María Reyes-Peces , Beatriz Amaya-Dolores , Víctor Morales-Flórez , Desirée de-los-Santos , María del Mar Mesa , Luis Esquivias , Nicolás de-la-Rosa-Fox , Manuel Piñero
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引用次数: 0
摘要
有机-无机混合气凝胶是一种高度疏水的多孔固体，可避免标准二氧化硅气凝胶的脆性和吸湿性。超疏水性多孔材料能够选择性地吸收有机溶剂，同时排斥水分，是修复技术的绝佳候选材料，因此引起了人们的极大兴趣。这项研究比较了 DEDMS/TEOS（二乙氧基二甲基硅烷/四乙基正硅酸酯）凝胶的三种干燥过程，即超临界二氧化碳干燥、超临界乙醇干燥和常温干燥。超临界二氧化碳和常温干燥产生了超疏水气凝胶（θ >150°），而超临界乙醇干燥产生的气凝胶更致密，多孔体积和比表面积都更小。关于有机液体的吸收，在所有情况下都能观察到膨胀现象。正己烷的扩散速度较快，符合费克定律（∝t0.5），而液态聚二甲基硅氧烷的非费克扩散过程较慢（∝tn, n < 0.5）。
Effect of the drying procedure on hybrid sono-aereogels for organic solvent remediation
Hybrid organic–inorganic aerogels are highly hydrophobic porous solids that avoid the brittleness and moisture adsorption of the standard silica aerogels. Superhydrophobic porous materials have attracted great interest because of their ability for selective absorption of organic solvents while repelling water, as excellent candidates for remediation techniques. This work shows a comparative of three drying procedures of DEDMS/TEOS (diethoxydimethylsilane/tetraethylorthosilicate) gels, namely, by supercritical CO2, by supercritical ethanol, and dried at ambient conditions. Supercritical CO2 and ambient drying produced superhydrophobic aerogels (θ > 150°), while supercritical ethanol drying produces denser aerogels with smaller both porous volume and specific surface area. Regarding the absorption of organic liquids, swelling is observed in all cases. Hexane had faster diffusion that obeyed Fick's law (∝t0.5) whereas liquid polydimethylsiloxane exhibited slower non-Fickian diffusion process (∝tn, n < 0.5).
期刊介绍：
The Journal of the Spanish Ceramic and Glass Society publishes scientific articles and communications describing original research and reviews relating to ceramic materials and glasses. The main interests are on novel generic science and technology establishing the relationships between synthesis, processing microstructure and properties of materials. Papers may deal with ceramics and glasses included in any of the conventional categories: structural, functional, traditional, composites and cultural heritage. The main objective of the Journal of the Spanish Ceramic and Glass Society is to sustain a high standard research quality by means of appropriate reviewing procedures.
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