Diesel spray interaction with highly porous structures for supporting of liquid distribution in space and its vaporization

2012 ◽  
Author(s):  
M. Weclas ◽  
J. Cypris ◽  
T.M.A. Maksoud
Keyword(s):  
Diesel Spray ◽  
Porous Structures ◽  
Liquid Distribution ◽  
Highly Porous

scholarly journals Enhancing Density-Based Mining Waste Alkali-Activated Foamed Materials Incorporating Expanded Cork

CivilEng ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 523-540
Author(s):  
Imed Beghoura ◽  
Joao Castro-Gomes
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Pore Size ◽  
Physical And Mechanical Properties ◽  
Critical Parameters ◽  
Porous Structures ◽  
Foaming Agent ◽  
Al Powder ◽  
Highly Porous ◽  
Alkali Activated

This study focuses on the development of an alkali-activated lightweight foamed material (AA-LFM) with enhanced density. Several mixes of tungsten waste mud (TWM), grounded waste glass (WG), and metakaolin (MK) were produced. Al powder as a foaming agent was added, varying from 0.009 w.% to 0.05 w.% of precursor weight. Expanded granulated cork (EGC) particles were incorporated (10% to 40% of the total volume of precursors). The physical and mechanical properties of the foamed materials obtained, the effects of the amount of the foaming agent and the percentage of cork particles added varying from 10 vol.% to 40% are presented and discussed. Highly porous structures were obtained, Pore size and cork particles distribution are critical parameters in determining the density and strength of the foams. The compressive strength results with different densities of AA-LFM obtained by modifying the foaming agent and cork particles are also presented and discussed. Mechanical properties of the cured structure are adequate for lightweight prefabricated building elements and components.

scholarly journals Porous Ni Photocathodes Obtained by Selective Corrosion of Ni-Cu Films: Synthesis and Photoelectrochemical Characterization

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 453 ◽  
Author(s):  
Laura Mais ◽  
Simonetta Palmas ◽  
Michele Mascia ◽  
Elisa Sechi ◽  
Maria Francesca Casula ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Relaxation Times ◽  
Synthesis Method ◽  
Porous Structures ◽  
Porous Nickel ◽  
Cu Films ◽  
Simulated Solar Light ◽  
Photoelectrochemical Characterization ◽  
Nickel Electrodes ◽  
Highly Porous

In this work, a dealloying technique is proposed as a synthesis method to obtain highly porous Nickel electrodes starting from Ni-Cu co-deposit: pulsed corrosion is applied adopting different corrosion and relaxation times. Different morphologies, pore size distribution and residual copper amount were obtained depending on the corrosion conditions. For the developed electrodes, the surface roughness factor, Rf, was evaluated by electrochemical impedance spectroscopy (EIS). The hydrogen evolution reaction (HER) on these electrodes was evaluated by means of steady-state polarization curves, and the related parameters were derived by Tafel analysis. Finally, a thin layer of NiO on the porous structures was obtained to exploit the semiconductor characteristic of the oxide, so that an extra-photopotential was obtained by the simulated solar light action. Results demonstrate greater apparent activity of the developed electrodes towards HER in comparison with commercial smooth Ni electrode, which can be mainly attributed to the large Rf obtained with the proposed technique.

scholarly journals Expansion volume of alkali activated foamed cork composites from tungsten mining mud waste with aluminium

2019 ◽  
Vol 274 ◽  
pp. 03002
Author(s):  
Imed Beghoura ◽  
Joao Castro-Gomes ◽  
Haroon Ihsan ◽  
John Pickstone ◽  
Nuno Estrada
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Mechanical And Thermal Properties ◽  
Porous Structures ◽  
Expansion Process ◽  
Foaming Agent ◽  
Al Powder ◽  
Highly Porous ◽  
Alkali Activated

Several mixes of alkali activated foams from tungsten mud waste (MW), grounded glass (GG) and metakaolin (MK) were developed incorporating expanded granulated cork (EGC). This study presents preliminary results of the expansion process obtained with the addition of aluminium (AL) powder as a foaming agent. 0.3 wt.%, 0.4 wt.% to 0.5wt.% of AL powder were added to the alkali activated matrix. The physical and mechanical properties of the obtained foams, the effects of the type and amount of the foaming agent added are presented and discussed. Highly porous structures were obtained, with overall expansion up to 68.2% when the AL powder was added. The size and distribution of pores are shown. The compressive strength of foams in the case of highly porous structures achieved of 1.2 MPa for the samples containing 0.5 wt.% of AL powder. Mechanical and thermal properties of the cured structure are good and can therefore be used for applications in acoustic panels and lightweight prefabricated components for thermal insulation purposes.

Experimental study of flow and heat exchange in highly porous structures

1987 ◽  
Vol 53 (3) ◽  
pp. 987-990 ◽  
Author(s):  
Yu. F. Gortyshov ◽  
G. B. Murav'ev ◽  
I. N. Nadyrov
Keyword(s):  
Experimental Study ◽  
Heat Exchange ◽  
Porous Structures ◽  
Highly Porous

The preparation of highly porous structures from filamentary nickel powders

2003 ◽  
Vol 123 (2) ◽  
pp. 253-260 ◽  
Author(s):  
A.Y. Zaitsev ◽  
D.S. Wilkinson ◽  
G.C. Weatherly ◽  
T.F. Stephenson
Keyword(s):  
Porous Structures ◽  
Nickel Powders ◽  
Highly Porous

Freestanding MoO2/Mo2C imbedded carbon fibers for Li-ion batteries

2017 ◽  
Vol 19 (4) ◽  
pp. 2908-2914 ◽  
Author(s):  
Hongqin Li ◽  
Haijun Ye ◽  
Zheng Xu ◽  
Chuanyi Wang ◽  
Jiao Yin ◽  
...  
Keyword(s):  
Energy Storage ◽  
Carbon Fibers ◽  
Lithium Ion ◽  
Phosphomolybdic Acid ◽  
Porous Structures ◽  
Molybdic Acid ◽  
Li Ion Batteries ◽  
Storage Performance ◽  
Li Ion ◽  
Highly Porous

Flexible and freestanding MoO2/Mo2C ICFs have been synthesized via an integrated procedure. The MoO2/Mo2C ICFs derived from phosphomolybdic acid presented more highly porous structures than those derived from molybdic acid, resulting in an enhanced energy storage performance for lithium ion batteries.

Investigation of the Effect of Electrospun Polyethersulfone Nanofibers in Membrane

2011 ◽  
Vol 312-315 ◽  
pp. 607-612 ◽  
Author(s):  
Samaneh Shahgaldi ◽  
Zahira Yaakob ◽  
Mostafa Ghasemi ◽  
Wan Ramli Wan Daud ◽  
Dariush Jafar Khadem
Keyword(s):  
Phase Inversion ◽  
Cost Effective ◽  
Porous Structures ◽  
Effective Parameters ◽  
One Dimensional ◽  
Nanostructure Materials ◽  
Large Production ◽  
1D Nanostructure ◽  
Pes Membrane ◽  
Highly Porous

One dimensional (1D) nanostructure materials such as nanowires, nanofibers, and nanorods with porous structures have potential for use in various applications. Electrospinning is one of the versatile techniques with the ability of producing cost-effective, large production, highly porous nanofibers and membrane with large surface to volume ratios. Poly ether sulfone (PES) is a kind of special engineering plastic with good processing characteristics. In this paper, synthesis of PES membrane was investigated by two main methods, i.e. phase inversion and electrospiing. For electrospining, the main effective parameters such as concentration of polymer and solvent, for finding the optimized condition of electrospun PES membrane was studied. The produced membranes were characterized by SEM for morphology and BET observation of surface area, permeability, flux, and mechanical propertise for different applications.

scholarly journals Instrumented Indentation of Super-Insulating Silica Compacts

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 830 ◽  
Author(s):  
Belynda Benane ◽  
Sylvain Meille ◽  
Geneviève Foray ◽  
Bernard Yrieix ◽  
Christian Olagnon
Keyword(s):  
Mechanical Properties ◽  
Porous Silica ◽  
Silica Aerogels ◽  
Spherical Indentation ◽  
Porous Structures ◽  
Instrumented Indentation ◽  
Multi Scale ◽  
Precipitated Silica ◽  
Highly Porous ◽  
Porosity Fraction

Highly porous silica compacts for superinsulation were characterized by instrumented indentation. Samples showed a multi-scale stacking of silica particles with a total porous fraction of 90 vol %. The two main sources of silica available for the superinsulation market were considered: fumed silica and precipitated silica. The compacts processed with these two silica displayed different mechanical properties at a similar porosity fraction, thus leading to different usage properties, as the superinsulation market requires sufficient mechanical properties at the lowest density. The measurement of Young’s modulus and hardness was possible with spherical indentation, which is an efficient method for characterizing highly porous structures. Comparison of the mechanical parameters measured on silica compacts and silica aerogels available from the literature was made. Differences in mechanical properties between fumed and precipitated compacts were explained by structural organization.

Cobalt oxyhydroxide with highly porous structures as active and stable phase for efficient water oxidation

2019 ◽  
Vol 303 ◽  
pp. 231-238 ◽  
Author(s):  
Jian Du ◽  
Chao Li ◽  
Xilong Wang ◽  
Timothy G.J. Jones ◽  
Han-Pu Liang
Keyword(s):  
Water Oxidation ◽  
Stable Phase ◽  
Porous Structures ◽  
Cobalt Oxyhydroxide ◽  
Highly Porous

A Review on Research of Carbonaceous and Carbon-Supported Sorbents for Flue Gas Desulfurization

2013 ◽  
Vol 295-298 ◽  
pp. 1497-1501 ◽  
Author(s):  
Jin Xiao Dou ◽  
Jiang Long Yu ◽  
Chao Ling Song ◽  
Feng Kui Yin
Keyword(s):  
Flue Gas ◽  
Coal Combustion ◽  
Production Costs ◽  
Flue Gas Desulfurization ◽  
Porous Structures ◽  
Active Components ◽  
Operation Conditions ◽  
Process Operation ◽  
Highly Porous ◽  
So2 Pollution

The development of flue gas desulphurization technologies and the control and reduction of SO2 pollution from coal combustion have become a hot research topic due to environmental concerns. Carbonaceous and carbon supported desulfurizing sorbents have highly porous structures, large specific surface area and low production costs and can be widely used as desulfurizer. This paper provides a comprehensive review of carbonaceous and carbon-based desulfurizing sorbents, including active components, compositions of raw gas and effects of process operation conditions. It can be concluded that the use of char supported metal desulfurizing sorbents for removing sulfur dioxide from flue gas is a promising technology. Different aspects of applications of carbonaceous and carbon-supported desulfurization sorbents are discussed in detail.

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