Selenopentathionic and Telluropentathionic Acids as Precursors for Formation of Semiconducting Layers on the Surface of Polyamide

The layers of copper chalcogenides, which were formed on the surface of semihydrophilic polymer—polyamide 6 (PA) using monoselenopentathionicH2SeS4O6and monotelluropentathionicH2TeS4O6acids as precursors of chalcogens, were characterized. Fourier transform infrared (FT-IR) and UV spectroscopy were used to monitor the effect of chalcogens on the changes in structure of PA corresponding to the concentration of the precursor's solution and an exposure time. The IR spectra of modified PA were completely different from that of the initial PA. Further interaction of chalcogenized PA with copper (II/I) salt solution leads to the formation ofCuxS,CuxSe,CuxTe,and mixed –CuxS–CuySeandCuxS–CuyTelayers which have different electric transport properties. The surface properties of PA after treatment are studied using AFM and XRD. The electrical resistances of layers with various composition formed over a wide concentration range 0.01–0.5mol⋅dm−3of precursor's solution were measured. Variation in the conductivity of layers of Cu–Se–S and Cu–Te–S on the surface of PA shows an evident increase with the increasing of the mass fraction of selenium or tellurium.

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Application of Fourier Transform Infrared Spectroscopy and Chemometrics for Differentiation of Salmonella enterica Serovar Enteritidis Phage Types

Applied and Environmental Microbiology ◽

10.1128/aem.01589-09 ◽

2010 ◽

Vol 76 (11) ◽

pp. 3538-3544 ◽

Cited By ~ 43

Author(s):

Ornella Preisner ◽

Raquel Guiomar ◽

Jorge Machado ◽

JosÃ¯Â¿Â½ Cardoso Menezes ◽

JoÃ¯Â¿Â½o Almeida Lopes

Keyword(s):

Fourier Transform ◽

Ir Spectra ◽

Salmonella Enterica ◽

Intact Cell ◽

Phage Type ◽

Fourier Transform Infrared ◽

Intact Cells ◽

Phage Types ◽

Ft Ir ◽

Ir Analysis

ABSTRACT Fourier transform infrared (FT-IR) spectroscopy and chemometric techniques were used to discriminate five closely related Salmonella enterica serotype Enteritidis phage types, phage type 1 (PT1), PT1b, PT4b, PT6, and PT6a. Intact cells and outer membrane protein (OMP) extracts from bacterial cell membranes were subjected to FT-IR analysis in transmittance mode. Spectra were collected over a wavenumber range from 4,000 to 600 cm−1. Partial least-squares discriminant analysis (PLS-DA) was used to develop calibration models based on preprocessed FT-IR spectra. The analysis based on OMP extracts provided greater separation between the Salmonella Enteritidis PT1-PT1b, PT4b, and PT6-PT6a groups than the intact cell analysis. When these three phage type groups were considered, the method based on OMP extract FT-IR spectra was 100% accurate. Moreover, complementary local models that considered only the PT1-PT1b and PT6-PT6a groups were developed, and the level of discrimination increased. PT1 and PT1b isolates were differentiated successfully with the local model using the entire OMP extract spectrum (98.3% correct predictions), whereas the accuracy of discrimination between PT6 and PT6a isolates was 86.0%. Isolates belonging to different phage types (PT19, PT20, and PT21) were used with the model to test its robustness. For the first time it was demonstrated that FT-IR analysis of OMP extracts can be used for construction of robust models that allow fast and accurate discrimination of different Salmonella Enteritidis phage types.

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Observation of the Tribo-Film Formation Derived from ZnDTP by Using FT-IR

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.642.259 ◽

2015 ◽

Vol 642 ◽

pp. 259-263

Author(s):

Hirotomo Watanabe ◽

Chiharu Tadokoro ◽

Shinya Sasaki

Keyword(s):

Fourier Transform ◽

Ir Spectra ◽

Photoelectron Spectroscopy ◽

Film Formation ◽

Intensity Change ◽

Friction Behavior ◽

Absorption Bands ◽

X Ray ◽

Sliding Surfaces ◽

Ft Ir

To understand the effects of tribo-film formation derived from ZnDTP (zinc dialkyl ditio phosphate) on friction behavior, friction tests were carried out with varying sliding time. The sliding surfaces were analyzed using Fourier transform infrared spectroscopy (FT-IR) and X-ray Photoelectron Spectroscopy (XPS). On the basis of the surface analytical results of the tribo-film, the absorption bands in the region of 1300-1000 cm-1 assigned as polyphosphate appeared in all IR spectra after the sliding. The friction behavior of ZnDTP was related to the intensity change of the IR spectra peak at 1200 cm-1.

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Classification of Five Kinds of Moss Plants with the Use of Fourier Transform Infrared Spectroscopy and Chemometrics

Spectroscopy An International Journal ◽

10.1155/2011/908150 ◽

2011 ◽

Vol 25 (6) ◽

pp. 271-285 ◽

Cited By ~ 4

Author(s):

Tao Hu ◽

Wen-Ying Jin ◽

Cun-Gui Cheng

Keyword(s):

Cluster Analysis ◽

Fourier Transform ◽

Infrared Spectroscopy ◽

Ir Spectroscopy ◽

Ir Spectra ◽

Fourier Transform Infrared Spectroscopy ◽

Moss Species ◽

Ft Ir ◽

And Cluster Analysis ◽

Ft Ir Spectroscopy

Fourier transform infrared spectroscopy (FT-IR) with Horizontal Attenuated Total Reflectance (HATR) techniques is used to obtain the FT-IR spectra of five kinds of mosses, such asPtychomitrium dentatum(Mitt.) Jaeg.,Ptychomitrium polyphylloides(C. Muell.) Par.,Ptychomitrium sinense(Mitt.) Jaeg.,Macromitrium syntrichophyllumTher. Etp. Vard., andMacromitrium ferrieiCard. Sz Ther. Based on the comparison of the above mosses in the FT-IR spectra, the region ranging from 4000 to 650 cm−1was selected as the characteristic spectra for analysis. Principal component analysis (PCA) and cluster analysis are considered to identify the five moss species. Because they belong to the homogeneous plants, and have similar chemical components and close FT-IR spectroscopy, PCA and cluster analysis can only give a rough result of classification among the five moss species, Fourier self-deconvolution (FSD) and discrete wavelet transform (DWT) methods are used to enhance the differences between them. We use these methods for further study. Results show that it is an excellent method to use FT-IR spectroscopy combined with FSD and DWT to classify the different species in the same family. FT-IR spectroscopy combined with chemometrics, such as FSD and DWT, can be used as an effective tool in systematic research of bryophytes.

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Fabrication and Evaluation of Thermally Crosslinked Gantrez S-97 Microneedle Arrays

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.859.39 ◽

2020 ◽

Vol 859 ◽

pp. 39-44

Author(s):

Yin Yin Myat ◽

Nway Nway Aung ◽

Tanasait Ngawhirunpat ◽

Theerasak Rojanarata ◽

Praneet Opanasopit ◽

...

Keyword(s):

Drug Delivery ◽

Fourier Transform ◽

Infrared Spectroscopy ◽

Ir Spectra ◽

Transdermal Drug Delivery ◽

Thermal Process ◽

Swelling Properties ◽

Digital Microscope ◽

Ft Ir ◽

Microneedle Arrays

The aim of this study was to develop a thermal crosslinkable microneedle (MN) array. Gantrez S-97 was employed as the MN-forming polymer. The MNs were successfully fabricated by micromolding method. The MNs were thermally crosslinked at different times (0.5, 1, 2, 3 h) and temperatures (110, 130, 150°C). The morphology of the MN was observed using a digital microscope. The successful crosslink was confirmed by Fourier transform infrared spectroscopy. The percentages of swelling and MN remaining after being soaked in water were also investigated. Fully formed, sharped MN with desirable morphology was obtained at the Gantrez S-97 concentration of 30 %w/v. The FT-IR spectra confirmed the successful crosslink of the MN. The crosslinked Gantrez MN arrays could absorb massive amount of water, and exhibited excellent swelling capability. Increasing the crosslinking time and temperature resulted in the decrease in the swelling capability but increase in the water insolubilization. The MNs crosslinked at 150°C for 3 h demonstrated almost hundred percent of water insolubilization which desirable for developing hydrogel-forming MN. Therefore, 30% w/v Gantrez S-97 MN could be crosslinked by thermal process, and could provide desirable swelling properties and percentage of water insolubility, and therefore, may be an alternative for fabrication of hydrogel-forming MN for transdermal drug delivery.

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Application of Fourier Transform Infrared Spectroscopy in Quantitation of Trierucin in High-Erucic-Acid Rapeseed Oils

Applied Spectroscopy ◽

10.1366/0003702981944634 ◽

1998 ◽

Vol 52 (7) ◽

pp. 990-993 ◽

Cited By ~ 5

Author(s):

M. Khalique Ahmed ◽

Jim Daun ◽

Doug Declercq

Keyword(s):

Fourier Transform ◽

Ir Spectra ◽

Erucic Acid ◽

Ir Spectrum ◽

Fourier Transform Infrared ◽

Brassica Napus L ◽

Crambe Abyssinica ◽

High Erucic Acid ◽

Ft Ir ◽

Hear Oil

Development of varieties of high-erucic-acid (HEAR) rapeseed with high levels of erucic acid (C22:1) would be valuable for use in oleochemical feedstocks. As an aid to this breeding effort, a rapid method to detect trierucin (C22:1 triacylglycerol), an indicator that erucic acid is being incorporated in all three positions of the triacylglycerol, would be useful. Fingerprint (1850–600 cm−1) Fourier transform infrared (FT-IR) spectra of HEAR oil extracted from Brassica napus L. cv. Mercury, trierucin, and varying amounts of trierucin spiked in this oil were recorded. The regions of 1790–1690 cm−1 and 1485–990 cm−1 were subjected to a partial least-squares (PLS) procedure to obtain a calibration equation [ R2 = 0.992 and root-mean-squared deviation (RMSD) = 2.78]. The established calibration was then tested on the spectra of mixtures of another HEAR oil from B. napus cv. Turret and trierucin. The predicted values differ from the actual values with an RMSD of 1.6%. The calibration was also tested on high-erucic-acid oils from crambe ( Crambe abyssinica) and nasturtium ( Tropaeolum majus L.) seeds. For crambe, the value found (0.4%) was close to that reported in the literature, while the value of 75% for nasturtium oil was close to the value for total triacylglycerols with erucic acid in the 2-position as reported in the literature. FT-IR spectra of triolein (C18: 1 triacylglycerol), trieicosenoin (C20:1 triacylglycerol), and trinervonin (C24:1 triacylglycerol) compared with the FT-IR spectrum of trierucin revealed the uniqueness of IR spectrum of trierucin that forms the basis of PLS analysis of trierucin in HEAR oils.

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Method of Spectral Subtraction of Gas-Phase Fourier Transform Infrared (FT-IR) Spectra by Minimizing the Spectrum Length

Applied Spectroscopy ◽

10.1366/11-06281 ◽

2011 ◽

Vol 65 (8) ◽

pp. 918-923 ◽

Cited By ~ 15

Author(s):

Denis Kozlov ◽

Alexey Besov

Keyword(s):

Fourier Transform ◽

Ir Spectra ◽

Gas Phase ◽

Fourier Transform Infrared ◽

Spectral Subtraction ◽

Ft Ir

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Protein hydration in living cells probed by Fourier transform infrared (FT-IR) spectroscopic imaging

The Analyst ◽

10.1039/c7an00337d ◽

2017 ◽

Vol 142 (13) ◽

pp. 2475-2483 ◽

Cited By ~ 13

Author(s):

H. Shinzawa ◽

B. Turner ◽

J. Mizukado ◽

S. G. Kazarian

Keyword(s):

Fourier Transform ◽

Ir Spectra ◽

Spectroscopic Imaging ◽

Fourier Transform Infrared ◽

Living Cells ◽

Protein Hydration ◽

Ft Ir ◽

Ir Spectroscopic

FT-IR spectra of a HEK cell were analyzed with 2D disrelation mapping to reveal molecular states of water and protein hydration.

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On the Identification of Rayon/Viscose as a Major Fraction of Microplastics in the Marine Environment: Discrimination between Natural and Manmade Cellulosic Fibers Using Fourier Transform Infrared Spectroscopy

Applied Spectroscopy ◽

10.1177/0003702816660725 ◽

2016 ◽

Vol 71 (5) ◽

pp. 939-950 ◽

Cited By ~ 60

Author(s):

Ionela Raluca Comnea-Stancu ◽

Karin Wieland ◽

Georg Ramer ◽

Andreas Schwaighofer ◽

Bernhard Lendl

Keyword(s):

Cluster Analysis ◽

Fourier Transform ◽

Ir Spectra ◽

Fiber Type ◽

Major Fraction ◽

Library Search ◽

Cellulosic Fibers ◽

Ft Ir ◽

Atr Spectroscopy ◽

Acquisition Method

This work was sparked by the reported identification of man-made cellulosic fibers (rayon/viscose) in the marine environment as a major fraction of plastic litter by Fourier transform infrared (FT-IR) transmission spectroscopy and library search. To assess the plausibility of such findings, both natural and man-made fibers were examined using FT-IR spectroscopy. Spectra acquired by transmission microscopy, attenuated total reflection (ATR) microscopy, and ATR spectroscopy were compared. Library search was employed and results show significant differences in the identification rate depending on the acquisition method of the spectra. Careful selection of search parameters and the choice of spectra acquisition method were found to be essential for optimization of the library search results. When using transmission spectra of fibers and ATR libraries it was not possible to differentiate between man-made and natural fibers. Successful differentiation of natural and man-made cellulosic fibers has been achieved for FT-IR spectra acquired by ATR microscopy and ATR spectroscopy, and application of ATR libraries. As an alternative, chemometric methods such as unsupervised hierarchical cluster analysis, principal component analysis, and partial least squares-discriminant analysis were employed to facilitate identification based on intrinsic relationships of sample spectra and successful discrimination of the fiber type could be achieved. Differences in the ATR spectra depending on the internal reflection element (Ge versus diamond) were observed as expected; however, these did not impair correct classification by chemometric analysis. Moreover, the effects of different levels of humidity on the IR spectra of natural and man-made fibers were investigated, too. It has been found that drying and re-humidification leads to intensity changes of absorption bands of the carbohydrate backbone, but does not impair the identification of the fiber type by library search or cluster analysis.

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