Department of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown Street, Liverpool, L69 7ZD, UK.
Langmuir. 2010 Mar 2;26(5):3186-93. doi: 10.1021/la903120p.
"Dry water" (DW) is a free-flowing powder prepared by mixing water, hydrophobic silica particles, and air at high speeds. We demonstrated recently that DW can be used to dramatically enhance methane uptake rates in methane gas hydrate (MGH). Here, we expand on our initial work, demonstrating that DW can be used to increase the kinetics of formation of gas clathrates for gases other than methane, such as CO(2) and Kr. We also show that the stability of the system toward coalescence can be increased via the inclusion of a gelling agent to form a "dry gel", thus dramatically improving the recyclability of the material. For example, the addition of gellan gum allows effective reuse over at least eight clathration cycles without the need for reblending. DW and its "dry gel" modification may represent a potential platform for recyclable gas storage or gas separation on a practicable time scale in a static, unmixed system.
“干水”（DW）是一种由水、疏水性二氧化硅颗粒和空气在高速下混合而成的自由流动粉末。我们最近证明，DW 可用于显著提高甲烷气体水合物（MGH）中甲烷的吸收速率。在这里，我们扩展了我们的初步工作，证明 DW 可用于提高除甲烷以外的气体（如 CO(2)和 Kr）的笼形化合物形成的动力学。我们还表明，通过加入成胶剂形成“干凝胶”，可以提高体系对聚结的稳定性，从而显著提高材料的可回收性。例如，添加结冷胶可允许在至少八个笼形化合物循环中进行有效的重复使用，而无需重新混合。DW 及其“干凝胶”改性可能代表了在静态、未混合系统中，在可行的时间尺度上实现可重复使用的气体储存或气体分离的潜在平台。
