Materials Literature
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Abstract Two different commercial crosslinked resins (Amberlite GT73 and Amberlite IRC748) were employed for anchoring silver. The SH and N(CH 2 COOH) 2 groups, respectively, present on these resins were used for Ag + chelation from an aqueous solution. The Ag + ions were reduced with three different reductants: hyd…
The heat of reaction is an important parameter in the safe, successful scale-up of chemical processes. Reaction heat data is used to calculate the potential adiabatic temperature rise of the desired reaction, providing a worst-case scenario for rapid reaction of the entire batch with no heat loss to the surroundings.…
We present molecular dynamics simulations of the structural relaxation of a simple bead–spring model for polymer blends. The introduction of a different monomer size induces a large timescale separation for the dynamics of the two components. Simulation results for a large set of observables probing density correlatio…
Supramolecular structures of porphyrin hetero-assemblies and the achiral analogous are determined through energy dispersive X-ray diffraction. In presence of phenylalanine, CuT4 cationic and H2TTPS anionic porphyrins yield a suprachiral α-helix persisting even after removing the chiral template. The analogous synthesi…
The combination of the two-dimensional layered structure and the semimetallic character of graphite is expected to produce a $\mathrm{C}\phantom{\rule{0.2em}{0ex}}1s$ photoemission spectrum of the (0001) surface with only one highly symmetric component. This simple view has been challenged by a recent study, performed…
Quantum dots can be charged selectively by electrons or holes. This leads to changes in the intensity of interband and intraband optical transitions. Using atomistic pseudopotential calculations, we show that (i) when carriers are injected into dot-interior quantum-confined states, the intensity of interband transitio…
Two-dimensional ZnO nanostructures have been prepared with nanoparticles as building blocks either by a solvothermal method or a liquid transport process at room temperature. ZnO nanoparticles can agglomerate into particulate nanosheets with area size in the micrometer range by directly heating in n -hexane. A stack o…
Abstract Carbon nanofibers (CNF) were modified via plasma assisted polymerization in a specially designed reactor. The effect of the plasma reactor conditions, such as power and time, on the extent of the CNFs modification was examined. Polystyrene (PS) coated nanofibers plus PS polymer were then processed in a Braben…
Lithium tetraborate (Li 2 B 4 O 7 ) crystals were grown by the Czochralski technique. The thermal gradient is the key factor to grow crack-free crystals. We have optimized the vertical thermal gradient for the growth of crack-free and optical quality crystals. This crystals belongs to the tetragonal system with lattic…
Using the static analytical method, the solubility of 1,2,4-benzenetricarboxylic acid in binary acetic acid + water solvent mixtures has been measured. The experimental temperatures range from (313.2 to 363.2) K, and the mole fractions of acetic acid in the solvent mixtures range from 0.416 to 1.000. The experimental…
We have measured the yields $\ensuremath{\gamma}$ of the secondary electrons emitted from MgO, BaO, and $\mathrm{Si}{\mathrm{O}}_{2}$ surfaces by impact of slow noble gas ions and identified the apparent threshold ion energies $({E}_{0})$ of kinetic electron emission from the discontinuity points in the $\ensuremath{\…
A combined experimental and theoretical study of the energy loss of protons in fluorides is presented. The measurements were performed in fresh $\mathrm{Al}{\mathrm{F}}_{3}$ evaporated in situ on self-supported C foils, extending the low-energy range from 25 down to $0.7\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$. The tr…
Abstract A novel ultraviolet (UV) absorber, 5,5′‐disulfide‐bis[2‐(2‐hydroxy‐3,5‐di‐ tert ‐butylphenyl)‐2Hbenzotriazole] (DSBHTBB) was synthesized. Its structure was characterized by FTIR, NMR, UV, FABMS, and elemental analysis. In comparison with the common commercial benzotriazole UV absorbers, the absorption maximum…
Intertube conductance of double-wall carbon nanotubes with impurities is numerically studied. Its length dependence for various impurities is scaled by a mean free path. The intertube conductance exhibits drastic linear increase with the tube length and takes a maximum around at the localization length. The maximum co…
We consider an off-lattice liquid crystal pair potential in strictly two dimensions. The potential is purely repulsive and short ranged. Nevertheless, by means of a single parameter in the potential, the system is shown to undergo a first-order phase transition. The transition is studied using mean-field density funct…
A novel switching property of conducting polymer nanowires is observed. The change in resistance was found to be more than three orders of magnitude (see figure) and the threshold voltage (current) can be tuned by playing with the diameter and/or temperature. The switching mechanism observed in this structurally disor…
We have reported previously that the calcium-depleted form of bovine alpha-lactalbumin (apo alpha-LA) interacts with hen egg-white lysozyme (LYS) to form spherical supramolecular structures. These supramolecular structures contain an equimolar ratio of the two proteins. We further explore here the organization of thes…
Pd over TiO 2 (sol−gel and Hombikat uv-100) slurries with and without binders have been deposited on square-channel cordierite honeycombs, and vibration, heat, and abrasion resistance of washcoated minimonoliths have been evaluated. Activity tests were carried out in a microreactor operated at differential conditions.…
Our recent theory for the glassy dynamics of fluids and suspensions of hard nonspherical objects is applied to several modestly anisotropic shapes. The role of bond length and aspect ratio is studied for diatomics, triatomics, and spherocylinders. As spherical symmetry is broken the ideal kinetic glass transition volu…
A new approach to the deposition of Mn12 single-molecule magnet monolayers on the functionalized Au(111) surface optimized for the investigation by means of scanning tunneling spectroscopy was developed. To demonstrate this method, the new Mn12 complex [Mn12O12(O2CC6H4F)16(EtOH)4].4.4CHCl3 was synthesized and characte…