High-pressure phases of cyclohexane-<i>d</i>
                  <sub>12</sub>

Wilding, Nigel B.; Hatton, P. D.; Pawley, G. S.

doi:10.1107/s0108768191004536

Cited by 14 publications

(22 citation statements)

References 9 publications

(12 reference statements)

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“…3 with that obtained previously under the same conditions [ Fig. 2b of Wilding et al (1991)] reveals significant discrepancies between the relative intensities of the Bragg peaks. We interpret this irreproducibility as arising from powder inhomogeneities, implying that the silica wool is not entirely effective in producing a fine powder.…”

Section: Neutron Powder Diffraction Studies Of C6d~z At High Pressuresupporting

confidence: 56%

“…At a pressure of 5 kbar, the sample was cooled from room temperature to 250 K. A short scan at this temperature yielded a powder pattern consistent with the known unit-cell parameters of phase IV, as previously determined by Wilding et al (1991). A high-quality data set suitable for structure determination was then collected over a period of 4 h, yielding data in the 20 range 0-120 ° with a 20 step size of 0.05 °.…”

Section: Neutron Powder Diffraction Studies Of C6d~z At High Pressurementioning

confidence: 93%

“…Although no structural information has yet been deduced for the recently discovered phase V, detailed structural information on phases III and IV has recently been published by Wilding, Hatton & Pawley (1991). These authors performed a highpressure neutron powder diffraction study and successfully determined the unit cell and space group of both phases.…”

Section: Introductionmentioning

confidence: 99%

“…Strict constraints were applied to the molecule to ensure that the bond lengths and bond angles remained constant -only the orientation of the molecule was permitted to vary. The refinement was performed subject to the P12~/nl space group with Z=2, as previously determined by Wilding et al (1991). This space group dictates that the centre of one molecule coincides with the unit-cell corner, while the centre of the other molecule lies at the cell centre.…”

Section: Neutron Powder Diffraction Studies Of C6d~z At High Pressurementioning

confidence: 99%

“…The points ( x ) at 293 K correspond to the boundary of phase III as determined by Haines & Gilson (1989, 1990. The point (o) at 5 kbar, 265 K indicates the position of the phase III-IV boundary determined by Wilding et al (1991).…”

Section: Introductionmentioning

confidence: 99%

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Structural studies of cyclohexane IV

Wilding¹,

Crain²,

Hatton³

et al. 1993

Acta Crystallogr Sect B

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We report an extensive neutron powder diffraction study of the high-pressure phase IV of cyclohexanediE. Using constrained Rietveld refinement we deduce approximate atomic positions for this phase which are found to be in close accord with the predictions of energy-minimization calculations. The likely relationship between the unit cell of phase IV and that of the ambient-pressure phase II is also presented. We further demonstrate, by means of an X-ray powder diffraction study of cyclohexane-hl2, that phase IV can be produced in a metastable state at ambient pressure by rapid quenching to 77 K from the liquid. This finding contradicts a previous report [Burns & Dacol (1984). Solid State Commun. 51,[773][774][775] claiming that the ambient-pressure metastable phase is an orientational glass.

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Section: Neutron Powder Diffraction Studies Of C6d~z At High Pressuresupporting

confidence: 56%

Section: Neutron Powder Diffraction Studies Of C6d~z At High Pressurementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Neutron Powder Diffraction Studies Of C6d~z At High Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structural studies of cyclohexane IV

Wilding¹,

Crain²,

Hatton³

et al. 1993

Acta Crystallogr Sect B

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Damping Properties of Nanoporous Carbon‐Cyclohexane Mixtures

2007

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Using liquids in mounting stages, packaging layers, helmets and healthcare pads, etc. has been a common engineering practice. [1] Usually, a "liquid damper" contains a sealing layer and a liquid core, which can nearly perfectly fit with the target to be protected. As a result, the contact area is maximized and thus the contact pressure is lowered. Damages associated with interface mismatches that commonly exist in solid systems, especially in systems of changing configurations, are also largely reduced. Additionally, the internal friction caused by liquid motions can considerably change the load and deformation distribution profiles. For instance, shear thickening liquids exhibit attractive mechanical characteristics when subjected to high-strain-rate shear loadings, and therefore can be used in protection layers, soldier armors, among others. [2] A major problem of most of the liquid systems is that the compressibility of the liquids is poor, and the loading-unloading processes are reversible. Consequently, under a compressive loading, the energy absorption of the liquid phase is negligible. While this is not an issue for quasistatic loadings, for dynamics loadings the transmitted highstress waves can cause serious damages, e.g. blast-lung problems. [3,4] In order to improve the energy dissipation capacities of liquids, the technique of nanoporous-admixture functionalization has been recently developed. [5][6][7][8][9] By immersing a lyophobic nanoporous material in a liquid, as the pressure is increased so that the capillary effect is overcome, the liquid can be compressed into the nanopores, accompanied by the large increase in liquid-solid contact area. Since the specific area of a nanoporous material is typically millions of times larger than in bulk materials, the associated specific free energy increase can be as high as 10-100 J/g; that is, as the energy converted from the quasi-hydrostatic pressure to the solid-liquid interfacial tension can be regarded as being dissipated, the energy absorption efficiency of the nanoporous liquid is ultrahigh. However, the previous studies were mainly focused on nanoporous silicas and zeolite-like materials, which are relatively cost inefficient, especially for largescale structures such as damping foundations. It would be desirable if more available materials, such as nanoporous carbons, can be used for energy absorption applications. Moreover, in the previously developed systems, the system recoverability was usually quite poor; i.e. after the first loadingunloading cycle, since most of the confined liquid could not defiltrate from the nanopores, the energy absorption capacity became much smaller at the second loading. While a few techniques, such as thermal treatment and recovery agent addition have been developed, [10,11] the system performance under cyclic loadings was still far from satisfactory. Results and DiscussionIn the current study, we investigated two J. B. Baker nanoporous carbons: E-343 and E-345 using the experimental setup depicted in Figure 1. The res...

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Monte Carlo Simulation of the Rotator Phase of Cyclohexane

Würflinger

1995

Ber Bunsenges Phys Chem

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The reorientational behaviour of cyclohexane molecules in the rotator phase has been investigated with a Monte Carlo simulation on a system of 108 molecules in a cubic box with periodic boundary conditions. Different starting configurations have been tested, including also a special model where the molecules are aligned parallelly to the four cubic threefold axes. This model is characterized by a low potential energy. The discrete molecular orientations of this model are maintained at 195 K, that is, in the immediate neighbourhood to the low-temperature solid 11-solid I transition. At higher temperatures no preferred orientations can be detected, irrespective of the employed starting set up. Both the molecular three-fold axes and the angles between them of neighbouring molecules are distributed randomly. Therefore the Frenkel model of a discrete number of preferred orientations is discounted.

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High-pressure phases of cyclohexane-d ₁₂

Cited by 14 publications

References 9 publications

Structural studies of cyclohexane IV

Structural studies of cyclohexane IV

Damping Properties of Nanoporous Carbon‐Cyclohexane Mixtures

Monte Carlo Simulation of the Rotator Phase of Cyclohexane

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High-pressure phases of cyclohexane-d 12

Cited by 14 publications

References 9 publications

Structural studies of cyclohexane IV

Structural studies of cyclohexane IV

Damping Properties of Nanoporous Carbon‐Cyclohexane Mixtures

Monte Carlo Simulation of the Rotator Phase of Cyclohexane

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Product

Resources

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High-pressure phases of cyclohexane-d ₁₂