16134521.

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Hyperbaric oxygen-accelerated corrosion testing (HOACT) is a newly developed method to study in the labor the corrosion behavior of steel bars in concrete. This work aimed to intensively investigate the mechanical properties and microstructures of HOACT-generated corrosion products by means of nano-indentation tests, Raman micro-spectrometry, and scanning electron microscopy. The local elastic modulus and nanohardness varied over wide ranges of 6.8–75.2 GPa and 0.38–4.44 GPa, respectively. Goethite, lepidocrocite, maghemite, magnetite, and akageneite phases were identified in the corrosion products. Most regions of the rust layer were composed of a complex and heterogeneous mix of different phases, while some regions were composed of maghemite or akageneite only. The relationship between the micromechanical properties and typical microstructural features is finally discussed at the micro-scale level. It was found that the porosity of corrosion products can significantly influence their micromechanical properties.
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Valadas, Sara, Rita V. Freire, Ana Cardoso, José Mirão, Cristina B. Dias, Peter Vandenabeele et António Candeias. « On the Use of the Unusual Green Pigment Brochantite (Cu4(SO4)(OH)6) in the 16th-Century Portuguese-Flemish Paintings Attributed to The Master Frei Carlos Workshop ». Microscopy and Microanalysis 21, no 2 (23 février 2015) : 518–25. http://dx.doi.org/10.1017/s1431927615000094.

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AbstractThis paper reports an unusual green pigment, brochantite (Cu4(SO4)(OH)6), on 16th-century Portuguese-Flemish paintings, attributed to the Master Frei Carlos workshop. This green mineral is usually identified as an impurity or alteration product in the green pigments verdigris (Cu(CH3COO)2nCu(OH)2) or malachite (CuCO3 Cu(OH)2). However, after thorough investigation with a broad range of analytical techniques, it became clear that, in this case, brochantite was applied as a pigment. The abundance, pigment granulometry, and pigment morphology suggest intentional use by this Portuguese-Flemish Master as a natural pigment rather than its accidental use as an alteration product. This seems to be a distinguishable feature to other painters (Flemish and Portuguese) working in Portugal at the beginning of the 16th century.The multi-analytical study of these easel paintings was first performed by physical imaging techniques and material characterization was carried out by optical microscopy, micro-Fourier-transform infrared-spectroscopy, micro-Raman spectroscopy, scanning electron microscopy coupled with energy dispersive X-ray spectrometry, and micro-X-ray diffraction analysis (XRD).
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Šefců, Radka, Štěpánka Chlumská, Václava Antušková, Daniel Vavřík, Ivana Kumpová et Václav Pitthard. « A Multianalytical Approach for the Characterisation of Materials on Selected Artworks by Monogrammist IP ». Materials 16, no 1 (29 décembre 2022) : 331. http://dx.doi.org/10.3390/ma16010331.

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This paper presents an investigation of wooden artworks from the collection of the National Gallery Prague created by Monogrammist IP–one of the top carvers of the Salzburg-Passau region at the beginning of the 16th century. His wood reliefs were examined to gain a better understanding of the historical techniques used in medieval art workshops. The internal structure of the small relief Visitation was analysed using computed tomography. Tomographic reconstruction made it possible to distinguish wood species, observe the internal structure of the artwork in detail, study the technological procedures and identify earlier repairs, additions and damages. Tomographic investigation proved the use of four types of wood on the relief Visitation, most likely pear, lime, unspecified softwood and other different species used for joining dowels. A combination of non-invasive and micro-destructive analytical techniques was employed for the chemical characterisation of the materials in the surface layers of the artworks. Photomicrographs of the surface were taken to provide material for the initial investigation. Non-invasive material research was conducted using a portable X-ray fluorescence analyser and, in selected cases, an external reflection infrared spectrometer. The detailed analyses on the micro-samples was carried out by optical microscopy, micro-Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy coupled with energy dispersive X-ray spectrometry and gas chromatography with mass spectrometry. A glaze layer based on protein with earth pigment was identified on the relief Christ the Saviour from Death.
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Mansfield, Jessica Claire, et C. Peter Winlove. « Lipid distribution, composition and uptake in bovine articular cartilage studied using Raman micro-spectrometry and confocal microscopy ». Journal of Anatomy 231, no 1 (16 mai 2017) : 156–66. http://dx.doi.org/10.1111/joa.12624.

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Stefaniak, E. A., A. Buczynska, V. Novakovic, R. Kuduk et R. Van Grieken. « Determination of chemical composition of individual airborne particles by SEM/EDX and micro-Raman spectrometry : A review ». Journal of Physics : Conference Series 162 (1 avril 2009) : 012019. http://dx.doi.org/10.1088/1742-6596/162/1/012019.

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Worobiec, Anna, Sanja Potgieter-Vermaak, Alan Brooker, Larysa Darchuk, Elzbieta Stefaniak et Rene Van Grieken. « Interfaced SEM/EDX and micro-Raman Spectrometry for characterisation of heterogeneous environmental particles — Fundamental and practical challenges ». Microchemical Journal 94, no 1 (janvier 2010) : 65–72. http://dx.doi.org/10.1016/j.microc.2009.09.003.

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