Materials Literature
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There are strong research programs in nanotechnology related to chemical sensors, electromechanical devices, actuators, biosensors, etc. in leading laboratories across the world. In many cases, practical systems demand seamless integration of the nanodevice with higher order structures, for example, MEMS. Examples of…
The objective of this study was to determine the chemical stability of tetracycline and oxytetracycline hydro-chlorides in reverse micelles. Their reverse micellar solutions were prepared using cetyltrimethylammonium bromide, water and ethyl formate. The aqueous solutions of the tetracycline antibiotics were also prep…
To obtain high transmittance and reflectance simultaneously, a single cell gap transflective liquid crystal (LC) display using internal wire grid polarizer (WGP) is proposed. For the reflective mode, the imbedded WGP serves as a polarization-dependent reflector for the ambient light. For the transmissive mode, no achr…
By using a combinatorial screening method based on the self-consistent field theory (SCFT) for polymers, we have investigated the morphology of H-shaped ABC block copolymers (A2BC2) and compared them with those of the linear ABC block copolymers. By changing the ratios of the volume fractions of two A arms and two C a…
Abstract Crystallization in a series of variable crosslink density poly(dimethyl‐diphenyl)siloxanes random block copolymers reinforced through a mixture of precipitated and fumed silica fillers has been studied by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), nuclear magnetic resonance (N…
The paper presents a study into the potentials and electric field distribution on insulator strings, which are used for suspension of overhead transmission lines of 400 kV and are stressed by power frequency voltage. The investigated insulator strings are used by the Public Power Corporation of Greece in high voltage…
Abstract The gas concentration and pressure effects on the shear viscosity of molten polymers were modeled by using a unified approach based on a free volume theory. A concentration and pressure dependent “shift factor,” which accounts for free volume changes associated with polymer‐gas mixing and with variation of ab…
Optical second harmonic generation (SHG) from molecular crystals is largely controlled by the molecular hyperpolarizability and the relative disposition of the molecules in the crystal lattice. Even though it is known that intermolecular interactions can modify the bulk SHG, strong and direct influence of such effects…
The microphase separation in a supramolecular comb−coil block copolymer formed by the stoichiometric complexation of an amphiphilic surfactant, dodecylbenzenesulfonic acid (DBSA), with the poly(2-vinylpyridine) (P2VP) blocks in a nonlinear heteroarm (PS) 5 (P2VP) 5 star copolymer has been investigated. The hierarchica…
The ability of the dinuclear Co(II) complex [(L(Me))Co(II)2(mu-Cl)]+ [1; (L(Me))2- = 3,6,9,17,20,23-hexamethyl-3,6,9,17,20,23-hexaaza-29,30-dithiol-13,27-di-tert-butyltricyclo[23.3.1(11.15)]triaconta-1(28),11,13,15(30),25,26-hexaene] to bind tetrahedral oxoanions of the transition metal has been investigated. Two new…
Why is it so hard to lift a wet glass from a table? Is it easier when there is whiskey between the glass and the table? Macroscopically, the picture is quite simple: two surfaces have to be disrupted that are connected indirectly through hydrogen bonds and/or van der Waals forces. In the beginning, a surface has to be…
Hyperbranched polyethylenimine (PEI) is covalently grafted to the surface of polyethylene (PE) particles in an effort to promote the growth of conductive thin films deposited using layer-by-layer (LbL) assembly. Growth of the grafting process is monitored with infrared spectroscopy and titration. LbL films are then de…
Molecular dynamics simulation (MDS), using the embedded atom method for interatomic interactions, is performed to reveal the microscopic mechanism of stress-induced martensitic transformation of Ni–Ti alloys. Stress-induced martensitic transformation was observed for tensile simulation using four different strain rate…
Reduced layered M(C4H4N2)V4O10 ((I, M = Co; II, M = Ni; III, M = Zn); C4H4N2 = pyrazine, pyz) hybrid solids were synthesized via hydrothermal reactions at 200-230 degrees C, and their structures determined by single-crystal X-ray diffraction (Cmcm, No. 63, Z = 4; a = 14.311(2), 14.2372(4), 14.425(1) A; b = 6.997(1), 6…
The Stator winding insulation is aged by exposure to a combination of thermal, electrical, mechanical, and environmental stresses. Diagnosis of stator winding insulation is an important measure of ensuring the safe operation and extending the remaining life of large generator. In the paper, two new parameters are prop…
We have investigated systematically the mechanistic aspects of the Ag-Pd bimetallic cluster formation within sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles by using in-situ X-ray absorption spectroscopy (XAS). A two-step sequential reduction method is employed for the synthesis of Ag-Pd bimetallic clust…
We studied the algal community of the Great Salt Plains (GSP), an expansive (65 km 2 ) salt flat situated in north‐central Oklahoma, USA that has been designated as the Salt Plains Microbial Observatory (SPMO) by the National Science Foundation. The GSP offered a unique opportunity to study a terrestrial, hypersaline…
Cytochrome c functions as an electron carrier in the mitochondrial electron-transport chain using the Fe(II)-Fe(III) redox couple of a covalently attached heme prosthetic group, and it has served as a paradigm for both biological redox activity and protein folding. On the basis of a wide variety of biophysical techniq…
High-speed polymer modulators were fabricated using low-VpiAJL8 chromophore in amorphous polycarbonate, and highly calibrated frequency response measurements were obtained using convenient coplanar-microstrip transitions. These Mach-Zehnder modulators show good frequency response to 50 GHz, with a loss and velocity mi…
This paper presents the results obtained using a genetic algorithm (GA) to search for stable structures of medium-size silicon clusters. This is the third report in which a GA coupled with the MSINDO semiempirical molecular orbital program is used to find stable atomic cluster structures. The structures selected by th…