However, in many common porous building materials usually large amounts of paramagnetic ions (e.g., Fe) are present, which complicates the NMR measurements by two effects. First, T2 will be drastically decreased by paramagnetic centers at the surface of the pores. Secondly, local field gradients will be induced, which broaden the resonance line and thereby limit the spatial resolution.
However, in many common porous building materials usually large amounts of paramagnetic ions (e.g., Fe) are present, which complicates the NMR measurements by two effects. First, T2 will be drastically decreased by paramagnetic centers at the surface of the pores. Secondly, local field gradients will be induced, which broaden the resonance line and thereby limit the spatial resolution.
正在翻译中..
However, in many common porous building materials usually large amounts of paramagnetic ions (e.g., Fe) are present, which complicates the NMR measurements by two effects. First, T2 will be drastically decreased by paramagnetic centers at the surface of the pores. Secondly, local field gradients will be induced, which broaden the resonance line and thereby limit the spatial resolution.
正在翻译中..