표제지
ABSTRACT
목차
1. Introduction 8
1.1. Hydrogen isotope separation 9
1.2. Hydrogen Isotope Separation by Metal-Organic Frameworks (MOF) 11
1.3. MIL-53(Al) (MIL : Materials Institute of Lavoisier) 13
1.4. Neutron scattering 16
1.4.1. QENS techniques 20
2. Experimental 24
2.1. Synthesis of MOF 24
2.1.1. MIL-53(Al) 24
2.2. Measurement 24
2.2.1. Physical and textural characterization 24
2.2.2. Quasi-elastic scattering (QENS) measurement 30
3. Results and discussion 31
3.1. Results of neutron scattering 31
4. Conclusion 40
5. Reference 41
6. Appendix 45
1. QENS data of Empty can at various temperature (25K, 40K, 60K and 77K) with incident neutron wavelength of 2 Å, 6 Å and 8 Å. 45
2. QENS data of MIL-53(Al) without gas at various temperature (25K, 40K, 60K and 77K) with incident neutron wavelength of 2 Å, 6 Å and 8 Å. 50
3. QENS data of D2 in MIL-53(Al) at various temperature (25K, 40K, 60K and 77K) and gas loading pressure (0.7, 6.4, 18, 21, 26 mmol/g) with incident neutron wavelength of 6 Å 56
4. QENS data of H2 in MIL-53(Al) at various temperature (25K, 40K, 60K and 77K) and gas loading pressure (0.7, 6.4, 18 mmol/g) with incident neutron wavelength of 6 Å 70
Table 3.1. Width of Lorentzian and mu (profile shape factor) of H₂ and D₂ in MIL-53(Al)(이미지참조) 34
Table 3.2. Parameter (characteristic lengths, residency times, diffusivity) of fitting for HWHM. 37
Figure 1.1. Schematic of Girdler sulfide process 9
Figure 1.2. Schematic of liquid hydrogen distillation 10
Figure 1.3. Structure of MIL-53(Al) with (a) narrow pre (np) and (b) large pore (lp). 14
Figure 1.4. Adsorption(closed symbol)-desorption(open symbol) isotherms of (a) hydrogen and... 15
Figure 1.5. (a) Neutron powder diffraction of D2 in MIL-53(Al). (b) Isotherm of D2 in MIL-53(Al)... 16
Figure 1.6. Schematic of the relative total scattering cross sections for neutrons and X-rays for... 18
Figure 1.7. The principle of neutron scattering 18
Figure 1.8. Schematic illustration of a neutron scattering spectrum, containing elastic, inelastic,... 20
Figure 1.9. Schematic of Backscattering scattering Spectrometer37 Copyright 2019 Physics today 21
Figure 1.10. Schematic of Neutron spin-echo scattering copyright 2006 Science 22
Figure 1.11. Schematic of Time of Flight copyright Elsevier 2013 23
Figure 2.1. X-ray diffraction pattern of MIL-53(Al) 25
Figure 2.2. SEM image of MIL-53(Al) at (a) 2,000 and (b) 2,500 of Magnification. 26
Figure 2.3. TGA curve of MIL-53(Al) 27
Figure 2.4. FT-IR spectra of MIL-53(Al) 28
Figure 2.5. (a) N2 isotherm at 77K of MIL-53(Al) and (b) pore size distribution (PSD) of MIL-... 29
Figure 2.6. Digital photos of (a) X-ray diffractometer, (b) scanning electron microscopy, (c)... 30
Figure 3.1. QENS data for hydrogen at (a) 25K, (b) 40K, (c) 60K, (d) 77K for energy transfer of... 32
Figure 3.2. QENS data for deuterium at (a) 25K, (b) 40K, (c) 60K, (d) 77K for energy transfer of... 33
Figure 3.3. QENS data of 1.125Å comparison between H₂ and D₂ various loading pressure of gas... 34
Figure 3.4. QENS data for 1.125Å of D2 and H2 at 18 mmol/g and 77 K in MIL-53(Al). The... 35
Figure 3.5. Half-width at half-maximum of the Lorentzian for fits to the QENS data of H₂ 36
Figure 3.6. Half-width at half-maximum of the Lorentzian for fits to the QENS data of D₂. 37
Figure 3.7. Diffusivity factor of H2 and D2 for various loading of gas at (a) 25K, (b) 40K, (c)... 39
Figure 3.8. Diffusivity factor of H2 and D2 for different temperature at loading pressure of (a)... 39