Dense random packings of spherocylinders

Zhao, Jian; Li, Shuixiang; Zou, Ruiping; Yu, Aibing

doi:10.1039/c1sm06487h

Cited by 141 publications

(109 citation statements)

References 34 publications

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“…Moreover, it occurs that the highest packing were found for particles (ellipsoids, spherocylinders or dimers) of long-to-short axis ratio around 1.5, which is similar as for RSA in two dimensions. These results were confirmed both: numerically 24,26,27 and theoretically 28 .…”

Section: Introductionsupporting

confidence: 67%

Shapes for maximal coverage for two-dimensional random sequential adsorption

Cieśla

Pajk

Ziff

2015

Phys. Chem. Chem. Phys.

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The random sequential adsorption of various particle shapes is studied in order to determine the influence of particle anisotropy on the saturated random packing. For all tested particles there is an optimal level of anisotropy which maximizes the saturated packing fraction. It is found that a concave shape derived from a dimer of disks gives a packing fraction of 0.5833, which is comparable to the maximum packing fraction of ellipsoids and spherocylinders and higher than other studied shapes. Discussion why this shape is beneficial for random sequential adsorption is given.

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Section: Introductionsupporting

confidence: 67%

Shapes for maximal coverage for two-dimensional random sequential adsorption

Cieśla

Pajk

Ziff

2015

Phys. Chem. Chem. Phys.

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“…101,102 In a quite different context, investigations on jammed random packing of non-spherical granular matter have been also performed aimed at discussing the effect of shape and size of the particles on the packing density. [104][105][106][107][108][109][110][111] For mixtures of HS with HSC of the same diameter and with an HSC aspect ratio less than 1.3, it was shown that the mixture, which can be either in a segregated or in a dispersive state, always exhibits isochoric ideality. 109,110 The picture of the solvation in the mixture brought at the molecular level by spectroscopy may help in understanding the volumetric isothermal expansion ("swelling") of the CS 2 liquid phase.…”

Section: Discussion On the Non-ideal Behaviour Of The Mixturementioning

confidence: 99%

Assessing the non-ideality of the CO2-CS2 system at molecular level: A Raman scattering study

Besnard

Cabaço²,

Coutinho

et al. 2013

The Journal of Chemical Physics

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The dense phase of CO 2 -CS 2 mixtures has been analysed by Raman spectroscopy as a function of the CO 2 concentration (0.02-0.95 mole fractions) by varying the pressure (0.5 MPa up to 7.7 MPa) at constant temperature (313 K). The polarised and depolarised spectra of the induced (ν 2 , ν 3 ) modes of CS 2 and of the ν 1 -2ν 2 Fermi resonance dyad of both CO 2 and CS 2 have been measured. Upon dilution with CO 2 , the evolution of the spectroscopic observables of all these modes displays a "plateau-like" region in the CO 2 mole fraction 0.3-0.7 never previously observed in CO 2 -organic liquids mixtures. The bandshape and intensity of the induced modes of CS 2 are similar to those of pure CS 2 up to equimolar concentration, after which variations occur. The preservation of the local ordering from pure CS 2 to equimolar concentration together with the non-linear evolution of the spectroscopic observables allows inferring that two solvation regimes exist with a transition occurring in the plateau domain. In the first regime, corresponding to CS 2 concentrated mixtures, the liquid phase is segregated with dominant CS 2 clusters, whereas, in the second one, CO 2 monomers and dimers and CO 2 -CS 2 hetero-dimers coexist dynamically on a picosecond time-scale. It is demonstrated that the subtle interplay between attractive and repulsive interactions which provides a molecular interpretation of the non-ideality of the CO 2 -CS 2 mixture allows rationalizing the volume expansion and the existence of the plateau-like region observed in the pressure-composition diagram previously ascribed to the proximity of an upper critical solution temperature at lower temperatures.

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“…Experimental limitations have motivated the use of simulations to predict critical packing parameters. Zhao et al simulated spherocylinder packing of varying aspect ratio α and observed the effects on packing fraction ϕ and contact number c (Zhao et al, 2012). These studies, the results of which are re-printed in the Discussion (see 'Ants maintain spacing using active pushing of their legs'), will provide insight into how ants improve their packing properties using both their behavior and their geometry.…”

Section: Research Articlementioning

confidence: 98%

Fire ants actively control spacing and orientation within self-assemblages

Foster

Mlot

Lin

et al. 2014

Journal of Experimental Biology

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To overcome obstacles and survive harsh environments, fire ants link their bodies together to form self-assemblages such as rafts, bridges and bivouacs. Such structures are examples of self-assembling and self-healing materials, as ants can quickly create and break links with one another in response to changes in their environment. Because ants are opaque, the arrangement of the ants within these threedimensional networks was previously unknown. In this experimental study, we applied micro-scale computed tomography, or micro-CT, to visualize the connectivity, arrangement and orientation of ants within an assemblage. We identified active and geometric mechanisms that ants use to obtain favorable packing properties with respect to wellstudied packing of inert objects such as cylinders. Ants use their legs to push against their neighbors, doubling their spacing relative to random packing of cylinders. These legs also permit active control of their orientation, an ability ants use to arrange themselves perpendicularly rather than in parallel. Lastly, we found an important role of ant polymorphism in promoting self-aggregation: a large distribution of ant sizes permits small ants to fit between the legs of larger ants, a phenomenon that increases the number of average connections per ant. These combined mechanisms lead to low packing fraction and high connectivity, which increase raft buoyancy and strength during flash floods.

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Dense random packings of spherocylinders

Cited by 141 publications

References 34 publications

Shapes for maximal coverage for two-dimensional random sequential adsorption

Shapes for maximal coverage for two-dimensional random sequential adsorption

Assessing the non-ideality of the CO2-CS2 system at molecular level: A Raman scattering study

Fire ants actively control spacing and orientation within self-assemblages

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