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- 2018
- 3D display
- holographic display
- Augmented reality
- volumetric display
- liquid crystal
- blocking electrodes
- impedance spectroscopy
- liquid crystals
- electric conductivity
- Optoelectronic Information Science and Engineering
- Shanghai Jiao Tong University
- South Ural State University
- Technical University of Darmstadt
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High Speed and Narrow-Bandpass Liquid Crystal Filter for Real-Time Multi Spectral Imaging Systems
摘要： We have developed the high speed bandpass liquid crystal filter with narrow full width at half maximum (FWHM) of 5 nm for real-time multi spectral imaging systems. We have successfully achieved short wavelength-switching time of 30 ms by the optimization of phase retardation of thin liquid crystal cells.
关键词： narrow bandpass,fast switching,liquid crystal filter,spectral imaging,overdrive
更新于2025-09-23 15:23:52
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Diluted Oxide Interfaces with Tunable Ground States
摘要： The metallic interface between two oxide insulators, such as LaAlO3/SrTiO3 (LAO/STO), provides new opportunities for electronics and spintronics. However, due to the presence of multiple orbital populations, tailoring the interfacial properties such as the ground state and metal-insulator transitions remains challenging. Here, an unforeseen tunability of the phase diagram of LAO/STO is reported by alloying LAO with a ferromagnetic LaMnO3 insulator without forming lattice disorder and at the same time without changing the polarity of the system. By increasing the Mn-doping level, x, of LaAl1?xMnxO3/STO (0 ≤ x ≤ 1), the interface undergoes a Lifshitz transition at x = 0.225 across a critical carrier density of nc = 2.8 × 1013 cm?2, where a peak TSC ≈255 mK of superconducting transition temperature is observed. Moreover, the LaAl1?xMnxO3 turns ferromagnetic at x ≥ 0.25. Remarkably, at x = 0.3, where the metallic interface is populated by only dxy electrons and just before it becomes insulating, a same device with both signatures of superconductivity and clear anomalous Hall effect (7.6 × 1012 cm?2 < ns ≤ 1.1 × 1013 cm?2) is achieved reproducibly. This provides a unique and effective way to tailor oxide interfaces for designing on-demand electronic and spintronic devices.
关键词： anomalous Hall effect,2D electron liquid,oxide interfaces,superconductivity,metal-insulator transitions
更新于2025-09-23 15:23:52
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High-density Azobenzene Side Chain Polymer Brush for Azimuthal and Zenithal Orientation Photoswitching of Nematic Liquid Crystal
摘要： The azimuthal and zenithal orientation switching of nematic liquid crystals (NLCs) can be performed by photoresponsive azobenzene alignment layers called command surfaces. Such photoresponsive layers have been prepared by molecular assembly methods or spincast of polymer materials. This work reports on the photo-switching orientation behavior of NLC on a high-density brush of an azobenzene-containing side chain liquid crystalline polymer. On the high-density polymer brush surface, the zenithal homeotropic/planar photoalignment switching modes triggered by UV/visible light irradiation are reversed from those observed for traditional command surface systems, reflecting the azobenzene side chain orientation directing parallel with the substrate surface. Because the thermally stable trans-azobenzene provides the in-plane orientation of NLC, irradiation with linearly polarized visible light readily switches the azimuthal direction to an arbitrary direction, and the resulting orientation is retained persistently. This paper discusses the features of the architecture of high-density polymer brush as the command surface for NLC orientation.
关键词： azobenzene,photoalignment,photoresponsive surface,nematic liquid crystal,polymer brush
更新于2025-09-23 15:23:52
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Determination of liquid egg composition using ATR-FTIR spectroscopy and chemometrics
摘要： BACKGROUND: The use of liquid whole egg (LWE) in food industry as a substitute for shell eggs has been on the increase lately. Since the composition of LWE can easily be changed, determination of protein, lipid, moisture, and total soluble solid (TSS) contents of LWE has also gained importance. Traditional methods usually require more time and effort, and the use of toxic chemicals for sample preparation, where more efficient techniques (faster, cheaper, and more reliable) are needed. In this concern, a novel technique that determines LWE components using ATR-FTIR spectroscopy with partial least square regression (PLS) is presented in this study. RESULTS: The actual values of LWE components were detected by applying reference methods. The accuracy of PLS model was demonstrated by comparing the obtained predictions with the actual values of the component. High coefficients of determination values, which are 0.950, 0.992, 0.994, and 0.972, were achieved for protein, lipid, moisture, and TSS validation data sets, respectively. The error values, namely RMSEC, RMSECV, and RMSEP, were obtained in the range of 0.404-0.978, 0.57-1.82, and 0.83-1.84, respectively. CONCLUSION: ATR-FTIR spectroscopy coupled with chemometrics can provide a rapid and sensitive method for quality control of liquid egg composition.
关键词： chemometrics,composition,Liquid whole egg,ATR-FTIR spectroscopy,reference method
更新于2025-09-23 15:23:52
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In situ Characterization of Phase Transition of Amorphous Poly(9,9-di-n-octyl-2,7-fluorene) Thin Film During Thermal Annealing
摘要： Amorphous poly(9,9-di-n-octyl-2,7-fluorene)(PFO) thin films were characterized in situ via thermal annealing based on grazing incidence X-ray diffraction(GIXRD) profiles, UV-visible absorption spectrophotometry, and Fourier transform infrared spectroscopy(FTIR). The results of GIXRD indicated that the amorphous phase transformed into a crystalline phase when the annealing temperature was higher than 80 °C. Different outcomes were elicited for the intensities and d-spacings of the diffraction peaks below and above 80 °C, which were attributed to the formation of the κ-phase. The mechanism of phase transition was revealed by in situ UV-visible absorption and FTIR spectra, whereby the rearrangement of the side chains was dominant and the movement of the main chains was minimal, even when the annealing temperature was lower than 80 °C. In contrast, the rearrangement of the main chains was dominant when the temperature was higher than 80 °C.
关键词： Liquid crystalline κ-phase,Thermal annealing,Phase transition,Polyfluorene
更新于2025-09-23 15:23:52
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Single-Crystal Poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b′]dithiophen-2-yl)- <i>alt</i> -[1,2,5]thiadiazolo[3,4- <i>c</i> ]pyridine] Nanowires with Ultrahigh Mobility
摘要： We fabricated single-crystal poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b']-dithiophen-2-yl)-alt-[1,2,5]thiadiazolo-[3,4-c]pyridine] (PCDTPT) nanowires with ultrahigh mobility using a liquid-bridge-mediated nanotransfer molding method. The structural analysis of the single-crystal PCDTPT nanowires reveals that PCDTPT crystals have a triclinic structure, and the nanowires grow parallel to PCDTPT backbone chains, which provide important insights into its intrinsic charge transport. The single-crystal PCDTPT nanowire exhibits a superior charge carrier mobility of 72.94 ± 18.02 cm2 V-1 s-1 (maximum mobility up to 92.64 cm2 V-1 s-1), which is a record high value among conjugated polymers till date. In the single-crystal PCDTPT nanowire, the backbone chains in the linear structure along the nanowire growth axis lead to strong backbone delocalization, resulting in highly conductive polymer backbones and a drastic increase in charge carrier mobility. In addition, the single-crystal PCDTPT nanowire shows good environmental stability under air conditions compared to small-molecule organic semiconductors.
关键词： donor-acceptor-conjugated copolymers,liquid-bridge-mediated nanotransfer molding,PCDTPT,single-crystal polymer nanowire
更新于2025-09-23 15:23:52
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Highly Efficient Luminescent Liquid Crystal with Aggregation-Induced Energy Transfer
摘要： A luminescent liquid crystal molecule (TPEMes) with efficient solid-state emission is rationally constructed via the chemically conjugation of blue-emitting tetraphenylethene cores and luminescent mesogenic tolane moieties, which are both featured with aggregation-induced emission properties. As for this fluorophore, aggregation induced energy transfer from the emissive tolane mesogens to the lighting-up tetraphenylethene units endows the molecule pure blue emission in the suspension and bulk state. Combining DSC, POM and 1D XRD experiments, TPEMes is deduced to adapt thermodynamically more stable layered crystalline phase, and can be 'frozen' into a monotropic smectic mesophase due to kinetic reasons. As a result of more densely packing of TPEMes in the crystalline phase indicated by 1D XRD, the luminescence of TPEMes in crystalline phase has blue-shifted with 17 nm relative to the metastable mesophase.
关键词： tolane,tetraphenylethene,aggregation induced emission,aggregation induced energy transfer,hexagonal columnar phase,luminescent liquid crystals
更新于2025-09-23 15:23:52
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Hydrophilic Poly(vinylidene Fluoride) Film with Enhanced Inner Channels for Both Water- and Ionic Liquid-Driven Ion-Exchange Polymer Metal Composite Actuators
摘要： This study presents a novel and facile strategy to fabricate a hydrophilic poly(vinylidene fluoride) (PVDF) electrolyte film with enhanced inner channels for a high-performance and cost-effective ion-exchange polymer metal composite (IPMC) actuator. The resultant PVDF composite film is composed of hierarchical micro/nanoscale structures: well-defined polymer grains with a diameter of ～20 μm and much finer particles with a diameter of ～390 nm, producing three-dimensional interconnected, hierarchical inner channels to facilitate ion migration of the electrolyte matrix film has a high porosity of 15.8% and yields a high water uptake of 44.2% and an ionic liquid (IL, [EMIm]·[BF4]) uptake of 38.1% to make both water-driven and IL-driven IPMC actuators because of the introduction of polar polyvinyl pyrrolidone. Compared to the conventional PVDF/IL-based IPMC, both water-driven and IL-driven PVDF-based IPMCs exhibit high ion migration rates, thus effectively improving the actuation frequency and producing remarkably higher levels of actuation force and displacement. Specifically, the force outputs are increased by 13.4 and 3.0 folds, and the displacement outputs are increased by 2.2 and 1.9 folds. Using an identical electrolyte matrix, water-driven IPMC exhibits stronger electromechanical performance, benefiting to make IPMC actuator with high levels of force and power outputs, whereas IL-driven IPMC exhibits a more stable electromechanical performance, benefiting to make long lifetime IPMC actuator in air. Thus, the resultant IPMCs are promising in the design of artificial muscles with tunable electromechanical performance for flexible actuators or displacement/vibration sensors at low cost.
关键词： ionic exchange polymer metal composite (IPMC),ionic liquid (IL),poly(vinylidene fluoride) (PVDF),inner channel,electromechanical response,polyvinyl pyrrolidone (PVP)
更新于2025-09-23 15:23:52
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Chemical-Electrochemical Sequential Double-Step Polymerization in Liquid Crystal Allows for Imprinting of 3D Molecular Assembly Form Showing Electro-Chiroptical Effect
摘要： Chiroptical polypyrrole (PPy) film was prepared by sequential reaction of chemical oligomerization with FeCl3 and subsequent electrochemical polymerization in a cholesteric liquid crystal (CLC) consisting of 4-cyano-4’penthylbiphenyl (5CB) and cholesteryl oleyl carbonate (COC). Chemical oxidation reaction of pyrrole as a monomer with FeCl3 in the liquid crystal (LC) produces linear shaped pyrrole oligomer. The linear shaped precursor having good affinity with LC molecular can pre-align along the director of the CLC. Subsequent electrochemical polymerization of the precursor in the CLC affords structure transcription from the matrix CLC to the polymer, resulting production of PPy with effective imprinting of the LC order. Surface observations of the PPy film with polarizing optical microscopy (POM), scanning electron microscopy (SEM) and atomic force microscopy (AFM) reveal fingerprint textures of the surface, suggesting occurrence of transcription of the helical structure of the CLC to the polymer films. The PPy film shows electrochromism between -0.7 V and 0.3 V. Furthermore, the circular dichroism (CD) optical absorption spectra indicated that the PPy film exhibits optical activity even though no chiral centers in the molecular structure. The asymmetry of the resultant polymer is derived from 3-D chiral assembly imprinted from the matrix CLC. Therefore, the CD spectra of the PPy film at the oxidized and the reduced states show change in chiroptical activity. This phenomenon can be referred to as an electro-chiroptical effect.
关键词： electrochromic,liquid crystal,electrochemical polymerization,chiroptical,polypyrrole
更新于2025-09-23 15:23:52
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Incompressible limit for compressible nematic liquid crystal flows in a bounded domain
摘要： In this paper, we consider the incompressible limit of strong solution for the compressible nematic liquid crystal flows in a 3D bounded domain (cid:2) ? R3 where the the velocity field satisfies the Dirichlet boundary condition. We establish the uniform estimates with respect to the Mach number for the strong solutions with large initial data in a short time interval. Consequently, we obtain the convergence of the compressible nematic liquid crystal system to the incompressible nematic liquid crystals system as the Mach number tends to zero.
关键词： Incompressible limit,Dirichlet boundary condition,compressible nematic liquid crystal equations
更新于2025-09-23 15:23:52