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Journal articles on the topic 'IR/THz simultaneous spectroscopy'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Chupas, Peter, Karena Chapman, Kevin Beyer, Olaf Borkiewicz, and Haiyan Zhao. "Simultaneous infrared spectroscopy and X-ray PDF measurements." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1179. http://dx.doi.org/10.1107/s2053273314088202.

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Combining insights from diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) and X-ray pair distribution function (PDF) analysis has the potential to provide deeper insight into complex materials systems under reactive conditions, including heterogeneous catalysts and host-guest systems. We have developed instrumentation and non-ambient reaction cells that enable combined PDF-IR studies without compromise to either measurement. Through careful selection of the IR spectrometer and optics, the IR instrument and reaction cell were adapted to allow angular dispersive X-ray measureme

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2

Śliwińska, Smolinski, and Kucharski. "Simultaneous Analysis of Heavy Metal Concentration in Soil Samples." Applied Sciences 9, no. 21 (2019): 4705. http://dx.doi.org/10.3390/app9214705.

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The application of Fourier transform infrared spectroscopy to the simultaneous analysis of heavy metal concentration in soil samples was demonstrated in this paper. Two spectral techniques, namely, attenuated total reflectance (ATR) and diffuse reflectance (DRIFT), were applied and the whole infrared spectral region, i.e., far IR, mid IR, and near IR were considered in this work. Spectral data with reference to the results of laboratory analysis enabled the development of calibration partial least squares (PLS) models. The PLS models for the ATR near IR were characterized by a good fit and goo

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Pelletier, Isabelle, Christian Pellerin, D. Bruce Chase, and John F. Rabolt. "New Developments in Planar Array Infrared Spectroscopy." Applied Spectroscopy 59, no. 2 (2005): 156–63. http://dx.doi.org/10.1366/0003702053085043.

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A planar array infrared (PA-IR) spectrograph offers several advantages over other infrared approaches, including high acquisition rate and sensitivity. However, it suffers from some important drawbacks, such as a limited spectral range and a significant curvature of the recorded spectral images, which still need to be addressed. In this article, we present new developments in PA-IR spectroscopy that overcome these drawbacks. First, a data processing method for the correction of the curvature observed in the spectral images has been developed and refined. In addition, a dual-beam instrument tha

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4

Zhu, Qianqian, Rui Zhou, Jun Liu, Jianzhong Sun, and Qianqian Wang. "Recent Progress on the Characterization of Cellulose Nanomaterials by Nanoscale Infrared Spectroscopy." Nanomaterials 11, no. 5 (2021): 1353. http://dx.doi.org/10.3390/nano11051353.

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Researches of cellulose nanomaterials have seen nearly exponential growth over the past several decades for versatile applications. The characterization of nanostructural arrangement and local chemical distribution is critical to understand their role when developing cellulose materials. However, with the development of current characterization methods, the simultaneous morphological and chemical characterization of cellulose materials at nanoscale resolution is still challenging. Two fundamentally different nanoscale infrared spectroscopic techniques, namely atomic force microscope based infr

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5

Sullivan, David H., W. Curtis Conner, and Michael P. Harold. "Surface Analysis with FT-IR Emission Spectroscopy." Applied Spectroscopy 46, no. 5 (1992): 811–18. http://dx.doi.org/10.1366/0003702924124844.

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The technique of infrared emission spectroscopy (IRES) is reviewed and further examined in this study as a surface analysis tool. A system has been designed which allows simultaneous kinetic and in situ infrared emission analysis of catalyst surfaces. IRES spectra of several gas mixture/solid systems are obtained in order to examine sample preparation and spectra processing issues; these systems include Pt/Al2O3 exposed to CO and CO-NO mixtures, an oxidized copper plate, and a zeolite exposed to inert atmospheres. For the temperature range of importance to catalysis (300–600 K), IRES is limite

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6

Beyer, Kevin A., Haiyan Zhao, Olaf J. Borkiewicz, Mark A. Newton, Peter J. Chupas, and Karena W. Chapman. "Simultaneous diffuse reflection infrared spectroscopy and X-ray pair distribution function measurements." Journal of Applied Crystallography 47, no. 1 (2013): 95–101. http://dx.doi.org/10.1107/s1600576713028410.

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Combining insights from diffuse reflection infrared Fourier transform spectroscopy and X-ray pair distribution function (PDF) analysis has the potential to deepen our understanding of complex materials systems including heterogeneous catalysts and host–guest systems. This article describes the development of instrumentation and non-ambient reaction cells that enable combined PDF–IR studies without compromise to either measurement. Through careful selection of the IR spectrometer and optics, the IR instrument and reaction cell were adapted to allow angular dispersive X-ray measurements without

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7

Liu, Kan-Zhi, R. Anthony Shaw, Angela Man, Thomas C. Dembinski, and Henry H. Mantsch. "Reagent-free, Simultaneous Determination of Serum Cholesterol in HDL and LDL by Infrared Spectroscopy." Clinical Chemistry 48, no. 3 (2002): 499–506. http://dx.doi.org/10.1093/clinchem/48.3.499.

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Abstract Background: The purpose of this study was to assess the feasibility of infrared (IR) spectroscopy for the simultaneous quantification of serum LDL-cholesterol (LDL-C) and HDL-cholesterol (HDL-C) concentrations. Methods: Serum samples (n = 90) were obtained. Duplicate aliquots (5 μL) of the serum specimens were dried onto IR-transparent barium fluoride substrates, and transmission IR spectra were measured for the dry films. In parallel, the HDL-C and LDL-C concentrations were determined separately for each specimen by standard methods (the Friedewald formula for LDL-C and an automated

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8

Hazel, G., F. Bucholtz, I. D. Aggarwal, G. Nau, and K. J. Ewing. "Multivariate Analysis of Mid-IR FT-IR Spectra of Hydrocarbon-Contaminated Wet Soils." Applied Spectroscopy 51, no. 7 (1997): 984–89. http://dx.doi.org/10.1366/0003702971941359.

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This article describes a series of mid-IR FT-IR reflectance spectroscopy measurements of hydrocarbon-contaminated wet soils. The eventual goal of this work is the development of an analysis tool suitable for real-time in situ underground measurements where a suitable reference spectrum is not available. Multivariate analysis of the resulting spectral data indicates that the strongly varying wet soil matrix and the absence of a suitable reference spectrum in the field do not render this measurement technique unfeasible as a means of realizing remote in situ chemical detection in wet soils. It w

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9

Shaw, R. Anthony, Steven Kotowich, Michael Leroux, and Henry H. Mantsch. "Multianalyte Serum Analysis Using Mid-Infrared Spectroscopy." Annals of Clinical Biochemistry: International Journal of Laboratory Medicine 35, no. 5 (1998): 624–32. http://dx.doi.org/10.1177/000456329803500505.

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This study assesses the potential for using mid-infrared (mid-IR) spectroscopy of dried serum films as the basis for the simultaneous quantitation of eight serum analytes: Total protein, albumin, triglycerides, cholesterol, glucose, urea, creatinine and uric acid. Infrared transmission spectra were acquired for 300 serum samples, each analysed independently using accepted reference clinical chemical methods. Quantitation methods were based upon the infrared spectra and reference analyses for 200 specimens, and the models validated using the remaining 100 samples. Standard errors in the IR-pred

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10

Manning, Christopher J., and Peter R. Griffiths. "Step-Scanning Interferometer with Digital Signal Processing." Applied Spectroscopy 47, no. 9 (1993): 1345–49. http://dx.doi.org/10.1366/0003702934067630.

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A novel step-scan FT-IR spectrometer incorporating a digital signal processor for demodulation of the detector signal is described. The potential advantages of this method of signal processing are discussed and illustrated. The instrument is based on a commercial cube-corner interferometer which has been modified by replacement of the drive motor with a stepper motor-micrometer and piezoelectric transducer combination. The interferometer retardation is feedback controlled by a 486–50 personal computer, which also controls the digital signal processor and collects spectral data. More than one p

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11

Alam, M. M., S. M. S. Islam, S. M. M. Rahman, and M. M. Rahman. "Simultaneous Preparation of Facial and Meridional Isomer of Cobalt-Amino Acid Complexes and their Characterization." Journal of Scientific Research 2, no. 1 (2009): 91–98. http://dx.doi.org/10.3329/jsr.v2i1.2032.

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Preparation and characterization of various complexes of cobalt (III)-amino acid system, especially cobalt (III) glycinato and cobalt (III) alaninato complexes are reported. The identification of the various isomers of these complexes is also reported. The various isomers are separated from their mixture by fractional crystallization. Each of these complexes has been characterized by observing physical characteristics, chemical analysis, UV-visible spectroscopy and IR-spectroscopy. The direct impact of geometry of the complexes to IR stretching frequencies and UV-visible spectral data of amino

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Tarach, Karolina A., Anna K. Walczyk, Agata Kordek, Oliwia Rogala, and Kinga Góra-Marek. "Silver-Loaded Chabazite in Ethanol-to-Hydrocarbon Process—Operando FT-IR and UV-Vis Spectroscopic Studies." Molecules 29, no. 6 (2024): 1207. http://dx.doi.org/10.3390/molecules29061207.

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The ethanol dehydration process is studied regarding protonic and Ag-loaded chabazite zeolite in advanced FT-IR and UV-vis operando spectroscopic studies with simultaneous mass spectroscopy and gas chromatography analyses of products. The spectroscopic investigation provides information on the species formed on the surface of catalysts, while mass spectrometry and gas chromatography methods identify the desorbed products. These studies are also supported by spectroscopic, chromatographic, and thermogravimetric analyses of coke species formed over the catalyst’s surface during ethanol conversio

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Lanzarotta, Adam, Travis Falconer, Heather McCauley, et al. "Simultaneous Orthogonal Drug Detection Using Fully Integrated Gas Chromatography with Fourier Transform Infrared Detection and Mass Spectrometric Detection." Applied Spectroscopy 71, no. 5 (2016): 1050–59. http://dx.doi.org/10.1177/0003702816668534.

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Analytes that co-elute and yield nearly identical electron ionization (EI) mass spectra, as well as analytes that yield non-specific EI fragmentation patterns, have been identified using fully integrated gas chromatography with direct deposit Fourier transform infrared detection and mass spectrometric detection (GC/FT-IR/MS). While the IR detector proved to be more selective for identifying analytes such as synthetic cannabinoids and weight loss drugs, it was limited by a relatively high detection limit of 8.4 parts per million (ppm) for non-targeted identification of sibutramine based on a si

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14

Blanco, M., J. Coello, H. Iturriaga, S. Maspoch, and E. Bertran. "Simultaneous Determination of Rubber Additives by FT-IR Spectrophotometry with Multivariate Calibration." Applied Spectroscopy 49, no. 6 (1995): 747–53. http://dx.doi.org/10.1366/0003702953964453.

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A new method for the simultaneous determination of vulcanized rubber additives by Fourier transform infrared (FT-IR) spectrophotometry using partial least-squares regression (PLSR) for multivariate calibration was developed. The effect of various wavenumber ranges and the use of the absorbance and first-derivative spectral modes on performance were studied by applying the method to three different sample batches containing several additives in different proportions, all of which were resolved with satisfactory results.

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15

Bhargava, Rohit, and Ira W. Levin. "Time-Resolved Fourier Transform Infrared Spectroscopic Imaging." Applied Spectroscopy 57, no. 4 (2003): 357–66. http://dx.doi.org/10.1366/00037020360625880.

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Fourier transform infrared (FT-IR) imaging allows simultaneous spectral characterization of large spatial areas due to its multichannel detection advantage. The acquisition of large amounts of data in the multichannel configuration results, however, in a poor temporal resolution of sequentially acquired data sets, which limits the examination of dynamic processes to processes that have characteristic time scales of the order of minutes. Here, we introduce the concept and instrumental details of a time-resolved infrared spectroscopic imaging modality that permits the examination of repetitive d

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16

Zhang, Lizhong, James E. Franke, Thomas M. Niemczyk, and David M. Haaland. "Optimized External IR Reflection Spectroscopy for Quantitative Determination of Borophosphosilicate Glass Parameters." Applied Spectroscopy 51, no. 2 (1997): 259–64. http://dx.doi.org/10.1366/0003702971940161.

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Infrared (IR) external reflection spectroscopy has been optimized for the quantitative determination of composition and film thickness of borophosphosilicate glass (BPSG) deposited on silicon wafer substrates. The precision of the partial least-squares calibrations for boron and phosphorus contents and thin-film thickness were measured as the cross-validated standard error of prediction statistic. The results showed that BPSG IR reflection spectra collected over a wide range of incident IR radiation angles (15°, 25°, 45°, and 60°) can be used for the simultaneous quantification of these three

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17

Aykas, Didem P., and Luis Rodriguez-Saona. "What’s in Your Fruit Juice?—Rapid Quality Screening Based on Infrared (FT-IR) Spectroscopy." Applied Sciences 14, no. 4 (2024): 1654. http://dx.doi.org/10.3390/app14041654.

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Fruit juices (FJ) have gained widespread global consumption, driven by their perceived health benefits. The accuracy of nutrition information is essential for consumers assessing FJ quality, especially with increasing concerns about added sugars and obesity risk. Conversely, ascorbic acid (Vitamin C), found in nature in many fruits and vegetables, is often lost due to its susceptibility to light, air, and heat, and it undergoes fortification during FJ production. Current analytical methods for determining FJ components are time-consuming and labor-intensive, prompting the need for rapid analyt

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18

Han, Liuyang, Xiangna Han, Guoqing Liang, et al. "Even Samples from the Same Waterlogged Wood Are Hygroscopically and Chemically Different by Simultaneous DVS and 2D COS-IR Spectroscopy." Forests 14, no. 1 (2022): 15. http://dx.doi.org/10.3390/f14010015.

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Waterlogged archaeological wood samples may degrade during long-term immersion in microbial-activity environments, which causes its biodegradation. Simultaneous dynamic vapor sorption (SDVS) and two-dimensional correlation infrared (2D COS-IR) spectroscopy reveal the degradation inhomogeneity of waterlogged fir wood from the Shengbeiyu shipwreck. The waterlogged and reference wood exhibit type II sorption isotherms. The equilibrium moisture contents of waterlogged archaeological fir wood from a decay region (WFD) were 22.5% higher than those of waterlogged archaeological fir wood from a sound

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19

Cardinali, Martina Alunni, Irene Bargagli, Valeria Di Tullio, et al. "Multimodal spectroscopic assessment of mechanical and chemical properties of ABS objects in cultural heritage preservation." EPJ Web of Conferences 309 (2024): 14006. http://dx.doi.org/10.1051/epjconf/202430914006.

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The 1960s saw the emergence of plastic as an indispensable component in various fields, including art and design. Acrylonitrile-butadiene-styrene (ABS) is widely used by artists and designers for a range of applications including sculptures and decorative pieces. Consequently, the necessity to conserve ABS from deterioration is a crucial issue in the field of cultural heritage preservation. Many studies have highlighted the criticality of the stability of the polybutadiene component when exposed to light. We propose a new multimodal spectroscopic approach to assess the conservation status of p

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20

R. Delgado, Montserrat. "Structure and Stability of Gas Adsorption Complexes in Periodic Porous Solids as Studied by VTIR Spectroscopy: An Overview." Applied Sciences 10, no. 23 (2020): 8589. http://dx.doi.org/10.3390/app10238589.

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Variable-temperature infrared (VTIR) spectroscopy is an instrumental technique that enables structural characterization of gas-solid adsorption complexes by analysis of meaningful vibrational modes, and simultaneous determination of the standard enthalpy change (ΔH0) involved in the gas adsorption process, which allows one to quantify the stability of the corresponding complex. This is achieved by a van’t Hoff analysis of a set of IR spectra recorded over a sufficiently large temperature range. Herein, the use of this versatile spectroscopic technique is demonstrated by reviewing its applicati

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Gokus, Tobias. "Nano-FTIR Correlation Nanoscopy for Organic and Inorganic Material Analysis." ECS Meeting Abstracts MA2022-01, no. 7 (2022): 622. http://dx.doi.org/10.1149/ma2022-017622mtgabs.

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Significance: Correlation scanning probe techniques to complement nanoscale IR measurements for next generation sample characterization Scattering-type Scanning Near-field Optical Microscopy (s-SNOM) is a scanning probe approach to optical microscopy and spectroscopy, bypassing the ubiquitous diffraction limit of light to achieve a spatial resolution below 20 nanometers. s-SNOM employs the strong confinement of light at the apex of a sharp metallic atomic force microscopy (AFM) tip to create a nanoscale optical hot-spot. Analyzing the scattered light from the tip enables the extraction of the

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22

Wang, Dun Jia, Yan Fang Kang, and Ben Po Xu. "Preparation and Thermal Decomposition of the Polyoxometalate Complexes of Ciprofloxacin with H_nXW₁₂O₄₀ (X=B, Si, P)." Advanced Materials Research 335-336 (September 2011): 1075–78. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.1075.

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The polyoxometalate complexes of ciprofloxacin with HnXW12O40(X=B, Si, P) were prepared from ciprofloxacin hydrochloride and HnXW12O40·nH2O (X=B, Si, P) in aqueous solution, and characterized by elemental analysis, IR spectra and TG-DTA. The IR spectrum confirmed the presence of Keggin-type anion of heteropoly acids and the characteristic functional group of ciprofloxacin after the polyoxometalate complexes are formed. The TG/DTA curves showed that their thermal decomposition was a more-steps process consisting of simultaneous processes involving also Keggin anion. The residue of decomposition

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23

Ruiz, Y. P., M. F. Ferrão, M. B. Cardoso, E. A. Moncada, and J. H. Z. dos Santos. "Structural discrimination of nanosilica particles and mixed-structure silica by multivariate analysis applied to SAXS profiles in combination with FT-IR spectroscopy." RSC Advances 6, no. 76 (2016): 72306–16. http://dx.doi.org/10.1039/c6ra03306g.

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New methodology to quickly identify changes in the structural properties of mesoporous silica materials through simultaneous multivariate analyses applied to techniques with different principles as SAXS curves and FT-IR spectra.

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24

Razeghi, Manijeh, and Quanyong Lu. "Room Temperature Terahertz and Frequency Combs Based on Intersubband Quantum Cascade Laser Diodes: History and Future." Photonics 12, no. 1 (2025): 79. https://doi.org/10.3390/photonics12010079.

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The year 2024 marks the 30-year anniversary of the quantum cascade laser (QCL), which is becoming the leading laser source in the mid-infrared (mid-IR) range. Since the first demonstration, QCL has undergone tremendous development in terms of the output power, wall plug efficiency, spectral coverage, wavelength tunability, and beam quality. Owing to its unique intersubband transition and fast gain features, QCL possesses strong nonlinearities that makes it an ideal platform for nonlinear photonics like terahertz (THz) difference frequency generation and direct frequency comb generation via fou

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Cronin, J. T., and T. B. Brill. "Thermal Decomposition of Energetic Materials 26. Simultaneous Temperature Measurements of the Condensed Phase and Rapid-Scan FT-IR Spectroscopy of the Gas Phase at High Heating Rates." Applied Spectroscopy 41, no. 7 (1987): 1147–51. http://dx.doi.org/10.1366/0003702874447626.

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Rapid-scan infrared spectroscopy (RSFT-IR) with better than 100-ms temporal resolution has been used to quantify the gas decomposition products of energetic materials in real time at various heating rates up to 800°C/s and under buffer gas pressures of 1 to 1000 psi. A new method is described that permits simultaneous real-time recording of the temperature of the condensed phase and of the IR spectra of the gaseous products under the above conditions. Endothermic and exothermic events in the condensed phase can now be correlated with the evolved gases under conditions approaching those of comb

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26

Fernandez Peña, Ivan, Axayacatl Alvarado Palacios, Enrique Barrera Calva, et al. "Spray-pyrolyzed Al2O3-Ag Nano-Cermets coatings for solar absorbers." Revista Mexicana de Física 64, no. 4 (2018): 392. http://dx.doi.org/10.31349/revmexfis.64.392.

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In this work, it is shown the feasibility for obtaining silver nanoparticles by ultrasonic spray pyrolysis and their simultaneous incorporation during deposition of thin layers of aluminum oxide to get a Cermet coating of Al2O3-Ag. The synthesis of these Cermets was achieved on the basis of both the simultaneous pyrolysis of silver nitrate and aluminum acetylacetonate on different substrates: Quartz, glass, crystalline silicon (c-Si), and titanium at temperatures of 500, 550 and 600 °C. The optical and structural properties of the Cermets were studied by Scanning Electron Microscopy, Atomic Fo

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27

Martínez-Romo, A., R. González-Mota, J. J. Soto-Bernal, and I. Rosales-Candelas. "LDPE Oxidation by CO2 Laser Radiation (10.6 µm)." International Journal of Polymer Science 2018 (2018): 1–5. http://dx.doi.org/10.1155/2018/5150673.

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Thermooxidation of LDPE films by CO2 laser radiation, 10.6 μm, was characterized by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR). The formation of carbonyl and hydroxyl functional groups onto LDPE films was dependent on the fluency of CO2 laser. IR absorption of vinyl groups and C-O bond present in alcohols showed a decrease and an increase, respectively, indicating that CO2 laser radiation causes simultaneous formation and accumulation of hydroperoxides in LDPE films; furthermore, crystallinity of LDPE films irradiated with CO2 tends to increase. So, CO

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Strug, Ivona, Christopher Utzat, Amedeo Cappione, et al. "Development of a Univariate Membrane-Based Mid-Infrared Method for Protein Quantitation and Total Lipid Content Analysis of Biological Samples." Journal of Analytical Methods in Chemistry 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/657079.

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Biological samples present a range of complexities from homogeneous purified protein to multicomponent mixtures. Accurate qualification of such samples is paramount to downstream applications. We describe the development of an MIR spectroscopy-based analytical method offering simultaneous protein quantitation (0.25–5 mg/mL) and analysis of total lipid or detergent species, as well as the identification of other biomolecules present in biological samples. The method utilizes a hydrophilic PTFE membrane engineered for presentation of aqueous samples in a dried format compatible with fast infrare

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Wei, Qianhe, Bincheng Li, Jing Wang, Binxing Zhao, and Ping Yang. "Impact of Residual Water Vapor on the Simultaneous Measurements of Trace CH4 and N2O in Air with Cavity Ring-Down Spectroscopy." Atmosphere 12, no. 2 (2021): 221. http://dx.doi.org/10.3390/atmos12020221.

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Methane (CH4) and nitrous oxide (N2O) are among the most important atmospheric greenhouse gases. A gas sensor based on a tunable 7.6 μm continuous-wave external-cavity mode-hop-free (EC-MHF) quantum cascade laser (from 1290 to 1350 cm−1) cavity ring-down spectroscopy (CRDS) technique was developed for the simultaneous detection of CH4 and N2O in ambient air with water vapor (H2O) mostly removed via molecular sieve drying to minimize the impact of H2O on the simultaneous measurements. Still, due to the broad and strong absorption spectrum of H2O in the entire mid-infrared (mid-IR) spectral rang

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Zhu, Suyun, Mattia Scardamaglia, Jan Kundsen, et al. "HIPPIE: a new platform for ambient-pressure X-ray photoelectron spectroscopy at the MAX IV Laboratory." Journal of Synchrotron Radiation 28, no. 2 (2021): 624–36. http://dx.doi.org/10.1107/s160057752100103x.

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HIPPIE is a soft X-ray beamline on the 3 GeV electron storage ring of the MAX IV Laboratory, equipped with a novel ambient-pressure X-ray photoelectron spectroscopy (APXPS) instrument. The endstation is dedicated to performing in situ and operando X-ray photoelectron spectroscopy experiments in the presence of a controlled gaseous atmosphere at pressures up to 30 mbar [1 mbar = 100 Pa] as well as under ultra-high-vacuum conditions. The photon energy range is 250 to 2200 eV in planar polarization and with photon fluxes >1012 photons s−1 (500 mA ring current) at a resolving power of greater t

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Consolino, Luigi, Malik Nafa, Michele De Regis, et al. "Direct Observation of Terahertz Frequency Comb Generation in Difference-Frequency Quantum Cascade Lasers." Applied Sciences 11, no. 4 (2021): 1416. http://dx.doi.org/10.3390/app11041416.

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Terahertz quantum cascade laser sources based on intra-cavity difference frequency generation from mid-IR devices are an important asset for applications in rotational molecular spectroscopy and sensing, being the only electrically pumped device able to operate in the 0.6–6 THz range without the need of bulky and expensive liquid helium cooling. Here we present comb operation obtained by intra-cavity mixing of a distributed feedback laser at λ = 6.5 μm and a Fabry–Pérot device at around λ = 6.9 μm. The resulting ultra-broadband THz emission extends from 1.8 to 3.3 THz, with a total output powe

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Krstić, Marko, and Slavica Ražić. "Analytical Approaches to the Characterization of Solid Drug Delivery Systems with Porous Adsorbent Carriers." Current Medicinal Chemistry 25, no. 33 (2018): 3956–72. http://dx.doi.org/10.2174/0929867325666180212120908.

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A large variety of analytical techniques are available to meet the needs of characterization of solid samples. But, when solid drug delivery systems are concerned we are faced with demanding methodologies which have to compile capabilities of analytical techniques in regard to large diversity of structures and surface functionality of analyzed adsorbent carriers. In this review, the most commonly used analytical techniques are presented with their basic principles, advantages and disadvantages in applications of interest. Adsorbent carriers are widely used today as ingredients in the formulati

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Smolikov, M. D., V. A. Shkurenok, L. I. Bikmetova, N. N. Leontieva, and A. V. Lavrenov. "Simultaneous Isomerization of Hexane and Heptane in the Presence of Pt-Containing Tungstated Zirconia Catalysts." Kataliz v promyshlennosti 22, no. 6 (2022): 30–40. http://dx.doi.org/10.18412/1816-0387-2022-6-30-40.

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Isomerization of heptane and hexane and their mixtures in the presence of Pt/WO3-ZrO2 catalysts with the tungsten oxide content of 10–35 wt.% was studied. The best characteristics of isomerization of the С6–С7 alkanes mixture were observed on the catalysts with the WO3 content of 15–20 wt.%. According to ammonia thermodesorption data, the number of acid sites typically increases in this range of tungsten oxide content; according to IR spectroscopy of adsorbed CO, this occurs mostly with an increase in the number of Broensted acid sites.

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Daescu, M., M. Oprica, I. Smaranda, et al. "Vibrational and Photoluminescence Properties of Composites Based on Double-Walled Carbon Nanotubes, Poly(o-phenylenediamine) and Poly(ethylene oxide)." Journal of Nanoscience and Nanotechnology 21, no. 4 (2021): 2334–41. http://dx.doi.org/10.1166/jnn.2021.18975.

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Chemical polymerization of o-phenylenediamine (OPD) in the presence of poly(ethylene oxide), double-wall carbon nanotubes (DWNTs) and ferric chloride is carried out in order to obtain composites based on the poly(o-phenylenediamine)-poly(ethylene oxide) (POPD-PEO) fibres covered and interconnected with DWNTs. Vibrational and photoluminescence properties of these composite materials as well as their morphologies are shown by infrared (IR) spectroscopy, Raman scattering, photoluminescence (PL) and scanning electron microscopy (SEM). An adsorption of DWNTs onto the POPD rods surface in the absenc

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Smyrl, N. R., D. M. Hembree, W. E. Davis, D. M. Williams, and J. C. Vance. "Simultaneous GC-FT-IR/GC-MS Analysis for Isomer-Specific Identification and Quantitation of Complex Mixture Components." Applied Spectroscopy 46, no. 2 (1992): 277–82. http://dx.doi.org/10.1366/0003702924125636.

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The construction and capabilities of a new instrument combining infrared and mass spectrometry to simultaneously examine the effluent from a single capillary column gas chromatographic injection are described. Gas chromatography-mass spectrometry (GC-MS) is performed in the conventional manner. However, the Fourier transform infrared (FT-IR) portion of the instrument employs a new sampling method involving low-temperature trapping of the effluent from the gas chromatograph. The mass spectrometer was over two orders of magnitude more sensitive (161 fg detection limit for naphthalene) than the i

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Huffman, Scott W., Rohit Bhargava, and Ira W. Levin. "Generalized Implementation of Rapid-Scan Fourier Transform Infrared Spectroscopic Imaging." Applied Spectroscopy 56, no. 8 (2002): 965–69. http://dx.doi.org/10.1366/000370202760249684.

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We describe a novel, generalized data acquisition sequence to allow rapid-scan Fourier transform infrared (FT-IR) spectroscopic imaging using focal plane array (FPA) detectors. This technique derives its applicability from the reproducible performance of modern FT-IR instrumentation and the availability of FPAs with simultaneous, full array acquisition, or snapshot electronics. Instead of sampling the entire interferogram in one mirror sweep over a predetermined retardation, as in traditional continuous-scanning techniques, the modulated light from the interferometer is recorded over several m

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Guo, Zhi Rui, Y. DuanMu, and Ning Gu. "One-Step Preparation of Fibrous Aggregates of Gold Nanoparticles Using Aniline as Reducing Agent as well as Monomer." Solid State Phenomena 121-123 (March 2007): 251–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.251.

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Nanoscaled fibrous aggregates of gold nanoparticles have been synthesized by a simultaneous reduction-oxidation polymerization process using aniline as reducing agent as well as monomer in an ethanol medium. Time-dependent UV-Vis absorption spectroscopy was used to track the formation process of gold nanoparticles. The transmission electron microscopy (TEM) images and Fourier transform infrared (FT-IR) spectrum of the as-preapred products indicate these gold nanoparticles were binded by the oxidation polymerization resultant of aniline.

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Ogurtsov, Vladimir A., and Oleg A. Rakitin. "(2,3-Dihydro-1H-indol-5-ylmethyl)amine." Molbank 2021, no. 3 (2021): M1248. http://dx.doi.org/10.3390/m1248.

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New (2,3-dihydro-1H-indol-5-ylmethyl)amine was synthesized from 2-((1-acetylindolin-5-yl)methyl)isoindoline-1,3-dione by simultaneous deprotection of phthalimide and acetyl groups. The structure of the newly synthesized compounds was established by elemental analysis, high resolution mass-spectrometry, 1H, 13C NMR and IR spectroscopy and mass-spectrometry. The resulting compound is a convenient intermediate for various disubstituted 1-(indolin-5-yl)methanamines, which may be of interest as substances with useful pharmacological properties.

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Chung, Hoeil, Mark A. Arnold, Martin Rhiel, and David W. Murhammer. "Simultaneous Measurements of Glucose, Glutamine, Ammonia, Lactate, and Glutamate in Aqueous Solutions by Near-Infrared Spectroscopy." Applied Spectroscopy 50, no. 2 (1996): 270–76. http://dx.doi.org/10.1366/0003702963906447.

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Calibration models are generated and evaluated for the measurement of five different components in synthetic mixtures prepared in aqueous solutions. Mixtures of glucose, glutamine, ammonia, lactate, and glutamate were prepared to simulate concentration levels expected during routine bioreactor fermentation processes. Near-IR spectra were collected from these solutions over the spectral range from 5000 to 4000 cm−1. This spectral information was used to build individual multivariate calibration models for each analyte. Models were constructed on the basis of partial least-squares regression of

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Kuang, Yiwen, Mengxue Li, Shiyu Hu, et al. "One-Step Co-Electrodeposition of Copper Nanoparticles-Chitosan Film-Carbon Nanoparticles-Multiwalled Carbon Nanotubes Composite for Electroanalysis of Indole-3-Acetic Acid and Salicylic Acid." Sensors 22, no. 12 (2022): 4476. http://dx.doi.org/10.3390/s22124476.

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A sensitive simultaneous electroanalysis of phytohormones indole-3-acetic acid (IAA) and salicylic acid (SA) based on a novel copper nanoparticles-chitosan film-carbon nanoparticles-multiwalled carbon nanotubes (CuNPs-CSF-CNPs-MWCNTs) composite was reported. CNPs were prepared by hydrothermal reaction of chitosan. Then the CuNPs-CSF-CNPs-MWCNTs composite was facilely prepared by one-step co-electrodeposition of CuNPs and CNPs fixed chitosan residues on modified electrode. Scanning electron microscope (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), ener

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Kayumov, R. R., A. A. Lochina, A. N. Lapshin, A. V. Bakirov, and L. V. Shmygleva. "Inion Sulfocation Membranes Plasticized with Propylene Carbonate." Membrany i membrannye tehnologii 14, no. 4 (2024): 276–87. http://dx.doi.org/10.31857/s2218117224040037.

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The rapidly developing field of portable energy sources requires the search and development of effective materials for such devices. To improve the safety of the most common metal-ion batteries (lithium- and sodium-ion), instead of a liquid electrolyte, it is proposed to use a gel-polymer electrolyte with unipolar conductivity based on a Nafion-like electrolyte (Inion), plasticized with aprotic solvents. The work presents the results of a study of the thermal stability, molecular structure and supramolecular packing, as well as ionic conductivity of the Inion membrane in lithium and sodium for

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Tommola, Jorma, Matti Laine, Marianna Sunnari, and Juha O. Rinne. "Images of shadowing and interpreting." Interpreting. International Journal of Research and Practice in Interpreting 5, no. 2 (2000): 147–67. http://dx.doi.org/10.1075/intp.5.2.06tom.

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We begin by noting that, in addition to the more or less established trends of cognitive modelling and neurolinguistic or behavioural experimentation, a more recent orientation in research on interpreting (IR) as a complex cognitive process is functional neuroimaging. We then describe current brain imaging methods — electroencephalography, magnetoencephalography, positron emission tomography, functional magnetic resonance imaging, and near-infrared spectroscopy — and provide selected examples of their use in language processing and interpreting research, accompanied with brief evaluations of t

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Smirnov, Mikhail S., Aleksey S. Perepelitsa, Tamara S. Kondratenko, Andrey I. Zvyagin, and Oleg V. Ovchinnikov. "Spectral properties of hybrid associates of colloidal quantum dots Zn0.5Cd0.5S, europium tenoyltrifluoroacetonate and methylene blue." EPJ Web of Conferences 190 (2018): 04017. http://dx.doi.org/10.1051/epjconf/201819004017.

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Hybrid associates formed from colloidal Zn0.5Cd0.5S quantum dots, passivated with thioglycolic acid, europium tenoyltrioteracetonate and methylene blue molecules, absorption, luminescence, IR and time-resolved spectroscopy technique are studied. The shift of the IR absorption bands of COO- and C=O groups of thioglycolic acid and europium thenoyltrifluoroacetonate has been detected. An increase in the efficiency of excitation of europium luminescence and a simultaneous increase lifetime of its luminescence upon adsorption on Zn0.5Cd0.5S quantum dots were found. Addition of methylene blue (thion

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Pollard, Benjamin, and Markus B. Raschke. "Correlative infrared nanospectroscopic and nanomechanical imaging of block copolymer microdomains." Beilstein Journal of Nanotechnology 7 (April 22, 2016): 605–12. http://dx.doi.org/10.3762/bjnano.7.53.

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Intermolecular interactions and nanoscale phase separation govern the properties of many molecular soft-matter systems. Here, we combine infrared vibrational scattering scanning near-field optical microscopy (IR s-SNOM) with force–distance spectroscopy for simultaneous characterization of both nanoscale optical and nanomechanical molecular properties through hybrid imaging. The resulting multichannel images and correlative analysis of chemical composition, spectral IR line shape, modulus, adhesion, deformation, and dissipation acquired for a thin film of a nanophase separated block copolymer (

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Johansen, Ib-Rune, Glenn Terje Lines, Atle Honne, and Tonje Midtgaard. "Calibration of an FT-IR Spectrometer for Ambient Air Monitoring Using PLS." Applied Spectroscopy 51, no. 10 (1997): 1540–46. http://dx.doi.org/10.1366/0003702971939073.

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The objective of this work has been to develop a robust calibration method for simultaneous multigas detection with a Fourier transform infrared (FT-IR) system. Calibration models for the identification and quantification of 23 gases in the presence of high concentrations of background gases such as water vapor, carbon dioxide, and methane have been obtained for an FT-IR instrument with 0.7-cm−1 resolution. The calibration models have been tested on a breadboard instrument for trace gas measurement in manned space missions. The results show that FT-IR combined with multivariate methods such as

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Herklotz, Frank, Tom Rubin, Malte Sinnreich, Alexander Helmke, Theodore von Haimberger, and Karsten Heyne. "Fast Simultaneous CO2 Gas Temperature and Concentration Measurements by Quantum Cascade Laser Absorption Spectroscopy." Applied Sciences 12, no. 10 (2022): 5057. http://dx.doi.org/10.3390/app12105057.

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A quantum cascade laser-based sensing technique is presented which allows for in situ high-precision temperature and/or CO2 concentration measurements of gases in the room temperature regime with sampling rates up to about 40 kHz. The method is based on Boltzmann-like thermally populated fundamental and hot-band rovibrational transitions of CO2 with opposite temperature dependence. Single absorption spectra at about 2350 to 2352 cm−1 are recorded by a nanosecond frequency down chirped IR pulse of a pulsed distributed feedback quantum cascade laser (intrapulse mode). The statistical uncertainty

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Schubert, M. M., T. P. Häring, G. Bräth, H. A. Gasteiger, and R. J. Behm. "New DRIFTS Cell Design for the Simultaneous Acquisition of IR Spectra and Kinetic Data Using On-Line Product Analysis." Applied Spectroscopy 55, no. 11 (2001): 1537–43. http://dx.doi.org/10.1366/0003702011953775.

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A new design for a DRIFTS (diffuse reflectance infrared Fourier transform spectrometry) cell for in situ studies in heterogeneous catalysis is presented, which allows for improved reaction control (i.e., gas flow, temperature, minimized background conversion) and for precise kinetic measurements via on-line gas analysis by a tandem-arranged gas chromatograph. Specifically, the very low background activity of the cell itself for CO and H2 oxidation makes it possible to study the preferential CO oxidation in H2-rich gases (PROX) at relevant reaction temperatures (150–350 °C) and reactant concent

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Liu, Yang, Song Wang, Yong Liang, et al. "Simultaneous removal of methyl orange and Cr(VI) using polyethyleneimine-modified corncob-derived carbon material." BioResources 15, no. 4 (2020): 7342–56. http://dx.doi.org/10.15376/biores.15.4.7342-7356.

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Polyethyleneimine (PEI) modified corncob-derived carbon material (CCM) was prepared by the simple wet-impregnation technique. Field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FT-IR), and nitrogen isothermal adsorption/desorption measurements were used to compare the structural differences between the CCM and the PEI-modified CCM (PEI-CCM). In the single-pollutant removal experiment, the PEI-CCM showed high adsorption capacities for methyl orange (MO) and Cr(VI). However, the CCM only showed high adsorption

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Morzinski, Katie M., Laird M. Close, Jared R. Males, et al. "Direct imaging of Beta Pictoris b with first-light Magellan Adaptive Optics." Proceedings of the International Astronomical Union 8, S299 (2013): 252–56. http://dx.doi.org/10.1017/s1743921313008508.

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AbstractMagAO is the newly-commissioned adaptive optics (AO) instrument on the Magellan Clay telescope at Las Companas Observatory, Chile. MagAO has two co-mounted science cameras: VisAO for visible-light direct and spectral-differential imaging; and Clio for near to thermal IR direct imaging, non-redundant-mask interference, and prism spectroscopy. We demonstrate MagAO's simultaneous visible and infrared AO performance via direct images of exoplanet Beta Pictoris b. The planet was detected in 5 passbands from 0.9–5μm. Here we show the infrared images; the visible observations are presented in

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Aykas, Didem Peren, Karla Rodrigues Borba, and Luis E. Rodriguez-Saona. "Non-Destructive Quality Assessment of Tomato Paste by Using Portable Mid-Infrared Spectroscopy and Multivariate Analysis." Foods 9, no. 9 (2020): 1300. http://dx.doi.org/10.3390/foods9091300.

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This research aims to provide simultaneous predictions of tomato paste’s multiple quality traits without any sample preparation by using a field-deployable portable infrared spectrometer. A total of 1843 tomato paste samples were supplied by four different leading tomato processors in California, USA, over the tomato seasons of 2015, 2016, 2017, and 2019. The reference levels of quality traits including, natural tomato soluble solids (NTSS), pH, Bostwick consistency, titratable acidity (TA), serum viscosity, lycopene, glucose, fructose, ascorbic acid, and citric acid were determined by officia

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