Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAssembly of Phenylacetylene-Bridged Silver and Gold Nanoparticle ArraysJames P. Novak and Daniel L. FeldheimView Author Information Department of Chemistry, North Carolina State University Raleigh, North Carolina 27695 Cite this: J. Am. Chem. Soc. 2000, 122, 16, 3979–3…
ABSTRACT: The effects of moisture sorption on physical properties of native and cross‐linked starch films in the glassy state were studied. Water played a dual role as a plasticizer or an antiplasticizer, depending on the physical property measured. Plasticizing effects were clearly evident in the case of the calorime…
ZnO thin films were epitaxially grown on α-Al2O3 (0001) substrate by radio-frequency (rf) magnetron sputtering. Among the ZnO films deposited at 550 °C, the film deposited at 80 W has the narrowest full width half maximum (FWHM) of x-ray diffraction (XRD) θ-rocking curve, 0.16°, indicating a highly c-axis oriented col…
Room-temperature white light emission can be obtained from a family of europium-containing hybrid materials called di-ureasils—organically modified silicates in which oxyethylene chains of different length are grafted by means of urea crosslinks to the siliceous backbone. It is demonstrated that the emission color may…
IEEE Electrical Insulation Magazine engineer might use this only for a basic understanding of the method and rather use a commercial FEA software that is widely available today. The book ends with a chapter on the design considerations in an avionics electronic package. Engineers who need to perform back-ofthe-envelop…
A general purpose transformation vector, designated pPha‐T1, was constructed for use with the diatom Phaeodactylum tricornutum Bohlin. This vector harbors the sh ble cassette for primary selection on medium containing the antibiotic zeocin, and a multiple cloning site flanked by the P. tricornutum fcp A promoter. pPha…
QPA (quantitative phase analysis) of polycrystalline materials using XRPD (X-ray powder diffraction) can be performed using the combined Rietveld and reference intensity ratio (RIR) methods, providing an estimate of both the crystalline and the amorphous phase in a mixture. Although the accuracy of estimates of the ph…
The impedance of the cubic perovskite BaZr 0.9 Y 0.1 O 3‐δ has been systematically investigated in dry and wet atmospheres at high and low oxygen partial pressures. In the grain interior, conductivity contributions from oxygen ions, electron holes, and protons can be identified. Below 300°C, proton conduction dominate…
The formation of nanostructured materials by using colloidal crystals as templates is a relatively new but rapidly growing area of materials science. Colloid crystalline templates are three-dimensional close-packed crystals of submicrometer spheres, whose long-ranged ordered structure is replicated in a solid matrix,…
Carbon nanotube (CNT) dopants can improve both the strength and conductivityof polypyrrole (PPy), as reported here. A novel electrochemical method is described for the synthesis of these CNT–PPy composites. Evidence is presented that PPy forms remarkably uniform coatings on individual CNTs, and can also join one coate…
For small-angle scattering, of X-rays (SAXS) and neutrons (SANS), the importance of absolute calibration has been recognized since the inception of the technique. The work reported here focuses on SAXS measurements using Kratky slit systems. In former days, only molecular weights or scattering per particle were determ…
Polycrystalline bulk samples of Ti 3 Al 1.1 C 1.8 have been fabricated by reactively hot isostatically pressing a mixture of titanium, graphite, and Al 4 C 3 powders at a pressure of 70 MPa and temperature of 1400°C for 16 h. The hot isostatically pressed samples are predominantly single phase (containing ∼4 vol% Al 2…
Ordered arrays of nickel nanowires have been prepared using pulsed electrodeposition. Two self-patterning anodization processes were used to fabricate alumina pore matrices into which nickel was deposited from a Watts bath: two short millisecond deposition pulses followed by a long delay yielded almost 100 % filled po…
The perovskitelike ferroelectric system ${\mathrm{PbZr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ (PZT) has a nearly vertical morphotropic phase boundary (MPB) around $x=0.45--0.50.$ Recent synchrotron x-ray powder diffraction measurements by Noheda et al. [Appl. Phys. Lett. 74, 2059 (1999)] have revealed…
The article presents the state-of-the-art of alternating physisorption of oppositely charged polyelectrolytes, the so-called “layer-by-layer” method or “electrostatic self-assembly” (ESA), for the preparation of thin polymer coatings. In comparison to other, more established self-organization techniques, this recent m…
An overview of one of the most successful conducting polymers, poly(3,4-ethylenedioxythiophene) (PEDT) and its derivatives, is presented, detailing its early development, the synthesis of numerous hybrid and derivative materials, along with a description of the broad array of properties accessible and a description of…
We study theoretically the equilibrium properties of a rod−coil diblock copolymer melt confined between two flat plates. We assume that the system forms lamellae in the bulk. The plates may have a preference for either the rods or coils. We investigate whether the preferred alignment of the lamellae is parallel or per…
The role of the physical network in the dynamics of macromolecules is considered. It is shown that experimental data are often inconsistent not only quantitatively but also qualitatively with the results obtained in terms of the widespread reptation model based on the concept of network entanglement. Evidence is given…
The X-ray crystal structures of K6[CoII W12O40]·~16H2O and K5[CoIIIW12O40]·~16H2O are reported. The compounds are isostructural, hexagonal, space group P 6222, and have Z 3 with a 19.118(7), c 12.383(9) Å, V 3919.6(35) Å3 , and a 19.111(2), c 12.509(2) Å, V 3956.6(9) Å3 , respectively. Both anions exhibit the standard…
Three explicit mathematical models have been developed to predict glass transition temperatures of binary polymer−diluent and polymer−salt systems as well as ternary polymer−diluent−salt systems based on the configurational entropy model and the Flory−Huggins theory. In the presence of salt, the specific ionic interac…