Freeze‐cast honeycomb structures via gravity‐enhanced convection
The effect of gravity on directional solidification was investigated in solution‐based freeze casting. A preceramic siloxane‐based polymer was freeze‐cast with a cyclohexene solvent from two different directions: that against the direction of the gravitational force and that in concert with the grav...
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| Veröffentlicht in: | Journal of the American Ceramic Society 2021-09, Vol.104 (9), p.4309-4315 |
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| container_title | Journal of the American Ceramic Society |
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| creator | Arai, Noriaki Faber, Katherine T. |
| description | The effect of gravity on directional solidification was investigated in solution‐based freeze casting. A preceramic siloxane‐based polymer was freeze‐cast with a cyclohexene solvent from two different directions: that against the direction of the gravitational force and that in concert with the gravitational force. Because the density of preceramic polymer is higher than the solvent, the segregated polymer creates a denser solution ahead of the freezing front than the underlying solution when the freezing direction is the same as the gravity direction. This results in convective flow in the liquid phase. This convective flow influences constitutional supercooling, which changes not only the pore size of freeze‐cast structure but also the pore morphology from dendritic to cellular pores.
Conventional directional (upward) and convection‐enhanced (downward) freeze‐casting setups produce contrasting pore size and morphology in porous solids. |
| doi_str_mv | 10.1111/jace.17871 |
| format | Article |
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Conventional directional (upward) and convection‐enhanced (downward) freeze‐casting setups produce contrasting pore size and morphology in porous solids.</description><identifier>ISSN: 0002-7820</identifier><identifier>EISSN: 1551-2916</identifier><identifier>DOI: 10.1111/jace.17871</identifier><language>eng</language><publisher>Columbus: Wiley Subscription Services, Inc</publisher><subject>Cellular structure ; Convective flow ; Dendritic structure ; Directional solidification ; Freezing ; Gravitational effects ; Honeycomb structures ; Liquid phases ; Morphology ; polymer precursor ; Polymers ; Pore size ; porous materials ; silicon oxycarbide ; Siloxanes ; Solvents ; Supercooling</subject><ispartof>Journal of the American Ceramic Society, 2021-09, Vol.104 (9), p.4309-4315</ispartof><rights>2021 The American Ceramic Society</rights><rights>2021 American Ceramic Society</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3371-d0593f9b89618924cbc1b765fb49f9182ba2c64f0dea2b09f3e1608735857d83</citedby><cites>FETCH-LOGICAL-c3371-d0593f9b89618924cbc1b765fb49f9182ba2c64f0dea2b09f3e1608735857d83</cites><orcidid>0000-0001-6585-2536 ; 0000-0002-3040-2997</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2Fjace.17871$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fjace.17871$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids></links><search><creatorcontrib>Arai, Noriaki</creatorcontrib><creatorcontrib>Faber, Katherine T.</creatorcontrib><title>Freeze‐cast honeycomb structures via gravity‐enhanced convection</title><title>Journal of the American Ceramic Society</title><description>The effect of gravity on directional solidification was investigated in solution‐based freeze casting. A preceramic siloxane‐based polymer was freeze‐cast with a cyclohexene solvent from two different directions: that against the direction of the gravitational force and that in concert with the gravitational force. Because the density of preceramic polymer is higher than the solvent, the segregated polymer creates a denser solution ahead of the freezing front than the underlying solution when the freezing direction is the same as the gravity direction. This results in convective flow in the liquid phase. This convective flow influences constitutional supercooling, which changes not only the pore size of freeze‐cast structure but also the pore morphology from dendritic to cellular pores.
Conventional directional (upward) and convection‐enhanced (downward) freeze‐casting setups produce contrasting pore size and morphology in porous solids.</description><subject>Cellular structure</subject><subject>Convective flow</subject><subject>Dendritic structure</subject><subject>Directional solidification</subject><subject>Freezing</subject><subject>Gravitational effects</subject><subject>Honeycomb structures</subject><subject>Liquid phases</subject><subject>Morphology</subject><subject>polymer precursor</subject><subject>Polymers</subject><subject>Pore size</subject><subject>porous materials</subject><subject>silicon oxycarbide</subject><subject>Siloxanes</subject><subject>Solvents</subject><subject>Supercooling</subject><issn>0002-7820</issn><issn>1551-2916</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp90EtOwzAQBmALgUQpbDhBJHZIKR47D3tZlZaHKrHp3nKcMU3VxsVOisKKI3BGTkJKWDOb0UjfzEg_IddAJ9DX3UYbnEAucjghI0hTiJmE7JSMKKUszgWj5-QihE0_ghTJiNwvPOIHfn9-GR2aaO1q7IzbFVFofGua1mOIDpWOXr0-VE3XO6zXujZYRsbVBzRN5epLcmb1NuDVXx-T1WK-mj3Gy5eHp9l0GRvOc4hLmkpuZSFkBkKyxBQGijxLbZFIK0GwQjOTJZaWqFlBpeUIGRU5T0Wal4KPyc1wdu_dW4uhURvX-rr_qFiaZTThIHmvbgdlvAvBo1V7X-207xRQdQxJHUNSvyH1GAb8Xm2x-0eq5-lsPuz8AG6Ia0I</recordid><startdate>202109</startdate><enddate>202109</enddate><creator>Arai, Noriaki</creator><creator>Faber, Katherine T.</creator><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope><orcidid>https://orcid.org/0000-0001-6585-2536</orcidid><orcidid>https://orcid.org/0000-0002-3040-2997</orcidid></search><sort><creationdate>202109</creationdate><title>Freeze‐cast honeycomb structures via gravity‐enhanced convection</title><author>Arai, Noriaki ; Faber, Katherine T.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3371-d0593f9b89618924cbc1b765fb49f9182ba2c64f0dea2b09f3e1608735857d83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Cellular structure</topic><topic>Convective flow</topic><topic>Dendritic structure</topic><topic>Directional solidification</topic><topic>Freezing</topic><topic>Gravitational effects</topic><topic>Honeycomb structures</topic><topic>Liquid phases</topic><topic>Morphology</topic><topic>polymer precursor</topic><topic>Polymers</topic><topic>Pore size</topic><topic>porous materials</topic><topic>silicon oxycarbide</topic><topic>Siloxanes</topic><topic>Solvents</topic><topic>Supercooling</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Arai, Noriaki</creatorcontrib><creatorcontrib>Faber, Katherine T.</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of the American Ceramic Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Arai, Noriaki</au><au>Faber, Katherine T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Freeze‐cast honeycomb structures via gravity‐enhanced convection</atitle><jtitle>Journal of the American Ceramic Society</jtitle><date>2021-09</date><risdate>2021</risdate><volume>104</volume><issue>9</issue><spage>4309</spage><epage>4315</epage><pages>4309-4315</pages><issn>0002-7820</issn><eissn>1551-2916</eissn><abstract>The effect of gravity on directional solidification was investigated in solution‐based freeze casting. A preceramic siloxane‐based polymer was freeze‐cast with a cyclohexene solvent from two different directions: that against the direction of the gravitational force and that in concert with the gravitational force. Because the density of preceramic polymer is higher than the solvent, the segregated polymer creates a denser solution ahead of the freezing front than the underlying solution when the freezing direction is the same as the gravity direction. This results in convective flow in the liquid phase. This convective flow influences constitutional supercooling, which changes not only the pore size of freeze‐cast structure but also the pore morphology from dendritic to cellular pores.
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| subjects | Cellular structure Convective flow Dendritic structure Directional solidification Freezing Gravitational effects Honeycomb structures Liquid phases Morphology polymer precursor Polymers Pore size porous materials silicon oxycarbide Siloxanes Solvents Supercooling |
| title | Freeze‐cast honeycomb structures via gravity‐enhanced convection |
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