Materials Literature
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Electrospun nanofibers based on copolyimides were made, aiming at finding a promising method for improving the mechanical properties of electrospun polyimide nanofibers. The copolyimide had a backbone consisting of 3,3',4,4'-biphenyl-tetracarboxylic dianhydride (BPDA), biphenylamide (BPA) and 4,4'-oxydianiline (ODA) r…
The geometric and electronic structures of dichlorocarbene (CCl(2)) functionalized BN nanotubes (BNNTs) were studied using density functional theory within the generalized gradient approximation. We found that the CCl(2) addition favors slanted B-N bonds in zigzag tubes, and the CCl(2)-attached BNNTs prefer open rathe…
We analyze the full transport statistics of graphene with smooth disorder at low dopings. First, we consider the case of one-dimensional (1D) disorder for which the transmission probability distribution is given analytically in terms of the graphene-specific mean free path. All current cumulants are shown to scale wit…
Spiders spin a functionally diverse array of silk fibers, each composed of one or more unique proteins. Most of these proteins, in turn, are encoded by members of a single gene family thought to have arisen through duplication and divergence of an ancestral silk gene. Because of its remarkable mechanical properties, o…
Highly luminescent CdS-core ZnS-shell nanorods stabilized by mercaptopropionic acid in water were synthesized wet-chemically and characterized by measuring photoluminescence spectra and kinetic profiles as well as absorption spectra, diffraction patterns, and electron microscope images. Photoluminescence from CdS nano…
A series of new monomers of 2,5-bis[(4-tertbutyl-phenyl)-1,3,4-oxadiazole] styrene (M-Ct) and 2,5-bis[(4-alkoxy-phenyl)-1,3,4-oxadiazole]styrene (M−OC m, m is the number of the carbons in the alkoxy groups, m = 8, 10, 12, 14) were synthesized. Conventional radical polymerization of the monomers resulted in a series of…
Using a surface forces apparatus, we have investigated the adhesive and lubrication forces of mica surfaces separated by a molecularly thin, subnanometer film of a high-molecular-weight (2.3 MDa) anionic polysaccharide from the algae Porphyridium sp. adsorbed from aqueous solution. The adhesion and friction forces of…
Investigations on optical and dielectric properties of hybrid ultrathin layer-by-layer (LbL) films of gold nanoparticles (AuNPs) and polyelectrolytes under different pH conditions resulted in surface plasmon resonance (SPR) signal enhancement under attenuated total reflection (ATR) spectroscopy conditions. Theoretical…
The substituted glycolides rac -dicyclohexylglycolide ( rac -3,6-dicyclohexyl-1,4-dioxane-2,5-dione), meso -dicyclohexylglycolide, R, R -dicyclohexylglycolide, and rac -methylcyclohexylglycolide ( rac -3-cyclohexyl-6-methyl-1,4-dioxane-2,5-dione) have been synthesized, and both solution and bulk polymerizations of the…
We have used density functional theory calculations within the $\mathrm{LDA}+U$ formulation to investigate how small amounts of dissolved $\mathrm{Si}{\mathrm{O}}_{2}$, $\mathrm{Ge}{\mathrm{O}}_{2}$, $\mathrm{Sn}{\mathrm{O}}_{2}$, or $\mathrm{Pb}{\mathrm{O}}_{2}$ affect the redox thermodynamics of ceria $(\mathrm{Ce}{…
Sufficient blood perfusion is essential for all tissues to guarantee nutrient- and gas exchange. As many diseases are induced by the reduction of blood perfusion such that these tissues gradually loose their ability to function properly, therapeutic angiogenesis aims to increase blood flow in ischemic tissues by stimu…
The synthesis and self-assembly behavior of a set of peptide−polymer conjugates is described. It is demonstrated that an oligopeptide segment, composing 3.5 wt % of a conjugate, can effectively direct the microstructure formation of a poly( n- butyl acrylate)-block (p n BA) with M n ≈ 38 000. RAFT polymerization is us…
Phase formation of NiTi alloys via solid-state diffusion reactions is investigated. Samples of different Ni-Ti compositions were synthesized from elemental powders. The study revealed that the sintered samples consisted of Ti(Ni), NiTi2, NiTi and Ni3Ti in co-existence. Such co-existence is not expected from the equili…
The higher lying bright exciton energies $({E}_{11}^{M},{E}_{33}^{S},{E}_{44}^{S},{E}_{22}^{M},{E}_{55}^{S},{E}_{66}^{S},{E}_{33}^{M})$ of single-wall carbon nanotubes are calculated by solving the Bethe-Salpeter equation within an extended tight binding method. For smaller diameter nanotubes, some higher ${E}_{ii}$ e…
Three new homodinuclear lanthanide(III) complexes of xanthene-9-carboxylic acid, [Ln2(XA)6(DMSO)2(H2O)2](Ln = Eu (1), Tb (2) and Gd (3); HXA = xanthene-9-carboxylic acid; DMSO = dimethylsulfoxide), have been synthesized, of which 1 and 2 were structurally characterized by single-crystal X-ray diffraction. These compou…
We examine the effects of small-scale, hexagonal, lateral confinement on microdomain ordering in diblock copolymer thin films using self-consistent field theory simulations. Specifically, we examine a hexagonal confinement well with side length L approximately equal to five cylindrical microdomain lattice spacings. Th…
Phase transitions in micro-, submicro-, and nanocrystalline NaNbO 3 were investigated by temperature-tuning Raman spectroscopy and X-ray powder diffraction method. Three powders with different average particle size showed successive phase transitions within the measured temperature range from −150 to 450 °C. The tempe…
Short chain branched (SCB) polyolefins as a model of metallocene ethylene/α-olefin copolymers were simulated by Monte Carlo (MC) and molecular dynamics (MD) methods. Melt density, which was evaluated by MD in the isothermal−isobaric ensemble (NPT−MD), slightly increases with the SCB content. A mix of different MC move…
Polymer assisted deposition (PAD) is a chemical solution route to high quality thin films of metal oxides. This technique employs metal ions coordinated to polymers as the film precursor. The use of polymer bound metals has several advantages. The polymer controls the viscosity and binds metal ions, resulting in a hom…
N-glycan profiling of the human serum glycoproteins including immunoglobulin fraction on different age groups of healthy persons shows substantial changes with increasing age in three major N-glycan structures. In individuals more than 40-50 years of age, there is an increase in under-galactosylated glycans and a decr…