Production of Porous Materials by Supercritical Carbon Dioxide Drying

超临界二氧化碳干燥法生产多孔材料

• 批准号: 07555551
• 负责人: MASUOKA Hirokatsu
• 金额: $ 1.41万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555551/
• 关键词: Supercritical Drying; Drying; Silica Aerogel; Porous Material

Drying of silica alcogels using supercritical carbon dioxide was carried out at various conditions to investigate the optimal drying conditions for samples with different sizes. From the experiments it was found that a non-equilibrium interface that appeared in fluid phase in some gels, while the tem perature had a minor influence on the time. An increase in the sample thickness affected all stages of the drying process seriously, resulting in longer drying times. Hydrophobic modification of silanol groups on the gels was also performed in the middle of the supercritical drying process using three methylmethoxysilanes. The effects of the hydrophobic modification were evaluated by measuring water adsorption. The aerogel samples modified with methyltrimethoxysilane in the supercritical fluid phase showed higher hydrophobictiy than those modified in the liquid phase prior to the supercritical drying process.

采用超临界CO2对硅胶醇凝胶进行干燥，考察了不同粒径硅胶醇凝胶的最佳干燥条件。实验发现，在某些凝胶中，液相中出现了非平衡界面，温度对时间的影响较小。样品厚度的增加严重影响了干燥过程的各个阶段，导致干燥时间延长。凝胶上的硅烷醇基团的疏水改性也在超临界干燥过程中使用三个甲基甲氧基硅烷进行。疏水改性的效果进行了评估，通过测量水吸附。在超临界流体相中用甲基三甲氧基硅烷改性的气凝胶样品显示出比在超临界干燥过程之前在液相中改性的那些更高的疏水性。

项目成果

横川 弘: "透明断熱材としての疎水性シリカエアロゲル" 第16回日本熱物性シンポジウム講演論文集. 16. 261-264 (1995)

横河浩：“疏水性二氧化硅气凝胶作为透明绝热材料”第 16 届日本热物理性能研讨会论文集 16. 261-264 (1995)。

Shigeki Takishima: "Production of Silica Aerogels by Supercritical CO_2 Drying" The 4th International Symposium on Supercritical Fluids. (1997)

Shigeki Takishima：“超临界CO_2干燥生产二氧化硅气凝胶”第四届国际超临界流体研讨会。

Shigeki Takishima, Yasuhiro Suzuki, Yasuyuki Konishi, Satoshi Ohmori, Yoshiyuki Sato, Hirokatsu Masuoka: ""Production of Silica Aerogels by Supercritical CO_2 Drying"" The 4th International Symposium on Supercritical Fluids.(in Press). (1997)

Shigeki Takishima、Yasuhiro Suzuki、Yasuyuki Konishi、Satoshi Ohmori、Yoshiyuki Sato、Hirokatsu Masuoka：““超临界 CO_2 干燥生产二氧化硅气凝胶””第四届超临界流体国际研讨会。（正在出版）。

横川弘: "透明断熱材としての疎水性シリカエアロゲル" 第16回日本熱物性シンポジウム講演論文集. 16. 261-264 (1995)

横河浩：“疏水性二氧化硅气凝胶作为透明绝热材料”第 16 届日本热物理性能研讨会论文集 16. 261-264 (1995)。

Hiroshi Yokogawa, Masaru Yokoyama, Hirokatsu Masuoka, Shigeki Takishima, Takayuki Sumiyoshi: ""Fydrophobic silica Aerogel for Transparent Insulation Material"" Proceedings of the Sixteenth Japan Symposium on Thermophysical Properties. 16. 261-264 (1995)

Hiroshi Yokokawa、Masaru Yokoyama、Hirokatsu Masuoka、Shigeki Takishima、Takayuki Sumiyoshi：““用于透明绝缘材料的疏水二氧化硅气凝胶””第十六届日本热物理性能研讨会论文集。