Materials Literature
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A cyclic indole tetramer has been synthesized via an iridium-catalysed C–H borylation–cross coupling sequence. The tetraindole has a highly distorted structure, but can be oxidized with bromine and water into a highly planar macrocycle. The oxidized macrocycle can capture metal ions in its inner cavity as a novel porp…
A method of securing the adhesion of biodegradable polymer coating was investigated for drug-eluting metal stents, using surface-initiated ring-opening polymerization (SI-ROP) of L-lactide. Introduction of oligolactide on the stainless steel (SS) surface was successful and the thickness of the oligolactide grafts rema…
This research aims at providing evidence of particle suspension contributions to emulsion stability, which has been cited as a contributing factor in crude oil recovery by low-salinity waterflooding. Kaolinite and silica particle dispersions were characterized as functions of brine salinity. A reference aqueous phase,…
We investigated binding of hydrogen atoms to small polycyclic aromatic hydrocarbons (PAHs)--i.e., graphene dots with hydrogen-terminated edges--using density functional theory and correlated wavefunction techniques. We considered a number of PAHs with three to seven hexagonal rings and computed binding energies for mo…
The photochromism of heterogeneous silver nanoparticles grown thermally in mesoporous TiO2 films is investigated under visible laser illuminations with different irradiances. At low irradiance, a selective oxidation occurs that changes the film color in accordance with the illuminant wavelength. At higher irradiance,…
Ruddlesden-Popper (R.P.) type faults have been investigated for Sr-excess SrTiO3 (STO) homoepitaxial thin films by pulsed laser deposition (PLD) and tuning of the laser fluence. The R.P. type fault structures were found to depend on the amount of excess Sr. The growth direction of the planer faults changed from normal…
The glass transition dynamics of stacked thin films of polystyrene and poly(2-chlorostyrene) were investigated using differential scanning calorimetry and dielectric relaxation spectroscopy. The glass transition temperature T(g) of as-stacked thin polystyrene films has a strong depression from that of the bulk samples…
Abstract Well‐defined boehmite (γ‐AlOOH) nanomaterials with regular shapes, which include nanorods, nanobelts, and nanoplates, were prepared by hydrothermal reactions of γ‐AlOOH nanoparticles, to which H 2 SO 4 , CH 3 COOH, and HCl were added to regulate the shape of the products. The formation of the nanomaterials wi…
The location of the triple line as a function of time has been recorded for a series of organic liquids, with various surface tension to viscosity ratios, wicking upward a rough Cu(6)Sn(5)/Cu intermetallic (IMC) substrate. The complex topographical features of such an IMC rough surface are characterized by surface por…
By extensive studies of both neutron and synchrotron X-ray diffraction, we discover that the structure deviates from well-known Debye-Gruneissen predictions below<em> T</em><sub>N</sub> in multiferroic BiFeO<sub>3</sub>. At the same time, it exhibits a magnetoelastic effect of ∼0.4%, when it undergoes a spiral magneti…
Novel double-tunnel compounds A x RE 2 Cu 6 –x Te 6 (A = K–Cs; RE = La–Nd) have been synthesized from the elemental mixtures in the ACl flux at 1123 K and crystallized in the hexagonal P 6 3 / m, with a = 9.955(3)–10.0841(6) Å, c = 4.1487(6)–4.2366(6) Å, and Z = 1. A nice reconstruction of the CuTe 4 -based anionic ne…
Films of pure and doped Polyvinyl alcohol (PVA) with different concentration of Nickel Chloride (NiCl2) were prepared using the casting technique, in order to investigate the effect of NiCl2 additions on the optical properties of PVA host. The dispersion studies of pure PVA film and PVA films doped with NiCl2 were stu…
The influence of amorphous carbon on FePt catalyst particles under chemical vapor deposition conditions typically applied for CNT growth is examined through two routes. In the first, FePt catalyst particles supported on alumina are exposed to a well-established cyclohexane thermal CVD reaction at various temperatures.…
Cationic conjugated polyelectrolytes (CPEs) containing an iridium complex ((ppy) 2 Ir(FlPy)) as the energy acceptor were synthesized via Suzuki coupling reaction. The polymer with 12 mol % (ppy) 2 Ir(FlPy) ( P4 ) shows efficient intrinsic fluorescence resonance energy transfer (FRET) in aqueous solution due to the sol…
We investigate the neutron scattering spectrum in iron pnictides based on the random-phase approximation in the five-orbital model with a realistic superconducting (SC) gap, $\ensuremath{\Delta}=5\phantom{\rule{4.pt}{0ex}}$meV. In the normal state, the neutron spectrum is suppressed by large inelastic quasiparticle (Q…
Because of their potential application as new electrical materials that depend on their redox properties, π-conjugated polymers and oligomers have attracted much attention. Polyanilines, which are chemically stable, are one of the promising classes of conducting π-conjugated polymers. Polyanilines exist in three diffe…
The influence of plasmon excitations in spherical gold nanoparticles on the optical properties of a light-harvesting complex 2 (LH2) from the purple bacteria Rhodopseudomonas palustris has been studied. Systematic analysis is facilitated by controlling the thickness of a silica layer between Au nanoparticles and LH2 c…
We show that the dynamics of soft-sphere systems with purely repulsive interactions can be described by introducing an effective hard-sphere diameter determined using the Andersen-Weeks-Chandler approximation. We find that this approximation, known to describe static properties of liquids, also gives a good descriptio…
SnO 2 and Mn-doped SnO 2 thin films have been grown by radio frequency sputtering in two different atmospheres (Ar and Ar/O 2 ) on Si(100) and Al 2 O 3 (R-cut) at room temperature (RT) and at 500 °C. The RT films are amorphous; those grown at 500 °C are polycrystalline or epitaxial, depending on the substrate. All the…
Spider dragline silk is a self-assembling tunable protein composite fiber that rivals many engineering fibers in tensile strength, extensibility, and toughness, making it one of the most versatile biocompatible materials and most inviting for synthetic mimicry. While experimental studies have shown that the peptide se…