Composition, Density, Viscosity, Electrical Conductivity, and Refractive Index of Saturated Solutions of Lithium Formate + Water + Ethanol

1996 ◽  
Vol 41 (1) ◽  
pp. 74-78 ◽  
Author(s):  
Angel Cartón ◽  
Francisco Sobrón ◽  
Marta de la Fuente ◽  
Elena de Blas
Keyword(s):  
Electrical Conductivity ◽  
Refractive Index ◽  
Lithium Formate ◽  
Saturated Solutions

Solubility, Density, Viscosity, Electrical Conductivity, and Refractive Index of Saturated Solutions of Lithium Hydroxide in Water + Ethanol

2005 ◽  
Vol 50 (1) ◽  
pp. 187-190 ◽  
Author(s):  
Maria Elisa Taboada ◽  
Daniza M. Véliz ◽  
Héctor R. Galleguillos ◽  
Teófilo A. Graber
Keyword(s):  
Electrical Conductivity ◽  
Refractive Index ◽  
Lithium Hydroxide ◽  
Saturated Solutions

scholarly journals Quality Assessment of Raw Honey Issued from Eastern Romania

Agriculture ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 247
Author(s):  
Aida Albu ◽  
Cristina-Gabriela Radu-Rusu ◽  
Ioan Mircea Pop ◽  
Gabriela Frunza ◽  
Gherasim Nacu
Keyword(s):  
Electrical Conductivity ◽  
Refractive Index ◽  
Storage Conditions ◽  
Quality Parameters ◽  
Climatic Conditions ◽  
Ash Content ◽  
Botanical Origin ◽  
Free Acidity ◽  
Qualitative Level ◽  
Raw Honey

Romania is known among the main European honey producers, due to the variety of landforms as well as the diversity of the flora. Thirty-four honey samples of the acacia, linden and multifloral types, produced in eastern Romania and collected during 2013–2018, were physico-chemically analyzed using methods provided by the national and EU standards. The results of water-insoluble solids, color and refractive index were found to be 0.023–0.131%, 0.3–76.4 mm Pfund and 1.485–1.499, respectively. The moisture content ranged between 15.20% and 20.77%, solid substances content ranged between 79.23% and 84.80% and total soluble substances content ranged between 77.83 °Brix and 83.26 °Brix. The obtained values of specific gravity were from 1.414 to 1.450 g/cm3, pH ranged from 3.673 to 5.503 and free acidity ranged between 2.4 meq and 50 meq kg−1. The ash content and the electrical conductivity varied between 0.030 and 0.543% and 130 and 679 µS cm−1, respectively. Pearsonʹs correlation analysis showed an intense association of the ash content with electrical conductivity (r = 0.81). Our findings reveal the qualitative level of Romanian honey and the variation in quality parameters due to factors such as geographical region, climatic conditions, botanical origin and handling or storage conditions.

scholarly journals Studies on Surface Morphology and Electrical Conductivity of PS Thin Films in Presence of Divalent Complexes

2019 ◽  
Vol 16 (3) ◽  
pp. 0588 ◽  
Author(s):  
Al-Taa'y Et al.
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Refractive Index ◽  
Surface Morphology ◽  
Structural Modification ◽  
Energy Gap ◽  
Three Dimensional ◽  
Optical Parameters ◽  
Optical Energy Gap ◽  
Energy Gaps

       Optical properties and surface morphology of pure and doped Polystyrene films with different divalent metals of Zn, Cu and Sn and one concentration percentage have been studied. Measurements of UV-Vis spectrophotometer and AFM spectroscopy were determined. The absorbance, transmittance and reflectance spectrums were used to study different optical parameters such as absorption coefficient, refractive index, extinction coefficient and energy gap in the wavelengths rang 200-800nm. These parameters have increased in the presence of the metals. The change in the calculated values of energy gaps with doping metals content has been investigated in terms of PS matrix structural modification. The value of optical energy gap was found decreasing from 4.5eV of pure PS to reach 4.45, 4.38 and 4.32eV for Zn, Cu and Sn respectively. Measurement by AFM spectroscopy was done for two and three dimensional topographic images. From figures, the data of roughness average were 7.29, 7.31, 3.37 and 6.73nm for samples (Blank, Zn, Cu and Sn) respectively.

Properties of KSCN-rich Molten NaSCN-KSCN Mixtures

1991 ◽  
Vol 46 (6) ◽  
pp. 540-544
Author(s):  
Yasuhiko Iwadata ◽  
Junichi Mochinaga ◽  
Kazuo Igarashi ◽  
Koji Tajiri ◽  
Tadashi Asahina ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Surface Tension ◽  
Heat Capacity ◽  
Refractive Index ◽  
Molar Volume ◽  
Molten State

AbstractFor molten (Na, K)SCN mixtures with more than 50 mol% KSCN the molar volume Vm,electrical conductivity, χ, refractive index n, surface tension γ and heat capacity CP were measured in dependence of composition and temperature, γ exhibited the minimum at ca. 70 mol% KSCN and Cp was 148 JK-1 mol-1 in the range of 413 to 471 K. The electronic polarizabilities of the ions in the molten state were estimated by the semiclassical Clausius-Mossotti equation

scholarly journals Density, Refractive Index, Apparent Specific Volume, and Electrical Conductivity of Aqueous Solutions of Poly(ethylene glycol) 1500 at Different Temperatures

2014 ◽  
Vol 59 (2) ◽  
pp. 339-345 ◽  
Author(s):  
Bernardo de Sá Costa ◽  
Edwin Elard Garcia-Rojas ◽  
Jane Sélia dos Reis Coimbra ◽  
José Antônio Teixeira ◽  
Javier Telis-Romero
Keyword(s):  
Electrical Conductivity ◽  
Refractive Index ◽  
Ethylene Glycol ◽  
Aqueous Solutions ◽  
Specific Volume ◽  
Poly Ethylene Glycol ◽  
Different Temperatures ◽  
Poly Ethylene

scholarly journals The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component

2020 ◽  
Vol 85 (10) ◽  
pp. 1303-1315
Author(s):  
Biljana Djordjevic ◽  
Dragan Troter ◽  
Vlada Veljkovic ◽  
Mirjana Kijevcanin ◽  
Ivona Radovic ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Refractive Index ◽  
Choline Chloride ◽  
Lattice Energy ◽  
Deep Eutectic Solvents ◽  
Industrial Processes ◽  
Molecular Volume ◽  
Scanning Calorimetry ◽  
Linear Behaviour ◽  
The Fourier Transform

Different deep eutectic solvents (DESs) of triethanolamine (TEOA) and oxalic acid (OA), glacial acetic acid (AA), L-(+)-lactic acid (LA), oleic acid (OLA), glycerol (G), ethylene glycol (EG), propylene glycol (PEG), choline chloride (ChCl) or 1,3-dimethylurea (DMU) were prepared and characterized regarding their physicochemical (density, viscosity, electrical conductivity, refractive index, coefficient of volume expansion, molecular volume, lattice energy and heat capacity) properties over the temperature range of 293.15?363.15 K at 101.325 kPa. For all tested DESs, the density, viscosity and refractive index decreased with rising temperature, while the electrical conductivity increased. The temperature dependence of viscosity and electrical conductivity are described by the Vogel?Tamman?Fulcher equations. The viscosity and molar conductivity, which exhibited a linear behaviour, were correlated by the fractional Walden rule. Besides, the Fourier transform infrared spectroscopy (FTIR) was used to study the functional groups of these DESs while thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) provided the information about their stability. The tested DESs of TEOA possess desirable properties for use in various industrial processes, such as extractions, separations, chemical technology and biotechnology.

scholarly journals Comparative Analysis of the Physicochemical Parameters of Breast Milk, Starter Infant Formulas and Commercial Cow Milks in Serbia

2016 ◽  
Vol 33 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Slavica Sunarić ◽  
Tatjana Jovanović ◽  
Ana Spasić ◽  
Marko Denić ◽  
Gordana Kocić
Keyword(s):  
Electrical Conductivity ◽  
Surface Tension ◽  
Refractive Index ◽  
Breast Milk ◽  
Human Milk ◽  
Physicochemical Parameters ◽  
Titratable Acidity ◽  
Cow Milk ◽  
Physical Parameters ◽  
Infant Formulas

Summary Data on the physical properties of cow milk and infant formulas are important since they indicate the differences in physicochemical and rheological characteristics and compatibility with natural breast milk. This fact is important not only for quality control but also for the use of these commercial products as infant diet supplements or as complete breast milk substitutes. This study was undertaken to determine refractive index, surface tension, pH, electrical conductivity, viscosity and titratable acidity of the UHT cow milk, starter infant formulas and breast milk of Serbian mothers in order to compare commercial milk formulations with natural human milk. The paper also presents the measured data of some physical parameters of human milk about which there is little information in the literature. It has been also demonstrated how these parameters were changed by freezing and prolonged storage of breast milk. In this study, 8 commercial cow milks, 6 starter infant formulas and 15 different samples of colostrum, transition and mature breast milk were included. The titratable acidity, pH, electrical conductivity, refractive index, viscosity and surface tension were measured by using standardized techniques. It has been found that infant formulas available on the Serbian market differ in physicochemical parameters compared to breast milk. Regarding these parameters, none of the analyzed formulas fully corresponded to breast milk. It has been also shown that measurement of physical parameters is simple and inexpensive way to monitor the milk shelf-life which is important for human milk banks.

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