Stability study of MOF@IL composite materials

Abstract enviado al congresos 5th International Conference on Multifunctional, Hybrid and Nanomaterials (6-10 March 2017 | Lisbon, Portugal) y poster presentado en dicho congreso.Metal-organic frameworks (MOF) offer unique advantages for many applications due to their ordered structures, high thermal stability, tunable chemical functionality, ultra-high porosity and the availability of hundreds of well characterized structures.[1] On the other hand, Ionic Liquids (IL), which are ionic salts liquid at ambient conditions, have suitable properties for many applications, such as negligible volatility, non-flammability, high thermal and chemical stability, and high ionic conductivity. However, their liquid nature hinders their handling, making it necessary the use solid supports. [2] The insertion of ILs into MOFs has resulted in a new generation of materials with properties of both MOF and IL. [3] The studies of potential applications of MOF@IL composite materials are still very incipient, but they point out that the properties of MOFs could be improved by the insertion of ILs.[4] In order to know whether MOF@IL could be used as new materials it is necessary to study their stability, both thermal and chemical. In this work, three MOFs were selected, CuBTC, ZIF-8 and MOF-74,[5] to produce MOF@IL with two ILs, [BMIM][BF4] and [EMIM][BF4]. Themogravimetry was used to determine the thermal stability of the composites, as well as, to quantify the IL content before and after the leakeage tests both in water and toluene. Other characterization techniques, such as, IR spectroscopy and X-ray powder diffraction were used. The insertion of ILs was successful for CuBTC and ZIF-8, but not for MOF-74. The thermal stability of the MOF@IL is related to the interactions established between thet MOF and the IL. However, the chemical stability of the composites in water and toluene depend on that of the MOFs and, consequently, a poor stability is observed for CuBTC@IL in water. The use of these new materials is, therefore, determined by the stability of the MOFs acting as host structures.Ministerio de Economía y Competitividad: MAT2013-42092-R Gobierno Vasco: IT-630-13 Dpto. desarrollo economico y competitividad (GV), programa ELKARTEK: ACTIMAT KK-2015/00094 y LISOL KK-2016/0009

The Eocene-Oligocene climate transition in the Alpine foreland basin: Paleoenvironmental change recorded in submarine fans

The Eocene-Oligocene transition (EOT) was a period of considerable environmental change, signifying the transition from Paleocene greenhouse to Oligocene icehouse conditions. Preservation of the sedimentary signal of such an environmental change is most likely in net-depositional environments, such as submarine fans, which are the terminal parts of sedimentary systems. Here, using sedimentary and stable isotope data from the Alpine foreland basin, we assess whether this major climatic transition influenced the stratigraphic evolution of submarine fans. Results indicate that fine-grained deposition in deep-water environments corresponds to positive δ13C excursions and eustatic highstands, while coarse-grained deposition corresponds to negative δ13C excursions and eustatic lowstands during the earliest Oligocene. While alternative explanations cannot be ruled out on the basis of this dataset alone, our results suggest that eustatic fluctuations across the EOT and into the early Oligocene influenced sediment supply to deep-water environments

Stability study of MOF@IL composite materials

Abstract enviado al congresos 5th International Conference on Multifunctional, Hybrid and Nanomaterials (6-10 March 2017 | Lisbon, Portugal) y poster presentado en dicho congreso.Metal-organic frameworks (MOF) offer unique advantages for many applications due to their ordered structures, high thermal stability, tunable chemical functionality, ultra-high porosity and the availability of hundreds of well characterized structures.[1] On the other hand, Ionic Liquids (IL), which are ionic salts liquid at ambient conditions, have suitable properties for many applications, such as negligible volatility, non-flammability, high thermal and chemical stability, and high ionic conductivity. However, their liquid nature hinders their handling, making it necessary the use solid supports. [2] The insertion of ILs into MOFs has resulted in a new generation of materials with properties of both MOF and IL. [3] The studies of potential applications of MOF@IL composite materials are still very incipient, but they point out that the properties of MOFs could be improved by the insertion of ILs.[4] In order to know whether MOF@IL could be used as new materials it is necessary to study their stability, both thermal and chemical. In this work, three MOFs were selected, CuBTC, ZIF-8 and MOF-74,[5] to produce MOF@IL with two ILs, [BMIM][BF4] and [EMIM][BF4]. Themogravimetry was used to determine the thermal stability of the composites, as well as, to quantify the IL content before and after the leakeage tests both in water and toluene. Other characterization techniques, such as, IR spectroscopy and X-ray powder diffraction were used. The insertion of ILs was successful for CuBTC and ZIF-8, but not for MOF-74. The thermal stability of the MOF@IL is related to the interactions established between thet MOF and the IL. However, the chemical stability of the composites in water and toluene depend on that of the MOFs and, consequently, a poor stability is observed for CuBTC@IL in water. The use of these new materials is, therefore, determined by the stability of the MOFs acting as host structures.Ministerio de Economía y Competitividad: MAT2013-42092-R Gobierno Vasco: IT-630-13 Dpto. desarrollo economico y competitividad (GV), programa ELKARTEK: ACTIMAT KK-2015/00094 y LISOL KK-2016/0009