Erratum

Erratum to ‘Theory for nanoparticle retention time in the helical channel of quadrupole magnetic field-flow fractionation’ [ J. Magn. Magn. Mater. 321 (2009) 1446–1451]

P. Stephen Williams^*, Francesca Carpino, Maciej Zborowski

Department of Biomedical Engineering, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, USA

Equation (22) should read

$$B_1=\frac{4ln{\rho }_i}{(1-{{\rho }_i}^2)}-\frac{(1-{{\rho }_i}^2)}{{{\rho }_i}^{2}ln{\rho }_i};B_2=\frac{(1-{{\rho }_i}^2)}{{{\rho }_i}^{2}ln{\rho }_i}$$

^* Corresponding author. Tel: +1-216-444-1217; fax: +1-216-444-9198. willias3@ccf.org