  Dispersion of multiwalled carbon nanotubes in water by lignin; ; et al in Journal of Materials Science (2013), 48(14), 4962-4964 Multiwalled carbon nanotubes (MWCNT) can be stably dispersed in water with small amount of lignin. One-step dispersion in the 20.0 g/L concentration range is achieved at room temperature with excellent ... [more ▼] Multiwalled carbon nanotubes (MWCNT) can be stably dispersed in water with small amount of lignin. One-step dispersion in the 20.0 g/L concentration range is achieved at room temperature with excellent electrical properties of MWCNT. Lignin is depicted to act as an anti-static agent. [less ▲] Detailed reference viewed: 43 (22 ULg)Multiscale modeling of back-stress evolution in equal-channel angular pressing: from one pass to multiple passes; Duchene, Laurent  ; Habraken, Anne et alin Journal of Materials Science (2010), 45(17), 4696-4704 Fine-grained materials produced by equalchannel angular pressing (ECAP) exhibit kinematic hardening due to the existence of a back-stress. This article presents a new dislocation-based model, which is ... [more ▼] Fine-grained materials produced by equalchannel angular pressing (ECAP) exhibit kinematic hardening due to the existence of a back-stress. This article presents a new dislocation-based model, which is able to describe the tension/compression asymmetry of the ECAP processed commercial purity aluminum. By introducing strain relaxation, and relating the back-stress to the inhomogeneous dislocation density distribution in cell walls and in cell interiors, the model can accurately predict the evolution of the dislocation densities, the cell size, and the back-stress. Compared to the other back-stress models, it takes into account the microstructure evolution and gives a better prediction. [less ▲] Detailed reference viewed: 19 (9 ULg) Close-packed array of gold nanoparticles and Sum Frequency Generation spectroscopy in total internal reflection: A platform for studying biomolecules and biosensors; Dreesen, Laurent ; et alin Journal of Materials Science (2009), 44(24), 6805-6810 An approach is introduced for studying the adsorption and recognition mechanisms of biomolecules, without using any markers. We show for the first time, that the Sum Frequency Generation spectroscopy ... [more ▼] An approach is introduced for studying the adsorption and recognition mechanisms of biomolecules, without using any markers. We show for the first time, that the Sum Frequency Generation spectroscopy performed in the Total Internal Reflection (TIR-SFG) geometry, combined with a regular close-packed array of gold nanoparticles allows to probe with a high sensitivity the changes in conformation and orientation induced by the recognition process of avidin by biocytin. This approach represents a new platform with potential use in biosensors, diagnostics and bioactive layers. [less ▲] Detailed reference viewed: 22 (4 ULg)Electrochemical characterization of Pt/carbon xerogel and Pt/carbon aerogel catalysts - first insights into the influence of the carbon texture on the Pt nanoparticles morphology and catalytic activityJob, Nathalie ; ; et alin Journal of Materials Science (2009), 44 Detailed reference viewed: 12 (4 ULg)Studying chemical activation in carbon xerogels; ; et al in Journal of Materials Science (2009), 44 Detailed reference viewed: 5 (0 ULg) Poly(D,L-lactide) (PDLLA) foams with TiO2 nanoparticles and PDLLA/TiO2-Bioglass (R) foam composites for tissue engineering scaffolds; ; et al in Journal of Materials Science (2006), 41(13), 3999-4008 Porous poly(D,L-lactide) PDLLA foams containing 0, 5 and 20 wt% of TiO2 nanoparticles were fabricated and characterised. The addition of Bioglassg particles was also studied in a composite containing 5 wt ... [more ▼] Porous poly(D,L-lactide) PDLLA foams containing 0, 5 and 20 wt% of TiO2 nanoparticles were fabricated and characterised. The addition of Bioglassg particles was also studied in a composite containing 5 wt% of Bioglass(R) particles and 20 wt% of TiO2 nanoparticles. The microstructure of the four different foam types was characterised using scanning electron microscopy (SEM) and their mechanical properties assessed by quasi-static compression testing. The in vitro behaviour of the foams was studied in simulated body fluid (SBF) at three different time points: 3, 21 and 28 days. The degradation of the samples was characterised quantitatively by measuring the water absorption and weight loss as a function of immersion time in SBE The bioactivity of the foams was characterised by observing hydroxyapatite (HA) formation after 21 days of immersion in SBF using SEM and confirmed with X-ray diffraction (XRD) analysis. It was found that the amount of HA was dependent on the distribution of TiO2 nanoparticles and on the presence of Bioglassg in the foam samples. (c) 2006 Springer Science + Business Media, Inc. [less ▲] Detailed reference viewed: 82 (5 ULg)Preparation of YBa2Cu3O7-x superconducting thick films by the electrophoretic deposition method; Denis, Samuel ; Vanderbemden, Philippe et alin Journal of Materials Science (2006), 41(24), 8109-8114 YBa2Cu3O7-x thick films have been realised by the Electrophoretic Deposition method (EPD). The influence of several parameters (powder and iodine concentrations in the suspension, applied voltage and ... [more ▼] YBa2Cu3O7-x thick films have been realised by the Electrophoretic Deposition method (EPD). The influence of several parameters (powder and iodine concentrations in the suspension, applied voltage and deposition time) on the EPD process has been studied by measuring the conductivity of the suspension and the amount of YBa2Cu3O7-x particles deposited on the electrode. Superconducting coatings onto silver substrates have been produced by a multilayer process during different deposition times. The highest critical current density value of these coatings measured by the four-point probe method is about 10^3 A/cm^2 (77 K), in a suitable range for magnetic shielding applications. [less ▲] Detailed reference viewed: 35 (11 ULg)Characterisation of aqueous suspensions of fumed aluminium oxide in presence of two Dolapix dispersantsGaydardzhiev, Stoyan ; in Journal of Materials Science (2006), 41 The stability of a fumed aluminium oxide nano powder suspended in water has been assessed through measurement of zeta potential and streaming current, using the fact that the particles exhibit maximum ... [more ▼] The stability of a fumed aluminium oxide nano powder suspended in water has been assessed through measurement of zeta potential and streaming current, using the fact that the particles exhibit maximum repulsion at high magnitude of charge. Two commercial dispersants belonging to a Dolapix series have been tested. Dolapix CE 64 has shown a better deflocculating action than Dolapix A 88. The iso electric point of the powder suspension has been found close to pH 9. A notable shift in the pH of iso electric point when Dolapix CE 64 was present, indicating that the interaction between particles and dispersant has involved chemical sorption. It has been found out, that at the relative low solids loading studied and within the limits of the pH measurement accuracy, a dispersant supplied in dose levels from 12 to 24 mg/g, has confined the pHiep to a relatively narrow range. A capillary suction time technique has been tried for evaluation of suspension fluidity as function of dispersant concentration and pH. For the dispersant stabilised suspensions, a correlation between their CST and pHiep has been documented [less ▲] Detailed reference viewed: 321 (10 ULg)The nonlinear optical, magnetic, and Mossbauer spectral properties of some iron(III) doped silica xerogels; Rosso, Vanessa ; Renotte, Yvon et alin Journal of Materials Science (2006), 41(10), 2839-2849 Iron(III) species dispersed in silica have been synthesized with a sol-gel process. The iron(III) was introduced as the acetylacetonate complex into a solution of tetraethoxysilane to yield, after ... [more ▼] Iron(III) species dispersed in silica have been synthesized with a sol-gel process. The iron(III) was introduced as the acetylacetonate complex into a solution of tetraethoxysilane to yield, after evaporative drying, pellets or monoliths. Two gels were dried very slowly over a period of five months in order to prepare a defect free monolith useful for nonlinear optical studies. Z-scan experimental studies on the resulting, transparent, monolithic, doped solid revealed an optical Kerr effect, a third order nonlinear optical phenomenon showing a linear dependence of the refractive index on the irradiance with a nonlinear refractive index, n(2), of -1.95 x 10(-11) cm(2)/W. Magnetic susceptibility studies between 4.2 and 295 K revealed paramagnetic behavior with a Curie constant of 4.433 (emu/mol)K and a Weiss temperature of -7.1 K. Magnetization studies at 5 K and at applied fields of up to 4 T and Mossbauer spectral studies between 4.2 and 295 K revealed a 50:50 mixture of paramagnetic species and nanoparticles with an average particle radius of 1.3 +/- 0.2 nm. A blocking temperature of 70 K and a magnetic anisotropy energy of 2.4 x 10(5) J/m(3) stop are derived from the Mossbauer spectra. (c) 2006 Springer Science + Business Media, Inc. [less ▲] Detailed reference viewed: 52 (10 ULg)Low-field magnetoresistance in La0.7Ca0.3MnO3 manganite compounds prepared by the spray drying techniqueVertruyen, Bénédicte ; Rulmont, André ; Cloots, Rudi et alin Journal of Materials Science (2005), 40(1), 117-122 Calcium-substituted lanthanum manganite compounds were synthesized by the spray drying technique. This method - whose main advantages are versatility, high reproducibility and scalability - yields small ... [more ▼] Calcium-substituted lanthanum manganite compounds were synthesized by the spray drying technique. This method - whose main advantages are versatility, high reproducibility and scalability - yields small grain materials of high homogeneity and displaying low-field magnetoresistance effects. We report about the physical and chemical characterizations of these samples in order to investigate the potential interest of spray drying for the production of materials for low-field magnetoresistance applications. We have studied the dependence of the low-field magnetoresistance on the temperature and duration of the thermal treatment applied to the pelletized powders. The issue of the shape anisotropy (demagnetisation effects) influence on the magnetoresistance properties has also been dealt with. (C) 2005 Springer Science + Business Media, Inc. [less ▲] Detailed reference viewed: 40 (5 ULg)Quantitative dilatometric analysis of intercritical annealing in a low-silicon TRIP steel; ; et al in Journal of Materials Science (2002), 37 In this work, an evaluation method to calculate the austenite fraction during continuous heating and isothermal annealing from dilatometric data is proposed. By means of a single reference measurement to ... [more ▼] In this work, an evaluation method to calculate the austenite fraction during continuous heating and isothermal annealing from dilatometric data is proposed. By means of a single reference measurement to determine a scaling factor correcting for experimental errors, a framework is created to determine the austenite fraction as a function of time and temperature. In the evaluation of the dilatometric data the effect of the changing carbon concentration in austenite phase is taken into account. The method is applied to dilatometric data for a 0.16C-1.5Mn-0.4Si (wt%) low-silicon transformation induced plasticity (TRIP) multiphase steel. Three typical dilatometric data are obtained by heating the material to 750°C, 800°C or 900°C, which leads to three different microstructures consisting of (1) ferrite, cementite and austenite, (2) ferrite and austenite and (3) full austenite, respectively. The calculated results using the proposed new method are compared with the results from thermodynamic analysis and those from quantitative microscopic analysis. Significant inter-test discrepancies are observed. [less ▲] Detailed reference viewed: 25 (5 ULg) |
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