Langmuir 2003, 19, 7147-7147
7147
Additions and Corrections Bonding Organics to Ti Alloys: Facilitating Human Osteoblast Attachment and Spreading on Surgical Implant Materials Corrections E. S. Gawalt, M. J. Avaltroni, M. P. Danahy, B. M. Silverman, E. L. Hanson, K. S. Midwood, J. E. Schwarzbauer, and J. Schwartz* Langmuir 2003, 19, 200-204. . The surface coverages originally reported in Table 1 were incorrectly calculated at twice their actual values due to an error in implementing the Sauerbrey equation for double-sided quartz crystal microbalance measurements.1 The correct values are shown below. Chemical yields for conversion of 6 to 7 and of 7 to 8 are unchanged, and surface coverages measured remain slightly higher than those obtained for alkanethiols on gold. Table 1. Surface Coverage of Ti by Alkylphosphonates and Derivatives As Measured by QCM: (a) Preparation of Phosphonate Films; (b) Derivatization of 11-Hydroxyundecylphosphonate (6) (a) Preparation of Phosphonate Films preparation of phosphonate film octylphosphonate (11)
∆f (Hz) 109 115
average
coverage, nmol cm2 a
preparation of phosphonate film
1.49 (1.15) 1.58 (1.21) (1.18)
11-hydroxyundecylphosphonate (6)
∆f (Hz) 141 115 140 135 106 135
average
coverage, nmol cm2 a 1.42 (1.09) 1.15 (0.89) 1.42 (1.08) 1.36 (1.05) 1.07 (0.82) 1.36 (1.05) (1.00)
(b) Derivatization of 11-Hydroxyundecylphosphonate (6)
b
coverage by 6, nmol/cm2 b
conversion to 7, ∆f (Hz)
coverage, nmol/cm2
yield (%)
conversion to 8, ∆f (Hz)
coverage, nmol/cm2
yield (%)
1.36 (1.05) 1.07 (0.82) 1.36 (1.05) average
37 31 27
0.54 (0.42) 0.45 (0.35) 0.40 (0.31)
40 42 29 37
69 47
0.38 (0.26) 0.23 (0.18)
74 58 66
a Corrected value for surface roughness factor measured to be 1.3 by AFM analysis of the sputtered Ti electrode given in parentheses. Corrected value for surface roughness given in parentheses.
LA034843Q 10.1021/la034843q Published on Web 07/25/2003 (1) Rodahl, M.; Ho¨o¨k, F.; Krozer, A.; Brzezinski, P.; Kasemo, B. Rev. Sci. Instrum. 1995, 66, 3924.
10.1021/la034843q CCC: $25.00 © 2003 American Chemical Society Published on Web 07/25/2003
