Materials Literature
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Pure and Mg doped ZnO thin films were deposited at 400 °C on glass substrates by pulsed laser deposition. An x-ray diffractometer (XRD) was used to investigate the structural properties of the thin films. It is found that all the thin films have a preferred (002) orientation. The peak position of (002) orientation is…
We report on fabrication of field-effect transistors (FETs) based on transition metal dichalcogenides. The unique structure of single crystals of these layered inorganic semiconductors enables fabrication of FETs with intrinsically low field-effect threshold and high charge carrier mobility, comparable to that in the…
We apply the recently developed plasmon hybridization method to nanoparticle dimers, providing a simple and intuitive description of how the energy and excitation cross sections of dimer plasmons depend on nanoparticle separation. We show that the dimer plasmons can be viewed as bonding and antibonding combinations, i…
Abstract Hydrophobic derivatives of D ‐glucaric acid, HOOC−(CHOH) 4 −CONHR,where R is an alkyl chain having 3, 8, 10, or 12 carbon atoms, have been synthesized from D ‐glucaro‐1,4‐lactone and the corresponding amines. The complexing abilities of these compounds toward trivalent lanthanide cations have been studied, us…
Abstract An algorithm is introduced for the molecular simulation of constant‐pressure plastic deformation in amorphous solids at zero temperature. This allows to directly study the volume changes associated with plastic deformation (dilatancy) in glassy solids. In particular, the dilatancy of polymer glasses is an imp…
A novel drug delivery system, bullfrog skin collagen film, was employed to release bovine serum albumin (BSA). The biophysical properties of bullfrog skin collagen film used were evaluated by thermal denaturation temperature and percentage water loss. The film obtained exhibited good stability and can be taken as a go…
Abstract Acrylamide was grafted to an xanthate mixture of carboxymethylcellulose with a sodium bisulfate/ammonium persulfate redox initiator system in water, sodium hydroxide, potassium hydroxide, and dioxane at 40, 50, 60, 70, and 80°C during a reaction period of 2 h. The grafted polymer and homopolymer were isolated…
Pyridoxine (vitamin B(6)) is not only an essential cofactor in amino acid biosynthesis but has recently been added to the list of potent antioxidants found in plants (Bilski et al., 71: 129-134, 2000). Herein the cloning of a gene (pvPDX1) from Phaseolus vulgaris that has a high degree of similarity to PDX1 from Cerco…
Abstract Summary: The polymorphisms in poly(hexamethylene terephthalate) (PHT), along with their associated melting and spherulite morphologies, were examined by differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction (WAXD), and polarized‐light microscopy (PLM). The morphology and crystal cells were dep…
The heat capacities were measured by adiabatic calorimetry down to 6 K on both the right-handed isomer and a racemic mixture of 4-(1-methylheptyloxy)-4‘-cyanobiphenyl. A thermodynamic relationship between two crystalline phases has been established and inversion between the stable and the metastable crystals has been…
The structural transformations of a MgO-attached [Ru 6 C] cluster catalyst during carbonylation under CO/H 2 and decarbonylation under vacuum were studied by energy-dispersive X-ray absorption fine structure (DXAFS). The DXAFS study revealed that the carbonylation of [Ru 6 C]/MgO to [Ru 6 C(CO) 11 ]/MgO proceeded via…
While direct laser desorption ionization of soluble polyaniline dried onto metal sample plates results in mass spectra that are similar to previously shown electrospray ionization data of similar samples, laser desorption of unsolubilized solid polyaniline results in major fragmentation of the phenyl rings. Solventles…
Contrary to the usually accepted phenomena, an optically heterogeneous 1:1 diastereomixture of DS and LS and a racemate of LS and DR obtained, respectively, from a racemic myo-inositol derivative and (S)- and racemic O-acetylmandelic acid formed stronger organogels, especially with aromatic fluids, than those formed f…
UV radiation induced graft copolymerization of methacrylic acid onto natural lignocellulose (jute) fiber was carried out both by "simultaneous irradiation and grafting" and by preirradiation methods using 1-hydroxycyclohexyl-phenyl ketone as a photoinitiator. In the "simultaneous irradiation and grafting" method, the…
Abstract Summary: In this work, we synthesized two MDI‐based polyurethanes, including a poly(ether)urethane (PEU) and a poly(carbonate)urethane (PCU), by using different soft segments, poly(tetramethylene oxide) and poly(hexyl, ethyl)carbonate diol ( $\overline M$ ∼ 2 000). We demonstrated that, in addition to the enh…
Abstract We have synthesized and characterized a variety of new amphiphilic hexakisadducts of C 60 involving mixed octahedral [5:1]‐ and [3:3]‐addition patterns. The [5:1]‐adducts 3 and 13 contain five pairs of didodecyl or diethyl malonates as non‐polar addends and, as their polar part, an extended bis(malonate) invo…
Synthetic K-rich birnessites (KBi) were prepared from the thermal decomposition of a fine-grained KMnO 4 powder heated in an air atmosphere at temperatures ranging from 200 to 1000 °C. The qualitative analysis of powder X-ray diffraction (XRD) patterns reveals a complex range of structural transformations from one met…
Using a variety of spectroscopic techniques, a number of molecular functionalities have been studied in relation to the adsorption process of proteins to air-water interfaces. While ellipsometry and drop tensiometry are used to derive information on adsorbed amount and exerted surface pressure, external reflection cir…
We investigate dynamic heterogeneities in liquid water by performing molecular dynamics simulations of the SPC/E model. We find clusters of mobile molecules. We study the temperature and time dependence of the cluster size and find that clusters grow as temperature decreases and have a maximum size at the time scale c…
Abstract This study is concerned with the temperature and molecular weight dependence of the strain‐hardening behavior of polycarbonate. It is shown that the strain‐hardening modulus reduces with increasing temperature and decreasing molecular weight. This result is interpreted in terms of temperature accelerated rela…