Materials Literature
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We report on ab initio molecular dynamics simulations of the early stages of single-walled carbon nanotube (SWCNT) growth on metal nanoparticles. Our results show that a sp2 bonded cap is formed on an iron catalyst, following the diffusion of C atoms from hydrocarbon precursors on the nanoparticle surface. The weak ad…
A novel high flux filtration medium, consisting of a three-tier composite structure, i.e., a nonporous hydrophilic nanocomposite coating top layer, an electrospun nanofibrous substrate midlayer, and a conventional nonwoven microfibrous support, was demonstrated for oil/water emulsion separations for the first time. Th…
Calculations of the quantum-mechanical ballistic thermal conductance of single-walled carbon nanotubes, graphene, and graphite are presented, which explain previous experimental results, and directly disprove earlier theoretical calculations. The ballistic thermal conductances are smaller than had been previously thou…
Multifunctional cancer therapeutic nanodevices have been designed and synthesized using the poly(amidoamine) (PAMAM) dendrimer as a carrier. Partial acetylation of the generation 5 (G5) PAMAM dendrimer was utilized to neutralize a fraction of the primary amino groups, provide enhanced solubility of the dendrimer durin…
We present direct evidence for room-temperature magnetization reversal induced by an electric field in epitaxial ferroelectric BiFeO3-ferrimagnetic CoFe2O4 columnar nanostructures. Piezoelectric force microscopy and magnetic force microscopy were used to locally image the coupled piezoelectric-magnetic switching. Quan…
Nanotechnology is expected to open new avenues to fight and prevent disease using atomic scale tailoring of materials. Among the most promising nanomaterials with antibacterial properties are metallic nanoparticles, which exhibit increased chemical activity due to their large surface to volume ratios and crystallograp…
We report that the measurements of the pyroelectric current of the pre-poled [111]-oriented 0.955 Pb(Zn 1/3 Nb 2/3 ) O 3 –0.045 PbTiO 3 (PZN-4.5%PT) single crystals can shed some light on the phase transition and spontaneous polarization characters of this material in a similar way to measures of remanent polarization…
The perovskite bilayers La 0.67 Ca 0.33 MnO 3 (LCMO) (100 nm) / La 0.67 Sr 0.33 MnO 3 (LSMO) (100 nm) and LSMO (100 nm) / LCMO (100 nm) are fabricated by a facing-target sputtering technique. Their transport and magnetic properties are investigated. It is found that the transport properties between them are different…
This study is presented on the frozen strain in XLPE measured by means of a thermomechanical analysis (TMA). The magnitude of the strain in XLPE insu lated cables ranges from 2 to 8 % and the cable insulation is stressed in tension for the axial and azimuthal directions and compression for the radial direction. Thermo…
An Au/α-Fe 2 O 3 −γ-Al 2 O 3 catalyst (0.96% (w/w) of Au and 4.8% of Fe 2 O 3 ) was tested for activity and selectivity in an isothermal flat-bed reactor. Very good activity and selectivity values were measured for different operation temperatures and compositions. The reaction rate parameters of carbon monoxide and h…
A figure of merit (FOM) Z = U p /τ r , where U p is the peak voltage, and τ r is the rise time of the laser-induced thermoelectric voltage (LITV) signal, is defined for photodetector based on the LITV and the influence of the parameters on FOM is analysed based on the time dependence of LITVs in La 1− x Ca x MnO 3 (LC…
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Single crystals of ZrAs 1.4 Se 0.5 (PbFCl-type structure) were grown by chemical vapour transport. While their thermodynamic and transport properties are typical for ordinary metals, the electrical resistivity exhibits a shallow minimum at low temperatures. Application of strong magnetic fields does not influence this…
A microcalorimeter is studied for testing heat capacity of thin films. The microcalorimeter is a suspended membrane supported by six microbridges, which is fabricated by the front-side surface micromachining. Compared to the bulk micro-machined one, the microcalorimeter has excellent mechanical strength and precisely…
Abstract In this study, cyclic olefin copolymer (COC)/layered silicate nanocomposites (CLSNs) were prepared by the intercalation of COC polymer into organically‐modified layered silicate through the solution mixing process. Both X‐ray diffraction data and transmission electron microscopy images of CLSNs indicate most…
Abstract A regioselective synthetic route that allows the construction of tri‐functionally substituted cyclen is described. This facilitates the synthesis of a europium complex that exhibits a good photoresponse to malate, forming the basis of a chemoselective sensor. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Wei…
The structures of the new compound La(1.2)Sr(2.7)IrO(7.33) and the recently discovered La(1.2)Sr(2.7)RuO(7.33) have been solved using a combination of X-ray and neutron diffraction. Both compounds crystallize in the trigonal space group Rm and consist of isolated MO6 (M = Ru, Ir) octahedra, which are arranged in well-…
Numerical simulation has been carried out to analyze several unique buckling and postbuckling behaviors of superelastic shape memory alloy (SMA) columns observed from experimental evidences. Comparison of the experimental critical load with analytical predictions verifies the fact that physical nonlinearity should be…
Studies on the synthesis of high molecular weight polybenzoxazoles (PBOs) in polyphosphoric acid (PPA) and investigations of their hydrolytic stability in aqueous methanesulfonic acid are described. The polymerization of PBOs based upon 2,2′-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (6FAP) and 4,4′-oxydibenzoic a…
Examinations of CO2 formed during steady-state CO oxidation reactions were performed using infrared (IR) chemiluminescence. The CO2 was formed using a molecular-beam method over Pd(110) and Pd(111). The CO2 formation rate is temperature dependent under various partial pressure conditions. The temperature of the maximu…