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@ARTICLE{SinghNegi:48459,
      author       = {Singh Negi, A. and Sengupta, K. and Sood, A. K.},
      title        = {{F}requency-{D}ependent {S}hape {C}hanges of {C}olloidal
                      {C}lusters under {T}ransverse {E}lectric {F}ield},
      journal      = {Langmuir},
      volume       = {21},
      issn         = {0743-7463},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {PreJuSER-48459},
      pages        = {11623},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We 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.},
      keywords     = {J (WoSType)},
      cin          = {ISG-4},
      ddc          = {670},
      cid          = {I:(DE-Juel1)VDB44},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Chemistry, Multidisciplinary / Chemistry, Physical /
                      Materials Science, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:16316092},
      UT           = {WOS:000233730200016},
      doi          = {10.1021/la051258b},
      url          = {https://juser.fz-juelich.de/record/48459},
}