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Hierarchical porous SiOC via freeze casting and self-assembly of block copolymers

Kuo, Taijung and Rueschhoff, Lisa M. and Dickerson, Matthew B. and Patel, Tulsi A. and Faber, Katherine T. (2021) Hierarchical porous SiOC via freeze casting and self-assembly of block copolymers. Scripta Materialia, 191 . pp. 204-209. ISSN 1359-6462.

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Surface area, permeability, and mechanical robustness are particularly crucial for porous ceramics utilized in filter and catalyst support applications. Unfortunately, these desirable properties are often inversely related to one another via porosity and pore size, creating a serious challenge in the optimization of these materials. To address this challenge, we propose a hierarchical porous composite, fabricated by freeze casting preceramic polymers and re-infiltrating with a self-assembling preceramic polymer/block copolymer blend. The resulting pyrolyzed SiOC hierarchical solid displayed a bimodal pore size distribution with macropores from the freeze-cast structure and mesopores in the self-assembled coating. Neither permeability, compressive strength, nor Young's modulus of the porous composite were compromised with the mesoporous conformal coatings. With the presented hierarchical structure, a better filtration material is expected with higher throughput and reaction rates. Furthermore, by adopting a two-step process, macropores and mesopores can be individually tuned to optimize structures for desired applications.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kuo, Taijung0000-0002-3720-968X
Rueschhoff, Lisa M.0000-0001-6503-5704
Patel, Tulsi A.0000-0002-6156-2248
Faber, Katherine T.0000-0001-6585-2536
Additional Information:© 2020 Acta Materialia Inc. Published by Elsevier Ltd. Received 19 August 2020, Revised 22 September 2020, Accepted 25 September 2020, Available online 5 October 2020. TK is supported by the J. Yang & Family Foundation, and with KTF, by the National Science Foundation through DMR-1411218. MBD and LMR acknowledge support from the Air Force Research Laboratory, Materials & Manufacturing Directorate. MBD additionally acknowledges support by the Air Force Office of Scientific Research, Aerospace Composite Materials Portfolio. TAP was supported by an NRC Research Associateship award at the Air Force Research Laboratory. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. SEM work was performed in the Division of Geology and Planetary Science Analytical Facility at Caltech. X-ray computed tomography was executed at the Materials and Manufacturing Directorate at AFRL. We thank Dr. Channing C. Ahn for advice and use of the TriStar II 3020.
Funding AgencyGrant Number
J. Yang and Family FoundationUNSPECIFIED
Air Force Research Laboratory (AFRL)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Subject Keywords:freeze casting; porous material; polymer-derived ceramics; nanostructure; permeability
Record Number:CaltechAUTHORS:20201019-100031049
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Official Citation:Taijung Kuo, Lisa M. Rueschhoff, Matthew B. Dickerson, Tulsi A. Patel, Katherine T. Faber, Hierarchical porous SiOC via freeze casting and self-assembly of block copolymers, Scripta Materialia, Volume 191, 2021, Pages 204-209, ISSN 1359-6462, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106140
Deposited By: Tony Diaz
Deposited On:20 Oct 2020 16:08
Last Modified:20 Oct 2020 16:08

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