Materials Literature
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The molecular mobility of amorphous ibuprofen has been investigated by broadband dielectric relaxation spectroscopy (DRS) covering a temperature range of more than 200 K. Four different relaxation processes, labeled as alpha, beta, gamma, and D, were detected and characterized, and a complete relaxation map was given…
A simple solvothermal method has been discovered to synthesize single-walled flux-closure Ni-Co magnetic alloy nanorings in high yield, which are directly fabricated in a reaction solution and able to chronically exist in solution.
We have investigated epitaxial graphene films grown on SiC(0001) by annealing in an atmosphere of Ar instead of vacuum. Using AFM and LEEM we observe a significantly improved surface morphology and graphene domain size. Hall measurements on monolayer graphene films show a carrier mobility of around 1000 cm^2/Vs at roo…
We consider the influence of the built-in surface field on the 180-degree domain wall profile in primary ferroics within Landau-Ginsburg-Devonshire phenomenological approach. We predict the effect of domain wall bending near the surface caused by the built-in field and derived corresponding approximate analytical expr…
In this paper we investigated the most important family of proton conducting oxides, i.e. cerates, by means of pair distribution function analysis (PDF) obtained from total neutron scattering data. The results clearly demonstrates that the local structure plays a fundamental role in the protonation process. Oxygen vac…
We introduce the construction of a orthogonal wavepacket basis set, using the concept of stroboscopic time propagation, tailored to the efficient description of non-equilibrium extended electronic systems. Thanks to three desirable properties of this basis, significant insight is provided into non-equilibrium processe…
We report on a controlled synthesis of two novel semiconducting heterostructures: heterocrystalline-ZnS/single-crystalline-ZnO biaxial nanobelts and side-to-side single-crystalline ZnS/ZnO biaxial nanobelts via a simple one-step thermal evaporation method. In the first heterostructure, a ZnS domain is composed of the…
We report the near-edge x-ray absorption fine-structure (NEXAFS) spectrum of a single layer of graphite (graphene) obtained by micromechanical cleavage of highly ordered pyrolytic graphite on a SiO2 substrate. We utilized a photoemission electron microscope to separately study single-, double-, and few-layers graphene…
Conjugation of proteins to nanoparticles has numerous applications in sensing, imaging, delivery, catalysis, therapy and control of protein structure and activity. Therefore, characterizing the nanoparticle-protein interface is of great importance. A variety of covalent and non-covalent linking chemistries have been r…
InP/ZnS core/shell nanocrystals are prepared using a single-step heating-up method relying on the difference in reactivity of the applied InP and ZnS precursors. The obtained particles exhibit size-dependent emission in the range of 480-590 nm, a fluorescence quantum yield of 50-70%, and high photostability.
Electrospinning has emerged to be a simple, elegant and scalable technique to fabricate polymeric nanofibers. Pure polymers as well as blends and composites of both natural and synthetics have been successfully electrospun into nanofiber matrices. Physiochemical properties of nanofiber matrices can be controlled by ma…
Polymer matrix nanocomposites have attracted growing attention due to the potential for significantly improving the properties of the polymer by adding a very small amount of nanoparticles. However, the improvement in properties has been related to the degree of dispersion of the nanoparticles in the polymer matrix an…
Abstract Semirigid and plasticized poly(vinyl chloride) (PVC) samples, stabilized with epoxidized sunflower oil (ESO), Zn, and Ca stearates, were exposed in Algiers (hot, Mediterranean climate) for 12 months in three sites where the concentrations of atmospheric pollutants (NO x , O 3 , hydrocarbons) are known. The ev…
Abstract This article is devoted to the elaboration of a nonempirical kinetic model for the thermal oxidation of molten unstabilized polypropylene (PP), which occurs typically at 170–250°C, a current temperature range for PP processing. The validity of the kinetic model has been successfully checked with the kinetic c…
Abstract Blends of flexible poly(vinyl chloride) (PVC) and a poly(hydroxybutyrate valerate) (PHBV) copolymer were prepared and characterized with different techniques. The tensile strength of PVC did not show a marked reduction at PHBV concentrations up to 50 phr, despite a lack of miscibility between the two polymers…
ABS nanocomposites were prepared in this study by using an indirect method. The method involved the preparation of SAN nanocomposites and subsequent addition of gABS as the second constituent of ABS. For this purpose, in the first step, SAN/clay nanocomposites were prepared containing different loading levels of montm…
Two Al 2 O 3 –TiB 2 composite coatings were deposited by axial plasma spray using two types of feedstocks. One of the feedstocks was a conventional micrometre sized Al 2 O 3 –30 wt-%TiB 2 composite powder from a self-propagating high temperature synthesis (SHS) process. The second was fabricated by spray drying SHSed…
We report the effect of solvent isotopic replacement on the structure evolution of gold nanorods synthesized in aqueous solution using the Ag(I)-mediated seeded-growth method (see Nikoobakht, B.; El-Sayed, M. A. Chem. Mater. 2003, 15, 1957). With increasing replacement of water by deuterium oxide, both higher yields a…
Generally, the first step in modeling molecular magnets involves obtaining the low-lying eigenstates of a Heisenberg exchange Hamiltonian which conserves total spin and belongs usually to a non-Abelian point group. In quantum chemistry, it has been a long-standing problem to target a state which has definite total spi…
In contrast with the multiple twinning and/or domain formation found in the mica-like polymorphs of CaTe(2)O(5), calcium pentaoxidoditellurate(IV), that have been prepared by solid-state reactions and for which complete structure determinations have not been successful up to now, the crystal structure of a hydrotherma…