Modification of glycerol force Field for simulating silver nucleation under a diffusion limited condition. This page was last edited on 12 November 2020, at 12:42 (UTC). [ Links ], 13. Soc., 90, 61 (2002). O. Redlich, A.T. Kister, Algebraic representation of thermodynamic properties and the classification of solutions, Ind. [ Links ], 19. [ Links ], 28. For this reason, the volume thermal expansion coefficients (α) were calculated by means of Eq. Results for salinities I, III and V as a function of glycerol concentration and temperature are graphically displayed in Fig. (Tokyo), 58, 219 (2010). On the other hand, the excess volumes calculated from Eq. Peralta, R. Infante, G. Cortez, R.R. 7 was calculated (27): Table 6 and Figure 9 show (θH 0-Exc /θp) values at 298.15 K. It follows that this property is negative in all compositions, indicating an increase in the excess molar enthalpy as the pressure is increased. See details above. This behavior is shown graphically in Figure 1 at all temperatures. R.T. Fort, W.R. Moore, Viscosities of binary liquid mixtures, Trans. On the other hand, in pharmaceutical and chemical pre-formulation studies, it is very important to predict the variation of physicochemical properties related to pharmaceutical dosage forms, with respect to temperature changes; especially those properties which affect the concentration of active ingredients in the formulations developed. The methodology to fin d the J i terms was described in previous works (15, 30). We perform molecular dynamics simulations of glycerol (propane-1,2,3-triol) at normal pressure and a wide range of temperatures (300–460 K) and study the sensitivity of simulation results to the force field (FF) considered. 3 Drug Applied Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran. [ Links ], 16. 101-103. Pharm. International Journal of Heat and Mass Transfer. Chem. It is important to note that there are some other reports in the literature about density values of this binary system (17-20), but the more comprehensive and systematic is the one studied here. We will call 0.003785411784 the volume conversion factor - vcf, volume in cubic meters = volume in gallons × vcf or vm³ = vgal × vcf (2), Now, dividing the equation (1) by the equation (2), we get, mkgvm³ = mlbvgal × mcfvcf, but mkgvm³ is, by definition, the density (d) in kg/m³, so.,,,,,,,, Solution Chem., 33, 169 (2004). Chem. Glycerol and water are used to preserve certain types of plant leaves. Bull. Quím. Variation of excess molar enthalpy with pressure. Barel, M. Paye, H.I. These metrics are regularly updated to reflect usage leading up to the last few days. density of water. Rev., 71, 5 (1971). Please note: If you switch to a different device, you may be asked to login again with only your ACS ID. 1,2-Propanediol and ethanol are the cosolvents most used in design nowadays, especially those intended for elaboration of peroral and parenteral medications (3). Please reconnect. The Redlich-Kister parameters for glycerol + water mixtures at all temperatures studied are presented in Table 5 in addition to determination coefficient s and standard deviations calculated according to Eq. Table 2 summarizes the molar volumes (V 0 ) for the binary mixtures at all temperatures. Farm., 34, 46 (2005). 3. J. Jiménez, J. Manrique, F. Martínez, Effect of temperature on some volumetric properties for ethanol + water mixtures, Rev. We also discuss the statistics of inter- and intramolecular hydrogen bonds (HBs). Instead, in the cases of OPLS1 and OPLS2-FFs, D(T) is underestimated by approximately 2 orders of magnitude. As a sugar substitute, it has approximately 27 kilocalories per teaspoon (sugar has 20) and is 60% as sweet as sucrose. Besides, better correlation was found with solubility parameter. In comparison with experiments, FFs i and iii provide reasonable estimations of ρ(T) with deviations of ≤4.5%; for FF ii, deviations in density are more pronounced, ≤9%. All information in this site is provided “as is”, with no guarantee of completeness, accuracy, timeliness or of the results obtained from the use of this information. To convert a quantity of a substance or material expressed as a volume to mass we simply use the formula: We want to calculate the mass in grams from a volume in milliliters. Sh. The model fits very well to the experimental data. system. 30 No. Pharm., 269, 353 (2004). DOW Chemical Company, Density of Glycerin-Water Solutions, Table, accessed on April, 2011.URL:        [ Links ], 17. Así mismo se calcularon los coeficientes térmicos de expansión volumétrica encontrado valores desde 2,51 x 10 -4 K -1 para el agua pura hasta 4,38 x 10 -4 K -1 para el glicerol puro a 298,15 K. Finalmente se usó el modelo Jouyban-Acree para correlacionar la densidad y el volumen molar de las diferentes mezclas encontrando desviaciones medias relativas de 0,19 ± 0,11 % y 0,32 ± 0,25 % para densidades y volúmenes molares respectivamente. We perform molecular dynamics simulations of glycerol (propane-1,2,3-triol) at normal pressure and a wide range of temperatures (300–460 K) and study the sensitivity of simulation results to the force field (FF) considered. 1. Nevertheless, the observed deviations are lower than those observed earlier for aqueous mixtures containing ethanol and 1,2-propanediol as cosolvents. Densities, and therefore specific gravities, vary with temperature; hence it is necessary to indicate the temperatures of both the glycol and water.

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