Materials Literature
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Se nanowires were grown in a confined geometry of polymer thin films by adjusting the coordination strength between the polymer chains and Se atoms, and they were in situ aligned during the reaction in a patterned substrate.
We report a facile one‐step approach which involves no flammable gas, no catalyst, and no in situ polymerization for the preparation of well‐aligned carbon nanotube array. A polymer precursor is placed on top of an anodized aluminum oxide (AAO) membrane containing regular nanopore arrays, and slow heating under Ar flo…
X-ray Photoelectron Spectroscopy was conducted on magnetron sputtered WO3 thin films, following a sequence of ultra high vacuum anneals from 100°C to 900°C. Annealing from 100°C to 400°C induced an upward surface band bending of about 0.3 eV, attributed to the oxygen migration from the bulk to the surface, but no chan…
Zinc oxide powders of different Al doping contents (AZO) were prepared with the coprecipitation method from zinc nitrate solution and aluminum nitrate solution in this study. The effects of process parameters such as the Al doping content, calcination temperature and calcination time etc. on electric conductivity were…
Poly(ethylene glycol) (PEG, 6 kg mol−1) terminated at both ends by a hydrophobic fluoroalkyl segment [-(CH2)2C10F21] (Rf-PEG) has been shown to self-assemble into an essentially water insoluble hydrogel. Here, we characterize the monolayer, formed by Rf-PEG and the subsequent adsorption of a protein, as a function of…
Last few decades theoretical/computational studies of structure, function and reactivity of molecules have been contributing significantly in chemistry by explanation of experimental results, better understanding of underlying principles and prediction of the unknown experimental outcome. Accuracy needed in chemistry…
Improving the water sensitivity of polyvinyl acetate PVAc films as well as pressure sensitivity, adhesion and washability of polybutyl acrylate were achieved by using bis (2-ethylhexyl) maleate (BEHM). The emulsion polymerization kinetics of vinyl acetate and butyl acrylate in presence of BEHM was studied. The order o…
The tptz molecule is reduced by potassium into its anion-radical in the compound K(tptz)(2) (), whereas it is reductively coupled by SmI(2) and UI(3)(py)(4) into the bis-triazinide ligand in the dinuclear complexes [Sm(2)(tptz-tptz)(DMF)(8)][I](4).3.5DMF (.3.5DMF) and U(2)I(6)(tptz-tptz)(MeCN)(2).2MeCN (.2MeCN) where…
O uso do pó de pneu em misturas com termoplásticos possibilita a formação de novos materiais. Nesse trabalho o uso do pó de pneu foi caracterizado pelo planejamento fatorial completo 2³, com ponto central, em misturas com polipropileno (PP), para desenvolvimento de novos elastômeros termoplásticos vulcanizados dinamic…
Abstract In a previous paper, we described the adaptation of the generalized hybrid orbital (GHO) method for the use in fragment based quantum chemical approaches for large molecules like the field‐adapted adjustable density matrix assembler (FA‐ADMA). It soon became evident that the limitations of the available imple…
Carbon nanotube (CNT) has excellent lightweight properties, mechanical properties and electric conductivity, and therefore CNT is expected as the next generation conductive wires for the electric devices or as wire harnesses for the motor vehicles etc. However, the CNT is very small materials, for instance usually the…
Ti-Ag alloys with 20 and 25 mass% Ag were prepared; their surfaces were polished using silicon carbide abrasive papers. The polished alloys were immersed in a simulated body fluid (SBF), and their surfaces were observed by scanning electron microscope (SEM) to investigate the spontaneous formation of calcium phosphate…
Previous research at the Cavendish Laboratory has shown a change in failure mechanism, from that of intergranular to transgranular failure, when PBX Brazilian disc specimens are tested below the glass transition condition of their binder system. The current study builds on this earlier research, illustrating how the s…
This article presents the fabrication of shape-controllable crystalline nickel hydrazine complex structures via a simple sonochemical route. The morphologies of the nickel complex particles are self-organized into hexagonal plate-like and disk-like morphologies depending on the reaction conditions. A possible evolutio…
We report that gold nanoparticles were synthe-sized by reduction of HAuCl4 using halloysites. The synthe-sized samples were analyzed by a transmission electron microscope. The results show that the gold nanoparticles have strip-like, subcircle, and irregular shape, which are single crystals or polycrystals. Their shap…
In present paper, boronizing was applied to N80 steel tube by pack boronizing, and its effect on mechanical properties, wear and corrosion of N80 tube steel was investigated. A dual-phase boride layer composed of FeB and F2B phases was formed on the surface of the steel substrate in a hardness range of 1220–1340 HV. A…
Bismuth telluride nanowires were electrodeposited from aqueous acidic solutions containing different (20/20 and 20/10 mM) concentration ratios. The polarization plots predicted that combined solutions exhibit more noble reduction potentials than individual solutions. Optimized deposition potentials were obtained from…
In this paper, the molecular structure of a 1,8-naphthalimide fluorophore modified sextuple H-bond self-assembly homodimer, comprising two linear oligoamide molecular strands bearing arrays on one edge with complementary hydrogen bond sequences of DDADAA and AADADD, is characterized via1H NMR, ESI-MS, 13C NMR, and ele…
Two heterobimetallic precursors [Zn(TFA)3(micro-OH)Cu3(dmae)3Cl].THF (1) and [Zn(TFA)4Cu3(dmae)4] (2) [dmae=N,N-dimethylaminoethanolate and TFA=trifluoroacetate], have been synthesized and characterized by their melting points, elemental analysis, FT-IR spectroscopy, mass spectrometry, TGA and single crystal X-ray dif…
This study investigates the cold-rolling effect on the formation of Ti(Ni,Cu)2 precipitates and on the change of transformation temperatures for hot-rolled (HR)/annealed (HRA) and HR/cold-rolled/annealed (CRA) Ti50Ni40Cu10 specimens. Particle-like Ti(Ni,Cu)2 precipitates formed in CRA are more numerous and smaller tha…