Ice-Templating for the Elaboration of Oxygen Permeation Asymmetric Tubular Membrane with Radial Oriented Porosity

Gaudillere, Cyril; García‐Fayos, Julio; Plaza, Jorge; Serra, José M.

doi:10.3390/ceramics2020020

Cited by 6 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…SEM images in Figure show aligned pores perpendicular to the surface of the substrates, thus confirming that the freeze‐casting method was also effective to prepare tubular geometries, as already reported in other studies . The perpendicular pore alignment was consistent for all samples irrespective of the solid loading.…”

Section: Resultssupporting

confidence: 87%

“…Most experiments in freeze‐casting reports are for the production of flat or cylindrical ceramic substrates, though the majority of ceramic substrates for inorganic membrane application have tubular geometries. Nevertheless, there are a limited number of reports for the production of freeze‐cast tubular ceramic substrates . In a few reports, Liu et al produced mullite tubes and Dong et al prepared tubular porous silicate cement.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

et al. 2020

View full text Add to dashboard Cite

Porous substrates play a major role in devices requiring the flow of fluids such as in filters and membranes. Porous substrates are also extensively used for the preparation of inorganic membranes for microfiltration, [1][2][3] desalination, [4][5][6][7] gas separation, [8][9][10][11] and percrystallization processes. [12,13] These inorganic membranes are known as asymmetric membranes as they are conventionally prepared by coating ceramic [14][15][16] or carbon [17][18][19] thin films as top layers on porous substrates. The importance of the porous substrate is to provide the mechanical strength otherwise not available in thin films. Many inorganic materials such as ceramics [20][21][22] and stainless steel [23][24][25] have been manufactured as porous substrates, though alumina is the most used material due to lower costs and processing versatility. Porous substrates come in several geometries such as tubes, [14,[26][27][28] hollow fibers, [29][30][31] and flat surfaces. [19,32] Traditionally, inorganic porous substrates are prepared from conventional ceramic processes such as slip-casting, [33,34] extrusion, [35,36] dry pressing, [37] tapecasting, [38][39][40] and phase inversion hollow fibers. [41,42] A relatively more recent method is the freeze-casting technique for processing porous ceramic substrates. [43][44][45][46] Due to the ability of forming an aligned pore structure, this technique can overcome problems associated with lower fluid fluxes conferred by conventional ceramic processing methods such as tortuous pore structure, constrictions, and dead-end and isolated pores. [47] Freeze-cast starts with the preparation of a stable ceramic suspension (or slurry) at normal conditions followed by controlled freezing of the solvent of the ceramic

show abstract

Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

et al. 2020

View full text Add to dashboard Cite

show abstract

“…For instance, highly anisotropic freeze-cast materials have been explored for development of biomimetic materials [8][9][10] and biomaterials 11,12 . Other applications focused on the high connectivity and tortuosity of macropores in freeze-cast materials for mass transport processes 13 , such as membrane manufacture [14][15][16][17] . The use of these materials for fuel cell electrodes has also been demonstrated 13,18 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution During the Sintering of Freeze-Cast Alumina

Athayde,

Lima,

Weidler

et al. 2024

Mat. Res.

View full text Add to dashboard Cite

Reports on freeze-cast ceramic materials frequently focus on the study of the organized macroporosity and the properties of the materials. This study aims to describe the microstructure evolution of freeze-cast alumina during the sintering process, analyzing grain growth, densification, pore elimination and crystal structure at different sintering temperatures (1300-1500 °C). Aqueous suspensions with 20 vol% alumina were freeze-cast in liquid N 2 and sintered. The microstructure was analyzed by stereological analysis, N 2 adsorption and X-ray diffraction. Grain sizes varied within 237-500 nm, and the intergranular porosity decreased from 8.8% at 1300 °C to 1.4% at 1500 °C. N 2 isotherm analysis revealed pore shrinking from the region of macro and mesopores (20-80 nm), to smaller residual mesopores (3.7-15 nm) at temperatures above 1400 °C. Rietveld refinement of the XRD diffractograms confirmed increased crystallite size and decreased lattice strain at higher sintering temperatures. This comprehensive description of microstructural evolution of the freeze-cast alumina contributes to understanding the sintering of highly porous ceramics produced via freeze-casting.

show abstract

“…Three of the papers of this issue are focused on demonstrating the benefits of ice-templating for specific applications. Gaudillere et al [8] investigated how ice-templating can be used to prepare oxygen permeation asymmetric tubular membrane. This particular application has been identified as promising for ice-templated ceramics, with studies reported from different groups [9,10].…”

mentioning

confidence: 99%