Freeze casting of novel porous silicate cement supports using tert-butyl alcohol-water binary crystals as template: Microstructure, strength and permeability

Dong, Senjie; Wang, Leyi; Gao, Xueli; Zhu, Wenzhuo; Wang, Zhen; Ma, Zhen; Gao, Congjie

doi:10.1016/j.memsci.2017.06.067

Cited by 28 publications

(19 citation statements)

References 53 publications

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“…[ 23,24,33,34,42–44 ] Recent attempts have also been devoted in ice‐templating cement materials. [ 45,46 ] It is critical for preserving the ice‐templated architectures by avoiding the collapse or re‐melting of the frozen body during the removal of ice. This invariably necessitates a freeze‐drying treatment to sublimate the ice, which requires long time processing of evacuation combined with refrigeration.…”

Section: Discussionmentioning

confidence: 99%

“…[ 24 ] For example, it typically takes more than 3 days to achieve an adequate drying of laboratory‐scale samples of tens of millimeters in dimension. [ 42–46 ] The considerable energy consumption and time cost, together with the strict size limit by the vacuum chamber for freeze drying, make the ice‐templating technique inapplicable for the mass production in engineering. Additionally, in general the freeze‐dried green bodies need to be strengthened by adding certain amounts of organic adhesives.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, in general the freeze‐dried green bodies need to be strengthened by adding certain amounts of organic adhesives. [ 23,45,46 ] These organics are often removed via extra operation, e.g., high‐temperature heat treatment, which further complicates the fabrication process. The above problems are solved here by utilizing the unique self‐hardening behavior of cement through its in situ hydration reactions with water from the melted ice during the thawing process.…”

Section: Discussionmentioning

confidence: 99%

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Wood‐Inspired Cement with High Strength and Multifunctionality

Wang

Jiao

et al. 2020

Advanced Science

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Taking lessons from nature offers an increasing promise toward improved performance in man‐made materials. Here new cement materials with unidirectionally porous architectures are developed by replicating the designs of natural wood using a simplified ice‐templating technique in light of the retention of ice‐templated architectures by utilizing the self‐hardening nature of cement. The wood‐like cement exhibits higher strengths at equal densities than other porous cement‐based materials along with unique multifunctional properties, including effective thermal insulation at the transverse profile, controllable water permeability along the vertical direction, and the easy adjustment to be water repulsive by hydrophobic treatment. The strengths are quantitatively interpreted by discerning the effects of differing types of pores using an equivalent element approach. The simultaneous achievement of high strength and multifunctionality makes the wood‐like cement promising for applications as new building materials, and verifies the effectiveness of wood‐mimetic designs in creating new high‐performance materials. The simple fabrication procedure by omitting the freeze‐drying treatment can also promote a better efficiency of ice‐templating technique for the mass production in engineering and may be extended to other material systems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Wood‐Inspired Cement with High Strength and Multifunctionality

Wang

Jiao

et al. 2020

Advanced Science

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“…The different solvent used to prepare the slurry for freeze-casting will produce different pore structures [158]. Cement membranes fabricated, using water and tert-butanol as a solvent, have presented different pore size, porosity, and mechanical strength [159].…”

Section: Methodsmentioning

confidence: 99%

“…Fabrication of cement membrane using the freeze-casting method (reproduced from ref. [159] with permission from Elsevier).…”

Section: Figurementioning

confidence: 99%

Materials and Applications for Low-Cost Ceramic Membranes

2019

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In water treatment applications, the use of ceramic membranes is associated with numerous advantages relative to polymer-based filtration systems. High-temperature stability, fouling resistance, and low maintenance requirements contribute to lower lifecycle costs in such systems. However, the high production costs of most commercially available ceramic membranes, stemming from raw materials and processing, are uneconomical for such systems in most water treatment applications. For this reason, there is a growing demand for new ceramic membranes based on low-cost raw materials and processes. The use of unrefined mineral feedstocks, clays, cement, sands, and ash as the basis for the fabrication of ceramic membranes offers a promising pathway towards the obtainment of effective filtration systems that can be economically implemented in large volumes. The design of effective ceramic filtration membranes based on low-cost raw materials and energy-efficient processes requires a balance of pore structure, mass flow, and robustness, all of which are highly dependent on the composition of materials used, the inclusion of various pore-forming and binding additives, and the thermal treatments to which membranes are subjected. In this review, we present recent developments in materials and processes for the fabrication of low-cost membranes from unrefined raw materials, including clays, zeolites, apatite, waste products, including fly ash and rice husk ash, and cement. We examine multiple aspects of materials design and address the challenges relating to their further development.

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