Materials Literature
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The solubilities of dexamethasone sodium phosphate in different solvents were measured using a synthetic method. The laser monitoring observation technique was used to determine the disappearance of the solid phase in a solid + liquid mixture. The solubility data were correlated with Apelblat equation.
We demonstrate a hydrostatic pressure-induced hard-to-soft transition of an isolated single wall carbon nanotube, using classical and ab initio constant-pressure molecular-dynamics simulations and continuum elastic theory analysis. At low pressure, the carbon tube is hard. Above a critical pressure, the tube becomes m…
Dynamic light scattering has been used to determine the hydrodynamic thickness of poly(ethylene oxide) (PEO) adsorbed on synthetic anisotropic clay particles (Laponite) as a function of molecular weight. The layer thicknesses, and their increase with molecular weight, indicate that the conformation of the adsorbed lay…
The monodisperse ZnS nanospheres, with an average diameter of 100 nm, were synthesized through a solvothermal method. Strong photoluminescence emission from blue to green and orange can be observed by doping these ZnS nanospheres with various cations (Mn 2+, Cu 2+, Al 3+ ). An investigation is reported on the coating…
Streptomyces sp. strain K30 was isolated from soil next to a city high way in Münster (Germany) according to its ability to degrade natural and synthetic poly(cis-1,4-isoprene) rubber and to form clear zones on natural rubber latex agar plates. The clear zone forming phenotype was used to clone the responsible gene by…
Multiphonon resonant Raman scattering (RRS) was studied in unintentionally doped bulk $\mathrm{ZnO}$ crystals and layers, including nanostructured and highly conductive films, excited by 351.1 and $363.8\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ laser lines in the temperature interval from 10 to $300\phantom{\rule{0.3em}…
Abstract A novel nanomagnesium hydroxide powder and three kinds of micro‐Mg(OH) 2 , with different particle sizes, were chosen as fillers and mixed with ethylene–propylene–diene monomer rubber (EPDM) to form a series of composites by a traditional rubber‐processing technique. The results showed that the mechanical pro…
First, second and third nearest neighbor mixing potentials for FePt alloys, were calculated from first principles using a Connolly-Williams approach. Using the mixing potentials obtained in this manner, the dependency of equilibrium L1_0 ordering on temperature was studied for bulk and for a spherical nanoparticle wit…
We analyze in detail the fluctuations and correlations of the (spatial) Fourier modes of nano-scale single-layer islands on (111) fcc crystal surfaces. We analytically show that the Fourier modes of the fluctuations couple due to the anisotropy of the crystal, changing the power spectrum of the fluctuations, and that…
Polyglycerol dendrimers (PGDs) with 4-5 generations were synthesized and used to investigate the effect of dendritic architecture and its generation on aqueous solubilization of paclitaxel (PTX), a poorly water-soluble drug. Chemical and physical properties of the PGDs were characterized by NMR, MALDI-TOF mass, GPC, v…
Preface. 1 Introduction. Introduction to the nature of colloidal solutions. The forces involved in colloidal stability. Types of colloidal systems. The link between colloids and surfaces. Wetting properties and their industrial importance. Recommended resource books. Appendices. 2 Surface Tension and Wetting. The equi…
Abstract Although wood–plastic composites have become more accepted and used in recent years and are promoted as low‐maintenance, high‐durability building products, they do experience a color change and a loss in mechanical properties with accelerated weathering. In this study, we attempted to characterize the modulus…
Electrospinning has developed as a unique and versatile process to fabricate ultrathin fibers in the form of nonwoven meshes or as oriented arrays from a variety of polymers. The very small dimension of these fibers can generate a high surface area, which makes them potential candidates for various biomedical and indu…
We report experimental data on two types of natural silica, differing for their OH content, irradiated with UV photons (4.66 eV) from a pulsed Nd:YAG laser. Irradiation induces a reduction of the absorption band at 5.12eV and of the associated emissions at 3.14eV and 4.28eV, ascribed to twofold coordinated Ge (=Ge'')…
The question addressed is whether magnetic materials based on physical small world networks are possible. Physical constraints, such as uniform bond length and embedding in three dimensions, are the new features added to make small world networks physical. Results are presented to further determine if physical small w…
We investigated the kinetics of H(II) centers (=Ge'-H) in natural silica under repeated 266nm UV irradiations performed by a Nd:YAG pulsed laser. UV photons temporarily destroy these paramagnetic defects, their reduction being complete within 250 pulses. After re-irradiation, H(II) centers grow again, and the observed…
Density-functional studies of the electron states in the dilute magnetic semiconductor $\mathrm{GaN}:\mathrm{Mn}$ reveal major differences for the case of the $\mathrm{Mn}$ impurity at the substitutional site $({\mathrm{Mn}}_{\mathrm{Ga}})$ versus the interstitial site $({\mathrm{Mn}}_{\mathrm{I}})$. The splitting of…
A continuum (Mullins-type) model is formulated for the isotropic evolution of a solid surface on which the mass transport occurs by oscillatory surface diffusion. The time-space oscillations of diffusivity are assumed to be induced by external source(s); a number of possible sources, different in their physical nature…
ADVERTISEMENT RETURN TO ISSUEPREVArticleHigh Magnetic Fields: A Tool for Studying Electronic Properties of Layered Organic MetalsMark V. KartsovnikView Author Information Walther-Meissner-Institut, Bayerische Academie der Wissenschaften, Walther-Meissner-Strasse 8, D-85748 Garching, Germany Cite this: Chem. Rev. 2004,…
The crystal and molecular structure, together with the hydrogen-bonding system in ammonia-mercerized cellulose III I, has been determined using synchrotron X-ray and neutron fiber diffraction data. The structure has a one-chain monoclinic unit cell with an asymmetric unit that contains only one glucosyl residue and wi…