Freeze-casting of highly porous cellulose-nanofiber-reinforced γ˗Al2O3 monoliths

Hudelja, H.; Konegger, Thomas; Wicklein, Bernd; Čretnik, Janko; Akhtar, Farid; Kocjan, Andraž

doi:10.1016/j.oceram.2021.100069

Cited by 7 publications

(7 citation statements)

References 43 publications

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“…Figure 9 presents the Weibull statistical study, illustrating the dispersion of the stress to rupture of FTC sintered materials. The Weibull modulus values are between 6 and 10, which is within the range for silicate ceramics (5)(6)(7)(8)(9)(10) reported in the literature. 29,38 As mentioned in Section 2.2, images were processed using GIMP software, and two typical examples of a binary image with HCR are shown in Figure 11.…”

Section: Ftc and Tc Materials After Sinteringsupporting

confidence: 79%

“…The FTC process helps in performing the casting of a suspension on a refrigerated plate. According to the literature, freezing allows the growth of more or less large ice crystals depending on the freezing speed and the preservation of the structure of the material 9,10,21 . This process allows to obtain a highly porous texture with a network of pores developed and oriented accordingly to the direction of the freezing front 21–23 …”

Section: Introductionmentioning

confidence: 99%

“…According to the literature, freezing allows the growth of more or less large ice crystals depending on the freezing speed and the preservation of the structure of the material. 9,10,21 This process allows to obtain a highly porous texture with a network of pores developed and oriented accordingly to the direction of the freezing front. [21][22][23] With the current environmental and energy regulations regarding sustainability issues, the need for ecofriendly materials is gaining interest.…”

Section: Introductionmentioning

confidence: 99%

“…Porous ceramics are mainly used as filters and membranes, thermal insulators, fuel cell electrodes, catalyst supports for biomaterials, piezoelectric materials, and acoustically insulating bulk media. 4,7,8 Many different processes have been reported in the literature for manufacturing porous ceramics, such as the gel casting process, 9,10 the organic foam technique, 11 the poreforming agent method, 7,[12][13][14][15][16] and the freeze tape casting (FTC) and tape casting (TC) methods. 9,17,18 Among these techniques, TC is one of the most frequently used method for manufacturing ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

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Properties of phyllosilicate‐based porous ceramics shaped by conventional tape casting and freeze tape casting

Barry

Lecomte‐Nana

Seynou³

et al. 2022

Int J Applied Ceramic Tech

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Silicate ceramics were shaped using tape casting (TC) and freeze tape casting (FTC) processes from three clays labeled HCR, KORS, and KCR. These clays exhibited mass content of 77% halloysite-10 Å, 29% kaolinite, and 98% kaolinite minerals, respectively. After casting the slurries, the dried tapes were sintered at 1200 • C. The microstructure changes were characterized before and after sintering using scanning electron microscopy. The apparent porosity of TC samples was lower (36-47 vol.%) compared to values obtained with FTC samples (67-79 vol.%). The latter samples exhibited a highly textured porosity, with micron-sized pores aligned perpendicular to the tape surfaces. Upon sintering, the porosity of TC samples tended to decrease conversely to the case of FTC samples. Such behavior seemed related to the simultaneous effect of organic additives and ice templating. Consequently, the FTC samples showed a relatively low mechanical strength of 3-7 MPa and thermal conductivity of .14-.22 W m −1 K −1 . After sintering, the mullite crystallization contributed to strengthen the bulk materials, helping to compensate for the detrimental effect of porosity on the stress to rupture and on thermal conductivity values.

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Section: Ftc and Tc Materials After Sinteringsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Properties of phyllosilicate‐based porous ceramics shaped by conventional tape casting and freeze tape casting

Barry

Lecomte‐Nana

Seynou³

et al. 2022

Int J Applied Ceramic Tech

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“…The key attribute that cellulose-based goods provide to a matrix due to their elongated structure is their capacity to enhance mechanical capabilities [31,32]. For instance, enhancing mechanical properties of polymers [29,[33][34][35][36], ceramics [37,38], etc. Aerogels made of chemically cross-linked nanostructured materials based on cellulose can be employed as flexible substrates for a variety of functional nanoparticles, including hydrophobic nutritional supplements and nanoparticles [39,40].…”

Section: Introductionmentioning

confidence: 99%

Cellulose through the Lens of Microfluidics: A Review

Moud

2022

Applied Biosciences

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Cellulose, a linear polysaccharide, is the most common and renewable biopolymer in nature. Because this natural polymer cannot be melted (heated) or dissolved (in typical organic solvents), making complicated structures from it necessitates specialized material processing design. In this review, we looked at the literature to see how cellulose in various shapes and forms has been utilized in conjunction with microfluidic chips, whether as a component of the chips, being processed by a chip, or providing characterization via chips. We utilized more than approximately 250 sources to compile this publication, and we sought to portray cellulose manufacturing utilizing a microfluidic system. The findings reveal that a variety of products, including elongated fibres, microcapsules, core–shell structures and particles, and 3D or 2D structured microfluidics-based devices, may be easily built utilizing the coupled topics of microfluidics and cellulose. This review is intended to provide a concise, visual, yet comprehensive depiction of current research on the topic of cellulose product design and understanding using microfluidics, including, but not limited to, paper-based microfluidics design and implications, and the emulsification/shape formation of cellulose inside the chips.

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Fire‐Retardant and Thermal‐Insulating Cellulose Nanofibril Aerogel Modified by In Situ Supramolecular Assembly of Melamine and Phytic Acid

et al. 2022

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The widespread utilization of cellulose nanofibril (CNF) has been significantly hindered by its inherent flammability. To explore the potential of using CNF aerogel as sustainable material with good fire‐retardant and thermal‐insulating properties, CNF aerogel is modified by in situ supramolecular assembly of melamine (MEL) and phytic acid (PA). This strategy addresses CNF's flammability and avoids the environment issues associated with the incorporation of traditional fire‐retardant. The modified aerogel exhibits highly porous honeycomb structure with low density and good mechanical properties. After modification with MEL–PA, the aerogel exhibits highly improved shape integrity during burning, higher thermal stability, and favorable combustion behavior for fire retardancy. The heat transfer of the modified aerogel is well hindered, which demonstrated effective thermal insulation performance. In view of the excellent thermal and fire‐retardant properties, the MEL–PA/CNF composite aerogel can be a potential fire‐retardant and thermal‐insulating material for applications such as clothing, building, and electronic devices.

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Freeze-casting of highly porous cellulose-nanofiber-reinforced γ˗Al2O3 monoliths

Cited by 7 publications

References 43 publications

Properties of phyllosilicate‐based porous ceramics shaped by conventional tape casting and freeze tape casting

Properties of phyllosilicate‐based porous ceramics shaped by conventional tape casting and freeze tape casting

Cellulose through the Lens of Microfluidics: A Review

Fire‐Retardant and Thermal‐Insulating Cellulose Nanofibril Aerogel Modified by In Situ Supramolecular Assembly of Melamine and Phytic Acid

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