Project objectives and activities
The main scientific objective of the proposed project is to contribute to the understanding of the way in which solid-liquid interface interactions determine the translation and rotation of molecules confined inside partially saturated porous media. Because porous structures are heterogeneous by nature and may contain magnetic impurities a secondary objective is to evaluate the effects of the internal fields, generated by susceptibility differences, on NMR diffusion and relaxation measurements. In order to fulfill these objectives will be performed systematic diffusion and nuclear relaxation measurements to acquire information on the restriction imposed by the surface on molecular mobility (translational and rotational). The research activities will include: sample preparation and characterization, NMR diffusion and relaxation measurements, random walk computer simulations and testing of theoretical models regarding fluid distribution and transport to describe the observed phenomena.
The specific objectives and the main activities associated are:
Year 2011 (Budget: 88000 lei)
O1. Preparation and characterisation of porous samples with controlled amount of magnetic
impurities
A1. Preparation of porous samples with different amounts of magnetic impurities;
A2. Characterisation of the produced samples with respect to their magnetic susceptibility;
A3. Characterisation of the produced samples with respect to porosity and pore size distribution.
Year 2012 (Budget: 799500 lei)
O2. The influence of the internal gradients on diffusion and relaxation measurements
A1. Extracting of the internal gradients of the produced samples;
A2. Evaluating the influence of internal gradients on diffusion measurements;
A3. Evaluating the influence of internal gradients on relaxation measurements;
A4. Evaluating the influence of internal gradients on the thickness of the surface layer used in
the interpretation of relaxation data;
A5. Testing the efficiency and the limits of compensating gradient techniques for diffusion
measurements;
A6. Acquisition and testing of a Fast Field Cycling NMR instrument
Year 2013 (Budget: 140583 lei)
O3. Study of the molecule-surface interaction effects on macroscopic dynamics (translational
diffusion) and location of polar and non-polar molecules under confinement
A1. Study the molecule-surface interaction effects on translational dynamics of molecules
confined inside porous media without magnetic impurities;
A2. Study the molecule-surface interaction effects on translational dynamics of molecules
confined inside porous media with controlled amount of magnetic impurities;
A3. Applications of the previous studies to the cement based materials;
Year 2014 (Budget: 150563 lei)
O4. Study of the molecule-surface interaction effects on rotational dynamics of molecules confined inside porous media without magnetic impurities
A1. Measurement of the relaxation rate of polar and nonpolar molecules confined inside porous VitraPor as a function of temperature and frequency and elaboration of a theoretical model describing the results;
A2. Investigating the possibility of using the dipolar correlations effects on stimulating echo attenuation
as a tool in extracting the correlation times at the interface of porous media;
A3. Determining the relative role of intra and inter-molecular interactions in the relaxation process by
using deuterated molecules.
Year 2015 (Budget: 103686 lei)
O5. Study of the molecule-surface interaction effects on rotational dynamics of molecules confined inside porous ceramics with magnetic impurities
A1. Measurement of the relaxation rate of polar and nonpolar molecules confined inside porous ceramics as a function of temperature and frequency;
A2. Investigation of the relaxation dynamics in the vicinity of phase transition and the identification of
the liquid and solid component;
Year 2016 (Budget: 217668 lei)
O6. Application of the previous knowledge to the investigation of rotational dynamics of water molecules confined inside cement paste
A1. Measurement of the relaxation rate in cement paste as a function of temperature and frequency of the external magnetic field at different hydration times;
A2. Comparison of the results obtained on cement paste with those on porous ceramics with similar amount of magnetic impurities and pore dimensions.
The main scientific objective of the proposed project is to contribute to the understanding of the way in which solid-liquid interface interactions determine the translation and rotation of molecules confined inside partially saturated porous media. Because porous structures are heterogeneous by nature and may contain magnetic impurities a secondary objective is to evaluate the effects of the internal fields, generated by susceptibility differences, on NMR diffusion and relaxation measurements. In order to fulfill these objectives will be performed systematic diffusion and nuclear relaxation measurements to acquire information on the restriction imposed by the surface on molecular mobility (translational and rotational). The research activities will include: sample preparation and characterization, NMR diffusion and relaxation measurements, random walk computer simulations and testing of theoretical models regarding fluid distribution and transport to describe the observed phenomena.
The specific objectives and the main activities associated are:
Year 2011 (Budget: 88000 lei)
O1. Preparation and characterisation of porous samples with controlled amount of magnetic
impurities
A1. Preparation of porous samples with different amounts of magnetic impurities;
A2. Characterisation of the produced samples with respect to their magnetic susceptibility;
A3. Characterisation of the produced samples with respect to porosity and pore size distribution.
Year 2012 (Budget: 799500 lei)
O2. The influence of the internal gradients on diffusion and relaxation measurements
A1. Extracting of the internal gradients of the produced samples;
A2. Evaluating the influence of internal gradients on diffusion measurements;
A3. Evaluating the influence of internal gradients on relaxation measurements;
A4. Evaluating the influence of internal gradients on the thickness of the surface layer used in
the interpretation of relaxation data;
A5. Testing the efficiency and the limits of compensating gradient techniques for diffusion
measurements;
A6. Acquisition and testing of a Fast Field Cycling NMR instrument
Year 2013 (Budget: 140583 lei)
O3. Study of the molecule-surface interaction effects on macroscopic dynamics (translational
diffusion) and location of polar and non-polar molecules under confinement
A1. Study the molecule-surface interaction effects on translational dynamics of molecules
confined inside porous media without magnetic impurities;
A2. Study the molecule-surface interaction effects on translational dynamics of molecules
confined inside porous media with controlled amount of magnetic impurities;
A3. Applications of the previous studies to the cement based materials;
Year 2014 (Budget: 150563 lei)
O4. Study of the molecule-surface interaction effects on rotational dynamics of molecules confined inside porous media without magnetic impurities
A1. Measurement of the relaxation rate of polar and nonpolar molecules confined inside porous VitraPor as a function of temperature and frequency and elaboration of a theoretical model describing the results;
A2. Investigating the possibility of using the dipolar correlations effects on stimulating echo attenuation
as a tool in extracting the correlation times at the interface of porous media;
A3. Determining the relative role of intra and inter-molecular interactions in the relaxation process by
using deuterated molecules.
Year 2015 (Budget: 103686 lei)
O5. Study of the molecule-surface interaction effects on rotational dynamics of molecules confined inside porous ceramics with magnetic impurities
A1. Measurement of the relaxation rate of polar and nonpolar molecules confined inside porous ceramics as a function of temperature and frequency;
A2. Investigation of the relaxation dynamics in the vicinity of phase transition and the identification of
the liquid and solid component;
Year 2016 (Budget: 217668 lei)
O6. Application of the previous knowledge to the investigation of rotational dynamics of water molecules confined inside cement paste
A1. Measurement of the relaxation rate in cement paste as a function of temperature and frequency of the external magnetic field at different hydration times;
A2. Comparison of the results obtained on cement paste with those on porous ceramics with similar amount of magnetic impurities and pore dimensions.