Materials Literature
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NmrA, a transcription repressor involved in the regulation of nitrogen metabolism in Aspergillus nidulans,is a member of the short-chain dehydrogenase reductase superfamily. Isothermal titration calorimetry and differential scanning calorimetry have been used to show NmrA binds NAD+ and NADP+ with similar affinity (av…
The effect of mechanical stimulation on the development of tissue-engineered blood vessels was examined. In particular, three different rates of radial distension were chosen to produce a nonpulsed environment (0 beats per minute [bpm]), an adult heart rate (90 bpm), and a fetal heart rate (165 bpm). Engineered vessel…
Hemp (Cannabis Sativ L.) is an important lignocellulosic raw material for the manufacture of cost-effective environmentally friendly composite materials. From an earlier study it was found that when hemp bast fibers were heated above the glass transition temperature of lignin, there was a migration of lignin to the su…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXT"Plug and Play" Polymers. Thermal and X-ray Characterizations of Noncovalently Grafted Polyhedral Oligomeric Silsesquioxane (POSS)−Polystyrene NanocompositesJoseph B. Carroll, Alan J. Waddon, Hiroshi Nakade, and Vincent M. RotelloVi…
A phase-field model was developed for predicting the domain structure evolution in a thin film with an arbitrary distribution of dislocations and subject to a substrate constraint. The effect of interfacial dislocations on the formation of tetragonal ferroelectric domains in a cubic paraelectric matrix was studied. It…
Microstructural characterization of boron‐containing SiC‐reinforced SiC composites exposed at high temperature in high‐water‐vapor‐pressure environments was used to determine surface recession rates and to understand the controlling degradation processes under these conditions. Results showed that composite degradatio…
Three Si 3 N 4 materials were exposed to dry oxygen flowing at 0.44 cm/s at temperatures between 1200° and 1400°C. Weight change was measured using a continuously recording microbalance. Parabolic kinetics were observed. When the same materials were exposed to a 50% H 2 O–50% O 2 gas mixture flowing at 4.4 cm/s, all t…
Peak profile analysis based on high-resolution X-ray diffractometry and transmission electron microscopy (TEM) were used to measure the distribution of grain sizes, the dislocation density, and the corresponding root mean square strain in ultrafine-grained (UFG) nickel processed by different methods: electrodeposition…
We have fabricated electrodes for a supercapacitor using fluorinated single-walled carbon nanotubes (SWCNTs). Although the specific surface areas of the pristine and fluorinated SWCNTs are similar, the electrochemical reactions are different significantly from each other. The specific capacitance of the fluorinated SW…
Poly( l -lysine) (PLL) was end-grafted onto silicon oxide surfaces to study its conformational transition among α-helix, β-sheet, and random coil at the solid−water interface. Surface-grafted PLL films were prepared from surface-grafted poly( N ε -carbobenzyloxy- l -lysine) (PCBL) thin films, which were fabricated by…
We present calculations for possible configurations of nitrogen-containing single-walled carbon nanotubes and their electronic properties obtained with the ab initio tight-binding FIREBALL method. It is found that nitrogen atoms can be energetically incorporated into the carbon network in three forms: Substitution, su…
The objective of this paper is to review the mechanism of military transformations. Evidence is presented showing that these diffusionless transformations, which involve shear dominant deformation concomitant with interface motion in stiff engineering materials, occur by motion of disconnections along the interfaces.…
A highly effective one-step approach was developed to synthesize single-crystalline MgO nanotubes and in situ fill nanotubes with Ga. The axes of nanotubes are in the [100] direction of cubic MgO. The prepared nanotube exhibits a square-like cross section both for its interior and exterior. The liquid metal-assisted r…
The oxidation of SiC at 1200°C in a slowly flowing gas mixture of either air or air + 15 vol% H 2 O at 10 atm (1 MPa) was studied for extended times to examine the effects of elevated water‐vapor pressure on oxidation rates and microstructural development. At a water‐vapor pressure of 1.5 atm (150 kPa), distinct SiO 2…
Preparation of dendrimer-encapsulated metal nanoparticles (DEMNs) within amphiphilic dendrimers in an organic solvent is reported. The important new result is that metal ion encapsulation is driven by solubility differences between the metal salt in solution and the dendrimer interior. This contrasts with previous stu…
Hyperbranched polymers are by now an established class of polymeric materials and can be considered as highly functional specialty products. It is verified that they offer the chance for the development of new products but at the same time they present a challenge due to their complex branched structure. Examples out…
Lead-free potassium–bismuth titanate, K0.5Bi0.5TiO3 (KBT), ferroelectric ceramics were fabricated from the natural sintering of powders prepared by the thermal decomposition of adequate precursor solutions. Their crystal structure was determined by x-ray diffraction, and the temperature dependence of dielectric consta…
Force−distance studies suggest that electrostatic forces play a dominant role in the resistance of oligo(ethylene glycol) (OEG) terminated self-assembled monolayers (SAMs) to adsorption from aqueous solution, whereas for end grafted poly(ethylene glycol) (PEG) coated surfaces inertness is explained by a steric repulsi…
Summary An extensive study of adsorption and desorption isotherms of four phosphonates on barite or calcite are tested for a wide range of solution conditions (0 to 1 M NaCl, 0 to 0.1 M Ca, 0 to 0.33 M sulfate, and 4.6 to 6.4 pH). From these adsorption/desorption observations, it is proposed that the primary driving f…
Combinations of differential scanning calorimetry, Fourier transform infrared spectroscopy, optical microscopy, and small-angle X-ray scattering were used to investigate the influence of hydrogen bonding strength on the crystallization kinetics and morphologies in poly(ε-caprolactone) (PCL) blends with three different…