Materials Literature
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The objectives of this research are to demonstrate the feasibility of using the cost-effective pultrusion process to manufacture high quality polymeric composites using natural fiber reinforcements (NFR) and to quantify mechanical property variability for these composites. Natural fiber reinforcements offer value adde…
Abstract Composite samples were prepared from Poly(vinyl chloride)/low‐density polyethylene (PVC/LDPE) blend, compatibilized by PA20 (methyl methacrylate‐ co ‐butyl acrylate copolymer), and reinforced by different levels of rubber‐wood sawdust. To improve the mechanical properties of the composites, Silane A‐137 (Octy…
Undoped and transition-metal doped indium tin oxide films have been grown by pulsed laser deposition technique, on single crystalline c-plane (0001) and r-plane (1102) sapphire substrates maintained at 500–850°C. Magnetization measurements of films deposited at different temperatures indicate that ferromagnetism appea…
Abstract Novel biocomposites have been prepared by the free radical polymerization of a tung oil‐based resin using spent germ, the coproduct of wet mill ethanol production, as a filler. The effect of filler particle size, amount of filler, amount of crosslinker, and molding pressure on the resulting composites has bee…
Udgivelsesdato: MARCH 2008
The electronic local density of states (LDOS) of single PbSe quantum dots (QDs) and QD molecules is explored using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Both individual PbSe QDs and molecular aggregates of PbSe QDs (dimers, trimers, etc.) are mechanically stabilized in a two-dimen…
Abstract Molecular simulations are the most important tools to predict the properties of polymers and their blends. In this work, we have predicted the blend incompatibility of poly( n ‐vinyl pyrrolidone) (PVP) and poly(bisphenol‐A‐ether sulfone) (PES). Atomistic simulations were performed to compute the Flory‐Higgins…
In this study, the surface chemical properties of carbon nanotubes (CNTs) and carbon nanofibers (CNFs) grown by catalytic decomposition of methane on nickel and cobalt based catalysts were studied by DRIFT (Diffuse Reflectance Infrared Fourier Transform) and transmission Infrared (IR) spectroscopy. The results show th…
We investigated the atomistic and electronic structure of the 90\ifmmode^\circ\else\textdegree\fi{} domain wall in $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ and the fundamental mechanism of domain switching induced by shear stress using first-principles density functional theory calculations within the local density ap…
Abstract The present investigation deals with the mechanical, thermal and viscoelastic properties of ternary composites based on low density polyethylene (LDPE)‐ethylene–propylene–diene terpolymer (EPDM) blend and high density polyethylene (HDPE)‐EPDM blend reinforced with short jute fibers. For all the untreated and…
The present work addresses a market demand for high refractive index ( n D ) coatings. We prepared organic UV-curable oligomers with n D > 1.6. We found a novel way to prepare sulfur-containing UV-curable high n D oligomers of melamine and urethane acrylates. Refractive indices of the synthesized oligomers were betwee…
Strategies to create thin films using layer-by-layer methods use oppositely charged polymeric polyelectrolytes for both or at least one component to beneficially exploit multitopic electrostatic interactions between the deposited layers with opposite charges. In contrast, the electrostatic deposition of tetracationic…
Folding under pressure: High-pressure crystallography of an Mn6 single-molecule magnet reveals dramatic changes in the intramolecular geometry of the magnetic core (see picture; Mn purple, O red, N blue). These structural changes effect the magnetic properties of the molecule: the magnitude of the ferromagnetic exchan…
We report on a series of experiments in which a Hele-Shaw cell containing aqueous solutions of NH 4 Cl was translated at prescribed rates through a steady temperature gradient. The salt formed the primary solid phase of a mushy layer as the solution solidified, with the salt-depleted residual fluid driving buoyancy-dr…
Cotton, jute, flax, ramie, hemp, sisal, manila hemp, wool, and silk are some of the major natural fibres, which are widely being used throughout the world. Apart from these, a large number of fibres grown in much smaller quantities in different parts of the world have local economic importance and are mostly consumed…
Conventional techniques to measure diffusion coefficients in liquid metals and alloys are hampered by buoyancy-driven convective fluid flow and chemical reactions of the liquids with container material. To overcome these obstacles we combined containerless processing via electromagnetic levitation with quasielastic ne…
The defect structure of hard copper-modified polycrystalline ${\mathrm{PbTiO}}_{3}$ ferroelectrics is investigated by means of electron paramagnetic resonance and hyperfine sublevel correlation spectroscopy, as well as density functional theory calculations. Special emphasis is put on the $^{207}\mathrm{Pb}$-hyperfine…
The potential for magnesia-based cements to improve the mechanical performance upon carbonation was recently identified. Key parameters were defined as drying, concentration and transport of CO 2 into the sample. However, the trials were performed on small-scale samples of cement paste only. Following this an investig…
Abstract Biodegradable thermoplastic‐based composites reinforced with kenaf fibers were prepared and characterized. Poly(lactic acid) (PLA) was selected as polymeric matrix. To improve PLA/fibers adhesion, low amount of a proper reactive coupling agent, obtained by grafting maleic anhydride onto PLA, was added during…
We discuss steady state crack growth in the spirit of a free boundary problem. It turns out that mode I and mode III situations are very different from each other: In particular, mode III exhibits a pronounced transition towards unstable crack growth at higher driving forces, and the behavior close to the Griffith poi…