Materials Literature
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Effect of confinement is investigated on optical phonons of different symmetries in the nanoparticles of zinc oxide with wurtzite structure using Raman spectroscopy. An optical phonon confinement model is used for calculating the theoretical line shapes, which exhibit different asymmetric broadening and shifts, depend…
The synthesis of II−VI semiconductor nanocrystals doped with transition metals has proved to be particularly difficult. In the case of CdSe quantum dots (QDs) produced via high-temperature pyrolysis in trioctylphosphine oxide (TOPO), specially designed precursors used in this study appear to be necessary to successful…
The single biggest challenge now facing drug delivery (for liposomes and indeed other carriers) is to initiate and produce release of the encapsulated drug only at the diseased site and at controllable rates. Our efforts have focused on developing a new thermal-sensitive drug delivery system, specifically for the loca…
Inorganic nanoparticles of different nature and size can be combined with the conducting polymers, giving rise to a host of nanocomposites with interesting physical properties and important application potential. Such nanocomposites have been discussed in this review, throwing light on their synthesis techniques, prop…
The recognition of the potential for enhanced fracture toughness that can be derived from controlled, stress‐activated tetragonal ( t ) to monoclinic ( m ) transformation in ZrO 2 ‐based ceramics ushered in a new era in the development of the mechanical properties of engineering ceramics and provided a major impetus f…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMedium-Controlled Aggregation of trans-StilbeneJavier Catalán, László Zimányi, and Jack SaltielView Author Information Departamento de Quimica Fisica Aplicada Universidad Aut\noma de Madrid, Spain Department of Chemistry, Florida State University Tallahassee, Florida 3…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationIn Situ Characterization of the Surface Reaction between Chemisorbed Ammonia and Oxygen on Pt{100}Minseok Kim, Stephanie J. Pratt, and David A. KingView Author Information Department of Chemistry, University of Cambridge Lensfield Road, Cambridge CB2 1EW, U.K. Cite this: J…
Summary The effect of lignocellulosic materials on the board performance of thermoplastic polymer/wood composites was examined by using soft wood flours of 20 mesh- and 120 mesh-pass, steam-exploded beech flour, and two kinds of thermoplastic polymers, polyvinyl chloride and polystyrene. Steam-exploded wood flour was…
In this paper, we report that the interfacial interaction in polyimide (PI)/silica hybrid composites can be characterized by a fluorescence spectroscopy. We found that silica shows different effects on the fluorescence behavior of polyimide based on biphenyltetracarboximide (BPDA) depending on the type of diamine, tha…
Precursors of formula [Ce(hfac) 3 {MeO(CH 2 CH 2 O) n Me}], 1 ( n = 1), 2 ( n = 2), and 3 ( n = 3), and [{Ce(hfac) 3 } 2 {μ-MeO(CH 2 CH 2 O) 4 Me}], 4 (hfac = CF 3 COCHCOCF 3 ), have been prepared and used as precursors for chemical vapor deposition (CVD) of films of cerium oxides on the substrates Si, Pt, and TiN. Th…
Alkali-solubilized collagens, prepared by alkali-acid extraction and alkali direct extraction (abbreviated AASC and ALSC, respectively), were characterized by dynamic viscoelastic measurement of collagen solution (10 mg/mL). The optimum preparative conditions in terms of yield and polypeptide size are as follows: for…
Uptake of gas-phase NO 2 by water was studied in both the droplet train and bubble train flow reactors. Aqueous surface reaction of NO 2 (g), reported previously in the literature, is not substantiated by these studies. The uptake of NO 2 (g) is a function of Henry's law coefficient ( H NO 2 ) and the second-order NO…
Mesomorphic dimeric compounds consisting of rigid mesogenic cores and flexible oxyethylene chains have been prepared as liquid-crystalline materials capable of complexing with ionic species. The incorporation of LiCF 3 SO 3 into these materials results in the induction of smectic A phases and significant mesophase sta…
We consider a single spin in a constant magnetic field or an anisotropy field. We show that additional external time-periodic fields with zero mean may generate nonzero time-averaged spin components which are vanishing for the time-averaged Hamiltonian. The reason is a lowering of the dynamical symmetry of the system.…
The crystal structure of the 2H perovskite BaMnO 3 has been refined from neutron powder diffraction data collected at room temperature and 80 and 1.7 K. The structure consists of chains of face-sharing MnO 6 octahedra, separated by Ba 2+ cations. At room temperature, a = 5.6991(2), c = 4.8148(2) Å, space group P 6 3 /…
Neutron inelastic scattering measurements of the polar TO phonon mode in the cubic relaxor Pb(Mg1/3Nb2/3)O3, at room temperature, reveal anomalous behavior similar to that recently observed in the Pb(Zn1/3Nb2/3)_{0.92}Ti_{0.08}O3 system in which the optic branch appears to drop precipitously into the acoustic branch a…
We demonstrate, using well-established nonequilibrium limited-mobility solid-on-solid growth models, that mound formation in the dynamical surface growth morphology does not necessarily imply the existence of a surface edge diffusion bias (the Schwoebel barrier). We find mounded morphologies in several nonequilibrium…
New developments in quantitative sputter depth profiling during the past ten years are reviewed, with special emphasis on the experimental achievement of ultrahigh depth resolution (below 2 nm for sputtered depths larger than 10 nm). In this region, the depth resolution function generally is asymmetric (i.e.non-Gaussi…
Porous polymeric media (polymer foams) are utilized in a wide range of applications, such as thermal and mechanical insulators, solid supports for catalysis, and medical devices. A process for the production of polymer foams has been developed. This process, which is applicable to a wide range of polymers, uses a hydr…
The first example of an active layered tantalate photocatalyst containing partly filled lanthanide 4f shell is reported. A single phase of layered perovskite tantalates, RbLnTa 2 O 7, could be obtained with Ln = La, Pr, Nd, and Sm; the ionic radii of these trivalent cations are required to be larger than 0.126 nm for…