Corrigendum to “Impact of molar ratio of total metal ions to precipitant on YAG:Ce nanophosphors synthesized by reverse titration coprecipitation title of article” [Ceram. Int. (2017) 8730–8734]

2018 ◽  
Vol 44 (4) ◽  
pp. 4520
Author(s):  
Qi Qiu ◽  
Manjie Huang ◽  
Weimeng Zheng ◽  
Chaoyan Xuan ◽  
Yong Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Molar Ratio ◽  
Total Metal ◽  
Reverse Titration

Impact of molar ratio of total metal ions to precipitant on YAG:Ce nanophosphors synthesized by reverse titration coprecipitation

2017 ◽  
Vol 43 (12) ◽  
pp. 8730-8734 ◽  
Author(s):  
Qi Qiu ◽  
Manjie Huang ◽  
Weimeng Zheng ◽  
Chaoyan Xuan ◽  
Yong Wan ◽  
...  
Keyword(s):  
Metal Ions ◽  
Molar Ratio ◽  
Total Metal ◽  
Reverse Titration

Synthesis of Amorphous Al2O3-ZrO2 Powders Prepared by Citric Acid Gel Process

2012 ◽  
Vol 512-515 ◽  
pp. 73-76
Author(s):  
Yi Wang ◽  
Jia Chen Liu
Keyword(s):  
Particle Size ◽  
Citric Acid ◽  
Thermal Behavior ◽  
Metal Ions ◽  
Sem Analysis ◽  
Molar Ratio ◽  
Total Metal ◽  
Acid Gel

AmorphousAl2O3ZrO2powders were synthesized by citric acid gel process. The effects of molar ratio of citric acid to total metal ions concentration and the calcined powders with CA/M=2:1 were investigated through XRD and SEM analysis. Thermal behavior of the dried gel with CA/M=2:1 was studied by DSC/TG. Amorphous Al2O3-ZrO2 powders with particle size of about 3μm were obtained.

scholarly journals Synthesis, Characterization and Antimicrobial Activities of Mixed Ligand Complexes of Fe (II), Co(II), Ni(II) and Cu (II) Ions Derived from Imine of Benzidine and o-phenylenediammine

2020 ◽  
pp. 2762-2775 ◽  
Author(s):  
Hayder Hamied Mihsen ◽  
Suhad Kareem Abass ◽  
Maysaa Taqe Abed –Alhasan ◽  
Zainab M. Hassan ◽  
Ali Kreem Abass
Keyword(s):  
Metal Ions ◽  
Antimicrobial Activities ◽  
Fungal Species ◽  
Molar Ratio ◽  
Appreciable Change ◽  
Gram Positive Bacteria ◽  
Square Planar ◽  
Bacillus Spp ◽  
Ft Ir ◽  
Apparent Stability

Binuclear metal complexes of the metal ions Fe (II), Co (II), Ni (II) and Cu (II) were synthesized by the reaction of these metal ions with the imine of benzidine (H2L) as a primary ligand and o-phenylenediammine (OPD) as a secondary ligand  in a molar ratio of 2:2:1. The prepared complexes were characterized using CHN elemental analysis, FT-IR, UV-visible, molar conductivity, magnetic susceptibility and TGA-DTA thermogravimetric analysis. All the prepared complexes showed apparent stability and could be stored for months without any appreciable change. According to the results obtained by elemental and spectral analyses, a tetrahedral structure is suggested for all the prepared complexes, except for the copper complex which showed a square planar structure. The antimicrobial activities of these complexes were evaluated against Bacillus spp. (Gram-negative bacteria), Proteus spp. (Gram-positive bacteria) and Aspergillus niger (A. niger, a fungal species). The results showed that all the prepared complexes have no apparent effects on Bacillus spp. viability, whereas Proteus spp.  and A. niger were affected significantly.

Preparation and properties of uniform mixed colloidal particles; VI, copper(II)–yttrium(III), and copper(II)–lanthanum(III) compounds

1989 ◽  
Vol 4 (5) ◽  
pp. 1123-1131 ◽  
Author(s):  
François Ribot ◽  
Stanka Kratohvil ◽  
Egon Matijevié
Keyword(s):  
Reaction Time ◽  
Metal Ions ◽  
Colloidal Particles ◽  
Mixed Oxides ◽  
Molar Ratio

Uniform spherical colloidal particles of mixed internal composition were obtained by aging at 90 °C solutions containing Cu(NO3)2 + Y(NO3)3 and Cu(NO3)2 + La(NO3)3, respectively, in the presence of urea. The molar ratio of metal ions in the solids precipitated from a given solution varied with the reaction time. After sufficiently long aging, this ratio corresponded closely to that in solutions in which the particles were generated. The original precipitates consisted of basic carbonates, which on calcination converted to mixed oxides of defined composition.

Influence of Molar Ratio of Citric Acid to Metal Ions on Structure, Microstructure and Electrical Transport Properties on Nanosized La0.85Na0.15MnO3

2015 ◽  
Vol 1107 ◽  
pp. 261-266
Author(s):  
Kean Pah Lim ◽  
Kuen Hou Cheong ◽  
Abdul Halim Shaari ◽  
Mansor Hashim ◽  
Albert Han Ming Gan ◽  
...  
Keyword(s):  
Citric Acid ◽  
Metal Ions ◽  
Grain Boundaries ◽  
Transport Properties ◽  
Electrical Transport ◽  
Perovskite Phase ◽  
Hexagonal Structure ◽  
Molar Ratio ◽  
High Resistivity ◽  
Electrical Transport Properties

In this paper, nanosized La0.85Na0.15MnO3 (LNMO) has been synthesized via sol-gel method by involving two major steps, first the complexation of citric acid (CA) with metal ions (MI) and second the polyesterification between CA and ethylene glycol (EG). The effect of molar ratio CA:MI varying from 2-4 on structure, microstructure and electrical transport properties of LNMO have been investigated by constant the amount of EG. All samples show single perovskite phase with hexagonal structure and space group R3c after sintering at 800°C for 10h. Sample of molar ratio 2.5 is observed to possess smallest grain sizes which yield high resistivity value compared with others, is suggested to originate from the increase of tunneling barriers (grain boundaries). The large low field magnetoresistance (LFMR) of about ~ -16% at 0.1T and low temperature confirmed the important role of grain boundaries in the nanosized LNMO.

scholarly journals Characterization and Quantification of Luteolin-Metal Complexes in Aqueous Extract of Lonicerae Japonicae Flos and Huangshan Wild Chrysanthemum

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Weilan Cai ◽  
Yunhao Xiong ◽  
Manman Han ◽  
Zhimin Li ◽  
Liang Peng ◽  
...  
Keyword(s):  
Free Radicals ◽  
Medicinal Plants ◽  
Metal Ions ◽  
High Performance ◽  
Hot Water ◽  
Molar Ratio ◽  
Flavonoid Compound ◽  
Peak Areas ◽  
Dpph Scavenging ◽  
Dose Dependent

Luteolin is a flavonoid compound widely found in vegetables, fruits, and medicinal plants. In this study, the reaction conditions for luteolin and five metal ions (Ca2+, Mg2+, Zn2+, Fe3+, and Cu2+) to form complexes in hot water were optimized, which was at a molar ratio of 1 : 1 for luteolin and metal ions at 90°C in a volume of 20 mL for 2 h, and the ability of luteolin to form complexes with Cu2+ was the strongest. The DPPH scavenging test showed that luteolin exerted a dose-dependent effect on the clearance of free radicals; luteolin-Cu2+ complexes and luteolin-Fe3+ complexes accentuated the clearance of free radicals. Furthermore, we used high performance liquid chromatography (HPLC) to analyze luteolin in samples from two medicinal plants, obtained from the dissolution of aqueous extracts in two different solvents. The results showed that the peak areas for luteolin in the samples dissolved in 20% formic acid-methanol were significantly larger than those from the samples dissolved in methanol alone, with increases in the peak area being 135.6% (Lonicerae Japonicae Flos), and 161.16% (Huangshan wild chrysanthemum). The aforementioned results indicate that complexes formed from organic compounds and metal ions are present in the decoction of a plant.

scholarly journals Efficient Recovery of Noble Metal Ions (Pd2+, Ag+, Pt2+, and Au3+) from Aqueous Solutions Using N,N'-Bis(salicylidene)ethylenediamine (Salen) as an Extractant (Classic Solvent Extraction) and Carrier (Polymer Membranes)

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 863
Author(s):  
Katarzyna Witt ◽  
Małgorzata A. Kaczorowska ◽  
Daria Bożejewicz ◽  
Włodzimierz Urbaniak
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Noble Metal ◽  
High Resolution Mass Spectrometry ◽  
Polymer Membranes ◽  
Single Component ◽  
Molar Ratio ◽  
Efficient Recovery ◽  
The Stability ◽  
Precious Metal Ions

This paper presents the results of the first application of N,N'-bis(salicylidene)ethylenediamine (salen) as an extractant in classical liquid–liquid extraction and as a carrier in membrane processes designed for the recovery of noble metal ions (Pd2+, Ag+, Pt2+, and Au3+) from aqueous solutions. In the case of the utilization of membranes, both sorption and desorption were investigated. Salen has not been used so far in the sorption processes of precious metal ions. Recovery experiments were performed on single-component solutions (containing only one type of metal ions) and polymetallic solutions (containing ions of all four metals). The stability constants of the obtained complexes were determined spectrophotometrically. In contrast, electrospray ionization high-resolution mass spectrometry (ESI-HRMS) was applied to examine the elemental composition and charge of the generated complexes of chosen noble metal ions and salen molecules. The results show the great potential of N,N'-bis(salicylidene)ethylenediamine as both an extractant and a carrier. In the case of single-component solutions, the extraction percentage was over 99% for all noble metal ions (molar ratio M:L of 1:1), and in the case of a polymetallic solution, it was the lowest, but over 94% for platinum ions and the highest value (over 99%) for gold ions. The percentages of sorption (%Rs) of metal ions from single-component solutions using polymer membranes containing N,N'-bis(salicylidene)ethylenediamine as a carrier were highest after 24 h of the process (93.23% for silver(I) ions, 74.99% for gold(III) ions, 69.11% and 66.13% for palladium(II) and platinum(II) ions, respectively), similar to the values obtained for the membrane process conducted in multi-metal solutions (92.96%, 84.26%, 80.94%, and 48.36% for Pd(II), Au(III), Ag(I), and Pt(II) ions, respectively). The percentage of desorption (%Rdes) was very high for single-component solutions (the highest, i.e., 99%, for palladium solution and the lowest, i.e., 88%, for silver solution), while for polymetallic solutions, these values were slightly lower (for Pt(II), it was the lowest at 63.25%).

scholarly journals Voltammetric study of the interactions of alkaline earth metal ions and melamine at different ph

2016 ◽  
Vol 27 (1) ◽  
pp. 39-50
Author(s):  
Farhana Haque ◽  
Afroza Khatun ◽  
PK Bakshi ◽  
AA Shaikh
Keyword(s):  
Metal Ions ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Suitable Condition ◽  
Acetate Buffer ◽  
Acetate Buffer Solution ◽  
Molar Ratio ◽  
Alkaline Earth Metal ◽  
Buffer Solution ◽  
Alkaline Earth Metal Ions

The electrochemical redox behavior of alkaline earth metal ions at different pH in acetate buffer solution has been investigated using cyclic voltammetric method at gold disk electrode (GDE). In the entire studied pH (3.68-6.23), metal ions show two cathodic and an anodic peak. The method has also been employed to observe the interaction of metal ions with melamine in acetate buffer solution. At all pH, a reasonably strong interaction occurs between metal ions and melamine at different metal ions/melamine molar ratio. However, maximum interaction takes place at 1:4 molar ratios of metal ions and melamine at pH 6.23. This is possibly the most suitable condition for alkaline earth metal-melamine interaction.Bangladesh J. Sci. Res. 27(1): 39-50, June-2014

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