scholarly journals Measurement and prediction of physical properties of aqueous sodium salt of L-phenylalanine

2017 ◽  
Vol 82 (7-8) ◽  
pp. 905-919 ◽  
Author(s):  
Sahil Garg ◽  
Mohd Shariff ◽  
Muhammad Shaikh ◽  
Bhajan Lal ◽  
Asma Aftab ◽  
...  
Keyword(s):  
Refractive Index ◽  
Thermal Expansion ◽  
Physical Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Sodium Salt ◽  
Viscosity Data ◽  
Aqueous Sodium ◽  
Mass Fractions ◽  
Increasing Temperature

Physical properties, such as density, refractive index and viscosity, of an aqueous sodium salt of (S)-2-amino-3-phenylpropionic acid (L-phenylalanine, Na-Phe) were investigated in this work. These properties were measured over a temperature range of 298.15?343.15 K at atmospheric pressure. The mass fractions (w) of Na-Phe were 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35 and 0.40. The analysis of the experimental data showed that the values of density, refractive index and viscosity decreased with increasing temperature at any constant concentration of Na-Phe. However, these values increased with increasing concentration at any constant temperature. The density values were used to estimate the thermal expansion coefficient. The thermal expansion coefficient increased slightly with increasing temperature and concentration. The density and refractive index data were correlated using a modified Graber equation, while, the viscosity data were correlated using a modified Vogel?Tamman?Fulcher (VTF) equation. In all the cases, quantitative analyses of the influence of temperature and concentration were performed.

Physical Properties of Plastics for Photothermoelastic Investigations

1958 ◽  
Vol 25 (4) ◽  
pp. 525-528
Author(s):  
H. Tramposch ◽  
G. Gerard
Keyword(s):  
Thermal Expansion ◽  
Thermal Properties ◽  
Heat Conduction ◽  
Physical Properties ◽  
Epoxy Resin ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Modulus Of Elasticity ◽  
Figures Of Merit ◽  
Optical Sensitivity

Abstract The optical and physical properties of Paraplex P43, Castolite, and epoxy resin Hysol 6000-OP, which are potentially of interest in photothermoelastic investigations, were investigated over a temperature range from +100 to −60 F. Results on the thermal-expansion coefficient, the material fringe value, and the modulus of elasticity as functions of temperature are presented. Also evaluated were thermal properties of importance in heat conduction. Photothermoelastic figures of merit, which rate the optical sensitivity of materials in photothermoelastic applications, as well as a new method to determine this figure in a relative manner are presented.

scholarly journals Volumetric Properties of Aqueous Solutions of Ethylene Glycols in the Temperature Range of 293.15–318.15 K

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Omer El-Amin Ahmed Adam ◽  
Ammar Hani Al-Dujaili ◽  
Akl M. Awwad
Keyword(s):  
Thermal Expansion ◽  
Aqueous Solutions ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Infinite Dilution ◽  
Partial Molar Volumes ◽  
Volumetric Properties ◽  
Molar Volumes ◽  
Ethylene Glycols ◽  
Increasing Temperature

Densities of aqueous solutions of Ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) were measured at temperatures from 293.15 to 318.15 K and molalities ranging from 0.0488 to 0.5288 mol·kg−1. Volumes of all investigated solutions at a definite temperature were linearly dependent on the solute molality; from this dependence the partial molar volumes at infinite dilution were determined for all solutes. It was found that the partial molar volumes at infinite dilution V-2,0 were concentration independent and slightly increase with increasing temperature. The partial molar volumes at infinite dilution V-2,0 or the limiting apparent molar volumes of ethylene glycols were fitted to a linear equation with the number of oxyethylene groups (n) in the solute molecule. From this equation a constant contribution of the terminal (OH) and the (CH2CH2O) groups to the volumetric properties was obtained. The thermal expansion coefficient (α1,2) for all investigated solutions was calculated at temperatures from 293.15 to 318.15 K. The thermal expansion coefficients for all solutes increase with increasing temperature and molality. Values of (α1,2) were higher than the value of the thermal expansion coefficient of the pure water.

Eco-Glass Based on Thailand Quartz Sands and Bismuth Oxide

2011 ◽  
Vol 695 ◽  
pp. 223-226 ◽  
Author(s):  
Krit Won-In ◽  
Sorapong Pongkrapan ◽  
Pisutti Dararutana
Keyword(s):  
Refractive Index ◽  
Thermal Expansion ◽  
Specific Gravity ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Bismuth Oxide ◽  
Environmentally Friendly ◽  
Quartz Sands

Ecological glass with non-toxic was fabricated in bismuth-bearing glass using mainly local quartz sands and various concentration of bismuth oxide. The specific gravity (SG), refractive index (RI), thermal expansion coefficient (CoE) and hardness (HV) were determined. It was found that the values of SG, RI and HV were increased linearly as the increasing of bismuth oxide, whiles that of CoE was decreased. This glass is environmentally friendly materials.

Effect of Zirconia on the Physical Properties of Cordierite Honeycomb Filter

2007 ◽  
Vol 544-545 ◽  
pp. 725-728
Author(s):  
Sung Jin Kim ◽  
Hee Gon Bang ◽  
Jung Wook Moon ◽  
Sang Yeup Park
Keyword(s):  
Thermal Expansion ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Porous Body ◽  
Extrusion Process ◽  
Air Purification ◽  
Pore Former ◽  
Cordierite Honeycomb

The enhancement of physical properties of porous honeycomb filter for air purification was investigated using cordierite with the addition of pore former and zirconia additive. Because cordierite honeycomb has porous body, binder formulation was varied using graphite for a pore forming agent as well as lubricating agent during the extrusion process. Also, the effect of zirconia additives on the resultant physical properties of honeycomb filter such as porosity, thermal expansion coefficient and mechanical strength was investigated.

Preparation and Physical Properties of SrxLa1-xMgAl11O19-0.5x

2010 ◽  
Vol 105-106 ◽  
pp. 403-405
Author(s):  
Hua Dong Yao ◽  
Qiang Xu ◽  
Ling Liu ◽  
Shi Zhen Zhu
Keyword(s):  
Fracture Toughness ◽  
Thermal Expansion ◽  
Physical Properties ◽  
Relative Density ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Hot Pressing ◽  
Oxygen Vacancies ◽  
Effect Of Doping

In order to further improve the thermal expansion coefficient of LaMgAl11O19, LaMgAl11O19 with Sr2+ doped is designed to increase the density of oxygen vacancies, and the effect of doping Sr2+ to hardness and toughness was studied. SrxLa1-xMgAl11O19-0.5x pellets were synthesized by hot-pressing (1500°C, 40MPa). The relative density of LaMgAl11O19 reaches 97.68%. The hardness of LaMgAl11O19 is about 25.47GPa and the fracture toughness is 11.3 MPa•m1/2. The thermal expansion coefficient of LaMgAl11O19 was 8.71×10-6K-1, and Sr0.6La0.4MgAl11O18.7 was 8.95×10-6K-1. The results showed hot-pressure sintering could synthesize dense SrxLa1-xMgAl11O19-0.5x with magnetoplumbite structure. Sr2+ doping could increase the thermal expansion coefficient of LaMgAl11O19.

The Effect of CaO and MgO on Physical Properties of MgO-CaO-B2O3-Al2O3-SiO2 Glasses with Composition Close to the E-Glass Fibers

2008 ◽  
Vol 39-40 ◽  
pp. 81-84 ◽  
Author(s):  
J. Kraxner ◽  
R. Klement ◽  
Mária Chromčíková ◽  
Marek Liška
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Physical Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Glass Fibers ◽  
Flow Activation Energy ◽  
Flow Activation

High temperature viscosity and density of glass melts, glass transition temperature, and thermal expansion coefficient of glasses from the system MgO-CaO-B2O3-Al2O3-SiO2 with composition close to the E-glass were measured and interpreted with respect to the effect of CaO and MgO content on their physical properties. The Andrade model was applied for description of the temperature dependence of the glass viscosity within studied temperature range. The regression formaulae describing the compositional dependence of the viscosity points T2 = T( η = 100 dPa.s), T3 = T( η = 1000 dPa.s), the glass transition temperature, Tg, thermal expansion coefficient of glass, αg , and of the viscous flow activation energy, Ea, were proposed.

Thermal Expansion Measurements and Transition Temperatures, First and Second Order

1959 ◽  
Vol 32 (4) ◽  
pp. 1005-1015
Author(s):  
Mark L. Dannis
Keyword(s):  
Thermal Expansion ◽  
Transition Temperature ◽  
Physical Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Second Order ◽  
Rate Of Change ◽  
Order Transition ◽  
Abrupt Changes ◽  
Second Order Transition

Abstract When any pure material goes through a change in state, its physical properties change greatly. In each phase the physical properties are relatively constant or change slowly enough with temperature that the rate of change of a property such as volume is a constant. This rate of change of volume is the thermal expansion coefficient, (∂V/V)/∂T. The thermal expansion coefficient is almost constant, experimentally, as long as the temperature range over which measurements are made does not include a phase transition. At the transition temperature, abrupt changes in volume are found as illustrated in Figure 1. Polymeric materials often show changes in physical properties not necessarily accompanied by abrupt changes in volume, even though the expansion coefficient does change. Since the expansion coefficient changes, some change in internal structure is suspected, and the name second-order transition (Tg) has been adopted. This kind of change is roughly diagrammed in Figure 2. This latter change at the second-order transition temperature can be found in every known polymer, even though many polymers possess clear, first-order, crystalline transitions as well. Hevea rubber, for example, has a crystalline melting point of 28° C, compared to its Tg about −70°. These data are shown, copied from Boyer and Spencer, as Figure 3.

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