Does Gravity Cause Load-Bearing Bridges in Colloidal and Granular Systems?

被引：19

作者：

Jenkins, M. C. ^{[1
,2
,3
]}

Haw, M. D. ^{[4
]}

Barker, G. C. ^{[5
]}

Poon, W. C. K. ^{[1
,2
]}

Egelhaaf, S. U. ^{[3
]}

机构：

[1] Univ Edinburgh, SUPA, Edinburgh EH9 3JZ, Midlothian, Scotland

[2] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

[3] Univ Dusseldorf, Condensed Matter Phys Lab, D-40225 Dusseldorf, Germany

[4] Univ Strathclyde, Dept Chem & Proc Engn, Glasgow G1 1XJ, Lanark, Scotland

[5] Inst Food Res, Norwich NR4 7UA, Norfolk, England

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

HARD-SPHERE; COMPUTER-SIMULATION; CRYSTALLIZATION; SUSPENSIONS; MICROSCOPY; PACKING;

D O I：

10.1103/PhysRevLett.107.038302

中图分类号：

O4 [物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

We study structures which can bear loads, "bridges", in particulate packings. To investigate the relationship between bridges and gravity, we experimentally determine bridge statistics in colloidal packings. We vary the effective magnitude and direction of gravity, volume fraction, and interactions, and find that the bridge size distributions depend only on the mean number of neighbors. We identify a universal distribution, in agreement with simulation results for granulars, suggesting that applied loads merely exploit preexisting bridges, which are inherent in dense packings.

引用

页数：4

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