Viscosity and Molar Volume of Potassium Thiocyanate + Sodium Thiocyanate + Acetamide Melt Systems

1998 ◽  
Vol 43 (2) ◽  
pp. 148-151 ◽  
Author(s):  
Gautam Kalita ◽  
Nashiour Rohman ◽  
Sekh Mahiuddin
Keyword(s):  
Molar Volume ◽  
Potassium Thiocyanate ◽  
Sodium Thiocyanate

Mixed alkali effect in sodium thiocyanate–potassium thiocyanate – acetamide melt systems

1996 ◽  
Vol 74 (5) ◽  
pp. 760-765 ◽  
Author(s):  
Sekh Mahiuddin
Keyword(s):  
Electrical Conductivity ◽  
Molar Volume ◽  
Potassium Thiocyanate ◽  
Sodium Thiocyanate ◽  
Volume Data ◽  
Intrinsic Volumes ◽  
Mixed Alkali ◽  
Free Volume Model ◽  
Mixed Alkali Effect ◽  
Solvated Ions

Electrical conductivity and molar volume of the 0.25[xNaSCN + (1 −x)KSCN] + 0.75CH3CONH2 systems were measured as functions of temperature [Formula: see text] and composition (x = 0.0 – 1.0 mol fraction). Temperature dependence of the electrical conductivity was non-Arrhenius in nature and has been analysed by using the Vogel–Tammann–Fulcher (VTF) equation. Molar volume data were fitted to an equation similar to the VTF equation based on the free volume model. Molar volumes and intrinsic volumes were found to be additive in nature. Electrical conductivity isotherms deviate from linearity in different fashion for different temperature regions. The onset of the mixed alkali effect is governed by the anion polarization effect, by a contribution of the auto-dissociated molten acetamide, and by polymeric-type solvated ions. Key words: electrical conductivity, sodium thiocyanate, potassium thiocyanate, acetamide, mixed alkali effect.

Thermal properties of poly(ethylene oxide) complexed with sodium thiocyanate and potassium thiocyanate

1987 ◽  
Vol 20 (12) ◽  
pp. 3023-3034 ◽  
Author(s):  
C. Robitaille ◽  
S. Marques ◽  
D. Boils ◽  
J. Prud'homme
Keyword(s):  
Thermal Properties ◽  
Ethylene Oxide ◽  
Potassium Thiocyanate ◽  
Sodium Thiocyanate ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Conductivity Study of Some Thiocyanate Salts in Aqueous Binary Mixtures of Tetrahydrofuran and 1,3-Dioxolane at 298.15 K

2010 ◽  
Vol 224 (06) ◽  
pp. 827-841 ◽  
Author(s):  
Riju Chanda ◽  
Mahendra Nath Roy
Keyword(s):  
Binary Mixtures ◽  
Structural Changes ◽  
Ion Pairs ◽  
Mixed Solvents ◽  
Tetrabutylammonium Bromide ◽  
Electrical Conductance ◽  
Ammonium Thiocyanate ◽  
Potassium Thiocyanate ◽  
Sodium Thiocyanate ◽  
Solvent Mixtures

AbstractElectrical conductance measurements are reported for different thiocyanate salts, viz. ammonium thiocyanate (NH4CNS), sodium thiocyanate (NaCNS) and potassium thiocyanate (KCNS), sodium bromide (NaBr), sodium tetraphenylborate (NaBPh4) and tetrabutylammonium bromide (Bu4NBr) in different mole fraction of water-tetrahydrofuran (THF) and water-1,3-dioxolane (1,3-DXL) binary mixtures at 298.15 K. The conductance data have been analyzed by the Fuoss conductance equation in terms of the limiting molar conductance (Λ0), the association constant (KA) and the association diameter (R). The limiting ionic conductances have been estimated from the appropriate division of the limiting molar conductivity value of the “reference electrolyte” Bu4NBPh4. Slight ionic association was found for all these electrolytes in these solvent mixtures. The results have been interpreted in terms of the formation of ion-pairs of ion–solvent interactions and structural changes in the mixed solvents.

scholarly journals A Brief Review of Fly-ash Based Geopolymer Concrete

2021 ◽  
pp. 230-237
Author(s):  
Vaibhavi G Galande ◽  
Harshavardhan U Kamble
Keyword(s):  
Fly Ash ◽  
Thermal Power ◽  
Acid Resistance ◽  
Potassium Thiocyanate ◽  
Sodium Thiocyanate ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
Concrete Material ◽  
Concrete Mix Design ◽  
Test Result

Geopolymer concrete can be the future of the conventional concrete and it can be used as replacement agent instead of conventional concrete in construction work along with that the GPC is eco friendly in nature as it does not emits CO2 in atmosphere so it is helpful to reduce the Greenhouse effect. The material used for the manufacturing of GPC are Binder’s and Actuators. Birder’s are obtained from the thermal power plant also known as fly ash and actuator consist of the sodium silicate and sodium hydroxide, calcium chloride, sodium thiocyanate, potassium thiocyanate, etc. By combing these acceleration and Binder’s with other concrete material the process of Geopolymeration starts. The objective of these study is to give a detailed review on the geopolymer concrete mix design, compressive behavior, flexural and split tensile behavior and chemical acid resistance when immersed in sopheric acid and nitric acid by using various research paper and the test result difference of conventional concrete and geopolymer concrete. Based on that a review is prepared.

scholarly journals Behavior and properties of water in silicate melts under deep mantle conditions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bijaya B. Karki ◽  
Dipta B. Ghosh ◽  
Shun-ichiro Karato
Keyword(s):  
Electrical Conductivity ◽  
Molar Volume ◽  
Water Solution ◽  
Pure Water ◽  
Electrical Conductance ◽  
Water Structure ◽  
Bulk Water ◽  
Silicate Melts ◽  
Pressure Regime ◽  
Low Pressures

AbstractWater (H2O) as one of the most abundant fluids present in Earth plays crucial role in the generation and transport of magmas in the interior. Though hydrous silicate melts have been studied extensively, the experimental data are confined to relatively low pressures and the computational results are still rare. Moreover, these studies imply large differences in the way water influences the physical properties of silicate magmas, such as density and electrical conductivity. Here, we investigate the equation of state, speciation, and transport properties of water dissolved in Mg1−xFexSiO3 and Mg2(1−x)Fe2xSiO4 melts (for x = 0 and 0.25) as well as in its bulk (pure) fluid state over the entire mantle pressure regime at 2000–4000 K using first-principles molecular dynamics. The simulation results allow us to constrain the partial molar volume of the water component in melts along with the molar volume of pure water. The predicted volume of silicate melt + water solution is negative at low pressures and becomes almost zero above 15 GPa. Consequently, the hydrous component tends to lower the melt density to similar extent over much of the mantle pressure regime irrespective of composition. Our results also show that hydrogen diffuses fast in silicate melts and enhances the melt electrical conductivity in a way that differs from electrical conduction in the bulk water. The speciation of the water component varies considerably from the bulk water structure as well. Water is dissolved in melts mostly as hydroxyls at low pressure and as –O–H–O–, –O–H–O–H– and other extended species with increasing pressure. On the other hand, the pure water behaves as a molecular fluid below 15 GPa, gradually becoming a dissociated fluid with further compression. On the basis of modeled density and conductivity results, we suggest that partial melts containing a few percent of water may be gravitationally trapped both above and below the upper mantle-transition region. Moreover, such hydrous melts can give rise to detectable electrical conductance by means of electromagnetic sounding observations.

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