Materials Literature
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In this work, we have investigated the benefit of combining the grafting of chemical function to improve the solubility and the dispersion in an organic matrix with the opportunity of grafting fireproofing chemicals (melamine-based compound) on multiwall carbon nanotube (MWNT). The functionalized MWNT (f-MWNT) is inco…
Abstract The effects of varying amounts of organically modified nanoclay (NC), calcium stearate (Ca.St.), stearic acid (St.Ac.), and an impact modifier (IM) on the fusion characteristics of a rigid Poly(vinyl chloride) (PVC) nanocompound were investigated by using the L9 orthogonal method of experimental design. The m…
Tetragonal tungsten bronze-structured materials based on lead metaniobate (PbNb2O6) were studied in terms of thermal dynamics of dielectric properties, showing ferroelectric-to-paraelectric phase transition of diffuse and relaxor type in some specific cases. These features are normally ascribed to defects-induced stru…
A decade of research and development concerning polymer nanocomposites has shown the essential features of their combustion process. Nanocomposites actually display a fire retardant behavior because they avoid fire propagation by dripping of hot and flaming polymer particles and reduce the rate of combustion. The mech…
Abstract This article describes the production of microfiber nonwoven fabrics from segment pie bi‐component fibers using air‐laying and hydro‐entanglement. The bi‐component fibers were split into microfibers during hydro‐entanglement. The microfiber nonwoven fabrics are compared with similar products made from single…
We have performed neutron diffraction experiments on highly oriented α-Al 2 O 3 , obtained by slip casting under a magnetic field and sintering. In order to investigate the magnetic field, B , and sintering temperature, T sint , dependence of the degree of alignment of the orientation, we used samples treated with sys…
Nanodispersion of single-walled carbon nanotubes (SWCNTs) have been systematically investigated with the use of sodium dodecyl sulfate (SDS) and poly(vinylpyrrolidone) (PVP) surfactant in deionized water. A high concentration of nanodispersed SWCNTs up to 0.08 mg/mL was achieved with introduction of an additional disp…
Abstract Nanostructured terbium orthophosphate (TbPO 4 · H 2 O) nanostructures with enhanced photoluminescence were prepared through a controlled, simple, and template‐free hydrothermal route. The structures and micromorphologies of the as‐synthesized TbPO 4 · H 2 O were investigated by X‐ray powder diffraction (XRD),…
CuO and ZnO nanosheets were conveniently synthesized on a multigram scale under ambient conditions by using a surfactant lamellar mesophase as a soft template. The fabricated nanosheets were found to exhibit reversible self-assembling properties. By using the nanosheets as a basic building block and surfactants as str…
Abstract A sodium bentonite (montmorillonite‐based layered silicate clay) was organically modified with cetyl trimethyl ammonium bromide (cetrimide), using different clay/water ratios—but the same clay/cetrimide ratio—to suspend the bentonite clay and perform its organophilization. Infrared spectroscopy and thermograv…
Abstract A novel process using ultrasonic irradiation to enhance nanosilica dispersion in polypropylene‐based nanocomposites has been proposed and investigated. The nanocomposites were isotactic polypropylene reinforced with silica nanoparticles at 3 wt% loading level. Ultrasonic processing in the melt state is an eff…
Abstract Two samples of high‐density polyethylene with different molecular weight were processed in a batch mixer and the rheological and structural properties were investigated. In particular, the effect of different processing parameters and the eventual presence of different stabilizers were evaluated. Actually, tw…
On the mechanism of enhancement on electron field emission properties for ultrananocrystalline diamond films due to ion implantation, Joseph, P T, Tai, N H, Chen, C H, Niu, H, Cheng, H F, Pong, W F, Lin, I N
We study the diffusive behavior of two-dimensional charged colloidal suspensions subjected to a sinusoidal substrate by means of Brownian dynamics simulations. We mainly focus on the dependence of the mean-square displacement on the substrate strength. Our findings show a variation in the particle diffusion due to a s…
Crystal structures and electron-density distributions of ceria-zirconia CexZr1−xO2 compounds have been studied by the maximum-entropy method (MEM) and MEM-based pattern fitting combined with the Rietveld method using high-angular-resolution synchrotron x-ray powder diffraction data. The isotropic atomic displacement p…
The aggregation of the negatively charged complexes of hyperbranched poly(ethylenimine) (PEI) and sodium dodecyl sulfate (SDS) has been investigated at different sodium chloride (NaCl) concentrations using coagulation kinetics, electrophoretic mobility and dynamic light scattering measurements. The observed variation…
Hybrid materials of polymers and cadmium selenide nanocrystals (CdSe-NCs) were produced through a layer-by-layer deposition technique. Polymer series comprises sulfonic, phosphonic, and carboxylic acids; pyridine- and amine-based polymers; and some related bipolar amphiphiles, including a dithiol. Nonaqueous dispersio…
Abstract Catalytic activity during the formation of polyethylene (PE)/clay nanocomposites by in situ polymerization with metallocenes was studied. Ethylene polymerization was carried out with the homogeneous metallocene in the presence of the clay particles and using the clay‐supported metallocene catalyst. It was fou…
We have deposited nearly stress-free single-crystal thin films of (001) Pb(Mn,Nb)O3–Pb(Zr,Ti)O3 (PMnN-PZT) on (001)MgO substrates by rf-magnetron sputtering using a quenching process after the film growth. It is found that single c-domain/single-crystal thin films of PMnN-PZT containing 5%–10% PMnN show a strong hard…
Rare-earth niobates and tantalates are functional materials that are exploited as photocatalysts, host lattices for phosphors, and ion conductors. These phases are extremely challenging to synthesize by methods other than solid-state processing, which limits expansion of this useful class of materials. Hydrothermal pr…