Materials Literature
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We report pyroelectric current measurements on 150 nm thick PbZr0.2Ti0.8O3 (PZT) epitaxial films using frequency-domain thermal measurements over the range 0.02 Hz–1.3 MHz. The measured pyroelectric currents are proportional to the rate of temperature change, from ∼10−5 A/m2 to ∼103 A/m2 over the range 10−2 to 106 K/s…
Technetium is intimately linked with nuclear reactions. The ultraminute natural levels in the environment are due to the spontaneous fission of uranium isotopes. The discovery of technetium was born from accelerator reactions, and its use and presence in the modern world are directly due to nuclear reactors. While occ…
Light-matter interactions are of tremendous importance in a wide range of fields from solar energy conversion to photonics. Here the optical dispersion behavior of undoped and 20 mol. % Sm doped ceria thin films, both dense and porous, were evaluated by UV-Vis optical transmission measurements, with the objective of d…
Abstract 1,3‐Dimethyldisiloxane, O(SiH 2 Me) 2 , diethyl ether, OEt 2 , and their metal complexes (Li + ,Ag + ) have been used as model systems to uncover the reasons underlying the lower Lewis basicity of siloxanes compared to analogous ethers. Bonding in the metal complexes has been analyzed with quantum theory of a…
We observe that an Au interlayer markedly enhances the electrical field emission (EFE) properties of ultrananocrystalline diamond (UNCD) films on Si substrates. The EFE properties of UNCD/Au/Si films can be turned on at a lower field and attain a higher current density than in UNCD films grown on Si substrates without…
Abstract Various elastomeric polypropylenes (PPs) are synthesized through homogeneous propylene polymerization with metallocene catalyst (2‐PhInd) 2 ZrCl 2 in the presence of different cocatalyst mixtures: triethylaluminum (TEA)/methylaluminoxane (MAO) or triisobutylaluminum (TIBA)/MAO in the range of Al AlR3 /Al MAO…
The recent development of X-ray free-electron laser sources has created new opportunities for the structural analysis of protein nanocrystals. The extremely small sizes of the crystals, as well as imperfections of the crystal structure, result in an interference phenomenon in the diffraction pattern. With decreasing c…
We report the fabrication technique and optical properties of multilayered two-dimensional (2D) gold nanoparticle sheets ("Au nanosheet"). The 2D crystalline monolayer sheet composed of Au nanoparticles shows an absorption peak originating from a localized surface plasmon resonance (LSPR). It was found that the absorp…
Refrigeration by an active magnetic regenerative system (AMR) is potentially more attractive, as compared to conventional techniques. Indeed, devices based upon an AMR cycle are more efficient, compact, environment-friendly and can operate over a broad range of temperatures. In this paper, attention is focused to the…
The current study reports the fabrication and characterization of superhydrophobic surfaces with increasing nanoroughness by decreasing silica nanoparticle size in a sol–gel matrix. Using small-angle X-ray scattering (SAXS) measurements allowed for the direct quantification of air entrapped at the interface, revealing…
The mesomorphic, thermoptic and glass-forming properties of 4-[6-((cholesteryloxy) carbonyl)oxy hexyloxy] benzoic acid (Ch-BA) have been investigated as a novel supramolecular hydrogen-bonded cholesteric mesogen. Fourier transform infrared and 1H nuclear magnetic resonance studies have confirmed the chemical structure…
The chemical diffusion coefficient (Dchem) of epitaxial LSC thin films was measured by a newly designed conductivity relaxation method. Dchem of epitaxial thin films was found to be higher than that of bulk LSC by up to two orders of magnitude, and was found to be enhanced further as the film became thinner.
High-Contrast Gratings (HCG) are modeled in a rigorous way by a new mode-matching approach. They are highly attractive because they have recently proved suitable to replace distributed Bragg mirrors in Vertical-Cavity Surface-Emitting Lasers (VCSELs). Through a change of basis from plane to cylindrical waves, the gene…
In this study, we examined the low substrate temperature (Ts) growth mechanism of Ag thin films in the atomic shadowing regime (Ts ≪ melting point Tm). The Ag thin films were deposited using glancing angle deposition (GLAD) at different substrate temperatures varying from 320 K to 100 K. Interestingly, it is observed…
We have synthesized polycrystalline RRhSn (R = Tb-Tm) compounds, which crystallize in the hexagonal structure with space group P6¯2m. All the compounds, except HoRhSn, are antiferromagnetic at low temperatures. TbRhSn and DyRhSn show multiple magnetic transitions and metamagnetic behavior. Heat capacity and electrical…
Abstract We report a highly efficient approach to prepare dendrimers by taking advantage of the orthogonal characteristic of aza‐Michael addition and thiol‐yne reactions. A fifth generation dendrimer was synthesized within five steps without protection/activation procedures. The reactions proceed under benign conditio…
An antioxidant intercalated layered double hydroxide (A.O-LDH) nanohybrid system constructed using host–guest chemistry and employed as multifunctional nanofiller to fabricate highly durable polymer composites, namely polypropylene (PP) nanocomposites. The intercalated antioxidants efficiently prolonged the degradatio…
We report the effect of strontium (Sr) doping on dielectric, magnetization, and thermodynamic properties of polycrystalline Y1−xSrxMnO3 (x = 0.1, 0.2) samples prepared by conventional solid-state reaction method. The temperature dependent dielectric permittivity and specific heat curves noticeably show the anomalies n…
The effects of alloying elements on the kinetics of austenitization from pearlite structure were studied by computer simulation in Fe–C–M ternary alloys, where M is Mn, Cr, Si or Ni, assuming local equilibrium conditions at all transformation interfaces. A thin austenite film was assumed to nucleate at ferrite/cementi…
Amorphous carbon nanotubes (ACNTs) were synthesized by following a simple chemical route with ammonium chloride and ferrocene taken as starting materials and heating at 250 °C under an open atmosphere. The as-prepared samples were oxidized and chemically activated by simple acid treatment and further functionalized by…