Materials Literature
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Shape memory alloys (SMA) are able to provide high work output when they undergo the martensitic transformation. Therefore, they present a favorable actuation mechanism for microsystems, e.g. for microvalves, switches or microgrippers. Sputter deposited thin SMA films are already in use as free-standing films or as co…
We present a theoretical study of the Larmor frequency dependence of the nuclear spin-lattice relaxation caused by order director fluctuations for both nematic and smectic-A mesophases. The analysis is focused on the case where the molecular system is subjected to sonication during the relaxation process. The departur…
Abstract Crosslinked poly(butyl acrylate‐ co ‐2‐ethylhexyl acrylate) [P(BA–EHA)] latex was synthesized by seeded emulsion polymerization. P(BA–EHA)/poly(vinyl chloride) (PVC) composite latex was prepared using P(BA–EHA) latex as the seed. The effects of the amount of P(BA–EHA) on the latex particle diameters and mecha…
Single crystal specimens of Fe-17 at. % Ga were tested in tension at room temperature. Specimens with a tensile axis orientation of [110] displayed slip lines on the specimen faces corresponding to slip on the {110}<111> with a critical resolved shear stress of 220 MPa. Yielding began at 0.3% elongation and 450 MPa. A…
The elasticity of both the austenite and martensite states of a NiMnGa Heusler alloy was investigated by using a continuous wave method. A magnetic field was used to detwin the martensite. The symmetrized elastic constants of both austenite and martensite were determined by exiting different modes of wave propagation.…
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…