Difference between revisions of "Elasticity of interfacial particle rafts"

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Capillary forces are responsible for the formation of the solid monolayer via the aggregation of particles trapped at the interface and give the monolayer cohesion under deformation. The particle monolayer studied here are distinct from other two-dimensional interfacial systems such as Langmuir monolayers because the large size of the particles(diameters of up to 6mm) makes them non-Brownian objects which interact solely via capillary attraction.In this respect they are similar to conventional bubble rafts, so they are called particle rafts here.
 
Capillary forces are responsible for the formation of the solid monolayer via the aggregation of particles trapped at the interface and give the monolayer cohesion under deformation. The particle monolayer studied here are distinct from other two-dimensional interfacial systems such as Langmuir monolayers because the large size of the particles(diameters of up to 6mm) makes them non-Brownian objects which interact solely via capillary attraction.In this respect they are similar to conventional bubble rafts, so they are called particle rafts here.
  
In this system, it is reasonable to assume that the particle raft behaves approximately as an isotropic solid, in which case its elastic behavior can be completely characterised in terms of Young's modulus, E, and Poisson ratio, <math>\nv</math>. These parameters are theoretically determined here.
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In this system, it is reasonable to assume that the particle raft behaves approximately as an isotropic solid, in which case its elastic behavior can be completely characterised in terms of Young's modulus, E, and Poisson ratio, <math>\nu</math>. These parameters are theoretically determined here.
  
 
==Connection to Soft Matter==
 
==Connection to Soft Matter==

Revision as of 02:51, 6 October 2009

Original Entry by Xu Zhang for AP225, Fall 2009

Reference

Elasticity of interfacial particle rafts, Vella, D., P. Aussillous and L. Mahadevan, Europhysics Letters, 68 (2), 212-18, 2004

Key Words

monolayer, elasticity, Young's modulus, Poisson ratio

Summary

In this paper, the collective behavior of a closed-packed monolayer of non-Brownian particles at a fluid-liquid interface is studied. Such particle layers behave like 2D elastic solids:

1.A monolayer buckles under sufficient static compressive loading demonstrating its ability to support and anistropic stress. This stress can only be supported by a material with a non-zero shear modulus, which is the signature of solid.

2.A monolayer fractures under relatively small tensions, which is also a properties of solid.

Capillary forces are responsible for the formation of the solid monolayer via the aggregation of particles trapped at the interface and give the monolayer cohesion under deformation. The particle monolayer studied here are distinct from other two-dimensional interfacial systems such as Langmuir monolayers because the large size of the particles(diameters of up to 6mm) makes them non-Brownian objects which interact solely via capillary attraction.In this respect they are similar to conventional bubble rafts, so they are called particle rafts here.

In this system, it is reasonable to assume that the particle raft behaves approximately as an isotropic solid, in which case its elastic behavior can be completely characterised in terms of Young's modulus, E, and Poisson ratio, <math>\nu</math>. These parameters are theoretically determined here.

Connection to Soft Matter