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Literatura académica sobre el tema "Raman micro-Spectrometry"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Raman micro-Spectrometry"

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

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Adar, F., B. Lenain, D. C. Cook, and S. J. Oh. "Corrosion Product Identification by Micro-Raman and Mossbauer Spectroscopy." Microscopy and Microanalysis 4, S2 (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, and 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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Liu, Yande, and 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 (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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Yomogida, T., F. Esaka, and 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, and G. Turrell. "The Effect of High-Numerical-Aperture Objectives on Polarization Measurements in Micro-Raman Spectrometry." Applied Spectroscopy 39, no. 6 (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, et al. "Quantification and handling of nonlinearity in Raman micro-spectrometry of pharmaceuticals." Journal of Pharmaceutical and Biomedical Analysis 128 (September 2016): 236–46. http://dx.doi.org/10.1016/j.jpba.2016.05.036.

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Arakawa, Masashi, Junji Yamamoto, and Hiroyuki Kagi. "Developing Micro-Raman Mass Spectrometry for Measuring Carbon Isotopic Composition of Carbon Dioxide." Applied Spectroscopy 61, no. 7 (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, and 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 (2004): 633–39. http://dx.doi.org/10.1002/jrs.1216.

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

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Tesis sobre el tema "Raman micro-Spectrometry"

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Potgieter-Vermaak, SS, RHM Godoi, Grieken R. Van, JH Potgieter, M. Oujja, and M. Castillejo. "Micro-structural characterization of black crust and laser cleaning of building stones by micro-Raman and SEM techniques." Elsevier, 2005. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000992.

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Research concerning the formation and removal of black crusts on various historical objects is approached from many different angles. The so-called “yellowing effect”, observed after laser treatment for cleaning purposes, has also received a lot of attention. Evidence regarding this phenomenon differs considerably and the actual mechanisms are still speculated on by researchers. In an attempt to elucidate the processes involved in the yellowing effect associated with laser cleaning, a new analytical technique has been used to investigate the black crust, a region of the sample cleaned by laser irradiation at 1064 nm and another region of the same sample subjected to further laser irradiation at 355 nm, on a limestone sample from the cathedral of Seville in Spain. Micro-Raman spectrometry offers the advantage of spatial chemical characterization of the stone, based upon its molecular makeup and was performed on the bulk body of the stone. Raman and scanning electron microscopy/energy dispersive X-ray spectrometry (SEM/EDXS) results indicate that the surfaces cleaned by irradiation at 1064 nm and by double irradiation at 1064 and 355 nm differed in terms of their calcium sulphate, calcium oxalate and iron oxide content, and that this could contribute to the difference in colour observed.

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Sader, Mikel. "Photoréactivité et comportement de phases des particules d'intérêt atmosphérique : étude à l'échelle de la particule individuelle en lévitation." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDSMRE/2023/2023ULILR086.pdf.

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Les particules atmosphériques jouent un rôle important dans les phénomènes du changement climatique. Elles modifient les propriétés microphysiques des nuages, et par conséquence leurs propriétés optiques, leur proportion, et leur temps de vie. Les océans sont la principale source d'aérosols naturels dans l'atmosphère. La composition de ces aérosols est complexe, et les particules fraichement émises reflètent la composition de l'eau de mer dont elles sont issues. Par ailleurs, l'activité biologique marine enrichit dans une certaine mesure ces aérosols en matière organique. La composition de ces particules évolue dans l'atmosphère marine polluée et au cours du vieillissement lors du transport dans l'atmosphère par interactions avec la lumière solaire et l'exposition aux gaz atmosphériques, à d'autres particules et à l'humidité, modifiant leurs caractéristiques physico-chimiques. L'étude approfondie des particules en laboratoire est d'une importance cruciale pour comprendre les processus physicochimiques des aérosols dans l'atmosphère.Dans cette thèse, nous avons étudié le comportement de phases et la photodégradation d'aérosols formés à partir de mélanges internes de composés organiques et inorganiques analogues aux espèces trouvées dans les aérosols marins frais et pollués par des émissions anthropiques. Les études ont été réalisées sur des particules individuelles en suspension dans l'air et déposées sur des substrats hydrophobes. La technique de micro-spectrométrie Raman couplée à une chambre de lévitation acoustique a été fondamentale pour la compréhension in-situ de l'état de mélange des particules lors de leur exposition à la lumière et à l'humidité, grâce à l'obtention de spectres résolus spatialement. La photolyse directe des particules d'acide malonique en lévitation, en l'absence d'un oxydant a été démontrée, ainsi que l'effet de la présence du sel NaCl sur les produits de photodégradation. L'impact des photoproduits sur les propriétés d'hygroscopicité des particules a également été mis en évidence. Des études réalisées sur des gouttelettes complexes contenant un oligomère, du sulfate d'ammonium et de l'acide glycolique ont révélé la coexistence de trois phases liquides dans la gouttelette, ainsi que la cristallisation prématurée du sel inorganique à une humidité relative élevée. L'effet de la lumière UV-Visible sur les propriétés d'hygroscopicité et la séparation de phases des particules en lévitation a été démontré<br>Atmospheric particles play a significant role in climate change. They modify the microphysical properties of clouds, and consequently their optical properties, their proportion, and their lifetime. The oceans are the main source of natural aerosols in the atmosphere. The composition of these aerosols is complex, and freshly emitted particles reflect the composition of the seawater from which they originate. In addition, marine biological activity enriches these aerosols to some extent with organic matter. The composition of these particles evolves in the polluted marine atmosphere and during aging as they travel through the atmosphere, by interactions with sunlight and exposure to atmospheric gases, other particles, and humidity, modifying their physicochemical characteristics. In depth-study of particles in the laboratory is of crucial importance for understanding the physicochemical processes of aerosols in the atmosphere.In this thesis, we studied the phase behavior and photodegradation of aerosols formed from internal mixtures of organic and inorganic compounds analogous to the species found in fresh and polluted marine aerosols from anthropogenic emissions. The studies were conducted on individual particles suspended in air and deposited on hydrophobic substrates. The Raman micro-spectrometry technique coupled to an acoustic levitation chamber was fundamental for understanding in-situ the state of mixing of the particles during their exposure to light and humidity, through the acquisition of spatially resolved spectra. The direct photolysis of malonic acid particles in levitation, in the absence of an oxidant, has been demonstrated, as well as the effect of the presence of NaCl salt on the photodegradation products. The impact of the photoproducts on the hygroscopic properties of the particles has also been highlighted. Studies carried out on complex droplets containing an oligomer, ammonium sulfate, and glycolic acid revealed the coexistence of three liquid phases in the droplet, as well as the premature crystallization of the inorganic salt at high relative humidity. The effect of the UV-Visible light on the hygroscopic properties and the phase separation of levitated particles has been demonstrated

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Capítulos de libros sobre el tema "Raman micro-Spectrometry"

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Hunger, K., E. Hildbrand, V. Hubert, M. Wörle, A. R. Furger, and M. Wartmann. "Non-Destructive and Minimally Invasive Analyses of Bronze Seal Boxes from Augusta Raurica by Micro X-Ray Fluorescence Spectrometry, Raman Spectroscopy and FTIR Spectroscopy." In Proceedings of the 37th International Symposium on Archaeometry, 13th - 16th May 2008, Siena, Italy. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14678-7_87.

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Hale, Robert C., Meredith E. Seeley, Ashley E. King, and Lehuan H. Yu. "Analytical Chemistry of Plastic Debris: Sampling, Methods, and Instrumentation." In Microplastic in the Environment: Pattern and Process. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78627-4_2.

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AbstractApproaches for the collection and analysis of plastic debris in environmental matrices are rapidly evolving. Such plastics span a continuum of sizes, encompassing large (macro-), medium (micro-, typically defined as particles between 1 μm and 5 mm), and smaller (nano-) plastics. All are of environmental relevance. Particle sizes are dynamic. Large plastics may fragment over time, while smaller particles may agglomerate in the field. The diverse morphologies (fragment, fiber, sphere) and chemical compositions of microplastics further complicate their characterization. Fibers are of growing interest and present particular analytical challenges due to their narrow profiles. Compositional classes of emerging concern include tire wear, paint chips, semisynthetics (e.g., rayon), and bioplastics. Plastics commonly contain chemical additives and fillers, which may alter their toxicological potency, behavior (e.g., buoyancy), or detector response (e.g., yield fluorescence) during analysis. Field sampling methods often focus on >20 μm and even >300 μm sized particles and will thus not capture smaller microplastics (which may be most abundant and bioavailable). Analysis of a limited subgroup (selected polymer types, particle sizes, or shapes) of microplastics, while often operationally necessary, can result in an underestimation of actual sample content. These shortcomings complicate calls for toxicological studies of microplastics to be based on “environmentally relevant concentrations.” Sample matrices of interest include water (including wastewater, ice, snow), sediment (soil, dust, wastewater sludge), air, and biota. Properties of the environment, and of the particles themselves, may concentrate plastic debris in select zones (e.g., gyres, shorelines, polar ice, wastewater sludge). Sampling designs should consider such patchy distributions. Episodic releases due to weather and anthropogenic discharges should also be considered. While water grab samples and sieving are commonplace, novel techniques for microplastic isolation, such as continuous flow centrifugation, show promise. The abundance of nonplastic particulates (e.g., clay, detritus, biological material) in samples interferes with microplastic detection and characterization. Their removal is typically accomplished using a combination of gravity separation and oxidative digestion (including strong bases, peroxide, enzymes); unfortunately, aggressive treatments may damage more labile plastics. Microscope-based infrared or Raman detection is often applied to provide polymer chemistry and morphological data for individual microplastic particles. However, the sheer number of particles in many samples presents logistical hurdles. In response, instruments have been developed that employ detector arrays and rapid scanning lasers. The addition of dyes to stain particulates may facilitate spectroscopic detection of some polymer types. Most researchers provide microplastic data in the form of the abundances of polymer types within particle size, polymer, and morphology classes. Polymer mass data in samples remain rare but are essential to elucidating fate. Rather than characterizing individual particles in samples, solvent extraction (following initial sample prep, such as sediment size class sorting), combined with techniques such as thermoanalysis (e.g., pyrolysis), has been used to generate microplastic mass data. However, this may obviate the acquisition of individual particle morphology and compositional information. Alternatively, some techniques (e.g., electron and atomic force microscopy and matrix-assisted laser desorption mass spectrometry) are adept at providing highly detailed data on the size, morphology, composition, and surface chemistry of select particles. Ultimately, the analyst must select the approach best suited for their study goals. Robust quality control elements are also critical to evaluate the accuracy and precision of the sampling and analysis techniques. Further, improved efforts are required to assess and control possible sample contamination due to the ubiquitous distribution of microplastics, especially in indoor environments where samples are processed.

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Penel, G., G. Leroy, G. Cournot, and E. Brès. "Characterization of synthetic and biological calcium phosphate materials by micro-raman spectrometry." In Bioceramics. Elsevier, 1997. http://dx.doi.org/10.1016/b978-008042692-1/50135-7.

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4

Colomban, Philippe. "Potential and Drawbacks of Raman (Micro)spectrometry for the Understanding of Iron and Steel Corrosion." In New Trends and Developments in Automotive System Engineering. InTech, 2011. http://dx.doi.org/10.5772/13436.

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Actas de conferencias sobre el tema "Raman micro-Spectrometry"

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Mozharov, Sergey, Alison Nordon, John Girkin, and David Littlejohn. "Process analysis in micro-reactors: challenges and solutions with Raman spectrometry." In SPIE MOEMS-MEMS, edited by Holger Becker and Bonnie L. Gray. SPIE, 2011. http://dx.doi.org/10.1117/12.874227.

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De Biasio, M., M. Kraft, M. Roesner, et al. "Direct optical stress sensing in semiconductor manufacturing using Raman micro-spectrometry." In 2016 IEEE SENSORS. IEEE, 2016. http://dx.doi.org/10.1109/icsens.2016.7808575.

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ESSANI, Mouad. "INVESTIGATION OF THE COMPOSITION OF URANIUM MICROPARTICLES USING QUANTITATIVE EPMA AND MICRO-RAMAN SPECTROMETRY." In European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.1484.

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Yokokura, Lena, Yuuki Hagiwara, and Junji Yamamoto. "Pressure Dependence of micro-Raman Mass Spectrometry for Carbon Isotopic Composition of Carbon Dioxide Fluid." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.3031.

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Martin, P., R. Bisaro, C. Dua, et al. "Temperature Distributions in III-V and SiC Micro-Wave Power Transistors Using Spatially Resolved Photoluminescence and Raman-Spectrometry Mapping Respectively." In ISTFA 2000. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.istfa2000p0435.

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Abstract This paper describes a new method for the mapping of local temperatures in the active region of highpower III-V semiconductor transistors for microwave applications. The measurement technique involves scanning a focused laser beam at the surface of a chip inside its package, while the photoluminescence (PL) or the Raman spectra produced are recorded sequentially for each position of the laser beam. The local temperature is deduced either from the corresponding wavelength shift of the PL (which represents changes in the band-gap due to heating) or from Raman Stokes peak shift or from the Stokes to anti-Stokes intensity ratio (which correspond to changes in optical phonon frequencies and population respectively due to heating). Results are shown both for SiC-based field effect transistors and for bipolar type transistors (heterojunction bipolar transistors – HBTs – in the GaAs/Ga1-xInxP system). A spatial resolution of 1 µm and an accuracy in the temperature determination of ± 3 °C are demonstrated, especially for the HBTs. Finally, procedures are proposed to implement the information on local operating temperatures provided by this method into thermal resistance calculations.

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