Preparation Of Membranes And Assembly Of Metal-Organic Frameworks

Metal-organic frameworks (MOFs) as a new class of porous materials have attracted tremendous attention due to their intriguing molecular topologies and wide potential applications in ion-exchange, gas storage, optics and catalysis. Metal-organic frameworks with rigid open frameworks not only possess porous crystaline structures similar to those of inorganic microporous materials, zeolites, but also exhibit favorable adsorption of many gas and organic liquid molecules. Along with the design and preparation of MOFs of larger channels and cavities, much attention has turned to explore functionality of metal-organic frameworks with the promising applications.Laser dye molecules which must be provided in monodispersed state tend to polymerize in solution even though in a very low concentration so that it can't behaves the strong optic activity. One of the main research areas of the organic functional dyes focuses on adjusting their photosensitivity by assembly or chemical modification to obtain fluorescence blue-shift composite materials, which can take an important action in optical sensors. Dye molecule has been dispersed into the channels of porous materials, which can efficaciously avoid congregation of dye molecules. We manipulate MOFs materials utilizing their regulated and tunable nanochannels for functionality exploitation. MOFs are about to be used as a perfect host for assembling of organic dyes due to their uniform pores and large surface area. The encapsulation of organic dyes molecules into MOFs breaks through the confine of inorganic microporous and mesoporous materials as hosts, as well as affords favorable bases for the study of their potential application as multifunctional materials in optical microdevices and microsensors.MOF-5 extended network have a three-dimensional intersecting channel system with 12.94 ? spacing and have the sorption behaviors for nitrogen, argon, organic vapors. Langmuir surface area of MOF-5 is estimated at 2,900 m2g-1. 55 ~ 61% of the framework space is accessible to guest species. The guests can be fully exchanged with chloroform. Laser dye Coumarin 151 and Rhodamine B have been successfully encapsulated within the MOF-5 crystals in CHCl3 solvent. The both composite showed strong fluorescence.Zeolites are crystalline structures that have uniform, molecular-sized pores. Continuous polycrystalline zeolites layers have been deposited on porous supports and used as zeolites membranes which are of intense interest for their fantastic applications in catalysis, sensors and separation techniques. Currently, metal-organic frameworks membranes are anticipated to have a similar potential. To grow high quality membranes, a copper net which is coated by the carboxylate-terminated SAMs, is preferential when considering its elasticity, tenacity, relatively low cost and ease of manufacturing.Herein, we report the first preparation and characterization of continuous high quality copper-net-supported MOF-5 membranes. MOF-5 has regular and continuous three-dimensional nanochannels system. The laser dye Coumarin 151 which suits the MOF-5 cavities in size has been successfully encapsulated within the membranes using CHCl3 solvent. The luminescent properties have been investigated. The preparation of dye-loaded metal-organic framework membranes affords favorable bases for the study of their potential application in optical system.