The name is absent



Alexander [51] and de Gennes [52], where < z > can be defined as

z >=


ʃ zp{z)dz
fρ(z)dz ’


(6.29)


< z > is calculated for a number of polymer brushes at various Ng and pg. Figure 6.2b
shows that modified iSAFT follows the scaling relation for < z >. The maximum
distance to which the brushes extend away from the wall is defined as the brush height
h. Figure 6.2b also shows that h follows the same scaling relation. Numerically, h is
calculated as the normal distance from the wall after which the total segment density
of the tethered chains, pσ3 < 10~6.

Figure 6.3: (a) Segment density profiles of attractive chains tethered to a hard wall for
Ng = 200 and pgσ2 = 0.1 at e∕kT = 0 (∙), T* = 4 (à), T* = 3 (■) and T* = 2 (▼). Symbols
are the simulation results from Grest and Murat [230] and curves are the predictions from
modified iSAFT. (b) Average brush height, < z > vs Ngρ1f∕3 for attractive chains tethered
to a hard wall at T* = 4 (good solvent), for Ng = 50, 100 and 200 at different grafting
densities. Symbols are the prediction from modified iSAFT and the dashed curve is linear
fit to this data.


159




More intriguing information

1. The bank lending channel of monetary policy: identification and estimation using Portuguese micro bank data
2. Citizenship
3. Death as a Fateful Moment? The Reflexive Individual and Scottish Funeral Practices
4. The name is absent
5. Group cooperation, inclusion and disaffected pupils: some responses to informal learning in the music classroom
6. The name is absent
7. The name is absent
8. The name is absent
9. The name is absent
10. The name is absent