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Asymmetrical Janus Particles and symmetrical “Core-Shell” Colloids

Dr. Alla Synytska

Abstract:
Over the last decade there have been immense efforts to fabricate monolith and core-shell colloidal materials with tailored structural, optical, and surface properties. The “core-shell” concept is particularly interesting and provides a variety of opportunities to change properties of colloidal particles. The “core-shell” concept typically implies tailoring the surface properties of particles, often accomplished by coating or encapsulating them within a shell of a preferred material.

There are plenty of methods for modification of particles by using of different surfactants, silanes and polymers. Most of conventional methods allow uniform or homogenous coating of the particles. On the other hand, one can expect interesting properties from the asymmetrically coated particles i.e. the particles whose surface chemical composition differs on two sides. These particles are often called “Janus” particles and were suggested by de Genne for the first time. 

Janus particles (JPs) i.e. the colloidal particles having different properties (such as charge, polarity, optical and magnetic properties) at opposite sides are an example of synthetic asymmetrical systems. Due to anisotropy of properties, the JPs are unique among other micro- and nanoparticles. Recently, the JPs demonstrated huge potential as drug-carriers, emulsion stabilizers, micro rheological probes and functional elements for design of electronic paper. Moreover, due to asymmetrical structures, the JPs are able to aggregate into fascinating hierarchical structures, thereby, building blocks for complex superstructures.

Publications on Topic

  1. Synytska, A.; Ionov, L.; Grundke, K.; Stamm, M.
    Wetting on fractal superhydrophobic surfaces from "core-shell" particles : A comparison of theory and experiment more
    Langmuir 25 (2009) 3132-3136

  2. Berger, S.; Synytska, A.; Ionov, L.; Eichhorn, K.-J.; Stamm, M.
    Stimuli-responsive bicomponent polymer janus particles by "grafting from"/"grafting to" approaches more
    Macromolecules 41 (2008) 9669-9676

  3. Synytska, A.; Ionov, L.; Dutschk, V.; Stamm, M.; Grundke, K.
    Wetting on regularly structured surfaces from "Core-Shell" particles: Theoretical predictions and experimental findings more
    Langmuir 24 (2008) 11895-11901

  4. Dominguez-Espinosa, G.; Synytska, A.; Drechsler, A.; Gutsche, C.; Kegler, K.; Uhlmann, P.; Stamm, M.; Kremer, F.
    Optical tweezers to measure the interaction between poly(acrylic acid) brushes more
    Polymer 49 (2008) 4802-4807

  5. Synytska, A.; Stamm, M.; Grundke, K.
    Irregular fractal assemblies from 'Core-shell' particles - a way to design ultrahydrophobic surfaces more
    Polymeric Materials: Science and Engineering 51 (2006) 194-195

  6. Synytska, A.; Ionov, L.; Dutschk, V.; Minko, S.; Eichhorn, K.-J.; Stamm, M.; Grundke, K.
    Regular Patterned Surfaces from Core-Shell Particles. Preparation and Characterization more
    Progress in Colloid and Polymer Science (2006) 72-81

  7. Synytska, A.; Ionov, L.; Minko, S.; Motornov, M.; Eichhorn, K.-J.; Stamm, M.; Grundke, K.
    Tuning Wettability by Controlled Roughness and Surface Modification Using Core-Shell Particles more
    Polymeric Materials: Science and Engineering 90 (2004) 624-625

 
Asymmetrical Janus Particles and symmetrical “Core-Shell” Colloids
Asymmetrical Janus Particles and symmetrical “Core-Shell” Colloids

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Polymer Interfaces

Fields of Work