# Boehmite Nanofiber–Polymethylsilsesquioxane Composite Aerogels: Synthesis, Analysis, and Thermal Conductivity Control via Compression Processing https://mdr.nims.go.jp/datasets/4dc77bf1-7c1b-4213-9249-3d72976ae1ff ## File - [BCSJ2021_postprint.pdf](https://mdr.nims.go.jp/filesets/8060735a-974b-460e-82b8-849a39f0c2a0/download) ([Detail](https://mdr.nims.go.jp/filesets/8060735a-974b-460e-82b8-849a39f0c2a0.md)) ## Id 4dc77bf1-7c1b-4213-9249-3d72976ae1ff ## Local identifier ## Visibility open_to_public ## State published ## Created at 2024-06-03T06:12:34.535939Z ## Updated at 2024-08-20T07:30:32.663113Z ## Published at 2024-08-20T07:30:32.743458Z ## Doi https://doi.org/10.48505/nims.4666 ## First published url https://doi.org/10.1246/bcsj.20200205 ## Date published 2021-01-15 ## Recorded date published 2021-1-15 ## Resource type journal_article ## Manuscript type accepted_manuscript ## Collection ## Title - title: 'Boehmite Nanofiber–Polymethylsilsesquioxane Composite Aerogels: Synthesis, Analysis, and Thermal Conductivity Control via Compression Processing' title_type: original lang: en ## Description - description: ベーマイトナノファイバーとポリメチルシルセスキオキサン（PMSQ）を複合化したエアロゲルの構造と物性の関係を調べた。3官能性有機ケイ素アルコキシドであるメチルトリメトキシシラン（MTMS）をベーマイトナノファイバー水分散液に添加し、ナノファイバーをPMSQで被覆および結合させることで、透明から半透明の湿潤ゲルモノリスを作製した。この湿潤ゲルを超臨界二酸化炭素乾燥して低嵩密度のエアロゲルパネルを得た。この材料に対し、力学試験と熱伝導率測定を行った。出発組成に含まれるMTMSの量を増加させると、PMSQで被覆された繊維状モノリスの骨格が厚くなり、それに伴いヤング率が上昇、熱伝導率は低下した。MTMSの添加量が少ない場合、半透明のパネルは一軸圧縮による変形が可能であり、30%の圧縮後に熱伝導率は19%抑制された。材料作製後の圧縮変形による熱伝導率制御は、将来の断熱材開発での応用可能性を持つ。 description_type: abstract lang: und - description: The relationship between structure and physical properties of aerogels composed of boehmite nanofibers and polymethylsilsesquioxane (PMSQ) was investigated. By adding methyltrimethoxysilane (MTMS), a trifunctional organosilicon alkoxide, to an aqueous dispersion of boehmite nanofibers and coating and bonding the nanofibers with PMSQ, transparent to translucent wet gel monoliths were prepared. To obtain low bulk density aerogel panels, the wet gel was dried with supercritical carbon dioxide. Mechanical tests and thermal conductivity measurements were performed on this material. As the amount of MTMS in the starting composition was increased, the PMSQ-coated fibrous skeletons became thicker, with a corresponding increase in Young's modulus and decrease in thermal conductivity. On the other hand, when the amount of MTMS added was small, the translucent panels could be deformed by uniaxial compression. The thermal conductivity was suppressed by 19% after 30% compression. The control of thermal conductivity by compressive deformation after material fabrication has potential applications in the development of future insulation materials. description_type: abstract lang: en - description: ベーマイトナノファイバーとポリメチルシルセスキオキサン（PMSQ）を複合化したエアロゲルの構造と物性の関係を調べた。3官能性有機ケイ素アルコキシドであるメチルトリメトキシシラン（MTMS）をベーマイトナノファイバー水分散液に添加し、ナノファイバーをPMSQで被覆および結合させることで、透明から半透明の湿潤ゲルモノリスを作製した。この湿潤ゲルを超臨界二酸化炭素乾燥して低嵩密度のエアロゲルパネルを得た。この材料に対し、力学試験と熱伝導率測定を行った。出発組成に含まれるMTMSの量を増加させると、PMSQで被覆された繊維状モノリスの骨格が厚くなり、それに伴いヤング率が上昇、熱伝導率は低下した。MTMSの添加量が少ない場合、半透明のパネルは一軸圧縮による変形が可能であり、30%の圧縮後に熱伝導率は19%抑制された。材料作製後の圧縮変形による熱伝導率制御は、将来の断熱材開発での応用可能性を持つ。 description_type: abstract lang: und - description: The relationship between structure and physical properties of aerogels composed of boehmite nanofibers and polymethylsilsesquioxane (PMSQ) was investigated. By adding methyltrimethoxysilane (MTMS), a trifunctional organosilicon alkoxide, to an aqueous dispersion of boehmite nanofibers and coating and bonding the nanofibers with PMSQ, transparent to translucent wet gel monoliths were prepared. To obtain low bulk density aerogel panels, the wet gel was dried with supercritical carbon dioxide. Mechanical tests and thermal conductivity measurements were performed on this material. As the amount of MTMS in the starting composition was increased, the PMSQ-coated fibrous skeletons became thicker, with a corresponding increase in Young's modulus and decrease in thermal conductivity. On the other hand, when the amount of MTMS added was small, the translucent panels could be deformed by uniaxial compression. The thermal conductivity was suppressed by 19% after 30% compression. The control of thermal conductivity by compressive deformation after material fabrication has potential applications in the development of future insulation materials. description_type: abstract lang: en ## Creator - name: Gen Hayase role: author orcid: https://orcid.org/0000-0003-1970-6129 organization: National Institute for Materials Science ## Contact agent ## Publisher organization: The Chemical Society of Japan ## Managing organization ## Keyword - subject: aerogels schema: not_defined - subject: thermal insulation schema: not_defined - subject: composites schema: not_defined ## Rights - description: 'This is a pre-copyedited, author-produced version of an article accepted for publication in Bulletin of the Chemical Society of Japan following peer review. The version of record Gen Hayase, Boehmite Nanofiber–Polymethylsilsesquioxane Composite Aerogels: Synthesis, Analysis, and Thermal Conductivity Control via Compression Processing, Bulletin of the Chemical Society of Japan, Volume 94, Issue 1, January 2021, Pages 70–75 is available online at: https://doi.org/10.1246/bcsj.20200205' identifier: http://rightsstatements.org/vocab/InC/1.0/ ## Other identifier(s) ## Data origin - data_origin_type: other ## Embargo start_date: 2020-08-29 end_date: 2021-08-29 ## Journal - title: Bulletin of the Chemical Society of Japan issn: '13480634' volume: '94' issue: '1' start_page: 70 end_page: 75 ## Conference ## Related item ## Funding - funder_name: Ministry of Education, Culture, Sports, Science and Technology - identifier: 17K14541 funder_name: Japan Society for the Promotion of Science description: ナノファイバーを骨格にもつ塊状柔軟マクロ多孔体の圧縮変形と構造・物性制御 ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: 8060735a-974b-460e-82b8-849a39f0c2a0 filename: BCSJ2021_postprint.pdf content_type: application/pdf size: 962237 md5: '085d722cd263e73deea78a8b2c2d9b24' ## Thumbnail fileset_id: 8060735a-974b-460e-82b8-849a39f0c2a0 filename: BCSJ2021_postprint.pdf