Materials Literature
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Abstract This paper is in four parts. The first is related to general considerations and experimental analyses, and each of the others is related to different approaches to the theoretical analyses of the mechanical behaviour of weft-knitted fabrics and weft-knitted reinforced composites made of glass fibre. The objec…
This part of the series deals with the measurement of fiber damage caused by needle punching. A critical step in the experimental determination of fiber damage is to unravel fibers from needled nonwoven fabrics. This is achieved by using a feed web containing water-soluble fibers and a small percentage of wool. After…
The effect of pentagonal defects on the electronic structure at the tip of carbon nanohorns is investigated within the continuum gauge field-theory model. It is found that the existence of a localized electron state at the Fermi level (a true zero-mode state) results in enhanced charge density near the tip. Using a se…
The purpose of this study was to evaluate the thermal endurance of two types of thermal control foils. This is an important parameter for selecting materials for inner solar system missions. Assessing the thermal endurance by isothermal testing in a thermogravimetric analyser (TGA) is a time-consuming method. A quicke…
A multiple-interference model to describe double-grating waveguide structures is presented. It is based on the multiple-interference model for single-grating waveguide structures previously established by Friesem and co-workers [J. Opt. Soc. Am. A 14, 2985 (1997)]. We show that double grating waveguide structures, in…
Hertzian indentation technique was used to measure surface flaw sizes on polished dense polycrystalline alumina specimens with grain sizes G = 1.2, 3.8 and 14.1 µm. Two surfaces finishes were studied: well-polished (Syton) and coarse-polished (45 µm diamond paste). Flaw sizes depended on the surface finish and increas…
The crystal structure of several compounds of Ca 1−x Sr x Zr 4 (PO 4 ) 6 ceramics has been investigated by X-ray powder diffraction at room temperature. All compounds form a solid solution with a unique unit cell. While the lattice parameter a of the hexagonal unit cell decreases of about 0.9% with increasing Sr conte…
Lead magnesium niobium titanate (PMNT) thin films with a composition near the morphotropic phase boundary were prepared on conventional Pt(111)/Ti/SiO 2 /Si substrates using a modified sol‐gel process. A PbO seeding layer was introduced to the interface between the PMNT layer and the substrate to enhance the [001]‐pre…
Abstract Soybean oil/epoxy‐based composites were prepared by an extrusion freeform fabrication method. These composites were reinforced with a combination of organically modified clay and fibers. The intercalated behavior of the epoxy resin in the presence of organo‐modified clay was investigated by X‐ray diffraction…
Abstract The mechanism of adhesion at semicrystalline polymer interfaces between isotactic polypropylene (iPP) and linear low‐density polyethylene (PE) was studied with transmission electron microscopy (TEM) and an asymmetric‐double‐cantilever‐beam test. From the TEM images, both the interfacial width and the lamellar…
Duas séries de copolímeros triblocos, poli (ácido lático-b-etileno glicol) (PLA-PEO-PLA), foram sintetizados a partir do éster cíclico l,l-lactideo, usando octoato de estanho como iniciador e poli (etileno glicol) (PEG) (Mn = 4000 ou 600), di-hidróxi terminado, como co-iniciador. A ligação química entre os segmentos P…
YMnO 3 thin films have been modified by Bi for low-temperature processing. YMnO3 thin-film growth typically requires high temperatures possibly leading to undesirable interface reaction and device failure in further processing. We have proposed Bi modification into YMnO3 (YBM) thin films grown on Si (100) by pulsed-la…
In Brief Gene therapy is a promising modality for the treatment of soft tissue malignancies. Our laboratory has developed a novel technique of gene transfer using microvascular free flaps that addresses many of the current barriers preventing gene therapy from achieving widespread clinical use. Our previous work has d…
In this study, the bio-reduction of Au(III) to Au(0) by wheat biomass and the subsequent production of gold nanoparticles of various shapes and sizes is presented. The dry biomass was ground and sieved in order to assure a uniform particle size and having more area of biomass exposed to the gold. Wheat biomass was exp…
Abstract A microtexture analysis by TEM and AFM of palygorskite deposits from the Hawthorne Formation, southern Georgia is given. Palygorskite is the dominant mineral comprising an average of 65–70% of the sample volume with smaller volumes of smectite, illite and kaolinite. Morphologic observations indicate that the…
The thermoelectric properties of layer-structured homologous compounds of (ZnO) m In 2 O 3 ( m is an integer) were investigated in terms of the detailed dependence of the molar ratio of ZnO to In 2 O 3 , n (=ZnO/In 2 O 3 ), and of doping, such as with Ba 2+ , Ca 2+ , Sr 2+ , and Sn 4+ , for an In site. Except for the…
Methyl methacrylate (MMA) emulsion polymerization in the presence of nanometer calcium carbonate(nano-CaCO3) surface modified with γ-methacryloxypropyltrimethoxysilane (MPTMS) was carried out to prepare poly (methyl methacrylate) (PMMA)/nano-CaCO3 composite. The reaction between nano-CaCO3 and MPTMS, and the grafting…
Abstract The structure and dynamics of the surfactant layer in organoclays prepared from synthetic clays (Laponites, expandable fluoromica) and in their composites with polystyrene are studied in order to understand the influence of the interface layer on composite properties and composite formation from melt or solut…
Earlier works showed that the use of electron beam melting is a viable process to produce NiTi shape memory alloy. In those works a static and a semi-dynamic processes were used producing small shell-shaped and cylindrical ingots respectively. The main characteristics of those samples were low carbon concentration and…
This paper is devoted to the evaluation of the corrosion behavior of Alloy 800 (UNS N08800) when exposed to 80 mol% Na2SO4-20V2O5 (80 mol% sodium sulfate-20vanadium pentoxide; high sulfate) and 80 mol% V2O5-20Na2SO4 (high vanadate) at 700°C and 900°C. Applying electrochemical techniques, namely potentiodynamic polariz…