Materials Literature
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A new approach towards the design of gold nanoshells on carboxylated polystyrene spheres (GNCPSs) is reported here. Gold nanoshells were self-assembled on the surface of carboxylated polystyrene spheres by a seed growth method. Chitosan (CHI) was used as a functional agent of carboxylated polystyrene spheres for attac…
The multiwalled carbon nanotubes (MWCNTs) wrapped with face-centered cubic ZnS nanospheres with a uniform and small diameter have been prepared to form MWCNT/ZnS heterostructures by microwave irradiation. Zinc acetate (Zn(Ac) 2 ) and thioacetamide (TAA) were used as the zinc and sulfur sources, respectively. The dispe…
In this study, the zeta potential values of vermiculite and expanded vermiculite were measured to determine the effect of pH, clay concentration, and various mono- and multivalent electrolytes including NaCl, KCl, NH4Cl, NaNO3, NaClO4, Na2SO4, Na2CO3, Na3PO4·12H2O, MgCl2·6H2O, CaCl2·2H2O, BaCl2, SrCl2·6H2O, CuCl2·2H2O…
Paramagnetic effects on the relaxation rate and shift difference of the (17)O nucleus of bulk water enable the study of water exchange mechanisms on transition metal complexes by variable temperature and variable pressure NMR. The water exchange kinetics of [Mn(II)(edta)(H2O)](2-) (CN 7, hexacoordinated edta) was rein…
A series of liquid-crystalline (LC) diblock copolymers with an azobenzene moiety in the side chain were prepared by atom transfer radical polymerization (ATRP). Using a bromo-terminated poly(methyl methacrylate) as a macroinitiator, the obtained diblock copolymers showed well-defined structures and narrow molecular-we…
Hall effect and magnetoresistance have been measured on single crystals of ${\text{NdFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ with $x=0$ $({T}_{c}=0\text{ }\text{K})$ and $x=0.18$ $({T}_{c}=50\text{ }\text{K})$. For the undoped samples, strong Hall effect and magnetoresistance with strong temperature dependence were…
Heating of l -lactide with imidazole to 98−100 °C resulted in complete polymerization within 48 h. Even-numbered cycles resulting from end-to-end cyclization were the only reaction products after 4 h, but the polymerization process was accompanied by intensive racemization. Longer reaction times favored equilibration…
We have investigated the temperature variation of the unit-cell volume of ${\text{ReO}}_{3}$ by neutron diffraction. The lattice parameter and the unit-cell volume decrease continuously as the temperature is increased from $T=2\text{ }\text{K}$ to about $T=200\text{ }\text{K}$. After exhibiting minima at about 200 K t…
The nature of the low-frequency vibrations, the so-called boson peak, in spectra of glass-forming systems remains a subject of active discussions. It appears that densification of glasses leads to significant change of the boson peak vibrations and opens additional possibility to verify different model predictions. We…
In this paper, we report a facile large-scale synthesis of the “smallest” (i.e., unimolecular) polymeric Janus nanoparticles from a polystyrene- b -poly(2-vinylpyridine)- b -poly(ethylene oxide) (PS- b -P2VP- b -PEO or SVEO) triblock copolymer by efficient intramolecular cross-linking of the middle P2VP block using 1,…
The corrosion of alumina‐toughened zirconia (ATZ) as a consequence of hydrothermal treatment was investigated, especially the transformation kinetics from tetragonal zirconia to the monoclinic phase. For this purpose, polished ATZ specimens ( R a <5 nm) were aged in water vapor at different temperatures ranging fro…
Small molecule-based amorphous materials involving unsymmetrical triarylamines exhibit multicolor emission as transparent thin films and nanoparticles under single UV wavelength excitation. Tuning of the emission originally stems from combined interbranch energy transfer and intramolecular charge transfer leading to b…
The incorporation of copper iodide clusters in sol−gel silica has been investigated to prepare materials with original luminescent properties. The synthesis, structural characterizations, and optical properties of sol−gel films containing [Cu 4 I 4 L 4 ] clusters, L = phosphine-based ligands, are reported. Clusters st…
Large macrocyclic poly(chloroethyl vinyl ether)s (PCEVE)s of controlled ring size and narrow distribution were synthesized by a ring-closure process involving the intramolecular formation of acetal linkages between the two external blocks of linear ABC triblock precursors prepared by living cationic polymerization. Th…
A discrete 2-nm-sized self-assembled organic capsule was formed from the union of six hexagram-shaped amphiphile molecules in aqueous methanol due to the hydrophobic effect, van der Waals forces, and CH-pi interactions between the chemical components. A couple of hexa-substituted benzene molecules were encapsulated in…
We recently reported that the photoisomerization of molecular motors used as chiral dopants in a cholesteric liquid crystal film induces a rotational reorganization which can be observed by optical microscopy and produces the motion of microscopic objects placed on top of the film (Feringa, B. L.; et al. Nature 2006,…
An analytical description for plane-wave propagation in metamaterials is presented. It follows the usual approach for describing light propagation in homogeneous media on the basis of Maxwell's equations, although applied to a medium composed of metallic nanostructures. Here, as an example, these nanostructures are do…
An analysis of recent experimental data for high-performance In0.7Ga0.3As high electron mobility transistors (HEMTs) is presented. Using a fully quantum mechanical, ballistic model, we simulate In0.7Ga0.3As HEMTs with gate lengths of LG = 60nm, 85, and 135 nm and compare the result to the measured I-V characteristics…
PART I: NATURAL POLYMER BLENDS AND COMPOSITES. 1. Polymers from Renewable Resources (L. Yu and L. Chen). 1.1 Introduction. 1.2 Natural Polymers. 1.3 Synthetic Polymers from Natural Monomers. 1.4 Polymers from Microbial Fermentation. 1.5 Summary. 2. Starch - Cellulose Blends (I. S. Arvanitoyannis and A. Kassaveti). 2.1…
Brillante Kugeln: Eine einfache und hoch effiziente Synthese von mesoporösen Einzel- und Mehrkomponenten-Metalloxidkugeln kombiniert verdampfungsinduzierte Assoziation mit essigsäurevermittelten Sol-Gel-Prozessen. Die Mikrokugeln mit großer Oberfläche und hoher Gerüstkristallinität bieten sich für viele Anwendungen in…