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

ZUSAMMENFASSUNG

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.

MATERIALIEN

Produktnummer

Marke

Produktbeschreibung

A3678

Sigma-Aldrich

Ammoniumpersulfat, for molecular biology, suitable for electrophoresis, ≥98%

414565

Sigma-Aldrich

Divinylbenzol, technical grade, 80%

244511

Sigma-Aldrich

Toluol, anhydrous, 99.8%

L5501

Sigma-Aldrich

L-Lysin, ≥98% (TLC)

W292907

Sigma-Aldrich

Isopropylalkohol, ≥99.7%, FCC, FG

779342

Sigma-Aldrich

Glycidylmethacrylat, ≥97.0% (GC)

637106

Sigma-Aldrich

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

I9516

Sigma-Aldrich

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

59304

Sigma-Aldrich

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

278475

Sigma-Aldrich

2-Propanol, anhydrous, 99.5%

310069

Sigma-Aldrich

Eisen(II,III)-oxid, powder, <5 μm, 95%

733458

Sigma-Aldrich

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

R4127

Sigma-Aldrich

Rhodamin 6G, Dye content ~95 %

151238

Sigma-Aldrich

Glycidylmethacrylat, 97%, contains 100 ppm monomethyl ether hydroquinone as inhibitor

62840

Sigma-Aldrich

L-Lysin, crystallized, ≥98.0% (NT)

09913

Sigma-Aldrich

Ammoniumpersulfat, BioUltra, for molecular biology, ≥98.0% (RT)

252433

Sigma-Aldrich

Rhodamin 6G, Dye content 99 %

169099

Sigma-Aldrich

Divinylbenzol, technical grade, 55%

518158

Sigma-Aldrich

Eisen(II,III)-oxid, 99.99% trace metals basis

S4972

Sigma-Aldrich

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

700312

Sigma-Aldrich

Eisenoxid(II,III), magnetische Nanopartikel -Lösung, 10 nm avg. part. size, 5 mg/mL in toluene

83697

Sigma-Aldrich

Rhodamin 6G, suitable for fluorescence, BioReagent

725358

Sigma-Aldrich

Eisenoxid(II,III), magnetische Nanopartikel -Lösung, 10 nm avg. part. size, 5 mg/mL in H₂O

747408

Sigma-Aldrich

Eisenoxid(II,III), magnetische Nanopartikel -Lösung, 30 nm avg. part. size (TEM), PEG functionalized, 1 mg/mL Fe in H₂O, dispersion

725331

Sigma-Aldrich

Eisenoxid(II,III), magnetische Nanopartikel -Lösung, 5 nm avg. part. size, 5 mg/mL in H₂O

747254

Sigma-Aldrich

Eisenoxid(II,III), magnetische Nanopartikel -Lösung, 10 nm avg. part. size (TEM), carboxylic acid functionalized, 5 mg/mL Fe in H₂O, dispersion

747327

Sigma-Aldrich

Eisenoxid(II,III), magnetische Nanopartikel -Lösung, 30 nm avg. part. size (TEM), amine functionalized, 1 mg/mL Fe in H₂O, dispersion

A7460

Sigma-Aldrich

Ammoniumpersulfat, BioXtra, ≥98.0%

725366

Sigma-Aldrich

Eisenoxid(II,III), magnetische Nanopartikel -Lösung, 20 nm avg. part. size, 5 mg/mL in H₂O

700320

Sigma-Aldrich

Eisenoxid(II,III), magnetische Nanopartikel -Lösung, 5 nm avg. part. size, 5 mg/mL in toluene