References for 2

Wilhoit, R. C.; Marsh, Kenneth N.; Hong, Xin; Gadalla, N.; Frenkel, Michael

doi:10.1007/10520183_12

Cited by 5 publications

(8 citation statements)

References 791 publications

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“…Mass densities were those of the n-alkanes as tabulated in Landolt-Börnstein. 47 The calculated scattering length densities for the different n-alkyls are summarized in Temperature effects were proven to be negligible in the studied temperature range. Sample preparation.…”

Section: 45mentioning

confidence: 99%

Surfactant or block copolymer micelles? Structural properties of a series of well-defined n-alkyl–PEO micelles in water studied by SANS

et al. 2014

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aHere we present an extensive small-angle neutron scattering (SANS) structural characterization of micelles formed by poly(ethylene oxide)-mono-n-alkyl ethers (C n -PEOx) in dilute aqueous solution. Chemically, C n -PEOx can be considered as a hybrid between a low-molecular weight surfactant and an amphiphilic block copolymer. The present system, prepared through anionic polymerization techniques, is better defined than other commercially available polymers and allows a very precise and systematic testing of the theoretical predictions from thermodynamical models. The equilibrium micellar properties were elaborated by systematically varying the n-alkyl chain length (n) at constant PEO molecular weight or increasing the soluble block size (x), respectively. The structure was reminiscent of typical spherical starlike micelles i.e. a constant core density profile, $r 0 , and a diffuse corona density profile, $r À4/3. Through a careful quantitative analysis of the scattering data, it is found that the aggregation number, N agg initially rapidly decreases with increasing PEO length until it becomes independent at higher PEO molecular weight as expected for star-like micelles. On the other hand, the dependency on the n-alkyl length is significantly stronger than that expected from the theories for star-like block copolymer micelles, N agg $ n 2 similar to what is expected for surfactant micelles. Hence the observed aggregation behavior suggests that the C n -PEOx micelles exhibit a behavior that can be considered as a hybrid between low-molecular weight surfactant micelles and diblock copolymer micelles.

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Section: 45mentioning

confidence: 99%

Surfactant or block copolymer micelles? Structural properties of a series of well-defined n-alkyl–PEO micelles in water studied by SANS

et al. 2014

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“… a Average pressure for these measurements was 0.102 MPa. Standard uncertainty u is u ( T ) = 0.01 K for all measurements except surface tension where u ( T ) = 1 K, expanded uncertainties U are U ( p ) = 1 kPa, U (ρ) = 0.07 kg m –3 , U (η) = 0.01 mPa s, U ( c ) = 0.7 m s –1 , and U (γ) = 0.2 mN m –1 (level of confidence = 0.95, k = 2). b Reference best fits n -dodecane: ρ/kg m 3 = 1046.13 – [1.49513 × T /K] + [ 2.35839 × 10 –3 ( T /K) 2 ] – [2.43796 × 10 –6 ( T /K)] 3 ; n -hexadecane: ρ/kg m 3 = 956.848 – [0.557634 × T /K] + [2.68578 × 10 –4 ( T /K) 2 ] – [1.24436 × 10 –7 ( T /K) 3 ]. This value was interpolated from a plot of ln η versus 1/ T . c These data are from a correlation from NIST .…”

Section: Resultsmentioning

confidence: 99%

“… b Reference best fits n -dodecane: ρ/kg m 3 = 1046.13 – [1.49513 × T /K] + [ 2.35839 × 10 –3 ( T /K) 2 ] – [2.43796 × 10 –6 ( T /K)] 3 ; n -hexadecane: ρ/kg m 3 = 956.848 – [0.557634 × T /K] + [2.68578 × 10 –4 ( T /K) 2 ] – [1.24436 × 10 –7 ( T /K) 3 ]. This value was interpolated from a plot of ln η versus 1/ T . …”

Section: Resultsmentioning

confidence: 99%

Properties of Two-Component Mixtures of Isobutylcyclohexane (1) or tert-Butylcyclohexane (1) with n-Dodecane (2) or n-Hexadecane (2): Densities, Surface Tensions, Viscosities, and Speeds of Sound at 0.1 MPa and Various Temperatures

Prak

2021

J. Chem. Eng. Data

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This study provides data on measured densities, viscosities, speeds of sound, surface tensions, and calculated bulk moduli of two-component mixtures of a linear alkane (dodecane or hexadecane) with a branched cyclohexane (isobutyl- and t-butyl-cyclohexane). For most systems tested, the mixture properties changed monotonically from the pure alkane value to the cyclohexane isomer value as the mole fraction of the cyclohexane isomer increased. For some systems, a mixture had the lowest value for a particular property. This was found for the speed of sound of isobutylcyclohexane in n-dodecane, the kinematic viscosities of t-butylcyclohexane in n-dodecane, and the isentropic bulk modulus t-butylcyclohexane in n-hexadecane. Viscosity data were fitted using the correlations from McAllister, Jouyban–Acree, and Grunberg–Nissan. All three correlations fit the data within the experimental uncertainty of the measurements, and neither was clearly the best predictor for all mixture systems. The excess speeds of sound and molar Gibbs energies of activation for viscous flow were smaller than the propagated uncertainty of the calculated value. All viscosity deviations were negative, and the greatest deviation was −0.12 mPa s at 293.15 K. The excess molar volumes (V m E) were positive for all mixtures, and greater values were found in mixtures with the longer alkane and with t-butylcyclohexane. This suggests that the substituent on the cyclohexane that was bulkier did not pack as well as the less bulky “iso” group. The V m E values decreased as temperature increased for all mixtures. These mixture properties can be used by fuel chemists and engineers who are trying to create model mixture systems for fuels that contain linear, branched, cyclic, and aromatic compounds.

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“…Standard uncertainty u is u ( T ) = 0.01 K, expanded uncertainties U c are U c ( p ) = 1 kPa, U c (ρ) = 0.7 kg·m –3 for the alkanes; 2 kg·m –3 for n -nonylbenzene, and 4 kg·m –3 for 1,3,5-triisopropylbenzene due to lower purity level (level of confidence = 0.95, k = 2). Note the precision of the instrument is much higher than the error suggests. b Ref , best fits n -dodecane: ρ/kg·m 3 = 1046.13 – [1.49513 × T /K] +[ 2.35839 × 10 –3 ( T /K) 2 ] – [2.43796 × 10 –6 ( T /K)] 3 ; n -hexadecane: ρ/kg·m 3 = 956.848 – [0.557634 × T /K] + [2.68578 × 10 –4 ( T /K) 2 ] – [1.24436 × 10 –7 ( T /K) 3 ]. c Ref , 1,3,5-triisopropylbenzene: ρ/kg·m 3 = 1089.22 – [0.800 × T /K]. d Ref , ρ/kg·m 3 = 871.68 – [0.802 × T/C]. …”

Section: Resultsmentioning

confidence: 99%

“… b Ref , best fits n -dodecane: ρ/kg·m 3 = 1046.13 – [1.49513 × T /K] +[ 2.35839 × 10 –3 ( T /K) 2 ] – [2.43796 × 10 –6 ( T /K)] 3 ; n -hexadecane: ρ/kg·m 3 = 956.848 – [0.557634 × T /K] + [2.68578 × 10 –4 ( T /K) 2 ] – [1.24436 × 10 –7 ( T /K) 3 ]. …”

Section: Resultsmentioning

confidence: 99%

Thermophysical Properties of Two-Component Mixtures of n-Nonylbenzene or 1,3,5-Triisopropylbenzene with n-Hexadecane or n-Dodecane at 0.1 MPa: Experimentally Measured Densities, Viscosities, and Speeds of Sound and Molecular Packing Modeled Using Molecular Dynamics Simulations

Prak

Harrison

2021

J. Chem. Eng. Data

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This work presents experimentally measured densities, viscosities, and speeds of sound and calculated bulk moduli of binary mixtures of a C 15 H 25 aromatic compound (nnonylbenzene or 1,3,5-triisoproylbenzene) with either n-dodecane or n-hexadecane. Most properties increased monotonically as the amount of the compound with the higher property value increased. In contrast, minima in the speeds of sound for the 1,3,5triisopropylbenzene mixtures were found at x 1 = 0.1 or 0.2 in ndodecane mixtures and x 1 = 0.8 or 0.9 for n-hexadecane systems at 293.15 K. Also, the 1,3,5-triisopropylbenzene and n-hexadecane mixtures had viscosities below those of the individual compounds at 293.15 K. Excess molar volumes were all positive or close to zero; excess speeds of sound were all positive, while excess isentropic compressibilities and viscosity deviations were negative. Excess molar Gibbs energies of activation for viscous flow did not differ statistically from zero. Molecular dynamics simulations qualitatively reproduced the trends in excess molar volumes with 1,3,5-triisopropylbenzene mixtures having more positive excess molar volumes compared to the n-nonylbenzene mixtures. Examination of fluid structure using radial distribution functions and angular radial distribution functions showed that the relative positions and orientations of the aromatic rings in pure 1,3,5-triisopropylbenzene and n-nonylbenzene were very different. In addition, the arrangement of the n-nonylbenzene aromatic rings did not change as linear alkanes were added. In contrast, the addition of linear alkanes to 1,3,5-triisopropylbenzene altered the packing of the aromatic rings. This disruption of the preferential arrangement of 1,3,5-triisopropylbenzene aromatic rings in mixtures with linear alkanes is likely the reason these systems have larger excess molar volumes than the n-nonylbenzene mixtures.

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References for 2

Cited by 5 publications

References 791 publications

Surfactant or block copolymer micelles? Structural properties of a series of well-defined n-alkyl–PEO micelles in water studied by SANS

Surfactant or block copolymer micelles? Structural properties of a series of well-defined n-alkyl–PEO micelles in water studied by SANS

Properties of Two-Component Mixtures of Isobutylcyclohexane (1) or tert-Butylcyclohexane (1) with n-Dodecane (2) or n-Hexadecane (2): Densities, Surface Tensions, Viscosities, and Speeds of Sound at 0.1 MPa and Various Temperatures

Thermophysical Properties of Two-Component Mixtures of n-Nonylbenzene or 1,3,5-Triisopropylbenzene with n-Hexadecane or n-Dodecane at 0.1 MPa: Experimentally Measured Densities, Viscosities, and Speeds of Sound and Molecular Packing Modeled Using Molecular Dynamics Simulations

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