Materials Literature
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We present a novel direct‐foaming method to produce macroporous ceramics using particles instead of surfactants as stabilizers of the wet foams. This method allows for the fabrication of ultra‐stable wet foams that resist coarsening upon drying and sintering. Macroporous ceramics of various chemical compositions with…
Abstract Natural rubber was reinforced with sisal and oil palm fibers and was subjected to dynamic mechanical analysis to determine the dynamic properties as a function of temperature. The storage modulus E ′ was found to increase with weight fraction of fiber. This is due to the increased stiffness imparted by the na…
We reconstituted type I collagen nanofibers prepared by electrospin technology and examined the morphology, growth, adhesion, cell motility, and osteogenic differentiation of human bone marrow-derived mesenchymal stem cells (MSCs) on three nano-sized diameters (50-200, 200-500, and 500-1,000 nm). Results from scanning…
Abstract Cryoadsorption is a promising method of enhancing gravimetric and volumetric onboard H 2 storage capacity for future transportation needs. Inexpensive carbide‐derived carbons (CDCs), produced by chlorination of metal carbides, have up to 80 % open‐pore volume with tunable pore size and specific surface area (…
Simultaneous increase of the ductility and strength of bulk ultra-fine-grained (UFG) Cu is achieved by introducing large amounts of deformation twins and high-angle grain boundaries via cryodrawing and cryorolling (red plots and image). Bulk UFG materials usually have high strength but disappointingly low ductility. M…
We report the shape and size control of polyhedral gold nanocrystals by a modified polyol process. The rapid reduction of gold precursors in refluxing 1,5-pentanediol has successfully provided a series of gold nanocrystals in the shape of octahedra, truncated octahedra, cuboctahedra, cubes, and higher polygons by incr…
Abstract IR‐to‐visible up‐conversion fluorescent nanocrystals of hexagonal‐phase NaYF 4 :20 %Yb,2 %Er and NaYF 4 :20 %Yb,2 %Tm have been synthesized by decomposition of multiprecursors of CF 3 COONa, (CF 3 COO) 3 Y, (CF 3 COO) 3 Yb, and (CF 3 COO) 3 Er/(CF 3 COO) 3 Tm in oleylamine at 330 °C. The average particle size…
Abstract The ability to pattern materials in three dimensions is critical for several technological applications, including composites, microfluidics, photonics, and tissue engineering. Direct‐write assembly allows one to design and rapidly fabricate materials in complex 3D shapes without the need for expensive toolin…
Abstract Polyurethane (PU) with lactate structures in its conformation can be used as a biological and biodegradable polymer. Polyurethane lactate (PUL) was doped with small quantities of an erbium (Er 3+ ) complex, which hindered the NN group. 2,2′‐Dihydroxyazobenzene was used as a ligand for the Er 3+ complex. PUL…
We present a new wave separation method to enable the split Hopkinson pressure bar (SHPB) technique to break through the limitation of the length of the incident bar and greatly to increase its measurable maximum strain. At the same time the dispersion effect of the elastic wave is significantly reduced. The fundament…
Boron-doped amorphous graphite-like carbon (GLC) films have been prepared with different boron concentrations. Electrical transport measurements in the temperature range 1.3–300 K on the films shows a doping-induced metal–insulator (MI) transition. On the metallic side of the transition, the experimental data are inte…
Comparison of the collision cross-section of the [Fe(III)-protoporphyrin IX]+ ion, hemin+, measured by means of ion-mobility experiments and the cross-sections calculated from theoretical structures based on density functional theory reveals that hemin+, in the gas phase, contains intramolecular hydrogen bonding betwe…
First-principles density functional studies of the dynamical properties of the conjugated polymers polyaniline and poly($p$-pyridyl vinyline) are presented in this work. We have employed linear response within density functional perturbation theory, as implemented in the CASTEP code, to investigate the Born effective…
Abstract The kinetics of the thermal degradation of polyurethane (PU) elastomers based on poly(ether polyol) soft segments and an aromatic type of diisocyanate were investigated by thermogravimetric analysis (TGA) under a nitrogen atmosphere employing four heating rates. The corresponding kinetic parameters of the two…
Extraordinary effects of the hydrostatic pressure on the crystallographic and magnetic properties of the ${\mathrm{Er}}_{5}{\mathrm{Si}}_{4}$ alloy have been examined by means of macroscopic (magnetization and linear thermal expansion) and microscopic (neutron powder diffraction) techniques. The high-temperature $O(\m…
Abstract Core–shell poly(butadiene‐ graft ‐styrene) (PB‐ g ‐PS) rubber particles were synthesized with different initiation systems by emulsion grafting polymerization. These initiation systems included the redox initiators and an oil‐soluble initiator, 1,2‐azobisisobutyronitrile (AIBN). Then the PB‐ g ‐PS impact modi…
Abstract A miscible blend of 85.5 wt % atactic polystyrene and 9.5 wt % poly(phenylene ether) containing 5.0 wt % expanded graphite nanoparticles was melt‐spun and stretched up to 25 times. The structure and electrical and mechanical properties of the fibers were investigated. Characterized by a Hermans orientation fa…
Abstract Porous poly(2‐hydroxyethyl methacrylate‐methyl methacrylate) particles crosslinked with ethylene glycol dimethacrylate were synthesized by free‐radical suspension copolymerization in an aqueous phase initiated by an oil‐soluble initiator, 2,2‐azobisisobutyronitrile. 1‐octanol was used as a pore forming agent…
The universality of the frequency-dependent (AC) conduction of many disordered solids in the extreme-disorder limit has been demonstrated experimentally. Theoretically, this universality has been established with different techniques and for various models. A popular model that has been extensively investigated and fo…
Volume 2 presents the fundamental principles related to polymer processign operations including the processing of thermoplastic polymers and thermosets. The objective of this volume is not to provide recipies that necessarily guarantee better product quality. Rather, emphasis is placed on presenting a fundamental appr…