Materials Literature
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Abstract This work examined the miscibility, crystallization kinetics, and melting behavior of melt‐mixed poly(trimethylene terephthalate) (PTT)/poly(ethylene‐ co ‐cyclohexane 1,4‐dimethanol terephthalate) (PETG) blends. Differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction techniques were used to a…
NiMnGa thin films have been deposited by magnetron sputtering on Mo substrates using a Ni<sub>50</sub>Mn<sub>30</sub>Ga<sub>20</sub> powder metallurgical target. Independent from variation of substrate temperature during the sputtering process the deposited films are found to be polycrystalline. X-ray diffraction patt…
This article reports ab initio Fermi surfaces and conduction-band calculations of both stoichiometric and oxygen-reduced ${\mathrm{MoO}}_{3}.$ The data, based on a TB-LMTO approach in LDA, provide a convincing and detailed interpretation of the one-electron removal XPS valence bands, where a clear energy gap is observ…
I report first principle density-functional calculations that demonstrate an insulator-metal transition based on the bending of covalent bonds in 1,3,5-triamino-2,4,6-trinitrobenzene, an organic molecular crystal. The critical shear angle responsible for the vanishing of the energy band gap is achieved at near constan…
Abstract Several kinds of homogeneous organic–inorganic hybrid polymer thin films were designed with improved mechanical properties and low dielectric constants (<3.0). Novel soluble siloxane–silsesquioxane hybrid polymers were synthesized with cyclic and/or cage silane monomers, which had triorganosiloxy (R 3 Si 1…
Tunneling spectroscopy measurements of single tunnel junctions formed between multiwalled carbon nanotubes (MWNTs) and a normal metal are reported. Intrinsic Coulomb interactions in the MWNTs give rise to a strong zero-bias suppression of a tunneling density of states that can be fitted numerically to the environmenta…
Two groups of polymers that have been the focus of widespread research are hydrogels and conducting electroactive polymers (CEPs). 'Intelligent' hydrogels are highly hydrophilic, cross-linked polymers possessing hydration properties that change in response to specific environmental stimuli such as pH, ionic strength,…
Abstract Temperature modulated differential scanning calorimetry (TMDSC) was employed to study the melting and crystallization behavior of various polyethylenes (PEs). Samples of high density PE (HDPE), low density PE (LDPE), linear low density PE (LLDPE), and very low density PE (VLDPE) with different crystal structu…
By addition of small amount of Nb and C to the conventional Fe-Mn-Si based shape memory alloys, shape memory properties are greatly improved in such an extent that the costly 'training' heat treatment is no more necessary. The key to this remarkable improvement of shape memory effect is to produce small NbC precipitat…
Various defect sites on SiO 2 thin films on Mo(112) have been characterized with metastable impact electron spectroscopy (MIES), and the interaction between deposited Ag and these defects sites investigated with MIES/ultraviolet photoelectron spectroscopy (UPS). MIES/UPS data for low- and high-defect SiO 2 surfaces ac…
A new luminescent material, SrZnO2:Ba2+, Mn2+, emitted yellow color, and the emission peak shifted to a longer wavelength with the Mn2+ concentration. Therefore, the relation between the crystal structure and emission property was discussed.
Magnetic shape memory materials are expected to have a high potential in practical applications. Several ferromagnetic materials exhibiting the large magnetic-field-induced strain have been found in recent years. The largest field-induced strain is observed in Ni-Mn-Ga system. The most important experimental results o…
Abstract The basic technology for forming crosslinked elastomers by the end linking of low molecular weight hydroxyl‐terminated poly(dimethylsiloxane) (PDMS) with tetraethoxysilane (TEOS) was modified to make it suitable for preparing coatings for controlled drug release. The requirements for this application included…
The glass transition of a hard sphere system is investigated within the framework of the density functional theory (DFT). Molecular dynamics (MD) simulations are performed to study the dynamical behavior of the system on the one hand and to provide the data to produce the density field for the DFT on the other hand. E…
This paper presents a study on the fatigue life of shape memory alloy actuators undergoing thermally induced martensitic phase transformation under various stress levels. A microstructural study characterizing specific damage patterns is conducted in the current work. A highly stressed state with formation of differen…
Dielectric relaxation measurements have been used to study the crossover in dynamics with temperature and pressure, onset of breakdown of the Debye-Stokes-Einstein law, and the relation between the \ensuremath{\alpha} and the \ensuremath{\beta} relaxations in diethyl phthalate. The measurements made over 10 decades in…
Abstract The thermal stability of vulcanizates of low‐density polyethylene (LDPE), poly(dimethyl siloxane) (PDMS) rubber, and their blends was studied by nonisothermal thermogravimetry. Four ethylene copolymers [ethylene methyl acrylate (EMA), ethylene vinyl acetate, ethylene acrylic acid, and a zinc‐salt‐based ionome…
The temperature-dependent deformation behavior of amorphous thin films of poly(1,4-cyclohexylenedimethylene terephthalate) (PCT), poly(ethylene terephthalate) (PET), and their copolymers was examined with variation of temperature and cyclohexylene linkage content by transmission electron microscopy. When subject to un…
Abstract Supertough poly(butylene terephthalate) (PBT)‐based blends were obtained by the melt blending of PBT with 0–30 wt % poly(ethylene‐ co ‐glycidyl methacrylate) (EGMA). The reaction between PBT and EGMA was detected by torque measurements. The particle size was almost constant with increasing EGMA content, and t…
A room-temperature wet chemical method of synthesis for sphere- and rod-shaped magnetic “solid solution” type Ni−Pt nanoparticles in cetyltrimethylammonium bromide (CTAB) micelle is reported. The particles have been found to be moderately monodispersed without adopting any further size-selection procedure. The composi…