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Journal articles on the topic 'Aqueous complexing agents'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Shapoval, Pavlo, Martyn Sozanskyi, Iosyp Yatchyshyn, Bogdan Kulyk, Mykhaylo Shpotyuk, and Roman Gladyshevskii. "The Effect of Different Complexing Agents on the Properties of Zinc Sulfide Thin Films Deposited from Aqueous Solutions." Chemistry & Chemical Technology 10, no. 3 (2016): 317–23. http://dx.doi.org/10.23939/chcht10.03.317.

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The zinc sulfide (ZnS) thin films were prepared on glass substrates by chemical bath deposition using the aqueous solutions of zinc chloride, thiourea, pH regulator and complexing agent (ammonia and hydrazine hydrate, trisodium citrate or sodium hydroxide). The calculations of boundary conditions for formation of zinc sulfide and zinc hydroxide were made at various zinc salt concentrations with different complexing agents. The structural, morphology and optical properties of the ZnS thin films were investigated. The thickness of ZnS films was measured and the recalculation of zinc mass per cm2

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2

PIERSON, BRUCE, STAN VAN WAGENEN, KENNETH W. NEBESNY, QUINTUS FERNANDO, NELSON SCOTT, and DEAN E. CARTER. "Dissolution of Crystalline Gallium Arsenide in Aqueous Solutions Containing Complexing Agents." American Industrial Hygiene Association Journal 50, no. 9 (1989): 455–59. http://dx.doi.org/10.1080/15298668991374985.

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3

Sozanskyi, M. A., P. Yo Shapoval, V. E. Stadnik, R. R. Guminilovych, and O. P. Kurylo. "Quantum-chemical modeling of the processes of cadmium sulfide and cadmium selenide films synthesis in aqueous solutions." Chemistry, Technology and Application of Substances 4, no. 1 (2021): 26–32. http://dx.doi.org/10.23939/ctas2021.01.026.

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The quantum-chemical modeling of the synthesis process chemistry of CdS and CdSe in aqueos solutions was carried out. For that reason, the CdS synthesis simulation was carried out through the formation of Cd(II) complex forms with the trisodium citrate and ammonium hydroxide. At the CdSe synthesis, the sodium selenosulfate with and without trisodium citrate was used. It was established that this process passes through several intermediate stages with the transitional reactive complexes formation. On the basis of obtained data, the energy stages diagrams are constructed and the comparison of Cd

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4

Mendoza, Carolina, Susanna Jansat, Ramón Vilar, and Miquel A. Pericàs. "Clickable complexing agents: functional crown ethers for immobilisation onto polymers and magnetic nanoparticles." RSC Advances 5, no. 106 (2015): 87352–63. http://dx.doi.org/10.1039/c5ra10027e.

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A modular library of crown ethers and monoazacrown ethers supported by CuAAC reactions onto magnetic nanoparticles and polymers has been prepared and evaluated as extracting materials for Pb<sup>2+</sup> from aqueous and organic solutions.

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5

Macášek, F., P. Bartoš, and P. Gerhart. "Partition of lead in a milk-pectin aqueous biphasic system with complexing agents." Journal of Radioanalytical and Nuclear Chemistry 229, no. 1-2 (1998): 87–89. http://dx.doi.org/10.1007/bf02389452.

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6

Boulebd, Houssem, Yousra Doria Lahneche, Imene Amine Khodja, Meriem Benslimane, and Ali Belfaitah. "New Schiff bases derived from benzimidazole as efficient mercury-complexing agents in aqueous medium." Journal of Molecular Structure 1196 (November 2019): 58–65. http://dx.doi.org/10.1016/j.molstruc.2019.06.060.

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7

YASUE, Tamotsu, Satoshi OZAWA, and Yasuo ARAI. "Measurement of sequestration capacity of complexing agents for calcium and magnesium in aqueous solution." NIPPON KAGAKU KAISHI, no. 6 (1986): 767–70. http://dx.doi.org/10.1246/nikkashi.1986.767.

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8

Franger, S., P. Berthet, and J. Berthon. "Electrochemical synthesis of Fe 3 O 4 nanoparticles in alkaline aqueous solutions containing complexing agents." Journal of Solid State Electrochemistry 8, no. 4 (2004): 218–23. http://dx.doi.org/10.1007/s10008-003-0469-6.

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9

Kiegiel, Katarzyna, Lukasz Steczek, and Grazyna Zakrzewska-Trznadel. "Application of Calixarenes as Macrocyclic Ligands for Uranium(VI): A Review." Journal of Chemistry 2013 (2013): 1–16. http://dx.doi.org/10.1155/2013/762819.

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Calixarenes represent a well-known family of macrocyclic molecules with broad range of potential applications in chemical, analytical, and engineering materials fields. This paper covers the use of calixarenes as complexing agents for uranium(VI). The high effectiveness of calix[6]arenes in comparison to other calixarenes in uranium(VI) separation process is also presented. Processes such as liquid-liquid extraction (LLE), liquid membrane (LM) separation, and ion exchange are considered as potential fields for application of calixarenes as useful agents for bindingUO22+for effective separation

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10

Protsenko, V. S., V. O. Gordiienko, F. I. Danilov, and S. C. Kwon. "Preparation and Characterization of Nanocrystalline Hard Chromium Coatings Using Eco-Friendly Trivalent Chromium Bath." E-Journal of Chemistry 8, no. 4 (2011): 1925–29. http://dx.doi.org/10.1155/2011/253203.

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A new aqueous sulfate trivalent chromium bath is described. The chromium bath contains formic acid and carbamide as complexing agents. Chromium was deposited at a temperature of 30÷40oC and a cathode current density of 10÷25 A dm-2. The bath allows obtaining thick (up to several hundred micrometers) hard chromium coatings with nanocrystalline structure. The electrodeposition rate reaches 0.8÷0.9 µm min-1.

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11

Cox, B. G., E. Buncel, H. S. Shin, R. A. B. Bannard, and J. G. Purdon. "Extraction of alkaline-earth metal ortho- and para-nitrophenoxides from aqueous media by crown ether and cryptand complexing agents." Canadian Journal of Chemistry 64, no. 5 (1986): 920–25. http://dx.doi.org/10.1139/v86-152.

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A study has been performed on the extraction of alkaline-earth metal ortho- and para-nitrophenoxides, from aqueous medium into methylene chloride, in the presence of crown ether and cryptand complexing agents. The results are analyzed in terms of the various constituent complexation and extraction equilibria involved. Comparison is drawn with our previously reported study on extraction of potassium p-nitrophenoxide. The different anion stoichiometries in the two systems result in relatively more favorable extraction of M+ systems at low anion concentrations. Furthermore, while extraction of MX

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12

GENG, JUN, JIAN-RONG ZHANG, JIAN-MIN HONG, and JUN-JIE ZHU. "SONOCHEMICAL SYNTHESIS OF PbWO4 NANOPARTICLES." International Journal of Modern Physics B 19, no. 15n17 (2005): 2734–39. http://dx.doi.org/10.1142/s0217979205031614.

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Lead tungstate ( PbWO 4) an important inorganic scintillator, was synthesized via a mild sonochemical route from an aqueous solution of lead acetate and sodium tungstate in the presence of complexing agents under ambient air. X-ray diffraction (XRD), transmission electron microscope (TEM) and photoluminescence (PL) were used to characterize the products. The as-prepared PbWO 4 nanocrystals crystallize in a tetragonal structure and have an average crystal size of ca. 10 nm.

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13

Trivunac, Katarina, and Slavica Stevanovic. "Effects of operating parameters on efficiency of lead removal by complexation-microfiltration process." Chemical Industry 66, no. 4 (2012): 461–67. http://dx.doi.org/10.2298/hemind111122007t.

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Majority of lead content found in the environment is the result of human activities. Heavy metals can be hazardous because they tend to bioaccumulate. Complexation-microfiltration process for the removal of Pb(II) ions was studied. The aim of microfiltration of the model wastewater containing heavy metal ions was finding an optimum ratio between the concentrations of the complexing agent and metal, and determining the most favorable pH value. The microfiltration experiments were carried out in a stirred dead-end cell. Diethylaminoethyl cellulose (DEAE 23) was selected as the complexing agent.

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14

Juang, Ruey-Shin, and Yi-Chieh Wang. "Use of complexing agents for effective ion-exchange separation of Co(II)/Ni(II) from aqueous solutions." Water Research 37, no. 4 (2003): 845–52. http://dx.doi.org/10.1016/s0043-1354(02)00423-2.

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15

Williams, Peter A. "Solutions in the “big laboratory”: Toward a model for metals at the Earth’s surface." Pure and Applied Chemistry 77, no. 3 (2005): 643–51. http://dx.doi.org/10.1351/pac200577030643.

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Numerous factors control the chemistry of metal ions in natural aqueous systems. These include the presence of a host of complexing agents, speciation among a variety of competing ligands, buffering due to precipitated solid phases, and the relative influences of kinetic versus thermodynamic phenomena. Natural aqueous systems are inevitably complicated, but simple, inorganic models can be constructed to characterize a variety of different environments. While available data sets for these models are large, it is clear that much further research is required in order to develop more sophisticated

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16

Liu, Wei, Xian Lan Chen, Ju Cheng Zhang, Yun Hui Long, Ling Shi, and Na Wu. "Preparation ZnS Quantum Dots via Water-Phase Synthesis Method." Advanced Materials Research 706-708 (June 2013): 230–33. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.230.

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With water as the medium, PVP as stabilizer and ammonia as complexing agents and adjusting pH value of the solution, we report an all-aqueous synthesis of highly photoluminescent and stable ZnS quantum dots (QDs) by water-phase synthesis reaction between ZnCl2 and NaS at different temperatures and times. The optimal reaction conditions of PVP-capped ZnS QDs were obtained through experiment as follows: the concentration ZnCl2 and NaS solution both are 1 mM, (PVP):(ZnCl2) = 0.0167 (v/v), (NH3):(ZnCl2)=1:300 (v/v), the optimal reaction temperature is 40 °C, the optimal reaction time is 30 min. Wi

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17

De Silva, Sakuni M., Samitha Deraniyagala, Janitha K. Walpita, Indira Jayaweera, Saranga Diyabalanage, and Asitha T. Cooray. "Masking Ability of Various Metal Complexing Ligands at 1.0 mM Concentrations on the Potentiometric Determination of Fluoride in Aqueous Samples." Journal of Analytical Methods in Chemistry 2020 (December 18, 2020): 1–9. http://dx.doi.org/10.1155/2020/6683309.

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Fluoride is a common anion present in natural waters. Among many analytical methods used for the quantification of fluoride in natural waters, potentiometric analysis is one of the most widely used methods because of minimum interferences from other ions commonly present in natural waters. The potentiometric analysis requires the use of ionic strength adjusting buffer abbreviated as TISAB to obtain accurate and reproducible data. In most of the reported literature, higher concentrations of strong metal chelating ligands are used as masking agents generally in the concentration range of 1.0 to

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18

Ionascu, Laura, Mihaela Nicu, and Felicia Dragolici. "Structural Characterization of Immobilized Waste Forms Containing Secondary Waste from the Liquid Radioactive Waste Treatment." Advanced Materials Research 1151 (March 2019): 35–40. http://dx.doi.org/10.4028/www.scientific.net/amr.1151.35.

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Aqueous liquid radioactive waste is generated during nuclear reactor operations and during industrial and institutional application of radioisotopes. The immobilization of radioactive waste in Portland cement matrix is the most used method, applied in the world by the countries developing nuclear energy programs. The conditioning of the radioactive wastes by cementation process imposes the structural investigation by X-ray diffraction (XRD) of the samples prepared with cement and different ratio of concentrate. This paper gives useful information about the influence of complexing agents relate

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19

Kalashnikova, I. P., and V. E. Baulin. "Synthesis of Water-Soluble Phthalocyanines and Modification of their Peripheral Fragments as a Method of Directed Changes in Lipophilic-Hydrophilic Properties." Biomedical Chemistry: Research and Methods 1, no. 3 (2018): e00024. http://dx.doi.org/10.18097/bmcrm00024.

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This article brief by describes results of studies devoted to synthesis of water-soluble phthalocyanines derivatives, which are carried out by the Complexing Agents Chemistry group of IPAC RAS. Metal-free ligands and metallophthalocyanines, containing peripheral substituents with fragments of pyridine, oxybenzoic and hydroxyphenylphosphonic acids are potential photosensitizers for photodynamic therapy of cancer diseases. Methods for the modification of peripheral substituents have been developed that make it possible to synthesize phthalocyanine ligands and complexes soluble in organic solvent

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20

Godwin, J., L. S. Tella, A. N. Ebelegi, and N. Ayawei. "Acids and Anions Effects on the Distrubution of Cadmium Between Buffered Aqeuous Phases and 4,4´-(1e,1e´)-1,1´-(Ethane-1,2-Diylbis (Azan-1-Yl-1ylidene)) Bis(5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) Solutions." Oriental Journal of Chemistry 35, no. 6 (2019): 1702–11. http://dx.doi.org/10.13005/ojc/350611.

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The effect of some acids, anions and auxiliary complexing agents on the extraction of Cadmium (II) from aqueous solutions buffered to pH 7.5 using a chloroform solution of the Schiff base ligand 4,4´-(1E,1E´)-1,1´-(ethane-1,2-diylbis(azan-1-yl-1ylidene))bis(5-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-ol) (H2BuEtP) alone and in the presence of 1-(3-hydroxy-5-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl) butan-1-one (HBuP) after an equilibration time of sixty minutes was investigated. Working concentration of Cd(II) was 50mgL-1, while a range from 0.001M-3.0M was used for acid and 0.001M-1.0M for

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21

Садовников, С. И. "Тепловое расширение ограниченных полупроводниковых твердых растворов Ag-=SUB=-x-=/SUB=-Pb-=SUB=-1-x-=/SUB=-S". Физика твердого тела 61, № 6 (2019): 1060. http://dx.doi.org/10.21883/ftt.2019.06.47679.182.

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Single-phase powders of AgxPb1-xS cubic solid solutions with a maximum relative silver content up to x = 0.12 were synthesized from aqueous solutions of lead acetate and silver nitrate in the presence of a sulfidizing agent, complexing and stabilizing agents. Thermal expansion of synthesized semiconductor solid solutions AgxPb1-xS was measured for the first time by dilatometry in the temperature range of 295-580 K. It is shown that the replacement of lead atoms by silver atoms in AgxPb1-xS leads to a small decrease in the thermal expansion coefficient associated with a change in the anharmonic

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22

Girani*, Santosh, Shidallingapa Zalki, Mahantesh Kavatekar, Ajay Shahapur, and Vitthal K. Vijapure. "Development and characterization of ternary system for solubility enhancement of a second-generation COX-II inhibitor." International Journal of Bioassays 5, no. 12 (2016): 5163. http://dx.doi.org/10.21746/ijbio.2016.12.0010.

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Etoricoxib is a highly selective COX-II inhibitor, used to treat pains of different etiologies. Etoricoxib has low aqueous solubility (201g/ml) and high permeability and therefore classified as BCS class II drug. By formulating these drugs with cyclodextrins as inclusion complexes have shown to increase the bioavailability. Cyclodextrins when used as complexing agents, enhance the solubility of poor water soluble lipophilic drugs. The objective of the present work is to formulate Etoricoxibcyclodextrin complexes by using ternary systems as Citric acid, Tartaric acid and PVP K-30 in order to e

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23

Jedináková, V., P. Blažek, Z. Dvořák, A. A. Kopyrin, and V. V. Projajev. "Microamount extraction separation of Eu(III) in the presence of lanthanide macroamounts and complexing agents in the aqueous phase." Journal of Radioanalytical and Nuclear Chemistry Articles 121, no. 2 (1988): 447–53. http://dx.doi.org/10.1007/bf02041432.

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24

Chen, Yuhong, and Somenath Mitra. "Fast Microwave-Assisted Purification, Functionalization and Dispersion of Multi-Walled Carbon Nanotubes." Journal of Nanoscience and Nanotechnology 8, no. 11 (2008): 5770–75. http://dx.doi.org/10.1166/jnn.2008.215.

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Microwave-assisted purification, chemical functionalization and dispersion of multi-walled carbon nanotubes (MWNTs) are reported. To prevent sidewall functionalization, removal of residual catalyst was carried out using weak, dilute acids and complexing agents. Further covalent derivatization by attachinghydrophilic groups to the sidewall improved aqueous dispersibility to reach 1 mg/mL in deionized water and 0.5 mg/mL in ethanol. Oxidized MWNTs containing –COOH could be used for further functionalization, such as, amidation. The MWNTs were found to be less reactive and had lower solubility th

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25

Noreen, Sobia, Irsah Maqbool, Muhammad Ijaz, and Sairah Tanveer. "Cyclodextrin Inclusion Complexes: Novel Techniques to Improve Solubility of Poorly Soluble Drugs: A Review." Global Pharmaceutical Sciences Review I, no. I (2016): 29–34. http://dx.doi.org/10.31703/gpsr.2016(i-i).04.

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For a formulation scientist, the dilemma of solubility is a crucial test during the product development phase that can be resolved by opting various technological strategies. Some of the strategies that are usually applied for enhancing solubility of drugs with low aqueous solubility include micronization, solvent deposition and solid dispersion. With these approaches, some advantages as well as drawbacks, are affiliated. The strategy of complexation amid all techniques, has been applied more accurately for the improvement of dissolution profile, aqueous solubility, and bioavailability of poor

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26

Matveev, Petr I., and Vladimir G. Petrov. "Solvent Extraction of Didymium by TBP, Aliquat 336 and HDEHP in The Presence of Ca(NO3)2." Applied Sciences 10, no. 6 (2020): 2032. http://dx.doi.org/10.3390/app10062032.

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Three commercially available extractants (tri-butyl-phosphate (TBP), di-(2-ethylhexyl)phosphoric acid (HDEHP) and Aliquat 336 (a mixture of quaternary ammonium bases)) were tested for separation of Pr(III) and Nd(III) in both static and dynamic modes. In the case of HDEHP, phase stability and influence of nitric acid were considered. Extraction isotherms were constructed, and influence of water-soluble complexing agents on the separation factor was investigated for Aliquat 336. In the case of TBP, influence of calcium nitrate in aqueous phase on the extraction efficiency was investigated. Mode

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27

Muñoz, Florinella, and Clemens von Sonntag. "The reactions of ozone with tertiary amines including the complexing agents nitrilotriacetic acid (NTA) and ethylenediaminetetraacetic acid (EDTA) in aqueous solution." Journal of the Chemical Society, Perkin Transactions 2, no. 10 (2000): 2029–33. http://dx.doi.org/10.1039/b004417m.

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28

Kumberger, O., J. Riede, and H. Schmidbaur. "Beryllium Coordination to Bio-Ligands: Isolation from Aqueous Solution and Crystal Structure of a Hexanuclear Complex of Be2+ with Glycolic Acid, Na4[Be6(OCH2CO2)8]." Zeitschrift für Naturforschung B 47, no. 12 (1992): 1717–20. http://dx.doi.org/10.1515/znb-1992-1212.

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Beryllium and its compounds are highly toxic to most living cells, but the mechanisms of the interference with the biological substrates on the molecular level is not understood. From observations in (attempted) chemotherapy of beryllium poisoning using a variety of complexing agents it has been concluded that Be2+ is interacting predominantly with carboxyl as well as hydroxyl functions of protein bio-polymers, with complete deprotonation of the alkoxy or phenoxy functions involved. As a first support for this hypothesis, an analytically well-defined beryllium complex of glycolic acid has now

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29

Nenartaviciene, Giedre, Ramunas Skaudzius, Rimantas Raudonis, and Aivaras Kareiva. "Synthesis of lead-based 1212 and 3212 superconductors by an aqueous sol-gel method." Open Chemistry 7, no. 3 (2009): 362–68. http://dx.doi.org/10.2478/s11532-009-0025-z.

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AbstractThe aqueous sol-gel synthesis technique for the preparation of (Pb,Sr)Sr2(Y,Ca)Cu2O7±x (Pb-1212) and (Pb2,Cu)Sr2(Y,Ca)Cu2O8±x (Pb-3212) superconductors using two different complexing agents, namely 1,2-ethanediol and tartaric acid was studied. The phase transformations, composition and micro-structural features in the polycrystalline samples were studied by powder X-ray diffraction analysis (XRD), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). XRD analysis of the ceramic samples obtained by calcination of Pb-Sr-Y-Ca-Cu-O acetate-glycolate precursor gels in air, fo

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30

Hasany, S. M., and M. H. Chaudhary. "Studies on the adsorption behaviour of trace amounts of cerium on manganese dioxide from aqueous solutions in the presence of complexing agents." Journal of Radioanalytical and Nuclear Chemistry Articles 111, no. 1 (1987): 199–210. http://dx.doi.org/10.1007/bf02060535.

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31

Jiménez-Blasco, Uxua, Eduardo Moreno, Maura Cólera, et al. "Enhanced Performance of Zn/Br Flow Battery Using N-Methyl-N-Propylmorpholinium Bromide as Complexing Agent." International Journal of Molecular Sciences 22, no. 17 (2021): 9288. http://dx.doi.org/10.3390/ijms22179288.

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Redox flow batteries (RFB) are one of the most interesting technologies in the field of energy storage, since they allow the decoupling of power and capacity. Zinc–bromine flow batteries (ZBFB) are a type of hybrid RFB, as the capacity depends on the effective area of the negative electrode (anode), on which metallic zinc is deposited during the charging process. Gaseous bromine is generated at the positive electrode (cathode) during the charging process, so the use of bromine complexing agents (BCA) is very important. These BCAs are quaternary amines capable of complexation with bromine and g

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Böszörményi, Éva, Jorge Lado, Csilla Dudás, et al. "The structure and composition of solid complexes comprising of Nd(III), Ca(II) and D-gluconate isolated from solutions relevant to radioactive waste disposal." Pure and Applied Chemistry 92, no. 10 (2020): 1709–15. http://dx.doi.org/10.1515/pac-2019-1010.

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AbstractCertain complexing agents (such as D-gluconate, D-isosaccharinate, etc.) as well as actinides and lanthanides are simultaneously present in cementitious radioactive waste repositories and (in the presence of water) are capable of forming complex compounds. Such processes may immobilize radionuclides and are of importance in the thermodynamic modelling of the aqueous chemistry of waste repositories. Nd(III) is considered to be a suitable model for trivalent lanthanides and actinides, due to the similarity of their ionic radii. In the current work, solid complexes isolated from aqueous s

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Ananthanarayanan, R., M. Sivaramakrishna, and B. S. Panigrahi. "Trace determination of gadolinium by conductivity-based approach." Canadian Journal of Chemistry 98, no. 10 (2020): 652–58. http://dx.doi.org/10.1139/cjc-2020-0017.

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A conductivity-based technique is developed for the determination of Gd3+ in the heavy water moderators of pressurized heavy water reactors (PHWRs). The method involves monitoring extremely small shifts in conductivity, in the order of few nS/cm, due to the continuous addition of a suitable complexing agent to Gd3+ in aqueous medium. The resulting plot gives two distinct regions with vastly differing slopes. Two multidentate ligands, ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaaceticacid (DTPA), as complexing agents are compared. A high performing conductivity detector ba

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34

Karimian, Ramin, and Milad Aghajani. "Cyclodextrins and their Derivatives as Carrier Molecules in Drug and Gene Delivery Systems." Current Organic Chemistry 23, no. 11 (2019): 1256–69. http://dx.doi.org/10.2174/1385272823666190627115422.

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Cyclodextrins (CDs) are naturally occurring cyclic oligosaccharides containing six (&#945;-CD), seven (&#946;-CD), eight (&#947;-CD) and more glucopyranose units linked with &#945;-(1,4) bonds, having a terminal hydrophilic part and central lipophilic cavity. &#945;-, &#946;- and &#947;-CDs are widely used in many industrial products, technologies and analytical methods owing to their unique, versatile and tunable characteristics. In the pharmaceutical industry, CDs are used as complexing agents to enhance aqueous solubility, physico-chemical stability and bio-avail

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35

Abouelkhair, Hussain, Pedro N. Figueiredo, Seth R. Calhoun, et al. "Ternary lead-chalcogenide room-temperature mid-wave infrared detectors grown by spray-deposition." MRS Advances 3, no. 5 (2018): 291–97. http://dx.doi.org/10.1557/adv.2018.164.

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ABSTRACTTernary lead chalcogenides, such as PbSxSe1-x, offer the possibility of room-temperature infrared detection with engineered cut-off wavelengths within the important 3-5 micron mid-wave infrared (MWIR) wavelength range. We present growth and characterization of aqueous spray-deposited thin films of PbSSe. Complexing agents in the aqueous medium suppress unwanted homogeneous reactions so that growth occurs only by the heterogeneous reaction on the hydrophilic substrate. The strongly-adherent films are smooth with a mirror-like finish. The films comprise densely packed grains with tens of

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36

Tondre, Christian, and Marc Hebrant. "Kinetics of "extraction" of copper(II) by micelle-solubilized complexing agents of varying hydrophilic lipophilic balance. 2. Interfacial versus bulk aqueous-phase mechanisms." Journal of Physical Chemistry 96, no. 26 (1992): 11079–85. http://dx.doi.org/10.1021/j100205a083.

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37

Küttinger, Michael, Paulette A. Loichet Torres, Emeline Meyer, Peter Fischer, and Jens Tübke. "Systematic Study of Quaternary Ammonium Cations for Bromine Sequestering Application in High Energy Density Electrolytes for Hydrogen Bromine Redox Flow Batteries." Molecules 26, no. 9 (2021): 2721. http://dx.doi.org/10.3390/molecules26092721.

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Bromine complexing agents (BCAs) are used to reduce the vapor pressure of bromine in the aqueous electrolytes of bromine flow batteries. BCAs bind hazardous, volatile bromine by forming a second, heavy liquid fused salt. The properties of BCAs in a strongly acidic bromine electrolyte are largely unexplored. A total of 38 different quaternary ammonium halides are investigated ex situ regarding their properties and applicability in bromine electrolytes as BCAs. The focus is on the development of safe and performant HBr/Br2/H2O electrolytes with a theoretical capacity of 180 Ah L−1 for hydrogen b

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38

Dutton, Philip J., Thomas M. Fyles, and Susan J. McDermid. "Synthesis and metal ion complexation behavior of polycarboxylate 18-crown-6 ethers derived from tartaric acid." Canadian Journal of Chemistry 66, no. 5 (1988): 1097–108. http://dx.doi.org/10.1139/v88-181.

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The metal ion complexation behavior of four 18-crown-6 ethers derived from (+)- and meso-tartaric acid is examined. Preparations of a meso-crown ether diacid and of a crown ether hexacid from three units of (+)-tartaric acid are described. Acidity constants and stability constants for complexation of metal cations in aqueous solution were determined by potentiometric titration. The complexes are substantially stabilized by favourable electrostatic interactions and are of similar stability to complexes of cryptands and EDTA. The complexation behavior of the series can be rationalized in terms o

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Lehmann, Lars, Dominik Höhlich, Thomas Mehner, and Thomas Lampke. "Irregular Electrodeposition of Cu-Sn Alloy Coatings in [EMIM]Cl Outside the Glove Box with Large Layer Thickness." Coatings 11, no. 3 (2021): 310. http://dx.doi.org/10.3390/coatings11030310.

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Thick Cu−Sn alloy layers were produced in an [EMIM]Cl ionic-liquid solution from CuCl2 and SnCl2 in different ratios. All work, including the electrodeposition, took place outside the glovebox with a continuous argon stream over the electrolyte at 95 °C. The layer composition and layer thickness can be adjusted by the variation of the metal-salts content in the electrolyte. A layer with a thickness of up to 15 µm and a copper content of up to ωCu = 0.86 was obtained. The phase composition was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray fluorescence (

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Soomro, Rubina, M. Jamaluddin Ahmed, Najma Memon, and Humaira Khan. "A Simple and Selective Spectrophotometric Method for the Determination of Trace Gold in Real, Environmental, Biological, Geological and Soil Samples Using Bis (Salicylaldehyde) Orthophenylenediamine." Analytical Chemistry Insights 3 (January 2008): ACI.S977. http://dx.doi.org/10.4137/aci.s977.

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A simple high sensitive, selective, and rapid spectrophotometric method for the determination of trace gold based on the rapid reaction of gold(III) with bis(salicylaldehyde)orthophenylenediamine (BSOPD) in aqueous and micellar media has been developed. BSOPD reacts with gold(III) in slightly acidic solution to form a 1:1 brownish-yellow complex, which has an maximum absorption peak at 490 nm in both aqueous and micellar media. The most remarkable point of this method is that the molar absorptivities of the gold-BSOPD complex form in the presence of the nonionic TritonX-100 surfactant are almo

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Grootveld, Martin, Edward Lynch, Georgina Page, et al. "Potential Advantages of Peroxoborates and Their Ester Adducts Over Hydrogen Peroxide as Therapeutic Agents in Oral Healthcare Products: Chemical/Biochemical Reactivity Considerations In Vitro, Ex Vivo And In Vivo." Dentistry Journal 8, no. 3 (2020): 89. http://dx.doi.org/10.3390/dj8030089.

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Peroxides present in oral healthcare products generally exert favourable protective activities against the development and progression of tooth decay, plaque, gingivitis, and halitosis, etc. However, despite the high level of research focus on hydrogen and carbamide peroxides as therapeutically active (and tooth-whitening) agents, to date the use of alternative chemical forms of peroxides such as peroxoborates for these purposes has received only scant attention. Intriguingly, peroxoborate and its esters with polyols, such as glycerol, have a very diverse chemistry/biochemistry in aqueous solu

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BIAN, Z. Q., X. B. XU, J. B. CHU, Z. SUN, Y. W. CHEN, and S. M. HUANG. "STUDY OF CHEMICAL BATH DEPOSITION OF ZnS THIN FILMS WITH SUBSTRATE VIBRATION." Surface Review and Letters 15, no. 06 (2008): 821–27. http://dx.doi.org/10.1142/s0218625x08012098.

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An improved chemical bath deposition (CBD) technique has been provided to prepare zinc sulfide ( ZnS ) thin films on glass substrates deposited at 80–82°C using a mixed aqueous solution of zinc sulfate, ammonium sulfate, thiourea, hydrazine hydrate, and ammonia at the alkaline conditions. Both the traditional magnetic agitation and the substrates vibration by hand frequently were done simultaneously during the deposition. The substrates vibration reduced the formation and residence of gas bubbles on the glass substrates during growth and resulted in growth of clean ZnS thin films with high qua

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Khan, Humaira, M. Jamaluddin Ahmed, and M. Iqbal Bhanger. "A simple spectrophotometric method for the determination of trace level lead in biological samples in the presence of aqueous micellar solutions." Spectroscopy 20, no. 5-6 (2006): 285–97. http://dx.doi.org/10.1155/2006/269568.

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A very simple, ultra-sensitive and fairly selective new spectrophotometric method has been developed for the rapid determination of lead(II) at ultra-trace level using 1,5-diphenylthiocarbazone (dithizone) in presence of aqueous micellar solutions. The proposed method enabled the determination of lead down to µg l−1in human blood and urine in aqueous media without resource of any “clean-up” step. The most remarkable point of this method is that the presence of micellar system avoids the previous steps of solvent extraction and reduces the cost, toxicity while enhancing the sensitivity, selecti

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Tong, Haijie, Fobang Liu, Alexander Filippi, et al. "Aqueous-phase reactive species formed by fine particulate matter from remote forests and polluted urban air." Atmospheric Chemistry and Physics 21, no. 13 (2021): 10439–55. http://dx.doi.org/10.5194/acp-21-10439-2021.

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Abstract. In the aqueous phase, fine particulate matter can form reactive species (RS) that influence the aging, properties, and health effects of atmospheric aerosols. In this study, we explore the RS yields of aerosol samples from a remote forest (Hyytiälä, Finland) and polluted urban locations (Mainz, Germany; Beijing, China), and we relate the RS yields to different chemical constituents and reaction mechanisms. Ultra-high-resolution mass spectrometry was used to characterize organic aerosol composition, electron paramagnetic resonance (EPR) spectroscopy with a spin-trapping technique was

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de Melo, Fernando, Sabrina Almeida, and Henrique Toma. "Magnetic Nanohydrometallurgy Applied to Lanthanide Separation." Minerals 10, no. 6 (2020): 530. http://dx.doi.org/10.3390/min10060530.

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Lanthanides play an important role in modern technology because of their outstanding optical, electronic, and magnetic properties. Their current hydrometallurgical processing involves lixiviation, leading to concentrates of elements whose separation requires exhaustive procedures because of their similar chemical properties. In this sense, a new nanotechnological approach is here discussed, involving the use of iron oxide nanoparticles functionalized with complexing agents, such as diethylenetriaminepentaacetic acid (DTPA), for carrying out the magnetic extraction and separation of the lanthan

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Bondareva, L. P., Y. S. Peregudov, and A. V. Astapov. "Equilibrium of aliphatic amino acids on ion exchangers forming complexes in the presence of copper (II) and nickel (II) cations." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 3 (2019): 217–24. http://dx.doi.org/10.20914/2310-1202-2019-3-217-224.

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The task of isolating and separating amino acids from aqueous solutions exists in various industries. The traditional method of isolation is ligand exchange chromatography. When choosing a cation for ligand-binding chromatography based on its binding strength with the ion exchanger, often used as a sulfonated polystyrene ion exchanger keeps the copper (II) firmly enough, and therefore, it is easily replaced by other cations. Chelating ion exchangers charge cations of copper (II), which hold these ions firmly enough. In this case, separating a mixture of substances, it is due to differences in

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Belyakova, L. A. "Encapsulation of benzene carboxylic acids using cyclodextrins." Himia, Fizika ta Tehnologia Poverhni 12, no. 1 (2021): 40–51. http://dx.doi.org/10.15407/hftp12.01.040.

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The encapsulation of medicinal substances in various polymers is a common way to increase their thermal, hydrolytic, and chemical stability. However, the bioavailability of the encapsulated drugs decreases. The solution to this important problem can be the preparation of nanocapsules of medicinal substances using complexing agents, for example, cyclodextrins. The purpose of this work is to study the possibility of encapsulation of benzoic, salicylic, and β-resorcylic acids using α- and β-cyclodextrins. The interaction of benzene carboxylic acids with cyclodextrins in aqueous solutions at 20–30

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Lin, Lianzhen, and Chung-Yun Hse. "Liquefaction of CCA-treated wood and elimination of metals from the solvent by precipitation." Holzforschung 59, no. 3 (2005): 285–88. http://dx.doi.org/10.1515/hf.2005.047.

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Abstract Spent chromated copper arsenate (CCA)-treated wood was liquefied in polyethylene glycol 400/glycerin (2:1w/w). Sulfuric acid (95–98%) and ferrous salts (FeSO4·7H2O or FeCl2·4H2O) were used as catalysts and additives, respectively. The resulting liquefied CCA-treated wood was diluted with aqueous solvents and was then mixed with complexion/precipitation agents, followed by precipitation or filtration to remove the toxic metal-bearing sediment. As a result, more than 90% of Cu, Cr or As was removed.

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Pilaquinga, Fernanda, Dennis Amaguaña, Jeroni Morey, et al. "Synthesis of Silver Nanoparticles Using Aqueous Leaf Extract of Mimosa albida (Mimosoideae): Characterization and Antioxidant Activity." Materials 13, no. 3 (2020): 503. http://dx.doi.org/10.3390/ma13030503.

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The search for sensitive and rapid analytical techniques for the determination of natural antioxidants is an area in constant growth due, among other aspects, to the complexity of plant matrices. In this study, silver nanoparticles prepared with the aqueous extract of Mimosa albida leaves were used to assess their polyphenolic content and antioxidant capacity. Silver nanoparticles were characterized by different techniques. As a result, nanoparticles of 6.5 ± 3.1 nm were obtained. The total phenolic content in the extract was 1320.4 ± 17.6 mg of gallic acid equivalents GAE· 100 g−1 and in the

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Schröppel-Meier, G., and W. M. Kaiser. "Amperometric Titration Largely Overestimates Chloride Concentrations in Chloroplast Extracts." Zeitschrift für Naturforschung C 42, no. 9-10 (1987): 1109–12. http://dx.doi.org/10.1515/znc-1987-9-1018.

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Determination of chloride contents in aqueously isolated chloroplasts from spinach by amperometric titration indicated chloride concentrations of 60 to 100 mmol 1-1 (based on a chloroplast volume of 25 μl mg-1 chlorophyll). However, when analyzed by anion chromatography, chloride contents in chloroplasts were much lower (1-8 mmol 1-1). In leaf extracts chloride concentrations obtained with both methods were rather similar. Boiling of chloroplast extracts prior to chloride titration reduced indicated chloride contents by a factor of three or four, but did not change results obtained with anion

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