Journal articles: 'UV-Vis spectroscopy'

1

MASAGO, Hisashi. "UV/Vis spectroscopy." Journal of the Japan Society of Colour Material 78, no. 11 (2005): 531–38. http://dx.doi.org/10.4011/shikizai1937.78.531.

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Burgess, Chris. "UV-VIS spectroscopy." TrAC Trends in Analytical Chemistry 12, no. 7 (August 1993): x. http://dx.doi.org/10.1016/0165-9936(93)87010-u.

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Fernandes, C. D., D. Johnson, J. C. Bridges, and Monica M. Grady. "UV-Vis spectroscopy of stardust." International Journal of Astrobiology 5, no. 4 (October 2006): 287–93. http://dx.doi.org/10.1017/s1473550406003363.

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NASA's Stardust mission flew through the coma of comet Wild 2 in January 2004, capturing dust grains as it did so. The grains were returned safely to Earth in January 2006, and are in the process of being distributed to investigators. As members of the Spectroscopy Preliminary Examination Team, we are preparing to analyse Stardust grains. Our contribution is to measure the spectrum of the grains between 200 nm (in the near ultraviolet) and 800 nm (near infrared). The purpose of the measurement is to provide an additional technique for characterizing the grains, one that is complementary to other spectroscopic techniques and one that produces results that can be matched directly with spectra acquired remotely (with telescope or spacecraft instrumentation). As part of the preparation for analysis of Stardust materials, we are producing a database of spectra from appropriate minerals, and are honing the technique through analysis of primitive meteorites.

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Grinter, R. "UV-VIS spektroskopie und ihre anwendungen (UV-VIS spectroscopy and its appplications)." Spectrochimica Acta Part A: Molecular Spectroscopy 42, no. 11 (January 1986): 1333. http://dx.doi.org/10.1016/0584-8539(86)80237-9.

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Pizarro, C., L. A. Sarabia, and J. López Palacios. "Multivariate calibration in UV-vis spectroscopy." Journal of Chemometrics 3, S1 (March 30, 2005): 241–47. http://dx.doi.org/10.1002/cem.1180030515.

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Okretic, Stefano, and Norbert Nowack. "UV/VIS-spectroscopy of liquid slags." Steel Research 70, no. 8-9 (August 1999): 330–37. http://dx.doi.org/10.1002/srin.199905649.

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Nurani, Laela Hayu, Citra Ariani Edityaningrum, Irnawati Irnawati, Anggita Rosiana Putri, Anjar Windarsih, Any Guntarti, and Abdul Rohman. "Chemometrics-Assisted UV-Vis Spectrophotometry for Quality Control of Pharmaceuticals: A Review." Indonesian Journal of Chemistry 23, no. 2 (March 27, 2023): 542. http://dx.doi.org/10.22146/ijc.74329.

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Spectroscopic method in the UV-Vis region is considered the most molecular spectrometric method for content determination of a single component. However, a lot of pharmaceutical dosage forms comprise two or more components which lead to peak overlapping. Moreover, in the chemical stability test, active pharmaceutical ingredient (API) was also found along with the degradation products, impurities, and adulterant compounds. UV-Vis spectroscopy is one of the methods of choice for the determination or quantification of a single component in pharmaceutical preparations. The pharmaceutical products typically contain two or more APIs having chromophoric agents capable of absorbing UV-Vis beams and the absorbance values are summative from the absorption of each UV-Vis active compound according to the additive nature of Lambert-Beer law. The main problem for the simultaneous determination of API along with impurities and the degradation products in pharmaceutical preparations is the presence of overlapping peaks of UV-Vis spectra. The chemometrics-assisted spectroscopy is one of the analytical efforts to solve these problems. This review highlighted the application of chemometrics in combination with UV-Vis spectroscopy for the assay of API, impurities, adulteration issues and degradation products present in pharmaceutical dosage forms.

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Mäntele, Werner, and Erhan Deniz. "UV–VIS absorption spectroscopy: Lambert-Beer reloaded." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 173 (February 2017): 965–68. http://dx.doi.org/10.1016/j.saa.2016.09.037.

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9

Garrett DeYoung, H. "UV/VIS Spectroscopy: Something Old, Something New." Nature Biotechnology 5, no. 10 (October 1987): 1088–89. http://dx.doi.org/10.1038/nbt1087-1088.

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BJOERNLAND, T. "ChemInform Abstract: UV-VIS Spectroscopy of Carotenoids." ChemInform 28, no. 42 (August 3, 2010): no. http://dx.doi.org/10.1002/chin.199742360.

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Dalal, Aditya, Animesh Mandal, Shubhada Adhi, and Kiran Adhi. "Study on integration of aluminum-doped zinc oxide (AZO) thin films with graphene oxide (GO)." International Journal of Modern Physics B 32, no. 19 (July 18, 2018): 1840044. http://dx.doi.org/10.1142/s0217979218400441.

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Aluminum (0.5 at.%)-doped ZnO (AZO) thin films were deposited by pulsed laser deposition technique (PLD) in oxygen ambient of 10[Formula: see text] Torr. The deposited thin films were characterized by x-ray diffraction (XRD), photoluminescence (PL), Raman spectroscopy and uv–visible spectroscopy (UV–vis). Next, graphene oxide (GO) was synthesized by Hummers method and was characterized by XRD, UV–vis spectroscopy, Raman spectroscopy and transmission electron microscopy (TEM). Thereafter, GO solution was drop-casted on AZO thin films. These films were then characterized by Raman Spectroscopy, UV–vis spectroscopy and PL. Attempt is being made to comprehend the modifications in properties brought about by integration.

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Guo, Yuchen, Chunhong Liu, Rongke Ye, and Qingling Duan. "Advances on Water Quality Detection by UV-Vis Spectroscopy." Applied Sciences 10, no. 19 (September 30, 2020): 6874. http://dx.doi.org/10.3390/app10196874.

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Water resources are closely linked to human productivity and life. Owing to the deteriorating water resources environment, accurate and rapid determination of the main water quality parameters has become a current research hotspot. Ultraviolet-visible (UV-Vis) spectroscopy offers an effective tool for qualitative analysis and quantitative detection of contaminants in a water environment. In this review, the principle and application of UV-Vis technology in water quality detection were studied. The principle of UV-Vis spectroscopy for detecting water quality parameters and the method of modeling and analysis of spectral data were presented. Various UV-Vis technologies for water quality detection were reviewed according to the types of pollutants, such as chemical oxygen demand, heavy metal ions, nitrate nitrogen, and dissolved organic carbon. Finally, the future development of UV-Vis spectroscopy for the determination of water quality was discussed.

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Woo, Sanguk, Hyein Jung, and Yohan Yoon. "Real-Time UV/VIS Spectroscopy to Observe Photocatalytic Degradation." Catalysts 13, no. 4 (March 31, 2023): 683. http://dx.doi.org/10.3390/catal13040683.

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In this work, we have developed a real-time UV/VIS spectroscopy method using a broadband Xenon Arc lamp to detect photocatalytic reactions in real time. A CMOS camera was used instead of an output slit to capture all spectral information simultaneously, which can enable a real-time detection of the UV/VIS absorption of the analytes within a single frame of the camera. To verify real-time spectroscopy, a wavelength calibration process was performed using three laser line filters and a didymium glass filter sample. To demonstrate that this real-time spectroscopic setup can be used for rapid measurements, MB samples were used to observe the real-time photocatalytic degradation of MB by TiO2 nanoparticles. For real-time measurement, four samples with different TiO2 nanoparticle quantities showed different photocatalytic degradation mechanisms. By plotting the spectra every 20 ms, the series of spectra clearly showed the degradation of MB in real time.

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Lähdetie, Anni, Tiina Liitiä, Tarja Tamminen, and Anna-Stiina Jääskeläinen. "Reflectance UV-vis and UV resonance Raman spectroscopy in characterization of kraft pulps." BioResources 4, no. 4 (October 19, 2009): 1600–1619. http://dx.doi.org/10.15376/biores.4.4.1600-1619.

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Reflectance UV-Vis spectroscopy and UV resonance Raman (UVRR) spectroscopy are both nondestructive techniques that are applicable to study trace concentrations of lignin in-situ. In this study, unbleached and bleached softwood kraft pulps were analyzed by reflectance UV-Vis (k/s) and UVRR spectroscopy to follow lignin and hexenuronic acid (HexA) contents and structural changes in residual lignin. The height of the lignin band in the UV-Vis spectra (280 nm) correlated well with the lignin band in the UVRR spectra (1605 cm-1) for semi- or fully-bleached pulps. However, the correlation was much weaker for unbleached pulps. Also the results for hexenuronic acid content by UV-Vis (240 nm) and UVRR (1658 cm-1) methods correlated well for most of the pulps, but for unbleached or peroxide-bleached samples the interference from other structures affecting these bands was obvious.

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Adnan, Adnan, Marcel Naumann, Daniel Mörlein, and Elke Pawelzik. "Reliable Discrimination of Green Coffee Beans Species: A Comparison of UV-Vis-Based Determination of Caffeine and Chlorogenic Acid with Non-Targeted Near-Infrared Spectroscopy." Foods 9, no. 6 (June 16, 2020): 788. http://dx.doi.org/10.3390/foods9060788.

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Species adulteration is a common problem in the coffee trade. Several attempts have been made to differentiate among species. However, finding an applicable methodology that would consider the various aspects of adulteration remains a challenge. This study investigated an ultraviolet–visible (UV-Vis) spectroscopy-based determination of caffeine and chlorogenic acid contents, as well as the applicability of non-targeted near-infrared (NIR) spectroscopy, to discriminate between green coffee beans of the Coffea arabica (Arabica) and Coffea canephora (Robusta) species from Java Island, Indonesia. The discrimination was conducted by measuring the caffeine and chlorogenic acid content in the beans using UV-Vis spectroscopy. The data related to both compounds was processed using linear discriminant analysis (LDA). Information about the diffuse reflectance (log 1/R) spectra of intact beans was determined by NIR spectroscopy and analyzed using multivariate analysis. UV-Vis spectroscopy attained an accuracy of 97% in comparison to NIR spectroscopy’s accuracy by selected wavelengths of LDA (95%). The study suggests that both methods are applicable to discriminate reliably among species.

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Kusumiyati, Kusumiyati, Yuda Hadiwijaya, and Ine Elisa Putri. "Non-Destructive Classification of Fruits Based on Vis-nir Spectroscopy and Principal Component Analysis." Jurnal Biodjati 4, no. 1 (May 28, 2019): 89–95. http://dx.doi.org/10.15575/biodjati.v4i1.4389.

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Fruits are one of the sources of nutrition needed for health. Fruit quality is generally assessed by physical and chemical properties. Measurement of fruit internal quality is usually done by destructive techniques. Ultraviolet, visible and near-infrared (UV-Vis-NIR) spec-troscopy is a non-destructive technique to measure fruit quality. This technique can rapidly measure the fruit quality, the measured fruit still remains intact, and can be marketed. Besides, UV-Vis-NIR spectrosco-py can also be used to classify fruits. The study aimed to classify var-ious types of fruits using UV-Vis-NIR spectroscopy with wavelengths of 300-1041 nm and Principal Component Analysis (PCA). First de-rivative savitzky-golay with 9 smoothing points (dg1) and multiplica-tive scatter correction (MSC) were applied to correct the spectra. The results showed that the use of uv-vis-nir spectroscopy and PCA com-bined with spectra pre-treatment of the MSC method were able to clas-sify various types of fruits with 100% success rate in all fruit samples including sapodilla, ridge gourd, mango, guava, apple and zucchini.

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Rademann, K. "Photoelectron spectroscopy and UV/Vis-photoabsorption spectroscopy of isolated clusters." Zeitschrift f�r Physik D Atoms, Molecules and Clusters 19, no. 1-4 (March 1991): 161–64. http://dx.doi.org/10.1007/bf01448281.

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Şener, Sevil. "Ball-Type Dioxy-o-Carborane Bridged Cobaltphthalocyanine: Synthesis, Characterization and DFT Studies For Dye-Sensitized Solar Cells as Photosensitizer." Heterocyclic Communications 26, no. 1 (March 17, 2020): 37–45. http://dx.doi.org/10.1515/hc-2020-0007.

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AbstractThe synthesis and spectroscopic characterization of an innovative ball-type cobalt metallophthalocyanine 4, bridged by four 1,2-bis(2-hydroxymethyl)-O-carborane (HMOC) 1 units, has been achieved. The synthesized compound 4 was characterized structurally and electronically using elemental analysis, UV-Vis absorption spectroscopy, FT-IR spectroscopy, MALDI-TOF mass spectrometry, EPR spectroscopy and magnetic susceptibility. The photovoltaic performance of the newly synthesized compound in dye-sensitized solar cells was investigated. In order to clarify the effect of dye-sensitization time on photovoltaic performance parameters, the sensitization time was varied from 12 to 60 h and the performance parameters were investigated. It was found that sensitization time had a strong effect on the main performance parameters. The best photovoltaic performance was achieved after sensitization for 36 h (short circuit current density, 5.41 mA cm−2; overall conversion efficiency, 3.42%). Computational UV-Vis absorption spectra of the molecule was calculated using time dependent density functional theory and was found consistent with measured UV-Vis spectra.

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Huang, Jianyin, Christopher W. K. Chow, Zhining Shi, Rolando Fabris, Amanda Mussared, Gary Hallas, Paul Monis, Bo Jin, and Christopher P. Saint. "Stormwater monitoring using on-line UV-Vis spectroscopy." Environmental Science and Pollution Research 29, no. 13 (October 31, 2021): 19530–39. http://dx.doi.org/10.1007/s11356-021-17056-7.

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Moeur, Harriet P., Andrew Zanella, and Thomas Poon. "An Introduction to UV-Vis Spectroscopy Using Sunscreens." Journal of Chemical Education 83, no. 5 (May 2006): 769. http://dx.doi.org/10.1021/ed083p769.

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Felt, Deborah R., Steven L. Larson, and Edward J. Valente. "UV–VIS spectroscopy of 2,4,6-trinitrotoluene-hydroxide reaction." Chemosphere 49, no. 3 (October 2002): 287–95. http://dx.doi.org/10.1016/s0045-6535(02)00283-7.

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Antonov, Liudmil, and Stefan Stoyanov. "Noise Reduction in Second Derivative UV-Vis Spectroscopy." Spectroscopy Letters 29, no. 2 (March 1996): 231–39. http://dx.doi.org/10.1080/00387019608001599.

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Dwisaksana, Andryan, and Tukiran Tukiran. "ANALISIS SPEKTROSKOPI UV-VIS DAN FTIR SENYAWA HASIL ISOLASI DARI EKSTRAK DIKLOROMETANA KULIT BATANG TUMBUHAN JAMBU SEMARANG (SYZYGIUM SAMARANGENSE)." Unesa Journal of Chemistry 10, no. 2 (May 30, 2021): 121–27. http://dx.doi.org/10.26740/ujc.v10n2.p121-127.

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Abstrak. Spektroskopi UV-vis dan FTIR merupakan salah satu teknik dalam penentuan struktur senyawa dari hasil isolasi. Penelitian ini bertujuan untuk menganalisis struktur senyawa hasil isolasi dari ekstrak diklorometana kulit batang tumbuhan Jambu Semarang menggunakan spektroskopi UV-Vis dan FTIR. Teknik isolasi senyawa yang dilakukan meliputi Kromatografi Lapis Tipis, Kromatografi Cair Vakum dan Kromatografi Kolom Gravitasi. Analisis struktur menggunakan spektroskopi UV-Vis didapatkan spektrum dengan puncak pada panjang gelombang maksimal 239 nm yang menunjukkan adanya eksitasi elektron dari π→π* yang biasa terjadi pada senyawa fenolik. Hasil analisis FTIR didapatkan adanya pita serapan pada bilangan gelombang 3542-3401 cm-1 yang menunjukkan regangan gugus OH, 2932-2857 cm-1 menunjukkan regangan gugus C-H alifatik, 877-715 cm-1 menunjukkan adanya gugus C-H aromatik, dan 1463-1378 cm-1 memperlihatkan gugus C=C aromatik. Berdasarkan analisis spektroskopiUV-Vis dan FTIR dan melihat pola serapannya, mengindikasikan bahwa senyawa hasil isolasi adalahsuatu senyawa golongan flavonoid.Kata kunci: Jambu Semarang, Isolasi, UV-Vis, FTIR Abstract. UV-vis and FTIR spectroscopy is one of the technic in determining the structure of compounds from the isolation. This study aimed to analyze the structure of the isolated compound from the dichloromethane extract of the stem bark of Jambu Semarang using UV-vis and FTIR spectroscopy. Compound isolation techniques included Thin Layer Chromatography, Vacuum Liquid Chromatography, and Gravity Column Chromatography. Structural analysis used UV-Vis spectroscopy obtained a spectrum with a peak at a maximum wavelength of 239 nm which indicated the electron excitation of π → π* which is common in phenolic compounds. The results of FTIR analysis showed that there was an absorption band at wave number 3542-3401 cm-1 which showed the OH group strain, 2932-2857 cm-1showed the CH group strain was aliphatic, 877-715 cm-1 indicated the CH aromatic group, and 1463 -1378 cm-1 aromatic C=C group. Based on UV-Vis and FTIR spectroscopy analysis and looking at the absorption pattern, it indicated that the isolated compound was a compound of the flavonoid group.Keywords: Jambu Semarang, Isolation, UV-Vis, FTIR

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DALACHE, CHERIFA, HADJ BENHEBAL, BEDHIAF BENRABAH, AEK AMMARI, ABDELMALEK KHARROUBI, and ABDELHAK LAKHAL. "CADMIUM-DOPED Co3O4 THIN FILMS: SYNTHESIS AND CHARACTERIZATION." Surface Review and Letters 26, no. 01 (January 2019): 1850134. http://dx.doi.org/10.1142/s0218625x18501342.

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This paper contains the results of the structural and spectroscopic characterizations of undoped and Cadmium-doped cobalt oxide thin films with different Co/Cd molar ratios (3%, 5%, 7% and 9%). The nanosized undoped and cadmium-doped Co3O4 thin layers were prepared using sol–gel process and deposited on glass substrates by dip coating. The changes caused by the incorporation of cadmium at different levels of doping have been highlighted by the techniques UV–Visible (UV–Vis) spectroscopy, Infrared (IR) spectroscopy, X-ray diffraction (XRD) measurements, SEM coupled EDX and impedance spectroscopy. From the UV–Vis spectroscopy analysis, it was found that all the films are two direct bandgap energies. The optical transmittance and the bandgap energy decrease with increase in Cd concentration. The XRD spectra confirm the films were polycrystalline with a cubic spinel structure. The results of the impedance spectroscopy show that the equivalent circuit of the synthesized samples is an RC parallel circuit.

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Isaac, R. S. Rimal, G. Sakthivel, and Ch Murthy. "Green Synthesis of Gold and Silver Nanoparticles UsingAverrhoa bilimbiFruit Extract." Journal of Nanotechnology 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/906592.

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We report on rapid one-step green synthesis of gold and silver nanoparticles using fruit extract ofAverrhoa bilimbi Linn. UV-Vis absorption spectroscopy was used to monitor the quantitative formation of gold and silver nanoparticles. The characteristics of the obtained gold and silver nanoparticles were studied using UV-Vis absorption spectroscopy (UV/Vis), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and Energy-dispersive spectroscopy (EDX). UV/Vis spectrum showed Surface Plasmon Resonance (SPR) for both gold and silver nanoparticles at 540 and 420 nm. The EDX spectrum of the solution containing gold and silver nanoparticles confirmed the presence of elemental gold and silver signals. The average diameter of the prepared nanoparticles in solution was about 50–150 nm. Synthesized particles were either hexagonal or rhomboidal in shape. This synthesis approach of gold and silver nanoparticles is cost effective and can be widely used in biological systems. The effect of fruit extract and metal ion concentration was also studied.

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Motan, Gabriela, and Aurel Puia. "Studies of different types of aspirin by spectrophotometric methods." Acta Chemica Iasi 22, no. 2 (December 1, 2014): 155–64. http://dx.doi.org/10.2478/achi-2014-0013.

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Abstract Aspirin (acetylsalicylic acid) is an important anti-inflammatory and analgesic-pyretic drug. FTIR and UV-VIS spectroscopy were used in the present study. Using the FTIR spectroscopy and statistical data analysis the correlation between different types of aspirin was determined. The content of acetylsalicylic acid from the analysed samples was determined by the use of UV-VIS spectroscopy

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Yang, Hai Qing, Wei Qiang Luo, and Wen Jing Wang. "Nondestructive Discrimination of Grape Seed Varieties Using UV-VIS-NIR Spectroscopy and Chemometrics." Applied Mechanics and Materials 236-237 (November 2012): 89–94. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.89.

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Classification of grape seed species is a useful tool to obtain seeds with desired quality traits. This study aimed at rapidly and nondestructively discriminating four varieties of grape seeds using ultra violet, visible and near infrared (UV-VIS-NIR) spectroscopy with wavelength range of 2101100 nm. A hundred twenty grape seed samples were divided for calibration (n=80) and validation (n=40). The spectra were subjected to a principal component analysis (PCA) with the leading 10 principal components (PCs) used to build calibration models. The obtained PCs were treated by linear discriminant analysis (LDA), artificial neural network (ANN) and support vector machine (SVM) to build various discrimination models. Validation results showed that the PC-LDA model developed for the full range of UV-VIS-NIR achieved better performance than those developed for partial wavelengths, i.e. UV, VIS, NIR, UV-VIS, and VIS-NIR. The PC-LDA model with 8 PCs achieved best performance with 100% discrimination accuracy. This experiment suggests that the UV-VIS-NIR spectroscopy coupled with PC-LDA calibration method is promising for the nondestructive discrimination of grape seed varieties.

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Todd, Clifford S., and Xiaoyun Chen. "Chemometric Evaluation of Ultraviolet–Visible (UV–Vis) Spectra for Characterization of Silver Nanowire Diameter and Yield." Applied Spectroscopy 74, no. 2 (November 20, 2019): 204–9. http://dx.doi.org/10.1177/0003702819891060.

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The main tool used for routine screening of silver nanowire diameter and wire-to-particle yield is ultraviolet–visible (UV–Vis) spectroscopy. The normalized absorbance near 500 nm is generally taken to correlate with wire yield (lower absorbance means fewer particles and higher wire yield). The location of the UV–Vis peak near 375 nm is generally believed to correlate with wire diameter. These qualitative assessments are of unknown uncertainty. Improved microscopy-based analysis of wire diameter distribution and wire yield had recently been developed and were used to characterize synthesis products in parallel with UV–Vis data collection. Here we present results of leveraging this quantitative wire yield and diameter distribution data to quantitatively calibrate the UV–Vis methods for characterizing wire diameter and yield. Chemometric analysis was also applied to this UV–Vis data set and resulted in statistically significant models that can predict average wire diameter and wire/particle yield slightly better than the univariate method.

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Maldonado-Luna, Nadja, Sonia Bailón-Ruiz, Myrna Reyes-Blas, and Oscar J. Perales-Perez. "Synthesis and characterization of Se-based nanoparticles as potential generators of reactive oxygen species." MRS Advances 4, no. 07 (2019): 419–24. http://dx.doi.org/10.1557/adv.2019.137.

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ABSTRACTThis work presents the synthesis of selenium-based nanoparticles via microwave-assisted heating and their subsequent characterization using UV-vis Spectroscopy (UV-Vis), high-resolution transmission electron microscopy (HRTEM), and energy-dispersive X-ray spectroscopy (EDX), techniques. Ongoing research includes the study of the nanoparticles capacity to generate reactive oxygen species (ROS).

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Antonov, Liudmil, and Stefan Stoyanov. "Analysis of the Overlapping Bands in UV-Vis Absorption Spectroscopy." Applied Spectroscopy 47, no. 7 (July 1993): 1030–35. http://dx.doi.org/10.1366/0003702934415264.

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The analysis of the overlapped bands in UV-Vis absorption spectroscopy provides valuable information about the structure of the molecule and its environment. The resolution of individual bands in the UV-Vis region is a complicated task since the absorption bands are generally strongly overlapped, they have different half-band widths, and their number is difficult to estimate. In the present study the possibilities of using Levenberg's method for analysis of overlapping bands in UV-Vis spectroscopy are discussed, and a logical algorithm for their resolution is developed. This approach is applied to the analysis of the vibrational structured long-wavelength bands of trans-stilbene and its derivatives.

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Sharif, Mehwish, Sohail Chand, Syed Azhar Ali Shah Tirmazi, Umar Farooq, Muhammad Makshoof Athar, and Madeeha Batool. "Investigation and Discrimination of Ballpoint Pen Inks by Analytical Techniques and Chemometrics." International Journal of Analytical Chemistry 2022 (August 12, 2022): 1–13. http://dx.doi.org/10.1155/2022/7450539.

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A population study has been performed for Pakistani ballpoint pen inks of blue, black, red, and green colors (a total of four colors) commercially used in Pakistan. Ballpoint pen inks have been investigated and discriminated by using UV/Vis spectroscopy and FTIR spectroscopy. We have calculated and compared the results in terms of discriminating power (DP). The statistical techniques of principal component analysis and cluster analysis have been applied on obtained data. By visual comparison, the best DP is obtained for green ballpoint pen inks, i.e., 0.866 by using UV/Vis spectroscopy and FTIR techniques. Black and red ballpoint pen inks showed the highest DPs by using UV/Vis spectroscopy; however, blue ballpoint pen inks got the highest DP by using FTIR spectroscopy. DP has been improved by using chemometric techniques and higher DPs are obtained as compared to visual examination.

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Pena-Pereira, Francisco, Isabel Costas-Mora, Vanesa Romero, Isela Lavilla, and Carlos Bendicho. "Advances in miniaturized UV-Vis spectrometric systems." TrAC Trends in Analytical Chemistry 30, no. 10 (November 2011): 1637–48. http://dx.doi.org/10.1016/j.trac.2011.04.018.

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Roy, Kanak, Subhadeep Saha, Biswajit Datta, Lovely Sarkar, and Mahendra Nath Roy. "Study on Host-Guest Inclusion Complexation of a Drug in Cucurbit [6]uril." Zeitschrift für Physikalische Chemie 232, no. 2 (February 23, 2018): 281–93. http://dx.doi.org/10.1515/zpch-2017-0003.

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AbstractAssembly of pyridine-2-aldoxime drug with cucurbit [6]uril (CB[6]) has been investigated by1H-NMR and 2D-ROESY NMR, UV-Vis spectroscopy, FT-IR spectroscopy, surface tension and conductivity measurements in aqueous saline environment. The distinct cationic receptor feature and the cavity dimension of the CB[6] emphasize that the macro-cyclic host molecule remain as complex with the nerve stimulus drug molecule. The results obtained from surface tension and specific conductivity measurements suggest 1:1 inclusion complex formation between drug and CB[6]. The stability constant evaluated by UV-Vis spectroscopic approach is 2.21×105M−1at 298.15 K, which indicates that the complex is sufficiently stable at physiological temperature.

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Drašnar, Petr, Michal Zoubek, Petr Chábera, Jiří Havel, and Petr Hlavín. "Contactless Detection of Contaminants by UV-VIS Luminescence Spectroscopy." Materials Science Forum 952 (April 2019): 323–29. http://dx.doi.org/10.4028/www.scientific.net/msf.952.323.

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Some modern methods of surface contamination detection use the principle of luminescence for their function. This thesis aims at introducing the principle of the method that is available for the measurement of surface contamination, thesis deals with an innovative surface-detection device using UV-VIS luminescence spectroscopy. In the work is presented the industrial use of the detection of oil contaminants. Another specialized topic is the field of forensic practice - dactyloscopy, where the possible use of the principle of UV-VIS luminescence spectroscopy, the Recognoil device as a possible and effective method of ensuring dactyloscopic traces is proved.

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Suhandy, Diding, and Meinilwita Yulia. "Luwak Coffee Classification Using UV-Vis Spectroscopy Data: Comparison of Linear Discriminant Analysis and Support Vector Machine Methods." Aceh International Journal of Science and Technology 7, no. 2 (August 13, 2018): 115–21. http://dx.doi.org/10.13170/aijst.7.2.8972.

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UV-Vis spectroscopy has been used as a promising method for coffee quality evaluation including in authentication of several high-economic coffee types. In this paper, we have compared the abilities of linear discriminant analysis (LDA) and support vector machines classification (SVMC) methods for Luwak coffee classification. UV-Vis spectral data of 50 samples of pure Luwak coffee and 50 samples of pure non-Luwak coffee were acquired using a UV-Vis spectrometer in transmittance mode. The results show that UV-Vis spectroscopy combined with LDA and SVMC was an effective method to classify Luwak and non-Luwak coffee samples. The classification result was acceptable and yielded 100% classification accuracy for both LDA and SVMC methods. However, due to the simplicity and volume of the required calculation, in this present study LDA method is superior to SVMC method.

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Tran, Thi Hue, Quoc Toan Tran, Thi Thao Ta, and Si Hung Le. "Geographical origin identification of teas using UV-VIS spectroscopy." E3S Web of Conferences 265 (2021): 05013. http://dx.doi.org/10.1051/e3sconf/202126505013.

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In this work we proposed a method to verify the differentiating characteristics of simple tea infusions prepared in boiling water alone, which represents the final product as ingested by the consumers. For this purpose, total of 125 tea samples from different geographical provines of Vietnam have been analyzed in UV-Vis spectroscopy associated with multivariate statistical methods. Principal Component Analysis-Discriminant Analysis (PCA-DA), Partial Least Squares Discriminant Analysis (PLS-DA) and Artificial Neural Network (ANN) were compared to construct the identification model. The experimental results showed that the performance of ANN model was better than PCA-DA and PLS-DA model. The optimal ANN model was achieved when neuron numbers were 200, identification rate being 99% in the training set and 84% predition set. The proposed methodology provides a simpler, faster and more affordable classification of simple tea infusions, and can be used as an alternative approach to traditional tea quality evaluation.

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Salyacheewin, C., N. Monarumit, and W. Wongkokua. "Luster measurement of pearl by UV-Vis reflectance spectroscopy." Journal of Physics: Conference Series 2145, no. 1 (December 1, 2021): 012063. http://dx.doi.org/10.1088/1742-6596/2145/1/012063.

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Abstract Pearl is an organic gem with its unique color and luster. One of the factors determining the quality and price of pearl is the luster. The different luster of pearls could be related to the different phase structures such as aragonite, calcite and vaterite. Previously, a gloss meter has been developed to measure light specularly reflected at 45° to the surface normal. Six different visual criteria for measuring gloss have been determined. Luster, a type of gloss, was defined as the ratio of specularly reflected light and that diffusely reflected normal to the surface. In practice, luster may be interpreted as relative brightness of specularly and diffusely reflecting areas. Due to the roundness of pearl, we measured the luster of pearl samples by a portable UV-Vis spectrophotometer with an integrating sphere. The luster could be calculated from the difference of CIELAB lightness measured by SCI and SCE geometries.

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Amendola, Vincenzo, and Moreno Meneghetti. "Size Evaluation of Gold Nanoparticles by UV−vis Spectroscopy." Journal of Physical Chemistry C 113, no. 11 (February 24, 2009): 4277–85. http://dx.doi.org/10.1021/jp8082425.

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Jaworska, Maria, and Zofia Stasicka. "Structure and UV–Vis spectroscopy of nitrosylthiolatoferrate mononuclear complexes." Journal of Organometallic Chemistry 689, no. 9 (May 2004): 1702–13. http://dx.doi.org/10.1016/j.jorganchem.2004.02.031.

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Schoonheydt, Robert A. "UV-VIS-NIR spectroscopy and microscopy of heterogeneous catalysts." Chemical Society Reviews 39, no. 12 (2010): 5051. http://dx.doi.org/10.1039/c0cs00080a.

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Meinrath, G. "Chemometric analysis: Uranium(VI) hydrolysis by UV-Vis spectroscopy." Journal of Alloys and Compounds 275-277 (July 1998): 777–81. http://dx.doi.org/10.1016/s0925-8388(98)00439-3.

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Palmer, Sara J., B. Jagannadha Reddy, and Ray L. Frost. "Characterisation of red mud by UV–vis–NIR spectroscopy." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 71, no. 5 (January 2009): 1814–18. http://dx.doi.org/10.1016/j.saa.2008.06.038.

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Jones, Dianna G. "Photodiode Array Detectors in UV-VIS Spectroscopy: Part I." Analytical Chemistry 57, no. 9 (August 1985): 1057A—1073A. http://dx.doi.org/10.1021/ac00286a783.

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Jones, Dianna G. "Photodiode Array Detectors in UV-VIS Spectroscopy: Part II." Analytical Chemistry 57, no. 11 (September 1985): 1207A—1214A. http://dx.doi.org/10.1021/ac00288a809.

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Cuylle, Steven H., Harold Linnartz, and John D. Thrower. "UV/Vis spectroscopy of C60 embedded in water ice." Chemical Physics Letters 550 (October 2012): 79–82. http://dx.doi.org/10.1016/j.cplett.2012.08.072.

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Ivanova, М. А., Е. K. Nefyodova, Е. М. Maltseva, А. V. Kalenskii, and А. А. Zvekov. "STUDY OF ADRENALIN AUTOOXIDATION WITH UV-VIS SPECTROSCOPY METHODS." Journal of Applied Spectroscopy 89, no. 5 (September 21, 2022): 701–8. http://dx.doi.org/10.47612/0514-7506-2022-89-5-701-708.

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The process of adrenaline autoxidation in an alkaline medium (pH=10.65) in the presence of sulfite was experimentally studied by UV-Vis spectroscopy. The absorption spectra of the final product of autoxidation (λm = 290—300 nm, εm = 8400 М–1 · cm–1 ), the intermediate adduct of adrenochrome with sulfite (λm = 343 nm, εm= 68000 М–1 · cm–1), and the reactive an intermediate product, presumably adrenolutin (λm = 311, εm = 140000 М–1 · cm–1 and λm = 373 nm, εm = 129000 М–1 · cm–1) were determined with experimental data processing. The estimated equilibrium constant for the formation of adrenochrome adduct with sulfite 5000 M-1 agrees with the literature data for carbonyl compounds. The results obtained explain the contradictions in the results of various authors concerning the oxidation and autoxidation of adrenaline in an alkaline medium.

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Li, Xinyue, Mizuki Tsuta, Fukuyo Tanaka, Masatoshi Tsukahara, and Keiko Tsukahara. "Assessment of Japanese Awamori Spirits Using UV–VIS Spectroscopy." Food Analytical Methods 13, no. 3 (December 18, 2019): 726–34. http://dx.doi.org/10.1007/s12161-019-01692-4.

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Rubia-Payá, Carlos, Gustavo de Miguel, María T. Martín-Romero, Juan J. Giner-Casares, and Luis Camacho. "UV–Vis Reflection–Absorption Spectroscopy at air–liquid interfaces." Advances in Colloid and Interface Science 225 (November 2015): 134–45. http://dx.doi.org/10.1016/j.cis.2015.08.012.

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Li, Tingting, Hongxia Yan, Tianye Liu, Chao Liu, and Zhengyan Chen. "Carbon Nanotubes Grafted with Hyperbranched Triazine Compounds." Nano 10, no. 01 (January 2015): 1550012. http://dx.doi.org/10.1142/s1793292015500125.

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In order to improve the dispersibility of carbon nanotubes (CNTs) in the resin matrix, CNTs grafted with hyperbranched triazine compound (HPTC–CNTs) was produced by four generations condensation reaction using cyanuric chloride and hexamethylenediamine. Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), UV-Vis spectroscopy (UV-Vis) and transmission electron microscopes (TEM) were used to characterize the obtained HPTC–CNTs. The FTIR, XPS, UV-Vis and TEM analysis showed that CNTs had been successfully grafted with HPTC. The TGA showed that the content of HPTC on the surface of CNTs was about 58 wt.%. And the HPTC–CNTs had good dispersion both in water and acetone.

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Burns, D. Thorburn. "UV-VIS-Spektroskopie und ihre Anwendungen." Analytica Chimica Acta 186 (1986): 352. http://dx.doi.org/10.1016/s0003-2670(00)81826-7.

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Journal articles on the topic 'UV-Vis spectroscopy'

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