Materials Literature
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A grooved surface with anisotropic wettability was fabricated on a silicon substrate using photolithography, reactive ion etching, and a KOH etching process. The contact angles (CAs) of water droplets were measured and compared with the theoretical values in the Cassie state and Wenzel state. The experimental results…
The scalability of nanostructured, self-assembled antireflection (AR) coatings has been demonstrated on 6-inch glass and silicon wafers. Ultra-high transmittance through these large-area coatings has been confirmed by measuring the short circuit current of a CIGS-based thin film photovoltaic (PV) device placed below t…
Hierarchically porous metal-TiO2/graphitic carbon microspheres (M-TiO2/GCM) (where M= W, Sn, Ni, Co, or Ce) were synthesized for the first time by a simple colloidal crystal templating method. X-ray diffraction, energy dispersive spectroscopy, nitrogen adsorption–desorption, scanning electron microscopy, and transmiss…
In this work, high density polyethylene (HDPE), ethylene-vinyl acetate (EVA) copolymer and expandable graphite (EG) flame retardant composites were prepared by using a twin screw extruder technique. The thermal stability and flame retardant properties of the composites were investigated by the thermogravimetric analys…
This work aimed to evaluate the bending strength (MOR) and the bending modulus of elasticity (MOE) of particle boards manufactured with Pinuselliottiiand Eucalyptusgrandis species and the addition of waste of Pinuselliottii tree pruning, using a bicomponent polyurethane resin-based castor oil as an adhesive. We prepar…
Self-sharpening diamonds were synthesized using the mixture of water-atomized FeNi alloy and graphite powders as raw materials, which were reduced and purified, granulated, and then compressed to prepare powder catalyst capsule. The influences of some key parameters, such as size and oxygen content of the powder catal…
Electrospun nanofibrous mats loaded with inorganic nanoparticles can find application as separators for lithium-ion batteries. A good disaggregation of nanoadditive in the starting polymeric solution is a necessary condition to obtain fibers with homogeneous dispersion of nanoparticles, thus with improved mechanical,…
Tiles functionalized with titanium dioxide (TiO2) for the elimination of air pollutants were prepared by the dip-coating process with titanium alkoxide solution. The synthesis of the coating solution consist of a chemical method employing polyethylene glycol (PEG) to obtain better dispersion and adhesion of TiO2 parti…
The effect of the number of carbon atoms in a carbon-bearing precursor molecule on the crystallite size in diamond films grown on silicon substrates by microwave plasma-enhanced chemical-vapor deposition is investigated. It is shown that the crystallite size decreases with increasing number of carbon atoms in the mole…
In high voltage (H.V.) plant, ageing processes can occur in the insulation system which are totally unavoidable and ultimately limit the operational life of the plant. Ultimately, partial discharge (PD) activity can start to occur at particular points within the insulation system. Operational over stressing and defect…
The interfaces, that are formed between the nanoparticles and the polymer in a polymer nanocomposite, are constituted from layers, which have different structure and characteristics than the polymer matrix. The role of interfaces in determining the dielectric properties is dominant, especially as interfaces of neighbo…
가변 방사율 라디에이터는 우주환경에서 작동하는 장비의 온도가 낮을 때는 방사율이 낮아져 시스템의 외부로의 열 손실을 줄이고, 반대로 온도가 높은 때는 방사율이 높아져 장비의 열을 외부로 방출할 수 있어 효율적인 열제어가 가능하게 한다. 가변 방사율 소재로 보편적으로 이용하고 있는 것 중 하나인 감온변색 장치(thermochromics device)는 추가적인 장비 필요 없이 열제어가 가능하기 때문에 효율적이고 고장이 발생하지 않는 장점을 가지고 있다. 본 연구는 이와 같은 이유로 감온변색 장치의 소재 중 하나인 LSMO(La1-xSrxMnO3)채택하여 졸-겔(sol…
The effects of cure temperature history on the stability of hinged structure poly (4,4-oxydiphenylene pyromellitimide) (PMDA-ODA) polyimide were studied by dynamic mechanical analysis. The polyimide films were cured under different curing conditions and peeled off by substrate etching. It was found that a proper cure…
This paper is part of a research activity concerning theoretical and experimental studies of cavitation as an Advanced Oxidation Process in a convergent-divergent nozzle. The capability and peculiarities of this technology in degrading organic pollutants in water effluents are addressed by theoretical and experimental…
Diamond films have great potential for micro-electro-mechanical system (MEMS) application. For device realization, precise patterning of diamond films at micrometer scale is indispensable. In this paper, simple and facile methods will be demonstrated for smart patterning of diamond films, in which two etching techniqu…
A series of new hydrazones based on 3,3-dimethyl-7-hydroxy-8-formyl-[2H]-1-benzopyran-2,1-[2]-oxaindane] with the substituents of different nature in the hydrazone moiety was synthesized. A comparative study of photochromism and complexation of the synthesized spiropyrans with a number of metal cations was carried out…
Jie Zhoua, Lin Dua, Zongze Lia, Yongfeng Qiaoa, Jing Liua, Minrong Zhua, Peng Chena & Qihua Zhaoa* a Key Laboratory of Medicinal Chemistry for Natural Resource Education Ministry, Department of Chemistry , Yunnan University , Kunming , China * Contributed equally to this work. E-mail: qhzhao@ynu.edu.cn Two new paddle-…
Thermal fractionation via the method of successive self-nucleation and annealing was used for the first time to study the crystallinity of vinyl acetate-vinyl alcohol copolymers with different random distributions of chain units. The lamella-thickness distribution was calculated through the Gibbs-Thomson equation. It…
The actively water-cooled In-Vessel Components (IVCs) of the stellarator Wendelstein 7-X consist of the divertor, the first wall protection components, the port liners, each designed for different loading conditions, and the associated pipework, the control coils, the cryo-pump system, the Glow discharge electrodes, a…
The potential of utilizing the ultra-nanocrystalline (UNCD) films for detecting the Au-ion irradiation was investigated. When the fluence for Au-ion irradiation is lower than the critical value (fc = 5.0 × 1012 ions/cm2) the turn-on field for electron field emission (EFE) process of the UNCD films decreased systematic…