Materials Literature
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In this study, the polyester urethane Degrapol (DP) was explored for medical applications. Electrospun DP-fiber fleeces were characterized with regard to fiber morphology, swelling, and interconnectivity of interfiber spaces. Moreover, DP was assayed for cell proliferation and hemocompatibility being a prerequisite to…
The ability to introduce substituents at designated sites about the perimeter of the chlorin or 13(1)-oxophorbine macrocycle is essential for fundamental studies related to chlorophylls. A chlorin is a dihydroporphyrin, whereas a 13(1)-oxophorbine is a chlorin containing an annulated oxopentano ring spanning positions…
Simulation results of near infrared (100- to 200-THz) fishnet-structure negative-index metamaterials (NIMs) with single and multiple functional layers exhibit bi-anisotropy - inhomogeneous asymmetry - due to the presence of a sidewall-angle. The influence of sidewall-angle resulting from realistic fabrication processe…
Abstract Two novel phosphorus‐functionalized aromatic diamines, 1,1‐bis(4‐aminophenyl)‐1‐(6‐oxido‐6H‐dibenz <c,e> <1,2> oxaphosphorin‐6‐yl)ethane ( 1 ) and bis(4‐aminophenyl)‐(6‐oxido‐6H‐dibenz <c,e> <1,2> oxaphosphorin‐6‐yl)phenylmethane ( 2 ), were prepared from 9,10‐dihydro‐oxa‐10‐phosphaphe…
Scanning electrochemical microscopy (SECM) is employed to characterize the transport of redox-active probe ions through quenched polyelectrolyte brushes. The counterion exchange through polyelectrolyte brushes is also investigated by infrared spectroscopy in attenuated total reflection (FTIR-ATR), X-ray photolectron s…
Abstract The effect of hydrocarbon oil incorporation on the rheological and phase behaviors of poly(styrene‐ b ‐(ethylene‐ co ‐butylene)‐ b ‐styrene) (SEBS) has been investigated. SEBS‐A1 (neat SEBS) shows a presence of very long relaxation time mode even at the highest temperature carried out here. On the other hand,…
Nanocrystals of thermodynamically stable alpha-MnAs (hexagonal NiAs-type) and metastable beta-MnAs (orthorhombic MnP-type) have been synthesized by the reaction of triphenylarsine oxide (Ph(3)AsO) and dimanganesedecacarbonyl (Mn(2)CO(10)) at temperatures ranging from 250 to 330 degrees C in the presence of the coordin…
We report an approach of exploring the interaction between cationic surfactants and a type of structurally well-defined, spherical "Keplerate" polyoxometalate (POM) macroanionic molecular clusters, {Mo72V30}, in aqueous solution. The effectiveness of the interaction can be determined by monitoring the size change of t…
The interaction of nitrogen oxides NO x ( x = 1−3) with γ-Al 2 O 3 has been investigated using first-principles density functional theory calculations. NO and NO 2 weakly physisorb on the clean, dehydrated (100) and (110) surfaces of γ-Al 2 O 3, whereas the adsorption of the NO 3 radical is rather strong. Only the bas…
Magnesium tetraphenylporphyrin (MgTPP) was synthesized from meso-tetraphenylporphyrin (H(2)TPP) in N,N-dimethylformamide (DMF). The photochemical properties of MgTPP in the presence of oxygen were investigated in dichloromethane (CH(2)Cl(2)) by conventional fluorescence, UV-vis, (1)H NMR, MALDI-TOF-MS, FTIR, and XPS s…
In this work, colloidal spheres with different average diameters were prepared by using azo polymers (BP-AZ-CA and BP-AZ-NT) and photoinduced deformation behavior of the colloidal spheres was studied. The colloidal spheres were prepared through gradual hydrophobic aggregation of the polymeric chains in THF/H2O media a…
In our previous study, we found that modification of poly(butylene succinate) (PBS) by introducing urethane and isocyanate groups is an effective method for improving the mechanical properties and water resistance of soy-protein-based bioplastics. This study presents the effects of the structure and content of PBS com…
The metal-insulator (MI) transition in epitaxial thin films of ${\text{La}}_{0.75}{\text{Ca}}_{0.25}{\text{MnO}}_{3}$ (LCMO) is accompanied by the appearance of an intrinsic electrical nonlinearity. The latter, probed by electrical third harmonic voltage, ${U}_{3\ensuremath{\omega}}$, or resistance, ${R}_{3\ensuremath…
Abstract A series of new norbornene carboxylic cholesteryl ester monomers with and without alkyl spacers, NBCh, and NBCh‐n , respectively, were synthesized. New side‐chain liquid crystalline homopolymers, PNBCh and PNBCh‐n , were cleanly prepared using NBCh and NBCh‐n , respectively, with Grubbs 2nd generation catalys…
Isothermal compression of poly (dimethylsiloxane), 1,4-poly(butadiene), and a model Estane (in both pure form and a nitroplasticized composition similar to PBX-9501 binder) at pressures up to 100 kbars has been studied using atomistic molecular dynamics (MD) simulations. Comparison of predicted compression, bulk modul…
Abstract The synthesis of four shape‐switchable macrocycles comprising different peripheral substituents is described. The macrocycles 1 – 4 consist of m ‐terphenyl semicircles interlinked by two azo joints. These macrocycles were assembled from nitro‐functionalized m ‐terphenyl moieties through reductive dimerization…
This paper discusses an effective method to prepare cross-linked isotactic polypropylene (PP-X) with high purity (almost 100% gel content and no contamination) and high melting temperature and crystallinity. The reaction scheme involves a linear poly(propylene- co - p -(3-butenylstyrene)) copolymer (PP-BSt) containing…
We formulate a symmetry principle on the basis of the duality of electric and magnetic fields and apply it to dispersion forces. Within the context of macroscopic quantum electrodynamics, we rigorously establish duality invariance for the free electromagnetic field in the presence of causal magnetoelectrics. Dispersio…
Plasmonic nanocomposites, comprising metallic clusters within a semiconductor matrix, exhibit a huge discrepancy between characteristic energies of luminescence, absorption, and generation of photocarriers. This phenomenon, discovered experimentally in InN/In and supported by GaAs/In data, appears because the optical…
A detailed experimental and theoretical study of the linear and nonlinear optical properties of different Fibonacci-spaced multiple-quantum-well structures is presented. Systematic numerical studies are performed for different average spacing and geometrical arrangement of the quantum wells. Measurements of the linear…