Materials Literature
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An understanding of the physical and mechanical characteristics of historic mortars is of vital importance in the selection of repair mortars for historic buildings. As a result, a need has arisen for test methods that can be used to assess those characteristics in irregular, friable samples. The present paper discuss…
The present paper discusses the technical feasibility ofusing the fine fraction of recycled aggregate fromconcrete rubble to manufacture cement mortar andpossible conditions. An initial study of the chemical and physical-mechanicalcharacteristics of fines recycled from selected concreteshowed that their high absorptiv…
Carbon fiber reinforced composites (CFRC) have been used in aeronautical industry in the manufacture of different aircraft components that must attend tight mechanical requirements. This paper shows a study involving mechanical (flexural, shear, tensile and compressive tests) and morphological characterizations of fou…
This paper presents a new methodology for weld-metal properties optimization from welding flux ingredients. The methodology integrates statistical design of mixture experiment with mathematical programming optimization technique. The mixture experiment is responsible for the modeling of the weld-metal properties as a…
The electrochemical behavior of three titanium dental implants purchased on the Brazilian market was evaluated in artificial saliva using open-circuit potential measurements, electrochemical impedance spectroscopy and potentiodynamic polarization. The three implants are passive in this medium but their corrosion resis…
Poly (L-lactic acid) (PLLA) polymers are the most frequently used substrates for cell culture, tissue regeneration and orthopedic prostheses, mainly because of their atoxic characteristics and good biocompatibility. The objective of this study was to evaluate whether a higher density or different pore diameters (less…
Abstract Literature data on complex hydrides of the late transition metals (groups 7–10), such as the hydrogen storage material Mg 2 NiH 4 , are reviewed with respect to order-disorder phase transitions and structural relationships. They are analysed in terms of crystallographic group-subgroup trees and their use in u…
Graphene films have been formed by annealing Ni thin films at 800 °C under vacuum conditions. The Ni thin films are deposited on Si/SiO 2 and, following annealing, have a polycrystalline morphology with grain sizes on the order of 1 μm. Following growth, the Ni is removed by etching, and the graphene is transferred as…
Abstract The reaction mechanisms for CO catalytic oxidation by N 2 O or O 2 on the Co 3 O 4 (110) surface were studied by DFT slab calculations. CO chemisorbs preferably at a surface Co 3+ site. After the Co 3+ site is completely covered, CO adsorbs at the neighboring twofold coordinated surface oxygen atom bonded to…
The embedded atom method (EAM) is used to construct an interatomic potential for modelling interfaces in Cu – Nb nanocomposites. Implementation of the Ziegler–Biersack–Littmark (ZBL) model for short-range interatomic interactions enables studies of response to ion bombardment. Collision cascades are modelled in fcc Cu…
Hydrogen is one possible medium for energy storage and transportation in an era beyond oil. Hydrogen appears to be especially promising in connection with electricity generation in polymer electrolyte membrane (PEM) fuel cells in cars. However, before such technologies can be implemented on a larger scale, satisfactor…
Ultraviolet light irradiation (λ ex > 300 nm) to a mixed ethanol solution of cadmium perchlorate and elemental sulfur (S 8 ) under deaerated conditions has led to deposition of CdS quantum dots on the surfaces of TiO 2 particles and films (CdS/TiO 2 ). High-resolution transmission electron microscopy (HRTEM) confirmed…
Abstract As a biomaterial, cellulose can be converted into a wide range of derivatives with desired properties for a variety of medical, biomedical, and pharmaceutical applications. The oxidation of cellulose yields oxidized cellulose (OC, oxycellulose, 6‐carboxycellulose). OC represents an important class of biocompa…
A Quantum Mechanics (QM) is used for investigated the nature of metals transport and interaction with single-walled carbon nanotubes (SWCNTs) inter membranes. Metal species can be transported actively by a combination of SWCNT-membranes conducting channels that have been used for bio-molecular and detection. This stud…
Silicon and its oxides are widely used in biomaterials research, tissue engineering and drug delivery. These materials are highly biocompatible, easily surface functionalized, degrade into nontoxic silicic acid and can be processed into various forms such as micro- and nano-particles, monoliths, membranes and micromac…
The large-quantity (Grams) of graphene oxide (GO) was prepared by modified Hummers method, which the purifying process of GO suspension was much faster by filtering dried GO agglomeration dispersed into deionized water than usually used directed filter. The GO could be easily reduced to graphene.
ZnS nanoparticles were fabricated by hydrothermal method without using any capping agent. The hydrothermal temperature was 220°C. The product was received in powder form. The structure, composition and optical property of the resultant product were characterized by means of X-ray diffraction (XRD), transmission electr…
We report the assembly of low-fouling polymer capsules with engineered deconstruction properties by using a combination of layer-by-layer (LbL) assembly and click chemistry. Preformed, hydrogen-bonded multilayers of alkyne-functionalized poly(N-vinyl pyrrolidone) (PVPON(Alk)) and poly(methacrylic acid) (PMA) assembled…
Bulk ceramics In2−xMxO3, with a metal-like behavior, have been synthesized in air for M=Ti4+, Zr4+, Sn4+, Ta5+, and Nb5+, with rather low solubility limits xℓ, ranging from 0.01 to 0.1. An abrupt increase in the electrical conductivity and of the carrier concentration with x is observed in the monophasic region (x&…