scholarly journals Application of FT-IR technique to bituminous materials

2014 ◽  
Vol 13 (4) ◽  
pp. 317-324
Author(s):  
Adam Zofka ◽  
Dominika Maliszewska ◽  
Maciej Maliszewski
Keyword(s):  
Molecular Structure ◽  
Quality Assurance ◽  
Ir Spectra ◽  
Material Science ◽  
Functional Group ◽  
Construction Materials ◽  
Practical Applications ◽  
Bituminous Materials ◽  
Ft Ir ◽  
Detection And Quantification

Spectroscopy is a fundamental method used in the material science that relies on the interaction of the electromagnetic radiation with a matter. Infrared spectroscopy allows for material fingerprinting as well as detection and quantification of compounds in a sample. In principle, IR spectrometers record the absorption of electromagnetic energy by chemical bounds in a sample as a function of wavelength. Chemical bounds have unique spectra bands at specific wavelengths regardless of the composition of the remaining molecular structure. The absorbance at these specific wavelengths can be used to quantify a particular functional group in the analyzed material. Absorbance peaks are easily identified on the IR spectra and can be used to fingerprint a compound in a mixture, especially when compared to the original unmodified IR spectra. In the recent years, the FT-IR method has become a popular tool for the quality assurance in the practical applications as well as it became a very useful tool in studying various construction materials, e.g. portland cement, bitumen, etc.

Experimental Study on DNA Molecular Structure of Acute Myeloid Leukemia and Myelodysplastic Syndrome by FT-IR Spectra.

Blood ◽  
2006 ◽  
Vol 108 (11) ◽  
pp. 4409-4409
Author(s):  
Shihong Wang ◽  
Zhijian Xiao ◽  
Ming-Zhe Han ◽  
Qiang Wu
Keyword(s):  
Molecular Structure ◽  
Acute Myeloid Leukemia ◽  
Ir Spectra ◽  
Myeloid Leukemia ◽  
Control Groups ◽  
Diagnosis And Prognosis ◽  
Significant Difference ◽  
Ft Ir ◽  
And Control ◽  
Acute Myeloid

Abstract So for, there were no definite molecular markers in most acute myeloid leukemia(AML) and myelodysplastic syndrome(MDS), and their molecular mechanisms have not been clarified. Their clinical diagnosis were mainly based on morphology of bone marrow and peripheral blood cells. The current study aimed to explore the mechanisms of abnormal DNA molecular structure in AML and MDS by Fourier Transform Infrared(FT-IR) spectra, and to explore the methods of early diagnosis and prognosis. At first, we segregated the mononuclear cells of AML-M2a, MDS and control groups samples, extracted the DNA of these cells, then we checked the completely dry DNA by FT-IR spectra and analysed the identity and difference among AML-M2a, MDS and Control groups. Comparing the mean DNA spectra of the AML-M2a, MDS and control groups revealed statistically significant difference(p<0.001). Each group has an almost concordant FT-IR spectra rule. Compared with the control group, AML-M2a and MDS both were significant different(p<0.001). Absorbance increasing of DNA in AML-M2a, MDS at the wavenumber 2880cm-1 and 2940cm-1 shown hypermethylation of nucleotide base(p<0.001). Absorbance decreasing at wavenumber 1420cm-1 demonstrated deacetylation(p<0.001). Absorbance decreasing at wavenumber 1150cm-1 indicated the abnormality of C—O,S=O,C—OH,C—C,C—O—C,C—N, and the absorbance increasing at wavenumber 1660–1590cm-1 reflected in-plane ring, C=N stretching vibrations and hypermethylation of cytosine. There were also other mild difference among AML-M2a, MDS and control groups. In summary, The principal chain, phosphonic backbone and nucleotide base of DNA in AML-M2a and MDS have significant difference with the control and could be the initial changes of DNA in AML and MDS occurrence and development. Based on the rules of change, FT-IR spectra is a potential method of early diagnosis and prognosis in AML and MDS.

scholarly journals Molecular structure of calcium, magnesium, strontium and barium m-nitrobenzoates

2010 ◽  
Vol 24 (3-4) ◽  
pp. 433-437 ◽  
Author(s):  
Mariola Samsonowicz
Keyword(s):  
Molecular Structure ◽  
Electronic Structure ◽  
Ir Spectra ◽  
Dipole Moments ◽  
Atomic Charges ◽  
Barium Ions ◽  
Nitrobenzoic Acid ◽  
Calcium Magnesium ◽  
Ft Ir

The effect of calcium, magnesium, strontium and barium ions on the electronic structure of m-nitrobenzoates was studied. The FT-IR spectra of m-nitrobenzoic acid and its salts were registered, assigned and analyzed. Characteristic shifts and changes in intensities of bands along the metal series were observed. The structures of m-nitrobenzoic acid and its calcium, magnesium, strontium and barium salts were optimized at the B3LYP/LANL2DZ level. Geometric aromaticity indices, atomic charges, dipole moments and energies were also calculated.

Detection and quantification of food colorant adulteration in saffron sample using chemometric analysis of FT-IR spectra

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 23085-23093 ◽  
Author(s):  
Sadegh Karimi ◽  
Javad Feizy ◽  
Fatemeh Mehrjo ◽  
Maryam Farrokhnia
Keyword(s):  
Pattern Recognition ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ir Spectra ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Chemometric Analysis ◽  
Food Colorants ◽  
Ft Ir ◽  
Detection And Quantification

The aim of present study is to investigate the combination of Fourier transform infrared spectroscopy with pattern recognition to recognize the standard saffron from those which have been adulterated with various types of food colorants.

scholarly journals Synthesis, molecular structure, spectroscopic and computational studies on 4-(2-(2-(2-formylphenoxy)ethoxy)ethoxy)phthalonitrile as Functionalized Phthalonitrile

2019 ◽  
Vol 38 (1) ◽  
pp. 63 ◽  
Author(s):  
Pinar Sen ◽  
Salih Zeki Yıldız ◽  
Vildan Enisoglu Atalay ◽  
Sibel Demir Kanmazalp ◽  
Necmi Dege
Keyword(s):  
Molecular Structure ◽  
Functional Group ◽  
Spectroscopic Properties ◽  
Comparative Approach ◽  
Computational Studies ◽  
Crystal Data ◽  
X Ray ◽  
Elemental Analyses ◽  
Ft Ir

This work presents the synthesis and characterization of a novel compound, 4-(2-(2-(2-formylphenoxy)ethoxy)ethoxy)phthalonitrile as the aldehyde functional group substituted phthalonitrile derivative. The spectroscopic properties of the compound were examined by FT-IR, 1H-NMR, 13C-NMR, UV-vis, MS, elemental analyses. The molecular structure of the compound was also confirmed using X-ray single-crystal data with a theorical comparative approach.

Facile Synthesis of Pyrene/Pyrrole Copolymer with Strong Green Fluorescence

2012 ◽  
Vol 482-484 ◽  
pp. 835-838
Author(s):  
Zhen Zhong Hou ◽  
Qing Hao Yang ◽  
Ying Li
Keyword(s):  
Molecular Structure ◽  
Ir Spectra ◽  
Stokes Shift ◽  
Linear Structure ◽  
Green Fluorescence ◽  
Facile Synthesis ◽  
Copolymer Solution ◽  
Ft Ir ◽  
Fluorescence Spectrometer ◽  
Oxidative Copolymerization

The pyrene/pyrrole copolymer (Pn/Py copolymer) has been sucessfully synthesized by the facile chemically oxidative copolymerization. UV-vis and FT-IR spectra are used to investigate the molecular structure of the copolymer. The results show that pyrene and pyrrole units in the copolymer chain are interconnected via α, α-coupling to form a linear structure. At the same concentration, the copolymer solution exhibits the strongest green fluorescence with a maximum emission at 503 nm and a large stokes shift of about 113 nm by fluorescence spectrometer. The excellent fluorescence of Pn/Py copolymer may be due to its better planar molecular structure and higher large π-conjugation, that is confirmed by UV-vis spectra and molecular simulation.

scholarly journals Application of Addawa’ul Humma Preparation for the Treatment of Typhoid Fever

2021 ◽  
Vol 3 (1) ◽  
pp. 01-08
Author(s):  
Ummu Rabiu R A ◽  
Ahmad Umar faruk ◽  
Iliyasu Mahmud Yerima ◽  
Haruna Saidu ◽  
Yahaya Rabiu R A ◽  
...  
Keyword(s):  
Typhoid Fever ◽  
Ir Spectra ◽  
Carbonyl Group ◽  
Functional Group ◽  
Control Experiment ◽  
Physicochemical Analysis ◽  
Herbal Preparation ◽  
Phytochemical Screening ◽  
Standard Drug ◽  
Ft Ir

The study assessed the efficacy of Addawa’ul humma for the treatment of typhoid fever. Addawau’l humma is a name given to a herbal preparation consisting of (Mango, Neem, Orange, Lemons, and Guava extract). The preparation was tested and compare with the standard drug Ciprofloxacin as control experiment. Results of phytochemical screening showed the presence of Alkaloid, Flavonoid, Tannins, Glycosides, Anthraquinone, Saponins and Steroid. There is no significance difference between Addawa’ul humma and the standard drug Ciproflxacin (P<0.05). However, the physicochemical analysis result of Addawa’ul humma shows that it has the highest concentration of phosphate and sulphate (0.72 mg/kg and 0.2 mg/kg respectively). Results of the FT-IR indicated that the preparation consists of unsaturated with Alkanol functional group plus additional carbonyl group as shown by the FT-IR Spectra.

Light- or Dark-Colored, L-DOPA-Based Melanins

2018 ◽  
Author(s):  
Koen Vercruysse ◽  
Margaret M. Whalen
Keyword(s):  
Human Physiology ◽  
Ir Spectra ◽  
Immune Cells ◽  
Chemical Properties ◽  
Chemical Signature ◽  
Ft Ir

<p>This report is a continuation of previous research on the H<sub>2</sub>O<sub>2</sub>-mediated synthesis of melanin-like pigments. We synthesized and characterized L-DOPA-based pigments using air- or H<sub>2</sub>O<sub>2</sub>-mediated<sub> </sub>oxidation. We compared their physic-chemical properties and evaluated their capacity to affect the interleukin release from immune cells. The use of higher concentrations of H<sub>2</sub>O<sub>2</sub> resulted in melanin-like materials with a distinct chemical signature in their FT-IR spectra and a lighter color. All pigments enhanced the interleukin release from immune cells. The possibility that lighter-colored melanins can be generated is discussed in the context of the importance of melanin-based pigmentation in human physiology.</p>

scholarly journals Review on the Use of Artificial Intelligence to Predict Fire Performance of Construction Materials and Their Flame Retardancy

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1022
Author(s):  
Hoang T. Nguyen ◽  
Kate T. Q. Nguyen ◽  
Tu C. Le ◽  
Guomin Zhang
Keyword(s):  
Artificial Intelligence ◽  
Flame Retardancy ◽  
Material Science ◽  
Construction Materials ◽  
Engineering Problem ◽  
Future Research ◽  
Fire Performance ◽  
Structural Components ◽  
Comprehensive Overview ◽  
Fire Engineering

The evaluation and interpretation of the behavior of construction materials under fire conditions have been complicated. Over the last few years, artificial intelligence (AI) has emerged as a reliable method to tackle this engineering problem. This review summarizes existing studies that applied AI to predict the fire performance of different construction materials (e.g., concrete, steel, timber, and composites). The prediction of the flame retardancy of some structural components such as beams, columns, slabs, and connections by utilizing AI-based models is also discussed. The end of this review offers insights on the advantages, existing challenges, and recommendations for the development of AI techniques used to evaluate the fire performance of construction materials and their flame retardancy. This review offers a comprehensive overview to researchers in the fields of fire engineering and material science, and it encourages them to explore and consider the use of AI in future research projects.

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