Article
Chemistry, Physical
O. Kovalchuk, T. M. Kovalchuk, N. Tomasovicova, M. Timko, K. Zakutanska, D. Miakota, P. Kopcansky, O. F. Shevchuk, Y. Garbovskiy
Summary: Dispersing nanomaterials in liquid crystals can produce advanced materials with multifunctionality and tunability. The electrical and dielectric properties of liquid crystals are influenced by both cell thickness and nanoparticle concentration. The dielectric permittivity can be tuned by changing the nanoparticle concentration, while the electrical conductivity depends on both the cell thickness and nanoparticle concentration.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Jannick Guschlbauer, Leszek Niedzicki, Litwin Jacob, Edyta Rzeszotarska, Damian Pociecha, Piotr Kaszynski
Summary: A new approach to anisotropic liquid electrolytes is explored using a non-ionic liquid crystalline host doped with a lithium salt. The concentration of the ionic additives does not significantly affect the stability of the mesophase, but expands the ion conducting channels. The conductivity and activation energy of the electrolyte vary with temperature and lithium ion concentration.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Gu-Yuan Li, Jia-Jia Yu, Dong-Ming Mo, Maitiniyazi Bake, Ling-Feng Chen, You-Rong Li
Summary: The electro-optical properties of liquid crystals are crucial for liquid crystal displays, and the use of lyotropic liquid chromonic crystals has attracted research interest in various fields. The experimental study revealed that the threshold voltage and relaxation time of nematic lyotropic chromonic liquid crystals decrease with increasing temperature or decreasing concentration. The concentration of neutral ionic dopants like sodium chloride and magnesium sulfate shows a positive correlation while alkaline ionic dopants like sodium hydroxide exhibit a negative correlation with the threshold voltage and relaxation time. The changes in electro-optical properties are analyzed based on the molecular self-assembly behaviors of lyotropic chromonic liquid crystals, and it is discovered that the viscoelastic theory applicable to nematic thermotropic liquid crystals can also be applied to nematic lyotropic chromonic liquid crystals for the first time.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Mechanics
Thomas G. J. Chandler, Saverio E. E. Spagnolie
Summary: This study examines the equilibrium configurations of a nematic liquid crystal with an immersed body in two dimensions. Analytical solutions are found using a complex variables formulation in the case of strong anchoring. Local tractions, forces, and torques on the body are discussed. For weak anchoring strengths, an effective boundary technique is proposed to determine asymptotic solutions. The energy-minimizing locations of topological defects on the body surface are also examined. Various examples, including circular and triangular bodies, and a Janus particle with hybrid anchoring conditions, are provided. Analogies to classical results in fluid dynamics are identified.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Physics, Multidisciplinary
Chau Dao, Jeffrey C. Everts, Miha Ravnik, Yaroslav Tserkovnyak
Summary: Adopting a spintronics-inspired approach, we study the reciprocal coupling between ionic charge currents and nematic texture dynamics in a uniaxial nematic electrolyte. Based on the principle of least dissipation of energy, we derive the adiabatic nematic torque exerted by ionic currents on the nematic director field as well as the reciprocal motive force on ions due to the orientational dynamics of the director. Several simple examples are discussed to illustrate the potential functionality of this coupling. Furthermore, a practical means to extract the coupling strength through impedance measurements on a nematic cell is proposed using our phenomenological framework. Exploring further applications based on this physics could foster the development of nematronics-nematic iontronics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Fluids & Plasmas
P. V. Dolganov, A. S. Zverev, K. D. Baklanova, V. K. Dolganov
Summary: The study revealed that both droplet bridge and outer bridge can exist simultaneously during droplet coalescence, fundamentally changing the coalescence process. This leads to a decrease in outer bridge size, an increase in droplet bridge size, and ultimately the formation of satellite droplets.
Article
Mechanics
Sami C. C. Al-Izzi, Richard G. G. Morris
Summary: In this paper, morphodynamic equations governing the behavior of active nematic fluids on deformable curved surfaces are constructed in the large deformation limit. Objective rates are formulated to account for normal deformations while ensuring that tangential flows are Eulerian, and the surface derivative is used in the nematic free energy to couple local order to out-of-plane bending of the surface. Several illustrative instabilities are characterized by focusing on surface geometry and its dynamical interplay with hydrodynamics.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Multidisciplinary Sciences
Jaka Zaplotnik, Jaka Pisljar, Miha Skarabot, Miha Ravnik
Summary: Supervised machine learning and artificial neural network approaches are used to determine material parameters and structures without knowing the exact mathematical relationship between them. The neural network is trained using simulated relaxation data and transmittance data to accurately predict elastic constants and initial structural material configurations. Furthermore, the neural network can also accurately determine elastic constants from experimentally measured data.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Fluids & Plasmas
Izabela Sliwa, Pavel V. Maslennikov, Alex V. Zakharov
Summary: This article describes the physical mechanism behind the appearance of traveling and nontraveling distortions in a microsized homogeneously aligned nematic film under the effect of a large electric field. Numerical studies reveal that the director's field may experience a traveling distortion wave in response to the electric field, with the rate of distortion depending on the magnitude of the applied field.
Article
Chemistry, Physical
Sylwia Ciastek-Iskrzycka, Jacek Szczytko, Hirosato Monobe, Damian Pociecha, Marcin Jasinski, Piotr Kaszynski
Summary: A series of bent-core paramagnetic ionic liquid crystals containing the N-methylimidazolium group were prepared and their mesogenic, magnetic, and ion conductive properties were investigated. The ion pairs form fluid smectic phases above 100 degrees C, with ion conductivity ranging from 10(-5) to 10(-8) S cm(-1). Magnetic susceptibility measurements revealed liquid-like molecular arrangement in the paramagnetic layers.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Christian Haege, Stefan Jagiella, Frank Giesselmann
Summary: Ionic liquid crystals (ILCs) are soft matter materials with broad liquid crystalline phases and intrinsic electric conductivity. The location of the ionic charge on the rod-like mesogenic ions plays a crucial role in the phase behavior of ILCs.
Article
Physics, Multidisciplinary
Vitaly P. Panov, Jiseon Yang, L. K. Migara, Hyun-Jin Yoon, Jang-Kun Song
Summary: We report on the waveform-induced rotation-time symmetry breaking in liquid crystal director motion and explore its existence in the space of waveform parameters. The possibility of utilizing this system, which exhibits both spatial and temporal long-range order, as a modeling tool for experimental studies on discrete time crystals is discussed.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Jonathan Colen, Ming Han, Rui Zhang, Steven A. Redford, Linnea M. Lemma, Link Morgan, Paul Ruijgrok, Raymond Adkins, Zev Bryant, Zvonimir Dogic, Margaret L. Gardel, Juan J. de Pablo, Vincenzo Vitelli
Summary: The study shows that neural networks can predict the spatiotemporal variations of multiple hydrodynamic parameters and the chaotic dynamics of the system using active nematics; it can forecast the evolution of many-body systems solely from image sequences and machine-learning algorithms inspired by physics outperform deterministic simulations in experimental setups.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Michael A. Stolberg, Benjamin A. Paren, Pablo A. Leon, Christopher M. Brown, Gavin Winter, Kiarash Gordiz, Alberto Concellon, Rafael Gomez-Bombarelli, Yang Shao-Horn, Jeremiah A. Johnson
Summary: Solid polymer electrolytes have the potential to enable safer and more energy-dense batteries. This study investigates the impact of anion dissociation energy on ion conduction in solid polymer electrolytes. The researchers developed ionenes with various cations and found that the addition of a cation-coordinating solvent greatly enhanced ionic conductivity without disrupting the lamellar structure. This work demonstrates that molecular design can facilitate significant improvements in ion conduction in solid polymer electrolytes.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ewan Cruickshank, Rebecca Walker, John M. D. Storey, Corrie T. Imrie
Summary: This article reports the synthesis and characterization of two series of low molar mass liquid crystals in order to investigate the influence of a lateral alkyloxy chain on the formation and stability of ferroelectric nematic phase. The two series differ by the addition of a fluorine substituent. The members of both series exhibit different phase transitions depending on the length of the lateral chain, with a reduction in nematic-isotropic transition temperature and an increase in ferroelectric nematic-nematic or isotropic transition temperature observed as the chain length increases. These findings suggest that the lateral alkyloxy chain adopts specific conformations that affect the mesophase behavior.
Article
Multidisciplinary Sciences
Hiroaki Iino, Takayuki Usui, Jun-ichi Hanna
NATURE COMMUNICATIONS
(2015)
Article
Chemistry, Multidisciplinary
Tengzhou Yang, Hiroaki Iino, Junichi Hanna
Article
Engineering, Electrical & Electronic
Masafumi Kunii, Hiroaki Iino, Jun-Ichi Hanna
IEEE ELECTRON DEVICE LETTERS
(2016)
Article
Chemistry, Multidisciplinary
Teng-Zhou Yang, Hiroaki Iino, Jun-ichi Hanna
Review
Polymer Science
Hiroaki Iino, Jun-ichi Hanna
Article
Chemistry, Multidisciplinary
Hiroaki Iino, Jun-ichi Hanna
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2017)
Article
Chemistry, Physical
Yi-Fei Wang, Hiroaki Iino, Jun-ichi Hanna
Article
Chemistry, Multidisciplinary
Hao Wu, Hiroaki Iino, Jun-ichi Hanna
Article
Chemistry, Multidisciplinary
Hao Wu, Hiroaki Iino, Jun-ichi Hanna
Article
Materials Science, Multidisciplinary
Tengzhou Yang, Fuhua Dai, Hiroaki Iino, Masayuki Kanehara, Xuying Liu, Takeo Minari, Chuan Liu, Junichi Hanna
ORGANIC ELECTRONICS
(2018)
Article
Chemistry, Physical
Finn Schulz, Shun Takamaru, Tobias Bens, Jun-ichi Hanna, Biprajit Sarkar, Sabine Laschat, Hiroaki Iino
Summary: This study synthesized and characterized three novel azulene-thiophene hybrid materials, and prepared uniformly flat films using the liquid crystalline phase. The thin films exhibited high mobilities in organic field effect transistors.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ming-Cong Yang, Jun-ichi Hanna, Hiroaki Iino
JOURNAL OF MATERIALS CHEMISTRY C
(2019)
Article
Physics, Applied
Yi-Fei Wang, Hiroaki Iino, Jun-ichi Hanna
APPLIED PHYSICS LETTERS
(2017)
Article
Physics, Applied
Yi-Fei Wang, Hiroaki Iino, Jun-ichi l Hanna
APPLIED PHYSICS EXPRESS
(2017)
Article
Physics, Applied
M. Kunii, H. Iino, J. Hanna
APPLIED PHYSICS LETTERS
(2017)