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Bae, Sung Chul
Multiscale Optical Imaging Lab
Research Interests
  • Multiscale optical imaging, laser spectroscopy, laser microscopy, laser sensing, soft matter physics, surface and interfacial science, laser Matter Interaction

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Supracolloidal Reaction Kinetics of Janus Spheres

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Title
Supracolloidal Reaction Kinetics of Janus Spheres
Author
Chen, QianWhitmer, Jonathan K.Jiang, ShanBae, Sung ChulLuijten, ErikGranick, Steve
Keywords
CLUSTERS; GROWTH
Issue Date
201101
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE, v.331, no.6014, pp.199 - 202
Abstract
Clusters in the form of aggregates of a small number of elemental units display structural, thermodynamic, and dynamic properties different from those of bulk materials. We studied the kinetic pathways of self-assembly of "Janus spheres" with hemispherical hydrophobic attraction and found key differences from those characteristic of molecular amphiphiles. Experimental visualization combined with theory and molecular dynamics simulation shows that small, kinetically favored isomers fuse, before they equilibrate, into fibrillar triple helices with at most six nearest neighbors per particle. The time scales of colloidal rearrangement combined with the directional interactions resulting from Janus geometry make this a prototypical system to elucidate, on a mechanistic level and with single-particle kinetic resolution, how chemical anisotropy and reaction kinetics coordinate to generate highly ordered structures.
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DOI
http://dx.doi.org/10.1126/science.1197451
ISSN
0036-8075
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