Materials Literature
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Therapeutic benefit in glial tumors is often limited due to low permeability of delivery systems across the blood-brain barrier (BBB), drug resistance, and poor penetration into the tumor tissue. In an attempt to overcome these hurdles, polyether-copolyester (PEPE) dendrimers were evaluated as drug carriers for the tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComposites of Intrinsically Conducting Polymers as Sensing NanomaterialsDavid W. Hatchett and Mira JosowiczView Author Information Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003 and Department of Chemistry and Biochemistry, Georgia Institute of T…
Oriented samples were crystallized with constant length and melted in a DSC-calorimeter. Analysing the crystallization-isotherms by means of the Avramitheory yields a one-dimensional growth of the crystallites from preexisting nuclei. This geometry of growth is independent of the degree of orientation for all samples…
Abstract BACKGROUND: The aim of the present work was to improve the properties of acrylic polymer, which is a major fibre‐forming polymer. Acrylonitrile/acrylic acid copolymer, P(AN/AA), was chosen for this purpose and it was intended to study the condition for the formation of hydroxyl groups through the formation of…
Ultrafast transient responses in single gold nanorods are visualized in real space by femtosecond pump-probe measurements using a near-field optical microscope. The observed transient images show characteristic features, and the features are strongly dependent on the size of the rod. It is revealed that the features a…
New nanocarriers are obtained by assembling two amphiphilic monomers: one containing the bioactive peptide CCK8 spaced, by a polydisperse poly(ethylene glycol), from two hydrophobic tails ((C18)2PEG2000CCK8), and the other containing a chelating agent able to give stable radiolabeled indium-111 complexes linked to the…
In semicrystalline isotactic Polypropylene the sensitivity to crack propagation can be lowered by the right choice of the molecular composition (atactic content, molecualr weight) and by a controlled production of a certain morphology. Coarse spherulitic morphologies produced by slow undercooling from the melt exhibit…
In bulk isotactic polypropylene it is relatively easy to change the morphology of the material in a wide range, mainly by different isothermal crystallization conditions. Size, distribution and inner structure of the spherulites have a great influence on the crack propagation in this material. Due to our microscopic i…
Abstract Artelon® (degradable poly(urethane urea) elastomer) was electrospun into scaffolds for tissue engineering. The diameter of the electrospun fibers, studied by scanning electron microscopy, ranged from 100 nm to a few μm, with an average diameter of 750 nm. The molar mass of the polymer had a major influence on…
The two-point correlation functions among particles confined to move within a spherical two-dimensional space are studied here using Monte Carlo simulations in the canonical ensemble and the corresponding liquid theory concepts. This work takes a simple model system with soft-sphere interactions among the particles ly…
X-ray photoelectron spectroscopy has been used to measure the valence band offset at the ZnO∕GaAs heterojunction interface. The valence band offset is determined to be 2.39±0.23eV. As a consequence, a type-II heterojunction with a conduction band offset of −0.44±0.23eV is found. The directly obtained value is in good…
Acoustic emission measurements are combined with strain, dielectric, and polarization measurements to detect phase transitions in 0.94Na0.5Bi0.5TiO3–0.06BaTiO3 single crystals during thermal cycling as well as electric field cycling at both room temperature and 140°C. All phase transitions known from the literature (c…
Constant-potential electrochemical synthesis of ZnO on metal substrates enables selective formation of either Ohmic or Schottky-barrier contacts. Using a mildly acidic nitrate-based aqueous electrolyte, there is a substrate-dependent deposition potential below which electrodeposited ZnO heterojunctions display Schottk…
The surfaces of epitaxial BaTiO3 films on SrTiO3 substrates were investigated by x-ray reflectivity (XRR) and angle-resolved x-ray photoelectron spectroscopy (ARXPS). It was shown by XRR analysis that there exists a low electron density surface layer (about 87%–93% of the electron density of the underneath BaTiO3 laye…
The photoabsorption spectra of a continuous series of Na(n) clusters (n<or=14, n=20, n=40) have been calculated using a time-dependent density-functional scheme. Accordingly, we present these spectra and show that they are in very good agreement with other theoretically and experimentally obtained photoabsorption spec…
Abstract Three discrete dinuclear copper(II)–lanthanide(III) complexes, namely, [CuLn(mmi) 2 (NO 3 ) 3 (H 2 O) 2 ] [Ln = La ( 1 ), Sm ( 2 )] and [CuGd(mmi) 2 (NO 3 ) 2 (H 2 O) 3 ][NO 3 ] ( 3 ) (Hmmi = 2‐hydroxymethyl‐1‐methylimidazole) were synthesized and structurally characterized by X‐ray diffraction analysis. In t…
Metal-insulator-metal capacitors with high-k Ba[(Ni1∕2,W1∕2)0.1Ti0.9]O3 thin film dielectrics were fabricated by chemical solution deposition technique. High dielectric constant (85), low dielectric loss (0.007), and high breakdown field (∼3.0MV∕cm) at room temperature were achieved. The temperature and frequency depe…
Abstract The thermal behavior of the metallomesogens [Ln(C 12 C 16 dbm) 3 (phen)] (Ln = La, Nd, Eu, Gd, Tb, Dy, Er, Yb; C 12 C 16 dbm = 1‐(4‐dodecyloxyphenyl)‐3‐(4‐hexadecyloxyphenyl)propane‐1,3‐dionate; phen = 1,10‐phenanthroline) was investigated. The complexes of the light lanthanides (Ln = La, Nd) are not mesomorp…
Abstract Three tricyanometalate precursors, (Bu 4 N)[(PhTp)Fe(CN) 3 ] · H 2 O ( 1 ), (Bu 4 N)[(MeTp)Fe(CN) 3 ] ( 2 ), and (Bu 4 N)[( i BuTp)Fe(CN) 3 ] ( 3 ) [Bu 4 N + = tetrabutylammonium cation; PhTp = tris(pyrazolyl)phenylborate; MeTp = methyltris(pyrazolyl)borate; i BuTp = 2‐methylpropyltris(pyrazolyl)borate], were…
Using the density-functional theory combined with the nudged elastic band method, we have calculated migration pathways and estimated the activation energy barriers for the diffusion of Ag ions in low-temperature Ag2S. The activation energy barriers for four essential migrations for an Ag ion, namely, from a tetrahedr…