Amphiphilic Pickering Emulsifiers Based on Mushroom-Type Janus Particles.

Amphiphilic Pickering Emulsifiers Based on Mushroom-Type Janus Particles.

Langmuir : the ACS journal of surfaces and colloids (2015-07-15)

E Passas-Lagos, F Schüth

RESUMO

Iron-based mushroom-type Janus particles consisting of a poly(sytrene-co-divinylbenzene) and a silica moiety both with controllable morphologies were successfully synthesized on the gram scale and investigated as surfactants for Pickering emulsions. Two oil-water model systems, namely toluene-water and vegetable oil-water, were stabilized, giving mainly water-in-oil (w/o) emulsions. By varying several parameters, including Janus particle morphologies and the oil-water ratio, fine-tuning of the emulsion systems was possible; it was even possible to invert the continuous phase to an oil-in-water (o/w) system. Furthermore, the emulsions were stable against coalescence and sedimentation and could be easily separated by centrifugation or a strong magnet. The synthesized mushroom-type Janus particles are suitable for creating Pickering emulsions and can be used as building blocks for creating nanostructures with tailored properties for specific applications.

MATERIAIS

Número do produto

Marca

Descrição do produto

A3678

Sigma-Aldrich

Persulfato de amônio, for molecular biology, suitable for electrophoresis, ≥98%

414565

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Divinylbenzene, technical grade, 80%

244511

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Tolueno, anhydrous, 99.8%

L5501

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L-lisina, ≥98% (TLC)

W292907

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2-propanol, ≥99.7%, FCC, FG

779342

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Glycidyl methacrylate, ≥97.0% (GC)

637106

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Iron(II,III) oxide, nanopowder, 50-100 nm particle size (SEM), 97% trace metals basis

I9516

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2-propanol, for molecular biology, BioReagent, ≥99.5%

59304

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2-propanol, BioUltra, for molecular biology, ≥99.5% (GC)

278475

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2-propanol, anhydrous, 99.5%

310069

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Iron(II,III) oxide, powder, <5 μm, 95%

733458

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2-propanol, electronic grade, 99.999% trace metals basis

R4127

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Rhodamine 6G, Dye content ~95 %

151238

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Glycidyl methacrylate, 97%, contains 100 ppm monomethyl ether hydroquinone as inhibitor

62840

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L-lisina, crystallized, ≥98.0% (NT)

09913

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Persulfato de amônio, BioUltra, for molecular biology, ≥98.0% (RT)

169099

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Divinylbenzene, technical grade, 55%

518158

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Iron(II,III) oxide, 99.99% trace metals basis

S4972

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Styrene, ReagentPlus^®, contains 4-tert-butylcatechol as stabilizer, ≥99%

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Iron oxide(II,III), magnetic nanoparticles solution, 10 nm avg. part. size, 5 mg/mL in toluene

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A7460

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725366

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Iron oxide(II,III), magnetic nanoparticles solution, 20 nm avg. part. size, 5 mg/mL in H₂O

700320

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700304

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