Materials Literature
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Room-temperature addition of 1-undecanol (UD-OH), 1-hexadecanol (HD-OH), 1-octanol (OC-OH), and 1,12-dodecanediol DD-(OH) 2 completely quenched the photoluminescence of silicon nanocrystallites, Si-nc. Heating Si-nc with UD-OH, HD-OH, and OC−OH resulted in the partial recovery of the photoluminescence and in the forma…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTransfer of Chirality from Circularly Polarized Light to a Bulk Material Property: Propagation of Photoresolution by a Liquid Crystal TransitionKikue S. Burnham and Gary B. SchusterView Author Information Department of Chemistry and Biochemistry Georgia Institute of Te…
We report the preparation, crystallization, and solid-state characterization of a spiro-biphenalenyl radical. The crystal structure shows that the radical is monomeric in the solid state and without intermolecular contacts that fall within the van der Waals atomic separation. Magnetic susceptibility measurements show…
Common experience tells us that a knot significantly weakens the polymer strand in which it is tied, which in turn leads to more facile chain rupture under tensile loading. Using first-principles molecular dynamics calculations we describe the dynamical evolution of the radicals that form after chain rupture of a sing…
Zero-field muon spin relaxation (ZF-$μ$SR) data for dilute spin magnetic systems have been widely interpreted with what is called a Kubo-Toyabe form based on a Lorentzian distribution of local field components. We derive here the proper magnetic field \textit{magnitude} distribution using independent and uncorrelated…
We describe an experimental technique for the production of highly monodisperse emulsions (with minimum achievable polydispersities <3%). The phase to be dispersed is introduced into a coflowing, surfactant-laden continuous phase via a tapered capillary. Drops detach from the capillary when the streamwise forces excee…
To explore the relationship between local electromagnetic field enhancement and the large SERS (surface enhanced Raman scattering) enhancement that enables the observation of single molecule Raman spectra, we measure both resonant Rayleigh scattering spectra and rhodamine 6G Raman spectra from single Ag particles. Our…
MnBi/Al/MnBi thin films were prepared by using an electron-beam evaporation method then vacuum annealing. The effective magnetic anisotropy constant K eff of the MnBi/Al/MnBi thin film increases compared with MnBi thin film of similar magnetic thickness without an Al interlayer. This increase of K eff may be caused by…
Pure and chromium substituted barium ferrites BaFe 12- x Cr x O 19 (0 x 6.0) have been synthesised in air by self-propagating high-temperature synthesis (SHS): a combustion process involving a reaction of barium peroxide, iron oxide, chromium oxide and iron metal powder. Two series of SHS samples were produced: series…
Burkholderia sp. was grown on sucrose-containing mineral salts medium with phosphate limitation to induce poly(hydroxyalkanoate) (PHA) accumulation. Under these conditions the cultures accumulated 3-hydroxybutyric acid (3HB) and 3-hydroxy-4-pentenoic acid (3HPE) containing polyesters. Solvent fractionation of the puri…
A series of phosphorus(V), germanium(IV), and tin(IV) porphyrin-based, "axial-bonding"-type hybrid trimers have been readily constructed by employing a new "building-block" approach. The approach is modular in nature, and it involves simple "inorganic" reactions such as axial bond formation of main group element conta…
Two series of redox-active, iron−sulfur core dendrimers of the general structure (nBu 4 N) 2 [Fe 4 S 4 (S-Dend) 4 ] (Dend = dendrons of generations 1 through 4) were prepared. Heterogeneous electron-transfer rate constants indicated that the rigid series of dendrimers were more effective at attenuating the rate of ele…
Transport behavior of monovalent and divalent solutes across mesoporous Anopore γ-alumina membranes was investigated as a function of pore diameter, pH, ionic strength, and nature of the salt or complexing species in solution. Radiotracers 137 Cs, 85 Sr, 22 Na, and 45 Ca were present in the feed solutions at very low…
Reduction in the amount of ammonia in fuel gas from biomass gasification was studied. Experiments were carried out in a fixed-bed reactor at 200−1000 °C, 21 atm. A kinetic model for ammonia decomposition was developed. The partial pressure of hydrogen in the fuel gas was a key factor to model ammonia decomposition. Ac…
The phenanthroline adduct of the tris(2-thenoyltrifluoroaceto- O, O ‘)europium(III) complex, Eu(TTA) 3 phen, was doped into organically modified silicate (ORMOSIL) matrixes via the sol−gel process, and the luminescence properties of the resultant ORMOSIL composite phosphors (ORMOSIL:Eu(TTA) 3 phen) were characterized.…
The charge-ordering states with lattice distortions of a halogen-bridged binuclear-metal mixed-valence complex (called MMX chain), Pt 2 ( dta ) 4 I ( dta = CH 3 CS 2 - ), have been investigated by transport, magnetic, and optical measurements. This complex is a binuclear unit-assembled conductor containing metal−metal…
Using Monte Carlo simulations, we investigate the possibility of an orientational melting transition within a "rope" of (10,10) carbon nanotubes. When twisting nanotubes bundle up during the synthesis, orientational dislocations or twistons arise from the competition between the anisotropic inter-tube interactions, wh…
We discuss the effects of an applied magnetic field on the low energy excitations in the low temperature phase of Yb4As3. We show also why the magnetic interaction of the Yb{3+} ions is nearly of an isotropic Heisenberg spin-1/2 type. A small anisotropy due to an intrachain dipolar interaction leads to the opening of…
Uniform inorganic and hybrid inorganic−organic hollow microspheres have been produced by coating colloidal core templates with alternating layers of oppositely charged nanoparticles and polymer, and thereafter removing the core either by heating or chemical treatment. The multilayers were constructed by consecutively…
The order−disorder transition temperature ( T ODT ) of symmetric styrene−isoprene diblock copolymers (AB) and its hetero-four-arm star analog (A 2 B 2 ) was measured using dynamic mechanical spectroscopy and small-angle X-ray scattering (SAXS). Care was taken to ensure that the arm molecular weights of both AB and A 2…