Small range 文档类型:"3"

Totally found 9 items.

  • [期刊] Experimental and predicted viscosities of binary mixtures of cyclic ethers with 1-chloropentane or 1-chlorohexane at 283.15, 298.15, and 313.15 K
    Viscosities for the binary mixtures of tetrahydrofuran. tetrahydropyran, 1,3-dioxolane or 1,4-dioxane with 1-chloropentane or 1-chlorohexane have been determined at 283.15, 298.15 and 313.15 K, except for the Mixtures containing 1,4-dioxane whose measurements were carried out only at 298.15 and 313.15 K. Kinematic viscosities have been correlated by the McAllister equation. Viscosity deviations have been calculated from viscosity data for all the mixtures and results have been fitted with the Redlich-Kister equation. Experimental values of kinematic viscosity have been compared to values predicted by means of the Asfour method.
  • [期刊] Thermochemistry and Kinetics of the Thermal Decomposition of 1-Chlorohexane
    A theoretical kinetic study of the thermal decomposition of 1-chlorohexane in gas phase between 600 and 1000 K was performed. Transition-state theory and unimolecular reaction rate theory were combined with molecular information provided by quantum chemical calculations. Particularly, the B3LYP, BMK, M05-2X, and M06-2X formulations of the density functional theory (DFT) and the high-level ab initio methods G3B3 and G4 were employed. The possible reaction channels for the thermal decomposition of 1-chlorohexane were investigated, and the reaction takes place through the elimination of HCl with the formation of 1-hexene. The derived high-pressure limit rate coefficients are k(infinity) (600-1000 K) = (8 +/- 5) x 10(13) exp[-((56.7 +/- 0.4) kcal mol(-1)/RT)] s(-1). The pressure effect over the reaction was analyzed from the calculation of the low-pressure limit rate coefficients and the falloff curves. In addition, the standard enthalpies of formation at 298 K of -46.9 +/- 1.5 kcal mol(-1) for 1-chlorohexane and 5.8 +/- 1.5 kcal mol(-1) for C6H13 radical were derived from isodesmic and isogiric reactions at high levels of theory. (C) 2017 Wiley Periodicals, Inc.
  • [期刊] Excess molar volumes of (an alkane + 1-chloroalkane) at T = 298.15 K
    The densities of the following: (pentane + I-chloropropane, or I-chlorobutane, or 1-chloropentane, or 1-chlorohexane ), (hexane + 1-chloropropane, or 1-chlorobutane, or 1-chloropentane, or 1-chlorohexane ), (heptane + 1-chloropropane, or 1-chlorobutane, or 1-chloropentane, or I-chlorohexane ), (octane + 1-chloropropane, or 1-chlorobutane, or 1-chloropentane, or 1-chlorohexane), were measured at T = 298.15 K by means of a vibrating-tube densimeter. The excess molar volumes V!:;, calculated from the density data, are negative for (pentane + l-chloropentane, or 1-chlorohexane) and (hexane + 1-chlorohexane) over the entire range of composition. (Pentane + I-chlorobutane), (hexane +l-chloropentane) and (heptane + 1-chlorohexane) exhibit an S-shaped V!:; dependence. For all the other systems, V!:; is positive. The V results. were correlated using the fourth-order Redlich-Kister equation, with the maximum likelihood principle being applied for detennining the adjustable parameters.
  • [期刊] Densities, speeds of sound, isentropic compressibilities, and refractive indices of binary mixtures of methyl methacrylate with hydrocarbons, haloalkanes and alkyl amines
    Isentropic compressibilities K-S, and thermal expansion coefficients alpha for methyl methacrylate, 1,2-dichloroethane (DCE), 1,1,2,2-tetrachloroethane (TCE), 1-chlorohexane, and 1-bromohexane in the temperature range 298.15-333.15 K and isentropic compressibilities K-S(E), excess molar volumes V-E for 14 binary mixtures of methyl methacrylate (MMA) with hexane, cyclohexane, benzene, toluene, chlorobenzene, tetrachloromethane, trichloromethane, 1,2-dichloroethane, 1,1,2,2-tetrachloroethane, 1-chlorohexane, 1-bromohexane, n-propylamine, n-butylamine, and tri-n-butylamine over the entire range of composition at 303.15 K, derived from experimental densities rho and speeds of sound u have been reported. The values of K-S(E) and V-E for 14 binary mixtures indicate varying extent of molecular interactions and interstitial accommodation between unlike components. The experimental speeds of sound have been analyzed in terms of collision factor theory (CFT) and free length theory (FLT). (C) 2003 Elsevier Science B.V. All rights reserved. [References: 51]
  • [期刊] N-halamine/pyridinium-derivatized magnetic sub-microparticles with synergetic biocidal properties
    Dual biocidal groups of N-halamine and pyridinium were used to modify surface of magnetic sub-microparticles to exert enhanced synergistic antibacterial capacity. Magnetic silica Fe3O4 sub-microparticles (SMPs) were synthesized and then encapsulated with interpenetrating polymer network (IPN) of polystyrene (PS) and poly (acrylic acid) (PAA). The carboxylic acid groups of PAA were used as surface reactive sites to bond with amino groups of 4-aminopyridine through amidation reaction. N-halamine/pyridinium-derivatized magnetic sub-microparticles were sequentially produced by quaternization of the pyridine to pyridinium with 1-chlorohexane and chlorination of amide N-H to N-halamine with NaClO. The synthetic steps and products were characterized with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectrocsopy (XPS). The N-halamine/pyridinium-derivatized SMPs with dual biocidal functionalities showed faster deactivation abilities against both Escherichia coll. and Staphylococcus aureus compared with their counterparts that contained only N-halamine or pyridinium, and exhibited promising stability toward repeated washing and long-term storage. The designed SMPs in this study offer potential and ideal candidates for sterilization application due to multiple advantages including improved synergistic biocidal ability, high surface area, and easy recyclability.
  • [期刊] N-halamine/pyridinium-derivatized magnetic sub-microparticles with synergetic biocidal properties
    Dual biocidal groups of N-halamine and pyridinium were used to modify surface of magnetic sub-microparticles to exert enhanced synergistic antibacterial capacity. Magnetic silica Fe3O4 sub-microparticles (SMPs) were synthesized and then encapsulated with interpenetrating polymer network (IPN) of polystyrene (PS) and poly (acrylic acid) (PAA). The carboxylic acid groups of PAA were used as surface reactive sites to bond with amino groups of 4-aminopyridine through amidation reaction. N-halamine/pyridinium-derivatized magnetic sub-microparticles were sequentially produced by quaternization of the pyridine to pyridinium with 1-chlorohexane and chlorination of amide N-H to N-halamine with NaClO. The synthetic steps and products were characterized with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectrocsopy (XPS). The N-halamine/pyridinium-derivatized SMPs with dual biocidal functionalities showed faster deactivation abilities against both Escherichia coll. and Staphylococcus aureus compared with their counterparts that contained only N-halamine or pyridinium, and exhibited promising stability toward repeated washing and long-term storage. The designed SMPs in this study offer potential and ideal candidates for sterilization application due to multiple advantages including improved synergistic biocidal ability, high surface area, and easy recyclability.
  • [期刊] Speed of sound, isentropic compressibilities, and excess molar volumes of binary mixtures containing p-dioxane
    The speed of sound u in and densities rho of eight binary mixtures of p-dioxane (p-C4H8O2) with methylcyclohexane (c-C6H11CH3), 1-chlorohexane (C6H13Cl), 1-bromohexane (C6H13Br), p-xylene [C6H4(CH3)(2)], propylbenzene (C6H5C3H7), methyl acetate CH3COOCH3), butyl acetate (CH3COOC4H9), and amyl acetate (CH3COOC5H11) were measured over the whole composition range at 30 degrees C. Isentropic compressibilities (K-s), Rao's molar sound functions (R), excess molar volumes (V-E), excess isentropic compressibilities (K-S(E)), together with relative change in volume Delta V/phi(1)phi(2) values, have been obtained for all measured mole fractions. The excess partial molar volume (V-1-V-1(0)) of p-dioxane in different solvents have also been estimated. The experimental results have been analyzed in terms of the Prigogine-Flory-Patterson theory of solutions. [References: 29]
  • [期刊] Thermodynamic properties of binary mixtures formed by cyclic ethers and chloroalkanes
    Densities, speeds of sound and refractive indices of the binary mixtures 1,3-dioxolane or 1,4-dioxane+1-chloropentane or 1-chlorohexane have been measured at the temperatures of 298.15 and 313.15 K. Excess molar volumes, isentropic compressibilities, isentropic compressibility deviations and refractive index deviations have been obtained from experimental data. Excess molar volumes, isentropic compressibility and refractive index deviations have been fitted to a Redlich-Kister equation. Excess molar volumes, speeds of sound and isentropic compressibilities have been estimated at 298.15 K using the Prigogine-Flory-Patterson theory.
  • [期刊] Porphyrins on mica: Atomic force microscopy imaging in organic solvents
    Adsorption of 5,10,15,20-tetraphenyl-21H,23H-porphyrin cobalt (CoTPP) on mica immersed in organic solvents of 1-hexanol, 1-chlorohexane, and 1-phenyloctane was examined. Flat-lying CoTPP molecules were recognized in topographic images observed by atomic force microscopy. The topographic height of individual porphyrins fluctuated by 0.2 nm in a time scale of 10 s. The height fluctuation was ascribed to two states with and without a solvent molecule trapped in the axial ligand position of the CoTPP. In imaging in phenyloctane, adsorbed CoTPPs were removed by adding 1-hexylamine to the imaging solution. Hexylamine ligands would have occupied the axial position of CoTPP to hinder adsorption. In addition, two-dimensional distribution of force pushing the tip was observed in hexanol to show a layered liquid structure parallel to the mica surface.
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