Materials Literature
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We study the kinetic pathways for the isotropic-to-nematic transition in a fluid of colloidal hard rods. In order to follow the formation of the nematic phase, we develop a new cluster criterion that distinguishes nematic clusters from the isotropic phase. Applying this criterion in Monte Carlo simulations, we find sp…
The n-alkanes C(16)H(34), C(17)H(36), C(19)H(40), and C(25)H(52) have been imbibed and solidified in mesoporous, crystalline silicon with a mean pore diameter of 10 nm. The structures and phase sequences have been determined by x-ray diffractometry. Apart from a reduction and the hysteresis of the melting-freezing tra…
Abstract One of the suitable methods for removing heavy metals from waste water is using surface adsorption process. In this article, the preparation of polyaniline and its composites as adsorbents are discussed and the capability of separating chromium from industrial waste water is studied. The results were compared…
Multilayered Ba1−xSrxTiO3 (BST) films were deposited on Pt coated Si substrates via metalorganic solution deposition. The multilayer heterostructures consisted of three distinct layers of ∼220nm nominal thickness with compositions corresponding to BST 63∕37, BST 78∕22, and BST 88∕12. At room temperature, the heterostr…
In the last twenty five years structure determination from powder diffraction has evolved from a complex, time-consuming method to one easily usable. While the use of direct methods is restricted to samples well crystallized (sharp peaks, high resolution diffraction), structure solution using global optimization in di…
Difunktionelle Nanokomposite aus halbleitenden und magnetischen Nanopartikeln interessieren in biologischen Anwendungen zum Markieren, zur Bildgebung und zum Trennen von Zellen. Deshalb wurde ein Nanokompositsystem aus magnetischen Fe2O3-Nanopartikeln und CdSe-Quantenpunkten, das Superparamagnetismus mit einstellbaren…
Abstract A silver/nylon 6,6 nanocomposite containing 1 wt % metallic silver has been produced from an aqueous solution of silver nitrate in the presence of ammonia and ethylene glycol by an ultrasound‐assisted reduction method. The structure and properties of nylon 6,6 coated with silver have been characterized with X…
Crystal structure, spin state, and semiconductor-metal transitions of ${\mathrm{LaCoO}}_{3}$ in the $10--905\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ temperature range were studied by neutron diffraction at high pressures up to $4.5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and x-ray diffraction and Raman spectroscopy at h…
Violet-blue photoluminescence was produced at room temperature in a structurally disordered SrZrO3 perovskite structure with a 350.7nm excitation line. The intensity of this emission was higher than that of any other perovskites previously studied. The authors discuss the role of structural order-disorder that favors…
Abstract This work has been mainly focused on the development and optimization of the processing methodology to produce epoxy modified phenolic foams. This study analyzes the relation between the composition and the structure as well as the mechanical and flammability performance of epoxy‐phenolic (E‐P)‐based foams. P…
The current paper presents results from a laboratory experimental study on the resistance of concrete to simulated impact loading of fragments. The impact of fragments was simulated by the impact of ogive-nosed projectiles with a diameter of 12·6 mm and a mass of 15 g travelling at velocities from ∼610 to 710 m/s. The…
A magnetic vortex is a curling magnetic structure realized in a ferromagnetic disk, which is a promising candidate of a memory cell for future nonvolatile data storage devices. Thus, understanding of the stability and dynamical behaviour of the magnetic vortex is a major requirement for developing magnetic data storag…
We analyze theoretically and experimentally the electronic structure and charging diagram of three coupled lateral quantum dots filled with electrons. Using the Hubbard model and real-space exact diagonalization techniques we show that the electronic properties of this artificial molecule can be understood using a set…
An inelastic neutron scattering study of the lattice dynamics of the martensite phase of the ferromagnetic shape memory alloy, Ni 2 MnGa, reveals the presence of well-defined phasons associated with the charge density wave (CDW) resulting from Fermi surface (FS) nesting. The velocity and the temperature dependence of…
Abstract Multiwalled carbon nanotube/polycaprolactone nanocomposites (MWNT/PCL) were prepared by in situ polymerization, whereby as‐received MWNTs (P‐MWNTs) and purified MWNTs (A‐MWNTs) were used as reinforcing materials. The A‐MWNTs were purified by nitric acid treatment, which introduced the carboxyl groups (COOH) o…
The determination of enzyme activities and the screening of enzyme regulators is a major task in clinical chemistry and drug development. A broad variety of enzymatic reactions is associated with the consumption of adenosine triphosphate (ATP), including, in particular, phosphorylation reactions catalyzed by kinases,…
The superposition of the quantum rotational motion (tunneling) of the encapsulated Sc2C2 complex with the classical rotational motion of the surrounding C84 molecule in a powder crystal of Sc2C2@C84 fullerite is investigated by theory. Since the quantum rotor is dragged along by the C84 molecule, any detection method…
The authors report a significant enhancement in the thermal conductivity of a conventional carbon fiber/phenolic resin composite system when adding highly crystalline multiwalled carbon nanotubes. They demonstrate that 7wt% of carbon nanotubes dispersed homogeneously in a phenolic resin acted as an effective thermal b…
Using high-resolution neutron powder diffraction we have determined the average and local structure of YCrO 3 in order to explain the recently reported properties of YCrO 3 . Unlike conventional ferroelectric systems, YCrO 3 is reported to possess a centrosymmetric crystal structure which is inconsistent with the deve…
A precursor of a β-peptide derivative transforms into a hydrogelator and forms supramolecular hydrogels upon phosphatase-catalyzed dephosphorylation. This new strategy works in vitro and in vivo (see image). The enzymatic hydrogelation in vivo indicates that the β-peptide-based hydrogel exhibits a longer lifetime than…