Materials Literature
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We investigated the transformation of ultrathin continuous amorphous Ge layers embedded in ${\text{SiO}}_{2}$ into isolated nanocrystals during thermal annealing. The dependence of the cluster self-organization processes on annealing time, annealing temperature, and initial layer thickness was studied quantitatively b…
The evolution of the crystal structure of rhombohedral PrAlO(3) perovskite with pressure has been investigated by single-crystal x-ray diffraction and Raman scattering experiments. The structural evolution as indicated by lattice strains, octahedral tilts, and the distortions of the octahedral AlO(6) and polyhedral Pr…
The system (1−x)PbTiO3-(x)BiAlO3 has been investigated with regard to its solid solubility, crystal structure, microstructure, and ferroelectric transition. The unit cell volume and the tetragonality exhibit anomalous behavior near x=0.10. The Curie point (TC) of PbTiO3 was however found to be nearly unchanged. The st…
The effect of different preparation processes (impregnation and agglomeration) on the performance and properties of PtSnNa/ZSM-5 catalyst for propane dehydrogenation was studied. Some methods such as BET surface area measurement, catalyst particle mechanical strength, temperature-programmed desoption of ammonia (TPDA)…
A recently proposed approach for extracting band structures from finite-cluster calculations is improved so that (avoided) band crossings can be handled and the problems related to so-called doublings and holes are reduced. In particular, we demonstrate how the method can be combined with the elongation method for the…
Polypeptide helices possess considerable intrinsic dipole moments oriented along their axes. While for proline helices the dipoles originate solely from the ordered orientation of the amide bonds, for 3(10-) and alpha-helices the polarization resultant from the formation of hydrogen-bond network further increases the…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation V. Jayalakshmi, S. Krishna Prasad; Understanding the observation of large electrical conductivity…
Herein, we investigate the chemisorption of hydrogen on double wall carbon nanotubes (DWCNT) employing density functional theory and periodic boundary conditions. In agreement with recent investigations based on Lennard-Jones potentials, we found that the (n,m)@(n+9,m) combination is favored for tubes with small diame…
Interpolyelectrolyte complex (IPEC) nanoparticles formed between chitosan having different molar masses (470, 670, and 780 kDa) and two random copolymers of 2-(acrylamido)-2-methylpropanesulfonate (AMPS) with tert-butylacrylamide (TBA) [P(AMPS(54)-co-TBA(46)) and P(AMPS(37)-co-TBA(63))] were prepared by the dropwise a…
Abstract Austenitic chromium–manganese–nitrogen stabilized stainless steels have been developed to replace chromium–nickel–nitrogen stainless steels in certain applications. In comparison, chromium–manganese–nitrogen steels have improved mechanical properties and acceptable corrosion resistance in hot, high chloride c…
The solubilities of chloroquine diphosphate and 4,7-dichloroquinoline in water, ethanol, tetrahydrofuran, acetone, and acetonitrile were measured over the temperature range of (298.2 to 333.2) K. The solubilities of both analytes in different solvents increase smoothly with temperature. On the basis of the solubility…
Superconductivity in LaNiPO is disrupted by small $(\ensuremath{\sim}5%)$ amounts of nonstoichiometry on the lanthanum site, even though the electronic contribution to the heat capacity increases with increasing nonstoichiometry. All samples also exhibit specific-heat anomalies consistent with the presence of ferromag…
Abstract In this study, a novel flow‐based method is presented to place catalytic nanoparticles into a reactor by sol‐gelation of a porous ceramic consisting of Rh/ceria/zirconia nanoparticles, silica sand, ceramic binder, and a gelation agent. This method allows for the placement of a liquid precursor containing the…
Synchrotron X-ray, neutron powder diffraction, magnetic susceptibility, and electrical resistance measurements were used to investigate the Nd 1− x Ca x FeAsO series. The solubility of calcium is limited to 0 ≤ x ≤ 0.05. Within this interval, the iron arsenide layer contracts linearly in agreement with the hole doping…
Reciprocal space mapping (RSM) of the relaxor ferroelectric 0.91Pb(Zn1/3Nb2/3)O3−0.09PbTiO3 (PZN-9%PT) single crystals has been performed by using high-resolution synchrotron x-ray diffraction as a function of temperature. The PZN–9%PT crystal consists of tetragonal micro/nanotwin domains and undergoes a sequence of r…
Abstract The inhibiting effect of 1‐methyl‐3‐pyridine‐2‐yl‐thiourea (MPT) on the corrosion of stainless steel in 0.5 M H 2 SO 4 solution was investigated using weight loss and potentiostatic polarization techniques. The percentage inhibition efficiencies and surface coverage degrees increased with increasing additive…
An efficient synthesizing procedure of photoluminescent silicon nanocrystals is demonstrated by means of ultrasound assisted electrochemical octyltrichlorosilane reduction that produces octane terminated Si nanocrystals in a single step. The described procedure allows one to make Si nanocrystals with alkyl surface ter…
High-resolution low-frequency Raman scattering measurements from embedded AgAu nanoparticles unveil efficient scattering by harmonics of both the quadrupolar and the spherical modes. Comparing the experimental data with theoretical calculations that account for both the embedding medium and the resonant Raman process…
Abstract Using conventional methods to synthesize magnetic nanoparticles (NPs) with uniform size is a challenging task. Moreover, the degradation of magnetic NPs is an obstacle to practical applications. The fabrication of silica‐shielded magnetite NPs on carbon nitride nanotubes (CNNTs) provides a possible route to o…
Deposition of submonolayer coverages of 3,4,9,10-perylenetetracarboxylic diimide onto NaCl(001) results in the bimodal growth of coexisting square and needle-shaped islands. The epitaxy of each island type was determined from molecular and atomic resolution noncontact atomic force microscopy images. Postdeposition, th…