Materials Literature
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We studied the self-diffusion of colloidal ellipsoids in a monolayer near a flat wall by video microscopy. The image processing algorithm can track the positions and orientations of ellipsoids with subpixel resolution. The translational and rotational diffusions were measured in both the laboratory frame and the body…
We take the resistivity $(\ensuremath{\rho})$ and the current-voltage $(I\text{\ensuremath{-}}V)$ characteristics of a ${\text{SmFeAsO}}_{0.85}$ single crystal as a function of temperature $(T)$ for various magnetic fields up to 18 T along the $c$ axis. The tail region of $\ensuremath{\rho}(T)$ well fits the three-dim…
Uniform ZnO/ZnFe 2 O 4 fluorescent magnetic composite hollow nanopsheres can be successfully fabricated using carbonaceous nanospheres as templates, which are synthesized via a hydrothermal approach. The ZnO/ZnFe 2 O 4 composited nanoarchitectures show fluorescent and magnetic properties for improved physical and chem…
Using surface enhanced Raman spectroscopy (SERS), we observed Raman enhancements (10 4 −10 5 ) for pyridine molecules adsorbed on II−VI semiconductor quantum dots on (uncapped CdSe/ZnBeSe) produced by molecular beam epitaxy. When a monolayer of pyridine is adsorbed on these structures, excitation at 488 nm produces in…
Poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) fibers containing carbonated hydroxyapatite (CHA) nanoparticles with different CHA amounts (5, 10 and 15 wt%) were electrospun with the aid of ultrasonic power for dispersing the nanoparticles. Scanning electron microscopy and energy-dispersive x-ray spectroscopy results…
We investigated the correlation between the time evolution of the different phase-separating morphologies and corresponding linear and transient rheological behaviors for the dynamically asymmetric PS/PVME blend in which there is a large difference between glass transitions of the pure components (about 125 °C). The p…
A planar infrared photodetector consisting of discrete films of PbS quantum dots (QDs) and the fullerene derivative, PCBM, is reported. A fast recombination process at the PbS QD/PCBM interface enables an improvement in the response speed of greater than two orders-of-magnitude over devices consisting only of the QD f…
Over the past few years, CdTe quantum dots have been demonstrated as powerful probes for biophotonics applications. The aqueous phase synthesis technique remains the best approach to make high quality CdTe QDs in a single-pot process. CdTe QDs prepared directly in the aqueous phase can have quantum yield as high as 80…
Abstract We have prepared a new class of polybenzoxazine/POSS nanocomposites through the reactions of a multifunctional vinyl‐terminated VBa‐POSS with a VBa monomer at various compositional ratios. The incorporation of the silsesquioxane core units into the polybenzoxazine matrix significantly hindered the mobility of…
Electrospinning of fibrous tissue engineering scaffolds has been traditionally conducted using positive voltages. In the current study, positive voltage (PV) electrospinning and negative voltage (NV) electrospinning were investigated for forming fibrous membranes of poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV). In…
In situ Fourier transform infrared spectroscopy has been employed to investigate the adsorption and thermal decomposition of lactic acid and poly(lactic acid) on TiO 2 with and without O 2 . Lactic acid dissociates primarily by deprotonation of COOH to form lactate (CH 3 CH(OH)COO) on TiO 2 and by O−H (alcohol’s funct…
A comparative IR and NMR study of two low-molecular-weight organogels (LMWGs) based on aminoacid derivatives let us point out the hierarchy of the gelation assembly process. Different association states of corresponding organogelator molecules can be observed leading to the supramolecular organization of gel. A first…
We theoretically demonstrate the capability of a ferromagnetic-normal interface in graphene to focus an electron wave with a certain spin direction. The essential feature is the negative refraction Klein tunneling, which is spin resolved when the exchange energy of ferromagnetic graphene exceeds its Fermi energy. Expl…
Magnetic field is an effective stimulus to assemble magnetic colloidal particles into ordered structures that can display field-responsive photonic properties. Magnetic assembly thus represents a powerful method to produce novel photonic materials with wide applications ranging from various types of color displays to…
Heteroepitaxy can involve materials with a misfit of crystal structure. Rotation domains in the epilayer are a fundamental consequence. We derive a general expression for their (minimum) number which is determined by the mismatch of the rotational symmetries of the substrate and epilayer. In the case of a mismatch of…
Zirconium diboride (ZrB 2 ) ceramics were densified by pressureless sintering (PS), hot pressing, or spark plasma sintering (SPS) of powders with a range of starting particle sizes and oxygen contents. Microstructural analysis of the ZrB 2 ceramics revealed a wide range of final grain sizes. SPS resulted in an average…
Layer multiplying coextrusion was used to create films with hundreds or thousands of alternating layers of two polymers. The constituent polymers were chosen to create a temperature window in which a crystallizable polymer could melt and recrystallize within the glassy confinement of an amorphous polymer. This enabled…
In this work, the synthesis and characterization of three-dimensional hetergeneous graphene nanostructures (HGN) comprising continuous large-area graphene layers and ZnO nanostructures, fabricated via chemical vapor deposition, are reported. Characterization of large-area HGN demonstrates that it consists of 1-5 layer…
Three high-nuclearity mixed valence manganese(II/III) coordination clusters, have been synthesised, that is, [Mn(III) (6)Mn(II) (4)(μ(3)-O)(4)(HL(1))(6)(μ(3)-N(3))(3)(μ(3)-Br)(Br)](N(3))(0.7)/(Br)(0.3)⋅3 MeCN⋅2 MeOH (1) (H(3)L(1)=3-methylpentan-1,3,5-triol), [Mn(III) (11)Mn(II) (6)(μ(4)-O)(8)(μ(3)-Cl)(4)(μ,μ(3)-O(2)CM…
Nitride phosphor SrAlSi 4 N 7 :Eu 2+ was synthesized by gas pressure sintering of powder mixtures of Sr 3 N 2 , AlN, α‐Si 3 N 4 , and EuN at 1750°C under 0.48 MPa N 2 . The photoluminescent properties of SrAlSi 4 N 7 :Eu 2+ were measured and analyzed. Two‐peak emission from Eu 2+ located at two different Sr sites in t…