Materials Literature
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In this study, the electrical conductivity of undoped nanocrystalline thin films of cerium dioxide was studied by impedance spectroscopy in the temperature range from room temperature to in different atmospheres. Two types of films were studied: sample 1, a strongly oriented columnar film (thickness ); and sample 4, a…
An approach to the synthesis and the organization of magnetic bimetallic NiFe nanoparticles of controlled size and composition was developed using thermolysis of the cyano-bridged Ni2+/[Fe(CN)6]3− coordination polymer nanoparticles anchored within a hybrid mesostructured silica either under argon or under hydrogen atm…
The clusters Ti6O4(OPr)8(endo,exo-OOC–Norb)8, Zr6O4(OH)4(endo-OOC–Norb)12 and Zr6O4(OH)4(exo-OOC–Norb)12(BuOH) were prepared by the reaction of 5-norbornene-2-carboxylic acid (HOOC–Norb) with Ti(OPr)4 or Zr(OBu)4 and were characterized by X-ray structure analyses. Ring-opening metathesis polymerization was performed w…
Drastic changes in the structure of manganese clusters are observed from a minor modification of a phosphonate ligand.
The steam reforming of hydrocarbon fuels is a promising method for the production of hydrogen for portable electrical power sources. A suitable reactor for this application, however, must be compatible with temperatures above 800 degrees C to avoid coking of the catalytic structures during the reforming process. Here,…
Electrochemical impedance spectroscopy (EIS) is a common technique used in the assessment of the thickness of anodic oxide films formed on Al and its alloys. However, it is shown here that the resistance values obtained from EIS data are highly dependent on the solution in which the measurements are made, while the ca…
Reaction of the phenoxytriamine proligands 2,4-dimethyl-6-bis(2-(diethylamino)ethyl)aminomethlyphenol (HL1) and 2,4-di-tert-butyl-6-bis(2-(diethylamino)ethyl)aminomethylphenol (HL2) with Y[N(SiMe2H)2]3(THF)2 in pentane gave the momomeric complexes L1Y[N(SiMe2H)2]2 (1) and L2Y[N(SiMe2H)2]2 (2). X-Ray structural analysi…
An alloy coating has been developed for an AA2024-T3 substrate that can serve as barrier, sacrificial anode, and reservoir to supply soluble inhibitor ions to protect any defect sites. In this paper, the chemical throwing power of such an metallic coating under thin electrolyte films representative of atmospheric cond…
Preface Processing mechanics and structure formation during SPD Physical Fundamentals Of Formation And Stabilisation of Nanostructures In Metals And Multiphase Alloys Under Severe Plastic Deformation The Limit of Grain Refinement during ECAP Deformation Modelling of Grain Boundary Structure in Nanostructured Materials…
This paper reports the study of the static and dynamic properties of single-walled boron nitride nanotubes by using the molecular structural mechanics approach. The stiffness parameters of the boron–nitride bond are based on the DREIDING force field. The effects of tube diameter and chirality are investigated. The com…
Abstract The X‐ray structures of the novel spin crossover complex [Fe(pmea)(NCS) 2 ] with pmea = (bis[(2‐pyridyl)methyl]‐2‐(2‐pyridyl)ethylamin) were determined in its low‐spin (singlet, LS) and high‐spin state (quintet, HS) and compared with the optimized geometries produced by BP86 calculations. IR and Raman (λ ex =…
The microwave-assisted cationic ring-opening polymerization of a soy-based 2-oxazoline monomer (SoyOx) was investigated. Kinetic investigations of the SoyOx polymerization in both acetonitrile and without additional solvent revealed the formation of well-defined poly(2-oxazoline)s with fatty acid side chains in a livi…
Abstract Low‐power, plasma‐enhanced (PE)CVD together with polymerization of methyl methacrylate (MMA) can be used to deposit thin films of poly(methyl methacrylate) (PMMA) with minimal loss of functional groups, as shown by Fourier transform infrared (FTIR) spectroscopy, X‐ray photoelectron spectroscopy (XPS), and Ram…
A novel "ditopic" ligand containing two monophosphinate triacetate DOTA-like units linked by a thiourea bridge has been synthesized and its complexes with Ln3+ ions (Ln = Y, Eu, Gd, Dy) investigated by NMR spectroscopy and relaxometry. The presence of one water molecule in the first coordination sphere has been determ…
This study presents novel coplanar waveguide (CPW) power splitters comprising a CPW T-junction with outputs attached to phase-adjusting circuits, i.e., the composite right/left-handed (CRLH) CPW and the conventional CPW, to achieve a constant phase difference with arbitrary value over a wide bandwidth. To demonstrate…
Two kinds of amino acids (L-cysteine and L-cystine, represented as L-CySH and L-Cys respectively) have been intercalated into MgAl layered double hydroxides by coprecipitation. The structure and composition of the intercalated materials have been characterized by X-ray diffraction (XRD) and elemental analysis. Further…
Isothermal self-sustained kinetic oscillations in CO oxidation over silica-supported Pt at near-atmospheric pressure were studied by combined in situ Fourier transform infrared spectroscopy and mass spectrometry. The use of a specially designed reactor and careful choice of the physical properties of the catalyst and…
Optical properties of generalized dielectric Fibonacci multilayer generated by the rule Sl+1 = Sn l S m l−1 with a pair of positive integers m and n were studied. The initial generations S1 and S2 are taken as S1 = H and S2 = L where H and L are two elementary layers with refractive indices nL = 1.45 and nH = 2.3, res…
The successful intercalation of a variety of organic dicarboxylates and sulfonates into the novel LDHs [MAl4(OH)12](NO3)2·yH2O (M = Zn, Cu, Ni and Co) has recently been reported [G. R. Williams, T. G. Dunbar, A. J. Beer, A. M. Fogg and D. O’Hare, J. Mater. Chem., DOI: 10.1039/b514874j, ref. , the preceeding paper in t…
Hydrothermal treatment of anodized alumina membranes has been known for years and is believed to seal the pores by transforming aluminium oxide into lower density hydroxides. We demonstrate that, at least for 60 nm diameter pores grown from anodization in oxalic acid at 40 V, the hydrothermal treatment significantly s…