Materials Literature
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This article presents Fourier transform and wavelet packet analysis of stress waves in a split Hopkinson pressure bar apparatus where the compressive behaviors of 3-D angle-interlock woven composite were tested at strain rate of 800/s, 1600/s and 2100/s. The stress waves in incident and transmission bar are transforme…
This work reports a detailed study of the temperature dependence of the lattice dynamics of single crystal sodium ammonium sulphate dihydrate (SASD) obtained from polarized Raman scattering. The phase transitions in SASD are marked by the appearance of new weak bands and anomalies in the temperature dependence of wave…
A simple approach that allows cost-effective automated purification of recombinant proteins in levels sufficient for functional characterization or structural studies is described. Studies with four human stem cell proteins, an engineered version of green fluorescent protein, and other proteins are included. The metho…
Abstract The thermodegradation kinetics of a hybrid inorganic–organic epoxy system formed by diglycidyl ether of bisphenol A, DGEBA/DDS, modified with octahedral oligomeric silsesquioxane, octa(aminopropylsilsesquioxane) was studied. The average activation energy of thermodegradation of this system was calculated by t…
A simple expression has been derived for the prediction of the creep rate controlled by electromigration-induced grain boundary diffusion. The creep rate depends linearly on the current density and the grain boundary diffusivity, and inversely on grain size squared. It is also demonstrated that the electromigration-in…
Abstract Polyaniline‐phosphate polymer was prepared chemically by oxidation polymerization of aniline in phosphoric acid medium using ammonium persulphate. The PANI‐phosphate polymer was characterized by FTIR, XRD, and SEM. The paints using PANI‐phosphate as pigment in acrylic and epoxy binder were prepared. The prote…
Abstract Itaconate‐unit‐containing poly(butylene succinate) (PBSI) was synthesized by the reaction of 1,4‐butanediol, succinic acid, and itaconic acid in a molar ratio of 2.0 : 1.0 : 1.0, and the obtained PBSI was reacted with methacryl‐group‐substituted polysilsesquioxane (ME‐PSQ) in the presence of benzoyl peroxide…
Polyurethane networks with enhanced thermal stability and electrical insulation properties were prepared from the reaction of epoxy-terminated urethane prepolymers (EPU) and polyimides containing pendant phenol groups (HPI). EPUs were prepared by the reaction of glycidol with NCO-terminated urethane oligomers. The oli…
Abstract The metal complexes of N , N ′‐bis ( o ‐hydroxy acetophenone) propylene diamine (HPPn) Schiff base were supported on cross‐linked polystyrene beads. The complexation of iron(III), copper(II), and zinc(II) ions on polymer‐anchored HPPn Schiff base was 83.4, 85.7, and 84.5 wt%, respectively, whereas the complex…
Abstract Dynamic‐strain softening known as the Payne effect was investigated in the case of poly(vinyl acetate)‐hydroxyapatite (PVAc‐HA) model nanocomposites in which the nanoparticles served as reversible physical cross‐links. HA nanofillers with different particle shape and with size ranging from 5 to 60 nm were use…
In an attempt to overcome the technical challenges in the conventional solution-processed near infrared (NIR) photodetectors, we have used NaYF4:Yb, Er upconversion fluorescence nanocrystals to replace the semiconductor quantum dots in conjugated polymers. Under NIR excitation, the NaYF4:Yb, Er nanocrystals emit visib…
We present results of measurements of the conductance and dielectric permittivity at various cooling and heating rates through the phase transition into the charge-ordered state in $\ensuremath{\theta}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{Rb}\mathrm{Zn}{(\mathrm{S}\mathrm{C…
A straightforward and effective method for the fabrication of double-length-scale patterned (i.e., composite micro- and nanopatterned) carbon nanotube (CNT) arrays can be achieved by block copolymer templating on a prepatterned conducting substrate followed by electroplating to deposit Ni (see figure). Significant imp…
A novel fiber-oriented scattering polarizer is prepared by infiltrating liquid crystal into an aligned-fiber film (schematically shown in the figure), which is fabricated by using an optimized strategy of anisotropic electrospinning. The new-style polarizer has a high polarizing efficiency, is simple to fabricate and…
Abstract Thermoplastic chitosan/natural rubber blends (Cs/NR) were prepared from natural rubber latex and chitosan by solution casting technique. The blends were characterized by mechanical analysis (stress–strain) and the mechanical properties were found to vary with chitosan/natural rubber ratios. Experimental value…
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The Ba0.6Sr0.4TiO3 (BST)/poly(methyl methacrylate) (PMMA) tunable composites in 1-3-type structure consisting of BST rods in low-permittivity PMMA matrix are fabricated by dice and fill technique. For the composite containing 41.6vol% BST, the permittivity and the loss tangent of the composite are 1212 and 0.026 at 10…
High-quality CdS nanowires with wurtzite structure were produced by thermal evaporation of CdS powder. The nanowires were core-shell structures, consisting of crystalline core and amorphous/polycrystal shell. The intensity of the second-order longitudinal phonon mode in the Raman spectrum of the CdS nanowires is highe…
Abstract Two series of melt‐processable polyimides were prepared from 4,4′‐bis(3‐amino‐5‐trifluoromethylphenoxy)biphenyl ( m ‐6FBAB) and 4,4′‐bis(4‐amino‐5‐trifluoromethylphenoxy) biphenyl ( p ‐6FBAB) with various aromatic dianhydrides. The effects of the chemical structures of the polyimides on their properties, espe…
The viscosity of melts in the Na 2 O-CaO-Al 2 O 3 -SiO 2 system follows the same trend as a function of composition as that observed in the Na 2 O-Al 2 O 3 -SiO 2 system; in that there is a local maximum in viscosity at the condition Na 2 O+CaO ~Al 2 O 3 . This is despite the difference in charge of Na + and Ca 2+ , t…