scholarly journals Investigation of Petroleum Bitumen Resistance to Aging

2021 ◽  
Vol 15 (3) ◽  
pp. 438-442
Author(s):  
Oleg Grynyshyn ◽  
◽  
Myroslava Donchenko ◽  
Yurii Khlibyshyn ◽  
Olga Poliak ◽  
...  
Keyword(s):  
Thin Film ◽  
Infrared Spectroscopy ◽  
Structural Composition ◽  
Petroleum Bitumen

Aging peculiarities of paving bitumen, which was obtained by different ways, have been studied. Oxidized and residual bitumen produced from oils of Ukrainian deposits were used and the changes in the main characteristics of bitumen after 5 and 10 h of aging in a thin film at the temperature of 436 K have been determined and the processes occurred during the aging have been studied. Using infrared spectroscopy, the changes in the structural composition of the binder during aging have been analyzed.

scholarly journals Grazing-angle reflectivity setup for the low-temperature infrared spectroscopy of two-dimensional systems

2019 ◽  
Vol 26 (6) ◽  
pp. 1945-1950
Author(s):  
Marine Verseils ◽  
Alexandre Voute ◽  
Benjamin Langerome ◽  
Maxime Deutsch ◽  
Jean-Blaise Brubach ◽  
...  
Keyword(s):  
Thin Film ◽  
Infrared Spectroscopy ◽  
Synchrotron Radiation ◽  
Low Temperature ◽  
Ultrathin Films ◽  
Grazing Angle ◽  
Grazing Incidence ◽  
Two Dimensional ◽  
Electron Systems ◽  
Dimensional Electron

A new optical setup is described that allows the reflectivity at grazing incidence to be measured, including ultrathin films and two-dimensional electron systems (2DES) down to liquid-helium temperatures, by exploiting the Berreman effect and the high brilliance of infrared synchrotron radiation. This apparatus is well adapted to detect the absorption of a 2DES of nanometric thickness, namely that which forms spontaneously at the interface between a thin film of LaAlO3 and its SrTiO3 substrate, and to determine its Drude parameters.

scholarly journals Effect of Time and Temperature on the Aging of 791-H SBS Modifier

2018 ◽  
Vol 206 ◽  
pp. 03006
Author(s):  
Christian Magloire Ndjegwes ◽  
Mouhamed Bayane Bouraima ◽  
Xiao-hua Zhang ◽  
Martin Bitolog ◽  
Yanjun Qiu
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Chemical Composition ◽  
Aging Time ◽  
Aging Temperature ◽  
Visual Observation ◽  
Temperature Level ◽  
Oxidative Aging

The effects of time and temperature level on the aging of the 791-H SBS modifier have been investigated through experimental study. A series of Thin Film Oven (TFO) Test was conducted at the temperature of 100°C and 163°C and time of 1, 2, 5 and 10h. The changes in the chemical composition due to oxidative aging are detected by Fourier Transform Infrared Spectroscopy (FTIR) test. The results show that the visual observation of SBS after aging within 10h is almost unchanged when the aging temperature is 100°C. At 163°C within 1-2h aging, the SBS particles gradually softened and become slightly bonded to each other; at the same temperature after 5h of aging, the particles of SBS became yellow. The result from FTIR test shows that temperature is an important factor in the aging of SBS modifier and its effect on the aging of SBS modifier is much greater than that of aging time.

DETECTION AND DIFFERENTIATION OF SPORE AND VEGETATIVE FORMS OF BACILLUS SPP. USING INFRARED SPECTROSCOPIC METHODS

2008 ◽  
Vol 18 (02) ◽  
pp. 417-427
Author(s):  
DIANE ST. AMANT ◽  
MARK CAMPBELL ◽  
ANDREW BECK ◽  
LESLIE WILLIAMS ◽  
JENNIFER MINTER ◽  
...  
Keyword(s):  
Thin Film ◽  
Infrared Spectroscopy ◽  
Attenuated Total Reflection ◽  
Bacillus Species ◽  
Infrared Spectrometry ◽  
Limited Information ◽  
Transmission Method ◽  
Vegetative Cells ◽  
Bacillus Spp ◽  
Bacillus Spores

Infrared spectroscopy has been demonstrated as a powerful tool for taxonomic classification of bacteria when the microbes are grown and sampled under carefully controlled conditions. Infrared spectroscopy affords limited information about relative proportions of certain chemical functional groups in whole microbial cells. The objective of this work is to elucidate the ability of infrared spectroscopy to identify and speciate Bacillus spp. regardless of sample history. Spectrometers utilize different scanning methods to collect infrared absorption spectra. We employed three; transmission through a thin film, transmission infrared microscopy, and Attenuated Total Reflection (ATR). Target organisms include Bacillus anthracis, and several near neighbors. Each strain was cultured at 24°C and 35°C on three solid media. Microorganisms were incubated for up to ten days to include vegetative cells, spore formation and mature spores. Triplicate microbe samples were prepared and analyzed according to instrument requirements using the three measurement modes. Triplicate samples of BSL-3 organisms were analyzed only by the thin film transmission method. Spectral data was analyzed using the cluster analysis function of OPUS software. We report that infrared spectrometry is capable of discerning Bacillus spores from vegetative cells and the phylogenic clustering of Bacillus species according to pathogenicity levels via infrared spectral analysis.

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