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000048459 0247_ $$2DOI$$a10.1021/la051258b
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000048459 084__ $$2WoS$$aChemistry, Multidisciplinary
000048459 084__ $$2WoS$$aChemistry, Physical
000048459 084__ $$2WoS$$aMaterials Science, Multidisciplinary
000048459 1001_ $$0P:(DE-HGF)0$$aSingh Negi, A.$$b0
000048459 245__ $$aFrequency-Dependent Shape Changes of Colloidal Clusters under Transverse Electric Field
000048459 260__ $$aWashington, DC$$bACS Publ.$$c2005
000048459 300__ $$a11623
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000048459 520__ $$aWe have studied clustering of colloidal particles under the influence of an ac electric field as a function of frequency. The field was applied in a direction perpendicular to the confining walls. Two regimes are observed, a low frequency regime where the clusters are isotropic with a local triangular order, as reported earlier in the literature, and a new high-frequency regime where the clusters are highly elongated (anisotropic) with no local order. The crossover from one regime to the other occurs at a critical frequency, f(c). The threshold field for the cluster formation, E(th), increases with frequency in both the regimes. An increase in the particle size leads to a reduction in both E(th) and f(c). We present evidence to show that the elongated structures seen at high frequency are related to the field inhomogeneities at imperfections on the conducting surface. We also propose a possible mechanism based on hydrodynamic flow considerations to explain the formation of these clusters.
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000048459 7001_ $$0P:(DE-Juel1)VDB57655$$aSengupta, K.$$b1$$uFZJ
000048459 7001_ $$0P:(DE-HGF)0$$aSood, A. K.$$b2
000048459 773__ $$0PERI:(DE-600)2005937-1$$a10.1021/la051258b$$gVol. 21, p. 11623$$p11623$$q21<11623$$tLangmuir$$v21$$x0743-7463$$y2005
000048459 8567_ $$uhttp://hdl.handle.net/2128/2180$$uhttp://dx.doi.org/10.1021/la051258b
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