Article
Chemistry, Physical
Mayank Jaiswal, Geetanjali Srivastava, Sonam Mishra, Praveen Kumar Singh, Ravindra Dhar, Roman Dabrowski
Summary: The green synthesis of copper oxide nanoparticles (CuO NPs) was successfully achieved using a biological, eco-friendly, and cost-effective method without requiring an inert atmosphere. The synthesized CuO NPs were characterized and confirmed to have a size of 2-3 nm through X-ray diffraction, ultraviolet-visible spectroscopy, and Fourier transform infrared spectroscopy techniques. Two different weight percentages (0.2 and 0.5) of the CuO NPs were dispersed in a liquid crystalline material (4-pentyl-4'-cyanobiphenyl, 5CB), and the physical properties of the pure 5CB and its nanocomposites were studied. The results showed enhancements in the nematic-isotropic transition temperature and conductivity, as well as a decrease in the optical band gaps of the dispersed samples.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Ceramics
Diming Xu, Haowei Zhang, Lixia Pang, Fayaz Hussain, Tao Zhou, Shi-Kuan Sun, Zhijiao Chen, Di Zhou
Summary: In this work, a novel monoclinic Scheelite structure phase of Bi(Ge0.5Mo0.5)O-4 is reported, with similar properties to BiVO4. The new phase exhibits a dielectric permittivity of approximately 35, a Qf value of around 20000 GHz, and a TCF value of -46 ppm/°C. These findings demonstrate the potential of the new Scheelite structure phase for modifying and substituting BiVO4 in various applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
T. K. Abhilash, Harris Varghese, Michal Czerwinski, Krzysztof Czuprynski, Achu Chandran
Summary: Fluorinated chiral dopants can be used to tune the dielectric and electro-optical properties of FLC materials, affecting parameters such as permittivity and phase transition temperature. The presence of fluorine partially screens molecular chirality, leading to changes in material properties.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Nanoscience & Nanotechnology
Yana Izdebskaya, Ziwei Yang, Mingkai Liu, Duk-Yong Choi, Andrei Komar, Dragomir N. Neshev, Ilya Shadrivov
Summary: Dielectric metasurfaces infiltrated with liquid crystals can be tuned by magnetic field, offering advantages over other liquid crystal tuning methods. This approach allows for gradual tuning of resonances without the need for pre-alignment or structured electrodes.
Article
Chemistry, Multidisciplinary
Martin Haehsler, Hajnalka Nadasi, Martin Feneberg, Sebastian Marino, Frank Giesselmann, Silke Behrens, Alexey Eremin
Summary: Self-assembly is a crucial mechanism for designing multifunctional materials, especially in soft hybrid materials where components of different natures interact to form structures with specific functions. A novel magnetic hybrid material was demonstrated, showing the manipulation of molecular tilt through a delicate balance between topologically-assisted colloidal self-assembly of magnetic nanoparticles and anisotropic molecular interactions in a liquid crystal matrix.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Y. Trabelsi, N. Ben Ali, Francis Segovia-Chaves, Herbert Vinck Posada
Summary: This paper theoretically investigates the properties and tuning methods of photonic quasicrystals built using hybrid materials, achieving a tunable photonic band gap with resonant peaks. The properties are modulated by superconductor temperature, dielectric layer thickness, and quasi-periodic structure lattice parameters, with discussions on the behavior of photonic band gaps under different conditions.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Crystallography
Kyung M. Lee, Timothy J. Bunning, Timothy J. White, Michael E. McConney, Nicholas P. Godman
Summary: The study demonstrates that the position and bandwidth of the selective reflection notch in polymer-stabilized cholesteric liquid crystals (PSCLCs) can be adjusted by applying a DC field. The concentration of ions trapped within the polymer network significantly influences the electro-optic response of PSCLC, with photoinitiators increasing ion density in PSCLC. By isolating the contribution of ionic impurities associated with liquid crystal monomers (LCMs) through initiator-less polymerization, the study shows that the tuning or bandwidth broadening of the CLC reflection band depends on the concentration of LCMs and the chirality of the LCM.
Article
Chemistry, Multidisciplinary
Praveen Kumar Singh, Prashant Dubey, Roman Dabrowski, Ravindra Dhar
Summary: The colloidal suspension of 8CB dispersed with graphene oxide showed differences in thermal, optical, and electrical properties compared to pure samples. Transition temperatures were reduced, band gap increased, and dielectric anisotropy was higher in dispersed samples. Conductivity in the smectic phase was lower, relaxation phenomenon shifted to lower frequencies, and other properties such as threshold voltage and elastic constants showed increases in dispersed nanocomposite.
Article
Chemistry, Physical
A. D. Kurilov, D. N. Chausov, V. V. Osipova, R. N. Kucherov, V. V. Belyaev, Y. G. Galyametdinov
Summary: This work focuses on synthesizing highly luminescent hybrid CdSe/CdS core/shell quantum dots and doping them into a nematic liquid crystal to obtain new composites. The sizes of the quantum dot cores and additional ZnS shells are correlated with the luminescence and dielectric characteristics of the composites.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Jordan Hobbs, Matthew Reynolds, Mallasandra Krishnappa Srinatha, Govindaswamy Shanker, Johan Mattsson, Mamatha Nagaraj
Summary: In this study, a detailed investigation of two cyanobiphenyl-based liquid crystal (LC) tripods was conducted, focusing on their phase behavior, molecular relaxation dynamics, rheology, and dielectric properties. It was found that the length of the spacer units in the tripods affects their properties, including the wide nematic range and large birefringence. Four molecular relaxation processes were identified, and the ion transport properties were found to be influenced by the design of the tripod mesogen arm.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Aleksandra Gridyakina, Natalia Kasian, Mi losz S. Chych Lowski, Marta Kajkowska, Piotr Lesiak
Summary: Multicomponent liquid crystal systems are of great interest in scientific research and practical applications. By combining liquid crystals, polymers, and nanoparticles into a three-component system, it is possible to optimize the performance in display applications and expand the applications of multicomponent systems.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Ren Zheng, Lingling Ma, Wei Feng, Jintao Pan, Zeyu Wang, Zhaoxian Chen, Yiheng Zhang, Chaoyi Li, Peng Chen, Hari Krishna Bisoyi, Bingxiang Li, Quan Li, Yanqing Lu
Summary: Advances in biomimicry have led to the rise of advanced robotics, offering promising revolutions in various fields. This article presents the design, fabrication, and operation of crosslinked liquid crystal actuators that combine microstructure programming and macroscopic shape morphing for active optics and photonics. These actuators, consisting of twisted nematic liquid crystal molecules, exhibit large bending deformations in response to heat, enabling programmable bending motions and self-sustained waddling oscillations. The achievement of dynamic 2D beam steering and self-sustained light field modulation further enhances their potential applications in autonomous active optical systems, photonic applications, and self-governing robotics.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Srinivas Pagidi, Ramesh Manda, Hoon Sub Shin, Junhyeok Lee, Young Jin Lim, MinSu Kim, Seung Hee Lee
Summary: This study presents a new approach of using a polymer composite blended with conductive PEDOT:PSS polymer to enhance the dielectric property of the system for flexible liquid crystal devices. The experimental results show that the composite polymer matrix provides a pathway of electric fields via the PEDOT:PSS, reducing the voltage drop in the composite matrix. The Kerr constant and transmittance of probe light passing through the sample increase up to 11.7% and 37.3% respectively with the addition of 3.5 wt% of PEDOT:PSS.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Mechanical
Sukru Karatas
Summary: The study investigated the frequency and voltage dependence of electrical and dielectric properties of Ag/nGO doped PVA/p-Si structures. Results showed that capacitance, conductance, dielectric constant, dielectric loss, and loss tangent decreased with increasing frequency, while ac electrical conductivity increased. These properties were found to be strongly dependent on frequency and voltage.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Polymer Science
Meina Yu, Jianjun Xu, Tianyang Wang, Luoning Zhang, Huiyun Wei, Cheng Zou, Yanzi Gao, Huai Yang
Summary: This study investigates the impact of chain structure on the electro-optical performance of PDLC films. It is found that adjusting the alkyl chain length can improve the contrast ratio, while introducing branched chains can compensate for the increased driving voltages. The optimized PDLC film achieves a high contrast ratio and shows two distinct states: highly transparent state and strong scattering state.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Katerina Skopalova, Itana Nusa Bubanja, Dragomir Stanisavljev, Nikola Cvjeticanin, Vera Kasparkova, Eliska Dad'ova, Erika Pavlikova, Marek Koutny, Marija Gizdavic-Nikolaidis, Petr Humpolicek
Summary: This study compares the biological properties of PANI prepared by different synthesis methods and oxidizing agents, which improves its potential applications in the biomedical field.
Article
Materials Science, Multidisciplinary
Hui-Ping Li, Cai-Yan Gao, Zhi-Ping Chen, Xin-Heng Fan, Lian-Ming Yang
Summary: In this study, a novel type of D-A non-fused-ring copolymers was designed and synthesized to overcome the trade-off relationship between electrical conductivity and Seebeck coefficient in organic semiconductors. The incorporation of fluorine atoms into the polymer backbone effectively increased the ordered degree of molecular stacking and improved both the electrical conductivity and Seebeck coefficient. The bimodal orientation of polymers played a crucial role in decoupling the correlation between electrical conductivity and Seebeck coefficient.
Article
Materials Science, Multidisciplinary
Mansour A. S. Salem, Amjad Mumtaz Khan, Hatem A. M. Saleh, Khalil M. A. Qasem, Mizna Ahmed, Aadil Shafi Bhat, Abdulaziz Abdullah Qasem Ali, Younes S. A. Ghanem, Ali Alrabie, Abdel-Basit Al-Odayni, Waseem Sharaf Saeed, Basheer Al-Anesi
Summary: This research focuses on the versatile substance, polyaniline/layered double hydroxide (PANI@Nd-Co/LDH), under solvothermal conditions. A thorough analysis of its structure and morphology was conducted using various analytical methods. The findings showed that PANI@Nd-Co/LDH exhibited highly sensitive and specific fluorescence detection of Pb(II) and Al(III), outperforming other heavy metal ions. The sensor demonstrated a turn-off fluorescence response for Pb(II) ions and a turn-on fluorescence response for Al(III) ions. The minimum detectable limits (MDL) were determined to be 9.6 nM for Pb(II) and 220 nM for Al(III). PANI@Nd-Co/LDH could be easily regenerated and reused for multiple cycles. The detection mechanisms involved the inner filter effect (IFE) for Pb(II) and the chelation-enhanced fluorescence (CHEF) effect for Al(III). These results highlight the excellent potential of PANI@Nd-Co/LDH in the detection and recognition of Pb(II) and Al(III) ions.
