Generation of Synthetic Background Spectra by Filtering the Sample Interferogram in FT-IR

1998 ◽  
Vol 52 (3) ◽  
pp. 375-379 ◽  
Author(s):  
Luis H. Espinoza ◽  
Thomas M. Niemczyk ◽  
Brian R. Stallard
Keyword(s):  
Peak Height ◽  
Peak Width ◽  
Absorbance Spectrum ◽  
Background Spectrum ◽  
Filtering Method ◽  
Generation Technique ◽  
Sample Spectrum ◽  
Ft Ir ◽  
Gaseous Sample

The calculation of an absorbance spectrum depends on the measurement of a blank, or background spectrum. In many cases, such as the determination of atmospheric constituents with the use of open-path Fourier transform infrared spectroscopy (FT-IR) or the determination of water vapor in a gaseous sample, it is very difficult to obtain a good background spectrum. The difficulty is due to the fact that it is nearly impossible in these situations to measure a spectrum with no analyte features present. We present a method of generating a background spectrum based on filtering the analyte features from the sample spectrum. When the filtering method is used, the accuracy of the results obtained is found to be dependent upon the analyte peak width, peak height, and type of filter employed. Guidelines for the use of this background generation technique for quantitative determinations are presented.

Authentication of the Ancient Easel / Paintings Through Materials Identification from the Polychrome Layers II. Analysis by Means of the FT-IR Spectrophotometry

2008 ◽  
Vol 59 (4) ◽  
Author(s):  
Irina Crina Anca Sandu ◽  
Constantin Luca ◽  
Ion Sandu ◽  
Viorica Vasilache ◽  
Mikiko Hayashi
Keyword(s):  
Degradation Rate ◽  
Animal Glue ◽  
Painting Materials ◽  
Ageing Rate ◽  
Ir Spectrophotometry ◽  
Private And Public ◽  
Ft Ir

This is the second paper belonging to a study concerning the authentication of ancient easel-paintings, on canvas and wood support, from private and public collections, by using the FT-IR spectrophotometry technique for the analysis of the painting materials. Different pigments, egg binders, caseins and animal glue, often found in ancient easel-paintings on wood or canvas, have been used as standards for establishing the ageing rate of the paintings by correlation with the dates presented in the first note. The determination of the degradation rate of the painting materials is an important archaeometric characteristic used in authentication.

scholarly journals Revisiting cosmic microwave background radiation using blackbody radiation inversion

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Koustav Konar ◽  
Kingshuk Bose ◽  
R. K. Paul
Keyword(s):  
Temperature Distribution ◽  
Cosmic Microwave Background ◽  
Background Radiation ◽  
Big Bang ◽  
Blackbody Radiation ◽  
Microwave Background ◽  
Background Spectrum ◽  
Microwave Background Radiation ◽  
Mathematical Process

AbstractBlackbody radiation inversion is a mathematical process for the determination of probability distribution of temperature from measured radiated power spectrum. In this paper a simple and stable blackbody radiation inversion is achieved by using an analytical function with three determinable parameters for temperature distribution. This inversion technique is used to invert the blackbody radiation field of the cosmic microwave background, the remnant radiation of the hot big bang, to infer the temperature distribution of the generating medium. The salient features of this distribution are investigated and analysis of this distribution predicts the presence of distortion in the cosmic microwave background spectrum.

scholarly journals Influence of a Natural Plant Antioxidant on the Ageing Process of Ethylene-norbornene Copolymer (Topas)

2021 ◽  
Vol 22 (8) ◽  
pp. 4018
Author(s):  
Anna Masek ◽  
Angelika Plota
Keyword(s):  
Mechanical Properties ◽  
Food Packaging ◽  
Colour Change ◽  
Good Alternative ◽  
Plant Origin ◽  
Aging Behavior ◽  
Current State ◽  
Ft Ir ◽  
Potential Use

In the field of polymer technology, a variety of mainly synthetic additives are used to stabilize the materials during processing. However, natural compounds of plant origin can be a green alternative to chemicals such as synthetic polyphenols. An analysis of the effect of hesperidin on the aging behavior of ethylene-norbornene copolymer was performed. The evaluation of changes in the tested samples was possible by applying the following tests: determination of the surface energy and OIT values, mechanical properties analysis, colour change measurements, FT-IR and TGA analyses. The obtained results proved that hesperidin can be effectively used as natural stabilizer for polymers. Furthermore, as a result of this compound addition to Topas-silica composites, their surface and physico-mechanical properties have been improved and the resistance to aging significantly increased. Additionally, hesperidin can act as a dye or colour indicator and only few scientific reports describe a possibility of using flavonoids to detect changes in products during their service life, e.g., in food packaging. In the available literature, there is no information about the potential use of hesperidin as a stabilizer for cycloolefin copolymers. Therefore, this approach may contribute not only to the current state of knowledge, but also presents an eco-friendly solution that can be a good alternative to synthetic stabilizers.

Determination of ppb-Level CO, CO2, CH4, and H2O in High-Purity Gases Using Matrix Isolation FT-IR with an Integrating Sphere

1994 ◽  
Vol 66 (23) ◽  
pp. 4354-4358 ◽  
Author(s):  
Yoshimasa. Ogawara ◽  
Albert. Bruneau ◽  
Takako. Kimura
Keyword(s):  
High Purity ◽  
Matrix Isolation ◽  
Integrating Sphere ◽  
Ft Ir

Molecular Imprinted Graphene Oxide Nanocomposite for Optical Sensing of Nicotine in Human Blood Plasma

2020 ◽  
Vol 42 (6) ◽  
pp. 856-856
Author(s):  
Sehrish Qazi Sehrish Qazi ◽  
Huma Shaikh Huma Shaikh ◽  
Ayaz Ali Memon Ayaz Ali Memon ◽  
and Shahabuddin Memon and Shahabuddin Memon
Keyword(s):  
Graphene Oxide ◽  
Human Plasma ◽  
Human Blood ◽  
Optical Sensor ◽  
Single Layer ◽  
Human Blood Plasma ◽  
Buffer Concentration ◽  
Imprinted Polymer ◽  
Ft Ir

Among all psychotropic alkaloids, nicotine is more addictive, carcinogenic and capable of causing many health problems. This work is based on the development of highly robust, cheap, reliable, selective and sensitive nicotine imprinted graphene oxide nanocomposite (ImpGO nanocomposite) based optical sensor for determination of nicotine in human plasma. The ImpGO nanocomposite has been thoroughly characterized using different techniques i.e. FT-IR, SEM, TEM, Raman, etc. These characterizations revealed that ImpGO nanocomposite is comprised of single layer of graphene oxide successfully modified with imprinted polymer. The synthesized material was utilized to selectively determine nicotine using UV-vis spectrophotometer in BR buffer of 0.1 M at pH 3 and diluted human plasma. The effect of parameters such as buffer concentration, pH, amount of nanocomposite, etc on determination of nicotine using ImpGO nanocomposite were studied thoroughly. Thus, a sensitive optical method was developed for determination of nicotine in human plasma with linear range of 22-370 pM along with LOD and LOQ of 7 pM and 22 pM, respectively. The selectivity of sensor was evaluated using homologues of nicotine such as nicotine amide, caffeine and cotinine. The results obtained from biological samples showed that developed optical sensor is efficient in complex matrices of real sample.

Comparative chemotype determination of Lamiaceae plants by means of GC–MS, FT-IR, and dispersive-Raman spectroscopic techniques and GC-FID quantification

2014 ◽  
Vol 62 ◽  
pp. 22-33 ◽  
Author(s):  
Raquel Rodríguez-Solana ◽  
Dimitra J. Daferera ◽  
Christina Mitsi ◽  
Panayiotis Trigas ◽  
Moschos Polissiou ◽  
...  
Keyword(s):  
Spectroscopic Techniques ◽  
Raman Spectroscopic ◽  
Ft Ir
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