Intermolecular double-quantum NMR techniques to probe microstructures on porous media.
In heterogeneous systems the amplitude of the intermolecular double-quantum (DQ) signal depends on sample heterogeneity over a correlation distance dc=pi/(gammaGct). In this paper two different CRAZED-type sequences were applied in a porous medium phantom. One of these sequences gives rise to a DQ-T2 weighted signal, while the other one gives rise to a DQ-T2* weighted signal. Experimental results indicate that tuning of the correlation distance dc in a porous medium can alter the DQ signal in a manner which depends on the microstructure. This is evident only using the CRAZED-type sequence which gives rise to a DQ-T2* weighted signal.
Capuani
S
S
Physics Department 'La Sapienza' University, and INFM UdR Roma1, P.le A. Moro 5, 00185 Rome, Italy.
Branca
R T
RT
Alesiani
M
M
Maraviglia
B
B
D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D019047:Phantoms, Imaging; D016062:Porosity