TY  - JOUR
AU  - Wysocki, A.
AU  - Royall, C.P.
AU  - Winkler, R. G.
AU  - Gompper, G.
AU  - Tanaka, H.
AU  - van Blaaderen, A.
AU  - Löwen, H.
TI  - Direct observation of hydrodynamic instabilities in a driven non-uniform colloidal dispersion
JO  - Soft matter
VL  - 5
SN  - 1744-683X
CY  - Cambridge
PB  - Royal Society of Chemistry (RSC)
M1  - PreJuSER-3902
SP  - 1340 - 1344
PY  - 2009
N1  - We acknowledge ZIM for computing time. A. W. thanks E. W. Laedke and G. Lehmann for help. We acknowledge A. A. Louis and J. T. Padding for discussions. The authors are grateful to Didi Derks for a kind gift ofPMMAcolloids. A. W., R. G. W., G. G., H. L. and A. v. B. thank the DFG/ FOM for support in particular via SFB TR6 ( projects A3, A4 and D3). C. P. R. acknowledges the Royal Society for Funding. H. T. acknowledges a grant- in- aid from MEXT.
AB  - A Rayleigh - Taylor-like instability of a dense colloidal layer under gravity in a capillary of microfluidic dimensions is considered. We access all relevant lengthscales with particle-level microscopy and computer simulations which incorporate long-range hydrodynamic interactions between the particles. By tuning the gravitational driving force, we reveal a mechanism whose growth is connected to the fluctuations of specific wavelengths, non-linear pattern formation and subsequent diffusion-dominated relaxation. Our linear stability theory captures the initial regime and thus predicts mixing conditions, with important implications for fields ranging from biology to nanotechnology.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000264524300004
DO  - DOI:10.1039/b821250c
UR  - https://juser.fz-juelich.de/record/3902
ER  -