Effect of bond and asymmetry of 2D-dumbbells on their structure in high concentration regime

Cited 6 time in webofscience Cited 0 time in scopus
  • Hit : 396
  • Download : 525
Particle shape is one of the major parameters governing the structure in hard-particle systems. A 2D-dumbbell, which consists of a pair of binary disks connected to each other, has two geometrical characteristics: the existence of a bond and asymmetry due to a size difference. We investigate the effects of the geometry of 2D-dumbbells on the packing structure at an air-water interface under short-range attractions, varying the area fraction phi of the particles. We observe that although the systems at low phi exhibit the characteristic structure of attractive particle systems, the short-range attraction between the particles due to capillary interaction does not affect the local structure at the maximally random jammed (MRJ) packing fraction. We investigate the influence of a rigid bond on the packing structure by comparing 2D-dumbbell systems with binary-disk systems; we also investigate the effects of asymmetry by controlling the diameter ratio (gamma) of the small and large disks of the dumbbell. First, we find that the existence of a bond restricts local segregations between similar kinds of disks, so that phase-separated glass states are forbidden, contrary to the case of binary-disk systems. Second, we observe that varying gamma causes a structural order-disorder-order change at high phi. While the crystalline structures of disks (gamma = 0) and symmetric dimers (gamma = 1) are similar in local contacting and ordering behaviors despite their shape differences, the amorphous structures of asymmetric dimers (gamma = 0.3, 0.5, and 0.7) exhibit distinct features depending on gamma.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2012-09
Language
English
Article Type
Article
Keywords

BINARY DISK MIXTURES; COLLOIDAL DIMERS; HARD-SPHERE; PACKINGS; TRANSITION; ANISOTROPY; PARTICLES; KEPLER; FILMS

Citation

SOFT MATTER, v.8, no.34, pp.9015 - 9021

ISSN
1744-683X
DOI
10.1039/c2sm26437d
URI
http://hdl.handle.net/10203/104007
Appears in Collection
PH-Journal Papers(저널논문)
Files in This Item
c2sm26437d.pdf(715.75 kB)Download
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 6 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0