Low cost porous alumina with tailored gas permeability and mechanical properties prepared using rice husk and sucrose for filter applications

Kumar, Ajay; Mohanta, Kalyani; Kumar, Devendra

doi:10.1016/j.micromeso.2015.04.004

Cited by 20 publications

(15 citation statements)

References 52 publications

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“…In previous works on porous ceramics, gas permeability proved to be directly dependent on the total pore-volume fraction [32], tortuosity, and the average pore size of the sample [29,32,37,38]. Fig.…”

Section: Microstructure Dependencementioning

confidence: 95%

“…If the permeability is known as a function of the microstructure, then the pressure drop can be predicted under a given flow rate and the microstructure can be improved by tailoring pore characteristics [28]. However, high values of porosity cause lower mechanical strength and stability [22][23][24], despite the high permeability [29], and thus finding the balance between the two parameters is one of the main challenges in making a suitable material for filtering applications.…”

Section: Introductionmentioning

confidence: 99%

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Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

et al. 2016

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Biomorphic SiC is a biotemplated material fabricated by Si melt-infiltration of carbon preforms from wood pyrolysis. In this work, porous bioSiC ceramics from five different wood precursors, with porosities between 45 and 72% were studied for their feasibility in filtering applications. Gas permeability and mechanical stability were investigated as a function of the microstructure of the starting wood precursor. Air-permeation performance at room temperature was measured for a range of flow rates, and the permeability constants were assessed by fitting of Forchheimer's equation to the experimental data. Darcian permeabilities were achieved in the range 10 −11 -10 −12 m 2 , while inertial terms were in the range 10 −7 -10 −8 m, showing a correlation with the average pore size and orientation of the larger channels. Regarding the mechanical stability, maximum compressive strength values were reached in the range of 3-115 MPa. These results improve our understanding of the ways in which the microstructure influences permeability and mechanical robustness, enabling the device requirements to be tailored by selecting the wood precursor. It was also shown that these materials are promising for hot-gas filtering applications.

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Section: Microstructure Dependencementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

et al. 2016

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“…Localized anodizing of metal surfaces using electrochemical droplet cell techniques is of prime importance for the fabrication of thin film capacitors, resistors, electronic circuits, interconnects and porous alumina filters [14] , [15] , [16] , [17] . Two types of electrochemical droplet cells, i.e.…”

Section: Introductionmentioning

confidence: 99%

3D printed solution flow type microdroplet cell for simultaneous area selective anodizing

Bilal

Sakairi

2020

Journal of Advanced Research

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“…[9][10][11] Thus far, compared with freeze casting 12 or direct foaming, 2,8 slurry gelation and foaming, 13 and other foaming methods, 14 the use of pore-forming agents which can dominate the shape, size, and amount of pores in porous materials by choosing suitable pore-forming agents type, size, and incorporation content 15 is still the most common used method to produce porous ceramics with porosity not more than 70%. 16 A wide variety of pore-forming agents such as coffee grounds, bioactive yeast, polystyrene sphere (PS), poppy seed, corn cob, and activated carbon 4,[17][18][19][20][21] had been employed for preparing porous ceramics. Among the various pore-forming agents, those from biological sources which include not only microorganisms, plant stems, leaves, fruits, seeds, etc, but also some agricultural and sideline products and their byproducts generated in course of manufacture have occupied a great proportion because of their easy ejection (by burning them out) without any toxicity and low prices; some of them can even play dual roles as binder and pore former, for instance sucrose and wheat particles.…”

Section: Introductionmentioning

confidence: 99%

“…Thus far, compared with freeze casting 12 or direct foaming, 2,8 slurry gelation and foaming, 13 and other foaming methods, 14 the use of pore‐forming agents which can dominate the shape, size, and amount of pores in porous materials by choosing suitable pore‐forming agents type, size, and incorporation content 15 is still the most common used method to produce porous ceramics with porosity not more than 70% 16 . A wide variety of pore‐forming agents such as coffee grounds, bioactive yeast, polystyrene sphere (PS), poppy seed, corn cob, and activated carbon 4,17‐21 had been employed for preparing porous ceramics.…”

Section: Introductionmentioning

confidence: 99%

Preparation of high‐strength lightweight alumina with plant‐derived pore using corn stalk as pore‐forming agent

et al. 2020

Int J Applied Ceramic Tech

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To improve the mechanical and thermal insulation properties of lightweight alumina, which was prepared by using pore‐forming agent from biological sources, the silica sol‐infiltrated corn stalk was utilized. Spring back and hygroscopicity of corn stalk powder as well as cold compressive strength, thermal conductivity, microstructure, and pore size distribution of lightweight alumina were characterized. The results indicate that impregnation of silica sol leads to different degrees of decrease in spring back height due to achieving better mesh by silica gel between the corn stalk powders, and then improves the formability, although at the same time the large number of hydrophilic groups results in an increase in hygroscopicity. Furthermore, sol impregnated pore‐forming agent optimizes the microstructure of the lightweight alumina pores. Lightweight alumina with a cold compressive strength up to 48.64 MPa was produced, and with the silica sol concentration of 3 wt%, lower thermal conductivity values at all test temperatures were obtained. Hence, the use of corn stalk impregnated with the appropriate concentration of silica sol as pore‐forming agent could enhance the mechanical and thermal insulation properties of lightweight alumina for the spheroidization of pore shape, randomization of pore distribution as well as miniaturization of pore size.

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Low cost porous alumina with tailored gas permeability and mechanical properties prepared using rice husk and sucrose for filter applications

Cited by 20 publications

References 52 publications

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

3D printed solution flow type microdroplet cell for simultaneous area selective anodizing

Preparation of high‐strength lightweight alumina with plant‐derived pore using corn stalk as pore‐forming agent

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