Dipolar correlation length

However, there is no reason for the dipolar correlation length to acquire its maximum value in all the systems. We estimated that the tilting of the clusters with small angles (below 20°)... 

The last equation indicates that dipolar correlations length smaller than Xm=l5 A are expected to occur in disordered systems. 

An important issue is whether or not this increase in the decay length occurs for any colloidal system. The derivation of the value tor A ,=14.9 A assumed an ice-like order for the clusters around each water molecule [30], When this order is lowered, the value of the dipole correlation length is expected to decrease. A phenomenological model for the decrease of A, with the decrease of the average dipolar moment of water molecules is proposed in Section 2.3. In... 

Pig. 20. Two-dimensional H DQ MAS spectrum for thermoplastic elastomers PBT-hlock-PTMO with a length of PTMO block of 1000 g/mol and amount of PTMO block of 35% in weight (sample AlOOO/35) showing the dipolar correlation between the resonances of PBT and PTMO chain units, as indicated by the lines connecting the peak positions. Reproduced from Ref 123, with permission from American Chemical Society. 

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