Materials Literature
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Soil burial tests were carried out to evaluate the effect of biodegradation on the mechanical properties (tensile, flexural, and impact) and the mass loss of OPT fiber-filled RPP composites, as compared to control samples (virgin PP and RPP without filler). The composite samples were prepared using 30% w/w of OPT fill…
Here we report the preparation of crystallized lanthanide phosphate (LnPO 4 ) nanostructures at room temperature on solid substrates by the layer-by-layer adsorption and reaction method comprising repetitive adsorption of lanthanide ions and subsequent reaction with phosphate ions. Taking the fabrication of LaPO 4, fo…
Abstract This study deals with the radio‐frequency plasma treatment of polycarbonate surfaces with argon. The wettability of polycarbonate was examined by static contact angle measurements with polar solvents (deionized water and formamide) and a nonpolar solvent (diiodomethane). The surface free energy of the polycar…
ZnO powders were prepared via the solid‐state reaction at 800°C in air, nitrogen, and hydrogen atmospheres, respectively. Raman spectra show that the concentration of oxygen vacancies greatly increases when the sample is prepared in hydrogen atmosphere. The particle size distributions of the powders prepared in air an…
Petal‐like alumina flakes were prepared by hydrothermal reaction at 170°C for 6 h with aqua‐based precursor materials. The gel particles were calcined at 550°–1200°C. The gel and calcined particles were characterized by differential thermal analysis (DTA), thermogravimetry (TG), X‐ray diffraction (XRD), Fourier transf…
Abstract The effect of Ag addition on Ni/YSZ Carbon tolerance was studied by means of thermogravimetric, catalytic and electrocatalytic experiments. Ni/YSZ activity towards C deposition can be significantly decreased by adding 1 to 5 at.‐% (atomic ratio) Ag with respect to Ni. It was found that the activation energy o…
RF magnetron sputtering of a nylon target in different gas mixtures was studied in order to evaluate the capability of this process to deposit amino-rich coatings needed in a wide range of biomedical applications. It has been demonstrated that both the deposition rate of the coatings and the surface density of primary…
A two dimensional numerical model of a solid oxide fuel cell (SOFC) with electrode functional layers is presented. The model incorporates the partial differential equations for mass transport, electric conduction and electrochemical reactions in the electrode functional layers, the anode support layer, the cathode cur…
The results of a comprehensive study of the structural, magnetic, and magnetotransport properties of the Heusler compounds ${\text{Ru}}_{2\ensuremath{-}x}{\text{Fe}}_{x}\text{CrSi}$ are presented. The Fe-rich compounds $(x\ensuremath{\ge}1.5)$ exhibit a usual ferromagnetic transition. The Ru-rich compound $(x=0.1)$ do…
We investigate the electronic and magnetic properties of hydrogenated carbon nanotubes using ab initio spin-polarized calculations within both the local density approximation (LDA) and the generalized gradient approximation (GGA). We find that the combination of charge transfer and carbon network distortion makes the…
In this study, 25-year-old oil palm biomass (OPB) fiber—polypropylene (PP) composites are prepared by five different fiber loadings (10, 20, 30, 40, and 50%). The types of OPB used are oil palm empty fruit bunches, oil palm frond, and oil palm trunk. Transmission electron microscopy has confirmed that the cell wall st…
Periodic mesoporous coesite was obtained by a modified nanocasting process from a periodic mesoporous silica SBA-16/C composite at a pressure of 12 GPa and 350 degrees C.
Abstract Novel citric acid‐based polyesters were synthesized by condensation of citric acid, 1,8‐octanediol, and unsaturated monomers such as glycerol 1,3‐diglycerolate diacrylate and bis(hydroxypropylfumarate). Under the synthesis conditions used, the crosslinked elastomeric network exhibited a wide range of mechanic…
We discuss a method to control the coating thickness deposited onto large and strongly curved optics by ion beam sputtering. The technique uses an original design of the mask used to screen part of the sputtered materials. A first multielement mask is calculated from the measured two-dimensional coating thickness dist…
A highly condensed epoxy-oligosiloxane resin was synthesized using a sol-gel condensation reaction of (3-glycidoxypropyl)trimethoxysilane and diphenylsilanediol in the presence of solvent. A higher degree of condensation and a larger molecular size of oligosiloxanes were achieved compared to a condensation reaction wi…
The use of microwave irradiation to accelerate both inorganic and organic chemical reactions has attracted widespread attention. Generally, microwave-mediated synthesis of quantum dots (QDs) has been conducted in aqueous solution. Here, using commercial diesel and glycerol as reaction medium, a microwave-mediated nona…
Natural fibers can be used as reinforcements in thermoplastic non-structural applications. Commingling them with matrix fibers lowers the melt flow distance of molten matrix during the processing. In this study, polypropylene (PP) and textile cotton fibers were commingled and fabricated to composite laminates. Process…
Scale-up sucrose crystals grown from a furfuryl alcohol−water sucrose solution at 60 °C exhibited a wide endothermic peak from 140° to 170 °C by differential scanning calorimetry (DSC) at 10 °C/min, whereas commercial sucrose crystals displayed only one sharp melting peak around 185° to 189 °C. Surprisingly, it was fo…
The magnetic properties and magnetocaloric effect (MCE) of NdCo 2 B 2 were investigated by magnetization and heat capacity measurements. The compound exhibits a paramagnetic to ferromagnetic transition at T C = 27 K. The effective magnetic moment is 3.53 μ B /Nd atom, and the magnetic ground state of Nd ion forms a do…
Abstract We consider a subclass of tilings: the tilings obtained by cut-and-projection. Under somewhat standard assumptions, we show that the natural complexity function has polynomial growth. We compute its exponent α in terms of the ranks of certain groups which appear in the construction. We give bounds for α . The…