Materials Literature
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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…
Abstract Polyethylene (PE)/montmorillonite (MMT) nanocomposites were prepared by in situ coordination polymerization using a MMT/MgCl 2 /TiCl 4 catalyst activated by Al(Et) 3 . The catalyst was prepared by first diffusing MgCl 2 into the swollen MMT layers, followed by loading TiCl 4 on the inner/outer layer surfaces…
Ru(III) and Ni(II) ammine complexes were grafted onto the pore surface of MCM-41 by ion exchange from basic aqueous solution. Covalent anchoring of the type M−O−Si (M = Ru or Ni) is obtained by this method. The structure of the grafted complexes was studied by UV−vis, FT-IR, and X-ray absorption spectroscopy. [Ru(NH 3…
The phase diagram of the dense ices VII, VIII (molecular phases), and X (nonmolecular phase) was investigated over a $P\ensuremath{-}T$ region of 12-298 K and 2-100 GPa by infrared absorption measurements. The ice VII-VIII and VIII-X phase boundaries determined in this study agree with those provided by previous Raman…
CeO 2 -based binary oxides catalyzed the cyclization of 1,6-hexanediol into cyclopentanone at temperatures of 400–475 °C. CeO 2 -based solid solution with Mn content of 20 mol% shows the highest catalytic activity, both conversion and selectivity, while both pure CeO 2 and Mn 2 O 3 have the cyclization ability of 1,6-…
Stacking faults are found to play a crucial role in the evolution of the structural and magnetic properties of cobalt subjected to ball milling. This has been evidenced by using complementary techniques, i.e., magnetometry and torque measurements, nuclear magnetic resonance (NMR) and x-ray diffraction (XRD). After sho…
Presented are density functional calculations on various Mn(salen) systems that are active catalysts in the epoxidation of olefins. Correlation of various structural properties such as Mn=O bond strengths, atomic charges, and C-O distances of evolving bonds in transition state geometries with modified Hammett constant…
Abstract Four dry corn starches with different amylose content were blended at 185°C with poly(lactic acid) (PLA) at various starch:PLA ratios using a lab‐scale twin‐screw extruder. Starch with 30% moisture content also was blended with PLA at a 1:1 ratio. Each extrudate was ground and dried. The powder was mixed with…
We investigate the equilibrium geometries and the systematics of bonding in various isomers of a 24-atom boron cluster using Born-Oppenheimer molecular dynamics within the framework of density functional theory. The isomers studied are the rings, convex and quasiplanar structures, the tubes, and closed structures. A s…
Small gold (5 nm) and zirconia (2−3 nm) particles inside the mesopores of SBA-15 were visualized with bright-field electron tomography. Due to the ordered nature of the mesopores and the related diffraction contrast present in the tilt series, the 3D-reconstruction is difficult to interpret. Unequivocal information ha…
It is difficult for outdoor apparel manufacturers to interpret the technical information provided by fabric suppliers concerning fabric ‘breathability’ properties because different methods and test conditions are used. In addition, fabrics with hydrophilic components change their properties under different humidity co…