Materials Literature
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A novel and general approach to scaling diffraction intensities is presented. The method minimizes the disagreement among multiple measurements of symmetry-related reflections using a stable refinement procedure. The scale factors are described by a flexible exponential function that allows different scaling correctio…
Abstract No abstracts.
We report here three examples of the reactivity of protic nucleophiles with diimine-type ligands in the presence of Fe(II) salts. In the first case, the iron-promoted alcoholysis reaction of one nitrile group of the ligand 2,3-dicyano-5,6-bis(2-pyridyl)-pyrazine (L1) permitted the isolation of an stable E-imido-ester,…
The compound Ag1.49Mn1.49IIMn1.51III(AsO4)3 (silver manganese arsenate) was prepared by a solid-state reaction. It crystallizes in the monoclinic system in space group C2/c. The three-dimensional network is built up from MnO6 octahedra, sharing edges which are linked together by the arsenate groups (AsO4). This arran…
We have observed the azimuthal switching at the interface of nematic liquid crystals (LCs) and the aligning substrate, induced by the planar electric field of a fine comb electrode. Optical transmittance as a function of applied voltage was modeled by both the elastic theory with rigid anchoring and the Landau-de Genn…
Abstract The high atom efficiency was achieved through addition of Ac 2 O in the Sc(OTf) 3 ‐catalyzed allylation of aldehyde with tetraallytin in a 4 : 1 molar ratio.
Abstract The kinetics of melt intercalation of poly(propylene)/montmorillonite nanocomposites was studied by a rheological approach. The experimental sample was elaborately prepared to investigate the whole intercalating process. The intercalation process was demonstrated by the changes of the viscoelastic response wi…
Robust noncentrosymmetric polymer networks with a net polarization and bulk pyroelectric properties are achieved by aligning a polymerizable bent-core mesogen in the liquid-crystalline state and cross-linking under a static electric field (see schematic representation).
In this paper, we report the fabrication and characterization of polyaniline colloid (PANIC) multilayer thin films prepared from PANIC aqueous dispersion and a polyelectrolyte solution. Both chiral and achiral PANICs were used to fabricate multilayer thin films of up to 30 bilayers. Transmission electron microscopy, a…
Abstract Silk fibers and membranes were acylated with octadecenylsuccinic anhydride (ODSA) at 75°C for different times. Swelling [ N,N ‐dimethylformamide (DMF) and dimethyl sulfoxide (DMSO)] and nonswelling (xylene) solvent media were used for the reaction. Silk membranes that reacted in DMF or DMSO displayed faster r…
Abstract The aim of this study was to compare different models, either originating from literature or originally proposed in this study, for the interpretation of the melting behavior of polymers. In particular, these models, tested with a linear low‐density polyethylene widely used in rotational molding, are suitable…
Abstract β‐Methyl‐α‐methylene‐γ‐butyrolactone (MMBL) was synthesized and then was polymerized in an N,N ‐dimethylformamide (DMF) solution with 2,2‐azobisisobutyronitrile (AIBN) initiation. The homopolymer of MMBL was soluble in DMF and acetonitrile. MMBL was homopolymerized without competing depolymerization from 50 t…
Raman spectroscopy has been used to investigate picosecond vibrational dynamics of the molecular glass-former phenyl salicylate (salol). The study has concentrated on the elucidation and comparison of molecular dynamics of salol subjected to different local environments, namely in bulk, in a dilute CCl4 solution, and…
A remarkable and unprecedented increase in catalyst selectivity in dendrimer catalysis is observed for the Pyrphos-Pd catalysed allylic amination of 1,3-diphenyl-1-acetoxypropene as a function of the dendrimer generation (with up to 64 metal sites). This steady increase in ee-values for the allylic amination is less p…
Abstract Two kinds of regenerated cellulose membranes for hemodialysis were prepared from casting solutions of N ‐methylmorpholine‐ N ‐oxide (NMMO) and cuprammonium (denoted NMMO membranes and cuprammonium membranes, respectively). The concentration of cellulose in the casting solution investigated was 6–8 wt %. The p…
Abstract Controlled thermolysis of gold(I) complex, [Au(C13H27COO)(PPh3)], at 180 °C for 5 h under an N2 atmosphere affords the new type of monodispersed spherical gold nanoparticles capped by myristate and a small amount of PPh3 ligands (average diameter 23 ± 1.5 nm), in spite of no use of solvent, reducing agent and…
IR irradiation of a boron thin film coated on a Si(001) wafer in the presence of Mg vapor in an Ar/O2 atmosphere results in the formation of magnesium borate nanotubes (see picture). The structural characterizations demonstrated that the nanotubes are single crystalline orthorhombic Mg3B2O6 (3 MgO⋅B2O3). The formation…
N-acetylneuraminate lyase (NAL) and dihydrodipicolinate synthase (DHDPS) belong to the NAL subfamily of (betaalpha)(8)-barrels. They share a common catalytic step but catalyze reactions in different biological pathways. By rational design, we have introduced various mutations into the NAL scaffold from Escherichia col…
The surface of a polypropylene (PP) film was modified using acetone and acetone/oxygen. Significant improvement in surface energy was observed due to plasma treatment. The chemical nature and stability of the surface modification was studied by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectros…
Abstract Rheological properties of nylon‐1212 have been studied by means of Haake Rheometer. The effect of shear rate and temperature on the apparent vicosity of nylon‐1212 was discussed. A correlation of non‐Newtonian index with the temperature was obtained. The results showed that the apparent viscosity decreases wi…