Materials Literature
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Abstract Atom transfer radical polymerization (ATRP) was applied to synthesize a new kind of star polymers of hyperbranched polyglycerol (HPG) core with multiarms of PS‐ b ‐PtBA and PS‐ b ‐PAA by using the “core first” technique. The HPG core was obtained by anionic polymerization of glycerol first, and then the penda…
Spatial distributions of piezoelectric displacement response across the top electrode have been used in this paper to measure the piezoelectric coefficient d 33 of films based on the converse piezoelectric effect. The technical details and features of a scanning laser Doppler vibrometer have been summarized and discus…
A magnetoelectric laminate composite with electric-field-induced magnetization (EIM) effect was prepared. It was found that the phase shift of EIM in the laminate was highly sensitive to the dc magnetic field near resonance frequency. The dependence of the phase shift of EIM on the dc magnetic field was theoretically…
We present a comprehensive theoretical study of the polarizability of nanotubes and nanotube bundles modeled as periodic systems. Both static and dynamic fields are considered via our recent implementation of analytical methods for polarizability. The dynamic polarizability results in this article are nanotubes' respo…
Magnetoelectronic properties of a two-dimensional (2D) monolayer graphene are investigated by the Peierls tight-binding model. They are dominated by the period, strength, and direction of a spatially modulated magnetic field. Such a field could induce the reduction in dimensionality, change of energy dispersions, anis…
We demonstrated highly sensitive detection of carbon monoxide (CO) down to 1 ppm at room temperature using platinum-decorated single-walled carbon nanotubes (Pt-SWNTs). The obtained sensitivity to CO was 3–4 orders higher than the values reported for functionalized SWNTs, and was achieved by the controlled deposition…
We study the electromagnetic surface waves localized at an interface separating a homogeneous dielectric medium and a semi-infinite one-dimensional photonic crystal made of alternative left-handed metamaterial and right-handed material. An analytical direct matching procedure within the Kronig-Penney model was applied…
The room‐temperature refractive index is measured for three different prior cooling rates (approximately 10, 50, and 250 K/h) for two glasses especially developed for precision molding. The empirical logarithmic relationship between the cooling rate and the refractive index is also reproduced for the comparatively hig…
Purpose This paper aims to investigate the protection efficiency of a thin film of electrochemically synthesized conducting polymers, such as poly m‐toluidine, poly N‐methyl aniline, and its copolymer, poly (aniline‐co‐N‐methyl aniline) (PANINMA), on plain carbon steel in 0.1 M HCl. It also attempts to compare the pro…
Microcellular biomorphous Al 2 O 3 was produced by Al‐vapor infiltration in pyrolyzed rattan and pine wood‐derived biocarbon preforms. At 1600°C the biocarbon preforms reacted with gaseous aluminum to form Al 4 C 3 . After oxidation in air at temperatures between 1550° and 1650°C, for 3 h, the biocarbon preforms were…
Nanocrystalline barium titanate (BaTiO 3 , BT) was synthesized hydrothermally at 220°C by reacting barium hydroxide with titanium dioxide. The resulting BT nanopowders were characterized by X‐ray diffraction (XRD), selected area electron diffraction (SAED), Raman spectrum, scanning electron microscopy (SEM), and high‐…
The effects of 10 paramagnetic metal complexes (Fe(III)EDTA(H2O)-, Fe(III)EDTA(OH)2-, Fe(III)PDTA-, Fe(III)DTPA2-, Fe(III)2O(TTHA)2-, Fe(III)(CN)6(3-), Mn(II)EDTA(H2O)2-, Mn(II)PDTA2-, Mn(II)beta-EDDADP2-, and Mn(II)PO4(-)) on F- ion 19F NMR transverse relaxation rates (R2 = 1/T2) were studied in aqueous solutions as…
Hybrid polyoxometalates (POMs) [AsW15Mo3S4(H2O)3O53]9− and [AsW15Mo3O2S2(H2O)3O53]9− in which a chalcogenide cluster unit is incorporated into a classical POM structure have been prepared and characterized by X-ray analysis and 183W NMR spectroscopy. The structure of the former can be derived from that of [H2AsW18O60]…
We aim to understand the effect of plastic deformation on the structure of a polymer glass. For that purpose, we measured by neutron scattering the structure of a polymethylmethacrylate (PMMA) sample stretched both below T g ( T g − 26 K) and above T g ( T g + 30 K) over a large length scale range. We observed that th…
Purpose The purpose of this paper is to synthesise high‐purity 9,9‐bis(4‐hydroxyphenyl)‐fluorene (BHPF). Design/methodology/approach 9,9‐bis(4‐hydroxyphenyl)‐fluorene was prepared from phenol and fluorenone using cationic ion‐exchange resin as the condensation catalyst. The purity and chemical structure of the resulti…
Abstract A sol–gel process has been developed to prepare polyimide (PI)/Al 2 O 3 hybrid films with different contents of Al 2 O 3 based on pyromellitic dianhydride (PMDA) and 4,4′‐oxydianiline (ODA) as monomers. FESEM and TEM images indicated that Al 2 O 3 particles are relatively well dispersed in the polyimide matri…
In this paper, a semi-analytical method is developed to compute the elastic stiffness of nanostructures such as nanowires, nanotubes and nanofilms. Compared with existing methods for such computations, this new method is more accurate and significantly reduces the computational time. It is based on the Taylor series e…
Three different kinds of pure-phase nanowires of Ln 2 O 2 S, Ln 2 O 2 S 2, and LnS 2 with diameters of several tens of nanometers, ∼20 nm for the La-series and ∼30 nm for the Nd-series, and lengths of up to several micrometers have been successfully converted from the same starting Ln(OH) 3 (Ln = La or Nd) nanowires v…
Hierarchical nanocomposite films with Pd-PdO nanoparticles anchored uniformly on the inner surface of TiO2 nanotubes were achieved through a stepwise bioredox/artificial oxygenation approach by using the natural eggshell membrane (ESM) as a template. The Pd content ratio of Pd-PdO loading could be arbitrarily varied f…
In this paper we investigate the transient behavior of a simple active catheter: a central tube actuated by a single nitinol tendon enclosed by an outer sleeve. Dynamic models are developed to characterize the transient behavior and optimize the design of an experimental prototype. The bending mechanics are derived us…