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Showing 1 to 20 of 24 for “"Janus particles"”.
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Janus Particles at Interfaces
… characterization of both polymeric and hybrid Janus particles of well-defined size, shape and functionality and their high potential for applications in colloidal and material science. Soft Janus particles, based on polystyrene-block-polybutadiene-block-poly(methyl methacrylate) (SBM) triblock …
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Synthesis and self-assembly of multiblock and Janus particles
… first, the fabrication of patchy colloidal particles on demand, second, the observation and analysis of their self-assembly kinetics. For the second part, we focus on three intertwining topics: phase diagram construction, kinetic pathway selection and external force modulation. A mixture of …
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Soft Compartmentalized Polymer Colloids: Janus Particles, Multicompartment Structures, Inorganic-Organic Hybrids and Applications
… and a high shape-persistence of the colloidal particles even when exposed to non-selective solvents. Cylindrical and disc-like Janus particles were investigated according to their self-assembly behavior into superstructures. The Janus discs undergo back-to-back stacking in organic solvent. In …
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Janus Particles at the Air-Water Interface: Single particle behavior, particle-laden interfaces, and implications for self-assembly
… have allowed for the synthesis of anisotropic Janus particles with precise control of the wetting properties on each hemisphere. Interfacial assembly of Janus particles is of particular interest as the anisotropy and amphiphilicity of these particles can be tuned in order to drive self-assembly …
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Motion of Janus and Patchy Particles Near Various Boundaries
<p>Colloidal particles with anisotropic surface properties are an emergent class of novel materials that have been indicated to possess a remarkable potential to still be fully exploited. Among anisotropic colloids, Janus and patchy particles with different compositions and functionalities recently …
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Designing Particle Tracking Software for a Theoretical Understanding of Magnetic Janus Particle Aggregation
<p>Magnetic Janus particles are spherical colloids covered with a thin magnetic cap on one half of their surface. The asymmetric magnetic material gives the particles a magnetic dipole shifted away from the center of mass of the particle. The magnetic dipole either points perpendicular …
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Wettability of solid particles in relation to particle-stabilised foams and emulsions
Colloidal particles and surfactants are commonly used, either individually or combined, as stabilisers of emulsions and foams. While the properties of surfactants and particles under a range of conditions and concentrations are relatively well known, there are some areas that require further …
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Colloidal structures with novel functions
… stimuli - responsive hydrogels and Janus particles. Optical textures changes produced by adsorption of a range of surfactants at the LC-water interface have been investigated using polarised and fluorescence microscopy to develop a novel sensor to detect various interfacial phenomena …
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Stop-flow lithography and its application to graphical encoding
… technique, geometrically anisotropic colloid particles are generated at high throughput (~106 particles/h). Fabrication of functional materials such as hydrogel and shape memory polymer is proven compatible. All candidate materials can be combined to form chemically anisotropic colloid …
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Phase separation in thermally-drawn fibers: From porous domains to structured Si-Ge spheres
… separation" of the alloy, leading to structured Janus particles.
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Collective behavior of driven Janus colloids in external fields
Colloids are micron-sized particles widely used in industrial processes and everyday products. Conventional interest has focused on their equilibrium self-assembly structures by engineering static interactions between the colloids. The introduction of the fourth dimension, time, gives rise to a new …
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Induced-charge electrokinetics at large voltages
… puzzles include strange behavior of colloidal particles, high-frequency flow reversal in microfluidic ACEO pumps, and concentration dependence of electrokinetic slip. Theoretical developments would help not only in exploiting poorly understood effects favorably, but also in building more …
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Non-equilibrium self-assembly processes of complex dipolar colloids
… aggregation. In the case of lane formation it is Janus particles in AC electric fields which are considered. These particles form either chain-like aggregates or yield a self-propulsion mechanism, depending on the field frequency. The investigation of an explicitly dipolar model shows chain …
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Preparation of anisotropic microparticles and their behaviour at liquid interfaces
Monolayers of solid particles at the liquid- fluid interface are of considerable interest in both academia and industry. Their behaviour during compression and expansion experiments in a Langmuir trough has important implications on particle stabilisation of foams and emulsions. This has been known …
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Bottom-up Self-Assembly across Hierarchies: From Triblock Terpolymers to Patchy Particles to Colloidal (Co-)Polymers
… the bottom-up self-assembly of compartmentalized particles on multiple hierarchies was investigated. ABC triblock terpolymers were directed as basic build-ing blocks into nano-scale corona-compartmentalized (patchy) particles via selection of kinetic self-assembly pathways. An extremely efficient …
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Synthesis, characterization and assembly of the binary ligand protected gold nanoparticles
… mismatch of two ligands, and the sizes of nanoparticles. When the size of the gold core is approximately between 3-8 nm, the stripe-like ordered domains of two ligands are formed. The stripe-like structure is not favored when you consider only the enthalpy. However, the long ligands obtain …
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Biomedical applications of nanostructured polymer films
… of materials control the function of polymeric particles in vitro and in vivo. One example is a 'Cellular Backpack' which is a flat, anisotropic, stratified polymeric particle that is hundreds of nanometers thick and microns wide. In partnership with the Mitragotri group at UCSB, we show that …
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Hybrids Based on Layered Silicates
Novel hybrid nanoparticles were synthesized based on combinations of various layered silicates as inorganic core and well-defined polymer chains as a shell. In all cases positively charged 2-(dimethylamino)ethyl methacrylate (DMAEMA) was incorporated into the polymeric structure to serve as a firm …
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Magnetic Manipulation and Assembly of Multi-component Particle Suspensions
… the assembly of magnetic and nonmagnetic particles either in bulk fluid or near a substrate. Both uniform glass interfaces and substrates with magnetic microstructures are considered. The main goal of this work is to discuss new strategies for implementing magnetic assembly systems that …
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Shape and chemically anisotropic colloidal particles: A theoretical study of their structure, phase behavior, and slow dynamics
… volume fraction of quasi 1- and 2- dimensional particles fall monotonically with the number of sites (aspect ratio), while 3-dimensional particles display a non-monotonic dependence of glassy vitrification on the number of sites. Introducing interparticle attractions results in a far more …
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