Materials Literature
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We study segregation patterns in a hard-sphere binary model under gravity subject to sequences of taps. We discuss the appearance of the "Brazil nut" effect (where large particles move up) and the "reverse Brazil nut" effects in the stationary states reached by "tap" dynamics. In particular, we show that the stationar…
Abstract The colored isomer produced in 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene crystal upon irradiation with ultraviolet light showed an absorption maximum at 535 nm, which is 30 nm longer than that in hexane, 505 nm. The spectral shift is ascribed to the strained structure of the photogenerated closed-r…
To implement surface-enhanced Raman spectroscopy as a practical detection method, highly enhancing, stable, and reproducible substrates need to be fabricated in an efficient manner, and their performance in different solution environments should be well characterized. In this work structured porous gold films have bee…
Abstract PVC‐clay nanocomposites have been prepared by solution blending of the polymer with both sodium montmorillonite and an organically modified clay. The nanocomposites have been characterized by X‐ray diffraction and transmission electron microscopy; in all cases the materials are best described as mixed immisci…
In the present study, the room‐temperature properties of Al 2 O 3 ‐Ti 3 SiC 2 composites with different Ti 3 SiC 2 contents are determined. The composites are prepared by attrition milling Al 2 O 3 and Ti 3 SiC 2 mixture powders followed by spark plasma sintering (SPS) under vacuum. From a closer examination of the de…
A three-step strategy to synthesize well-defined amphiphilic poly[( R, S )-β-malic acid- b -ε-caprolactone] diblock copolymers (P(MLA- b -CL)), which combines the anionic polymerization of benzyl β-malolactonate (MLABz) with the coordination−insertion ring-opening polymerization (ROP) of ε-caprolactone (CL), followed…
The photoinduced charge separation between a photosensitizer, 5,10,15,20-tetrakis-( N -methyl- pyridinium-4-yl)21H,23Hporphyrin cation (TMPyP 4+ ), and an electron acceptor, methyl viologen (MV 2+ ), intercalated in the different layer sheets of titanoniobate (TiNbO 5 - ) and successively cast on a SiO 2 glass slide h…
A model was developed to investigate the corrosion of a coated pipeline surface in a thin, narrow channel crevice formed between the pipe surface and the coating. Such crevices are often found on natural gas pipelines when the coating is high-density polyethylene (HDPE). Imposed cathodic protection current passage thr…
Exposure of vascular cell-seeded, tubular, biodegradable polymers to pulsatile flow conditions has been proposed as a method to develop tissue-engineered blood vessels by "maturing" structural integrity, and increasing collagen content, suture retention, burst pressure, and tissue formation. These in vitro tissue-engi…
Abstract Anisotropic susceptibilities of feeble magnetic ceramics such as zinc oxide are quite small; therefore, it had been difficult to control the textured microstructures of these ceramics using a magnetic field. However, fabrication of the textured ZnO is achieved by slip casting in a strong magnetic field follow…
Article Redetermination of the crystal structure of mercury chlorothiocyanate, HgClSCN was published on December 1, 2002 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 217, issue JG).
Abstract Semi-crystalline polymers like syndiotactic polypropylene pass during tensile deformation different stages with cross-overs at four critical points. Temperature variation above ambient changes the stresses at the critical points, but leaves the strains constant. Cooling down to the glass transition leads to t…
The effects of γ-rays (20–160 Mrad) on the surface and catalytic properties of two Co 3 O 4 /MgO systems were investigated. The formulae of the investigated solids were 0.05Co 3 O 4 /MgO and 0.2Co 3 O 4 /MgO, respectively, both prepared by the impregnation method and calcined at 500°C. The irradiated samples were left…
Abstract Phase separation occurs in thin films of polymer blends when molecular mobility is promoted by a temperature above the glass transition but inside the twophase region (temperature quench), or a common solvent added to the polymers (solvent quench). This phenomenon can be altered by a homogeneous surface or pr…
The lens design problem for the 2002 IODC is to design a 100 mm focal length, f/8 all refractive system which simulates the chromatic behavior of a diffractive optical element. The lenses must be all spherical and be made of Schott glasses only. There is no restriction on the number of lenses, the design form, or the…
Abstract A review of the results obtained for the birefringence of different supermolecular structures of three polymorphic forms of polypropylene is presented. All known lamellar super-molecular formations of the monoclinic, hexagonal and triclinic phases are included. The observed morphology varies among negative he…
In nonwovens, fiber orientation is an important characteristic as it directly influences the properties of the material. Fiber orientation is an important structural characteristic. In modeling the performance of nonwovens, it is desirable to understand the impact of fiber orientation and anisotropy on performance. Wi…
Thin chalcogenide films of GexFex Se100-2x (x= 2.5,5,10 and 15 at.%) withthickness about ≈ 300 nm, have been prepared by thermal evaporationtechnique. A.C. conductivity σa.c. (ω) of the prepared thin films has beenmeasured in the frequency range (0.1-20 K Hz), over the temperaturerange(300-345 K).Obtained data reveal…
Abstract Stress‐whitening and its healing phenomena in polypropylene under tensile load superposed on hydrostatic pressure up to 89.7 MPa have been investigated. Tensile samples of polypropylene were first cold‐drawn beyond the yielding at atmospheric pressure to develop stress‐whitening, and the stress‐whitened sampl…
The derivation of a bond-order potential energy function and a self-consistent tight-binding scheme is presented, followed by a survey of the application of these methods to calculating properties of carbon nanostructures. The modeling studies discussed include properties of functionalized and kinked carbon nanotubes,…