[RASMB] frictional coefficient of rings?

[Olwyn Byron]

Dear Karl,

In the paper to which you refer, the authors used 
bead modelling extrapolated to the case of a 
shell.  Stuart Allison has updated this work for 
the case of a toroid, using boundary element 
modelling (Allison, Macromolecules (1999) vol 32 
pp 5304-12).  Although the software used by Dr 
Allison for the computation of f is not freely 
available, I am sure he would be happy to assist 
(sallison at gsu.edu).

Alternatively you could construct a bead-shell 
model for the toroid using the program MAKEPIXB, 
written by José García de la Torre's group, and 
then compute its frictional coefficient using 
their program HYDROPIX 
(http://leonardo.fcu.um.es/macromol/programs/hydropix/hydropix.htm).

My impression is that either approach will yield a satisfactory value for f.

Good luck and best wishes-
Olwyn Byron

>Hello,
>
>Is there a more recent treatment of the 
>frictional coefficient of toroids than the 
>Allison, Easterly and Teller Biopolymers paper 
>(vol 19, 1475-1489) 1980?
>
>Thanks,
>
>Karl
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