Materials Literature
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A pretreatment method for copper foil substrates for graphene synthesis with microwave plasma has been developed using a helium and hydrogen gas mixture. Contaminants on the surface of the substrate, particularly copper oxides, were effectively removed by this method, which was confirmed by X-ray photoelectron spectro…
ABSTRACT A diamine containing pyridine ring, amide, and ether groups was prepared via two‐step reactions from 6‐chloronicotinoyl chloride. A novel polyimide was prepared from polycondensation of pyromellitic dianhydride with the diamine. In addition, nanoporous polyimide films were prepared from graft copolyimides. A…
The authors synthesized a Cu–Al alloy by employing alternating atomic layer deposition (ALD) surface reactions using Cu and Al precursors, respectively. By alternating between these two ALD surface chemistries, the authors fabricated ALD Cu–Al alloy. Cu was deposited using bis(1-dimethylamino-2-methyl-2-butoxy) copper…
Here we discuss the possibility of modulating energy gaps of graphene nanoribbon bilayers, with zigzag edges, by applying electric fields. The system is disposed in the Bernal configuration and is described by a Hubbard Hamiltonian. We follow a Hartree-Fock mean-field theory to calculate the electronic properties of t…
Pb-free ferroelectric <TEX>$(Na_{0.5}Bi_{0.5})TiO_3$</TEX> (NBT) thin films were prepared by a modified sol-gel process. Their structural, dielectric and pyroelectric properties were investigated as a function of the excess Na/Bi ratio and the annealing temperature. In the case of thin films containing no excess Na an…
Europium‐doping sodium–aluminosilicate glasses are prepared by melt‐quenching method, in which europium ions were spontaneously reduced from their trivalent to divalent state. The silver was introduced into glasses by Ag + – Na + ion exchange and the interactions between europium ions and silver species were investiga…
Liquid crystal aromatic esters of compositions C10H21OC6H4C(O)OC6H4OC4H9 (1) and C10H21OC6H4C(O)OC6H4OC6H13 (2) have been investigated by X-ray structural analysis. On temperature rise, these compounds undergo phase transitions crystal-smectic (SA)-nematic-isotropic (1) and crystal-smectic (SC)-smectic(SA)-nematic-iso…
In an effort to develop biopolymer-based antioxidant and antibacterial materials, a chitosan-phloroglucinol conjugate was prepared and cellular antioxidant activity and minimum inhibitory concentration against foodborne pathogens and methicillin-resistant Staphylococcus aureus (MRSA) evaluated. The chitosan-phlorogluc…
This research is to investigate the morphological and mechanical properties of thermoplastic vulcanizates, polypropylene/epoxidized natural rubber (PP/ENR) when treated with maleic anhydride-grafted polypropylene (Mah-PP). The PP/ENR thermoplastic vulcanizate was prepared using a two-stage melt compounding method usin…
Abstract Constrained groove pressing (CGP) is a new severe plastic deformation method suitable for producing ultra‐fine grained sheet metals. In this work, the processing efficiency for a muti‐pass CGP of pure copper was investigated. With a relatively small groove width of 2 mm and tight constraint, a sharp variation…
Diatom indices have been used and tested mainly for assessing the ecological status of rivers and deep lakes, but there are scarce studies that determine their effectiveness in shallow lakes and in coastal Mediterranean lakes. This study evaluates the validity of several common diatom indices (SPI, BDI, CEC and TDIL)…
Abstract Porous carbon fiber with hollow structure and hydrophilic groups was successfully prepared from cotton. The structures and surface chemical properties of the porous carbon fiber were characterized by nitrogen adsorption isotherms, thermogravimetry, FTIR spectroscopy, and scanning electron microscopy. The morp…
The combination of polydentate aminated ligands with the 2-pyridyloxime-nickel-azide system leads to series of clusters with unprecedented topologies. Among them, a remarkable family of {Ni9} metallacycles that are capable of selective encapsulation of azide/halide anions in a cryptand-like cavity through hydrogen-bon…
In order to gain insight into the magnetic behaviour of Ni-doped ZnO nanocrystals (NCs) the local structure was rigorously studied by extended x-ray absorption fine structure (EXAFS) along with the magnetic measurements. At low doping level of Ni, local structure remains identical to ZnO NCs with subtle increase in th…
In last decade, more research has been conducted in order to find the better way for utilizing the wastes product generated from food processing industries. The increasing demand of industrial by-products is one of the main reasons for the conversion of these wastes into valuable products. Among the different valuable…
The synthesis, structure, and photophysical properties of novel BODIPY-Fischer alkoxy-, thio-, and aminocarbene dyads are reported. The BODIPY chromophore is directly attached to the carbene ligand by an ethylenic spacer, thus forming donor-bridge-acceptor π-extended systems. The extension of the π-conjugation is deci…
Abstract In the present study, artificial neural network (ANN) approach was used to predict the stress–strain curve of near beta titanium alloy as a function of volume fractions of α and β. This approach is to develop the best possible combination or neural network (NN) to predict the stress–strain curve. In order to…
A new method for assessing the similarity of material compositions is described. A similarity measure is important for the classification and clustering of compositions. The similarity of the material compositions is calculated utilizing a data-mined ionic substitutional similarity based upon the probability with whic…
In this article, a new higher order shear deformation theory based on trigonometric shear deformation theory is developed. In order to consider the size effects, the nonlocal elasticity theory is used. An analytical method is adopted to solve the governing equations for static analysis of simply supported nanoplates.…
The increasing technological importance of thin insulating layers calls for a thorough understanding of their structure. Here we apply scanning probe methods to investigate the structure of ultrathin magnesium oxide (MgO) which is the insulating material of choice in spintronic applications. A combination of force and…