Article
Chemistry, Physical
Kelum Perera, Rony Saha, Pawan Nepal, Rohan Dharmarathna, Md Sakhawat Hossain, Md Mostafa, Alex Adaka, Ronan Waroquet, Robert J. Twieg, Antal Jakli
Summary: The experimental results and theoretical considerations of novel electromechanical effects of ferroelectric nematic liquid crystal droplets coexisting with the isotropic melt are presented in this study. It is found that the droplets have flat pancake-like shapes thinner than the sample thickness. A wing-shaped defect with low birefringence is present in the center of the droplets, moving perpendicular to a weak electric field, and dividing into two at higher fields. The entire droplet drifts along the electric field with a speed independent of droplet size and proportional to the electric field amplitude.
Article
Multidisciplinary Sciences
Raouf Barboza, Stefano Marni, Fabrizio Ciciulla, Farooq Ali Mir, Giovanni Nava, Federico Caimi, Annamaria Zaltron, Noel A. Clark, Tommaso Bellini, Liana Lucchetti
Summary: In this study, we investigated the electrostatic behavior of ferroelectric liquid droplets on a lithium niobate ferroelectric crystal substrate. The droplets exhibit explosive emission of fluid jets upon entering the ferroelectric phase, mostly at the interface, which eventually form secondary droplets.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Jidan Yang, Yu Zou, Wentao Tang, Jinxing Li, Mingjun Huang, Satoshi Aya
Summary: The authors report the discovery of chiral polarization meron-like structures in the emergence of quasi-2D ferroelectric nematic domains. The polarization strength plays a crucial role in determining polarization topology.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Fluids & Plasmas
Marcell Tibor Mathe, Agnes Buka, Antal Jakli, Peter Salamon
Summary: A thermal gradient-induced circular motion of particles placed on ferroelectric nematic liquid crystal sessile drops is shown and explained in this study. The experiments demonstrate the unique properties of fluid ferroelectric liquid crystals, where the laminar flow drives the rotation of particles and gives them electric charge.
Article
Multidisciplinary Sciences
Xi Chen, Vikina Martinez, Pierre Nacke, Eva Korblova, Atsutaka Manabe, Melanie Klasen-Memmer, Guillaume Freychet, Mikhail Zhernenkov, Matthew A. Glaser, Leo Radzihovsky, Joseph E. Maclennan, David M. Walba, Matthias Bremer, Frank Giesselmann, Noel A. Clark
Summary: The observation of smectic AF phase in liquid crystals, which is characterized by polar, rod-shaped molecules forming layered structures and exhibiting ferroelectric properties, is reported. Two different phase sequences have been observed in binary mixtures of partially fluorinated mesogens.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Biochemistry & Molecular Biology
Jordan D. Herod, Duncan W. Bruce
Summary: The study examines families of symmetric, ionic, tetracatenar mesogens based on a rigid N-phenylpyridinium core, prepared with various terminal chain lengths for different salts. Different families exhibit distinct phase transition behaviors, such as SmA phase, Col(h) phase, and intermediate cubic phase.
Article
Multidisciplinary Sciences
Per Rudquist
Summary: The recent discovery of spontaneously polar nematic liquid crystals, known as ferroelectric nematics, has attracted significant interest. So far, experimental verification of this phase has been challenging. A direct method for experimental verification has been proposed, utilizing a single sample cell and observing the orientation of disclination lines to reveal the ferroelectric nematic phase.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Chinmay Chandan Parhi, Avanish Babu Thirumalasetty, Ajit Raymond James, Madhuri Wuppulluri
Summary: The escalating demand for energy-related devices has led to an intensive study on materials for energy harvesting and storage. This research compares the energy-storage capacity of two different materials and analyzes their structural, optical, electrical, ferroelectric, and energy storage properties. The findings suggest that both materials have distinct characteristics and potential applications.
Article
Engineering, Mechanical
M. D. Aviles, R. Pamies, J. Sanes, J. Arias-Pardilla, F. J. Carrion, M. D. Bermudez
Summary: The addition of Bis(2-hydroxyethyl) ammonium stearate (DES) protic ionic liquid crystal (PILC) to di-bis(2-hydroxyethyl) ammonium succinate (DSU) protic ionic liquid (PIL) lubricant blends significantly reduces friction coefficient and wear rate, while also preventing surface damage. Surface analysis using various techniques showed positive results after tribological tests.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Electrochemistry
Manish S. Sengar, Sachin Saxena, Soami P. Satsangee, Rajeev Jain
Summary: This paper discusses the synthesis and application of graphene oxide (GO)/1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF4] nanocomposite. The nanocomposite exhibits remarkable interfacial properties on the electrode surface, leading to enhanced detection and quantification capabilities for Embramine.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Prabir K. Mukherjee
Summary: The effects of ferroelectric nanoparticles on the SmA-SmC* phase transition were studied theoretically, showing a qualitative agreement between experimental and theoretical results.
Article
Materials Science, Multidisciplinary
Junchen Zhou, Runli Xia, Mingjun Huang, Satoshi Aya
Summary: This research focuses on the molecular geometry effects on the phase behavior of ferroelectric nematics. By synthesizing pure stereoisomers, it was discovered that the phase diagram of the material is strongly dependent on the mixing ratio. The results suggest that the ferroelectric nematic phase can be stabilized at room temperature with appropriate compositions.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Ayesha Sultana, Md. Mehebub Alam, Simone Fabiano, Xavier Crispin, Dan Zhao
Summary: Increasing the ferroelectric phase content in a polymer matrix can enhance the molar ionic conductivity of incorporated ionic liquid significantly. Ferroelectric polymer fiber mats were prepared to induce the ferroelectric phase and ensure the polarization of dipoles, leading to improved conductivity. An organic ionic thermistor was fabricated using these fiber mats, demonstrating temperature tracking and mapping functions.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Prabir K. Mukherjee
Summary: The properties of ferroelectric liquid crystal (FLC) in the mixtures of FLC and quantum dots have been studied using Flory-Huggins theory and Landau theory. The results show that the pitch length, spontaneous polarisation, and tilt angle in the chiral smectic-C* phase of the FLC system increase with the concentrations of quantum dots. A qualitative comparison between the theoretical and experimental results is discussed.
Article
Chemistry, Applied
Yunmei Wu, Hui Tan, Liangbin Lin, Hongyu Guo, Fafu Yang
Summary: In this study, Gemini-type fluorescence ionic liquid crystals (ILCs) were prepared and investigated. These ILCs emitted strong fluorescence in aggregated states and exhibited reversible smectic mesophase. The stable gels formed in DMSO-toluene system showed excellent thermal reversible response. The novel ILCs with C6H13 chains presented orderly rectangular columnar stacking in the gel phase.
Article
Chemistry, Physical
Depanshu Varshney, Ariba Parveen, Jai Prakash
Summary: In this study, the influence of newly synthesized cobalt oxide nanoparticles on the dielectric and optical properties of liquid crystal materials was investigated. Dielectric spectroscopic measurements and optical microscopy were used to study the dielectric parameters and alignment of the liquid crystal material in the presence of the nanoparticles. The doping of these nanoparticles has significant potential for research and industrial applications.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Sidra Khan, Jai Prakash, Shikha Chauhan, Amit Choudhary, Ashok M. Biradar
Summary: Dielectric spectroscopy is used to investigate the behavior of bulk mode and surface phenomenon in surface stabilized liquid crystal samples. The study reveals the significant influence of surface effect on the characteristics of GM phenomenon, as well as the presence of two molecular dynamics and mode transitions at different temperatures.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Review
Materials Science, Multidisciplinary
P. Priscilla, Praveen Malik, Supreet, Ajay Kumar, Riccardo Castagna, Gautam Singh
Summary: This review focuses on the alignment of liquid crystals (LCs) controlled by nanoparticles. It is found that doping nanoparticles in LCs or patterning nanostructures on substrates can achieve the desired alignment of LCs. Using nanoparticles for LC alignment has similar quality to conventional alignment techniques, but it is less time consuming and cost-effective. Furthermore, nanoparticles can greatly improve the electro-optical properties of LC devices.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2023)
Article
Chemistry, Physical
Depanshu Varshney, Anu, Jai Prakash, Vinay Pratap Singh, Kamlesh Yadav, Gautam Singh
Summary: This study reports on the concentration and temperature dependent optical, electro-optical, and dielectric properties of a bismuth titanate nanocomposite doped with a nematic liquid crystal. The results show that the nanocomposite is uniformly dispersed in the liquid crystal without agglomeration, and it significantly affects the dielectric properties and optical memory of the liquid crystal. These findings have important implications for the development of wearable devices and smart switchable windows.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Physics, Applied
Ajay Kumar, Dharmendra Pratap Singh, Gautam Singh
Summary: The integration of liquid crystals and nanotechnology has brought new features to liquid crystal materials, and carbon-based nanomaterials have shown synergistic interaction with liquid crystals. However, achieving uniform dispersion of carbon-based nanomaterials in liquid crystal matrix is a challenging step in the preparation of carbon-based nanomaterial/liquid crystal composites.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Review
Physics, Condensed Matter
Ajay Kumar, Priyam, Harikesh Meena, Jai Prakash, Ling Wang, Gautam Singh
Summary: Ferroelectric liquid crystals (FLCs) have excellent electro-optical properties compared to nematic liquid crystals (LCs), and the dispersion of nanomaterials (NMs) in FLCs can further improve their electro-optical properties. Semiconducting nanomaterials (SNMs), in particular, have shown great potential in enhancing molecular alignment, dielectric behavior, memory effect, switching response, and photoluminescence in FLCs.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Ariba Parveen, Ajeet K. Kaushik, Jai Prakash
Summary: The study presents a novel liquid crystal-based biosensor for detecting histamine levels, utilizing the orientational transition of a nematic liquid crystal by enzymatic reaction. The biosensor provides a good optical and dielectric response with a detection limit ranging from 20 mg/L to 500 mg/L.
Article
Chemistry, Physical
Ariba Parveen, Jai Prakash, Gautam Singh
Summary: The impact of ferroelectric nanoparticles (FNPs), specifically strontium titanate (SrTiO3), on the dielectric, electro-optical, and electrical response of a room temperature liquid crystal (NLC), 5CB, has been investigated. The results show that the low frequency dielectric relaxation shifts towards higher frequency with increasing concentration of FNPs, but decreases to even lower than the pure sample at approximately 2 wt% concentration. The short axis molecular relaxation observed in a homeotropic cell shifts towards higher frequency by approximately 28% in the composites, independent of concentration. Furthermore, the dielectric spectra in the composites do not return to their original state even after approximately 22 minutes, indicating an apparent dielectric memory effect. The voltage dependent optical textures confirm the short term memory in the composites. The electrical response of the composites is also significantly different from the pure sample, further confirming the impact of FNPs on NLC.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Depanshu Varshney, Jai Prakash, Gautam Singh
Summary: This article investigates the alignment of liquid crystal (LC) molecules on the desired substrate using the noncontact-based technique. The study demonstrates the achievement of various alignment modes (homogeneous and homeotropic) by dispersing indium tin oxide (ITO) nanoparticles (0.25 wt% and 1 wt%) in an ITO sample cell without an alignment layer. The tunability in alignment is attributed to the interaction between ITO nanoparticles and their arrangements on the substrate.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Review
Physics, Multidisciplinary
Jai Prakash, Depanshu Varshney, Shikha Chauhan, Ajeet Kaushik, Yogendra Kumar Mishra
Summary: Liquid crystals (LCs) have attracted scientific curiosity due to their combined properties of liquid and crystalline phases. Despite the development of breakthrough technologies, further refinement of LC materials is necessary for their applications in modern technologies. Understanding the behavior of LC materials under radiation and the associated risks is limited. Therefore, a review of different studies is important for better understanding and future directions. This review focuses on the variation of LC material parameters under irradiation, discusses the possible reasons behind the changes, and highlights the current and future radiation-based applications of LC materials.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
P. Priscill, Deepanshu Varshney, Jai Prakash, Sandeep Kumar, Ashwani Singh, Praveen Malik, Supreet, Arvind K. Gathania, Riccardo Castagna, Daniele Eugenio Lucchetta, Gautam Singh
Summary: We report the induction of thermally stable vertical alignment of nematic liquid crystal in a planar anchored cell by doping with eco-friendly carbon dots. Optical and dielectric studies confirm the induced vertical alignment and suggest the potential application of these composites in eco-friendly liquid crystal displays and other photonic devices.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Depanshu Varshney, Jai Prakash, Gautam Singh
Summary: In this article, the researchers investigate the influence of indium tin oxide (ITO) nanoparticles on the macroscopic molecular arrangement of a nematic liquid crystal material. They observe the dispersion and miscibility of ITO nanoparticles in the liquid crystal phase and study the dielectric parameters of the composites. The results show that the concentration of ITO nanoparticles affects the dielectric permittivity and relaxation frequency, as well as the clearing temperature of the liquid crystal material.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Multidisciplinary Sciences
Deepa Agashe, Sugandha Maheshwary, Jitendra Kumar Pattanaik, Jai Prakash, Pragya Bhatt, S. S. Arya, Sriparna Chatterjee, Pankaj Kumar, Paramdeep Singh, Nazia Abbas, Chandra Shekhar Sharma, Chirasree Roy Chaudhuri, Pooja Devi
Summary: The scientific enterprise in India has grown rapidly, and the status and concerns of young scientists are poorly understood. The Indian National Young Academy of Sciences conducted a survey and found that young scientists face challenges in establishing independent research careers, and proposed solutions to address them.
Article
Multidisciplinary Sciences
Jai Prakash, Depanshu Varshney, Michal Czerwinski
Summary: This article presents the formulation, characterization, and application of a newly prepared ferroelectric liquid crystal mixture named W315, including the observation of phase transitions and material constants. The findings can be used as valuable references for the development of FLC-based devices.
PROCEEDINGS OF THE INDIAN NATIONAL SCIENCE ACADEMY
(2021)
