Preparation of Tetragonal and Hexagonal Calcium Zincate

2011 ◽  
Vol 130-134 ◽  
pp. 1454-1457 ◽  
Author(s):  
Song Li ◽  
Yuan Yuan Zhou
Keyword(s):  
Infrared Spectroscopy ◽  
Crystal Size ◽  
Active Material ◽  
Transformation Method ◽  
Perfect Crystal ◽  
Crystal Shape ◽  
X Ray ◽  
Secondary Battery ◽  
Base Solution ◽  
First Time

Tetragonal and hexagonal calcium zincate as an active material in Zn/Ni secondary battery has been successfully prepared with precipitation transformation method by isothermal in the reasonable concentration of KOH as base solution for the first time. The chemical composition of Ca [Zn (OH)3]2•2H2O was confirmed by X-ray powder diffraction pattern 、TG-DSC and infrared spectroscopy. These results all show that perfect crystal shape of either regular tetragonal or hexagonal calcium zincate (regardless of crystal size) should always have the same chemical expression of Ca [Zn (OH)3]2•2H2O as its form; and incomplete crystal shape of calcium zincate prepared in different conditions , their chemical expression may be the form of Ca [Zn (OH)3]2•nH2O(n=1~2).

Preparation and Electrochemical Performances of Calcium Zincate Synthesized by Microwave Method

2011 ◽  
Vol 236-238 ◽  
pp. 868-871 ◽  
Author(s):  
Meng Liang Tong ◽  
Xuan Yan Liu
Keyword(s):  
Cyclic Voltammetry ◽  
Active Material ◽  
Electrochemical Performances ◽  
Microwave Method ◽  
X Ray ◽  
Battery Charge ◽  
Secondary Battery ◽  
Initial Capacity ◽  
Charge Discharge ◽  
Discharge Test

Calcium zincate as an active material in Zn/Ni secondary battery has been successfully synthesized by microwave method. The chemical composition of Ca(OH)2·2Zn(OH)2·2H2O was confirmed by X-ray powder diffraction pattern and weight loss in thermogravimetric analysis.The results of cyclic voltammetry and experimental Zn/Ni battery charge–discharge test showed that the material of calcium zincate had excellent electrochemical performances: a high discharging platform of 1.685 V and a good cycleability, discharge capacity would be 70.0% of initial capacity after circulated 120 times.

Reichenbachite from Cornwall and Portugal

1994 ◽  
Vol 58 (392) ◽  
pp. 449-454 ◽  
Author(s):  
R. S. W. Braithwaite ◽  
G. Ryback
Keyword(s):  
Infrared Spectroscopy ◽  
Rapid Method ◽  
World Wide ◽  
British Isles ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time

AbstractInfrared spectroscopy is a rapid method of distinguishing between pseudomalachite and its polymorphs reichenbachite and ludjibaite. This technique, backed by X-ray diffraction has shown that a number of specimens labelled ‘pseudomalachite’ from Cornwall, in particular from Old Gunnislake mine, are of reichenbachite, thus identified for the first time from the British Isles. Reichenbachite has also been identified with pseudomalachite from Miguel Vacas mine, Vila Viçosa, Evora, Portugal. Identification of pseudomalachite from a number of other localities world-wide has been confirmed, and some specimens have been shown to be arsenatian.

Dehydrogenation and Polymerization of TiOxHy Films in Obtaining Anatase Coating at Low Temperature

2002 ◽  
Vol 749 ◽  
Author(s):  
Kouichi Takayama ◽  
Shigeo Ohshio ◽  
Hidetoshi Saitoh
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Low Temperature ◽  
Vapor Deposition ◽  
Crystal Size ◽  
Chemical Vapor ◽  
Amorphous Films ◽  
X Ray ◽  
Titanium Tetra Isopropoxide

ABSTRACTChemical-vapor-deposition of titanium tetra-isopropoxide (TTIP) under the atmosphere at low temperature has been conducted. The structure of the obtained films was assessed using Fourier transform infrared spectroscopy, X-ray diffractometry and Raman spectroscopy. These analyses indicated that amorphous TiOxHy films were obtained at gas temperatures in the range of 150–300 °C, and crystalline anatase-TiO2 film was formed at 350 °C. This distinction is accounted for by plausible chemical reactions as follows; the hydroxyl reaction of TTIP below 350 °C promotes the formation of the amorphous TiOxHy. As the temperature goes up to 350 °C, dehydrogenation of the TiOxHy films promotes to form crystalline TiO2. Also the obtained amorphous films were annealed for 10 min under the atmosphere in assessing the transformation proceeding in the solid state. The structural change is shown at 350 °C, indicating that the crystalline phase would be formed via dehydrogenation and polymerization on the surface of the amorphous phase under the atmosphere. The crystal size of the annealed films was evaluated in assessment for the transformation.

Synthesis and Characterization of Zinc Doped Hydroxyapatite for Bone Substitute Applications

2014 ◽  
Vol 660 ◽  
pp. 942-946
Author(s):  
Mohamad Firdaus Abdul Wahid ◽  
C.M. Mardziah ◽  
Koay Mei Hyie ◽  
N.R. Nik Roselina
Keyword(s):  
Crystal Size ◽  
Diffraction Method ◽  
Lattice Parameters ◽  
Phase Changes ◽  
Precipitation Method ◽  
Zinc Ions ◽  
Crystal Shape ◽  
X Ray Diffraction ◽  
X Ray

Hydroxyapatite was prepared by using precipitation method. The substitution of zinc ions in hydroxyapatite structure was studied by several characterization techniques. Several concentration of zinc ions were substituted into hydroxyapatite. Characterization technique such as X-ray diffraction method was used to study the phase changes and the lattice parameters with the addition of zinc. Field emission scanning electron microscopy was used to examine the influence of zinc on the crystal size and the morphology of the as-synthesized powders. Based on X-ray diffraction result, the addition of zinc affects the lattice parameters and phase. The result showed that zinc ions were substituted in the structure. As zinc substitution increased, the lattice parameters a and c decreased. The crystal shape of hydroxyapatite without zinc ions was regular shapes while hydroxyapatite with zinc ions was irregular and also tends to agglomerates with single particle was calculated about 28 - 34 nm .

scholarly journals Compositional and Morphological Comparison among Three Coeval Violins Made by Giuseppe Guarneri “del Gesù” in 1734

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 884
Author(s):  
Giacomo Fiocco ◽  
Sebastian Gonzalez ◽  
Claudia Invernizzi ◽  
Tommaso Rovetta ◽  
Michela Albano ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Laser Scanner ◽  
Morphological Comparison ◽  
X Ray ◽  
Preliminary Information ◽  
Similarities And Differences ◽  
First Time ◽  
Ground Coat

In the present work, we had the opportunity to study the coating systems of three different coeval violins, namely “Spagnoletti”, “Stauffer”, and “Principe Doria”, made by Giuseppe Guarneri “del Gesù” in 1734. These three violins were non-invasively investigated by reflection Fourier transform infrared spectroscopy and X-ray fluorescence. These two techniques were combined for the first time with a 3D laser scanner. The analytical campaign enabled the characterization of the materials and their distribution within the stratigraphy, mainly composed of varnish and, when present, of a proteinaceous ground coat. Some restoration materials were also identified, suggesting the application of different maintenance treatments undertaken during their history. The preliminary information about morphological and geometrical differences between the three coeval violins were acquired through the 3D laser scanner in order to observe similarities and differences in the design features among the three violins.

Solvent-Induced Crystallization of Polyarylene Sulfide Sulfone

2015 ◽  
Vol 815 ◽  
pp. 529-533
Author(s):  
Su Ying Li ◽  
Yue Wu Gong ◽  
Sheng Ru Long ◽  
Xiao Jun Wang ◽  
Jie Yang
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Powder Diffraction ◽  
Induction Time ◽  
Crystallization Behavior ◽  
Crystal Size ◽  
Crystalline Region ◽  
X Ray ◽  
Induced Crystallization

In this paper, N-methyl-2-pyrrolidone (NMP) induced crystallization behavior of PASS was found and studied. To study NMP induced crystallization of PASS, Differential Scanning Calorimeter (DSC), X-Ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were employed. The results showed that the crystal induced by NMP was consistent with precipitates obtained in solution, and was the eutectic of PASS and NMP. With the induction time increased, crystalline region continued to improve and the crystal size became bigger.

scholarly journals A New Environmentally-Friendly System for Extracting Cellulose from Corn Straw: The Low Temperature Laccase System

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 437 ◽  
Author(s):  
Heming Song ◽  
Hongge Jia ◽  
Qingji Wang ◽  
Xinyi Zhao ◽  
Guoxing Yang ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Low Temperature ◽  
Agricultural Waste ◽  
Environmentally Friendly ◽  
Cellulose Content ◽  
X Ray Diffraction ◽  
Corn Straw ◽  
X Ray ◽  
First Time ◽  
New System

Corn straw is an agricultural waste. The system for extracting cellulose from corn straw at a high temperature has been widely reported by researchers. However, the system for extracting cellulose from corn straw at a low temperature has been rarely reported. In this paper, a new system for extracting cellulose from corn straw at a low temperature was reported for the first time. This new system is designated as the low temperature laccase system (LTLS). Cellulose was successfully extracted from corn straw by the LTLS, and the used solution could be recycled. Therefore, the low temperature laccase system is an environmentally-friendly system. The cellulose content in corn straw is 30–40%. The yield of cellulose extracted by LTLS was 33%. The obtained cellulose product was creamy white. The extracted cellulose samples were characterized by using infrared spectroscopy (IR), thermogravimetry (TG), and X-ray diffraction (XRD). The results were consistent with that of standard cellulose. We confirmed that the LTLS extracted cellulose from corn straw with high purity.

X-ray dynamical diffraction analogues of the integer and fractional Talbot effects

2019 ◽  
Vol 26 (5) ◽  
pp. 1650-1659 ◽  
Author(s):  
Minas K. Balyan
Keyword(s):  
Perfect Crystal ◽  
Talbot Effect ◽  
Dynamical Diffraction ◽  
X Ray ◽  
Dispersion Branch ◽  
Talbot Distance ◽  
Rational Multiple ◽  
Talbot Effects ◽  
First Time ◽  
Initial Distributions

The X-ray integer and fractional Talbot effect is studied under two-wave dynamical diffraction conditions in a perfect crystal, for the symmetrical Laue case of diffraction. The fractional dynamical diffraction Talbot effect is studied for the first time. A theory of the dynamical diffraction integer and fractional Talbot effect is given, introducing the dynamical diffraction comb function. An expression for the dynamical diffraction polarization-sensitive Talbot distance is established. At the rational multiple depths of the Talbot depth the wavefield amplitude for each dispersion branch is a coherent sum of the initial distributions, shifted by rational multiples of the object period and having its own phases. The simulated dynamical diffraction Talbot carpet for the Ronchi grating is presented.

An Unusual Chain Structure of Decavanadates V10O28 Linked by Zn(en)2 Units

2012 ◽  
Vol 67 (9) ◽  
pp. 855-859 ◽  
Author(s):  
Haijun Pang ◽  
Xin Meng ◽  
Huiyuan Ma ◽  
Bo Liu ◽  
Shaobin Li
Keyword(s):  
Infrared Spectroscopy ◽  
Transition Metal ◽  
Structural Feature ◽  
Transition Metal Complexes ◽  
Elemental Analysis ◽  
Chain Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
A Chain ◽  
First Time

A new decavanadate [Zn(en)2]3[V10O28] 5H2O (1), (en=ethylenediamine) has been hydrothermally synthesized and characterized by elemental analysis, infrared spectroscopy, thermogravimetry, and single-crystal X-ray diffraction. It is a structural feature of compound 1 that each [V10O28]6- cluster provides four bridging oxygen atoms of two pairs of opposite [VO6] octahedra to graft four [Zn(en)2]2+ complexes, observed for the first time for the [V10O28]6- cluster. The resulting array represents the second example of a chain based on these decavanadates linked by transition metal complexes

Effect of Manual Grinding on Diclofenac Acid Nanocrystals: A Chemico-Physical Investigation

2021 ◽  
Vol 21 (5) ◽  
pp. 2808-2815
Author(s):  
Alessandra Scano ◽  
Francesco Lai ◽  
Francesca Marongiu ◽  
Guido Ennas
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Powder Diffraction ◽  
Crystal Size ◽  
Molecular Conformation ◽  
Grinding Process ◽  
Physical Investigation ◽  
X Ray ◽  
Metastable Form

X-ray Powder Diffraction, Fourier Transform Infrared Spectroscopy and Differential Scanning Calorimeter were used to study the effect of the manual grinding in an agate mortar of the diclofenac acid polymorphs HD1 and HD2. In particular, we have tried to highlight how the HD2 form is more sensitive than the HD1 to the grinding process to achieve a nanometric crystal size. HD1 shows no change, while in the case of the HD2, changes in the molecular conformation and the formation of a new metastable form of the polymorph are observed after grinding.

Sign in / Sign up

Export Citation Format

Share Document