Department of Basic Sciences, Faculty of Science & Engineering, Ishinomaki Senshu University, Ishinomaki, Miyagi 986-8580, Japan.
J Colloid Interface Sci. 2011 Oct 15;362(2):463-9. doi: 10.1016/j.jcis.2011.06.047. Epub 2011 Jun 26.
The adsorption of ten gases on the flexible metal organic framework material [Cu(dhbc)(2)(4,4'-bpy)]·H(2)O (Cu(db)) has been measured over a wide range of temperatures and pressures. The gate opening condition and driving force behind gate adsorption for Cu(db) were discussed by examining the adsorption isotherms. The adsorption isotherms for each adsorbate can be generalized to a characteristic curve using the adsorption potential energy (ε) and the adsorption volume. The adsorption potential (ε(gate)) at gate opening is almost constant over a wide range of temperatures; thus, the gate pressure at a desired temperature can be deduced using the ε(gate) evaluated from one adsorption isotherm. The gate opening capacity of the gases was arranged in the order: CO(2)≒N(2)O>C(2)H(4)≒Xe>CH(4)>CO>O(2)>Ar≒N(2)>H(2), which is governed by the interaction energy between the outer surface of Cu(db) and the adsorbate. It is suggested that the gate effect is brought about when the integral interaction energy of adsorbates with the Cu(db) surface exceeds a defined limit correlating with the π-π stacking energy of Cu(db) layers.
已在较宽的温度和压力范围内测量了十种气体在柔性金属有机骨架材料[Cu(dhbc)(2)(4,4'-bpy)]·H(2)O (Cu(db))上的吸附。通过考察吸附等温线，讨论了 Cu(db)的门控吸附的开门条件和驱动力。使用吸附势能 (ε) 和吸附体积，每个吸附质的吸附等温线都可以概括为一条特征曲线。在较宽的温度范围内，开门时的吸附势 (ε(gate))几乎保持恒定；因此，可以使用从一个吸附等温线评估的 ε(gate) 来推断所需温度下的门压。气体的开门容量按以下顺序排列：CO(2)≒N(2)O>C(2)H(4)≒Xe>CH(4)>CO>O(2)>Ar≒N(2)>H(2)，这由 Cu(db)外表面与吸附质之间的相互作用能决定。当吸附质与 Cu(db)表面的积分相互作用能超过与 Cu(db)层的 π-π 堆积能相关的定义限值时，就会产生门效应。
