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A simple thermodynamic model for the doping and alloying of nanoparticles

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تومان
Impurity incorporation into nanoparticles is modeled using thermodynamics. For small particles, entropically driven impurity incorporation is reduced, rendering doping difficult. We show that the free energy of surface impurities in small nanoparticles is lower than core impurities, surface doping therefore...

An experimental and numerical study on heat transfer enhancement for gas heat exchangers fitted with porous media

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تومان
The present experimental and numerical work investigates the effect of metallic porous materials, inserted in a pipe, on the rate of heat transfer. The pipe is subjected to a constant and uniform heat flux. The effects of  porosity, porous material...

Fabrication of Nanostructured Electroforming Copper Layer by Means of an Ultrasonic-assisted Mechanical Treatment

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Electroformed copper layer with nanostructure is obtained using a subsequent mechanical treatment under  the conditions of ultrasonic vibration according to the demand of high performance material in aeronautics. The microstructure of the electroformed copper layer is observed by optical microscope...

Impact toughness of high strength low alloy TMT reinforcement ribbed bar

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Charpy V-notch impact toughness of 600 MPa yield stress TMT rebars alloyed with copper, phosphorus,  chromium and molybdenum has been evaluated. Subsize Charpy specimens were machined from the rebar keeping the tempered martensite rim intact. The copper–phosphorus rebar showed toughness...

Innovative coupled fluid–structure interaction model for carbon nano-tubes conveying fluid by considering the size effects of nano-flow and nano-structure

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تومان
In this article, we reappraise the well-known equation of motion for a pipe conveying viscous fluid. We utilize  prominent principles of fluid mechanics such as Navier–Stokes’ equation as well as several benchmark  references in the field of fluid–structure interaction (FSI)...

Mechanical properties of foamed concrete exposed to high temperatures

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This paper reports the results of an experimental and analytical study to investigate the mechanical  properties of unstressed foamed concrete exposed to high temperatures. Two densities of foamed concrete, 650 and 1000 kg/m3, were made and tested with additional tests...

Nonlinear Viscoelastic Analysis of Thick Walled Cylindrical Composite Pipes

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تومان
This paper analyzes the effect of the polymer matrix non-viscoelastic behaviour in the mechanical behaviour of thick multilayered cylinders. The original contribution of this work is to provide novel approximate analytical solutions to compute the timedependent internal stress state throughout...

Preparation of novel porous solids from alumina-pillared fluorine micas by acid-treatment

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تومان
New porous solids from alumina-pillared fluorine micas (APMs), which were obtained from synthetic Na-  tetrasilicic fluorine mica [NaMg2.5Si4O10F2], were prepared by sulfuric acid-treatment under mild conditions at 25 C. The products were investigated by XRD, ICP, SEM, TEM and N2...

Recent advances in corrosion protective composite coatings based on conducting polymers and natural resource derived polymers

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تومان
Conducting polymer (CP) coatings have been extensively investigated for corrosion protection of iron, steel and other metals owing to their superior performance in highly aggressive environments and ecofriendly  characteristics. Corrosion protective coatings based on CP nanocomposites have opened a new...
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