Solvent-Free Synthesis of Janus Colloidal Particles

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

doi:10.1021/la800895g

Title: 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. ^[1]; Chen, Qian ^[1]; Moore, Jeffrey S. ^[1]; Granick, Steve ^[1]

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.

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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, Vol. 24, Issue 18; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Janus Particles with Controllable Patchiness and Their Chemical Functionalization and Supramolecular Assembly Ling, Xing Yi; Phang, In Yee; Acikgoz, Canet Angewandte Chemie, Vol. 121, Issue 41 https://doi.org/10.1002/ange.200903579	journal	September 2009
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Fabrication of 3D wax/silica/Ag(Au) colloidosomes as surface-enhanced Raman spectroscopy substrates based on Pickering emulsion and seed-mediated growth method of noble metal nanoparticles Wang, Ke; Feng, Lihua; Li, Xiyong Journal of Materials Research, Vol. 34, Issue 12 https://doi.org/10.1557/jmr.2019.116	journal	April 2019
Janus particles for biological imaging and sensing Yi, Yi; Sanchez, Lucero; Gao, Yuan The Analyst, Vol. 141, Issue 12 https://doi.org/10.1039/c6an00325g	journal	January 2016
Inorganic Janus particles for biomedical applications Schick, Isabel; Lorenz, Steffen; Gehrig, Dominik Beilstein Journal of Nanotechnology, Vol. 5 https://doi.org/10.3762/bjnano.5.244	journal	December 2014
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Colloidal Synthesis of Gold Semishells Rodríguez-Fernández, Denis; Pérez-Juste, Jorge; Pastoriza-Santos, Isabel ChemistryOpen, Vol. 1, Issue 2 https://doi.org/10.1002/open.201200002	journal	March 2012

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Title: Solvent-Free Synthesis of Janus Colloidal Particles

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