A5071087989- Liquid Crystal Research Advancements
- Optical Polarization and Ellipsometry
- Molecular spectroscopy and chirality
- Micro and Nano Robotics
- Advanced Materials and Mechanics
- Nonlinear Dynamics and Pattern Formation
- Microfluidic and Bio-sensing Technologies
- Adhesion, Friction, and Surface Interactions
- Molecular Communication and Nanonetworks
- Plant and animal studies
- Plant Reproductive Biology
- Scientific Computing and Data Management
- Pickering emulsions and particle stabilization
- Pigment Synthesis and Properties
- Advanced Thermodynamics and Statistical Mechanics
- Spectroscopy and Quantum Chemical Studies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Surface Modification and Superhydrophobicity
- Characterization and Applications of Magnetic Nanoparticles
- Protist diversity and phylogeny
- Textile materials and evaluations
- Photonic Crystals and Applications
- Microbial Community Ecology and Physiology
- Algal biology and biofuel production
Max Planck Institute for Dynamics and Self-Organization
2016-2021
Otto-von-Guericke University Magdeburg
2012-2016
Institute of Experimental Physics of the Slovak Academy of Sciences
2014
University Hospital Magdeburg
2014
Kent State University
2008-2013
Using a magnetic Frederiks transition technique, we measure the temperature and concentration dependences of splay K1, twist K2, bend K3 elastic constants for lyotropic chromonic liquid crystal sunset yellow formed through noncovalent reversible aggregation organic molecules in water. K1 are comparable to each other an order magnitude higher than K2. At concentrations lower temperatures, ratios K1/K3 K1/K2 increase, which is attributed elongation self-assembled aggregates, feature not found...
Microorganisms, such as bacteria and microalgae, often live in habitats consisting of a liquid phase plethora interfaces. The precise ways which these motile microbes behave their confined environment remain unclear. Using experiments Brownian dynamics simulations, we study the motility single Chlamydomonas microalga an isolated microhabitat with controlled geometric properties. We demonstrate how geometry habitat controls cell's navigation confinement. probability finding cell swimming near...
We report on measurements of magnetic-field induced nematic order in the bent-core liquid crystal 4-chlororesorcinol bis[4-(4-$n$-dodecyloxybenzoyloxy) benzoate]. Using 31 T solenoid at National High Magnetic Field Laboratory, we have observed, temperatures less than 1\ifmmode^\circ\else\textdegree\fi{} above clearing point, a first-order transition to phase. The critical magnetic field which this occurs increases with temperature. discuss these results within context both Maier-Saupe and...
When the motion of a motile cell is observed closely, it appears erratic, and yet combination nonequilibrium forces surfaces can produce striking examples organization in microbial systems. While most our current understanding based on bulk systems or idealized geometries, remains elusive how at which length scale self-organization emerges complex geometries. Here, using experiments analytical numerical calculations, we study cells under controlled microfluidic conditions demonstrate that...
The existence of the elusive biaxial phase has been subject much discussion since it was predicted by Freiser in 1970. More recently, there have numerous attempts to find a thermotropic liquid crystal that exhibits and with this, conflicting reports about whether such positively identified bent-core crystals. One reason for discrepancy is currently no way rule out surface effects or anchoring transitions, both which may give false positive identification uniaxial-biaxial nematic transition....
We report results on the high-field magneto-optical response of four aqueous, lyotropic, chromonic liquid crystal formulations in isotropic phase. Measurements field-induced birefringence at temperatures above isotropic-nematic coexistence region high magnetic fields reveal qualitative differences different materials; these can be attributed to nature aggregation and are discussed within context competing models. Extending measurements very large optical phase reveals presence an unexpected...
The formation of flexoelectric stripe patterns (flexodomains) was studied under the influence external electric and magnetic fields in a nematic liquid crystal. critical voltage wavevector flexodomains were investigated different geometries by both experiments simulations. It is demonstrated that upon altering orientation field with respect to director, wavenumber behave substantially differently. In geometry twist Freedericksz transition, non-monotonic behavior as function found.
The recoil process of free-standing liquid crystal filaments is investigated experimentally and theoretically. We focus on two aspects, the contraction speed filament a spontaneously formed undulation instability. At moment rupture, buckle similarly to classical Euler buckling elastic rods. tip velocity decays with decreasing length. wavelength affinely decreases retracting tip. energy gain related decrease total length surface area mainly dissipated by layer rearrangements during thickening...
We investigate the stability and structure of freely suspended filaments columnar liquid crystal phases. In hexagonal phase, with aspect ratios order 20:1 more can be formed. They cooled into a low-temperature body-centred orthorhombic phase without breaking. The slow optic axis is perpendicular to filament materials are negatively birefringent in high-temperature phase. At transition sign birefringence inverted. Within lifetime filaments, three regimes distinguished. First, thin...
We report on a series of measurements the microscopic structure and magneto-optical properties calamitic liquid crystalline compound in its nematic phase. Structural studies show existence short-range, tilted smectic order consistent with pretransitional effects above an underlying Concomitantly, results exhibit optic axis not collinear uniaxial director. This apparent biaxial nature is discussed within context coupling between tensor parameters.
We demonstrate an unusually strong magneto-optical response of elongated plate-shaped pigment particles in magnetic fields ranging from 0 to 25 T.
AbstractWe present results on the effect of extension and compression liquid crystal filaments formed in B7 phase bent-core mesogens. There are three distinct temperature regimes which substantially different structures may form along filament. The formation these also depends velocity at filament is extended or compressed.
Correction for ‘Peculiarities of the magneto-optical response in dispersions anisometric pigment nano-particles’ by A. Eremin <italic>et al.</italic>, <italic>RSC Adv.</italic>, 2016, <bold>6</bold>, 80666–80669.