Addition/Correction pubs.acs.org/JPCB
Correction to “Tributyl Phosphate Aggregation in the Presence of Metals: An Assessment Using Diffusion NMR Spectroscopy” Anna G. Baldwin, Yuan Yang, Nicholas J. Bridges, and Jenifer C. Braley* J. Phys. Chem. B 2016, 120 (47), 12184−12192. DOI: 10.1021/acs.jpcb.6b09154 Due to a data transcription error, the diffusion coefficient of tributyl phosphate in the heavy organic phase was misreported as 3.45 × 10−10 m2/s rather than 3.45 × 10−11 m2/s. This error affects the paper as follows (corrections are in bold type): The last sentence of the Abstract should read as follows: “The diffusion of TBP in heavy organic third phases indicates that the third phase may be a bicontinuous structure like that found in traditional surfactant systems.” On p 12189, the last paragraph of the section “NMR Aggregate Sizes: Comparison between Samples” should read as follows: “The average diffusion coefficient of TBP-containing species in the third phase sample was found to be (3.45 ± 0.07) × 10−11 m2/s. This value is an order of magnitude smaller than the average TBP diffusion coefficient of an n-dodecane solution containing only 20% v/v TBP (i.e., not preequilibrated with an acid solution), which was found to be (4.75 ± 0.10) × 10−10 m2 /s. The effects of interparticle interactions on these values are small compared to the effects that would be expected by the participation of TBP in a liquid crystalline-like phase. In a bicontinuous structure, like the interconnected-cylinder structure proposed by Ellis et al.,21 for the third phase formed in a different mixed extractant system containing various acids and TBP, it would be expected that the diffusion coefficient of TBP would be an order of magnitude slower than the diffusion coefficient of free TBP, that is, on the order of 10−11 m2 /s.47 This is the case in an extraction system containing acid, TBP, and zirconium. The order of magnitude decrease in the rate of TBP diffusion observed in the third phase sample suggests that an analogy between third phase formation and the formation of liquid crystalline phases in surfactant systems may be applicable. This observation should be verified by measuring and comparing the n-dodecane and TBP diffusion coefficients in third phase samples using a technique like diffusion-ordered spectroscopy, which is used to separate the diffusion coefficients of the components of a mixture.49” The last sentence of the Summary and Conclusions should read as follows: “Finally, the diffusion coefficient of TBP in a third phase sample was found to be an order of magnitude slower than that of TBP in solution, showing that it is possible that the third phase results from the formation of a liquid crystalline phase.”
Published: March 8, 2017 © 2017 American Chemical Society
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DOI: 10.1021/acs.jpcb.7b01762 J. Phys. Chem. B 2017, 121, 2371−2371
