Formation of Anisometric Fumed Silica Supraparticles – Mechanism and Application Potential
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Marcel Sperling
Abstract
The self-assembly of colloidal particles into well-defined structures, such as anisometric ones, has shown to be both a challenging and promising field in today's research. We report a detailed analysis of the processes of drying and the associated colloidal assembly-induced deformation of aqueous droplets containing fumed silica (FS) on a superhydrophobic surface. The use of FS as colloidal building block can lead to the formation of anisometric supraparticles by droplet deformation due to the formation of a dense silica shell at the water-air interface. We demonstrate how this can be done in a controlled way by adjusting the initial suspension's ionic strength using NaCl. An interpretation of the critical deformation point is given and we derive an empirical formula to predict the extent of anisometry depending on the initially applied salt and FS concentration. By addition of polystyrene microspheres we prove the general applicability of this method to droplets containing dispersions of various types of colloidal material, thereby forming hybrid supraparticles. This allows for introducing additional functionality to anisometric particles prepared with FS.
Acknowledgement
We are grateful for the financial support of this study from the Deutsche Forschungsgemeinschaft (DFG) in the framework of IGRTG-1524 and in the form of Mercator Professorship for O.V. (DFG INST131/582-1). We also acknowledge support from the US-NSF through the Triangle MRSEC on Programmable Soft Matter (DMR-1121107). We thank as well the DAAD for funding the exchange between North Carolina State University and Technische Universität Berlin via the PPP-program (Projektkennziffer: 57052141). For performing SEM measurements we gratefully acknowledge Dipl. Phys. Christoph Fahrenson and the ZELMI at Technische Universität Berlin.
©2015 Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Preface
- Gerhard Findenegg: A Scientific Life in Soft Matter at Interfaces
- Nanoparticles via Oil-in-Water Microemulsions: a Solvent-Reduced, Energy-Efficient Approach
- Formation of Anisometric Fumed Silica Supraparticles – Mechanism and Application Potential
- Multidirectional, Multicomponent Electric Field Driven Assembly of Complex Colloidal Chains
- Polymer Brush/Metal Nanoparticle Hybrids for Optical Sensor Applications: from Self-Assembly to Tailored Functions and Nanoengineering
- Poly-acrylic Acid Brushes and Adsorbed Proteins
- Interactions of Two Fragments of the Human Antimicrobial Peptide LL-37 with Zwitterionic and Anionic Lipid Monolayers
- Depletion Interaction Mediated by fd-Virus: on the Limit of Low Density and Derjaguin Approximation
- Transport Properties of Polyelectrolyte Solutions. Effect of Confinement in Thin Liquid Films
- Relationship Between Pore Structure and Sorption-Induced Deformation in Hierarchical Silica-Based Monoliths
- Ammonia Dissociation on Graphene Oxide: An Ab Initio Density Functional Theory Calculation
- Responsive Microgels at Surfaces and Interfaces
- Buckled Topography to Enhance Light Absorption in Thin Film Organic Photovoltaics Comprising CuPc/C60 Bilayer Laminates
Artikel in diesem Heft
- Frontmatter
- Preface
- Gerhard Findenegg: A Scientific Life in Soft Matter at Interfaces
- Nanoparticles via Oil-in-Water Microemulsions: a Solvent-Reduced, Energy-Efficient Approach
- Formation of Anisometric Fumed Silica Supraparticles – Mechanism and Application Potential
- Multidirectional, Multicomponent Electric Field Driven Assembly of Complex Colloidal Chains
- Polymer Brush/Metal Nanoparticle Hybrids for Optical Sensor Applications: from Self-Assembly to Tailored Functions and Nanoengineering
- Poly-acrylic Acid Brushes and Adsorbed Proteins
- Interactions of Two Fragments of the Human Antimicrobial Peptide LL-37 with Zwitterionic and Anionic Lipid Monolayers
- Depletion Interaction Mediated by fd-Virus: on the Limit of Low Density and Derjaguin Approximation
- Transport Properties of Polyelectrolyte Solutions. Effect of Confinement in Thin Liquid Films
- Relationship Between Pore Structure and Sorption-Induced Deformation in Hierarchical Silica-Based Monoliths
- Ammonia Dissociation on Graphene Oxide: An Ab Initio Density Functional Theory Calculation
- Responsive Microgels at Surfaces and Interfaces
- Buckled Topography to Enhance Light Absorption in Thin Film Organic Photovoltaics Comprising CuPc/C60 Bilayer Laminates
