Dissecting the cohesiveness among aromatics, saturates and structural features of aromatics towards needle coke generation in DCU from clarified oil by analytical techniques

Fuel ◽  
2021 ◽  
Vol 304 ◽  
pp. 121459
Author(s):  
Sujit Mondal ◽  
Anil Yadav ◽  
Vibhav Pandey ◽  
Vatsala Sugumaran ◽  
Rashmi Bagai ◽  
...  
Keyword(s):  
Analytical Techniques ◽  
Structural Features ◽  
Needle Coke

scholarly journals Chitosan hydrogel/silk fibroin/Mg(OH)2 nanobiocomposite as a novel scaffold with antimicrobial activity and improved mechanical properties

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Reza Eivazzadeh-Keihan ◽  
Fateme Radinekiyan ◽  
Hooman Aghamirza Moghim Aliabadi ◽  
Sima Sukhtezari ◽  
Behnam Tahmasebi ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Cell Viability ◽  
Silk Fibroin ◽  
Analytical Techniques ◽  
Structural Features ◽  
Mechanical Tests ◽  
Chitosan Hydrogel ◽  
Biological Capacity ◽  
Ft Ir ◽  
Novel Scaffold

AbstractHerein, a novel nanobiocomposite scaffold based on modifying synthesized cross-linked terephthaloyl thiourea-chitosan hydrogel (CTT-CS hydrogel) substrate using the extracted silk fibroin (SF) biopolymer and prepared Mg(OH)2 nanoparticles was designed and synthesized. The biological capacity of this nanobiocomposite scaffold was evaluated by cell viability method, red blood cells hemolytic and anti-biofilm assays. According to the obtained results from 3 and 7 days, the cell viability of CTT-CS/SF/Mg(OH)2 nanobiocomposite scaffold was accompanied by a considerable increment from 62.5 to 89.6% respectively. Furthermore, its low hemolytic effect (4.5%), and as well, the high anti-biofilm activity and prevention of the P. aeruginosa biofilm formation confirmed its promising hemocompatibility and antibacterial activity. Apart from the cell viability, blood biocompatibility, and antibacterial activity of CTT-CS/SF/Mg(OH)2 nanobiocomposite scaffold, its structural features were characterized using spectral and analytical techniques (FT-IR, EDX, FE-SEM and TG). As well as, given the mechanical tests, it was indicated that the addition of SF and Mg(OH)2 nanoparticles to the CTT-CS hydrogel could improve its compressive strength from 65.42 to 649.56 kPa.

scholarly journals Singular Structural Features on Humic Fractions in Solution: Statistical Analysis of Diverse Analytical Techniques Spectra

2010 ◽  
Vol 74 (1) ◽  
pp. 74-86 ◽  
Author(s):  
Roberto Baigorri ◽  
Marta Fuentes ◽  
Francisco J. González-Vila ◽  
José M. García-Mina
Keyword(s):  
Statistical Analysis ◽  
Analytical Techniques ◽  
Structural Features ◽  
Humic Fractions

scholarly journals Plasma-Assisted Chemical Vapor Deposition of F-Doped MnO2 Nanostructures on Single Crystal Substrates

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1335
Author(s):  
Lorenzo Bigiani ◽  
Chiara Maccato ◽  
Alberto Gasparotto ◽  
Cinzia Sada ◽  
Elza Bontempi ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Data Storage ◽  
Vapor Deposition ◽  
Oxygen Deficiency ◽  
Chemical Vapor ◽  
Magnetic Ordering ◽  
Analytical Techniques ◽  
Structural Features ◽  
Optical Absorption Spectroscopy ◽  
Magnetic Characteristics

MnO2 nanostructures were fabricated by plasma assisted-chemical vapor deposition (PA-CVD) using a fluorinated diketonate diamine manganese complex, acting as single-source precursor for both Mn and F. The syntheses were performed from Ar/O2 plasmas on MgAl2O4(100), YAlO3(010), and Y3Al5O12(100) single crystals at a growth temperature of 300 °C, in order to investigate the substrate influence on material chemico-physical properties. A detailed characterization through complementary analytical techniques highlighted the formation of highly pure and oriented F-doped systems, comprising the sole β-MnO2 polymorph and exhibiting an inherent oxygen deficiency. Optical absorption spectroscopy revealed the presence of an appreciable Vis-light harvesting, of interest in view of possible photocatalytic applications in pollutant degradation and hydrogen production. The used substrates directly affected the system structural features, as well as the resulting magnetic characteristics. In particular, magnetic force microscopy (MFM) measurements, sensitive to the out-of-plane magnetization component, highlighted the formation of spin domains and long-range magnetic ordering in the developed materials, with features dependent on the system morphology. These results open the door to future engineering of the present nanostructures as possible magnetic media for integration in data storage devices.

Inorganic-Organic Hybrid Hierarchically Structured Methyl-modified Silica Monoliths

2004 ◽  
Vol 847 ◽  
Author(s):  
Doris Brandhuber ◽  
Nicola Hüsing ◽  
Herwig Peterlik
Keyword(s):  
Liquid Crystalline ◽  
Sol Gel ◽  
Analytical Techniques ◽  
Structural Features ◽  
Water Soluble ◽  
X Ray ◽  
Silica Monoliths ◽  
Organic Hybrid ◽  
X Ray Scattering ◽  
Highly Porous

ABSTRACTHighly porous inorganic-organic hybrid monoliths with mesopores in a macroporous network have been prepared from methyltris(2-hydroxyethoxy)silane (MeGMS) and tetrakis(2-hydroxyethoxy)silane (EGMS) in the presence of an amphiphilic block copolymer. The amount of methyltris(2-hydroxyethoxy)silane (MeGMS) in the gel has been varied from 0 to 100 %. These glycol-modified silanes have the advantage of being water-soluble and thus allowing for a direct templating of liquid-crystalline surfactant mesophases without the presence of a homogenizing organic solvent such as ethanol. The wet gels have been dried by supercritical extraction with carbon dioxide.In the present work, the sol-gel behaviour of these glycol-modified silanes is discussed especially with a focus on the formation of the meso- and macrostructure. In addition, the influences of the varying ratios of methyltris(2-hydroxyethoxy)silane on the structural features of the gels are investigated by various analytical techniques such as small angle X-ray scattering, nitrogen sorption, and scanning electron microscopy.

Recovery, Recording, and Publication

2019 ◽  
pp. 36-64
Author(s):  
D. W. Harding
Keyword(s):  
Radiocarbon Dating ◽  
Analytical Techniques ◽  
Structural Features ◽  
Environmental Archaeology ◽  
Late Development ◽  
World War ◽  
The First World War ◽  
Archaeological Reconstruction ◽  
Second World ◽  
First World

Was Pitt-Rivers really the ‘father of field archaeology’? He certainly contributed to artefact seriation and was aware of the importance of everyday artefacts for archaeological reconstruction, but, though meticulous in recording artefacts, he was not noted for recognizing structural features and he did not excavate stratigraphically. Field survey had a long history in Britain before the establishment of the Royal Commissions at the beginning of the twentieth century, with air photography subsequently developing out of military survey in the First World War. The importance of stratigraphy, association, and context was promoted by Sir Mortimer Wheeler from the 1930s, but scientific techniques were not widely applied until after the Second World War, with the advent of radiocarbon dating, geophysical survey, and a developing range of analytical techniques. Environmental archaeology as an integral part of the discipline was a relatively late development, as were osteological studies, notwithstanding the interest in craniology since Victorian times. ‘Rescue’ archaeology and development-funded archaeology has not only transformed the scale and quantity of finds, but has transformed qualitatively understanding of settlement patterns and distributions.

Comprehensive Investigation of Various Structural Features of Bituminous Coals Using Advanced Analytical Techniques

2015 ◽  
Vol 29 (11) ◽  
pp. 7178-7189 ◽  
Author(s):  
Kejiang Li ◽  
Rita Khanna ◽  
Jianliang Zhang ◽  
Mansoor Barati ◽  
Zhengjian Liu ◽  
...  
Keyword(s):  
Analytical Techniques ◽  
Structural Features ◽  
Comprehensive Investigation ◽  
Bituminous Coals

Study the structure and performance of thermal/plasma modified Au nanoparticle-doped TiO2 photocatalyst

2014 ◽  
Vol 28 (26) ◽  
pp. 1450208 ◽  
Author(s):  
Asif Mahmood ◽  
Shahid M. Ramay ◽  
Yousef S. Al-Zaghayer ◽  
Shahid Atiq ◽  
Iftikhar Ahmad ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Thermal Plasma ◽  
Ultra Violet ◽  
Textural Properties ◽  
Analytical Techniques ◽  
Structural Features ◽  
Au Nanoparticle ◽  
Pristine Sample ◽  
And Performance

This study describes the influence of thermal/plasma treatments on the structure and photocatalytic performance of the Au -doped TiO 2 catalyst. Au (gold) nanoparticles were attached on TiO 2 (Titania) nanoparticle surfaces by conventional deposition precipitation technique and the resulting catalysts were subsequently modified with thermal (at 450°C under vacuum) and plasma (at an ambient temperature under Argon atmosphere for 20 min) treatments. Structural characterization of the modified catalysts was performed by diverse analytical techniques and the photocatalytic activity was evaluated by assessing the degradation of the methylene blue (MB) in water under UV (ultra-violet) irradiations. Results showed that the thermal/plasma treatment significantly influenced the structural features of Au -doped TiO 2 catalyst by altering the morphology, increasing the Au nanoparticles population, improving the Au / TiO 2 catalytic activity, changing the textural properties and reducing the band gap energies thus tuned Au -doped TiO 2 catalyst to higher efficiency. Thermal/plasma treated Au -doped TiO 2 was found to exhibit higher photocatalytic activity than the as-synthesized (pristine sample). This improvement in photocatalytic activity might be due to the cathodic influence of gold in suppressing the electron–hole recombination during the reaction.

scholarly journals Synthesis and Characterization of Silver Nanoparticles Using Alginate from the Brown Seaweed Laminaria ochroleuca: Structural Features and Antibacterial Activity

2021 ◽  
Vol 12 (5) ◽  
pp. 6046-6057
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Sodium Alginate ◽  
Brown Seaweed ◽  
Analytical Techniques ◽  
Spherical Shape ◽  
Structural Features ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Laminaria Ochroleuca

In this study, inexpensive and eco-friendly production of the silver nanoparticles (AgNPs) was explored using Laminaria ochroleuca sodium alginate as stabilizing and reducing agent. The synthesized nanoparticles were characterized by various analytical techniques such as UV–Vis spectroscopy, Energy dispersive X-ray spectrometer (EDX), X-ray diffraction (XRD), transmission electron microscopy (TEM), TEM selected area electron diffraction (SAED), Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). The synthesis of AgNPs was elucidated by characteristic absorption peaks in the UV–Vis test. The FTIR analysis revealed the involvement of many functional groups in the bioreduction and the stabilization of AgNPs, while TEM images illustrated the spherical shape with maximum particles found in the size range of 10-20 nm. Prominent peaks and silver diffraction rings shown by the XRD spectrum and SAED pattern, respectively, confirmed the crystalline nature (fcc) of the synthesized AgNPs, which were found to be thermally stable based on TGA analysis. The AgNPs exhibited strong antibacterial activity against Gram+ and Gram– bacteria. The synthesized silver nanoparticles using Laminaria ochroleuca sodium alginate revealed interesting properties that could be potentially used for pharmaceutical applications.

scholarly journals Synthesis, spectral, crystallographic, and computational investigation of a novel molecular hybrid 3-(1-((benzoyloxy)imino)ethyl)-2H-chromen-2-ones

2021 ◽  
Vol 12 (2) ◽  
pp. 133-146
Author(s):  
Kannan Gokula Krishnan ◽  
Venugopal Thanikachalam
Keyword(s):  
Density Functional ◽  
Vibrational Energy ◽  
Chemical Shifts ◽  
Normal Modes ◽  
Analytical Techniques ◽  
Zero Point ◽  
Dft Method ◽  
Structural Features ◽  
Basis Set ◽  
Monoclinic Space Group

Synthesis of 3-(1-((benzoyloxy)imino)ethyl)-2H-chromen-2-ones (1-5) was accomplished and it was characterized experimentally using various analytical techniques. Computational studies have been carried out for all compounds 1-5 using B3LYP method with 6-311++G(d,p) basis set. The optimized structural features viz. bond lengths, bond angles, and dihedral angles are compared with their single-crystal X-ray diffraction results of compound 1 (Crystal data for C18H13NO4 (M = 307.29 g/mol): Monoclinic, space group P21/c (no. 14), a = 11.399(5) Å, b = 5.876(5) Å, c = 21.859(5) Å, β = 91.060(5)°, V = 1463.9(14) Å3, Z = 4, T = 293(2) K, μ(MoKα) = 0.100 mm-1, Dcalc = 1.394 g/cm3, 13555 reflections measured (3.58° ≤ 2Θ ≤ 56.98°), 3669 unique (Rint = 0.0235) which were used in all calculations. The final R1 was 0.0444 (>2sigma(I)) and wR2 was 0.1506 (all data)), which are in good conformity with each other. Normal modes of vibrational frequencies of compounds 1-5 acquired from density-functional theory (DFT) method coincided with the experimental ones. The 1H and 13C chemical shifts of compounds 1-5 have been calculated by GIAO method and the results have been compared with the experimental ones. The first-order hyperpolarizability and their related properties of the novel molecules 1-5 are calculated computationally. The other parameters like natural bond orbital, zero-point vibrational energy, EHOMO, ELUMO, heat capacity and entropy have also been discussed.

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