Materials Literature
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Abstract This study describes the preparation of blends between an amorphous polymer (PVC) and a crystalline polymer (PEO), with a third polymeric part that presents electronic conduction capacity (PEDOT‐PSS). Binary (PEO/PVC, PEO/PEDOT‐PSS, PVC/PEDOT‐PSS) and ternary (PVC/PEO/PEDOT‐PSS) blends were prepared by changi…
The formation of stable freely suspended filaments is an interesting peculiarity of some liquid crystal phases. So far, little is known about their structure and stability. Similarly to free-standing smectic films, an internal molecular structure of the mesophase stabilizes these macroscopically well-ordered objects w…
The energy levels of lanthanide ions have been studied in great detail in the energy range up to $40\phantom{\rule{0.2em}{0ex}}000\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ $(250\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$. Recently an increased interest in the high energy levels between 40 000 and $70\ph…
Recombinant sorbitol dehydrogenase (SDH) from Rhodobacter sphaeroides has been crystallized in the absence of the cofactor NAD(H) and its structure determined to 2.4 A resolution using molecular replacement (refined R and R free factors of 18.8 and 23.8%, respectively). As expected from the sequence and shown by the c…
Treatment of CrCl(2)(THF)(2) with NaOSi(t)Bu(3) afforded the tetrameric "box" [Cr(mu-Cl)(mu-OSi(t)Bu(3))](4) (1, X-ray). THF cleaved 1 to provide trans-(silox)ClCr(THF)(2) (2), whereas degradation of 1 with 4-picoline caused disproportionation and the generation of trans-Cl(2)Cr(4-pic)(2) and trans-(silox)(2)Cr(4-pic)…
A series of fluorene and bipyridine (bpy) copolymers were synthesized, and their optical properties were investigated in the presence of zinc(II). By adjusting the bpy content in the polymer backbone, the emitting color of the polymer solution could be tuned from initial blue to green to white and violet when it inter…
Tetracyano-p-quinodimethane (TCNQ) molecules encapsulated single-walled carbon nanotubes (SWNTs) were investigated by using core level and valence band x-ray photoemission spectroscopy as well as near-edge x-ray-absorption fine structure spectroscopy. The $\ensuremath{\pi}$-band and ${\ensuremath{\pi}}^{*}$-band struc…
Melt state properties of nylon-11 and its exfoliated silicate nanocomposite were monitored during extrusion compounding using an on-line dielectric slit die sensor, and solid-state properties were probed off-line below the melting temperature by a dielectric spectrometer. A comprehensive relaxation master map for nylo…
Setting up vapor-diffusion crystallization experiments against four different reservoir solutions showed that the reservoir solution may have a profound effect on the outcome of a crystallization experiment. This suggests that a facile way to increase crystallization space through screening is not to add more crystall…
Complex [CpIr(dmpm)H(2)](2+) (dmpm = bis(dimethylphosphino)methane) has been reported to display temperature-dependent spin-spin coupling constant ((1)J(HD)) and isotope effect on the (1)H NMR chemical shift (Deltadelta). A combined electronic structure density functional theory + quantum nuclear dynamics study is use…
We report on the study and modeling of the structural and optical properties of rib-loaded waveguides working in the 600–900-nm spectral range. A Si nanocrystal (Si-nc) rich SiO2 layer with nominal Si excess ranging from 10% to 20% was produced by quadrupole ion implantation of Si into thermal SiO2 formed on a silicon…
Extended x-ray absorption fine structure (EXAFS) measurements have been used to characterize the ion-irradiation-induced crystalline-to-amorphous phase transformation in Ge nanocrystals. The atomic-scale structure of Ge nanocrystals in a silica matrix is first shown to deviate from that of bulk crystalline material wi…
Creep and relaxation of domain walls under ac electric fields are observed in an ideal model system, periodically poled ${\mathrm{KTiOPO}}_{4}$, to occur in different regimes, which are separated by dynamic phase transitions at frequencies ${f}_{m}(T)={f}_{m0}\mathrm{exp}(\ensuremath{-}\ensuremath{\Delta}E/{k}_{B}T)$…
The structure of turkey egg-white lysozyme (TEWL) has been refined from high-resolution X-ray powder diffraction data. The sample was rapidly obtained as a polycrystalline precipitate at high protein concentration using 0.5 M NaCl solvent pH 6 and was deposited in the PDB with code 1xft. The diffraction data were coll…
Abstract The thermal and mechanical properties of uncrosslinked three‐component blends of linear low‐density polyethylene (LLDPE), low‐density polyethylene (LDPE), and a hard, paraffinic Fischer–Tropsch wax were investigated. A decrease in the total crystallinity with an increase in both LDPE and wax contents was obse…
We study by kinetic Monte Carlo simulations the dynamic behavior of a Ziff-Gulari-Barshad model with CO desorption for the reaction CO + O-->CO(2) on a catalytic surface. Finite-size scaling analysis of the fluctuations and the fourth-order order-parameter cumulant show that below a critical CO desorption rate, the mo…
Sticking out. This work is aimed at obtaining new insights into the design of novel Gd chelates that form high-affinity adducts with HSA. Two new GdIII complexes that differ in the size of the hydrophobic moiety responsible for the interaction with the protein have been synthesised. It was shown that the two complexes…
Up to about 60% K + in K 2 Al 2 B 2 O 7 (KABO), a well-known nonlinear optical material, can be substituted by Na + with the structure type being retained. AlO 4 tetrahedra and BO 3 triangles in the Na-substituted compound tilt to adjust to the local distribution of alkali-metal atoms, which explains the large range o…
The surface rearrangement of polymer brushes composed of diblock copolymer chains with fluoropolymer blocks has been shown to be readily induced using thermal annealing. Changes in surface composition accomplished by the rearrangement were demonstrated by tensiometry and atomic force microscopy (AFM). Most of the rese…
Abstract Fluorinated polyacrylate latices with core–shell structure were prepared by semi‐continuous emulsion polymerization, using a mixed emulsifier system composed of a reactive emulsifier and a small amount of anionic emulsifier. The conversion and chemical components of the final latices were studied by gravimetr…