Nanoporous Solids: How Do They Form? An In Situ Approach

2013 ◽  
Vol 26 (1) ◽  
pp. 299-309 ◽  
Author(s):  
Gérard Férey ◽  
Mohamed Haouas ◽  
Thierry Loiseau ◽  
Francis Taulelle
Keyword(s):  
Nanoporous Solids

ChemInform Abstract: Nanoporous Solids: How Do They Form? An in situ Approach

ChemInform ◽  
2014 ◽  
Vol 45 (10) ◽  
pp. no-no
Author(s):  
Gerard Ferey ◽  
Mohamed Haouas ◽  
Thierry Loiseau ◽  
Francis Taulelle
Keyword(s):  
Nanoporous Solids

scholarly journals In situ studies of gas sorption in porous networks

2014 ◽  
Vol 70 (a1) ◽  
pp. C1468-C1468
Author(s):  
Anna Plonka ◽  
Debasis Banerjee ◽  
William Woerner ◽  
John Parise
Keyword(s):  
Relative Humidity ◽  
Porous Materials ◽  
Structural Changes ◽  
Interatomic Potentials ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Enthalpy Of Interaction ◽  
Nanoporous Solids ◽  
Gas Interactions

Selective gas separation is one of the key properties exploited in industrial processes utilizing porous materials. The crystal structure of the native and activated frameworks, along with those of ion exchanged and otherwise modified variants, provide the basis for rational development of gas-selective nanoporous solids. In situ scattering studies of gas-loaded materials provide an understanding of the nature of interactions between sorbed gas and pore surface, which can be vital to development of reliable interatomic potentials, used simulating adsorption behavior. We find that simultaneous observation of the Differential Scanning Calorimetry coupled with x-ray diffraction (DSC-XRD) measurements is a particularly powerful tool 1, 2. The powder diffraction pattern can be monitored for changes, such as framework collapse, as porous materials are heated and activated. Apart from monitoring structural changes, thermal responses accompanying dynamic exposure to gases at variable humidity, and as the temperature is varied, provides a reliable tool in order to screen for new and potentially selective porous materials. The DSC signal provides a reliable means to determine the enthalpy of interaction between framework and gas, and there is experimental evidence this signal may distinguish between gas interactions with bare metal sites in the activated framework and other gas-framework interactions. Studies where the enthalpy of interaction and X-ray scattering from low angle peaks, which are most sensitive to the filling and evacuation of pores of the porous materials are monitored, can be coupled with varying the nature of the gas and the relative humidity. These studies are conveniently carried out with a modified gas manifold interfaced to a slightly modified Rigaku corporation DSC-XRD, which allows studies from about 150 – 600 K. Illustrative examples of the use of this laboratory based equipment, which provide the underpinnings of detailed single crystal studies of gas-loaded materials, include studies of porous calcium based coordination network (CaSDB, SDB: 4,4' - sulfonyldibenzoate), which is selective for CO2, even in the presence of high relative humidity (RH). Recent results from a series of materials studied in the home laboratory and at synchrotron sources will be presented.

Probing the Evolution of Adsorption on Nanoporous Solids by In Situ Solid-State NMR Spectroscopy

ChemPhysChem ◽  
2007 ◽  
Vol 8 (9) ◽  
pp. 1311-1313 ◽  
Author(s):  
Mingcan Xu ◽  
Kenneth D. M. Harris ◽  
John Meurig Thomas ◽  
David E. W. Vaughan
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Solid State Nmr Spectroscopy ◽  
Nanoporous Solids

Flow MAS NMR for In Situ Monitoring of Carbon Dioxide Capture and Hydrogenation Using Nanoporous Solids

2021 ◽  
Author(s):  
Marianne Wenzel ◽  
Muhammad A. Zaheer ◽  
Dilara Issayeva ◽  
David Poppitz ◽  
Jörg Matysik ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Capture ◽  
Mas Nmr ◽  
In Situ Monitoring ◽  
Nanoporous Solids

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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