Solvent-Free Synthesis of Janus Colloidal Particles

Jiang, Shan; Schultz, Mitchell J.; Chen, Qian; Moore, Jeffrey S.; Granick, Steve

doi:10.1021/la800895g

Solvent-Free Synthesis of Janus Colloidal Particles

Journal Article · Thu Aug 21 00:00:00 EDT 2008 · Langmuir

DOI:https://doi.org/10.1021/la800895g· OSTI ID:1876383

Jiang, Shan ^[1]; Schultz, Mitchell J. ^[2]; Chen, Qian ^[2]; Moore, Jeffrey S. ^[2]; Granick, Steve ^[2]

Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois
Univ. of Illinois at Urbana-Champaign, IL (United States)

Taking advantage of the quick and efficient access of vapor to surfaces, a simple, solvent-free method is demonstrated to synthesize Janus colloidal particles in large quantity and with high efficiency. First, at the liquid–liquid interface of emulsified molten wax and water, untreated silica particles adsorb and are frozen in place when the wax solidifies. The exposed surfaces of the immobilized particles are modified chemically by exposure to silane vapor and, in principle, subsequent dissolution of the wax opens up the inner particle surface for further chemical modification. Applying this scheme, this paper describes the production of amphiphilic Janus particles (hydrophobic on one side, hydrophilic on the other) and dipolar Janus particles (positively charged on one side, negatively charged on the other). Janus geometry is confirmed by fluorescence microscopy and flow cytometry. As a result, amphiphilic Janus particles are found to adsorb strongly to the water–oil interface, whereas dipolar particles assemble into chains in the aqueous phase.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-07ER46471

OSTI ID:: 1876383

Journal Information:: Langmuir, Journal Name: Langmuir Journal Issue: 18 Vol. 24; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Oppositely charged twin-head electrospray: a general strategy for building Janus particles with controlled structures Mou, Fangzhi; Chen, Chuanrui; Guan, Jianguo Nanoscale, Vol. 5, Issue 5 https://doi.org/10.1039/c2nr33523a	journal	January 2013
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