scholarly journals Composite materials based on dental acrylic plastic and chitosan

2021 ◽  
Vol 8 (4) ◽  
pp. 20218413
Author(s):  
L. A. Yakovishin ◽  
E. V. Tkachenko
Keyword(s):  
Composite Materials ◽  
Ir Spectroscopy ◽  
Hydrogen Bonds ◽  
Polymer Composites ◽  
Hydrophobic Interactions ◽  
Mechanochemical Method ◽  
Intermolecular Hydrogen Bonds ◽  
Dental Acrylic ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Chitosan and poly(methyl methacrylate) (PMMA) composites were synthesized by polymerization with heating and mechanochemical method. The obtained polymer composites were analyzed by the ATR FT-IR spectroscopy method. The presence of intermolecular hydrogen bonds and hydrophobic interactions in formation of PMMA and chitosan polymer composites was shown.

Rheo-optical FT-IR Spectroscopy of LLDPE: Effect of Comonomer and Composite Materials

2008 ◽  
Vol 265 (1) ◽  
pp. 166-177 ◽  
Author(s):  
M. Plass ◽  
R. Streck ◽  
J. Nieto ◽  
H. W. Siesler
Keyword(s):  
Composite Materials ◽  
Ir Spectroscopy ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

scholarly journals STUDY OF THE POSSIBILITY OF USING IR-SPECTROSCOPY FOR THE IDENTIFICATION OF A VARIETY OF SEA BUCKTHORN FRUIT (НIPPOPHAES RHAMNOIDES L.)

2019 ◽  
pp. 301-308
Author(s):  
Ольга (Ol'ga) Валерьевна (Valer'evna) Тринеева (Trineeva) ◽  
Маргарита (Margarita) Александровна (Aleksandrovna) Рудая (Rudaya) ◽  
Елена (Elena) Федоровна (Fedorovna) Сафонова (Safonova) ◽  
Алексей (Aleksey) Иванович (Ivanovich) Сливкин (Slivkin)
Keyword(s):  
Ir Spectroscopy ◽  
Hydrogen Bonds ◽  
Sea Buckthorn ◽  
Biologically Active ◽  
Absorption Bands ◽  
Specific Frequency ◽  
Ft Ir ◽  
Dry Fruit ◽  
Absorption Frequencies ◽  
Ft Ir Spectroscopy

The purpose of this study was to study the feasibility of using IR spectroscopy (IRS) to identify the fruit of sea buckthorn and buckthorn varieties. Fourier species of sea-buckthorn of buckthorn species studied were analyzed by FT-IR spectroscopy of disturbed total internal reflection (FTIR). IR spectra of sea buckthorn fruits was characterized by the presence of specific absorption bands: for grades «Gallery», «Вotanical», «Trofimovskaya» and «Krasnokarminovaya» in the range 3009-3006; 1456-1443 and 1379-1375 cm-1; for varieties «Rowan», «Botanical amateur» and «Student» in the range of 1338-1321 cm-1; for varieties «Rowan», «Botanical aromatic» and «Krasnokarminovaya» in the range of 1155-1146 cm-1; for varieties «Rowan» and «Krasnokarminovaya» at 914 cm-1; for varieties «Galerit», «Botanicheskaya» and «Krasnokarminovaya» in the range of 609-592 cm-1; for varieties «Trofimovskaya» and «Krasnokarminovaya» at 814-812 cm-1; for the variety «Rowan» at 424 cm-1 and for the variety «Trofimovskaya» at 771 cm-1. The highest intensity in absorption maxima is characteristic for infrared spectra of the fruits of the varieties «Rowan», «Botanical Amateur», «Botanical Aromatic» and «Student». Identified specific frequency in the spectrum can be regarded as characteristic for a particular grade and use them as markers in determining the authenticity and graded supplies dry fruit of sea buckthorn by IR spectroscopy. The formation of hydrogen bonds and their characteristics (size and energy) between molecules of biologically active substances (BAS) in the LRS studied are established. The revealed intermolecular hydrogen bonds belong to the type of strong bonds, since their energy exceeds 5 kcal/mol, and the length is about 2.7 Ǻ. Polyphenolic BAS in fruits, according to the IRS, form polyassociates with characteristic absorption frequencies at 3400-3200 cm-1.

Combination of Sorption Tube Sampling and Thermal Desorption with Hollow Waveguide FT-IR Spectroscopy for Atmospheric Trace Gas Analysis:  Determination of Atmospheric Ethene at the Lower ppb Level

2004 ◽  
Vol 76 (2) ◽  
pp. 464-468 ◽  
Author(s):  
Olga A. Pogodina ◽  
Victor V. Pustogov ◽  
Fabiano de Melas ◽  
Christina Haberhauer-Troyer ◽  
Erwin Rosenberg ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Thermal Desorption ◽  
Gas Analysis ◽  
Trace Gas ◽  
Hollow Waveguide ◽  
Ft Ir ◽  
Atmospheric Trace Gas ◽  
Analysis Determination ◽  
Ft Ir Spectroscopy

Multiscale exploration of hydrocarbons adsorption and hopping through the ZSM-5 channels - from Monte Carlo modelling to experiment

2021 ◽  
Author(s):  
Maciej Strzempek ◽  
Karolina A. Tarach ◽  
Kinga Góra-Marek ◽  
Fernando Rey ◽  
Miguel Palomino ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ir Spectroscopy ◽  
Aliphatic Hydrocarbons ◽  
Adsorption Studies ◽  
Ft Ir ◽  
Gravimetric Adsorption ◽  
Hydrocarbons Adsorption ◽  
Ft Ir Spectroscopy

Abstract In this article the results of the statistical MC modelling corroborated by the FT-IR spectroscopy and gravimetric adsorption studies of the low aliphatic hydrocarbons in ZSM-5 (Si/Al =28 or...

scholarly journals Vibrational Spectroscopic Investigation of Blood Plasma and Serum by Drop Coating Deposition for Clinical Application

2021 ◽  
Vol 22 (4) ◽  
pp. 2191
Author(s):  
Jing Huang ◽  
Nairveen Ali ◽  
Elsie Quansah ◽  
Shuxia Guo ◽  
Michel Noutsias ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Outer Ring ◽  
Imaging Method ◽  
Fluorescence Lifetime Imaging ◽  
Drying Process ◽  
Vibrational Signal ◽  
Coating Deposition ◽  
Ft Ir ◽  
Sample Droplet ◽  
Ft Ir Spectroscopy

In recent decades, vibrational spectroscopic methods such as Raman and FT-IR spectroscopy are widely applied to investigate plasma and serum samples. These methods are combined with drop coating deposition techniques to pre-concentrate the biomolecules in the dried droplet to improve the detected vibrational signal. However, most often encountered challenge is the inhomogeneous redistribution of biomolecules due to the coffee-ring effect. In this study, the variation in biomolecule distribution within the dried-sample droplet has been investigated using Raman and FT-IR spectroscopy and fluorescence lifetime imaging method. The plasma-sample from healthy donors were investigated to show the spectral differences between the inner and outer-ring region of the dried-sample droplet. Further, the preferred location of deposition of the most abundant protein albumin in the blood during the drying process of the plasma has been illustrated by using deuterated albumin. Subsequently, two patients with different cardiac-related diseases were investigated exemplarily to illustrate the variation in the pattern of plasma and serum biomolecule distribution during the drying process and its impact on patient-stratification. The study shows that a uniform sampling position of the droplet, both at the inner and the outer ring, is necessary for thorough clinical characterization of the patient’s plasma and serum sample using vibrational spectroscopy.

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