AC electric field-assisted fabrication of ice-templated alumina materials and remarkable enhancement of compressive strength

Akurati, Sashanka; Qian, Shizhi; Ghosh, Dipankar

doi:10.1016/j.scriptamat.2021.114264

Cited by 6 publications

(9 citation statements)

References 14 publications

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“…For ice-templated ceramic materials, it has been shown that strength decreases as morphology changes from dendritic to lamellar. 9,[13][14][15]20,44,45,47 Therefore, the current results revealed that the role of high C s and FFV was to preserve highly dendritic morphology throughout the ice-templated microstructure in the growth direction of ice crystals, which was beneficial to achieve markedly high compressive strength.…”

Section: Uniaxial Compressive Mechanical Response and Structure-prope...mentioning

confidence: 63%

“…This trend was consistent with the previous studies that also reported that compressive strength increased with FFV due to the decrease in pore size and increase in bridge density. 9,[13][14][15]20,[44][45][46][47] In any series, in LFFV regime, strength increased with C s . In every series, strength increased significantly up to C CT 0.03 g/cm 3 ; however, with a further increase in C CT , strength remained about the same or only marginally increased.…”

Section: Uniaxial Compressive Mechanical Response and Structure-prope...mentioning

confidence: 82%

“…12 Ice-templated microstructure and mechanical properties can be tuned by changing freezing front velocity (FFV, growth velocity of ice crystals), [13][14][15] additive type and concentration, 9,16 and particle size and shape. 14,15 Magnetic field, 17 ultrasound, 18 direct current electric field, 19 and alternating current electric field 20 have also been used to manipulate ice-templated microstructure. Additives are particularly very promising, which depress solvent freezing point, alter growth velocity and surface free energy of solvent crystals, and change viscosity, affecting crystal shape and thus pore size and morphology in the resulting ice-templated materials.…”

Section: Introductionmentioning

confidence: 99%

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Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

et al. 2022

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This work investigated the role of sucrose and cationic dispersant (1‐hexadecyl)trimethylammonium bromide concentration on ice‐templated sintered lithium titanate microstructure and compressive strength, to enable a comprehensive understanding of composition selection and elucidate processing–microstructure–mechanical property relationships. Sucrose and dispersant concentrations were varied to change total solute concentration in suspensions and viscosity. Dispersant was more effective in reducing viscosity than sucrose; however, their combination had an even greater impact on reducing viscosity. Based on viscosity measurements, a total of 12 suspension compositions were developed, and materials were fabricated at two different freezing front velocity (FFV) regimes. Solute concentration greatly influenced ice‐templated microstructure and microstructure development improved with solute concentration. Depending on solute concentration, type of solute, viscosity, and FFV, a wide variety of microstructures were observed ranging from lamellar to dendritic morphologies. Solute concentration effect was rationalized based on solid–liquid planar interface instability. For suspensions with comparable viscosity, solute concentration can be varied to tune microstructure, whereas for suspensions with comparable solute concentration, viscosity variation can tune microstructure. Compressive strength of sintered materials generally increased with total solute concentration, sucrose concentration, viscosity, and FFV. Due to the wide variety of microstructure, strength also varied over a wide range, 23–128 MPa.

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Section: Uniaxial Compressive Mechanical Response and Structure-prope...mentioning

confidence: 63%

Section: Uniaxial Compressive Mechanical Response and Structure-prope...mentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

et al. 2022

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“…32 Other options for strength enhancement include the use of magnetic and electric fields. 42,43 While the research described above suggests promising electrochemical properties and mechanisms to improve mechanical properties of ice-templated multifunctional electrodes, the influence of electrochemical cycling on the mechanical properties of sintered electrodes has not yet been investigated. In this initial study of cycling influences on the microstructure and mechanical properties of sintered electrodes, LTO was chosen as the anode material, which would be expected to retain mechanical properties due to its minimal volume change during electrochemical cycling.…”

Section: Introductionmentioning

confidence: 99%

“…The authors have used sucrose (water‐soluble additive) to fabricate ice‐templated sintered LTO materials, which increased the bridge density and enhanced compressive strength 32 . Other options for strength enhancement include the use of magnetic and electric fields 42,43 …”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of electrochemically cycled ice‐templated Li ₄ Ti ₅ O ₁₂ sintered anodes

Parai

Nie

Ghosh

et al. 2022

Intl J of Energy Research

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Summary In the development of materials to meet increasing demands for energy storage, complex materials and systems will need to be investigated. One emerging area is multifunctional energy storage materials, where a battery electrode needs to satisfy other properties in addition to those associated with storing electrochemical energy. An example explored in this report is sintered electrodes for lithium‐ion batteries, where the electrode is only comprised of a porous sintered structure of the electroactive ceramic material. The sintered electrode must be multifunctional in that the porous ceramic itself must sustain the compressive mechanical stresses involved in fabricating the battery cell, as well as the stresses that result during electrochemical charge and discharge cycles. Toward meeting these multifunctional demands, anodes were fabricated using an ice‐templating technique, resulting in directionally porous materials. This study reports the microstructure and compressive mechanical properties of an ice‐templated sintered electrode material both before and after electrochemical cycling, revealing whether electrochemical cycling affects the microstructure and strength. For the specific electroactive material investigated as ice‐templated sintered anodes, the strain with electrochemical cycling was known to be minimal, and the microstructure and compressive strength were found to be retained after multiple charge and discharge cycles. These results suggest multifunctional ice‐templated lithium‐ion battery electrodes can be produced with both high strength and high cell level energy density. Novelty Statement Ice‐templated sintered electrodes are multifunctional battery materials with desirable mechanical and electrochemical properties provided by their unique directionally aligned porous microstructure. This is the first study of these thick and high‐energy electrodes to report mechanical properties both before and after cycling. Microstructure and mechanical properties were retained after electrochemical cycling, suggesting that at least for relatively low strain materials that ice‐templated sintered electrodes are mechanically robust to strain induced by charge/discharge cycling.

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Freeze Casting with Bioceramics for Bone Graft Substitutes

Yin

Naleway

2022

Biomedical Materials & Devices

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Freeze casting with bioceramics affords the opportunity to create the next generation of bone graft substitutes. Because of its versatile material fabrication process and effective methods of structural control, freeze casting helps to meet the many criteria that are required of viable bone graft substitute biomaterials. In combination with biocompatible and resorbable ceramics and ceramic composites that can offer bone growth through osteoconduction, this process helps provide a tailored pore structure while maintaining the necessary mechanical properties for bone growth. Here, the advantages of freeze casting with bioceramics for orthopedic and dental applications are summarized: in particular, these advantages include its compatibility with a large variety of bioceramics, many forms of both uniform and localized structure control, and its ability to be used in combination with other advanced manufacturing processes.

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AC electric field-assisted fabrication of ice-templated alumina materials and remarkable enhancement of compressive strength

Cited by 6 publications

References 14 publications

Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

Microstructure and mechanical properties of electrochemically cycled ice‐templated Li ₄ Ti ₅ O ₁₂ sintered anodes

Freeze Casting with Bioceramics for Bone Graft Substitutes

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AC electric field-assisted fabrication of ice-templated alumina materials and remarkable enhancement of compressive strength

Cited by 6 publications

References 14 publications

Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

Solute concentration effects on microstructure and the compressive strength of ice‐templated sintered lithium titanate

Microstructure and mechanical properties of electrochemically cycled ice‐templated Li 4 Ti 5 O 12 sintered anodes

Freeze Casting with Bioceramics for Bone Graft Substitutes

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About

Microstructure and mechanical properties of electrochemically cycled ice‐templated Li ₄ Ti ₅ O ₁₂ sintered anodes