Silicon-29 longitudinal ( T 1 ) and transverse ( T 2 ) NMR relaxation times have been measured in the clear solution precursor of silicalite-1 of composition 25 TEOS−5 TPAOH−400 H 2 O. The nanoparticles as well as the silicate oligomers are giving rise to observable resonances. An unusually long T 1 relaxation time of 126 s is observed for Q 4 in nanoparticles. Proper care for acquisition is therefore required for quantifying the distribution of Q n of the nanoparticles, an essential measurement to follow the nanoparticles connectivity evolution.
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Haouas et al. (2009) studied this question.
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