TY  - JOUR
AU  - Cichocki, B.
AU  - Wajnryb, E.
AU  - Blawzdziewicz, J.
AU  - Dhont, J. K. G.
AU  - Lang, P. R.
TI  - The intensity correlation function in evanescent wave scattering
JO  - The journal of chemical physics
VL  - 132
SN  - 0021-9606
CY  - Melville, NY
PB  - American Institute of Physics
M1  - PreJuSER-8830
SP  - 074704
PY  - 2010
N1  - J.B. would like to acknowledge financial support from NSF Grant Nos. CBET-0348175 and CBET-0931504. J.K.G.D. and P.R.L. acknowledge financial support by the EU-FP7 Network "NanoDirect" (Contract No. CP-FP-213948-2). B.C. acknowledges support by the Deutsche Forschungsgemeinschaft (SFB-TR6, Project No. A01).
AB  - As a first step toward the interpretation of dynamic light scattering with evanescent illumination from suspensions of interacting spheres, in order to probe their near wall dynamics, we develop a theory for the initial slope of the intensity autocorrelation function. An expression for the first cumulant is derived that is valid for arbitrary concentrations, which generalizes a well-known expression for the short-time, wave-vector dependent collective diffusion coefficient in bulk to the case where a wall is present. Explicit expressions and numerical results for the various contributions to the initial slope are obtained within a leading order virial expansion. The dependence of the initial slope on the components of the wave vector parallel and perpendicular to the wall, as well as the dependence on the evanescent-light penetration depth are discussed. For the hydrodynamic interactions between colloids and between the wall, which are essential for a correct description of the near-interface dynamics, we include both far-field and lubrication contributions. Lubrication contributions are essential to capture the dynamics as probed in experiments with small penetration depths. Simulations have been performed to verify the theory and to estimate the extent of the concentration range where the virial expansion is valid. The computer algorithm developed for this purpose will also be of future importance for the interpretation of experiments and to develop an understanding of near-interface dynamics, at high colloid concentrations.
KW  - Algorithms
KW  - Colloids: chemistry
KW  - Computer Simulation
KW  - Diffusion
KW  - Light
KW  - Models, Chemical
KW  - Particle Size
KW  - Radiation
KW  - Scattering, Radiation
KW  - Spectrum Analysis
KW  - Surface Properties
KW  - Colloids (NLM Chemicals)
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:20170241
UR  - <Go to ISI:>//WOS:000274756000034
DO  - DOI:10.1063/1.3305328
UR  - https://juser.fz-juelich.de/record/8830
ER  -