For the first time solution enthalpies of Al, H3PO4, and AlH2P3O10 × 2H2O in 2 mol dm−3 NaOH have been measured as following: ΔsolH°1 = −404.75 ± 4.36 kJ mol−1; ΔsolH°2 = −189.48 ± 0.54 kJ mol−1; ΔsolH°3 = −238.95 ± 3.32 kJ mol−1. On the basis of experimental data the standard molar en...

The aim of this study was to synthesize a non-stoichiometric aluminum phosphate coating with high thermal stability. The aluminum phosphate precursor solution, in the presence of polyvinylpyrrolidone (PVP) as a crack-limiting agent was prepared by a sol–gel process and then applied on AISI 304 ...

The hydrolysis of AlN powder in a dilute aqueous suspension was studied by following the pH vs. time in different media. The results show that phosphoric acid is effective in protecting AlN powder at room temperature, whereas at elevated temperatures hydrolysis takes place. When silicic acid or ...

In this study, a low-temperature curing aluminium phosphate coating was developed on a Ti–6Al–4V alloy by prolonged curing. The coating was composed of a phosphate binder, a [email protected]2O3 core-shell curing agent, and an Al filler. The phosphate binder was produced by the reaction betwee...

Digital image correlation (DIC) method has been widely used for measurement in high temperature environment, where speckle pattern that can withstand high temperature and maintain good stability is required. In this work we develop a simple method to fabricate speckle pattern for high temperatur...

In the present work, phosphate-bonded porous silicon carbide (SiC) ceramics were prepared by using aluminum dihydrogen phosphate as binder. The morphologies, phase composition, microstructures, mechanical strength, porosity and bulk density of the porous ceramics were investigated. It was found ...

The influence of the composition and concentration of individual basic electrolytes on the electrode processes of the indium(III)/indium(0) (Hg) redox pair was studied. The results were mainly obtained using square-wave voltammetry because cyclic voltammetry does not seem to be a proper method o...

Three planar miniaturized perchlorate membrane sensors (3×5 mm2) are prepared using a flexible Kaptan substrate coated with nitron-perchlorate (NT-ClO4) [sensor 1], methylene blue-perchlorate (MB-ClO4) [sensor II] and indium-porphyrin (In-Por) [sensor III] as electroactive materials in PVC memb...

Recent work has shown that electrochromic WO3 films, backed by In2O3:Sn (ITO) and immersed in a lithium-ion-conducting electrolyte, can attain unprecedented electrochemical cycling durability after potentiostatic pretreatment at high voltage. Here we demonstrate that this intriguing feature is a...

The aerobic oxidation of 5-hydroxymethylfurfural (HMF) was performed on an activated carbon-supported ruthenium (Ru/C) catalyst in water. The presence of Mg-Al hydrotalcite (HT, Mg/Al molar ratio = 3/1) as a base afforded higher selective oxidation of HMF to 5-formyl-2-furancarboxylic acid (FFCA...

5-Formyl-2-furancarboxylic acid (FFCA) is increasingly important building blocks, which has promising applications in fuels, chemical intermediates, drugs, etc. However, highly selective oxidation of 5-hydroxymethylfurfural (5-HMF) to FFCA by enzyme catalysis is a new challenging problem due to ...

Utilizing sustainable biomass to partly replace the fossil feedstock as the carbon source of chemical industry has been well acknowledged because of the scarcity of the fossil resources. This work introduced a novel route for the synthesis of 5-formyl-2-furancarboxylic acid (FFA) from renewable ...

A series of 10 thiourea derivatives have been synthesized by the reaction of aromatic amine with a substituted aryl (compounds 1–3, 6–8) and alkylphenyl (4, 5, 9, 10) isothiocyanates. Their in vitro and in vivo pharmacological properties were studied. Among the evaluated compounds, two display...

The photo-physical properties of five new para-phenyl substituted derivatives of 3-(7-dimethylamino)coumarin N-phenylsemicarbazone with various electron-withdrawing substituents R (RF, Br, CF3, CN or NO2) in the para-position on the phenyl ring were investigated in solvents and in polymer matric...

In the present work, the solvent extraction of bismuth with mixtures of acidic phosphorus extractants, di(2-ethylhexyl) phosphoric acid (D2EHPA) and 2-ethylhexylphosphonic acid mono-(2-ethylhexyl) ester (HEHEHP), with some other extractants was investigated including sec-octylphenoxyacetic acid ...

Extraction behavior of Eu(III) from nitric acid medium was studied in a binary solution of tetra bis(2-ethylhexyl)diglycolamide (TEHDGA) and an acidic extractant (HA) present in n-dodecane (n-DD). The acidic extractants chosen were bis(2-ethylhexyl)phosphoric acid (HDEHP), bis(2-ethylhexyl)phosp...

Synergistic solvent extraction of nickel by 2-hydroxy-5-nonylacetophenone oxime (Mextral 84H, denoted as HL) mixed with organic acids (denoted as HA) containing neodecanoic acid (Versatic 10) and bis(2-ethylhexyl) phosphoric acid (P204) diluted in aliphatics was comparatively studied. The synerg...

This work examines the extraction of rare earths (Ce, Pr, Nd, Sm, Tb, Dy, Ho, Er, Yb, Lu and Y) by 2-ethylhexyl phosphonic acid 2-ethylhexyl mono-ester (EHEHPA), Cyanex 272, Cyanex 572 and mixtures of EHEHPA and Cyanex 272, to determine whether the mixed extractants could be beneficial to indust...

Measurements of dimerization constants (Kd,HR) and distribution constants (KD,HR) of bis(2-ethylhexyl)phosphinic acid (PIA-8) in three kinds of organic diluents were carried out by a potentiometric two-phase titration technique at 298 ± 0.1 K. Extraction of iron(III), zinc(II), copper(II), mang...

In this study, separation of copper ion (Cu2+) from aqueous solution using two phosphorous based extractants (tri‑n‑butyl phosphate and di‑2‑ethylhexyl phosphoric acid) was aimed. The parameters monitored under the equilibrium study were initial copper concentration, extractant concentration, an...