“…The densities of aqueous PEG 2000 solutions could be correlated by using the following equation where ρ is the density of the solution, ρ 0 is the density of pure water at the corresponding temperature, and w p is the mass fraction of PEG 2000.The average relative deviation is less than 1%. Very close agreement was found between the densities measured in the present work and those reported by Teng et al and Kirincic et al, which are shown in Figure . 1 Relationship between the densities and mass fraction, w p , for PEG 2000 + water: ◆, 298.15 K; ▪, 303.15 K; ▴, 308.15 K; −, 313.15 K; ○, 318.15 K. 2 Comparison of present experimental data with literature data on density: ○, experimental; ▪, Stanislava Kirincic and Cveto Klofutar; ▵, Sheau Ping Teng and Tjoon Tow Teng.…”
Densities and viscosities of aqueous solutions of poly(ethylene glycol) 2000 (mass fraction from (5 to 50) %) have been measured at 298.15, 303.15, 308.15, 313.15, and 318.15 K. The density data show a linear variation with mass fraction of the polymer for all temperatures. The viscosity data of PEG 2000 solutions were correlated as a function of mass fraction, using a nonlinear equation, for the five different temperatures covered in the present work. Densities and viscosities of poly(ethylene glycol)-sodium citrate two-phase systems have been measured and are correlated with composition. The tie line lengths (TLL) of the aqueous two-phase systems have also been estimated.
“…The densities of aqueous PEG 2000 solutions could be correlated by using the following equation where ρ is the density of the solution, ρ 0 is the density of pure water at the corresponding temperature, and w p is the mass fraction of PEG 2000.The average relative deviation is less than 1%. Very close agreement was found between the densities measured in the present work and those reported by Teng et al and Kirincic et al, which are shown in Figure . 1 Relationship between the densities and mass fraction, w p , for PEG 2000 + water: ◆, 298.15 K; ▪, 303.15 K; ▴, 308.15 K; −, 313.15 K; ○, 318.15 K. 2 Comparison of present experimental data with literature data on density: ○, experimental; ▪, Stanislava Kirincic and Cveto Klofutar; ▵, Sheau Ping Teng and Tjoon Tow Teng.…”
Densities and viscosities of aqueous solutions of poly(ethylene glycol) 2000 (mass fraction from (5 to 50) %) have been measured at 298.15, 303.15, 308.15, 313.15, and 318.15 K. The density data show a linear variation with mass fraction of the polymer for all temperatures. The viscosity data of PEG 2000 solutions were correlated as a function of mass fraction, using a nonlinear equation, for the five different temperatures covered in the present work. Densities and viscosities of poly(ethylene glycol)-sodium citrate two-phase systems have been measured and are correlated with composition. The tie line lengths (TLL) of the aqueous two-phase systems have also been estimated.
“…The small-signal sound speed in liquid is described by c s0 = ( B s /ρ 0 ) 1/2 , where B s is the adiabatic bulk modulus (the reciprocal of compressibility) and ρ 0 the density; the viscosity does not enter, at least in the small-signal regime. Since the change in the density is minor in aqueous PEG solutions of our concentration range, typically being less than 3% (i.e., 1% in the difference in ρ 0 −1/2 ), the major origin of the sound dispersion can be ascribed to the change in the modulus. In fact, a simple two-component estimation of the modulus of a low-MW (1000) PEG solution, which is based on the linear combination of the compressibilities of water and PEG, leads to a 9% change in B s 1/2 at c (PEG) = 200 g/L; it reasonably agrees with the experimental sound dispersion in the literature (7.8%) .…”
Single-walled carbon nanotubes (SWCNTs) greatly enhance photoacoustic effects in aqueous solution of poly(ethylene glycol) via strong near-infrared sensitization and cavity formation. The observed acoustic attenuation and sound speed dispersion reveal polymer entanglement and laser-generated cavitation. Bubble resonance accelerates the sound wave and induces strong nonlinearity. As a versatile nanometer-sized in situ photoacoustic emitter and bubble generator, SWCNTs may find applications in microscopically controlled photoacoustic imaging and low-amplitude shock wave therapy.
“…They also attempted to estimate the hydration numbers of these PEGs by applying Shiio's method [19] and observed that PEG-4000 is hydrated most. Teng and Teng [20] measured the densities of aqueous solutions of PEG-2000 and its aqueous mixtures with electrolytes and nonelectrolytes at different temperatures. The data up to 0.5 molal were fitted to a density-molality polynomial.…”
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