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. 2015 Sep 22;6:8309. doi: 10.1038/ncomms9309

Table 1. Samples characteristics and longitudinal sound velocities in the assemblies.

Sample σ (nm−2) N d (nm) cPS (m s−1) ceff-th (m s−1) ceff-exp (m s−1)
DP100 0.61 130 142 2,820 2,688 2,710
DP400 0.61 400 176 2,562 2,482 2,480
DP600 0.56 630 201 2,526 2,469 2,420
DP1000 0.48 980 214 2,350 2,309 2,360

σ, grafting density; N, degree of polymerization; d, distance core to core; cPS, polystyrene sound velocity; ceff,th, computed effective sound velocity; ceff,exp, measured effective sound velocity.