Two gasotight cells with appropriate electrodes were constructed of transparent polypropyletle and kep! at con,ltalll temperature in a water bath. Simultaneous measuren)ents o1' pH, conductivity and temperature as a function of time were can*ted out in the first cell containing a solutiolt with the molar ratio (TMOS:H,O:HCI) of 1:4:10 '~ or 1:4:11) ~ 4. The H' ion limiting current was ~riodical...

A proposed method for estimating the electrical conductivity of cement paste pore solution at 25 °C is based on the concentrations of OR -, K + and Na + .The approach uses an equation that is a function of the solution ionic strength, and requires a single coefficient for each ionic species. To test the method, the conductivity of solutions containing mixtures of potassium hydroxide and sodium ...

Ionic conductivity and molar volume measurements were performed on H(2)O ice at high pressure (P) and temperature (T) in a resistive-heated diamond anvil cell. The conductivity data obtained at P = 20-62 GPa, T = 304-930 K are well fitted with a single Arrhenius equation. Isothermal volume measurements at T = 873 K, P = 30-101 GPa indicate that H(2)O ice undergoes phase transitions at P = 50 GP...

A novel type of flexible [Fe3O4/PANI/PMMA]@{[Eu(BA)3phen + Tb(BA)3phen]/PMMA} (PMMA = polymethyl methacrylate, BA = benzoic acid, phen = phenanthroline, PANI = polyaniline) belt-shaped coaxial microcable possessing electrical conductivity, magnetism and color-tunable photoluminescence has been successfully fabricated by electrospinning technology using a specially designed coaxial spinneret. Ev...

Neutralization of an organic super-strong base, 1,8-diazabicyclo-[5,4,0]-undec-7-ene (DBU), with different Brønsted acids affords a novel series of protic ionic liquids (PILs) with wide variations in the ΔpK(a) of the constituent amine and acids. The physicochemical properties of these PILs, such as thermal properties, density, conductivity, viscosity, self-diffusion coefficient, vibrational st...

Despite their importance in biological and technological contexts, copolymeric polyelectrolytes (or "copolyelectrolytes") continue to present challenges to theorists and experimentalists. The first results of a unified approach to the kinetics and mechanisms of copolyelectrolyte synthesis and the physical characteristics of the resulting polymers are presented. The free radical copolymerization...

This research includes the preparation of Schiff bases from heterocyclic compounds using furfural by traditional method (sublimation), where mono- and diamine were used. The diagnosed FT-IR, 1H-NMR, 13C-NMR, UV-Vis Mass, SEM to determine shape molecule whether it is nanoscale. biological activity that showed moderate high inhibitory ratios also evaluated, measured molar electrical conductivity ...

Molecular simulations and theories are important tools for studying electrolyte solutions. In this work, molecular dynamics with one of the most widely used force field combination water alkali halide monovalent ion parameters were first conducted aqueous sodium chloride solutions to predict density, self-diffusion coefficients molar conductivity. Then radial distribution functions analyzed obt...

Conductivity plays vital role in drug diffusion. Thermodynamic parameters affected by substituents of drug. 1, 3, 5 –triazinothiocarbamide (1a) have been investigated using conductometrically carried out at different molar concentrations. This work highlights investigation G, K and µ values. The thermodynamic viz. ΔH, ΔS ∆G for ion pair formation determine from the value association constant. t...