Materials Literature
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Conventional bottom-up approaches for building nanostructures rely on the ability to synthesize nanoparticles of different shapes and sizes in a controlled manner that are then assembled to produce useful structures. Here, we present an alternate approach for producing nanostructures based on the formation of a crysta…
Cornerstone Research Group, Inc. (CRG) has demonstrated the feasibility of filament winding complex-curved composite shapes on shape memory polymer (SMP) mandrels. SMPs can exhibit a radical change from a rigid polymer to a flexible, elastic state, and then back to a rigid state under thermal stimuli. SMP mandrels for…
The temperature dependence of the band gap of semiconducting carbon nanotubes was measured for ten different nanotube species. The unprecedented effectiveness in avoiding the effect of external strain, or any other effects originating from the surrounding environment, lead to an accurate measurement of the band gap te…
We have developed a direct organocatalytic synthesis of a dendrimer-like star polyester. The synthesis was based on lactic acid-catalyzed bulk ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) with the hexahydroxy-functional dendrimer 2,2-bis(hydroxymethyl)propanoic acid as the initiator. The polymerization w…
Photoinduced electron transfer in intramolecularly interacting free-base porphyrin bearing one or four 18-crown-6 ether units at different positions of the porphyrin macrocycle periphery and pristine fullerene was investigated in polar benzonitrile and nonpolar o-dichlorobenzene and toluene solvents. Owing to the pres…
A new approach to the design and control of shape memory alloy (SMA) actuators is presented. SMA wires are divided into many segments and their thermal states are controlled individually as a group of finite state machines. Instead of driving a current to the entire SMA wire and controlling the wire length based on th…
The triplet metal-to-ligand charge transfer ((3)MLCT) dynamics of two structurally characterized Re(I)(CO)(3)(phen)(HisX)-modified (phen = 1,10-phenanthroline; X = 83, 109) Pseudomonas aeruginosa azurins have been investigated by picosecond time-resolved infrared (TRIR) spectroscopy in aqueous (D(2)O) solution. The (3…
Columnar phases made of polycatenar molecules with bent-shaped mesogenic cores are studied. The polar order in this system is associated with the change of the column building blocks from flat disks (Colh phase) into cones (Colh PA phase), which allows for axial polarization of the columns. The nature of the Colh and…
The effects of two kinds of representative catalysts, Ni/Al 2 O 3 and HZSM-5 zeolite, were investigated in the CO 2 reforming of CH 4 via corona plasma reactions at atmospheric pressure. The catalysts showed little effect on the conversions of CH 4 and CO 2, and we propose that rapid free-radical processes play a main…
A single-wall carbon nanohorn (SWNH) colloid was made to be magnetically responsive by anchoring magnetite nanoparticles prepared by the homogeneous mixing of FeCl(2)-FeCl(3) and NaOH solutions. Transmission electron microscopy observation showed the high dispersion of magnetite particles of 2-9 nm on the surface of t…
Autologous skin grafts are considered necessary for the treatment of extensive skin defects. However, skin graft by suturing is a time-consuming medical handling and rather stressful event for recipients. To that end, tissue adhesives have been suggested in skin grafts. Chitosan hydrogel is well known as a wound dress…
We study kinetic pathways of phase transitions in thin films of block copolymers subjected to an applied electric field by means of dynamic self-consistent-field calculations. We consider structures ranging from spheres to lamellae. We find that the kinetic pathway taken by a system near a phase transition is very dif…
The understanding of the formation mechanism of nanoparticles is essential for the successful particle design and scaling-up process. This paper reports findings of an X-ray absorption spectroscopy (XAS) investigation, comprised of X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structu…
In this work surface-enhanced resonance Raman spectroscopic experiments have demonstrated that metallic single-walled carbon nanotubes can be used as chemical assemblies between the pyrene analyte and the silver colloidal surface. Pyrene has been detected at concentrations lower than 10(-9) M by use of the 514.5 nm ex…
The present example illustrates the application of a consistent process development strategy to ascertain reproducible active pharmaceutical ingredient (API) polymorph manufacture. Key methodologies are illustrated using a Novartis API and carbamazepine as model substances. In the present example, the Novartis API was…
Titania thin films with hierarchical pore structure (macropores and nested mesopores) were obtained in one step by a combination of sol−gel synthesis with controlled phase separation. Poly(ethylene glycol) ( M w = 2000) induces a phase separation upon film formation, producing macropores with controllable diameters be…
A simple way to synthesize PbS nanocrystals with the ability to tune their morphology at room temperature is reported. The preparation utilizes an amine-catalyzed decomposition of a precursor and the amine was found to play dual roles as both the catalyst and the capping agent. Spherical PbS nanocrystals of diameters…
Congenital disorder of glycosylation type 1a (CDG-1a) is a congenital disease characterized by severe defects in nervous system development. It is caused by mutations in alpha-phosphomannomutase (of which there are two isozymes, alpha-PMM1 and alpha-PPM2). Here we report the x-ray crystal structures of human alpha-PMM…
The presence of dissolved gelatin in the sol state during the crystallization of ZnO has a substantial influence on its morphology. The gelatin behaves as a matrix where the ZnO is heterogeneously nucleated. The experimental conditions used during crystallization are very mild consisting of a diluted aqueous buffered…
This paper presents a comprehensive review of the state of the art and challenges involved in investment casting of Ti–6Al–4V (Ti–6–4) alloy to improve the quality, costs and manufacturing of Ti parts. More than one hundred selected reports and articles on melting, casting and secondary processes such as hot isostatic…