Difference between revisions of "Single-particle Brownian dynamics for characterizing the rheology of fluid Langmuir monolayers"

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[[image:monolayer2.png]]
 
[[image:monolayer2.png]]
  
The separation <L>
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The separation <L<sup>2</sup>>
  
 
For brownian motions of particles completely submerged in fluid, the  
 
For brownian motions of particles completely submerged in fluid, the  

Revision as of 17:53, 26 November 2011

Introduction

The authors attempted to probe the rheology of fluid langmuir monolayers by tracking the diffusion of single particles at air-water interface. It is similar in spirit to the tracking of particles to study the rheology of three dimensional materials. The set-up is shown in figures 1 and 2. Polystyrene beads are interpersed in a bead of water in the presence of 3 different monolayers: N-palmitoyl-6-n-penicillanic acid (PPA), pentadecanoic acid (PDA) and L-α-dipalmitoyl- phosphatidylcholine (DPPC). The contact angle that the polystyrene beads make with the water can be measured using the set-up shown in figure 2 using the formula

Monolayer1.1.png

where β is the water-glass contact angle.

Monolayer1.png

Monolayer2.png

The separation <L2>

For brownian motions of particles completely submerged in fluid, the

Results

Monolayer3.png

Monolayer4.png

Personal Thoughts

References

1. Single-particle brownian dynamics for characterizing the rheology of fluid langmuir monolayers, Sickert et al, EPL 2007