Materials Literature
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Folic acid, attached to polyethyleneglycol-derivatized, distearoyl-phosphatidylethanolamine, was used to target in vitro liposomes to folate receptor (FR)-overexpressing tumor cells. Confocal fluorescence microscopic observations demonstrated binding and subsequent internalization of rhodamine-labeled liposomes by a h…
Coating extremely thin degradable template polymer fibers with the desired wall materials forms the basis of the straightforward and highly versatile method described here for the production of polymer, metal, and hybrid nano- and mesotubes. Tubes with highly structured inner surfaces (see Figure) may be fabricated, w…
OBJECTIVE: In tissue engineering, three-dimensional biodegradable scaffolds are generally used as a basic structure for cell anchorage, cell proliferation and cell differentiation. The currently used biodegradable scaffolds in cardiovascular tissue engineering are potentially immunogenic, they show toxic degradation a…
1,2-Bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene ( 1a ) and their derivatives, 1,2-bis(2-methyl-5- p -tolyl-3-thienyl)perfluorocyclopentene ( 2a ) and 1,2-bis(2-methyl-5- p - tert -butylphenyl-3-thienyl)perfluorocyclopentene ( 3a ), were found to undergo reversible photochromic reactions in the single-crystal…
Different compositions of wheat thermoplastic starch (TPS) and polycaprolactone (PCL) are melt blended by extrusion and injected. Different properties are determined: mechanical properties (tensile and impact tests), thermal and thermomechanical properties (DSC and DMTA) and hydrophobicity (contact angle measurement).…
Temperature dependent measurements of the electrical resistance have been employed to study structural changes in sputtered Ge2Sb2Te5 films. The pronounced changes of film resistance due to structural changes enable a precise determination of transition temperatures and activation energies. Furthermore the technique i…
Can carbon nanotubes be efficient structural reinforcements for high-strength polymer composites? Here it is shown that, during loading, individual single-walled nanotubes pull out of their bundles (see Figure), making load transfer difficult. It is thus concluded that the effectiveness of reinforcement is determined…
We demonstrate a composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability &mgr;(eff)(omega) and permittivity varepsilon(eff)(omega)…
Based on a model Hamiltonian with the nearest-neighbor Coulomb interaction of the itinerant e g electrons, we investigated the possibility of the coexistence of the charge-ordering phase and the antiferromagnetic phase for the manganites R 1-x A x MnO 3 with the doping of x = 0.5. Three different types of the magnetic…
The compound dimethyl-2-iodobenzoylphosphonate is unusual in that it forms well-ordered crystals that clearly show short iodine-oxygen interactions in which both the iodine and the oxygen are in their normal oxidation states. These interactions were studied using a new hybrid quantum mechanical–molecular mechanical ap…
The mean free path of phonons in superlattices is estimated. It is shown to be strongly dependent on the superlattice period due to the Umklapp scattering in subbands. It first falls with increasing the superlattice period until it becomes comparable with the latter after what it rises back to the bulk value. Similar…
Copper dissolution was investigated using electrochemical techniques including potentiodynamic scans and electrochemical quartz crystal analysis. The adsorption of iodate on a copper surface depends on the solution pH and the concentration of iodate. IO 3 - behaves both as an oxidizer and a passivating agent for coppe…
The reaction of methanol with oxygen on Pt(111) under ultrahigh vacuum condition has been investigated by infrared reflection absorption spectroscopy (IRAS). Molecular and atomic states of adsorbed oxygen existed on the Pt(111) surface, and the adsorption of oxygen at 100 K gave molecularly adsorbed oxygen that dissoc…
Spacer dependence of intersystem crossing (ISC) affected by a remote metal unpaired electron was studied in a series of copper(II) porphyrin−free base porphyrin dimers. In these dimers, fluorescence of the free base moiety is remarkably quenched by the copper counterpart which is linked via a phenanthrene, a naphthale…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTLong-Term Volume Relaxation of Bisphenol A Polycarbonate and Atactic PolystyreneChristopher G. Robertson and Garth L. WilkesView Author Information Polymer Materials and Interfaces Laboratory, Chemical Engineering Department, Virgin…
In this paper, we demonstrated that supramolecular structures of amphiphilic tripeptides can be effectively modulated by selecting the appropriate casting solvents. The tripeptide derivatives having an ammonium head and hydrophobic tails were dispersed in three kinds of solvents (nonpolar, medium nonpolar, and polar)…
The influence of the poly(α-pinene), a natural polyterpene, on growth rate of isotactic polypropylene spherulites was investigated using a dynamic solidification method. It was shown that the use of a constant cooling rate allows the obtainment of reliable growth rate data and permits one to enormously enlarge the ran…
The existence of the core−shell double gyroid morphology is proven by transmission electron microscopy and computer simulation for a linear SBV triblock copolymer and a SBV heteroarm star terpolymer, where S is polystyrene, B is poly(1,2-butadiene), and V is poly(2-vinylpyridine).
In seeking validation of Dissipative Particle Dynamics (DPD) for the mesoscopic modeling of multiphase fluid−fluid systems in external fields, simulations of a pendant drop and a drop in simple shear flow have been performed. The shape profile of the simulated pendant drop was found to be in perfect agreement with tha…
On the basis of the experimentally determined phase behavior in blends of polystyrene and random copolymers of styrene and 4-vinylpyridine, i.e., P(S x - co -4VP 1 - x )/PS, the Flory−Huggins interaction parameter is demonstrated to satisfy 0.30 < χ S,4VP ≤ 0.35. This value is substantially smaller than reported befor…