Materials Literature
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Fabrication conditions of microporous thermoplastic polyurethane to be used in small-diameter vascular grafts are studied. Porosity variations due to various factors such as concentration of PU solution, composition of coagulation bath, effect of coagulant temperature, and effect of dissolved air in PU solution are di…
ZnO nanostructures with different morphologies have been achieved by simple thermal evaporation of mixed powders of ZnS, graphite and SnO 2 at 1050 °C in a flowing Ar atmosphere. Branched nanobelts and wide nanosheets of ZnO were formed on Si wafers at a temperature of 700 and 500 °C, respectively. As for the branched…
The efficiency of the photochemical ring-opening of chromenes (or benzopyrans) depends on the vibronic transition selected by the chosen excitation wavelength. In the present work, ab initio CASPT2//CASSCF calculations are used to determine the excited-state ring-opening reaction coordinate for 2H-chromene (C) and 2,2…
Abstract Red phosphorus was combined with metallic oxides Fe 2 O 3 and MgO to improve the fire properties of recycled PET. Both Fe 2 O 3 and MgO act as co‐synergist agents at a total loading of 5 wt%. The analysis by diffraction X of the char formed during combustion shows that transformation of Fe 2 O 3 to Fe 3 O 4 o…
Abstract For Abstract see ChemInform Abstract in Full Text.
3-, 4-, and 2-ferrocenylazobenzenes, 1, 2, and 3, respectively, and several derivatives of 1 were synthesized, and their photoisomerization behaviors were examined. The molecular structures of 1 and its derivatives, 2-chloro-5-ferrocenylazobenzene (5) and 3-ferrocenyl-4'-hydroxylazobenzene (11), were determined by X-r…
We present the first observations of dc electric-field-induced rotational motion of finite particles in liquid crystals. We show that the electrorotation is essentially identical to the well-known Quincke rotation, which in liquid crystals triggers an additional translational motion at higher fields. In the smectic ph…
Zinc oxide films with ordered lamellar structures can be electrochemically produced by interfacial surfactant templating. This method utilizes amphiphile assemblies at the solid-liquid interface (i.e., the surface of a working electrode) as a template to electrodeposit inorganic nanostructures. To gain the ability to…
Equiatomic and near-equiatomic nickel-titanium alloys exhibit a shape-memory effect and superelasticity. However, the properties of such alloys are extremely sensitive to the precise nickel-titanium ratio and the addition of alloying elements. High corrosion resistance is necessary for biomedical applications, especia…
1H NMR, (13)C NMR, and EPR spectra of six-coordinate ferric porphyrin complexes [Fe(Por)L2]ClO4 with different porphyrin structures are presented, where porphyrins (Por) are planar 5,10,15,20-tetraphenylporphyrin (TPP), ruffled 5,10,15,20-tetraisopropylporphyrin (TiPrP), and saddled 2,3,7,8,12,13,17,18-octaethyl-5,10,…
Using a one-dimensional system, we demonstrate a wide variety of wave propagation phenomena possible in nonlinear left-handed media. These include effective second-harmonic generation where the fundamental wave and the second-harmonic wave are badly mismatched. We also observe parametric instabilities accompanying int…
We report on the growth of nominally undoped p-type ZnO films on Si(111) substrates by pulsed-laser deposition. Hall effect measurements show that the undoped ZnO films change from n-type to p-type material when the oxygen pressure changes from 6×10−5to3×10−4Torr during growth. Ti∕Au contacts produce ohmic behavior to…
Fine control of gold nanoparticle shape can be achieved by varying the pH of the reaction medium in the presence of gold nanorods, which acted as seeds. Under various pH (3.6–9.6) values of the reaction medium, different shapes of gold nanostructural architectures, from rectangle-, ‘dogbone’- and peanut-like outlines…
Three-dimensional quantitative structure−activity relationship (3D-QSAR) methods have been successfully applied in the field of drug design to search for a correlation between detailed molecular structure and bioactivity. Other areas, such as the development of single-site catalysts for homogeneous olefin polymerizati…
Keeping nature under control: The internal structure of helical porous protein mimics self-assembled from hybrid dendritic dipeptides is programmed by the stereochemistry of the dipeptide and regulated allosterically. This is the first example of a synthetic helical porous supramolecular structure that is stable both…
The interaction between self-aggregated porphyrins such as 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) and 5,10,15,20-tetrakis(4-phosphonatophenyl)porphyrin (TPPP), and a generation 5 (G5) PAMAM dendrimer template is governed by minute differences of porphyrin acido-basic properties. While at neutral pH bot…
Chiral aggregation of oligo(p-phenylene vinylene)-functionalized Zn and free-base porphyrins is observed in water. The formation of mixed assemblies containing both porphyrins results in sequential energy transfer from OPV via zinc porphyrin to free-base porphyrin. Furthermore, the incorporation of C60 as electron acc…
Gates leading from cages: Linked paramagnetic cage complexes could potentially be used as quantum gates for quantum information processing. Experiments demonstrate that it is possible to link octanuclear {Cr7Ni} rings through both organic and metal–organic fragments into supramolecular dimers (see structure; Cr green,…
The crystallization kinetics of poly(l-lactide), PLLA, is slow enough to allow a quasi-amorphous polymer to be obtained at low temperature simply by quenching from the melt. The PLLA crystallization process was followed by differential scanning calorimetry and optical microscopy after nucleation isothermal treatments…
Oriented SWNTs in polymer composites have shown dramatic improvements in the physical properties of a composite because of the anisotropic shape and properties of SWNTs. Controlled alignment of SWNTs during composite fabrication implies better material function performance. This letter reports a new fabrication techni…