scholarly journals The Effect of the Coordination Ability on the Mg Plating/Stripping Behavior in Mg(N(CF3SO2)2)2/Glyme Based Electrolytes

2021 ◽  
Author(s):  
Fumihiro Sagane ◽  
Kenta Ogi ◽  
Akinori Konno ◽  
Kiyoshi Kanamura
Keyword(s):  
Crown Ether ◽  
Ir Spectra ◽  
Theoretical Calculation ◽  
The Other ◽  
Other Hand ◽  
Ft Ir ◽  
Coordination Ability

Abstract The effect of the coordination ability of the solvent species on the Mg plating/stripping behavior was investigated. The Mg plating reaction in Mg(N(CF3SO2)2)2/diglyme was inhibited by the equimolar of 15-crown-5 ether (15C5) to Mg2+-ion. On the other hand, Mg plating took place in the solution by reducing the amount of 15C5 less than that of Mg2+-ion. FT-IR spectra showed that 15C5 preferentially solvated Mg2+-ion in the glyme based solutions. The theoretical calculation indicated the interaction between Mg2+-ion and each O atom in 15C5 was stronger than that with diglyme or larger sized crown ether. The results showed that the coordination ability of the solvent species could be the critical for the Mg plating reaction.

FT-IR Spectroscopic Study of 1,5-Pentanedithiol and 1,6-Hexanedithiol Adsorbed on NaA, CaA and NaY Zeolites

2005 ◽  
Vol 60 (8-9) ◽  
pp. 633-636 ◽  
Author(s):  
Nuri Öztürk ◽  
Çağrı Çırak ◽  
Semiha Bahçeli
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectra ◽  
Spectroscopic Study ◽  
The Other ◽  
Other Hand ◽  
Liquid Phases ◽  
Stretching Vibration ◽  
Ft Ir ◽  
Ir Spectroscopic ◽  
Nay Zeolites

The adsorption of 1,5-pentanedithiol (1,5-PDT) and 1,6-hexanedithiol (1,6-HDT) in liquid phases on NaA (or 4A-type), CaA (or 5A-type) and NaY zeolites has been studied by using infrared spectroscopy. From the IR spectra it is found that the peak positions of the symmetric as well as the antisymmetric modes of the methylene (CH2) groups are observed at almost the same band values for the title dithiolates adsorbed on the A-type and NaY zeolites. On the other hand, the weak SH stretching vibration, observed for all samples, can be attributed to the sulphure atoms of 1,5-PDT and 1,6-HDT coordinatively adsorbed on cationic sites of the zeolites.

scholarly journals Effect of additional side groups on the vibrational frequencies of benzoquinone molecules

BIBECHANA ◽  
2016 ◽  
Vol 14 ◽  
pp. 66-76
Author(s):  
Nabin Kumar Raut ◽  
Hari Prasad Lamichhane
Keyword(s):  
Ir Spectra ◽  
Gas Phase ◽  
Vibrational Frequencies ◽  
The Other ◽  
Methyl Groups ◽  
Computational Investigation ◽  
Strongly Coupled ◽  
Solvent Phase ◽  
Other Hand

The present work enumerates detailed computational investigation into the IR spectra in gas phase and in solvent of 1, 4- Benzoquinone family (benzoquinone (BQ), duroquinone (DQ), plastoquinone (PQ), ubiquinone (UQ), and dimethoxy dimethyl benzoquinone (MQo)). In  the spectra of BQ, PQ, and DQ, we observed separate intense carbonyl (C=O) and C=C bands respectively around 1730 cm-1 (intense), 1645 cm-1 (weak). On the other hand, for UQ and MQo, three prominent bands around 1652, 1703, and 1733 cm-1 were observed, where two C=O modes were uncoupled but one of the carbonyl is strongly coupled with C=C vibrations. The additional methyl groups downshift the intense carbonyl bands and upshift C=C mode frequencies. The carbonyl modes further downshifted in the solvent phase calculation.BIBECHANA 14 (2017) 66-76

scholarly journals Synthesis of Ca-hydroxyapatite Bioceramic from Egg Shell and its Characterization

1970 ◽  
Vol 43 (4) ◽  
pp. 501-512 ◽  
Author(s):  
Samina Ahmed ◽  
Mainul Ahsan
Keyword(s):  
Crystalline Phase ◽  
Hexagonal Structure ◽  
The Other ◽  
Molar Ratio ◽  
Apatite Phase ◽  
Other Hand ◽  
Ft Ir ◽  
Egg Shell

Ca-hydroxyapatite (HA) was synthesised from egg shell under different conditions and characterised by using AAS, FT-IR, XRD, SEM and EDS techniques. The results of these analyses combined together indicate that sintered HA sample1 resembles the feature of pure and single apatite phase having hexagonal structure. A Ca/P molar ratio of 1.69 was achieved in this case. On the other hand HA obtained from calcined egg shell is a combination of both amorphous and crystalline phase and revealed a sub-stoichiometric Ca-deficient apatite form with a Ca/P ratio of 1.50. Keywords: Ca-hydroxyapatite, Biomaterials, Hexagonal, stoichiometric apatite, Ca-deficient apatite   doi: 10.3329/bjsir.v43i4.2240 Bangladesh J. Sci. Ind. Res. 43(4), 501-512, 2008

scholarly journals Profitability of biomass production in relation to harvesting technology

2020 ◽  
Vol 154 ◽  
pp. 01010
Author(s):  
Dariusz Kwaśniewski ◽  
Maciej Kuboń ◽  
Urszula Malaga-Toboła
Keyword(s):  
Theoretical Calculation ◽  
Surface Area ◽  
Biomass Production ◽  
Production Costs ◽  
The Other ◽  
Product Form ◽  
Computer Application ◽  
Other Hand

The aim of the paper was to determine the production costs and profitability of biomass production from Virginia mallow including various harvesting technologies. The paper covered theoretical calculation of the production costs of biomass form Virginia mallow with the use of the computer application “Biocalculator”. Calculations were made for a plantation with the surface area of 5 ha and four technologies of harvesting and the product form (pressed straw, chaff). The paper determines the profitability of production of biomass from Virginia mallow for four variants of sale prices of biomass at the level of 100, 120, 140 and 150 PLN∙t-1. In case of T1 technology all assumed prices of sale of Virginia mallow biomass with the obtained production costs were profitable. On the other hand, in T3 and T4 technology, the scope of sale prices from 120 to 150 PLN∙t-1 caused that the biomass production was profitable. While, the least profitable was application of T2 technology where only at the assessment of biomass sale 150 PLN∙t-1 production was profitable and in the remaining price options the profit was not obtained.

Direct deposition GC/IR techniques in natural product identification

2020 ◽  
Vol 37 (12) ◽  
pp. 1561-1567 ◽  
Author(s):  
Christian Schlawis ◽  
Stefan Schulz
Keyword(s):  
Ir Spectra ◽  
Theoretical Calculation ◽  
Natural Product ◽  
Volatile Compounds ◽  
Direct Deposition ◽  
Product Identification ◽  
Ft Ir

GC/DD-FT-IR is a powerful tool for the identification of volatile compounds especially in combination with theoretical calculation of IR-spectra.

Photo-Oxidation of an IR Vulcanizate

1981 ◽  
Vol 54 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Shoichiro Yano
Keyword(s):  
Ir Spectra ◽  
Rate Constant ◽  
Wavelength Dependence ◽  
The Other ◽  
Hydroxyl Groups ◽  
Carbonyl Groups ◽  
Absorption Bands ◽  
Photo Oxidation ◽  
Other Hand ◽  
Uv And Ir Spectra

Abstract On irradiation with uv light, changes in uv and ir spectra were observed. In the uv spectrum, a minimum at 290 nm due to sulfur, dibenzothiazyl disulfide, and double bonds in the main chains disappeared initially by the consumption of them; but the minimum reappeared on further irradiation reflecting the formation of carbonyl groups. On the other hand, in the ir spectrum two absorption bands appeared at 1720 cm−1 (due to carbonyl groups) and 3450 cm−1 (due to hydroxyl groups). The latter band faded out suggesting the decomposition of hydroperoxides when the vulcanizate was kept in the dark after irradiation. From the findings of the wavelength dependence of photo-oxidation on uv and ir spectra, it was found that the degradation occurred below about 430 nm. However, investigation of the wavelength dependence of photo-oxidation by the measurement of the crosslink density gave the results that crosslinking reactions occurred below about 340 nm, scissions of C-C and polysulfide crosslinks between 340 and about 400 nm, and scissions of polysulfide crosslinks between 400 and 600 nm. These were confirmed by measurements of the dynamic modulus during irradiation. The relative modulus E′(t)/E′(0) increased on irradiation with light at 253.7 nm in a longer time region reflecting a crosslinking reaction. On the other hand, on irradiation with light above 330 nm, E′(t)/E′(0) decreased with time. Change in E′(t)/E′(0) could be represented by the equation of the first order reaction containing an exponential term and the rate constant was determined. The activation energy was calculated as 18.6 kcal/mole from the temperature dependence of the rate constant and agreed with that for scission of polysulfide crosslinks. The photodegradation of the IR vulcanizate occurred also on irradiation with visible light (> 430 nm), and the modulus decreased.

Osteoconductive TiO2 Coating on Titanium Using Anodizing in High Content Phosphoric Acid

2012 ◽  
Vol 706-709 ◽  
pp. 538-542
Author(s):  
Kensuke Kuroda ◽  
Ryoichi Ichino ◽  
Masazumi Okido
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
The Other ◽  
High Crystallinity ◽  
Other Hand ◽  
Ft Ir ◽  
Low Crystallinity

In this study, anodizing of Ti in the various concentration of H3PO4 aqueous solutions gave TiO2 films, and the osteoconductivity was examined using in vivo testing. In the anodizing treatment, anodizing potential of < 200 V was applied to the Ti substrate in H3PO4 aqueous solutions with the concentration of 0.1 to 14 M at 298 K. The coatings were evaluated using SEM, XRD, FT-IR and XPS. In in vivo testing, the coated samples were implanted in the rats’ tibia for 14 d to evaluate the osteoconductivity. In H3PO4 aqueous solutions with any concentration, anatase-type TiO2 films were obtained on the Ti substrate by anodizing. The crystallinity of anodized TiO2 films depended on the concentration of H3PO4 and sparking. In less than 2 M H3PO4, anatase with high crystallinity was formed. On the other hand, anodizing with sparking in more than 4 M H3PO4, gave low crystallinity anatase film. In in vivo testing, osteoconductivity of the coatings with low crystallinity anatase was much higher than that with high crystallinity.

scholarly journals Reactivity of T-Nb2O5 or H-Nb2O5 towards V2O5. Synthesis in the solid state and properties of V4Nb18O55

2009 ◽  
Vol 7 (2) ◽  
pp. 222-227 ◽  
Author(s):  
Piotr Tabero ◽  
Elzbieta Filipek ◽  
Mateusz Piz
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Solid State ◽  
Ir Spectra ◽  
Ir Spectrum ◽  
The Other ◽  
Other Hand ◽  
Structural Relations

AbstractThe IR spectrum of V4Nb18O55 has been compared with the IR spectra of selected niobates of known structures to show structural relations between these compounds. This comparison shows that V4Nb18O55 has crystal structure related to T-Nb2O5, W16Nb18O94 and Ba2NaNb5O15. On the other hand, reaction between V2O5 and H-Nb2O5 yields a solid solution of V2O5 in VNb9O25. It has been proposed two models of synthesized solid solution with formulas V1+xNb9-xO25 or V1+xNb9O25+5x/2.Independently of Nb2O5 polymorph, used for synthesis, the metastable compound VNbO5 cannot be synthesized in the solid state below 650°C

FT-IR spectra of Li(AlxCo1-x)O2 (x=0.1-0.5)

2001 ◽  
Vol 699 ◽  
Author(s):  
W. Hao ◽  
C. Li ◽  
X. Meng ◽  
G. Chen ◽  
W. Xu
Keyword(s):  
Ir Spectra ◽  
The Other ◽  
Vibration Modes ◽  
Ft Ir ◽  
Two Peaks ◽  
Relative Change

AbstractFT-IR spectra from Li(AlxCo1-x)O2 (x=0.1-0.5) are reported. It was found out that there are four peaks located at 556cm−1, 601cm−1, 1438cm−1, 1498cm−1. First two peaks at 556cm−1 and 601cm−1 can be assigned to A2u and Eu vibration modes, respectively. The other two new peaks at 1438cm−1 and 1498cm−1 can not be explained clearly. With the increasing of Al concentration, all peaks position remain unchanged. However a relative change in the intensity of A2u and Eu peaks was observed.

Synthesis and Infrared Spectroscopic Investigation of Hydrogen-Bonded Complexes between 1,8-Bis(Dimethylamino)Naphthalene and 2,6-Dihydroxynaphthalene in 2:1 and 1:2 Ratios in the Crystalline forms and in Acetonitrile

2003 ◽  
Vol 2003 (7) ◽  
pp. 448-450 ◽  
Author(s):  
Moustafa M. Habeeb ◽  
Mohamed A. Kharaba
Keyword(s):  
Ir Spectra ◽  
Spectroscopic Investigation ◽  
The Other ◽  
Other Hand ◽  
Infrared Spectroscopic ◽  
Crystalline Forms ◽  
Bonded Complexes ◽  
Hydrogen Bonded

Two hydrogen bonded complexes between 1,8- bis(dimethylamino) naphthalene (DMAN) and 2,6-dihydroxynaphthalene (DHN) in 2:1 and 1:2 ratios were synthesised and studied using FTIR the spectra of the solid 2:1 complex revealed incomplete protonation of DMAN with the appearance of two broad absorptions representing ν(NHN)+ and ν(OHN) in the ranges 700–400 and 1600–700 cm−1 respectively, while the 1:2 complex indicated the complete protonation of DMAN with the appearance of two broad absorptions representing ν(NHN)+ and ν(OHO-) in the ranges 700–400 and 1600–700 cm−1 respectively. On the other hand the IR spectra in acetonitrile indicated that the 1:2 complex is more stable than the 2:1 complex.

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