A New Internal Reflection Element Design for High Optical Throughput in FT-IR

1986 ◽  
Vol 40 (5) ◽  
pp. 632-635 ◽  
Author(s):  
Robert G. Messerschmidt
Keyword(s):  
Internal Reflection ◽  
Attenuated Total Reflectance ◽  
Angle Of Incidence ◽  
Simple Design ◽  
Total Reflectance ◽  
Ft Ir ◽  
Ir Analysis

A novel geometry for internal reflection elements is described. These elements have been found most useful in the FT-IR analysis of samples by attenuated total reflectance (ATR). Both single and multiple internal reflection elements are described. These elements provide three basic benefits. First, the geometry is such that an element may be exchanged for another of differing angle of incidence without the need for optical realignment of the sampling accessory. Second, for a given element thickness and width, the design allows a larger aperture over the conventional designs (parallelograms and trapezoids) for angles of incidence greater than 45 degrees, resulting in better sensitivity. Third, the elements are of a simple design, and are easy to fabricate.

scholarly journals Polylactic Acid/Cellulose Fibres Based Composites for Food Packaging Applications

2017 ◽  
Vol 54 (4) ◽  
pp. 673-677 ◽  
Author(s):  
Elisabeta Elena Popa ◽  
Maria Rapa ◽  
Ovidiu Popa ◽  
Gabriel Mustatea ◽  
Vlad Ioan Popa ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Food Packaging ◽  
Attenuated Total Reflectance ◽  
Scanning Calorimetry ◽  
Melt Mixing ◽  
Cellulose Fibres ◽  
Total Reflectance ◽  
Ft Ir ◽  
Ir Analysis ◽  
And Migration

PLA-based composites containing CF in the range 0 to 10 wt. % were prepared by melt mixing technique. The prepared composites were investigated in terms of processability, chemical structure (by Attenuated total reflectance - Fourier Transform Infrared - ATR-FT-IR analysis), thermal (Differential Scanning Calorimetry - DSC), optical properties (using UV-Vis spectrometry), barrier and migration in distilled water. Also, the behaviour of PLA based composites at sterilization was performed by examination the changes in their chemical structure. This study shows the feasibility of improving of PLA properties by using cellulose fibres, designed for flexible food packaging.

scholarly journals Synthesis of epoxy resins derivatives of naphthalene-2,7-diol and their cross-linked products

2019 ◽  
Vol 138 (6) ◽  
pp. 4349-4358 ◽  
Author(s):  
K. Fila ◽  
M. Gargol ◽  
M. Goliszek ◽  
B. Podkościelna
Keyword(s):  
Fourier Transform ◽  
Epoxy Resins ◽  
Attenuated Total Reflectance ◽  
Cross Linking ◽  
Total Reflectance ◽  
Before And After ◽  
Ft Ir ◽  
The Cross ◽  
Derivatives Of ◽  
Epoxy Groups

Abstract The aim of this study was the synthesis of three different epoxy compounds based on naphthalene-2,7-diol (2,7-NAF.EP, 2,7-NAF.WEP, 2,7-NAF.P.EP) and then their cross-linking by triethylenetetramine (TETA). All epoxides were prepared by the reaction of naphthalene-2,7-diol with epichlorohydrin but under different conditions and with other catalysts. The structures of the obtained compounds before and after the cross-linking reactions were confirmed by the attenuated total reflectance Fourier transform infrared spectroscopy (ATR/FT-IR). The ATR/FT-IR spectra of cross-linked compounds show disappearance of the C–O–C bands (about 915 cm−1) derived from the epoxy groups. DSC and TG/DTG measurements indicated that the obtained materials possess good thermal resistance; they are stable up to about 250 °C. The hardness of the cross-linked products was determined using the Shore D method. The highest value of hardness was obtained for the 2,7-NAF.EP-POL. Additionally, the UV–Vis absorption spectra of the obtained polymers were registered and evaluated.

Observations of surface-mediated reduction of Pu(VI) to Pu(IV) on hematite nanoparticles by ATR FT-IR

2015 ◽  
Vol 103 (8) ◽  
Author(s):  
Hilary P. Emerson ◽  
Brian A. Powell
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Attenuated Total Reflectance ◽  
Mineral Surfaces ◽  
Hematite Nanoparticles ◽  
Total Reflectance ◽  
Ft Ir ◽  
First Time ◽  
Mediated Reduction

AbstractPrevious studies have shown that mineral surfaces may facilitate the reduction of plutonium though the mechanisms of the reduction are still unknown. The objective of this study is to use batch sorption and attenuated total reflectance Fourier transform infrared spectroscopy experiments to observe the surface-mediated reduction of plutonium on hematite nanoparticles. These techniques allow for in situ measurement of reduction of plutonium with time and may lead to a better understanding of the mechanisms of surface mediated reduction of plutonium. For the first time, ATR FT-IR peaks for Pu(VI) sorbed to hematite are measured at ∼ 916 cm

scholarly journals Characterization ofBacillus subtilissporulation and bacteriophage infection via FT-IR spectroscopy

2009 ◽  
Vol 23 (3-4) ◽  
pp. 165-174
Author(s):  
Tami H. Mysliwiec ◽  
Anthony F. Tierno ◽  
David J. Aurentz
Keyword(s):  
Spectral Analysis ◽  
Ir Spectroscopy ◽  
Attenuated Total Reflectance ◽  
Wild Type ◽  
Total Reflectance ◽  
Bacteriophage Infection ◽  
Aliphatic Ester ◽  
Cellular Population ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

A comparative analysis on cultures from wild-type and sporulation mutants ofBacillus subtilisinfected with pseudotemperate spore-converting bacteriophages was performed to discern differences in the chemical functionality of the cellular population. Variations in the cell surface chemistry ofB. subtiliscultures were analyzed using attenuated total reflectance (ATR) Fourier transform infrared (FT-IR) spectroscopy of dried sample films on optical plates. Comparison of wild-type and phage infected cultures revealed an increase in the amount of aliphatic ester in the infected populations. Spectral analysis of cultures from bacteriophage infected sporulation mutants,spo0Kandspo0Jrevealed varying levels of ester linkages.

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