Kinetics of surface enrichment: A molecular dynamics study.
We use molecular dynamics to study the kinetics of surface enrichment (SE) in a stable homogeneous mixture (AB), placed in contact with a surface which preferentially attracts A. The SE profiles show a characteristic double-exponential behavior with two length scales: ξ(-), which rapidly saturates to its equilibrium value, and ξ(+), which diverges as a power-law with time (ξ(+)∼t(θ)). We find that hydrodynamic effects result in a crossover of the growth exponent from θ≃0.5 to θ≃1.0. There is also a corresponding crossover in the growth dynamics of the SE layer thickness.
School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Prabhat K
PK
Jaiswal
Sanjay
S
Puri
Subir K
SK
Das