Isothermal compressibility and internal pressure studies of some non-electrolytes in aqueous solutions at low temperatures

2007 ◽  
Vol 39 (4) ◽  
pp. 667-673 ◽  
Author(s):  
Sudhakar S. Dhondge ◽  
L. Ramesh
Keyword(s):  
Aqueous Solutions ◽  
Internal Pressure ◽  
Low Temperatures ◽  
Isothermal Compressibility

Redox reaction mediated direct synthesis of hierarchical flower-like CuO spheres anchored on electrospun poly(vinylidene difluoride) fiber surfaces at low temperatures

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 100228-100234 ◽  
Author(s):  
Yun-Yang Lee ◽  
Hsieh-Yu Li ◽  
Shih-Jiuan Chiu ◽  
Wen-Li Liang ◽  
Pi-Li Yeh ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Rhodamine B ◽  
Redox Reaction ◽  
Low Temperatures ◽  
Direct Synthesis ◽  
Catalytic Membranes ◽  
Vinylidene Difluoride

Flower-like CuO spheres anchored on electrospun PVDF fiber surfaces as catalytic membranes for the photodegradation of rhodamine B aqueous solutions.

Thermodynamic studies of some non-electrolytes in aqueous solutions at low temperatures

2008 ◽  
Vol 40 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Sudhakar S. Dhondge ◽  
Chandrashekhar Pandhurnekar ◽  
L. Ramesh
Keyword(s):  
Aqueous Solutions ◽  
Low Temperatures ◽  
Thermodynamic Studies

scholarly journals Acoustic, thermal and optical properties of organic based disodium tartrate salt

2021 ◽  
Vol 2 (1) ◽  
pp. 012-027
Author(s):  
M. Sathish ◽  
K. Venkataramanan ◽  
R. Padmanaban ◽  
Helan Ruth ◽  
K. Vadivel ◽  
...  
Keyword(s):  
Optical Properties ◽  
Aqueous Solutions ◽  
Internal Pressure ◽  
Ultrasonic Velocity ◽  
Relative Viscosity ◽  
Adiabatic Compressibility ◽  
Lower Percentage ◽  
Wada’S Constant ◽  
Different Temperatures ◽  
Solvent Molecules

In this work, acoustic, thermal, and optical properties were tested on the different concentrations of the Disodium Tartrate solutions. First, the viscosity studies were analyzed for the Disodium tartrate in the concentration range from 2% to 20% with different temperatures 303K, 308K, 313K, and 318K. It was noted that the relative viscosity and the activation energy of the prepared compound increase with increases in concentration and decreases with temperature increases. The properties like density and ultrasonic velocity are varied when increases the concentration of the aqueous solutions of Disodium Tartrate. In this study, the values of adiabatic compressibility show an inverse behavior when compared with ultrasonic velocity due to the interaction between solute and solvent molecules. Also observed that the inter-molecular free length is maximum for a lower percentage. The free volume for the compound is maximum at 2% and a minimum of 20%, since it reduces when the internal pressure increases. It was revealed that the classical absorption coefficient and relaxation time for Disodium Tartrate is minimum for lower percentage and minimum for a higher percentage. The interactions between the solute and solvent are confirmed through the property like specific Acoustical impedance. It was noted that the increase in internal pressure increases the concentration of the compound. The ion-solvent interaction was discussed by the relative association study, thus the values of relative association increases with an increase in concentration. The Rao’s and Wada’s constant increases linearly in aqueous solutions of Disodium Tartrate for the entire system.

scholarly journals Dissolution of cellulose using a combination of hydroxide bases in aqueous solution

Cellulose ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 101-112 ◽  
Author(s):  
Beatrice Swensson ◽  
Anette Larsson ◽  
Merima Hasani
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Microcrystalline Cellulose ◽  
Low Temperatures ◽  
Dynamic Rheology ◽  
Organic Base ◽  
Single Base ◽  
Solvent Quality ◽  
Solvent Stability

Abstract In order to further understand the role of the cation when dissolving cellulose in aqueous solutions of hydroxide bases, different bases were combined in solution. Up to 5 wt.% of microcrystalline cellulose was dissolved using a combination of NaOH and the organic base tetramethylammonium hydroxide (TMAH) in water at low temperatures. Thermoscans of solutions containing both NaOH(aq) and TMAH(aq) indicated that cellulose interaction with TMAH seems to be favoured over NaOH. Dynamic rheology measurements of the solutions revealed that combining the two bases delayed gelation significantly when compared to cellulose dissolved in NaOH(aq) or TMAH(aq) alone. Intrinsic viscosity of cellulose in the combined NaOH- and TMAH(aq) solutions was slightly higher than that of the single-base solutions, indicating a slight increase in solvent quality. This shows that combining bases may lead to synergies that improve solvent stability without requiring the use of other additives. Graphic abstract

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