Materials Literature
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Doping of the ferroelectric Sm-C(*) phase with bent-shaped molecules induces the antiferroelectric Sm-C(*)(A) phase. The effect was observed by means of electro-optic and dielectric measurements in systems with weak interlayer interactions in which the relative strength of anticlinic-synclinic order between molecules…
A critical behavior of dielectric susceptibility has been discovered in relaxor ferroelectric 0.75Pb(Mg1/3Nb2/3)O3–0.25PbTiO3. The real part of permittivity ε′ was found to follow the relation ε′−ε∞=χ′∝(T−T0)−2 at T>T0, and ε′∝(TC−T)−1 at T<TC, where T0≈TC<Tm; Tm is the temperature of the diffused…
Room- and low-temperature electroluminescence (EL) in the visible range was observed from a single layer of silicon nanocrystals in between two thin SiO2 layers. The EL peak wavelength exhibited tunability from the red (∼800 nm) to the yellow (∼600 nm) depending on the excitation voltage. By decreasing the temperature…
We have investigated the magnetic and magnetotransport properties of (Ga, Mn)As/(Al, Ga)As/(Ga, Mn)As semiconductor-based magnetic trilayer structures. We observe a weak ferromagnetic interlayer coupling between the two ferromagnetic (Ga, Mn)As layers as well as magnetoresistance effects due to spin-dependent scatteri…
High-quality, c-oriented ZnO epitaxial films have been grown on the a surface using molecular-beam epitaxy. The use of a-oriented sapphire eliminates rotational domains and related structural defects which have limited the use of ZnO in electronic applications. The ZnO epitaxial layers are uniquely oriented with the Z…
We use neutron scattering to demonstrate the presence of lattice polarons and their short-range correlations for several samples of La1-xCaxMnO3 in the Ca doping range 0.15</=x</=0.3. We establish the doping dependence of the orientation, commensuration, and coherence length of the polaron correlations and show that t…
Polarized Raman spectra were obtained from a rope of aligned semiconducting single-wall nanotubes (SWNTs) in the vicinity of the $D$ band and the $G$ band. Based on group theory analysis and related theoretical predictions, the $G$-band profile was deconvolved into four intrinsic SWNT components with the following sym…
We have analyzed the unusual electronic structure of Sr2FeMoO6 combining ab initio and model Hamiltonian approaches. Our results indicate that there are strong enhancements of the intra-atomic exchange strength at the Mo site as well as the antiferromagnetic coupling strength between Fe and Mo sites. We discuss the po…
We present evidence of a relatively high dimensionless figure of merit (ZT) in a polycrystalline skutterudite partially filled with ytterbium ions. The small-diameter yet heavy-mass Yb atoms partially filling the voids of the host CoSb3 system exhibit low values of thermal conductivity while the quite favorable electr…
PURPOSE: Stealth liposomal doxorubicin (Alzal Corp, Palo Alto, CA) has a slower clearance rate than free doxorubicin, resulting in sustained serum levels. Liposomal encapsulation also leads to increased concentration of drug in tumor tissue. Meta-analysis of previous studies has shown that doxorubicin has activity in…
The preparation of copolycarbonates containing porphyrin or fullerene units in the main chain is described. The syntheses were performed inserting the “special groups” in bisphenol A polycarbonate (PC) molecules by prolonged heating at 240 °C of PC mixtures with different amounts (5−30 wt %) of porphyrin or fullerene…
A series of new rigid−flexible copolyethers containing blue- and yellow-emitting conjugated segments have been synthesized. The thermal, mechanical, and optical properties of the polymers are controlled by the type of the comonomers, their ratio at the preparation stage, and the length of the flexible spacer, as well…
Two new SF 5 -terminated perfluoroalkylsilanes SF 5 (CF 2 CF 2 ) n CH 2 CH 2 SiCl 3 ( n = 1 and 2) were synthesized by addition of trichlorosilane to the corresponding synthetic SF 5 -terminated perfluoroalkenes by hydrosilylation. Thin films of these SF 5 -silanes on clean silicon oxide substrates were characterized…
Two very large cyclophanes (3, C(132)H(92)O(8)S(4); 4, C(172)H(120)O(8)S(4)) were prepared by means of short syntheses ( approximately 5 steps) from commercial starting materials. In each of these cyclophanes, two octaphenylnaphthalene subunits or two 1, 3-bis(pentaphenylphenyl)benzene subunits were tethered to form t…
The present study reports the development of kinetic probes to determine the possible role of hydroxyl radicals in the polyoxometalate-mediated photocatalytic oxidation of aqueous chlorinated organic compounds. Photocatalytic oxidation of the model chloroaromatic 1,2-dichlorobenzene (DCB) was carried out in oxygenated…
An unresolved issue of peroxidase activity is the role played by the hydrogen bond between the proximal histidine ligand and a highly conserved aspartate group. It has been postulated that this hydrogen bond imparts imidazolate character to the axial ligand, increasing its donating ability and stabilizing the high val…
The melt intercalation and curing behavior of phenolic resin (P1) were investigated by use of layered silicates, such as pristine montmorillonite (PM), dodecylammonium-modified montmorillonite (C12M), octadecylammonium-modified montmorillonite (C18M), benzyldimethyloctadecylammonium-modified fluorohectorite (C18BH), a…
Mesoporous silica SBA-15 molecular sieves have been incorporated with various amounts of vanadium via incipient-wetness impregnation with vanadium oxide triisopropoxide in hexane followed by calcination. The products (VSBA-15) have been characterized by nitrogen adsorption and diffuse reflectance UV−visible and electr…
An analogy between combinatorial chemistry and Monte Carlo computer simulation is pursued. Examples of how to design libraries for both materials discovery and protein molecular evolution are given. For materials discovery, the concept of library redesign, or the use previous experiments to guide the design of new exp…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAssembly of Gold Nanostructured Films Templated by Colloidal Crystals and Use in Surface-Enhanced Raman SpectroscopyPeter M. Tessier, Orlin D. Velev, Anand T. Kalambur, John F. Rabolt, Abraham M. Lenhoff, and Eric W. KalerView Author Information Department of Chemical…