Materials Literature
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The self-assembly behavior of the complexes of DNA with fully surface-protonated poly(amidoamine) (PAMAM) dendrimer of generation four has been studied as a function of the overall complex composition. The complex composition ( x ) was expressed by the molar ratio of the positively charged ammonium groups in the dendr…
Thin V2O3 films were deposited on a piezoelectric substrate by electron-beam evaporation. Surface acoustic waves were generated by interdigital transducers. The attenuation and sound velocity were investigated from 260 to 10 K, providing an insight into the temperature-dependent electrical, dielectrical, and elastic p…
Abstract One-dimensional coordination polymer of [Ru2(piv)4(μ-CN)W(CN)7]n2n− (Hpiv = pivalic acid) has been synthesized in the presence of PPh4+. The X-ray crystal structure reveals an alternating arrangement of ruthenium(II,III) dimers and [W(CN)8]3− ions in a 1-D chain. The magnetic susceptibility data (4.5–300 K) s…
In ferroelectric materials, hysteresis behavior is very difficult to model due to its nonlinear and history-dependent characteristics. Among approaches that are able to describe unsaturated loops, many of them are either very complicated (numerical procedures must be employed) or the resulting loops contain some undes…
We have synthesized ferroelectrics of M6Ti2Nb8O30 (M=Ba, Sr) with filled tungsten-bronze structure. The microstructures and dielectric properties of the present materials have been investigated as well as the behavior and features of the ferroelectric phase transition. Similar to perovskite ABO3, tungsten-bronze struc…
The gallium-modified bismuth ferrite-lead titanate compositions of 0.4Bi(Ga0.4Fe0.6)O3-0.6PbTiO3 (0.4BGF-0.6PT), has been investigated for the potential as a high-field and high-temperature piezoelectric ceramic. The crystalline solutions of 0.4BGF-0.6PT were fabricated by using the solid-state reaction method. X-ray…
The effects of Ca doping on the Curie temperature, structural, dielectric, and elastic properties of Ba0.4Sr0.6−xCaxTiO3 (0⩽x⩽0.3) has been studied. Powder x-ray diffraction revealed that the cubic lattice constant a decreases linearly with increasing x from 0 to 0.15, while showing an anomalous expansion between x=0.…
We have used molecular-dynamics simulations to examine the displacement threshold energy (Ed) surface for cations and anions in Gd2Ti2O7 and Gd2Zr2O7 pyrochlores. In both pyrochlores, the Ed surface is highly anisotropic and it requires less energy to displace anions than cations. Both anion and cation Ed values are h…
We report an enhancement effect of ultraviolet illumination on the photoluminescence intensities of zinc oxide thin films. Large-grain ⟨0001⟩-textured zinc oxide thin films were deposited on amorphous-fused silica substrates using pulsed laser deposition. We found that the intensities of excitonic emission and green-b…
An investigation was carried out by dielectric relaxation spectroscopy (DRS) and dynamic mechanical spectroscopy (DMS) on the dynamics of aqueous solutions of deoxyribonucleic acid (DNA). Novel information is generated and presented through our use of wide temperature and frequency range in DRS and DMS measurements. T…
The phenomenon of time-dependent polarization loss in poled ferroelectric capacitors, also known as retention, represents one of the most important reliability issues for ferroelectric nonvolatile memories. In a number of publications different ways to control retention by varying ferroelectric material composition or…
The role of anchoring the mesogenic side chains at the internal and boundary interfaces in the thin film morphology has been investigated for two fluorinated side-chain liquid crystalline/amorphous diblock copolymers. Initial bulk investigations indicate that the two polymers strongly microphase segregate into a cylin…
Abstract The first titanium(IV) complexes with cyclic tetrasiloxide ligands, [Ti(L1H)(OSiMe3)]2(H2O) (1) and (CpTiCl)4(L2)2 (2), were synthesized using the all-cis isomer of cyclotetrasiloxanetetraols R4(SiO)4(OH)4 (L1H4: R = Ph, L2H4: R = iPr) as ligand precursors. X-ray analysis revealed that 1 is a dinuclear comple…
We describe the preparation of solution-processible hybrid polymers, consisting of a polythiophene main chain and randomly distributed alkyl and oligoaniline side groups. The proposed procedure involves three steps: copolymerization of alkyl- and ester-group-substituted thiophenes to give the precursor polymer, follow…
We have investigated the effects of surface modification on photoluminescence (PL) properties of CdS quantum dots (QDs) prepared by a reverse-micelle method. It is demonstrated that the modification of QD surface with a Cd(OH)2 layer leads to a strong enhancement of the band-edge PL intensity of CdS QDs in reverse mic…
We report on the photoluminescence (PL) properties of quasialigned ZnCdO single-crystal nanorods prepared by thermal evaporation of Zn and CdCl2 on a Si substrate using Au as a catalyst. The temperature-dependent PL spectra of the ZnCdO nanorods show that each spectrum displays an intense near-band-edge (NBE) emission…
Oblique-incidence physical vapor deposition has been used to create optical thin films with a polygonal helix-shaped nanostructure. A series of titanium dioxide thin films are investigated, including triangle, square, pentagon, and star-shaped polygonal helices. Experimental optical measurements reveal a double-handed…
The pyroelectric properties of (1−x)Pb(Mg1∕3Nb2∕3)O3–xPbTiO3 (PMN–xPT) single crystals have been investigated over a broad composition range of 0.13⩽x⩽0.40. The best pyroelectric performances are achieved in ⟨111⟩-oriented PMN–0.26PT single crystal. At room temperature, the figures of merit for voltage responsivity an…
Photoluminescence from zinc oxide (ZnO) nanoparticles, nanorods, microparticles, and single crystals was measured under various conditions of ultraviolet excitation. Near-band-gap and deep-level emissions were observed from all samples. The intensities of both emissions from each ZnO sample exhibited a different nonli…
A unique trinuclear cluster containing two short Pt-->Ag dative bonds was prepared and characterized crystallographically. Two monocationic orthometalated Pt(II) complexes containing 2-phenylpyridine and the tridentate ligand 9S3 (1,4,7-trithiacyclononane) exhibit axial sulfur interactions with Pt as well as short dat…