A systematic molecular simulation study was performed to investigate the effect of catenation on methane adsorption in metal-organic frameworks(MOFs).Four pairs of isoreticular MOFs(IRMOFs)with and without catenation ...A systematic molecular simulation study was performed to investigate the effect of catenation on methane adsorption in metal-organic frameworks(MOFs).Four pairs of isoreticular MOFs(IRMOFs)with and without catenation were adopted and their capacities for methane adsorption were compared at room temperature.The present work showed that catenation could greatly enhance the storage capacity of methane in MOFs,due to the formation of additional small pores and adsorption sites formed by the catenation of frameworks.In addition,the simulation results obtained at 298K and 3.5MPa showed that catenated MOFs could easily meet the requirement for methane storage in porous materials.展开更多
This study aimed at the geographical variation in methods of processing shea butter that has been passed on from generation to generation and storage procedures （materials and containers used/perceived shelf life of ...This study aimed at the geographical variation in methods of processing shea butter that has been passed on from generation to generation and storage procedures （materials and containers used/perceived shelf life of the products used for preservation and local perceptions about rancidity）. Little variation was found in indigenous processing methods, utilization and storage across most of the three regions. Only among the Dagomba tribe in the Northern region did women intentionally use shrubs to add yellow colour to butter particularly that for the market. The use of onions and lemon/lime leaves to prevent rancidity and also improve the taste and smell of butter was found to be practiced by only one missionary group. Perception about shelf life of the butter was found to vary widely among the processors and consumers （3 months to 2 years）. Though this was the main focus of the study, most of the indigenous processors and consumers apart from the missionary group had little experience as far as this problem was concerned. This was due to the fact that most of them consumed the butter within one or two months after processing and so the product is not kept long enough to give any appreciable signs of rancidity.展开更多
Recently,crystalline porous materials such as metal-organic frameworks（MOFs）and covalent organic frameworks（COFs）have attracted much interest not only in chemistry but also in materials science due to their tunabl...Recently,crystalline porous materials such as metal-organic frameworks（MOFs）and covalent organic frameworks（COFs）have attracted much interest not only in chemistry but also in materials science due to their tunable structures and functional channels.They have some inherent disadvantages of being difficult to solution process and recovery,which might limit their wide usage.展开更多
基金Supported by the National Natural Science Foundation of China （20706002, 20725622, 20876006） and Beijing Nova Program （2008B15）.
文摘A systematic molecular simulation study was performed to investigate the effect of catenation on methane adsorption in metal-organic frameworks(MOFs).Four pairs of isoreticular MOFs(IRMOFs)with and without catenation were adopted and their capacities for methane adsorption were compared at room temperature.The present work showed that catenation could greatly enhance the storage capacity of methane in MOFs,due to the formation of additional small pores and adsorption sites formed by the catenation of frameworks.In addition,the simulation results obtained at 298K and 3.5MPa showed that catenated MOFs could easily meet the requirement for methane storage in porous materials.
文摘This study aimed at the geographical variation in methods of processing shea butter that has been passed on from generation to generation and storage procedures （materials and containers used/perceived shelf life of the products used for preservation and local perceptions about rancidity）. Little variation was found in indigenous processing methods, utilization and storage across most of the three regions. Only among the Dagomba tribe in the Northern region did women intentionally use shrubs to add yellow colour to butter particularly that for the market. The use of onions and lemon/lime leaves to prevent rancidity and also improve the taste and smell of butter was found to be practiced by only one missionary group. Perception about shelf life of the butter was found to vary widely among the processors and consumers （3 months to 2 years）. Though this was the main focus of the study, most of the indigenous processors and consumers apart from the missionary group had little experience as far as this problem was concerned. This was due to the fact that most of them consumed the butter within one or two months after processing and so the product is not kept long enough to give any appreciable signs of rancidity.
文摘Recently,crystalline porous materials such as metal-organic frameworks（MOFs）and covalent organic frameworks（COFs）have attracted much interest not only in chemistry but also in materials science due to their tunable structures and functional channels.They have some inherent disadvantages of being difficult to solution process and recovery,which might limit their wide usage.
