نتایج جستجو برای: ionic activity coefficient

تعداد نتایج: 1334422  

Journal: :journal of the iranian chemical research 0
ming lu college of chemical engineering, nanjing university of science and technology, nanjing 210094, pr china hui jiang college of chemical engineering, nanjing university of science and technology, nanjing 210094, pr china

in this work, benzyl alcohol was obtained in 96% excellent yield by hydrolysis of benzyl chloride catalyzedby the recyclable temperature-dependant phase-separation system that comprised the ionic liquid peg1000-dail[bf4], toluene and ferric sulfate under homogeneous catalysis in aqueous media. this novel methodnot only enhanced the yield, but also made the operating units easy workup. the catal...

Journal: :analytical and bioanalytical chemistry research 0
biuck habibi electroanalytical chemistry laboratory, department of chemistry, faculty of sciences, azarbaijan shahid madani university, tabriz 53714-161, iran zahra ayazi electroanalytical chemistry laboratory, department of chemistry, faculty of sciences, azarbaijan shahid madani university, tabriz 53714-161, iran maryam dadkhah electroanalytical chemistry laboratory, department of chemistry, faculty of sciences, azarbaijan shahid madani university, tabriz 53714-161, iran

in the present work, an efficient modified carbon-ceramic electrode by multi-walled carbon nanotubes/ionic liquid nanocomposite (mwcnts/il/cce) was prepared through a simple and repeatable procedure. the introduced modified electrode was used for the study of the electrochemical behaviour and determination of tryptophan (trp) in the presence of uric acid (ua) using cyclic voltammetry (cv), diff...

2012
Mahesh Kumar Teli Rajanikant G K

UNLABELLED BACKGROUND Coronary heart disease continues to be the leading cause of mortality and a significant cause of morbidity and account for nearly 30% of all deaths each year worldwide. High levels of cholesterol are an important risk factor for coronary heart disease. The blockage of 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase activity by small molecule inhibitors has bee...

Journal: :journal of physical & theoretical chemistry 2007
m. aghaie b.sh. broojeni

using solvent evaporating and atomic emission spectrophotometric methods, the solubility of li2co3 in waterat 25°c was determined. comparing the value of thermodynamic solubility product constant, ksp(th),(ksp(tn) = exp(—ag.ss/rt)) of the mentioned salt to the value which is obtained from the observed solubility,shnoll-1 , and activity coefficients, f+ and f, which are estimated upon the extend...

Journal: :physical chemistry research 2015
bahram ghalami-choobar parya mossayyebzadeh-shalkoohi

in this paper, the thermodynamic properties of the aqueous mixed electrolyte system containing 1-butyl-3-methylimidazolium chloride ([bmim]cl) and nacl are reported based on the potentiometric method. the potentiometric measurements were performed on the galvanic cells without liquid junction of the type:ag-agcl [bmim]cl (m1), nacl(m2), h2o│il-ise, over total ionic strengths from 0.0025 to 2.00...

Journal: :The Journal of Physical Chemistry 1980

2003
H. W. Brinkman H. Verweij

Oxygen diffusion in the oxygen ionic conductor yttria-stabilized zirconia is investigated by means of the molecular dynamics simulation technique. Oxygen ions migrate by means of a discrete hopping process, mainly between neighbouring tetrahedral sites. Diffusion appears to occur in a short time and a long time regime. Only when the oxygen ions have moved over distances much larger than the cha...

2016
Andrew J. Bell

The recently proposed Equivalent Dipole Model for describing the electromechanical properties of ionic solids in terms of 3 ions and 2 bonds has been applied to PZT ceramics and lead-free single crystal piezoelectric materials, providing analysis in terms of an effective ionic charge and the asymmetry of the interatomic force constants. For PZT it is shown that, as a function of composition acr...

2000
Per Lyngs Hansen Rudi Podgornik Adrian Parsegian

The osmotic coefficient of B-DNA in water may, in moderately dilute solutions, deviate as much as 100 % from predictions based on a simple ’counterion condensation’ theory. We determine the results for osmotic properties via a cell model description of the ionic atmosphere near a cylindrical polyelectrolyte. The cell model predictions for the osmotic properties disagree with predictions based o...

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