Materials Literature
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The generation of spherical colloids of titania with uniform diameters (see Figure for an SEM image) has been achieved using a new precursor. By varying the concentration of titanium glycolate in acetone the diameter of these spherical colloids could be controlled in the 200–500 nm range. The as‐synthesized colloids c…
Abstract Ordered molecular materials are increasingly used in active electronic and photonic organic devices. In this progress report we discuss whether the self‐assembling properties and supramolecular structures of liquid crystals can be tailored to improve such devices. Recent developments in charge‐transporting an…
The creation of continuous nanoscale composite fibrils from carbon nanotubes using an electrospinning process is reported. Nanotube bundles align in the fiber, and upon heat treatment, the composite fibrils are carbonized at 1100 °C to form the SWNT/carbon yarns. The fibrils show superior mechanical properties and can…
In this paper, we report the complete synthesis and characterization procedures to generate highly organized and oriented mesoporous titania thin films, using poly(ethylene oxide) (PEO)-based templates. Controlled conditions in the deposition, postsynthesis, and thermal treatment steps allow one to tailor the final me…
Abstract A ternary blend of the PA6 matrix with a finely dispersed rigid polymer and elastomer is a system with well‐balanced mechanical properties. Its micromechanical behavior, especially that of the elastomer phase, apparently differs from corresponding binary mixtures. This study shows the influence of the elastom…
Single crystals of monoclinic BaY2F/sub 8/, doped with different Nd/sup 3+/ concentrations, were successfully grown by means of the Czochralski method. Here, we present a polarized infrared (IR) spectroscopic investigation and diode-pumped continuous-wave laser results in the 1 μm wavelength region. Moreover for the f…
Abstract H1 technology needlepunching machinery is one of the recent developments in the needleloom technology. H1 technology needlepunching nonwoven machinery has been effectively utilized to develop a set of nonwoven substrates at different punching rates. The effect of needlepunching speeds on the frictional proper…
Electrical properties of Au and Ag Schottky diodes prepared on epiready (0001)Zn surfaces of bulk n-ZnO crystals with electron concentration close to 1017 cm−3 were studied after various surface cleaning treatments. The lowest reverse currents were obtained with simple cleaning of the surface in organic solvents while…
Based on a transient thermal model of a point heat pulse, a dual-thermistor probe, in which two thermistor beads serve as point heater and temperature sensor respectively, has been developed for absolute measurement of thermal diffusivity and conductivity. An experimental system with high sensitivity for temperature c…
Calorimetric studies have been performed on the Se Te20 Pbx () samples at different heating rates (5−20 °C/min). The glass transition temperature Tg, the peak crystallization temperature Tp, and the melting temperature Tm are found to increase with increase in heating rate. The apparent activation energies for glass t…
The partitioning of pyrrole into Nafion membranes in their Na +, Me 4 N +, and Et 4 N + forms has been investigated by electronic absorption spectroscopy and the results are compared with those previously obtained with membranes in the acid form (H-Nafion). In the absence of the acid-catalyzed reactions observed for H…
A water-soluble, blocked diisocyante was used to cross-link chitosan under various degrees of solvation, including hydration to form hydrogels. Thermal cross-linking of films cast from various amounts of organic cosolvents was found to increase with increased level of cosolvent up to a solvation level of 17% (w/w) and…
A psychrophilic bacterium, Cytophaga sp. strain KUC-1, that abundantly produces a NAD(+)-dependent L-threonine dehydrogenase was isolated from Antarctic seawater, and the enzyme was purified. The molecular weight of the enzyme was estimated to be 139,000, and that of the subunit was determined to be 35,000. The enzyme…
Factors that influence aggregation of lanthanide(III) (Ln(III)) ions to form polynuclear complexes were studied utilizing 1-aziridineethanol as a versatile source of macrocyclic and acyclic chelates. The facile ring-opening cyclo-oligomerization of 1-aziridineethanol leads to the formation of a series of polyaza cycli…
Abstract This study investigated the activity of trypsin that had been covalently immobilized onto acrylic acid (AA)– and methacrylic acid (MAA)–grafted polyethylene (PE) plates—PE– g –PAA and PE– g –PMAA—using a water‐soluble carbodiimide as a coupling agent, as a function of the immobilized amount, the grafted amoun…
A novel template synthesis of bone-shaped (dumbbell-shaped, dogbone-shaped) nanomaterials is demonstrated. Porous anodic alumina (PAA) templates with uniform nanochannels were fabricated using a four-step anodization process and used to form bone-shaped carbon nanostructures with stem and end diameters and lengths of…
Schritt für Schritt: Mit zunehmender Konzentration des Bis(merocyanin)farbstoffs 1 findet ein stufenweiser Selbstorganisationsprozess statt, bei dem supramolekulare Polymere, Organogele und flüssigkristalline Mesophasen gebildet werden. Als Folge der dichten Packung der Chromophore in diesen supramolekularen Strukture…
A feature of the skin of many vertebrates is the presence of open grooves with characteristic intersecting geometric patterns. Here, we measure flows within the fine channels on the human skin surface and demonstrate that this network can act as a microfluidic device to allow the surface transport of liquids. Adapting…
[structure-see text]A series of fluorene-dithia[3.3]paracyclophane copolymers was synthesized by Suzuki coupling reactions of suitable precursors. Transannular pi-pi interactions altered the electronic and optical properties of the polymer backbone significantly. A large red shift in the emission spectrum of the unsub…
Neutral double-stranded helicates and molecular triangles and squares are formed through the self-assembly of spacer-bridged bis(pyrrol-2-ylmethyleneamine) ligands and ZnII ions (see scheme). The steric requirements of the Zn centers and the size and relative flexibility of the ligands dictate the degree of associatio…