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Preparation and Properties of a Flexible Al <sub/>2</sub> O <sub/>3</sub> /Al/Al <sub/>2</sub> O <sub/>3</sub> Composite
摘要： A ?exible Al2O3/Al/Al2O3 sandwich composite was prepared by microarc oxidation (MAO) on an aluminum foil with 50 μm thickness. The obtained ceramic layers with a thickness of 20–22 μm on the surface of the aluminum foil are mainly Al2O3. The composite, with exterior layers of Al2O3, can be bent more than 90° without observable fracture or delamination. The morphology of the MAO coatings, which has been characterized by scanning electronic microscopy (SEM), is porous and contains microcracks. The energy-dispersive spectrum (EDS) and the X-ray di?raction (XRD) results indicate that the MAO coatings mainly contain c-Al2O3. Based on experimental observations, the ?exibility mechanism was explained by the presence of the microcracks which improve the toughness and decrease the sti?ness of the MAO coatings. The well-adhered layers of the sandwich structure can also prevent the fracture of the MAO coating. The thermal di?usivity of the composite is between that of aluminum and Al2O3 and the speci?c electrical resistance is 45.4% of that of Al2O3 under 50 V. This composite has the potential to be applied as tailorable low-voltage insulation material.
关键词： insulation material,microarc oxidation,composite,Al2O3/Al/Al2O3,flexible
更新于2025-09-10 09:29:36
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Improvement of the third order nonlinear optical properties of nematic liquid crystal under the influence of different compositional percentage of doped SWCNT and the external electric field
摘要： In this research, the nematic liquid crystal (NLC) was doped with varying concentration (0-1 % wt.) of single walled carbon nanotubes (SWCNTs) at room temperature to study the nonlinear optical (NLO) properties of E5CN7@CNT cell.The third order NLO properties such as the nonlinear susceptibility, the nonlinear refraction (NLR) and the nonlinear absorption (NLA) were determined by using Z-scan techniques. The nonlinear studies have been done using a continuous wave (CW) He: Ne laser at 632.8 nm.Doping SWCNTs to eutectic uniaxial NLC (E5CN7) enhanced the third order nonlinear susceptibility, ??(3) and consequently the nonlinearity properties of composite systems improved.It is found that at lower concentration of CNTs (c< 0.75 % wt.), the third order nonlinear susceptibility are increased, but for concentration 0. 5<c<1 % wt., the third order nonlinear susceptibility are decreased. The negative sign of the observed NLR index, indicates that the E5CN7@CNT exhibits self-defocusing type optical nonlinearity. The two photon absorption (TPA) behavior, corresponding to negative sign NLA of samples. The reorientation of samples molecules amplifies upon the application of electric field, then nonlinearity increases.
关键词： Composite materials,Nematic liquid crystal,Carbon nanotubes,Third order nonlinear susceptibility,Nonlinear optics,Electric field,Z-scan method
更新于2025-09-10 09:29:36
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Advantages of TiO2/carbon nanotube modified photocatalytic membranes in the purification of oil-in-water emulsions
摘要： For the effective puri?cation of emulsi?ed oil contaminated waters advanced treatment methods have to be applied, such as membrane ?ltration, which is able to eliminate macro-, and even nanoscale oil droplets, however, membrane fouling is still a major problem, which prevents economic utilization. Therefore, fouling mitigation is one of the most important aspects in the ?eld of membrane separation developments. In the present study, solely TiO2 and TiO2/carbon nanotubes (CNT) composite modi?ed PVDF membranes were prepared and used to purify oil-in-water emulsions. Achievable ?uxes, reversible and irreversible ?ltration resistances, fouling models, ?ltration ef?ciencies and photocatalytic activities were compared in case of different nanomaterial covered and unmodi?ed PVDF membranes. Applying either solely TiO2 or solely CNT coating resulted in the signi?cant reduction of total ?ltration resistance in both cases, but the combination of the two components (TiO2 with 1 wt% CNT) resulted in by far the highest ?ux and lowest resistance, meanwhile, the enhanced photocatalytic ef?ciency of the composite was also achieved. To the best of our knowledge, this study demonstrates the bene?cial effects of the combination of TiO2 and CNT nanomaterials for the ?rst time in the ?eld of membrane separation of oil-in-water emulsions.
关键词： membrane,titanium dioxide,oil-in-water emulsion,enhanced ?ux,carbon nanotube,composite
更新于2025-09-10 09:29:36
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Preparation of Ni(OH)2/TiO2 porous film with novel structure and electrochromic property
摘要： Ni(OH)2/TiO2 nanorod composite porous film with a novel structure and remarkable electrochromic (EC) behavior was prepared on a fluorine doped tin oxide (F:SnO2; FTO) coated glass substrate by hydrothermal and solvothermal techniques. A pure Ni(OH)2 porous film was also prepared on another FTO substrate by the solvothermal technique for comparison. The growth process of Ni(OH)2 on the surface of TiO2 nanorod layer was investigated carefully. The component, morphology and microstructure of the films, as well as their EC performances including transmittance, cyclic voltammetry (CV), cycle life and response time were characterized. Compared with those of the pure Ni(OH)2 film, the EC performances of Ni(OH)2/TiO2 composite film have exhibited obvious enhancement owing to the good interface bonding, Ni(OH)2 porous structure, TiO2 nanorod layer and interpenetrating structure. Furthermore, it is noteworthy that the transmittance contrast in near infrared light area was distinctly improved, and even exceeded 95% after the 100th cycle, promising the Ni(OH)2/TiO2 nanorod composite porous film a potential EC application in near infrared light area in the future.
关键词： Composite porous film,Electrochromic property,Ni(OH)2/TiO2 nanorods,Solvothermal,Preparation
更新于2025-09-10 09:29:36
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AIP Conference Proceedings [AIP Publishing LLC 41ST ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Volume 34 - Boise, Idaho (20–25 July 2014)] - Feasibility of PZT ceramics for impact damage detection in composite structures
摘要： Fiber reinforced plastic composites are becoming widely used in vehicles and airframe structures due to their high strength to weight ratio. However unlike metals, the multilayered composite structures are more susceptible to damage mechanisms such as disbonds and delaminations due to impacts. It is often dif?cult to visually detect the damage. Lead-Zirconate-Titanate (PZT) thin ?lms are becoming popular for in-situ structural health monitoring due to their small size, high piezoelectric coupling coef?cient, and ease of surface-mounting and/or embedding in composite structures. A network of such transducers could be utilized for damage detection using guided wave techniques, impedance techniques, or passive impact detection techniques. However, the PZT ?lms are subject to the same impact probabilities that the structure encounters. If the transducers fail due to the subjected impacts, they can result in false readings and ultimately failing to correctly detect damage in the structure. This paper presents a feasibility study using the guided wave S0 mode for detecting impact damage. The health of the structure is quanti?ed using guided wave measurements, and the PZT health is monitored using impedance methods.
关键词： impact damage detection,impedance techniques,PZT ceramics,composite structures,guided wave techniques
更新于2025-09-10 09:29:36
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Power performance of BFO-graphene composite electrodes based supercapacitor
摘要： In the present work, the electrochemical performance of BiFeO3-graphene composite as electrodes material for supercapacitor has been investigated for high power application. The composite material was coated on the stainless steel substrate by drop casting method. The supercapacitor device was made in two electrodes configurations and an aqueous electrolyte of 1M Na2SO4 was filled between the electrodes. The electrochemical performance was determined using cyclic voltammetery curves and constant charging/discharging process. It was observed that the supercapacitor made of BFO-graphene composite electrodes can deliver a power of 18.75 kW/kg with maintaining the energy density of 1.9 Wh/kg. These values are comparable to reported values in the literature. Surface morphology of the electrode was characterized by scanning electron microscopy. X-ray diffraction was also used for the structural analysis of the electrode.
关键词： Graphene,BFO,Supercapacitor,Composite
更新于2025-09-10 09:29:36
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A Facile Realization Scheme for Tactile Sensing with a Structured Silver Nanowire-PDMS Composite
摘要： To mimic the sensing function of human skin, the rational design of force-sensitive materials is highly required for sensors. Here, a facile design of resistive-type tactile sensors based on a structured silver nanowire-polydimethylsiloxane composite is reported for applications in electronic skins and wearable electronics. The composite has a hollow microstructure of interconnected channels, and the inner surface of the channels is a conductive layer consisting of silver nanowires. The sensing function to external force is realized by measuring the resistance change upon deforming. The deforming causes the distance change of silver nanowires and the contact-area change of the inner surfaces. Such a unique structure promises a robust mechanical property due to the half-embedded silver nanowires which are free of peeling off, and also makes it possible to control the device sensitivity by its mechanical structure and the elastic property of the polydimethylsiloxane. The results show that the composite has steady-state responses to various pressures and stretches, even to mouth blowing, a response time of ≈90 ms, and favorable repeatability over 2000 cycles of bending/unbending. The 3D structure enables pressing, bending, pulling and torsional force sensing, and promises real-time monitoring of various human motions ranging from blood pulses to joint movements.
关键词： tactile sensing,hollow structures,Ag NWs/PDMS composite,resistive force sensors
更新于2025-09-10 09:29:36
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Mechanically Tunable Bilayer Composite Grating for Unique Light Manipulation and Information Storage
摘要： Composite gratings play important roles in modern information technology. However, such gratings are generally based on the same structural pattern with limited types, and their structural parameters are difficult to tune, which greatly limit their application. A mechanically tunable composite grating in bilayer film, which orthogonally couples a sinusoidal phase grating and a rectangular phase grating, is developed here. The structural parameters of the grating can be well tuned by mechanically stretching or releasing the grating in the uniaxial direction. Naturally, this property allows tunable light manipulation: that is, a single incident laser beam can be split into a 2D diffraction beams array, and the intensity and propagation angle of each diffraction beam can be precisely controlled via mechanical manipulation of the grating. A theoretical model based on scalar diffraction theory that can quantitatively describe and accurately predict this light manipulation is further established. In addition, after treatment with an electron beam, the tunable structures can be immobilized, which enables the storage of information in the bilayer film. This work may open up new pathways for composite grating fabrication and further extend the applications of composite gratings in diverse fields.
关键词： bilayer composite grating,light manipulation,information storage,mechanically tunable
更新于2025-09-10 09:29:36
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Photoacoustic and fluorescent effects in multilayer plasmon-dye interfaces
摘要： Progress in understanding the cell biology and progression of disease depends on advanced imaging and labeling techniques. Here, we address this demand by exploring novel multilayered nanocomposites (MNCs) with plasmonic nanoparticles and adsorbing dyes in thin nonabsorbing shells as supercontrast multimodal photoacoustic (PA) and fluorescent agents in the near-infrared range. The proof of concept was performed with gold nanorods (GNRs) and indocyanine green (ICG) dispersed in a matrix of biodegradable polymers. We demonstrated synergetic PA effects in MNCs with the gold–ICG interface that could not be achieved with ICG and GNRs alone. We also observed ultrasharp PA and emission peaks that could be associated with nonlinear PA and spaser effects, respectively. Low-toxicity multimodal MNCs with unique plasmonic, thermal, and acoustic properties have the potential to make a breakthrough in PA flow cytometry and near-infrared spasers in vivo by using the synergetic interaction of plasmonic modes with a nearby absorbing medium.
关键词： gold nanorods,fluorescence,in vivo flow cytometry,biocompatible polymers,photoacoustic effect,indocyanine green,multilayer composite,fluorescence quenching
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE ISAF-FMA-AMF-AMEC-PFM Joint Conference (IFAAP) - Hiroshima (2018.5.27-2018.6.1)] 2018 IEEE ISAF-FMA-AMF-AMEC-PFM Joint Conference (IFAAP) - Bi<inf>4</inf>Ti<inf>3</inf>O<inf>12</inf>/SrTiO<inf>3</inf>Sol-Gel Composite for Ultrasonic Transducers
摘要： In this study, lead-free new sol-gel composite, Bi4Ti3O12(BiT)/SrTiO3(ST) was developed. 100μm thick films were fabricated on 3mm thick titanium substrates by sol-gel spray technique. Polarization process was carried out at room temperature and 400°C. Samples were set onto a hot plate and ultrasonic response in pulse-echo mode was recorded by a digital oscilloscope from room temperature to 500°C. As a result, each samples showed reflected wave at 500°C. Therefore, BiT/ST sol-gel composite have high temperature endurance up to 500°C. In addition, BiT/ST films was able to polarize at room temperature.
关键词： ultrasonic transducer,high temperature,nondestructive testing,sol-gel composite
更新于2025-09-10 09:29:36