Slow, non-diffusive dynamics in concentrated nanoemulsions
摘要
Using multispeckle x-ray photon correlation spectroscopy, we have measured the slow, wave-vector dependent dynamics of concentrated, disordered nanoemulsions composed of silicone oil droplets in water. The intermediate scattering function possesses a compressed exponential lineshape and a relaxation time that varies inversely with wave vector. We interpret these dynamics as strain in response to local stress relaxation. The motion includes a transient component whose characteristic velocity decays exponentially with time following a mechanical perturbation of the nanoemulsions and a second component whose characteristic velocity is essentially independent of time. The steady-state characteristic velocity is surprisingly insensitive to droplet volume fraction in the concentrated regime, indicating that the strain motion is only weakly dependent on the droplet-droplet interactions.
引用
@article{arxiv.cond-mat/0701540,
title = {Slow, non-diffusive dynamics in concentrated nanoemulsions},
author = {H. Guo and J. N. Wilking and D. Liang and T. G. Mason and J. L. Harden and R. L. Leheny},
journal= {arXiv preprint arXiv:cond-mat/0701540},
year = {2007}
}
备注
9 pages, 6 figures