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Applications of Isosceles Triangular Coupling Structure in Optical Switching and Sensing.
Sensors (Basel)
December 2024
School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China.
In the case of waveguide-based devices, once they are fabricated, their optical properties are already determined and cannot be dynamically controlled, which limits their applications in practice. In this paper, an isosceles triangular-coupling structure which consists of an isosceles triangle coupled with a two-bus waveguide is proposed and researched numerically and theoretically. The coupled mode theory (CMT) is introduced to verify the correctness of the simulation results, which are based on the finite difference time domain (FDTD).
View Article and Find Full Text PDFInvestigation of the Structure-Property Relation of Anthraquinone Dye Molecules with High Dichroism in Guest-Host Liquid Crystal Systems via Computational Methods.
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December 2024
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
By combining molecular dynamics (MD) simulations and density functional theory (DFT), the influence of dye structure on the optical modulation properties of negative-mode guest-host liquid crystal (GHLC) systems was systematically investigated. Firstly, the reliability of the simulation method was validated by comparing the performance parameters of the GHLC system obtained from simulations with those from experimental results. Subsequently, a series of guest dye molecules, along with their mixtures with negative dielectric anisotropy mesogens, were designed and analyzed.
View Article and Find Full Text PDFStudy on the Synthesis and Electrochemical Properties of Nitrogen-Doped Graphene Quantum Dots.
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Shandong Jinhong New Material Co. Ltd., Weifang 262100, China.
Nitrogen-doped graphene quantum dots (N-GQDs) are widely used in biosensing, catalysis, and energy storage due to their excellent conductivity, high specific surface area, unique quantum size effects, and optical properties. In this paper, we successfully synthesized N-GQDs using a facile hydrothermal approach and investigated the effects of different hydrothermal temperatures and times on the morphology and structure of N-GQDs. The results indicated that the size of N-GQDs gradually increased and they eventually aggregated into graphene fragments with increasing temperature or reaction time.
View Article and Find Full Text PDFThermal Actuators Relying on Elastomer-Dispersed Liquid Crystals: From Imines with Supramolecular Chirality and Ferroelectricity to Soft Robots.
ACS Appl Mater Interfaces
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Department of Inorganic Polymers, "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania.
The locomotion of various organisms relies on the alternated elongation-contraction of their muscles or bodies. Such biomimicry can offer a promising approach to developing soft robotic devices with improved mobility and efficiency. Most strategies to mimic such motions rely on reversible size modifications of some materials upon exposure to external stimuli.
View Article and Find Full Text PDFInfluence of CO Treatment Pressure on the Chemical Composition and Rheological Properties of Degassed Waxy Crude Oil.
ACS Omega
December 2024
College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, People's Republic of China.
Article Synopsis
- The study investigates how enhanced oil recovery using carbon dioxide (CO) alters the properties of crude oil, specifically focusing on wax characteristics and viscosity changes.
- As the treatment pressure increases from atmospheric levels to higher pressures (up to 25 MPa), notable changes in the composition of crude oil occur, including decreases in light hydrocarbons and increases in paraffins and wax.
- Treatment with supercritical CO (scCO) leads to smaller wax crystal sizes and increased viscosity, with significant enhancements in gelation characteristics and wax precipitation temperatures, especially notable between pressures of 5 to 15 MPa.
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