Materials Literature
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The outermost member of the 112 family LaBaCo 2 O 5.5 has been synthesized using a multistep method to stabilize its structure. Its structural study, combining neutron powder diffraction and electron microscopy, shows that its orthorhombic matrix consists of layers of corner-shared CoO 6 octahedra interconnected throu…
n-Type doping of CdSe nanowires is achieved by either co-evaporating indium at different temperatures during growth, or post-growth doping via a thermal diffusion process. The conductivity of CdSe nanowires is tuned reproducibly by nearly five orders of magnitude in a controlled way, and carrier concentration as high…
We report upper critical field ${B}_{c2}(T)$ data for disordered (arsenic-deficient) ${\mathrm{LaO}}_{0.9}{\mathrm{F}}_{0.1}{\mathrm{FeAs}}_{1\ensuremath{-}\ensuremath{\delta}}$ in a wide temperature and magnetic field range up to 47 T. Because of the large linear slope of ${B}_{c2}\ensuremath{\approx}\ensuremath{-}5.…
The self-assembly of molecules in a gel by strong pi-pi stacking interactions between the thienylvinylene anthracene backbones and van der Waals interactions between the long alkyl chains has generated nanofibers; from the organogels, organic single-nanofiber transistors were successfully embodied.
In this paper, the synthesis of a new type of intrinsically chiral, directly beta,beta'-linked, octa-meso-aryl-substituted bisporphyrins is described, by using an optimized Suzuki-Miyaura coupling procedure. This strategy leads to a broad variety of such axially chiral 'superbiaryls', differing in their metalation sta…
A new pregnanone, named calotropone (1), was isolated from the EtOH extract of the roots of Calotropis gigantea L. together with a known cardiac glycoside. The structures were elucidated by a study of their physical and spectral data. Compounds 1 and 2 displayed inhibitory effects towards chronic myelogenous leukemia…
A short Bi doped fiber laser operating in the wavelength region of 1160-1179 nm has been demonstrated. The influence of unsaturable loss on laser performance is investigated. Excited state absorption in Bi doped germano-alumino silicate fiber is reported in the 900-1300 nm wavelength range under 800 and 1047 nm pumpin…
Ligand exchange reactions of Au 25 (SCH 2 CH 2 Ph) 18 with hexanethiol (HSC6) and thiophenol (HSPh) as incoming ligands, and Brust reaction nanoparticle syntheses using mixtures of thiols (HSCH 2 CH 2 Ph and HSC6), produce nanoparticles having different, ideally statistically determined, relative populations of the tw…
Through the utilization of a mixed solvent system, consisting of a good solvent (DMSO) with either a nonsolvent (water) or a poor solvent (ethylene glycol), the morphology and properties of a class of stimuli-responsive metallo-supramolecular gels can be systematically tailored. These gels are formed via self-assembly…
Highly active and stable Ni−Cu−SiO 2 catalysts are prepared by a coprecipitation method and are employed for direct decomposition of methane to hydrogen and carbon nanofibers at 650 °C and atmospheric pressure. The influence of Cu content is investigated over Ni−Cu−SiO 2 samples with different Cu/Si ratios. The activi…
One of the most challenging problems in understanding the structural phase transformations in Pu is to determine the energetically favored, continuous atomic pathways from one crystal symmetry to another. This problem involves enumerating candidate pathways and studying their energetics to garner insight into instabil…
Exchange bias effect is an important attribute in several device applications. Traditionally, it is discussed as a form of exchange anisotropy at the interface between the ferromagnetic/antiferromagnetic layers of two distinct systems. We report here on the magnetically ordered alloys possessing the feature of unidire…
In the admixed Nd0.75Ho0.25Al2 system, magnetic moments of Nd and Ho occupying the same crystallographic site are antiferromagnetically coupled and the chosen stoichiometry displays a magnetic compensation behavior (Tcomp of about 24 K) in all orientations. In the vicinity of Tcomp, the conduction electron polarizatio…
Carbon nanotubes (CNTs) have large intrinsic carrier mobility due to weak acoustic phonon scattering. However, unlike two-dimensional metal-oxide-semiconductor field effect transistors (MOSFETs), substrate surface polar phonon (SPP) scattering has a dramatic effect on the CNTFET mobility, due to the reduced vertical d…
Freezing is a fundamental physical phenomenon that has been studied over many decades; yet the role played by surfaces in determining nucleation has remained elusive. Here we report direct computational evidence of surface induced nucleation in supercooled systems with a negative slope of their melting line (dP/dT < 0…
In this paper, CoO, Co 3 O 4, Ni(OH) 2, and Mg(OH) 2 nanotubes were synthesized by solvothermal treatment of corresponding colloidal hydroxide. These nanotubes were characterized by powder X-ray diffraction (XRD), selected area electron diffraction (SAED), and transmission electron microscopy (TEM). According to the t…
One of the most promising applications of nanotechnology is that of drug delivery, and in particular the targeted delivery of drugs using nanotubes. Functionalized nanotubes might be able to target specific cells, become ingested, and then release their contents in response to a chemical trigger. This will have signif…
A two-orbital model for Fe-pnictide superconductors is investigated using computational techniques on two-dimensional square clusters. The hopping amplitudes are derived from orbital overlap integrals, or by band structure fits, and the spin frustrating effect of the plaquette-diagonal Fe-Fe hopping is remarked. A spi…
Biodegradable poly(L-lactide) (PLLA)/multiwalled carbon nanotubes (MWNTs) nanocomposites were prepared via solution blending using two kinds of MWNTs, i.e., pristine multiwalled carbon nanotubes (p-MWNTs) and carboxyl-functionalized multiwalled carbon nanotubes (f-MWNTs). Various techniques were used to investigate th…
We investigated the metal-ordered manganite system ${\text{YBaMn}}_{2}{\text{O}}_{6}$ using electron spin resonance (ESR) in the paramagnetic regime across the charge ordering and structural phase transition at ${T}_{\text{CO}}=480\text{ }\text{K}$ and ${T}_{t}=520\text{ }\text{K}$, respectively. All ESR parameters ex…