Materials Literature
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Cryptomelane-type manganese dioxide (K-MnO 2 ) nanofibers with typical diameters of 20−60 nm and lengths of 1−6 μm were prepared by reacting KMnO 4 with MnSO 4 under hydrothermal conditions. Rietveld refinement from synchrotron X-ray powder diffraction data showed that the K-MnO 2 nanofibers crystallize in a body-cent…
The air electrode, which reduces oxygen (O2), is a critical component in energy generation and storage applications such as fuel cells and metal/air batteries. The highest current densities are achieved with platinum (Pt), but in addition to its cost and scarcity, Pt particles in composite electrodes tend to be inacti…
CaFe2As2 has been found to be exceptionally sensitive to the application of hydrostatic pressure and can be tuned to reveal all the salient features associated with FeAs superconductivity without introducing any disorder. The ambient pressure, 170 K, structural/magnetic, first-order phase transition is suppressed to 1…
The catalytic properties of gold nanoparticles are determined by their electronic and geometric structures. We revealed the geometries of several small neutral gold clusters in the gas phase by using vibrational spectroscopy between 47 and 220 wavenumbers. A two-dimensional structure for neutral Au7 and a pyramidal st…
Nanotechnology is a rapidly growing science of producing and utilizing nano-sized particles that measure in nanometers. These nanomaterials are already having an impact on health care. Now-a-days we are using nanoproducts in various fields. Of these, silver nanoparticles are playing a major role in the field of nanote…
Because of their wide abundance, their renewable and environmentally benign nature, and their outstanding mechanical properties, a great deal of attention has been paid recently to cellulosic nanofibrillar structures as components in nanocomposites. A first major challenge has been to find efficient ways to liberate c…
The search for electrolyte materials with high oxygen conductivities is a key step toward reducing the operation temperature of fuel cells, which is currently above 700 degrees C. We report a high lateral ionic conductivity, showing up to eight orders of magnitude enhancement near room temperature, in yttria-stabilize…
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Two series of symmetric ester liquid crystals (nAFBHQ and nADFBHQ) with lateral fluorine atoms have been synthesized. Their chemical structures were measured by FTIR, 1H NMR, and elemental analysis (EA). Their mesomorphic properties were investigated by differential scanning calorimetry (DSC) and polarizing optical mi…
The influence of the polymer network density formed in short pitch ferroelectric liquid crystal on the electroclinic effect has been analyzed. The polymer network is formed from a photo-reactive achiral monomer in a thin planar S c * cell. Using an electro-optic response technique, the electric field dependance of the…
The title mol-ecule (systematic name: 12-O-β-tigloyl-3β,14β-dihydroxy-pregn-5-en-20-one), C(26)H(38)O(5), isolated from aerial parts of Hoodia gordonii, has its steroid A and C rings in chair conformations, its B ring in a half-chair conformation, and its five-membered ring in an envelope conformation. The OH group at…
Abstract Electrochemical preparation of the Prussian blue (PB)/poly (N‐acetylaniline) (PNAANI) composite film was carried out by cyclic voltammetry (CV). Its surface morphology, which was evaluated by Atom Force Microscope (AFM), revealed that PNAANI film provides lots of redox centers for PB growth so that the electr…
Abstract Low density polyethylene (LDPE) and its blends with styrene butadiene rubber and ethylene propylene diene monomer were cured, using electron beam irradiation as well as dicumyl peroxide (DCP). The effect of blending was found to change the melt viscosity when compared with the virgin LDPE. Also, the influence…
Mechanical performance parameters such as the fatigue strength, tensile strength, ductility and Young's modulus of newly developed Ti -29 Nb -13 Ta -4.6 Zr , referred to as TNTZ, can be improved considerably by microstructural control via thermomechanical processing. Thermomechanical processing including severe cold w…
Creep and superplasticity of the fine-grained Sn -1wt.% Bi alloy, processed by conventional rolling (CNR), cryorolling (CRR) and equal channel angular pressing (ECAP) routes, were investigated by indentation testing at room temperature (T > 0.6T m ). Based on the steady-state power law creep relationship, the stres…
This work conducted to investigate the effects of accumulative roll bonding (ARB) method on achieving the ultra-fine grain microstructure in AZ31 alloy. Accordingly, a number of ARB routes at 400°C, applying thickness reductions per pass of 35%, 55%, and 85% were performed. The results indicate that both the final gra…
Ultra-fine grained 1100 Al alloy was successfully produced by accumulative roll bonding (ARB) process. TEM investigation and SAD patterns showed that, after eight cycles of ARB, sheets were found to contain ultra-fine grains with high angle grain boundaries. The mechanical properties of the ARB processed (ARBed) 1100…
Abstract Polyamide 6 (PA6)/maleated ethylene–propylene–diene rubber (EPDM‐ g ‐MA)/organoclay (OMMT) composites were melt‐compounded through two blending sequences. Glycidyl methacrylate (GMA) was used as a compatibilizer for the ternary composites. The composite prepared through via the premixing of PA6 with OMMT and…
Ce 3+ ‐doped yttrium aluminum garnet (Ce:YAG) phosphor powders were synthesized by heterogeneous precipitation process using three different aluminum sources: α‐phase, θ‐phase, and boehmite (AlOOH). Mixtures of yttrium and cerium nitrate solutions containing various aluminum sources were precipitated by ammonia soluti…
Series of nonsymmetric 4-ethyl- and 4-fluoroanilinebenzylidene-2′,4′-oxy-bis(4″-halogenoanilinebenzylidene-4″′oxy)alkanes trimers have been synthesized and characterized. Every member in this series possesses either Cl or Br terminal atoms. The molecular structure of these novel trimers is composed of six aromatic rin…