Column packings for high-performance liquid chromatography and positron annihilation lifetime spectroscopy |
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| Institution: | 1. Institute of Physics of SAS, 84511 Bratislava, Slovakia;2. Polymer Institute of SAS, 84236 Bratislava, Slovakia;1. Department of Materials Science and Engineering, UC Berkeley, Berkeley, CA, USA;2. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;3. School of Applied Physics, Cornell University, Ithaca, NY, USA;4. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;1. Chair of Separation Science and Technology, Friedrich-Alexander University Erlangen-Nuremberg, Egerlandstr. 3, 91058 Erlangen, Germany;2. Engineering Research Center - Phase Equilibria and Separation Processes (IVC-SEP), Department of Chemical Engineering, Building 229, Technical University of Denmark, 2800 Lyngby, Denmark;1. Delft University of Technology, Faculty of Applied Sciences, Department ChemE, Delft, The Netherlands;2. Delft University of Technology, Faculty of Applied Sciences, Department R3, Delft, The Netherlands;3. Energy Research Center of the Netherlands, Hydrogen and Clean Fossil Fuels, Petten, The Netherlands;1. R&D Center for Membrane Technology, Chung Yuan Christian University, Chung-Li 32023, Taiwan;2. Department of Chemical Engineering, Chung Yuan Christian University, Chung-Li 32023, Taiwan;3. Department of Chemistry, University of Missouri–Kansas City, Kansas City, MO 64110, USA;4. Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-Li 32003, Taiwan;5. Department of Physics, Chung Yuan Christian University, Chung-Li 32023, Taiwan;6. Department of Chemical Engineering, Nanya Institute of Technology, Chung-Li 32023, Taiwan |
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| Abstract: | Positron annihilation measurements as a function of temperature and the length of bonded alkyl groups have been carried out on silica gel samples. Silica gel samples were bare and bonded with alkyl group from C1 up to C18. The diameters of pores were deduced from the lifetime of trapped ortho-positronium (o-Ps), and it was found that o-Ps lifetime provides reasonable information on the pore sizes for both bare and alkyl bonded silica gels. |
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