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Showing 1 to 20 of 204 for “"impregnation"”.
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Thermoplastic prepreg manufacture by solution impregnation
… were to identify the critical parameters in impregnation of the fiber tow by a thermoplastic solution, and to produce high quality thermoplastic prepreg. Continuous carbon fibers (AS4 and AU4) were impregnated with a thermoplastic resin solution using a research scale, single tow, drum …
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Coal liquefaction enhancement through iron pentacarbonyl impregnation techniques
Includes bibliographical references.
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Service life extension of reinforced concrete structures using hydrophobic impregnation
… in aggressive environments. Hydrophobic (silane) impregnation represents a cost-effective way to increase the durability of concrete structures in cases where insufficient cover quality and depth have been achieved. The hydrophobic impregnation agent lines the internal capillary pore structure and …
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Polymer impregnation and its effect on the rupture properties of leather
… of leather rupture properties following impregnation with polyurethane. It was hypothesised that a better polymer - leather interaction would increase strength. Surface properties of leather fibres were altered (using a hydrophobic agent based on a phosphate ester) to more closely match …
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Polymer impregnation of concrete as a means of improving corrosion resistance
The service life of concrete in particularly extreme bacteriological environments has long been a problem that has been facing engineers and concrete materials experts. This is particularly relevant for the case of concrete sewer pipes, the useful life of which is critically limited by corrosion …
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Butterflies and batteries : advances in liquid repellent surfaces by anisotropic wetting and lubricant impregnation
Recent advances in creating liquid-repellent surfaces have focused on decreasing the interaction between a liquid and a solid surface by modifying the surface's chemistry and cleverly designing its geometry on nano- and millimetric length scales. This thesis explores two advances to control a …
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Evaluation of the effectiveness of deep polymer impregnation as a corrosion abatement technique for overlaid bridge decks
… the 'control'. Two overlay types and polymer impregnation were used in all combinations as treatment methods. The specimens which were impregnated were grooved and dried to 230 °F prior to impregnation and polymerization. The post-treatment corrosion rates were appreciably reduced. Mortar …
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Self-Replenishing, Wear-Resistant and Anti-Sticking Surfaces Based on Liquid Impregnation of Microstructured Mesoporous α-AI₂O₃ [Alpha Alumina] Matrices
… and wear-resistant materials using liquid impregnation of mesoporous alumina (MPA) matrices. Secondly, and equally important is to study their wetting properties post wear. To achieve the outlined objectives, different impregnating liquids such as water, Hexadecane, Dodecane, Fomblin® oil …
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Hydrophobization of Cellulose-Based Fibers for Packaging Applications with Alkyl Ketene Dimers (AKD) and Food-Grade Waxes via Supercritical Impregnation with Carbon Dioxide – Experimental and Thermodynamic Modeling Approaches
This modified material has applications in food packaging, where frequently water-repellant surfaces are required. This method is preferable to traditional coating methods because it sizes across the entire thickness of the substrate rather than just the surface and can be used for non-planar …
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Preparation and Evaluation of Sulfur -Containing Adsorbents for Removal of Mercury From Simulated Coal Combustion Flue Gases
… the samples' properties after sulfur impregnation and to evaluate the adsorbents' Hg0 and HgCl2 equilibrium adsorption capacities. Results indicate that low-cost, high-capacity adsorbents (e.g., CDACs) can be developed from precursors containing inherent sulfur (e.g., coal). The …
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Rhodium as a promoter for an iron Fischer-Tropsch catalyst
… Fe / 8.7 Cu 506 K2O / 372 Al2O3 was prepared by impregnation. Three catalysts with varying mass ratios of rhodium to iron (1.3 Rh/100 Fe; 2.4 Rh/100 Fe; 3.9 Rh/100 Fe) were prepared by incipient wetness impregnation fo the base catalyst using rhodium chloride solution.
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Carbon monoxide clean-up of reformate gas by preferential oxidation
… The first catalyst was prepared by wetness impregnation at a high pH and the second was prepared by incipient wetness impregnation. Catalytic activity was measured at varying temperatures, space velocities as well as O2/CO ratio. The Ru catalyst catalyst prepared using wetness impregnation …
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Wood/Polymeric Isocyanate Resin Interactions: Species dependence
… analysis was used to analyze the effect of resin impregnation on the degradation patterns of wood. The wood-PMDI bond morphology was probed with dynamic and static (creep) mechanical analyses in both dry and plasticized conditions. The effect of resin on wood polymer relaxations was quantitatively …
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Suitability of Casuarina equisetifolia as utility poles in Senegal
… of the preservative treatment were the impregnation pressure and the permeability of the specimens. Retention increased as the impregnation pressure was increased; and at a given pressure, retention was positively correlated to permeability. Since the wood seems to be fairly permeable, …
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Sulfate and Hydroxide Supported on Zirconium Oxide Catalysts for Biodiesel Production
… catalysts of zirconium oxide were produced by impregnation. Zirconium oxide impregnation with sulfuric acid produced acidic solid catalysts. It was determined that impregnation and calcination at 550<sup>o</sup>C (SO₄/ZrO₂-550<sup>o</sup>C) produced the best catalyst for palmitic acid …
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Atomic Scale Characterisation of Pt-Re/CeO2 for the Water Gas Shift Reaction
… for promotion to take place. Traditional impregnation methods are unable to guarantee this close contact due to the non-uniform distribution of both metals on the catalyst support. Colloidal synthesis methods provide a way to ensure the platinum and rhenium are in close contact with each …
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Synthesis, Characterization and Activity of Palladium Catalysts on the Dual Support of Cerium and Aluminum Oxides
<p>The effects of sequence of impregnation (Pd on cerium oxides -alumina and cerium oxides on Pd-alumina) and calcination temperature (500 ℃ and 850 ℃) on the catalytic oxidation of methane under lean conditions were investigated. The catalysts were prepared by a combination of impregnation, slurry …
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THE DEVELOPMENT AND STUDY OF CHELATING SUBSTRATES FOR THE SEPARATION OF METAL IONS IN COMPLEX SAMPLE MATRICES
… resin (MN 200) were functionalised via impregnation with chelating dyestuffs or dynamically modified with small, low molecular weight organic molecules by physical adsorption and chemisorption processes respectively. Improvements in the impregnation of substrates were developed, based …
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Ammoxidation of propene over iron promoted bismuth molybdate for the production of acrylonitrile
… bismuth molybdate (α-phase) followed by iron impregnation at different ratios of iron to bismuth. The influence of iron in the ammoxidation of propene for the formation of an acrylonitrile is to be investigated.
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