A5074811661- Advanced Materials and Mechanics
- Liquid Crystal Research Advancements
- Photonic Crystals and Applications
- Transition Metal Oxide Nanomaterials
- Nonlinear Dynamics and Pattern Formation
- Gold and Silver Nanoparticles Synthesis and Applications
- Surface Modification and Superhydrophobicity
- Pickering emulsions and particle stabilization
- Advanced Cellulose Research Studies
- Advanced Sensor and Energy Harvesting Materials
- Enzyme-mediated dye degradation
- Polysaccharides and Plant Cell Walls
- Advanced Battery Technologies Research
- Micro and Nano Robotics
- Structural Analysis and Optimization
- Homotopy and Cohomology in Algebraic Topology
- Vibration Control and Rheological Fluids
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Nanofabrication and Lithography Techniques
- Gas Sensing Nanomaterials and Sensors
- Plasmonic and Surface Plasmon Research
- Advanced Differential Equations and Dynamical Systems
- Electrospun Nanofibers in Biomedical Applications
- Carbon Nanotubes in Composites
University of Cambridge
2018-2021
Johannes Gutenberg University Mainz
2012-2020
University of Applied Sciences Mainz
2013
Martin Luther University Halle-Wittenberg
2011-2013
Plasmonic metasurfaces are a promising route for flat panel display applications due to their full color gamut and high spatial resolution. However, this plasmonic coloration cannot be readily tuned requires expensive lithographic techniques. Here, we present scalable electrically driven color-changing constructed using bottom-up solution process that controls the crucial gaps fills them with an active medium. Electrochromic nanoparticles coated onto metallic mirror, providing smallest-area...
Abstract Hydroxypropyl-cellulose (HPC), a derivative of naturally abundant cellulose, can self-assemble into helical nanostructures that lead to striking colouration from Bragg reflections. The periodicity is very sensitive pressure, rendering HPC responsive photonic material. Recent advances in elucidating these mechano-chromic properties have so-far delivered few real-world applications, which require both up-scaling fabrication and digital translation their colour changes. Here we present...
Cholesteric liquid crystal droplets are self-assembled spherical photonic crystals. Multiple in the same plane communicate optically, giving rise to unique patterns of circularly polarised and strongly coloured spots. We explain phenomenon outline routes application.
We carry out the first study of smectic liquid crystalline colloidal shells and investigate how their complex internal structure depends on director configuration in nematic phase, preceding phase cooling. Differences free energy cost bend splay give an initial skewed distribution topological defects phase. In geometrical constraints spherical shell imposed developing 1D quasi-long-range order create a conflict that triggers series buckling instabilities. Two different characteristic defect...
The development of better Li-ion battery (LIB) electrodes requires an orchestrated effort to improve the active materials as well electron and ion transport in electrode. In this paper, iron silicide is studied anode material for LIBs because its higher conductivity lower volume expansion compared pure Si particles. addition, carbon nanotubes (CNTs) can be synthesized from surface iron-silicides using a continuous flow coating process where precursors are first spray dried into...
We produce and investigate liquid crystal shells with hybrid alignment—planar at one boundary, homeotropic the other—undergoing a transition between nematic (N) smectic-A (SmA) phases. The display dynamic sequence of patterns, details depending on alignment agents diameter thickness shell. In sufficient we typically find transient striped texture near N–SmA transition, stabilising into pattern tiled, more or less regularly spaced focal conic domains in SmA phase. domain size spacing decrease...
Thin liquid crystalline shells surrounding and surrounded by aqueous phases can be conveniently produced using a nested capillary microfluidic system, as was first demonstrated Fernandez-Nieves et al. in 2007. By choosing particular combinations of stabilizers the internal external phases, different types alignment, uniform or hybrid, ensured within shell. Here, we investigate nematic smectic under varying boundary conditions, focusing on textural transformations during phase transitions,...
When an orientationally ordered system, like a nematic liquid crystal (LC), is confined on self-closing spherical shell, topological constraints arise with intriguing consequences that depend critically how the LC aligned in shell. We demonstrate reversible dynamic tuning of alignment, and thereby topology, shells stabilized by nonionic amphiphilic block copolymer Pluronic F127. Deep phase, director (the average molecule orientation) tangential to interface, but upon approaching temperature...
Abstract Plasmonic metafilms have been widely utilized to generate vivid colors, but making them both active and flexible simultaneously remains a great challenge. Here plasmonic constructed by printing electrochromic nanoparticles onto ultrathin metal films (<15 nm) are presented, offering low‐power electricallydriven color switching. In conjunction with commercially available techniques, such devices can be patterned using lithography‐free approaches, opening up potential for...
We describe two new techniques of preparing liquid crystal samples and discuss their potential for novel research applications. Very thin polymer composite fibers functionalized by a crystalline core are realized coaxial electrospinning solution surrounding the during spinning process. The resulting fiber mats exhibit special properties responsiveness core, e.g. temperature dependent selective reflection when short-pitch cholesteric is encapsulated. In second approach an axisymmetric nested...
<title>Abstract</title> This work aims to compare the capability of vibration attenuation by standard elastomeric polymers, and new anomalously damping nematic liquid crystal elastomers. We use most mainstream materials in both categories, design two testing platforms: ASTM-standard constrained layer plate resonance geometry, resonances a commercial device (electric drill) where polymers were inserted into casing. In testing, we find that LCE outperforms all materials, moreover, it brings...
We present here the successful preparation of liquid crystalline core-shell elastomers via a microfluidic double-emulsion process. The customized set-up allows for temperature-controlled fabrication particles from thermoresponsive mesogenic monomer. nematic shell is filled with non-mesogenic core silicone oil. To verify structure optical microscopy, we prepared colored using red dye. were also able to micro-manipulate and penetrate them small glass capillary extract core.
Abstract Review: 33 refs.
When a nematic liquid crystal (LC) is confined on self-closing spherical shell, topological constraints arise with intriguing consequences that depend critically how the LC aligned in shell. We demonstrate reversible dynamic tuning of alignment, and thereby topology, shells stabilized by nonionic amphiphilic block copolymer Pluronic F127. Deep phase, director tangential to interface, but upon approaching temperature TNI nematic-isotropic transition, realigns normal. link this delicate...