Materials Literature
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The effect of doping a commercial alumina support with metal oxides of Ce, Co, Cu, Fe, La, Mg, Mn, Ni and Zn was investigated. Doped δ-Al2O3 samples were obtained by simple physical mixture (PM) of the alumina with the desired commercial oxide and by traditional impregnation of alumina with precursor salts of the same…
We report on mechanisms for suppressing diamond secondary nucleation in microwave plasma self-bias-enhanced growth (SBEG) of diamond films in methane diluted by argon. High-density plasma at a small distance from the substrate induces a floating potential which promotes high-flux, low-energy ion bombardment on diamond…
The effect of carbon nanofibers on the crystallization of polyethylene using differential scanning calorimetry operating in dynamical mode at various cooling rates (2, 4, 8, 15, and 30°C/min) is reported. Experimental data were analyzed using the Avrami, Ozawa, and the combined Avrami–Ozawa methods. It is concluded th…
A composite film containing photochromic spiropyran dye 1 and BaFCl:Eu was developed for X‐ray dose measurement at a level of a few dozen gray (Gy). The reflectance intensity at selected wavelength, obtained from X‐radiation, can be satisfactorily related to the absorbed dose in the range of 0−30 Gy. The composite fil…
We report here a thorough (1)H NMR study of Fe(acac)(2) solutions in a wide variety of noncoordinating and coordinating solvents, as well as the interaction of this complex with Et(3)N, pyridine, PMe(2)Ph, and R(2)PCH(2)CH(2)PR(2) [R = Ph (dppe), Et (depe)] in C(6)D(6). The study reveals that Fe(acac)(2) is readily tr…
First-principles calculations are implemented to investigate the electronic and magnetic properties of transition-metal (TM)-atom-embedded graphanes. We find that most of the configurations possess magnetic ground states that have larger magnetic moments compared to embedding TM atoms in graphenes. Furthermore, the va…
The electronic structure of bulk wurtzite ZnO is investigated in valence electron energy loss spectroscopy with scanning transmission electron microscopy. To qualitatively interpret the characteristic spectral feature of ZnO, the complex dielectric function of ZnO is derived from the corresponding low-loss spectra. By…
The Seebeck coefficient, a key parameter describing a material's thermoelectric performance, is generally difficult to measure, and no intrinsic calibration standard exists. Quantum dots and single electron tunneling devices with sharp transmission resonances spaced by many kT have a material-independent Seebeck coeff…
Abstract The relevance of the structure of ILs for the dissolution and microwave‐assisted acylation of eucalyptus cellulose is reported. The 1‐R‐3‐methylimizadolium‐X ILs with X = Cl, Ac and R = 1‐butyl, 2‐methoxyethyl, 1‐heptyl, and 3,6‐dioxa‐(1‐heptyl) are studied: C 4 MeImX, C 3 OMeImX, C 7 MeImX, and C 5 O 2 MeImX…
Using X-ray absorption spectroscopy (XAS), we studied the local structure in LaMnO 3 under applied pressure across and well above the insulator-to-metal (IM) transition. A hysteretic behavior points to the coexistence of two phases within a large pressure range (7 to 25 GPa). The ambient phase with highly Jahn-Teller…
Three-dimensional (3D) thorny plasmonic gold nanostructures were synthesized by adding Ag nanospheres to the reaction systems containing HAuCl 4 and NH 2 OH at room temperature. The redox displacement between silver seeds and HAuCl 4 first yielded gold nanoseeds, and the simultaneously formed byproduct AgCl precipitat…
Abstract A series of functional polyhedral oligomeric silsesquioxane (POSS)/polyimide (PI) nanocomposites were prepared using a two‐step approach. First, octa(aminophenyl)silsesquioxane (OAPS) was mixed with poly(amic acid) (PAA) prepared by reacting bis(4‐amino‐3,5‐dimethylphenyl)‐3‐quinolylmethane and 3,3′,4,4′‐benz…
The mechanical and fatigue behavior of neat poly(lactic acid) (PLA) films and PLA films reinforced with 5 wt% nanoclay particles has been examined using various analytical procedures. The results showed that for the films tested in this study, PLA-5 wt% samples were more susceptible to crazing at the same maximum fati…
Abstract The dispersion of three kinds of acid‐treated carbon nanotubes (CNTs) in poly(acrylic acid) (PAA) aqueous solution of different pH and ionic strengths (varied by NaCl, KCl and ZnCl 2 ) was investigated by visual observation, zeta potential, particle size analysis, transmission electron microscopy and scanning…
Metastable κ-Al2O3 was produced by thermal treatment of γ-Al2O3 and then Ni catalysts were prepared on both κ-Al2O3 and γ-Al2O3. Catalysts containing both low (5 wt.%) and high (20 wt.%) amounts of Ni were tested for activity towards toluene hydrogenation and characterized with X-ray diffraction, temperature-programme…
A graphene wireless sensor concept is described. By utilizing thin gate dielectrics, the capacitance in a metal-insulator-graphene structure varies with charge concentration through the quantum capacitance effect. Simulations using realistic structural and transport parameters predict quality factors, Q, >60 at…
Abstract The response of synthesized shape memory segmented polyurethanes (PUs) was affected by the addition of cellulose nanocrystals, as well as by the various conditions selected to carry out thermomechanical cyclic tests. The PUs were synthesized from an α‐hydro‐ω‐hydroxy‐poly(ethylene oxide), tolylene‐2,4‐diisocy…
Using event-driven molecular dynamics simulations, we quantify how the self diffusivity of confined hard-sphere fluids depends on the nature of the confining boundaries. We explore systems with featureless confining boundaries that treat particle-boundary collisions in different ways and also various types of physical…
The standard way to find the orbital occupation of Jahn-Teller (JT) ions is to use structural data, with the assumption of a one-to-one correspondence between the orbital occupation and the associated JT distortion, e.g., in O${}_{6}$ octahedron. We show, however, that this approach can be incorrect, e.g., for layered…
This work characterizes the adsorption, structure, and binding mechanism of oxygenated organic species from cyclohexane solution at the liquid/solid interface of optically flat alumina-supported palladium nanoparticle surfaces prepared by atomic layer deposition (ALD). The surface-specific nonlinear optical vibrationa…