Materials Literature
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A two-dimensional liquid crystal (LC) laser array has been demonstrated by photopumping a single LC sample using a lenslet array consisting of plano-convex microlenses. A 5 x 5 array of LC lasers (displaying evidence of mutual coherence) spaced by 1 mm inactive regions has been generated, which could be combined to yi…
Metamagnetic transition was observed in low magnetic field for La0.7Ca0.3MnO3−δ lanthanum manganite prepared by solid-state technology. Magnetization shape causes giant low field magnetocaloric effect at Curie temperature TC=242K. Magnetic entropy changes ΔSm, deduced with isothermal magnetization curves, are equal to…
Optical and field emission (FE) properties of aligned single-crystalline ZnO nanorods, grown on aluminium substrate at 530 °C by the non-catalytic thermal evaporation process, have been examined. Raman-scattering and room-temperature PL spectra exhibit a strong and sharp optical phonon E2 mode at 437 cm−1 and a strong…
Two dipeptides containing an N-terminally positioned ω-amino acid residue (β-alanine/δ-amino valeric acid) self-assembles to form nanotubes in the solid state as well as in aqueous solution. In spite of having hollow nanotubular structures in the solid state and in solution, their self-assembling nature in these two s…
We have developed a new intermediate monomer, 2,7-[bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-bis(3-(tert-butyl propanoate))]fluorene, that allows the easy synthesis of water-soluble carboxylated polyfluorenes. As an example, poly[9,9'-bis(3''-propanoate)fluoren-2,7-yl] sodium salt was synthesized by the Suz…
The Jahn-Teller distortion in praseodymium dioxide $(\mathrm{Pr}{\mathrm{O}}_{2})$ has been studied using density functional theory with the $\mathrm{PBE}+U$ functional for the exchange-correlation energy. Various possible distortions were suggested based on recent neutron diffraction experiments [C. H. Gardiner et al…
A cell wall hydrolase homologue, Bacillus subtilis YddH (renamed CwlT), was determined to be a novel cell wall lytic enzyme. The cwlT gene is located in the region of an integrative and conjugative element (ICEBs1), and a cwlT-lacZ fusion experiment revealed the significant expression when mitomycin C was added to the…
High Resolution Image Download MS PowerPoint Slide We clarified the relationship between near-field optical properties and the local structure in monolayer assembly of gold nanoparticles by using scanning near-field optical microscopy (SNOM) and scanning electron microscopy (SEM). The success of superposition of the S…
Naive mode coupling theory (NMCT) and the nonlinear stochastic Langevin equation theory of activated dynamics have been generalized to mixtures of spherical particles. Two types of ideal nonergodicity transitions are predicted corresponding to localization of both, or only one, species. The NMCT transition signals a d…
The exciton dynamics of CdSe nanocrystals are intimately linked to the surface morphology. Photo-oxidation of the selenium surfaces of the nanocrystal leads to an increase in radiative decay efficiency from both the band edge and deep trap emission states. The addition of the primary amine hexadecylamine curtails nonr…
An octamolybdate-containing noncovalently assembled framework with the formula (Hcpy) 3 [Ag(β-Mo 8 O 26 )] ( 1 ) (cpy = 4-(5-chloropyridin-2-yl)pyridine) is synthesized and characterized. Compound 1 comprises a three-dimensional supramolecular network constructed from one-dimensional {[Ag(β-Mo 8 O 26 )] 3− } ∞ anionic…
Water soluble fluorescent nanocrystals were obtained by encapsulation of hydrophobic quantum dots (QDs) with amphiphilic phospholipids derived from the ring opening metathesis of norbornene-based monomers. The robustness of the newly coated quantum dots was assessed by comparative studies under various ionic condition…
The generalized Thomas-Kuhn sum rules are used to eliminate the explicit dependence on dipolar terms in the traditional sum-over-states (SOS) expression for the second hyperpolarizability to derive a new, yet equivalent, SOS expression. This new dipole-free expression may be better suited to study the second hyperpola…
The simultaneous measurement of wide-angle (WAXS) and small-angle X-ray scattering (SAXS) patterns has been made successfully for the first time for the uniaxially oriented δ (filled clathrate) and δ e (emptied clathrate) forms during the heating process. The basic idea behind these measurements is to clarify the corr…
An analytical model has been developed to describe the interaction between rigid ammonia molecules including the explicit description of induction. The parameters of the model potential were chosen by fitting high quality ab initio data obtained using second-order Møller-Plesset (MP2) perturbation theory and extended…
In the current research, we have successfully fabricated single-crystalline triclinic Mg 2 B 2 O 5 and orthorhombic Mg 3 B 2 O 6 nanorods by a solvothermal method under supercritical conditions. Detailed microstructures of as-synthesized products were characterized by X-ray diffraction, scanning electron microscopy (S…
Protein adsorption to surfaces prepared by chemisorption of thiol-terminated poly(ethylene glycol) (HS-PEG 650 -OH) to gold-coated silicon wafers followed by functionalization of the terminal PEG OH groups with aliphatic polyester dendrons was investigated. Chemisorption of HS-PEG 650 -OH to the gold surfaces was carr…
Hyperbranched polymers with a degree of branching of 100% have been prepared and converted into different types of unimolecular micelle-like structures. The polymers were obtained by acid catalyzed polycondensation of an isatin-based AB2 monomer, prepared without using toxic organometal reagents or extensive chromatog…
Ferromagnetic and ferroelectric characteristics of Gd substituted nickel ferrite (NiO⋅Fe1.925Gd0.075O3) were investigated. The material formed in the cubic inverse spinel phase and in addition, a small amount of GdFeO3 phase was identified. A small distortion of the cubic lattice was observed upon the substitution of…
Titanium-containing nanocomposites have been synthesized by calcination of a Ni−Ti layered double hydroxide as precursor. The nanocomposites were characterized by powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HRTEM), the Brunauer−Emmett−Teller (BET) method, and UV−vis diffuse refle…