Unidirectional solution-based freeze cast polymer-derived ceramics: influence of freezing conditions and templating solvent on capillary transport in isothermal wicking

Schumacher, Daniel; Braun, Pedro Henrique da Rosa; Wilhelm, Michaela; Rezwan, Kurosch

doi:10.1007/s10853-019-04310-0

Cited by 5 publications

(5 citation statements)

References 31 publications

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“…11). 167,168 Common casting methods include sol-gel processing, 169 solvent casting, 170 and freeze casting. 171,172 The structure of the adsorbent synthesized by casting is dependent on the mold shape, and in most cases, it is a cylindrical, cubic, annular monolith or lm.…”

Section: Shaping Techniques To Fabricate Structured Adsorbentsmentioning

confidence: 99%

Shaping techniques of adsorbents and their applications in gas separation: a review

Zhu

Yang

et al. 2022

J. Mater. Chem. A

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Section: Shaping Techniques To Fabricate Structured Adsorbentsmentioning

confidence: 99%

Shaping techniques of adsorbents and their applications in gas separation: a review

Zhu

Yang

et al. 2022

J. Mater. Chem. A

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“…Numerous experimental and simulated data can be found in the literature where metallic screens have been tested under Earth gravity conditions and in microgravity environments [ 13 , 14 , 15 , 16 , 17 ]. After two initial papers dealing with the applicability of porous SiOC monoliths for isothermal/cryogenic wicking [ 18 , 19 ], there are, to the authors’ knowledge, no data reported on the further development of these materials into crack-free SiOC as SC-LADs, the correlation of experimental results with the pore structure, or an analytical solution. The absence of the application of SiOC screens in relevant engineering fields of application can be attributed to the natural brittleness of porous ceramics and the challenge of producing crackless porous ceramics that allow particle-free phase separation.…”

Section: Introductionmentioning

confidence: 99%

“…By choosing different solvents, one can develop dendritic, lamellar, prismatic, or honeycomb-like pore morphologies [ 33 , 34 ]. Previous studies have depicted the influence of different pore morphologies of SiOC ceramics on wicking transport [ 19 ]. In addition to the ability to transport liquids, the dendritic pore structure exhibits increased mechanical stability [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

et al. 2023

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The development of porous ceramic screens with high chemical stability, low density, and thermal conductivity can lead to promising screen channel liquid acquisition devices (SC-LADs) for propellant management under microgravity conditions in the future. Therefore, SiOC screens with aligned pores were fabricated via freeze-casting and applied as a SC-LAD. The pore window sizes and open porosity varied from 6 µm to 43 µm and 65 % or 79 %, depending on the freezing temperature or the solid loading, respectively. The pore window size distributions and bubble point tests indicate crack-free screens. On the one hand, SC-LADs with an open porosity of 79 % removed gas-free liquid up to a volumetric flow rate of 4 mL s−1. On the other hand, SC-LADs with an open porosity of 65 % were limited to 2 mL s−1 as the pressure drop across these screens was relatively higher. SC-LADs with the same open porosity but smaller pore window sizes showed a higher pressure drop across the screen and bubble ingestion at higher values of effective screen area when increasing the applied removal volumetric flow rate. The removed liquid from the SC-LADs was particle-free, thus representing a potential for applications in a harsh chemical environment or broad-range temperatures.

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“…Another approach to synthesize porous PDC monoliths is that a porous preceramic polymer monolith with crosslinked networks is first prepared typically by sol-gel process, which is subsequently subjected to ceramization and crystallization preserving the inherent porous structure. The synthetic pathways are predominantly based on sol-gel reactions for porous precursor gels associated with supercritical drying (i.e., aerogels), [43][44][45][46][47] freeze casting, [62][63][64][65] foaming, 6 emulsion, 8 templating, [49][50][51][52] and phase separation method. [83][84][85] In particular, the sol-gel process accompanied by spinodal decomposition can tailor the so-called cocontinuous structure (also denoted as bicontinuous structure), where the discrete pore and polymeric skeleton are 3-D interconnected in a monolithic gel (see Panel A).…”

Section: Introductionmentioning

confidence: 99%

“…Among the materials prepared by the preceramic polymer route, porous ceramics in a monolithic form have been the most notably developed in the past few decades 43–78 . The templating technique is one of the most common means to prepare porous materials, and the same holds for PDC monoliths.…”

Section: Introductionmentioning

confidence: 99%

Porous polymer‐derived ceramics: Flexible morphological and compositional controls through sol–gel chemistry

2021

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Porous nonoxide ceramics have exhibited impressive progress in terms of synthesis and applications over the past few decades because of their unique characteristics distinguished from the oxide counterparts. From the synthetic aspect, the preceramic polymer route, where nonoxide ceramics such as carbides and nitrides are produced from molecular precursors, offers exceptional opportunities to elaborate and control the material shape as well as the micro‐ and nanostructures in concert with various techniques. This review presents monolithic ceramic materials based on various reduced phases bearing hierarchical porosity with a focus on those obtained from macroporous preceramic monoliths prepared via the one‐pot sol–gel process accompanied by spinodal decomposition. Here, we highlight two classes of preceramic inorganic–organic hybrid gels: organometallic crosslinked polymers based on poly(silsesquioxane)s and nonorganometallic hybrid networks related to Ti without Ti–C bonds. The polymer‐to‐ceramic conversion processes are discussed with concern for the crystal transition behaviors and the variation of pore properties in different length scales upon heating. In addition, although out of the preceramic polymer category, some examples of inorganic–organic nanocomposite gels with a carbonizable polymer and/or urea for yielding porous metal carbides and nitrides in a monolithic form are introduced as well, which provides extended versatility toward a variety of transition metal systems.

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Unidirectional solution-based freeze cast polymer-derived ceramics: influence of freezing conditions and templating solvent on capillary transport in isothermal wicking

Cited by 5 publications

References 31 publications

Shaping techniques of adsorbents and their applications in gas separation: a review

Shaping techniques of adsorbents and their applications in gas separation: a review

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

Porous polymer‐derived ceramics: Flexible morphological and compositional controls through sol–gel chemistry

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