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Few attempts to measure dynamic properties of strong scatterers (such as colloidal particles) close to a wall by EWDLS have been reported [(15); see also C. S. Park, M. Copic, R. Mahmood, N. A. Clark, Liq. Cryst. 16, 135 (1995); A. H. Marcus, B. Uu, S. A. Rice, Phys. Rev. E 53, 1965 (1996)]. For weak scattering, however, careful optical alignment to minimize parasitic scattering and control experiments to ensure homodyne detection for both static and dynamic measurements are crucial for the quality of the experimental functions and the technical validity of the data.
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Few attempts to measure dynamic properties of strong scatterers (such as colloidal particles) close to a wall by EWDLS have been reported [(15); see also C. S. Park, M. Copic, R. Mahmood, N. A. Clark, Liq. Cryst. 16, 135 (1995); A. H. Marcus, B. Uu, S. A. Rice, Phys. Rev. E 53, 1965 (1996)]. For weak scattering, however, careful optical alignment to minimize parasitic scattering and control experiments to ensure homodyne detection for both static and dynamic measurements are crucial for the quality of the experimental functions and the technical validity of the data.
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85033166823
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note
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A PS/toluene solution displays about four times less scattering than an equivalent PS/dioxane solution because of the difference in the refractive index increment.
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21
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85033163585
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note
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-1 at 23°C, respectively.
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22
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85033176896
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note
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-1, respectively). For the shortest PEO-PS/80 layer, C(q, f ) at high q's shows an additional faster process that, in contrast to the layer relaxation, is diffusive. Hence, the two processes tend to merge at low q's (see Flg. 3); this, in addition to the decreasing intensity of the layer relaxation with decreasing q (insets of Fig. 2, B and C), renders the analysis of C(q, t ) at low q's ambiguous.
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26
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0026869529
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G. H. Fredrickson, A. Ajdari, L. Leibler, J. P. Carton, Macromolecules 25, 2882 (1992).
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Fredrickson, G.H.1
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Carton, J.P.4
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30
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85033173031
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note
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q are, respectively, the concentration and layer height fluctuations.
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32
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85033166007
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note
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We thank G. Petekidis for his assistance and constructive comments, A. N. Semenov for critically reading the manuscript, and M. Stamm for stimulating discussions. Part of this research was sponsored by the European Union (International Scientific Cooperation, contract ISC*CT93-0951) and by NATO's Scientific Affairs Division (Science for Stability Programme). B.F. acknowledges the support of an NSF/ NATO postdoctoral fellowship.
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