Materials Literature
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Unstrained carbon-carbon single bonds are ubiquitous in organic compounds, the cleavage of this bond is one of the most significant and challenging subject in organic chemistry. Oxidative cleavage of unstrained carbon-carbon single bond has become a great tendency, in particular, the transition metal-catalyzed oxidati…
In this paper we introduce and apply the method for determination of the glass transition temperature of the sub-100 nm thick freestanding and supported polymer films based on thermally assisted atomic force microscopy (AFM). In proposed approach changes of the phase of an oscillating AFM cantilever are used to determ…
In this study, we fabricated E-glass fibers and alkali-resistant (AR)-glass fibers with a 7 mass% zirconia content, and AR-glass fibers with a 7 mass% zirconia and 30–50 mass% refused coal ore content. The obtained fibers were characterized for their tensile strength and alkali-resistant properties after dipping the f…
Rare earth ions-doped hexagonal β-Na(Y,Yb)F 4 nanorods can be coated perfectly with either optically active or inert shells to improve and/or tailor the upconversion emission through a one-step epitaxial growth method from α-phased nanoparticles.
The translocation of a polymer chain through a crowded cylindrical channel is studied using the Langevin dynamics simulations. The influences of the field strength F , the chain length N , and the crowding extent ρ on the translocation time are evaluated, respectively. Scaling relation τ~F-α is observed. With the crow…
Thermal protective garment has been deemed as an important shielding against fire hazard and inflammable gas leakage. The coupling model of thermal protective garment, air-gap, and human body has been widely established, but the heat transfer in air-gap was commonly simplified, resulting in inaccurate results. This pa…
This article will discuss some of the general considerations on the complexity of Nanotoxicology (NT). The real scope of Nanotoxicology involves many processes. Nanotoxicology is an emerging discipline evolving from studies of ultrafine particles called the nano-particles (NP). The small size facilitates uptake into c…
The Fo-a subunit of the Na+-transporting FoF1 ATP synthase from Propionigenium modestum plays a key role in Na+ transport. It forms half channels that allow Na+ to enter and leave the buried carboxyl group on Fo-c subunits. The essential Arg residue R226, which faces the carboxyl group of Fo-c subunits in the middle o…
Activated carbons (ACs) were prepared from a lignocellulosic-based waste material by a chemical impregnation method using KOH, NaOH or CaCl2 as the activating agent. These ACs were characterized by different techniques such as N2 adsorption, FTIR, XRD and SEM. Electrostatic properties viz. pH and pHpzc of AC suspensio…
In this paper, loofah was used as raw material and alkali and hydrogen peroxide were used to pre-oxidize. The activated carbon was activated by zinc chloride, and the activated carbon was used to desorb the heavy metal ions nickel and copper. The removal efficiency of heavy metal ions was studied under different condi…
In this work, lead dioxide coatings deposited from nitrate electrolytes containing nickel ions as an additive are investigated. It is shown that lead dioxide electrodes micromodified with nickel are formed upon the deposition that differ from conventional PbO 2 anodes in their physicochemical properties. It is establi…
AgNHPs was purified with membrane separation-centrifugation cleaning and syntheses the GE–AgNHPs with the low resistivity (2.5 × 10 −6 Ω cm) at low temperatures.
In order to study the igniton properties of the silicon ignitior, firing sensitivity test with output charge B-KNO3 were carried out, and the igniton properties was studied as well. The result indicates that the energetic chip can ignite B-KNO3 which burns sufficiently. The 50% firing voltage was 21.3V, standard devia…
Electrochromism with the ring-closing or ring-opening isomerization of substituted and unsubstituted bis(3-thienyl)/(2-thienyl)hexafluorocyclopentene is discussed using the DFT method. In the neutral ground state, bond making and breaking between two reactive C atoms on thienyls are thermodynamically forbidden. Under…
Cu3BiS3 nanoparticles were successfully synthesised by hydrothermal and solvothermal methods using L-cysteine biomolecules as a sulphur source and complexing agent. Phase and purity of the samples were characterised by X-ray diffraction (XRD) and selected area electron diffraction (SAED). Scanning and transmission ele…
The natural fibers are used in engineering purpose to make fabrics, ropes, bags etc. They are also used in making hybrid composites and natural composites. The strength of composite depends on the strength of natural fibers. The fracture behaviour of natural fibers is important to study so that the desired composite l…
Formation damage produced by inorganic scaling is the most frequently and has the major impact on the Colombian oil fields. It causes important economic losses due to flow restrictions, workover operations and production losses. Therefore it is necessary the implementation of inhibition techniques to prevent scaling.…
In this paper, optimal control problems governed by diffusion equations with Dirichlet and Neumann boundary conditions are investigated in the framework of the gradient discretization method. Gradient schemes are defined for the optimality system of the control problem. Error estimates for state, adjoint, and control…
This paper deals with the numerical modelling strategy for square thin–walled column subjected to axial impact loading. The behavior of the column was found to be affected by the way the column is manufactured, i.e. formed metal sheet or extruded. For formed metal sheet structure a comparison between numerical simulat…
Defects in a black Au film were studied using variable energy positron annihilation spectroscopy. Black Au films exhibit porous morphology similar to cauliflower. This type of structure enhances the optical absorption due to a multiple reflections in the micro-cavities. A nanostructured black Au film was compared with…