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Articles de revues sur le sujet « Porous foam »

Auteur : Grafiati

Publié le 9 novembre 2024

Mis à jour le 25 juillet 2025

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1

Starov, Victor, Anna Trybala, Phillip Johnson, and Mauro Vaccaro. "Foam Quality of Foams Formed on Capillaries and Porous Media Systems." Colloids and Interfaces 5, no. 1 (2021): 10. http://dx.doi.org/10.3390/colloids5010010.

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Foams are of great importance as a result of their expansive presence in everyday life—they are used in the food, cosmetic, and process industries, and in detergency, oil recovery, and firefighting. There is a little understanding of foam formation using soft porous media in terms of the quality of foam and foam formation. Interaction of foams with porous media has recently been investigated in a study by Arjmandi-Tash et al., where three different regimes of foam drainage in contact with porous media were observed. In this study, the amount of foam generated using porous media with surfactant

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Johnson, Phillip, Mauro Vaccaro, Victor Starov, and Anna Trybala. "Foam Formation and Interaction with Porous Media." Coatings 10, no. 2 (2020): 143. http://dx.doi.org/10.3390/coatings10020143.

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Foams are a common occurrence in many industries and many of these applications require the foam to interact with porous materials. For the first time interaction of foams with porous media has been investigated both experimentally and theoretically by O. Arjmandi-Tash et al. It was found that there are three different regimes of the drainage process for foams in contact with porous media: rapid, intermediate and slow imbibition. Foam formation using soft porous media has only been investigated recently, the foam was made using a compression device with soft porous media containing surfactant

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Agbedor, Solomon-Oshioke, Donghui Yang, Jianqing Chen, Lei Wang, and Hong Wu. "Low-Temperature Reactive Sintered Porous Mg-Al-Zn Alloy Foams." Metals 12, no. 4 (2022): 692. http://dx.doi.org/10.3390/met12040692.

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By using carbamide granules as the space holder, Mg alloy foams with interconnected pore structures were synthesized by reactive sintering of a mixture of Mg, Al and Zn powders. The effect of Zn/Al on the microstructural evolution and compressive strength of porous Mg-9Al-xZn (x = 1, 5) alloy foams was investigated. The phase diagram simulation approach was used to determine the sintering temperature. The analysis results show that the formation of binary secondary phases or intermetallic compounds is a crucial factor in achieving bonding strength for the porous Mg alloy foams. The intermetall

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Yamada, Yasuo, Takumi Banno, Yun Cang Li, and Cui E. Wen. "Anisotropic Mechanical Properties of Nickel Foams Fabricated by Powder Metallurgy." Materials Science Forum 569 (January 2008): 277–80. http://dx.doi.org/10.4028/www.scientific.net/msf.569.277.

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In the present study, porous nickel foam samples with pore sizes of 20 μm and 150 μm and porosities of 60 % and 70 % were fabricated by the space-holding sintering method via powder metallurgy. Electron scanning microscopy (SEM) and Image-Pro Plus were used to characterise the morphological features of the porous nickel foam samples. The anisotropic mechanical properties of porous nickel foams were investigated by compressive testing loading in different directions, i.e. the major pore axis and minor pore axis. Results indicated that the nominal stress of the nickel foam samples increases with

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El-Yaqub, Balarabe, Mohd Haniff Wahid, Zulkarnain Zainal, Abdul Halim Abdullah, and Wan Azlina Wan Ab Karim Ghani. "Characterization of Graphene Oxide Functionalized Carbon Foam as a Potential Material for Different Applications." Sains Malaysiana 53, no. 12 (2024): 3319–28. https://doi.org/10.17576/jsm-2024-5312-15.

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Due to its cheap production, high electrical conductivity, simplicity of doping, and enhanced hydrophilic characteristic, porous carbon foam has a lot of potential for energy storage and conversion applications. In this study, graphene oxide (GO) was successfully grafted onto carbon foam using a simple dip coating technique with the help of a linker. 3D porous carbon foams were created using a one-step carbonization from commercial melamine foam. The material was characterized using XRD, FTIR, BET, TGA, XPS, Raman and FESEM to confirm its structural, functional group, surface area, thermal sta

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Shih, Albert J., and Zhenhua Huang. "Three-Dimensional Optical Measurements of Porous Foams." Journal of Manufacturing Science and Engineering 128, no. 4 (2006): 951–59. http://dx.doi.org/10.1115/1.2194556.

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The optical, noncontact stereovision system and data analysis procedure are developed for the measurement of porous foams. The stereovision measurement system has demonstrated the capability to capture both the micro-scale features and the macro-scale shape of both the open-cell and closed-cell porous foams. A computational procedure, denoted as the grid method, is developed to identify representative planes on the porous foam surface using the stereovision measured data points. The relative positions between planes can be used to calculate the angles and distances between porous foam surfaces

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Douarche, Frederic, Benjamin Braconnier, and Bernard Bourbiaux. "Foam placement for soil remediation: scaling foam flow models in heterogeneous porous media for a better improvement of sweep efficiency." Science and Technology for Energy Transition 78 (2023): 42. http://dx.doi.org/10.2516/stet/2023036.

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If injected with a large gas fraction, foam reduces mobility more in high-permeability layers and diverts flow to low-permeability layers. Here is a qualitative statement that has been claimed many times in many works related to environmental remediation and oil recovery. It is so true and relevant for foam flow in porous media and yet so little quantified and even less exploited in Darcy-scale numerical simulation. After briefly reviewing opportunities and challenges related to the use of foams in porous media and its Darcy-scale implicit-texture and population-balance modelling, we make a de

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Wong, Pei-Chun, Sin-Mao Song, Pei-Hua Tsai, et al. "Using Cu as a Spacer to Fabricate and Control the Porosity of Titanium Zirconium Based Bulk Metallic Glass Foams for Orthopedic Implant Applications." Materials 15, no. 5 (2022): 1887. http://dx.doi.org/10.3390/ma15051887.

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In this study, a porous titanium zirconium (TiZr)-based bulk metallic foam was successfully fabricated using the Cu spacer by employing the hot press method. TiZr-based bulk metallic foams with porosities ranging from 0% to 50% were fabricated and analyzed. The results indicate that thermal conductivity increased with the addition of Cu spacer; the increased thermal conductivity reduced the holding time in the hot press method. Moreover, the compressive strength decreased from 1261 to 76 MPa when the porosity of the TiZr-based bulk metallic foam increased to 50%, and the compressive strength w

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Wong, Wai Yee, Ahmad Fauzi Mohd Noor, and Radzali Othman. "Sintering of Beta-Tricalcium Phosphate Scaffold Using Polyurethane Template." Key Engineering Materials 694 (May 2016): 94–98. http://dx.doi.org/10.4028/www.scientific.net/kem.694.94.

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Porous beta-tricalcium phosphate (β-TCP) bioceramic has been reported as synthetic graft for cancellous bone substitute due to its biocompatibility and biodegradability properties. A highly porous and interconnected porosity architecture of bone scaffold facilitates attachment and in-growth of new bone tissue. β-TCP foam, a porous 3-dimensional scaffold was fabricated by employing polymeric foam replica method in this study. Polyurethane (PU) foam was used as the sacrificial template, in which β-TCP slurry with powder to water ratio of 10g:10ml was coated on PU template and sintered to 1100, 1

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Thanh, Tram Nguyen Xuan, Michito Maruta, Kanji Tsuru, Alireza Valanezhad, Shigeki Matsuya, and Ishikawa Kunio. "Fabrication of Calcite Foam by Inverse Ceramic Foam Method." Key Engineering Materials 529-530 (November 2012): 153–56. http://dx.doi.org/10.4028/www.scientific.net/kem.529-530.153.

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We have previously reported that calcite foam that had interconnected porous structure could be prepared by ceramic foam method and it transformed to carbonate apatite (CO3Ap). In the ceramic foam method, polyurethane sponge was used as a template. The polyurethane sponge was immersed in the ceramics slurry, and the strut of the polyurethane foam was covered by ceramic powder. After that it was dried and sintered at high temperature. Calcite foams produced by this approach were comprised of a three-dimensional (3D) interconnected porous structure that facilitated cell penetration. However, all

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Xiong, Jian Yu, Yun Cang Li, Yasuo Yamada, Peter D. Hodgson, and Cui E. Wen. "Processing and Mechanical Properties of Porous Titanium-Niobium Shape Memory Alloy for Biomedical Applications." Materials Science Forum 561-565 (October 2007): 1689–92. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1689.

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Ti-26 at.%Nb (hereafter Ti-26Nb) alloy foams were fabricated by space-holder sintering process. The porous structures of the foams were characterized by scanning electron microscopy (SEM). The mechanical properties of the Ti-26Nb foam samples were investigated using compressive test. Results indicate that mechanical properties of Ti-26Nb foam samples are influenced by foam porosity. The plateau stresses and elastic moduli of the foams under compression decrease with the increase of their porosities. The plateau stresses and elastic moduli are measured to be from 10~200 MPa and 0.4~5.0 GPa for

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Zhang, Xiaoyang, Liqun Tang, Zhenyu Jiang, Zejia Liu, Yiping Liu, and Daining Fang. "Effects of Meso Shape Irregularity of Metal Foam on Yield Features under Triaxial Loading." International Journal of Structural Stability and Dynamics 15, no. 07 (2015): 1540014. http://dx.doi.org/10.1142/s0219455415400143.

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Metallic foam is a typical porous material with heterogeneous meso structures that affect the metallic foam's mechanical properties, in which shape irregularity of meso structures (porous cells) is the key. Shape irregularity of a porous cell reflects the deviation the cell shape from a sphere having the same volume. This paper examines the effects of meso shape irregularity of metallic foam on yield features based on three-dimensional (3D) Voronoi model and the finite element (FE) method. Three cubic foams designed by 3D Voronoi technique were constructed to furnish different statistics of sh

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Lagzdiņš, Aivars, Alberts Zilaucs, Ilze Beverte, and Jānis Andersons. "Modeling the Nonlinear Deformation of Highly Porous Cellular Plastics Filled with Clay Nanoplatelets." Materials 15, no. 3 (2022): 1033. http://dx.doi.org/10.3390/ma15031033.

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Rigid low-density plastic foams subjected to mechanical loads typically exhibit a nonlinear deformation stage preceding failure. At moderate strains, when the geometrical nonlinearity is negligible, such foam response is predominantly caused by the nonlinearity of deformation of their principal structural elements—foam struts. Orientational averaging of stresses in foam struts enables estimation of the stresses taken up by foams at a given applied strain. Based on a structural model of highly porous anisotropic cellular plastics filled with clay nanoplatelets and the orientational averaging, a

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Hu, Yi, Hongwei Wang, Xianliang Ren, et al. "Enhancing Methylene Blue Adsorption Performance of Ti3C2Tx@Sodium Alginate Foam Through Pore Structure Regulation." Nanomaterials 14, no. 23 (2024): 1925. https://doi.org/10.3390/nano14231925.

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Pore structural regulation is expected to be a facile way to enhance the adsorption performance of MXene. In this work, spherical foam composites consisting of Ti3C2Tx and sodium alginate (SA) were synthesized via a vacuum freeze-drying technique. By varying the solution volume of Ti3C2Tx, four distinct Ti3C2Tx@SA spherical foams with honeycomb-like and lamellar structures with a pore diameter in the range of 100–300 μm were fabricated. Their methylene blue (MB) adsorption performances were then systematically compared. The results revealed that the honeycomb-like porous-structured spherical f

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Nikaido, Taro, Kanji Tsuru, Fumikazu Daitou та ін. "Fabrication of βTCP with Fully-Interconnected Porous Structure". Key Engineering Materials 493-494 (жовтень 2011): 135–38. http://dx.doi.org/10.4028/www.scientific.net/kem.493-494.135.

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Calcium phosphate foam could be an ideal bone filler and scaffold for tissue engineering. This paper describes fabrication method of β-tricalcium phosphate (βTCP) foam with fully-interconnected porous structure by employing magnesium oxide (MgO) as βTCP stabilizer. The foam was prepared using the so-called ceramics foam method. MgO was added to calcium carbonate and dicalcium phosphate dihydrate so that 0, 1, 2, 3, 4, 6 and 8 mol% calcium would be substituted by magnesium (Mg) in βTCP structure. After sintering at 1500°C, crystal phase of the obtained foam included α-tricalcium phosphate (αTCP

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Antonini, Carlo, Tingting Wu, Tanja Zimmermann, et al. "Ultra-Porous Nanocellulose Foams: A Facile and Scalable Fabrication Approach." Nanomaterials 9, no. 8 (2019): 1142. http://dx.doi.org/10.3390/nano9081142.

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Cellulose nanofibril foams are cellulose-based porous materials with outstanding mechanical properties, resulting from the high strength-to-weight ratio of nanofibrils. Here we report the development of an optimized fabrication process for highly porous cellulose foams, based on a well-controlled freeze-thawing-drying (FTD) process at ambient pressure. This process enables the fabrication of foams with ultra-high porosity, up to 99.4%, density of 10 mg/cm3, and liquid (such as oil) absorption capacity of 100 L/kg. The proposed approach is based on the ice-templating of nanocellulose suspension

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Kang, Yeon June, and J. Stuart Bolton. "Optimal Design of Acoustical Foam Treatments." Journal of Vibration and Acoustics 118, no. 3 (1996): 498–504. http://dx.doi.org/10.1115/1.2888212.

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A finite element model for elastic porous materials is presented that allows for interfaces with adjacent acoustical media that are arbitrarily oriented with respect to the global coordinate system. The foam finite element is based on a complete elastic porous material theory that can account for all the three wave types known to be significant in foams. Example problems are used to illustrate the application of foam finite elements to the optimal design of a foam wedge terminating a waveguide. The wedge angle is used as a design parameter (while the wedge volume is held constant) and the perf

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Hedayati, Reza, Alejandro Rubio Carpio, Salil Luesutthiviboon, et al. "Role of Polymeric Coating on Metallic Foams to Control the Aeroacoustic Noise Reduction of Airfoils with Permeable Trailing Edges." Materials 12, no. 7 (2019): 1087. http://dx.doi.org/10.3390/ma12071087.

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Studies on porous trailing edges, manufactured with open-cell Ni-Cr-Al foams with sub-millimeter pore sizes, have shown encouraging results for the mitigation of turbulent boundary-layer trailing-edge noise. However, the achieved noise mitigation is typically dependent upon the pore geometry, which is fixed after manufacturing. In this study, a step to control the aeroacoustics effect of such porous trailing edges is taken, by applying a polymeric coating onto the internal foam structure. Using this method, the internal topology of the foam is maintained, but its permeability is significantly

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Kotresha, Banjara, and Nagarajan Gnanasekaran. "Comparison of Fluid Flow and Heat Transfer Through Metal Foams and Wire Mesh by Using CFD." Recent Patents on Mechanical Engineering 12, no. 3 (2019): 220–26. http://dx.doi.org/10.2174/2212797612666190717163207.

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Background: The unique structural characteristics of the metal foams, such as low density, large surface area, ability to increase turbulence, and increased heat transfer efficiency, are the advantages associated with thermal applications such as electronics cooling, refrigeration air conditioning, etc. The porous metal foam structures are extensively used to enhance heat transfer. Objective: This paper discusses the numerical simulations of a vertical channel filled with metal foam and wire mesh. The fluid flow and heat transfer phenomena of a wire mesh are compared with two different types o

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Şahin, Ethem Ilhan, and Jamal-Eldin F. M. Ibrahim. "Eco-Friendly Synthesis of Geopolymer Foams from Natural Zeolite Tuffs and Silica Fume: Effects of H2O2 and Calcium Stearate on Foam Properties." Buildings 15, no. 6 (2025): 970. https://doi.org/10.3390/buildings15060970.

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The need for environmentally friendly and energy-efficient building materials has increased significantly. This study synthesizes geopolymer foams with enhanced thermal insulation properties using silica fume and natural zeolite tuff. Zeolite’s porous structure and active sites improve polymerization and strengthen the foam, while silica fume reacts with NaOH to release sodium silicate, forming a durable geopolymer matrix. Foam porosity is introduced by generating oxygen gas from H2O2 and NaOH, with calcium stearate stabilizing the foam structure. Comparative analysis of the compressive streng

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Sharma, Shyam, Rahul Khatri, and Anurag Joshi. "A synergistic approach to the development of lightweight aluminium-based porous metallic foam using stir casting method." Metal Working and Material Science 25, no. 4 (2023): 255–67. http://dx.doi.org/10.17212/1994-6309-2023-25.4-255-267.

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Introduction. A synergetic approach to the development of lightweight aluminium metal foam by stir casting process is presented and various mechanical properties and microstructure are tested. The purpose of this study is due to the constant industrial demand for lightweight materials and increased research interest in porous substrates, mainly due to its unique properties. Materials and method. The method used for developing metallic aluminium foam was stir casting with calcium carbonate as a foaming agent to achieve a target interconnected porous microenvironment on a metal foam substrate. R

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Singh, Robin, and Kishore K. Mohanty. "Foams Stabilized by In-Situ Surface-Activated Nanoparticles in Bulk and Porous Media." SPE Journal 21, no. 01 (2016): 121–30. http://dx.doi.org/10.2118/170942-pa.

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Summary Foams for subsurface applications are traditionally stabilized by surfactants. The goal of this work is to study foam stabilization by nanoparticles—in particular, by in-situ surface-hydrophobization of hydrophilic nanoparticles. The interfacial properties of the nanoparticles were modulated by the attachment of short-chain surface modifiers (alkyl gallates) that render them partially hydrophobic, but still fully dispersible in water. First, static foams were generated with nanoparticles with varying concentrations of surface modifiers. The decay of foam height with time was measured,

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Koponen, Antti I., Oleg Timofeev, Ari Jäsberg, and Harri Kiiskinen. "Drainage of high-consistency fiber-laden aqueous foams." Cellulose 27, no. 16 (2020): 9637–52. http://dx.doi.org/10.1007/s10570-020-03416-y.

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AbstractLightweight lignocellulosic fibrous materials (LLFMs) offer a sustainable and biodegradable alternative in many applications. Enthusiastic interest in these materials has recently grown together with the newly risen interest in foam forming. Foam bubbles restrain fiber flocculation, and foam formed structures have high uniformity. Moreover, the bubbles support the fibrous structure during manufacturing enabling the formation of highly porous structures. Mechanical pressure cannot be applied in the manufacture of LLFMs as the materials would lose their porous structure. Water is therefo

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Li, Ying Ge, Dian Cai Geng, Fa Hu Zhang, and Dong Xing Du. "Proper Index of Foam Statics Characteristics on Predicting Foam Dynamics Behavior in Porous Media." Key Engineering Materials 561 (July 2013): 411–16. http://dx.doi.org/10.4028/www.scientific.net/kem.561.411.

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Proper foam statics index can give essential indications on foam dynamic behavior in porous media. In this paper, the statics characteristics are investigated through air-flow method for foam generated with Sodium Dodecyl Sulfate (SDS) surfactant. Parameters of foam height, foam half period time are recorded for various gas phases, surfactant concentrations and injecting gas flow rate, and foam morphology are also visually monitored. It is found the N2 generated foam has better characteristics on foam height, while poorer characteristics on foam half-time period compared to air and CO2 foam. W

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Jang, Hyesoo, Myoung-Hwan Kim, Sang-Kyun Park, Yul-Seong Kim, and Byung Chul Choi. "Simulation of Heat and Mass Transfer Characteristics for the Optimal Operating Conditions of a Gas-to-Gas Membrane Humidifier with Porous Metal Foam." Energies 13, no. 19 (2020): 5110. http://dx.doi.org/10.3390/en13195110.

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The shell-and-tube type gas-to-gas membrane humidifier used with air supply to polymer electrolyte membrane fuel cell supplies heat and vapor through a membrane and does not require an additional power source. Packing porous metal foam in the flow path of the membrane humidifier can result in higher heat and mass transfer efficiencies due to heat conduction through metal. In this study, the influence of various operating conditions and types of porous metal foams on the transport characteristics of the membrane humidifier are evaluated by simulation. The main factor causing the improvement of

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Manetti, L. L., A. S. Moita, and E. M. Cardoso. "Thermal efficiency of metal foams on pool boiling." Journal of Physics: Conference Series 2116, no. 1 (2021): 012005. http://dx.doi.org/10.1088/1742-6596/2116/1/012005.

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Abstract This paper presents an experimental work on pool boiling using HFE-7100 at saturated conditions, under atmospheric pressure, and copper and nickel foams as the heating surface with four different thicknesses varying between 0.5 mm and 3 mm, followed by an analysis of the effect of foam fin-efficiency based on Ghosh model. All foams showed a better heat transfer coefficient (HTC) than the plain surface; however, as the heat flux increased, the HTC from the thicker nickel foams decreased due to the bubble vapor flow inside the foam. On the other hand, the thinner nickel foam showed bett

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Yasmin, Y., M. N. Mazlee, A. H. Norzilah, et al. "The Development and Characterisation of Porous Clay - Precipitated Calcium Carbonate." Key Engineering Materials 694 (May 2016): 189–94. http://dx.doi.org/10.4028/www.scientific.net/kem.694.189.

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Ceramic foams, a porous material with a gyroid structures, are becoming highly demanded for various applications such as heat insulation, bone implantation and filtration, because of their unique properties such as high specific surface area, high porosity and low heat transfer rate. In this study, the development of ceramic foam utilised white clay with a combination of precipitated calcium carbonate (PCC). The ceramic foam was successfully developed using this combination after the sample was sintered at 1250 °C for 2 hours holding time. The various compositions of PCC (10.0, 12.5, 15.0, 17.

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Koursari, Nektaria, Omid Arjmandi-Tash, Phillip Johnson, Anna Trybala, and Victor M. Starov. "Foam drainage placed on a thin porous layer." Soft Matter 15, no. 26 (2019): 5331–44. http://dx.doi.org/10.1039/c8sm02559b.

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A theory of foam drainage placed on thin porous layer is developed. The rate of foam drainage and imbibition inside the porous layer and the possibility of a build-up of a free liquid layer on the foam/porous layer interface are investigated.

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Leong, K. C., L. W. Jin, I. Pranoto, H. Y. Li, and J. C. Chai. "Experimental Study of Enhanced Pool Boiling Heat Transfer Using Graphite Foam Inserts." Defect and Diffusion Forum 312-315 (April 2011): 352–57. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.352.

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This paper presents the results of an experimental study of heat transfer in a pool boiling evaporator with porous insert. Different types of graphite foams were tested with the phase change coolant FC-72 in a designed thermosyphon. Comparisons between the graphite foams and a solid copper block show that the porous structure enhances pool boiling significantly. The boiling thermal resistance of the tested graphite foams was found to be about 2 times lower than that of the copper block. The bubble formation recorded by a high speed camera indicates that boiling from a graphite foam is more vig

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Huang, Yao, Zexin Li, Lucai Wang, et al. "Preparation and Heat Dissipation Properties Comparison of Al and Cu Foam." Metals 12, no. 12 (2022): 2066. http://dx.doi.org/10.3390/met12122066.

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The space holder method, a kind of powder metallurgy method which can avoid the process of melting metal to prepare metal foams, has particular significance in solving the difficulty of preparing metal foams with high melting points. In this paper, Na2S2O3·5H2O, a novel space holder, was used to prepare aluminium foam and copper foam, which were then used to test the heat dissipation performance of the metal foams. We first prepared two kinds of cell structures for (spherical cell and composite cells) aluminium and copper foam, then, we compared the performances of their heat dissipation, and

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Werner, David, Johanna Maier, Nils Kaube, et al. "Tailoring of Hierarchical Porous Freeze Foam Structures." Materials 15, no. 3 (2022): 836. http://dx.doi.org/10.3390/ma15030836.

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Freeze foaming is a method to manufacture cellular ceramic scaffolds with a hierarchical porous structure. These so-called freeze foams are predestined for the use as bone replacement material because of their internal bone-like structure and biocompatibility. On the one hand, they consist of macrostructural foam cells which are formed by the expansion of gas inside the starting suspension. On the other hand, a porous microstructure inside the foam struts is formed during freezing and subsequent freeze drying of the foamed suspension. The aim of this work is to investigate for the first time t

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Marzuki, Ainaa Amirah, Nur Azmah Nordin, Saiful Amri Mazlan, et al. "Magnetic and Structural Analysis of Magnetorheological Foam Fabricated by Constraining Volumes of Foaming Process." Journal of Advanced Research in Micro and Nano Engineering 31, no. 1 (2025): 40–50. https://doi.org/10.37934/armne.31.1.4050.

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Magnetorheological (MR) foam has become a topic of research interest due to its potential breakthrough in smart soft robotic applications, due to its versatility, high flexibility and durability. In fact, it has controllable properties that could be actively changed, reversibly by manipulating external magnetic fields. The process of magnetizing MR foam is highly dependent on the incorporation and distribution of magnetic particles (CIPs) in the porous structure of the foam. In fact, the resultant properties would be affected by the structural arrangement of the material. Therefore, this study

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Dukhan, Nihad. "Equivalent Parallel Strands Modeling of Highly-Porous Media for Two-Dimensional Heat Transfer: Application to Metal Foam." Energies 14, no. 19 (2021): 6308. http://dx.doi.org/10.3390/en14196308.

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A new geometric modeling of isotropic highly-porous cellular media, e.g., open-cell metal, ceramic, and graphite foams, is developed. The modelling is valid strictly for macroscopically two-dimensional heat transfer due to the fluid flow in highly-porous media. Unlike the current geometrical modelling of such media, the current model employs simple geometry, and is derived from equivalency conditions that are imposed on the model’s geometry a priori, in order to ensure that the model produces the same pressure drop and heat transfer as the porous medium it represents. The model embodies the in

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Seciureanu, Mihai, Silviu-Marian Nastac, Maria-Violeta Guiman, and Petronela Nechita. "Cellulose Fibers-Based Porous Lightweight Foams for Noise Insulation." Polymers 15, no. 18 (2023): 3796. http://dx.doi.org/10.3390/polym15183796.

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This paper examines effective and environmentally friendly materials intended for noise insulation and soundproofing applications, starting with materials that have gained significant attention within last years. Foam-formed materials based on cellulose fibers have emerged as a promising solution. The aim of this study was to obtain a set of foam-formed, porous, lightweight materials based on cellulose fibers from a resinous slurry pulp source, and to investigate the impact of surfactant percentage of the foam mixtures on their noise insulation characterisitcs. The basic foam-forming technique

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Xie, Rujia, Zhenxing Fang, Jiefeng Yan, Wei Wang, Xuan Cao, and Xiaoyang Qiu. "Fabrication of diverse carbon forms and their reversed applications in hexane/water separation." Water Science and Technology 82, no. 7 (2020): 1296–303. http://dx.doi.org/10.2166/wst.2020.401.

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Abstract Melamine foam is an important material in production and life. A series of porous carbon foams were obtained through a simple carbonization process of melamine foam at different temperatures. The carbon foams obtained at the carbonization temperature of 400 and 600 °C reveal a hydrophobic and even super-hydrophobic property (water contact angle larger than 150°) with a hexane adsorption much larger than that of melamine foam. However, the carbon foam obtained at the carbonization temperature of 800 °C reveals a super-hydrophilic property (water contact angle smaller than 5°) due to it

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Pinto, Javier, Suset Barroso-Solares, Davide Magrì, et al. "Melamine Foams Decorated with In-Situ Synthesized Gold and Palladium Nanoparticles." Polymers 12, no. 4 (2020): 934. http://dx.doi.org/10.3390/polym12040934.

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A versatile and straightforward route to produce polymer foams with functional surface through their decoration with gold and palladium nanoparticles is proposed. Melamine foams, used as polymeric porous substrates, are first covered with a uniform coating of polydimethylsiloxane, thin enough to assure the preservation of their original porous structure. The polydimethylsiloxane layer allows the facile in-situ formation of metallic Au and Pd nanoparticles with sizes of tens of nanometers directly on the surface of the struts of the foam by the direct immersion of the foams into gold or palladi

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Jang, Lindy K., Landon D. Nash, Grace K. Fletcher, Thomas Cheung, Andrew Soewito, and Duncan J. Maitland. "Enhanced X-ray Visibility of Shape Memory Polymer Foam Using Iodine Motifs and Tantalum Microparticles." Journal of Composites Science 5, no. 1 (2021): 14. http://dx.doi.org/10.3390/jcs5010014.

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Shape memory polymer (SMP) foams are porous materials with high surface area and large volumetric expansion capabilities that are well suited for endovascular occlusion applications, including brain aneurysm embolization. However, many polyurethane SMP foams are inherently radiolucent when X-ray visibility is required to ensure the safe delivery of the foam to the targeted aneurysm site using fluoroscopy. Here, highly radio-dense tantalum microparticles were added to a previously reported triiodobenzene-containing SMP foam (ATIPA foam) premix to fabricate ATIPA foam-tantalum composites (AT_T).

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Wang, Xiaoguang, Wei Li, Dehua Xiong, and Lifeng Liu. "Fast fabrication of self-supported porous nickel phosphide foam for efficient, durable oxygen evolution and overall water splitting." Journal of Materials Chemistry A 4, no. 15 (2016): 5639–46. http://dx.doi.org/10.1039/c5ta10317g.

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Self-supported porous Ni–P foam is fabricated by a convenient one-step method, and exhibits excellent electrocatalytic performance towards oxygen evolution reaction. An alkaline electrolyzer constructed using two self-supported porous Ni–P foams shows superior energy efficiency of 90.2% at 10 mA cm<sup>−2</sup>, and can sustain 1000 h under operation conditions without obvious degradation.

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Hsu, Y. H., I. G. Turner, and A. W. Miles. "Fabrication of Porous Calcium Phosphate Bioceramics as Synthetic Cortical Bone Graft." Key Engineering Materials 284-286 (April 2005): 305–8. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.305.

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The aim of this study was to fabricate porous Hydroxyapatite/Tricalcium phosphate (HA/TCP) bioceramics with an adequate degree of interconnected porosity combined with optimal mechanical properties. Porous HA/TCP bioceramics with interconnected porosity and the controlled pore sizes necessary to simulate natural bone tissue morphology were fabricated by a novel technique of vacuum impregnation of reticulated polymeric foams with ceramic slip. By varying the characteristics of the slips and using foams of different pores per inch (ppi), samples of porous HA/TCP, blocks and granules, with a wide

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Wadi, Vijay S., Kishore K. Jena, Shahrukh Z. Khawaja, Vengatesan Muthukumarswamy Ranagraj, and Saeed M. Alhassan. "Preparation and processing of porous sulfur foams having low thermal conductivity." RSC Advances 9, no. 8 (2019): 4397–403. http://dx.doi.org/10.1039/c8ra09127g.

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Porous sulfur foams were prepared by combining inverse vulcanization and template removal techniques. The porosity of the foam was altered by varying the template particle size; which lead to drop in thermal conductivity.

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Krčmářová, Nela, Jan Šleichrt, Tomáš Doktor, Daniel Kytýř, and Ondřej Jiroušek. "SEMI–AUTOMATED ASSESSMENT OF MICROMECHANICAL PROPERTIES OF THE METAL FOAMS ON THE CELL-WALL LEVEL." Acta Polytechnica CTU Proceedings 7 (December 9, 2016): 72. http://dx.doi.org/10.14311/app.2017.7.0072.

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Metal foams are innovative porous material used for wide range of application such as deformation energy or sound absorption, filter material, or microbiological incubation carrier. To predict mechanical properties of the metal foam is necessary to precisely describe elasto–plastic properties of the foam on cell–wall level. Indentation with low load is suitable tool for this purpose. In this paper custom designed instrumented microindentation device was used for measurement of cell-wall characteristics of two different aluminium foams (ALPORAS and ALCORAS). To demonstrate the possibility of au

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Sirikulchaikij, Sanit, Benjaporn Nooklay, Rungrote Kokoo, and Matthana Khangkhamano. "Rubber Foam Processing via Bubbling Technique." Materials Science Forum 962 (July 2019): 96–100. http://dx.doi.org/10.4028/www.scientific.net/msf.962.96.

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Natural rubber foams are currently produced by the two well-known processes of Dunlop and Talalay. Dunlop process, however, requires a high-speed Hobart Mixer to generate a high bubble-volume, while Talalay is complexity and expensive technique. Here, a simple and inexpensive technique for rubber foam production was introduced. The process involved air flowing with a constant flow rate through a porous diffuser, firmly connected to the bubble column containing compound latex, to generate a high bubble-volume. Microstructure of the as-produced rubber foams was examined using a scanning electron

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Righetti, G., C. Zilio, G. Savio, R. Meneghello, M. Calati, and S. Mancin. "Experimental pressure drops during the water flow into porous materials realized via additive manufacturing." Journal of Physics: Conference Series 2116, no. 1 (2021): 012059. http://dx.doi.org/10.1088/1742-6596/2116/1/012059.

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Abstract Open-cell foams offer several interesting possibilities in numerous technological fields. In fact, they present high surface area to volume ratio as well as enhanced flow mixing and attractive stiffness and strength. However, their complete and reliable characterization has not been completed yet. In fact, there is still no a comprehensive work that relates all the foam geometrical characteristics to their heat transfer and pressure drop features. This paper is the very first outcome of a larger study that aims at realizing open-cell foams via additive manufacturing, testing them, the

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Myalski, Jerzy, Bartosz Hekner, and Andrzej Posmyk. "The influence of glassy carbon on tribological properties in metal – ceramic composites with skeleton reinforcement." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, CICMT (2015): 000121–24. http://dx.doi.org/10.4071/cicmt-tp44.

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This paper presents a results of mechanical and tribological properties of aluminum based composites with skeleton reinforcement. The aluminum alloy based composites were produced using pressure infiltration process. As a reinforcement ceramic foam with opened cells was applied. This reinforcement structure give an opportunity to limit the most common defects (like agglomeration, inhomogeneity, ect.) occurring in composite materials obtained by casting. In presented research three different types of porous foam were analysed. There were alumina foam covered by thin glassy carbon layer (Al2O3 –

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Zhu, Qing You, Weike Peng, Cheng Ji Deng, and Hong Xi Zhu. "The Preparation of Porous Andalusite Refractory by Foaming Method." Advanced Materials Research 881-883 (January 2014): 1026–30. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1026.

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Andalusite can be used to produce porous refractory with the method of foaming and its properties are very good. The bulk density can be controlled by the quantity of foam easily. The compressive strength can reach almost 9 Mpa (1.0g/cm3). The expansion transmit by pores, the remianing andalusite and the transverse growing of mullite crystal are all good for the stabilization of sample during heating. The agglomeration of foam is bad for foaming slurry while stiring, so one way to well-distribute the pores is enhancing the strength of foams. Andalusite can prolong the lifetime of refractory.

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Ranito, Cláudia M. S., Fernando A. Costa Oliveira, and João P. Borges. "Hydroxyapatite Foams for Bone Replacement." Key Engineering Materials 284-286 (April 2005): 341–44. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.341.

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Hydroxyapatite, often in the form of synthetic porous blocks, has been used in the repair of bone defects for over 20 years owing to its biocompatibility and osseoconductive behaviour. Bone ingrowth requires the existence of open and interconnected pores with diameters larger than 150 µm for proper circulation of nutrients. Hence, currently available materials are characterised by poor mechanical properties. Collapse of such products is therefore a major source of concern to surgeons using these weak materials in bone surgery. There is a need to develop stronger highly porous structures throug

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Xu, Huijin, Yan Wang, and Xingchao Han. "Analytical considerations of thermal storage and interface evolution of a PCM with/without porous media." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 1 (2019): 373–400. http://dx.doi.org/10.1108/hff-02-2019-0094.

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Purpose Phase change energy storage is an important solution for overcoming human energy crisis. This study aims to present an evaluation for the thermal performances of a phase change material (PCM) and a PCM–metal foam composite. Effects of pore size, pore density, thermal conductivity of solid structure and mushy region on the thermal storage process are examined. Design/methodology/approach In this paper, temperature, flow field and solid–liquid interface of a PCM with or without porous media were theoretically assessed. The influences of basic parameters on the melting process were analyz

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Wang, Jinping, Naveed Mushtaq, M. A. K. Yousaf Shah та ін. "Oxygen Reduction Response of La and Ce Co-Doped SrCoO3-δ Perovskite Oxide Grown on Porous Ni-Foam Substrate". Crystals 12, № 11 (2022): 1650. http://dx.doi.org/10.3390/cryst12111650.

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Lately, ceramic fuel cells (CFCs) have held exceptional promise for joint small- and large-scale applications. However, the low-oxygen reduction response of cathode materials has hindered the low operating temperature of CFCs. Herein, we have developed a semiconductor based on La and Ce co-doped SrCoO3 and embedded them in porous Ni-foam to study their electrochemical properties. The porous Ni-foam-pasted La0.2Sr0.8Co0.8Ce0.2O3-δ cathode displays small-area-specific resistance and excellent ORR (oxygen reduction reaction) activity at low operating temperatures (LT) of 450–500 °C. The proposed

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Ribeiro, Christiane, José Carlos Bressiani, and Ana Helena A. Bressiani. "Obtention of TCP Porous Ceramic Using Albumin." Materials Science Forum 530-531 (November 2006): 587–92. http://dx.doi.org/10.4028/www.scientific.net/msf.530-531.587.

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In the last years, the porosity in ceramic materials for implants production has motivated the development of various technologies. Calcium phosphate ceramics, in special the tricalcium phosphate - TCP, are very promising as bone substitutes and scaffolds for tissue engineering. The macroporosity incorporation in TCP ceramics by porogenic, foaming and consolidator agent, as globular protein (ovalbumin) was the focus of this work. Preliminary studies of zeta potential were made to have a suitable suspension. Ovalbumin amounts (5-7 wt%) were added to the ceramic slurries and suspensions with a s

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Ghosh, Pinaki, and Kishore K. Mohanty. "Novel Application of Cationic Surfactants for Foams With Wettability Alteration in Oil-Wet Low-Permeability Carbonate Rocks." SPE Journal 23, no. 06 (2018): 2218–31. http://dx.doi.org/10.2118/179598-pa.

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Summary Carbonate rocks are typically heterogeneous at many scales, leading to low waterflood recoveries. Polymers and gels cannot be injected into nonfractured low-permeability carbonates (k &lt; 10 md) because pore throats are smaller than the polymers. Foams have the potential to improve both oil-displacement efficiency and sweep efficiency in such carbonate rocks. However, foams have to overcome two adverse conditions in carbonates: oil-wettability and low permeability. This study evaluates several cationic-foam formulations that combine wettability alteration and foaming in low-permea

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