Materials Literature
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The properties of a polymer are strongly influenced by its morphology. In the case of fibers from semi-crystalline polymers this consists of the degree of crystallinity, the spacing and alignment of the crystalline regions, and molecular orientation of the polymer chains in the amorphous regions. Information on crysta…
A fibre-level model for the longitudinal absorption of liquid water in wood has been developed. The model is primarily intended for simulation of absorption in softwoods. Capillary suction is based on the lumen radius, which is a stochastic parameter. The average lumen volume (and thus radius) is assumed to vary linea…
Steady State Isotopic Transient Kinetic Analysis (SSITKA) experiments using on-line Mass Spectrometry (MS) and in situ Diffuse Reflectance Infrared Fourier-Transform Spectroscopy (DRIFTS) have been performed to study essential mechanistic aspects of the Selective Catalytic Reduction of NO by H2 under strongly oxidizin…
In order to clarify the mechanism of electrical-tree inception and propagation from a water tree within polyethylene, we have investigated temperature dependence of water tree and electrical tree inception and propagation from water-tree degradation. In the samples with water tree of the area above ca. 5000 mum2, the…
The combustion behavior of polypropylene (PP) composites containing intumescent flame retardant additives, i.e., melamine pyrophosphate (MPP) and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane (PEPA) was characterized by limiting oxygen index (LOI), UL 94 and the cone calorimeter. It has been found t…
A three-dimensional finite element models for phase change random access memory (PCRAM) is established to simulate thermal and electrical behaviours during RESET operation. The RESET behaviours of the conventional structure (CS) and the ring-type contact in bottom electrode (RIB) are compared with each other. The simu…
Abstract We investigate effects of electric current on formations of beads in electrospinning by changing an electric conductivity of a poly(vinyl alcohol) (PVA) aqueous solution and spinning conditions, such as applied voltage, distance between a tip of needle and a collector, and relative humidity. From the results…
Transition-metal hydrogen maleates of composition M(C 4 H 3 O 4 ) 2 · 4H 2 O, where M = Mn, Fe, Co, and Ni, and their solid solutions were synthesized and characterized by X-ray crystallography, IR spectroscopy, mass spectrometry, and thermal analysis. X-ray crystallography and IR spectroscopy showed that both intramo…
Two ferroelectric three‐ring chiral esters, one with a partially fluorinated alkyl chain and another with a cyano terminal group, were mixed with a structurally similar compound having an alkyl terminal chain. In their mixtures an antiferroelectric phase was induced. The phase behaviour, spontaneous polarisation, tilt…
Porous glass beads with a core‐shell structure have been successfully prepared through subcritical water treatment. The product has high capacity and fast mass transfer property due to its structure, and may serve as an inorganic adsorbent. Accordingly, the kinetics, the equilibrium isotherm, and the column breakthrou…
We simulate hot optical phonon decay in small diameter (<0.7 nm) carbon nanotubes, solving the phonon Boltzmann transport equation using Monte Carlo methods incorporating the full phonon spectrum and phonon-phonon scattering. Results indicate decay times inversely proportional to the lattice temperature with ne…
The increase in depolarization temperature induced by the poling of (Li x Na 1- x )NbO 3 ceramics having an Li concentration of x = 0.08 (LNN8) was studied. Initially, the Curie temperature T C was measured to be approximately 300 °C, and it increased after the application of poling at high electric fields; this incre…
Molecular dynamics simulations are used to characterize ferroelectricity on the (001) surfaces of PbTiO 3 (PT), one of the most widely studied ferroelectric materials. Two different empirical interatomic shell model potentials are used. Both PbO and TiO 2 surface terminations in PT under open circuit electrical bounda…
We report the amorphization induced high magneto-caloric effect (MCE) of recently developed Gd 55 Al 15 Ni 30 bulk metallic glass (BMG). The magnetic properties of the Gd 55 Al 15 Ni 30 BMG are investigated in comparison with that of its crystalline counterpart. It is found that amorphization can increase the saturati…
Cathodoluminescent and electrical properties of an individual ZnO nanowire with oxygen vacancies, He Xiao-Bo, Yang Tian-Zhong, Cai Jin-Ming, Zhang Chen-Dong, Guo Hai-Ming, Shi Dong-Xia, Shen Cheng-Min, Gao Hong-Jun
The resistance of austenitic stainless steel to intergranular corrosion (IGC) varies during the process of aging at temperatures between 500 and 700°C. This follows the well-known phenomena of precipitating of M 23 C 6 chromium carbides and intermetallic phases (η, σ, χ). Consequently, this leads to significant Cr-dep…
First principles total energy calculations were carried out to investigate structural and electronic properties of zinc blende-type AlN, BN and BxAl 1−x N solid solutions. We have calculated the lattice parameters, bulk modulus, pressure derivative, and BxAl 1−x N band-gap energy for zinc blende-type crystals of the c…
Adsorbed natural gas has various advantages and is relatively more economical than liquefaction and compression. Carbon nanotubes can be introduced as a new candidate for natural gas storage. In this study, adsorption of methane was firstly studied on the as-prepared multi-walled carbon nanotubes, and then chemical an…
The quick equalization technology of ultra-capacitor stacks in series can protect ultra-capacitors and make full use of limited capacitance. Ultra-capacitorpsilas high specific power and charging current require a higher equalization speed. Therefore a method related with buck-boost conversion for switched capacitorsp…
Molecular chirality plays an important role in the science of liquid crystals, leading to cholesteric liquid crystal, blue phases, ferroelectric and antiferroelectric smectic phases and twist grain boundary phases. In all of these mesogens, chirality is an intrinsic property built into the chemical structure of mesoge…