The limiting negative pressures of liquid <i>n</i>-hexane and <i>n</i>-dodecane

Huang, H. S.; Winnick, Jack

doi:10.1063/1.432608

The Journal of Chemical Physics

1976

DOI: 10.1063/1.432608

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The limiting negative pressures of liquid n-hexane and n-dodecane

H. S. Huang¹,

Jack Winnick²

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Cited by 3 publications

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“…Recent results for small angle x-ray scattering for aqueous solutions of amphiphilic tetraalkyl-ammonium cations at ambient conditions suggest that the strengthening of the structure of hydration water is present only for solutes with radius smaller than ≈ 0.44 nm [24]. We therefore repeat our analysis for small nanoparticles with R = 0.4 nm, and find that our results are robust if the amount of hydrophobic interface in contact with water is kept constant with respect to the case of R = 1.6 nm.…”

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confidence: 99%

Large Decrease of Fluctuations for Supercooled Water in Hydrophobic Nanoconfinement

et al. 2011

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Using Monte Carlo simulations we study a coarse-grained model of a water layer confined in a fixed disordered matrix of hydrophobic nanoparticles at different particle concentrations c. For c = 0 we find a first-order liquid-liquid phase transition (LLPT). For c > 0 our simulations are consistent with a LLPT line ending in two critical points at low and high pressure P . For c = 25% at high P and low temperature T we find a dramatic decrease of compressibility K T , thermal expansion coefficient α P , and specific heat C P . Surprisingly, the effect is present also for c as low as 2.4%. We conclude that even a small presence of nanoscopic hydrophobes can drastically suppress therodynamic fluctuations, making the detection of the LLPT more difficult.

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Large Decrease of Fluctuations for Supercooled Water in Hydrophobic Nanoconfinement

et al. 2011

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Depolarized Rayleigh scattering and orientational motion of polyethylene glycol

Jones

Wang

1977

The Journal of Chemical Physics

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The depolarized Rayleigh light scattering spectra of pure polyethylene glycols and their solutions in an optically isotropic solvent were studied as a function of polymer molecular weight, concentration, and temperature. Reorientational relaxation times were obtained by fitting the observed spectra to Lorentzian functions convoluted with the experimental spectrum. The relaxation times were found to increase with increasing molecular weight and with dilution. The depolarized Rayleigh results for the polyethylene glycols were compared with results for other polymer systems and with results obtained using other types of relaxation studies. By studying the dependence of the relaxation times on viscosity, temperature, and concentration and comparing the results with theoretical predictions of molecular and end-group reorientations, we have associated the depolarized Rayleigh spectra of polyethylene glycol with rotation of the entire polymer molecule.

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Rayleigh–Brillouin spectra of polymer fluids: Polyphenylmethyl siloxane and polydimethylphenylmethyl siloxane

Fytas

Chu

1981

The Journal of Chemical Physics

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Measurements of Rayleigh–Brillouin spectra of polyphenylmethyl siloxane (A) and of polydimethylphenylmethyl siloxane (B) over a wide range of temperatures (270 to 520 K for A; 280 to 390 K for B) are reported. By using the generalized hydrodynamic theory for Rayleigh–Brillouin spectra as developed by Lin and Wang, we have determined the relaxation strength R, the relaxation rate t, the activation energy Ea, and the adiabatic sound frequency ws (T), which are the characteristic physical quantities describing the dynamics of a viscoelastic polymer fluid in the GHz region. Based on those parameters, we were able to obtain excellent agreement between the theoretical and the measured spectra.

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The limiting negative pressures of liquid n-hexane and n-dodecane

Cited by 3 publications

References 3 publications

Large Decrease of Fluctuations for Supercooled Water in Hydrophobic Nanoconfinement

Large Decrease of Fluctuations for Supercooled Water in Hydrophobic Nanoconfinement

Depolarized Rayleigh scattering and orientational motion of polyethylene glycol

Rayleigh–Brillouin spectra of polymer fluids: Polyphenylmethyl siloxane and polydimethylphenylmethyl siloxane

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