Volumetric and acoustic methods for investigating molecular interactions of antibiotic drug doxycycline hyclate in water and in aqueous solution of sodium chloride and potassium chloride at different temperatures (293.15–313.15) K

2019 ◽  
Vol 284 ◽  
pp. 241-251 ◽  
Author(s):  
Shashi Kant Lomesh ◽  
Vikas Nathan ◽  
Madhu Bala ◽  
Poonam Thakur
Keyword(s):  
Aqueous Solution ◽  
Sodium Chloride ◽  
Potassium Chloride ◽  
Molecular Interactions ◽  
Doxycycline Hyclate ◽  
Antibiotic Drug ◽  
Acoustic Methods ◽  
Different Temperatures

scholarly journals Corrosion Behavior of CoCrFeNiTax Alloys in 1 M Sodium Chloride Aqueous Solution

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5157
Author(s):  
Chun-Huei Tsau ◽  
Rong-Wei Hsiao ◽  
Tien-Yu Chien
Keyword(s):  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Sodium Chloride ◽  
Corrosion Behavior ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Electrochemical Impedance ◽  
Eutectic Structure ◽  
Different Temperatures

This paper investigates the effects of Ta content on the microstructures, hardness and corrosion behavior of as-cast CoCrFeNiTax alloys. The results indicate that the addition of Ta can change the microstructures of these alloys to dual-phased structures (FCC + HCP), as well as increasing their hardness. This study uses constant galvanostatic/potentiometric methods to measure the polarization curves of CoCrFeNiTa0.1, CoCrFeNiTa0.3 and CoCrFeNiTa0.5 alloys in deaerated 1 M sodium chloride solution at different temperatures. Electrochemical impedance spectroscopy is also used to analyze these alloys in sodium chloride solution. The results indicate that the CoCrFeNiTa0.5 alloy has a eutectic structure and the highest hardness. Furthermore, although the CoCrFeNiTa0.5 alloy has the best corrosion resistance, the CoCrFeNiTa0.3 alloy has the best pitting resistance among these alloys.

scholarly journals Molecular Interactions of Piperidinium Based Ionic Liquids with Water/Alcohol at Different Temperatures

2020 ◽  
Vol 33 (1) ◽  
pp. 195-202
Author(s):  
G.V. Gangadhara Rao ◽  
Shaik Babu
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquids ◽  
Molar Volume ◽  
Molecular Interactions ◽  
Isentropic Compressibility ◽  
Acoustic Parameters ◽  
Fundamental Parameters ◽  
Different Temperatures ◽  
Excess Molar Isentropic Compressibility ◽  
Water Alcohol

In this experimental investigation, the thermodynamic fundamental parameters of density (ρ) and speed of sound(U) were calibrated for aqueous solution/alcoholic (1-propanol and 2-propanol) solutions of piperidinium based ionic liquids of 1-butyl-1-methylpiperidinium tetrafluoroborate (BMPiBF4) in various concentrations within temperatures from 303.15 to 313.15 K. From these experimental determined values, various thermodynamic acoustic parameters of excess molar isentropic compressibility (KE s,m), excess molar volume (VE m) are expressed in specific and non-specific molecular interactions. Moreover, calibration of the partial molar volume′s and partial isentropic compressibility′s of both components shows strong interaction in BMPiBF4 + 2-proponol combination than any other executed binary composites. In addition to this, the FTIR characteristic spectrum of all combinations at different concentrations gives the more promising features such as interaction behaviour that helps our analysis to guide the interactions of individual bonds.

Interactions of Drug Doxycycline Hyclate with Galactitol in Aqueous Solutions at Different Temperatures by Volumetric and Acoustic Methods

2020 ◽  
Vol 234 (11-12) ◽  
pp. 1853-1874
Author(s):  
Shashi Kant Lomesh ◽  
Vikas Nathan ◽  
Madhu Bala ◽  
Inesh Kumar
Keyword(s):  
Molar Volume ◽  
Apparent Molar Volume ◽  
Isentropic Compressibility ◽  
Doxycycline Hyclate ◽  
Isentropic Compression ◽  
Acoustic Methods ◽  
Different Temperatures ◽  
Volume Of Transfer ◽  
Experimental Values ◽  
Molar Expansibility

AbstractThe experimental values of density, ρ and speed of sound, u of doxycycline hyclate drug (0.002–0.014) mol kg−1 in water and (0.1, 0.2 and 0.4) mol kg−1 of aqueous galactitol solutions at temperatures T = (303.15, 308.15 and 313.15) K and at atmospheric pressure have been reported in the present communication. From the experimental values, various derived parameters such as apparent molar volume (ΦV), apparent molar isentropic compression (ΦK), limiting apparent molar volume ($\phi_{\text{v}}^{\text{o}}$), limiting apparent molar isentropic compression ($\phi_{\text{K}}^{\text{o}}$), limiting apparent molar volume of transfer (Δ$\phi_{\text{V}}^{\text{O}}$), limiting apparent molar isentropic compression of transfer (Δ$\phi_{\text{K}}^{\text{O}}$), limiting apparent molar expansibility ($\phi_{\text{E}}^{\text{o}}$), thermal expansion coefficient (α) and acoustic parameters like isentropic compressibility $({{\kappa}_{\text{S}}})$, intermolecular free length (Lf), and specific acoustic impedance (Z) were calculated. The structure-making behaviour of DH in aqueous galactitol solution was determined on the basis of Hepler’s Equation i.e. on the basis of sign of ${\left({\frac{{{{\text{d}}^{2}}\phi_{\text{V}}^{\text{O}}}}{{{\text{d}}{{\text{T}}^{2}}}}}\right)_{\text{P}}}$. The various derived parameters were utilised to interpret the molecular interactions i.e. solute–solute and solute–solvent existing in the studied system.

scholarly journals Análisis experimental de la difusión salina durante la desalación por congelación

2019 ◽  
pp. 1-7
Author(s):  
Beatriz Castillo-Téllez ◽  
Margarita Castillo-Téllez ◽  
Erick César López-Vidaña ◽  
Gerardo Alberto Mejía-Pérez
Keyword(s):  
Aqueous Solution ◽  
Sodium Chloride ◽  
Salt Solution ◽  
Energy Demand ◽  
Lower Energy ◽  
Life Quality ◽  
Freezing Temperature ◽  
Water Desalination ◽  
Thermal Desalination ◽  
Different Temperatures

The consequences on health and low life quality caused by the problem of water scarcity, as well as the interrelation between energy and water supply, call attention to water desalination by Freezing Melting (F/M), which is a well-known technique but unfortunately, not used for this application, which is considered the most sustainable, in terms of its lower energy demand compared with commercial desalination techniques (about 70% less than thermal desalination). However, it presents some problems regarding the saline trapping in the ice, therefore, in this work, an experimental analysis is carried out to achieve a better understanding of the saline displacement, using an aqueous solution of sodium chloride, frozen at different temperatures, and configurations containers, with a F/M progressive desalination. It has been found that, at a freezing temperature of 8oC, it is possible to purify up to an average of 78.12% of the frozen salt solution, obtaining an easy-to-separate brine.

scholarly journals Study of Molecular Interaction in Aqueous KCl at Different Temperatures

2021 ◽  
Vol 13 (1) ◽  
pp. 1-8
Author(s):  
M. K. Praharaj
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Electrical Conductivity ◽  
Surface Tension ◽  
Molecular Interactions ◽  
Molecular Interaction ◽  
Solvation Number ◽  
Wada’S Constant ◽  
Rao’S Constant ◽  
Different Temperatures

Ultrasonic velocity, density, viscosity, and electrical conductivity have been measured for an aqueous solution of KCl at different concentrations and temperatures, the frequency is maintained at a constant value. Using the above experimental data, parameters such as Rao's constant, Wada's constant, solvation number, and surface tension were calculated and the molecular interactions between molecules of KCl and water at different temperatures was studied. Using Walden's plot, the ionicity of the solution was also studied.

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