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    2984 results match your criteria Applied spectroscopy[Journal]

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    Infrared Extinction Performance of Randomly Oriented Microbial-Clustered Agglomerate Materials.
    Appl Spectrosc 2017 Jan 1:3702817717475. Epub 2017 Jan 1.
    3 Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province, Hefei, Anhui, China.
    In this study, the spatial structure of randomly distributed clusters of fungi An0429 spores was simulated using a cluster aggregation (CCA) model, and the single scattering parameters of fungi An0429 spores were calculated using the discrete dipole approximation (DDA) method. The transmittance of 10.6 µm infrared (IR) light in the aggregated fungi An0429 spores swarm is simulated by using the Monte Carlo method. Read More

    Thermal Breakdown Kinetics of 1-Ethyl-3-Methylimidazolium Ethylsulfate Measured Using Quantitative Infrared Spectroscopy.
    Appl Spectrosc 2017 Jan 1:3702817727293. Epub 2017 Jan 1.
    1 Department of Mechanical Engineering, Colorado School of Mines, Golden, CO, USA.
    In this work, the thermal stability of the room temperature ionic liquid (RTIL) 1-ethyl-3-methylimidazolium ethylsulfate ([EMIM][EtSO4]) is investigated using infrared (IR) spectroscopy. Quantitative IR absorption spectral data are measured for heated [EMIM][EtSO4]. Spectra have been collected between 25 ℃ and 100 ℃ using a heated optical cell. Read More

    Origin of Analyte-Induced Porous Silicon Photoluminescence Quenching.
    Appl Spectrosc 2017 Sep 20;71(9):2136-2145. Epub 2017 Mar 20.
    2 Department of Chemistry, Natural Sciences Complex, SUNY-Buffalo, Buffalo, NY, USA.
    We report on gaseous analyte-induced photoluminescence (PL) quenching of porous silicon, as-prepared (ap-pSi) and oxidized (ox-pSi). By using steady-state and emission wavelength-dependent time-resolved intensity luminescence measurements in concert with a global analysis scheme, we find that the analyte-induced quenching is best described by a three-component static quenching model. In the model, there are blue, green, and red emitters (associated with the nanocrystallite core and surface trap states) that each exhibit unique analyte-emitter association constants and these association constants are a consequence of differences in the pSi surface chemistries. Read More

    The Effect of Moderate Temperatures on Latent Fingerprint Chemistry.
    Appl Spectrosc 2017 Sep 14;71(9):2102-2110. Epub 2017 Mar 14.
    Cranfield University, The Defence Academy of the United Kingdom, Shrivenham, UK.
    The effect of moderate temperatures (25-75 ℃) on latent fingerprints over a five-hour period was examined using Fourier transform infrared (FT-IR) microspectroscopy. The aim of the study was to detect changes in IR spectra due to any changes in fingerprint chemistry; these results were then compared to pure compounds found in sebum that was subjected to 75 ℃ for 5 h. Latent fingerprints deposited on CaF2 microscope slides and placed on a Peltier pump heating stage showed that higher temperatures significantly reduced the quantity of sebaceous compounds after 5 h, whereas temperatures below 45 ℃ had little effect on the quantity of these compounds over the same time period. Read More

    Random Forest-Based Evaluation of Raman Spectroscopy for Dengue Fever Analysis.
    Appl Spectrosc 2017 Sep 17;71(9):2111-2117. Epub 2017 Mar 17.
    1 Agri-biophotonics Laboratory, National Institute for Lasers & Optronics, Islamabad, Pakistan.
    This work presents the evaluation of Raman spectroscopy using random forest (RF) for the analysis of dengue fever in the infected human sera. A total of 100 dengue suspected blood samples, collected from Holy Family Hospital, Rawalpindi, Pakistan, have been used in this study. Out of these samples, 45 were dengue-positive based on immunoglobulin M (IgM) capture enzyme-linked immunosorbent assay (ELISA) tests. Read More

    Quantitative Micro-Raman Spectroscopy for Partial Pressure Measurement in Small Volumes.
    Appl Spectrosc 2017 Jan 1:3702817724410. Epub 2017 Jan 1.
    122364 CSEM (Centre Suisse d'Électronique et de Microtechnique) SA, Neuchâtel, Switzerland.
    We demonstrate the quantitative capabilities of Raman confocal microscopy as a nondestructive method to measure the partial pressure of molecular gases in mm(3) range sealed volume having an optical access. Thanks to a calibration procedure, we apply this technique for the characterization of the absolute nitrogen partial pressure inside buffered micro electromechanical system (MEMS) atomic vapor cells developed for atomic clocks. Our results are compared with measurements obtained by rubidium hyperfine frequency spectroscopy and a good agreement is demonstrated between the two methods, with a three-sigma detection limit below 10 mbar for a 1 h integration time, using a 33 mW 532 nm excitation laser. Read More

    Label-Free Raman Hyperspectral Imaging of Single Cells Cultured on Polymer Substrates.
    Appl Spectrosc 2017 Jan 1:3702817715042. Epub 2017 Jan 1.
    1 School of Physics and Astronomy, University of Nottingham, Nottingham, UK.
    While Raman hyperspectral imaging has been widely used for label-free mapping of biomolecules in cells, these measurements require the cells to be cultured on weakly Raman scattering substrates. However, many applications in biological sciences and engineering require the cells to be cultured on polymer substrates that often generate large Raman scattering signals. Here, we discuss the theoretical limits of the signal-to-noise ratio in the Raman spectra of cells in the presence of polymer signals and how optical aberrations may affect these measurements. Read More

    Multivariate Analysis of Mixed Lipid Aggregate Phase Transitions Monitored Using Raman Spectroscopy.
    Appl Spectrosc 2017 Jan 1:3702817729347. Epub 2017 Jan 1.
    Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, USA.
    The phase behavior of aqueous 1,2-dimyristoyl-sn-glycero-3-phosphorylcholine (DMPC)/1,2-dihexanoyl-sn-glycero-3-phosphocholine (DHPC) mixtures between 8.0 ℃ and 41.0 ℃ were monitored using Raman spectroscopy. Read More

    Vibrational Spectroscopy for the Determination of Ionizable Group Content in Ionomer Materials.
    Appl Spectrosc 2017 Jan 1:3702817728243. Epub 2017 Jan 1.
    2 Department of Chemistry, Clemson University, Hunter Laboratories, Clemson, SC, USA.
    An approach based on vibrational spectral measurements is described for determining the ionizable group content of ion conducting polymer membrane materials. Aimed at supporting the assessment of membrane stability and wear characteristics, performance is evaluated for attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy, confocal Raman microscopy, and ATR FT-IR microscopy using perfluorinated ionomer membrane standards. One set of ionomer standards contained a sulfonic acid ionizable group and the other a sulfonyl imide group. Read More

    Quantitative Analysis of Polyacrylamide Grafted on Polylactide Film Surfaces Employing Spectroscopic Techniques.
    Appl Spectrosc 2017 Jan 1:3702817727752. Epub 2017 Jan 1.
    School of Biochemical Engineering and Technology, Sirindhorn International Institute of Technology (SIIT), Thammasat University, Pathum Thani, 12121 Thailand.
    Standard techniques for quantitative measurement of polyacrylamide (PAm) contents grafted on polylactide (PLA) film substrates, P(LA- g-Am- co-MBAm), which are commonly used as cell culture substrates or scaffolds, and pH-sensitive absorbents have been developed with X-ray photoelectron (XPS), proton-nuclear magnetic resonance ((1)H-NMR), and Fourier transform infrared (FT-IR) spectroscopy. The techniques are then applied to examine P(LA- g-Am- co-MBAm) samples prepared from two separate photo-initiator/co-initiator systems. Efficiency and accuracy of the techniques are compared. Read More

    Toward a Noninvasive, Label-Free Screening Method for Determining Spore Inoculum Quality of Penicillium chrysogenum Using Raman Spectroscopy.
    Appl Spectrosc 2017 Jan 1:3702817727728. Epub 2017 Jan 1.
    1 Institute of Chemical Technologies and Analytics, TU Wien, Vienna, Austria.
    We report on a label-free, noninvasive method for determination of spore inoculum quality of Penicillium chrysogenum prior to cultivation/germination. Raman microspectroscopy providing direct, molecule-specific information was used to extract information on the viability state of spores sampled directly from the spore inoculum. Based on the recorded Raman spectra, a supervised classification method was established for classification between living and dead spores and thus determining spore inoculum quality for optimized process control. Read More

    Determination of Magnesium Oxide Content in Mineral Medicine Talcum Using Near-Infrared Spectroscopy Integrated with Support Vector Machine.
    Appl Spectrosc 2017 Jan 1:3702817727016. Epub 2017 Jan 1.
    1 Key Laboratory of Ministry of Education on Traditional Chinese Medicine Resource and Compound Prescription & Hubei University of Chinese Medicine, Wuhan, China.
    In this research paper, a fast, quantitative, analytical model for magnesium oxide (MgO) content in medicinal mineral talcum was explored based on near-infrared (NIR) spectroscopy. MgO content in each sample was determined by ethylenediaminetetraacetic acid (EDTA) titration and taken as reference value of NIR spectroscopy, and then a variety of processing methods of spectra data were compared to establish a good NIR spectroscopy model. To start, 50 batches of talcum samples were categorized into training set and test set using the Kennard-Stone (K-S) algorithm. Read More

    Determination of Depth in Transmission Raman Spectroscopy in Turbid Media Using a Beam Enhancing Element.
    Appl Spectrosc 2017 Aug 24;71(8):1849-1855. Epub 2017 Feb 24.
    3 Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell Oxford, UK.
    This study demonstrates experimentally a method to enable prediction of depth of a chemical species buried in a turbid medium by using transmission Raman spectroscopy alone. The method allows the prediction of the depth of a single, chemically distinct layer within a turbid matrix by performing two measurements, with and without a beam enhancing element, or "photon diode." The samples employed consisted of two different polymers, of total thickness 3. Read More

    Raman Microspectroscopic Mapping with Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS) Applied to the High-Pressure Polymorph of Titanium Dioxide, TiO2-II.
    Appl Spectrosc 2017 Aug 7;71(8):1816-1833. Epub 2017 Mar 7.
    1 Department of Chemistry & Biochemistry, University of Delaware, USA.
    The high-pressure, α-PbO2-structured polymorph of titanium dioxide (TiO2-II) was recently identified in micrometer-sized grains recovered from four Neoarchean spherule layers deposited between ∼2.65 and ∼2.54 billion years ago. Read More

    Implementation of Resonance Tracking for Assuring Reliability in Resonance Enhanced Photothermal Infrared Spectroscopy and Imaging.
    Appl Spectrosc 2017 Aug 14;71(8):2013-2020. Epub 2017 Mar 14.
    1 Institute for Chemical Technologies and Analytics, Technical University of Vienna, Vienna, Austria.
    Photothermal-induced resonance (PTIR) is a method for optical spectroscopy that allows for infrared (IR) chemical imaging at spatial resolution below the limit of diffraction. By using the mechanical resonance of the cantilever for amplification the technique has been shown to allow sensitivity down to single monolayers. In this work, we discuss the challenges that must be overcome for performing stable resonant PTIR measurements and how imprecise experimental procedures can lead to irreproducible or even erroneous results. Read More

    Hydrodemetallation and Hydrodesulfurization Spent Catalysts Elemental Analysis: Comparison of Wavelength Dispersive X-ray Fluorescence and Atomic Emission Spectrometries.
    Appl Spectrosc 2017 Aug 14;71(8):1884-1893. Epub 2017 Mar 14.
    1 Groupe Chimie et Electrochimie des Matériaux, Institut Jean Lamour, CNRS UMR 7198 - Université de Lorraine, Metz, Cedex 3, France.
    Petroleum industries continuously consume catalysts on very large scales. The recycling of spent catalysts is thus of major economic and environmental importance and its first step consists of the characterization of the valuable metal content. Wavelength dispersive X-ray fluorescence (WDXRF) analysis is compared with inductively coupled plasma atomic emission spectrometry (ICP-AES) for the analysis of five samples of spent hydrodesulphurization (HDS) and hydrodemetallization (HDM) catalysts. Read More

    Measurements of Strontium Levels in Human Bone In Vivo Using Portable X-ray Fluorescence (XRF).
    Appl Spectrosc 2017 Aug 2;71(8):1962-1968. Epub 2017 Mar 2.
    1 School of Health Sciences, Purdue University, West Lafayette, IN USA.
    Measurement of bone strontium (Sr) is vital to determining the effectiveness of Sr supplementation, which is commonly used for the treatment of osteoporosis. Previous technology uses radioisotope sources and bulky equipment to measure bone Sr. This study demonstrates the effectiveness of portable X-ray fluorescence (XRF) for bone Sr measurement and validates it using data from a population of 238 children. Read More

    Looking for Common Fingerprints in Leonardo's Pupils Using Nondestructive Pigment Characterization.
    Appl Spectrosc 2017 Aug 20;71(8):1915-1926. Epub 2017 Mar 20.
    2 Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca, Milan, Italy.
    Non-invasive, portable analytical techniques are becoming increasingly widespread for the study and conservation in the field of cultural heritage, proving that a good data handling, supported by a deep knowledge of the techniques themselves, and the right synergy can give surprisingly substantial results when using portable but reliable instrumentation. In this work, pigment characterization was carried out on 21 Leonardesque paintings applying in situ X-ray fluorescence (XRF) and fiber optic reflection spectroscopy (FORS) analyses. In-depth data evaluation allowed to get information on the color palette and the painting technique of the different artists and workshops . Read More

    Determination of Spatially Resolved Tablet Density and Hardness Using Near-Infrared Chemical Imaging (NIR-CI).
    Appl Spectrosc 2017 Aug 21;71(8):1906-1914. Epub 2017 Mar 21.
    1 Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA.
    Near-infrared chemical imaging (NIR-CI) combines spectroscopy with digital imaging, enabling spatially resolved analysis and characterization of pharmaceutical samples. Hardness and relative density are critical quality attributes (CQA) that affect tablet performance. Intra-sample density or hardness variability can reveal deficiencies in formulation design or the tableting process. Read More

    Optimal Regression Method for Near-Infrared Spectroscopic Evaluation of Articular Cartilage.
    Appl Spectrosc 2017 Jan 1:3702817726766. Epub 2017 Jan 1.
    1 Department of Applied Physics, University of Eastern Finland, Kuopio, Finland.
    Near-infrared (NIR) spectroscopy has been successful in nondestructive assessment of biological tissue properties, such as stiffness of articular cartilage, and is proposed to be used in clinical arthroscopies. Near-infrared spectroscopic data include absorbance values from a broad wavelength region resulting in a large number of contributing factors. This broad spectrum includes information from potentially noisy variables, which may contribute to errors during regression analysis. Read More

    Time-Resolved Vibrational Spectroscopy of Polytetrafluoroethylene Under Laser-Shock Compression.
    Appl Spectrosc 2017 Jan 1:3702817726542. Epub 2017 Jan 1.
    1 High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai, India.
    Shock-wave-induced high pressure and nanosecond time-resolved Raman spectroscopic experiments were performed to examine the dynamic response of polytetrafluoroethylene (PTFE) in confinement geometry targets. Time-resolved Raman spectroscopy was used to observe the pressure-induced molecular and chemical changes on nanosecond time scale. Raman spectra were measured as a function of shock pressure in the 1. Read More

    Simultaneous Real-Time Analysis of Bulk and Bottom Cure of Ultraviolet-Curable Inks Using Fourier Transform Infrared Spectroscopy.
    Appl Spectrosc 2017 Jan 1:3702817718203. Epub 2017 Jan 1.
    1 Océ Technologies B.V., Venlo, The Netherlands.
    The curing characteristics of an ultraviolet (UV) ink layer are of utmost importance for the development of UV inks. Measuring either bulk or bottom cure in itself is not new and has been the subject of many articles. In this article, two methods are described based on Fourier transform infrared (FT-IR) spectrometry to measure in real time and simultaneously the bulk and bottom cure of a thin UV ink layer. Read More

    Spectral Behavior of White Pigment Mixtures Using Reflectance, Ultraviolet-Fluorescence Spectroscopy, and Multispectral Imaging.
    Appl Spectrosc 2017 Jan 1:3702817717969. Epub 2017 Jan 1.
    1 Department of Basic and Applied Sciences for Engineering, Sapienza-University of Rome, Rome, Italy.
    Reflectance spectroscopy, ultraviolet (UV)-fluorescence spectroscopy, and multispectral imaging have been widely employed for pigment identification on paintings. From ancient times to the present, lead white, zinc white, and titanium white have been the most important white pigments used for paintings and they are used as pigment markers for dating a work of art. The spectral behavior of these pigments is reported in several scientific papers and websites, but those of their mixtures are quite unknown. Read More

    Probing the Sulfur-Modified Capping Layer of Gold Nanoparticles Using Surface Enhanced Raman Spectroscopy (SERS) Effects.
    Appl Spectrosc 2017 Jan 1:3702817724180. Epub 2017 Jan 1.
    2 Departamento de Engenharia Elétrica-CTII, Universidade Federal do Espírito Santo, Vitória-ES, Brazil.
    Gold nanoparticles (AuNP) exhibit particular plasmonic properties when stimulated by visible light, which makes them a promising tool to many applications in sensor technology and biomedical applications, especially when associated to sulfur-based compounds. Sulfur species form a great variety of self-assembled structures that cap AuNP and this interaction rules the optical and plasmonic properties of the system. Here, we report the behavior of citrate-stabilized gold nanospheres in two distinct sulfur colloidal solutions, namely, thiocyanate and sulfide ionic solutions. Read More

    Through a Window, Brightly: A Review of Selected Nanofabricated Thin-Film Platforms for Spectroscopy, Imaging, and Detection.
    Appl Spectrosc 2017 Sep 17;71(9):2051-2075. Epub 2017 Jul 17.
    2 Department of Physics and Materials, Science & Engineering, Drexel University, Philadelphia, PA, USA.
    We present a review of the use of selected nanofabricated thin films to deliver a host of capabilities and insights spanning bioanalytical and biophysical chemistry, materials science, and fundamental molecular-level research. We discuss approaches where thin films have been vital, enabling experimental studies using a variety of optical spectroscopies across the visible and infrared spectral range, electron microscopies, and related techniques such as electron energy loss spectroscopy, X-ray photoelectron spectroscopy, and single molecule sensing. We anchor this broad discussion by highlighting two particularly exciting exemplars: a thin-walled nanofluidic sample cell concept that has advanced the discovery horizons of ultrafast spectroscopy and of electron microscopy investigations of in-liquid samples; and a unique class of thin-film-based nanofluidic devices, designed around a nanopore, with expansive prospects for single molecule sensing. Read More

    Applying Full Spectrum Analysis to a Raman Spectroscopic Assessment of Fracture Toughness of Human Cortical Bone.
    Appl Spectrosc 2017 Jan 1:3702817718149. Epub 2017 Jan 1.
    1 Department of Orthopaedic Surgery and Rehabilitation, Vanderbilt University Medical Center, Nashville, TN, USA.
    A decline in the inherent quality of bone tissue is a † Equal contributors contributor to the age-related increase in fracture risk. Although this is well-known, the important biochemical factors of bone quality have yet to be identified using Raman spectroscopy (RS), a nondestructive, inelastic light-scattering technique. To identify potential RS predictors of fracture risk, we applied principal component analysis (PCA) to 558 Raman spectra (370-1720 cm(-1)) of human cortical bone acquired from 62 female and male donors (nine spectra each) spanning adulthood (age range = 21-101 years). Read More

    Nondispersive Infrared Gas Analyzer for Vapor Density Measurements of a Carbonyl-Containing Organometallic Cobalt Precursor.
    Appl Spectrosc 2017 Jan 1:3702817716939. Epub 2017 Jan 1.
    2 EMD Performance Materials, Haverhill, MA, USA.
    A nondispersive infrared (NDIR) gas analyzer was demonstrated for measuring the vapor-phase density of the carbonyl-containing organometallic cobalt precurso μ(2)-η(2)-((t)Bu-acetylene) dicobalthexacarbonyl (CCTBA). This sensor was based on direct absorption by CCTBA vapor in the C≡O stretching spectral region and utilized a stable, broadband IR filament source, an optical chopper to modulate the source, a bandpass filter for wavelength isolation, and an InSb detector. The optical system was calibrated by selecting a calibration factor to convert CCTBA absorbance to a partial pressure that, when used to calculate CCTBA flow rate and CCTBA mass removed from the ampoule, resulted in an optically determined mass that was nominally equal to a gravimetrically-determined mass. Read More

    Dual-Domain Calibration Transfer Using Orthogonal Projection.
    Appl Spectrosc 2017 Jan 1:3702817724164. Epub 2017 Jan 1.
    Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, USA.
    We report the use of dual-domain regression models, which were built utilizing a wavelet prism decomposition and paired with transfer by orthogonal projection, for the calibration transfer of near-infrared (NIR) spectra. The new method is based on obtaining specific frequency components for a spectrum via wavelet analysis, projecting the frequency components of the primary instrument onto the subspace orthogonal to the mean instrumental difference between spectra from the primary and the secondary instrument, and weighting each frequency component model according to the cross-validation error of the frequency components of the projected primary instrument's spectra to generate a stacked ensemble model robust to contributions to the spectra from instrumental variations. The method, which does not require property values from the secondary data set, is tested on three NIR data sets, and is compared with orthogonal projection in the wavelength domain, orthogonal signal correction, and with model updating approaches. Read More

    Thermo-Optical Properties of Perfluorinated Sulfonic Acid Membranes: An Investigation of Hydration Based on Absorption Spectra.
    Appl Spectrosc 2017 Jan 1:3702817723649. Epub 2017 Jan 1.
    2 Departamento de Biologia Geral, Universidade Estadual de Ponta Grossa, Brazil.
    The Nafion membranes are widely used in electrochemical applications such as fuel cells, chlor-alkali cells, and actuators-sensors. In this work, the thermal-optical characterization of Nafion in acid form was performed by photoacoustic spectroscopy, thermogravimetry, and differential scanning calorimetry. In the experimental procedure three distinct hydration levels were considered: (1) pristine membrane (λ ≅ H2O/-SO3H ≅ 5. Read More

    Competitive Binding Investigations and Quantitation in Surface-Enhanced Raman Spectra of Binary Dye Mixtures.
    Appl Spectrosc 2017 Jan 1:3702817723339. Epub 2017 Jan 1.
    1 Department of Sciences, John Jay College of Criminal Justice, New York, NY, USA.
    This research presents a study in surface-enhanced Raman quantitation of dyes present in mixtures of alizarin and purpurin using standard calibration curves and Langmuir isotherm calibration models. Investigations of the nature of competitive adsorption onto silver nanoparticles by centrifugation indicates that both dyes in the mixture interact with the nanoparticles simultaneously, but only the stronger adsorbing one is seen to dominate the spectral characteristics. Calibration can be carried out by careful selection of peaks characteristic to each dye in the mixture. Read More

    Chemical Characterization and Determination of the Anti-Oxidant Capacity of Two Brown Algae with Respect to Sampling Season and Morphological Structures Using Infrared Spectroscopy and Multivariate Analyses.
    Appl Spectrosc 2017 Jan 1:3702817715654. Epub 2017 Jan 1.
    5 Laboratory of Infrared Spectroscopy and Chemometrics, Department of Instrumental Analysis, Faculty of Pharmacy, University of Concepcion, Concepcion, Chile.
    Brown algae biomass has been shown to be a highly important industrial source for the production of alginates and different nutraceutical products. The characterization of this biomass is necessary in order to allocate its use to specific applications according to the chemical and biological characteristics of this highly variable resource. The methods commonly used for algae characterization require a long time for the analysis and rigorous pretreatments of samples. Read More

    In Situ Raman Spectral Characteristics of Carbon Dioxide in a Deep-Sea Simulator of Extreme Environments Reaching 300 ℃ and 30 MPa.
    Appl Spectrosc 2017 Jan 1:3702817722820. Epub 2017 Jan 1.
    1 Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.
    Deep-sea carbon dioxide (CO2) plays a significant role in the global carbon cycle and directly affects the living environment of marine organisms. In situ Raman detection technology is an effective approach to study the behavior of deep-sea CO2. However, the Raman spectral characteristics of CO2 can be affected by the environment, thus restricting the phase identification and quantitative analysis of CO2. Read More

    The Importance of Interactions at the Molecular Level: A Spectroscopic Study of a New Composite Sorber Material.
    Appl Spectrosc 2017 Jan 1:3702817723053. Epub 2017 Jan 1.
    2 SAES Getters S.p.A., Lainate, Italy.
    The functional properties of a new composite material having water vapor getter properties have been investigated by a large arsenal of characterization techniques. The composite system is originated by combining two constituents having very different chemical natures, a magnesium perchlorate (Mg(ClO4)2) salt and a polymeric acrylic matrix. In particular, Fourier transform infrared (FT-IR) and Raman spectroscopy have been fundamental to understand the type of interactions between the salt and the matrix in different hydration conditions. Read More

    Wavelength Selection Method Based on Differential Evolution for Precise Quantitative Analysis Using Terahertz Time-Domain Spectroscopy.
    Appl Spectrosc 2017 Jan 1:3702817722367. Epub 2017 Jan 1.
    1 College of Information Science and Engineering, Henan University of Technology, Zhengzhou, China.
    Quantitative analysis of component mixtures is an important application of terahertz time-domain spectroscopy (THz-TDS) and has attracted broad interest in recent research. Although the accuracy of quantitative analysis using THz-TDS is affected by a host of factors, wavelength selection from the sample's THz absorption spectrum is the most crucial component. The raw spectrum consists of signals from the sample and scattering and other random disturbances that can critically influence the quantitative accuracy. Read More

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