Supracolloidal Reaction Kinetics of Janus Spheres
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...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2011-01, Vol.331 (6014), p.199-202 |
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| creator | Chen, Qian Whitmer, Jonathan K Jiang, Shan Bae, Sung Chul Luijten, Erik Granick, Steve |
| description | 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. |
| doi_str_mv | 10.1126/science.1197451 |
| format | Article |
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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.</description><identifier>ISSN: 0036-8075</identifier><identifier>EISSN: 1095-9203</identifier><identifier>DOI: 10.1126/science.1197451</identifier><identifier>PMID: 21233384</identifier><identifier>CODEN: SCIEAS</identifier><language>eng</language><publisher>Washington, DC: American Association for the Advancement of Science</publisher><subject>Anisotropy ; Chemical reactions ; Chemistry ; Colloidal state and disperse state ; Dynamical systems ; Dynamics ; Exact sciences and technology ; Fuses ; General and physical chemistry ; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY ; Isomerization ; Isomers ; Janus ; Kinetics ; Materials science ; Molecular dynamics ; Molecular structure ; Molecules ; Particle interactions ; Physical and chemical studies. Granulometry. 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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.</description><subject>Anisotropy</subject><subject>Chemical reactions</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Dynamical systems</subject><subject>Dynamics</subject><subject>Exact sciences and technology</subject><subject>Fuses</subject><subject>General and physical chemistry</subject><subject>INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY</subject><subject>Isomerization</subject><subject>Isomers</subject><subject>Janus</subject><subject>Kinetics</subject><subject>Materials science</subject><subject>Molecular dynamics</subject><subject>Molecular structure</subject><subject>Molecules</subject><subject>Particle interactions</subject><subject>Physical and chemical studies. 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| ispartof | Science (American Association for the Advancement of Science), 2011-01, Vol.331 (6014), p.199-202 |
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| source | Jstor Complete Legacy; Science Magazine |
| subjects | Anisotropy Chemical reactions Chemistry Colloidal state and disperse state Dynamical systems Dynamics Exact sciences and technology Fuses General and physical chemistry INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY Isomerization Isomers Janus Kinetics Materials science Molecular dynamics Molecular structure Molecules Particle interactions Physical and chemical studies. Granulometry. Electrokinetic phenomena Reaction kinetics Salts Self assembly Spheres |
| title | Supracolloidal Reaction Kinetics of Janus Spheres |
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