Materials Literature
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Lanthanum hexaboride(LaB 6 ) films have been deposited on silicon tip field emitters by electron-beam evaporation. The field emission characteristics are studied in a diode test cell in a vacuum system. The experimental results show that the field emission stability of the LaB 6 -coated Si-tip FEA can be improved and…
β-Zn 4 Sb 3 is a promising thermoelectric material for energy conversion applications due to its exceptional low thermal conductivity. In this report, the effect of In substitution on thermoelectric properties and β to α/α' phase transition of indium doped compounds (Zn 1− x In x ) 4 Sb 3 ( x = 0–0.02) were investigat…
We report a detailed study of the magnetophotoluminescence of single-wall carbon nanotubes at various temperatures in fields up to $58\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. We give direct experimental evidence of the diameter dependence of the Aharanov-Bohm phase-induced band gap shifts. Large increases in intensity…
The potential energy profiles for the Fe+- and Mn+-assisted reduction of N2O by CO were studied at the B3LYP density functional level in order to get the differences in the reaction mechanisms determining the efficiency of iron and the inactivity of manganese as ionic catalysts. Both ground and excited states of catio…
Abstract Five 1,1,3‐trisubstituted naphtho[2,3‐ c ]pyran‐5,10‐dione derivatives were designed and synthesized in five steps from 2‐acetyl‐1,3‐indandione. Prepared quinones 6a – e instantly changed from either red or blue to yellow or orange red, when treated with sodium borohydride in methanol. The resulting reduced h…
Structural and surface morphology studies of MnF2 epitaxial layers have been performed by x-ray diffraction and atomic force microscopy (AFM). MnF2 layers of different thicknesses (0.12–1.25 µm) were grown by MBE on Si(0 0 1) substrates with the deposited CaF2-buffer layer having a 1 1 0 orientation and a grooved and…
The orientation growth and angle-dependent photoluminescence (PL) of nitrogen-doped SnO2 films grown on Si substrate by reactive magnetron sputtering have been studied. It was found that the orientation of the nitrogen-doped SnO2 films depends strongly on their thickness, and a highly [1 1 0]-oriented film was achieve…
In this article, a salted sol-gel and a salted sol-gel combustion method were developed for nanophosphor synthesis. Massive nanophosphor production becomes possible by using these novel methods. Some blue, green, and red LED nanophosphors were prepared by using these novel methods. Morphology, growth mechanism, and lu…
Abstract A novel preparation method for the core‐shell type biodegradable polyesters or biodegradable materials grafted with biodegradable polyesters was developed by alkaline surface treatment of biodegradable polyester films and subsequent enzymatic polymerization of aliphatic lactones, one example of which is shown…
(Ca 1− x ,Zn x )TiO 3 :Pr, B red phosphor particles were prepared using the peroxide‐based route and their photoluminescent (PL) properties were investigated by changing the sintering temperature, the concentration of the activator, the ratio of Ca to Zn, and the amount of H 3 BO 3 flux. For the CaTiO 3 :Pr phosphor,…
The complex dendrimeric contrast agent Gadomer has been comprehensively characterized using various mass spectrometric techniques in combination with capillary electrophoresis. The analytical challenges arising from the structure of this analyte, e.g., the presence of a complex isotopic pattern originating from multip…
This work presents the hydrothermal synthesis and photoluminescence (PL) properties of La 2− x Eu x Sn 2 O 7 ( x =0–2.0) nanocrystals. The complex stannates with different La/Eu ratios ranging between La 2 Sn 2 O 7 and Eu 2 Sn 2 O 7 have been synthesized and characterized with respect to crystal structure, particle si…
A review is given on the studies of microscopic magnetic properties and macroscopic dielectric properties as functions of temperature, magnetic field, and the variety of R 3 + (R = rare-earth, Bi, and Y) ions in the multiferroic RMn 2 O 5 compounds by neutron diffraction and dielectric measurements. We have observed s…
Langmuir-Blodgett (LB) films are well known structures prepared as a result of successive transfer of monolayers (ML) from the gas-liquid interface onto solid substrates. One impressive possibility of LB method is the opportunity to vary the thickness of the film to an accuracy of one transfer, which could coincide wi…
Abstract Multilayer films were assembled from a strong polyelectrolyte (poly(diallyldimethylammonium chloride), PDADMAC) and a copolymer containing both strongly charged styrene sulfonate moieties and weakly charged maleic acid moieties (poly(4‐styrenesulfonic acid‐ co ‐maleic acid), PSSMA). Growth of PSSMA/PDADMAC mu…
Abstract A generalized variational formulation, including quasi‐convexification of energy wells for arbitrarily many martensitic variants in case of mono‐crystals for linearized strains, was developed by Govindjee and Miehe ( Comp. Meth. Appl. Mech. Eng. 2001; 191 (3–5):215–238) and computationally extended by Stein a…
When a heteroepitaxial film is grown on a vicinal substrate, the terrace steps at the growth front may bunch together to relieve strain, resulting in a rough surface. On the other hand, proper manipulation of the growth kinetics may suppress the inherent bunching instability, thus preserving step-flow growth. Here we…
Abstract Three series of aromatic polyamides, polyesters, and poly(1,3,4‐oxadiazole)s containing bulky fluorene structures were prepared from 9,9‐bis(4‐carboxyphenyl) fluorene. All of the polymers were readily soluble in many organic solvents and showed useful thermal stability associated with high glass‐transition te…
Magnetoelectric (ME) composite ceramics of NiFe 2 O 4 (NFO) and lead zirconate titanate (PZT) were synthesized by a simple in situ processing based on a sol–gel method followed by a conventional sintering. X-ray diffraction patterns and scanning electron microscopy images revealed that this processing can produce two…
Nanoparticle coprecipitates of lanthanum hydroxide and nickel hydroxide were synthesized in a continuous hydrothermal flow synthesis system. Two such coprecipitates with the appropriate La:Ni molar ratios were subsequently directly converted to phase-pure La4Ni3O10 and La3Ni2O7, respectively, via a single heat-treatme…