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Nonclassical Crystallization of Dipicolinic Acid in Microemulsions

Chen, C.; Nicholson, C.E.; Ramsey, H.E.; Cooper, S.J.

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Authors

C. Chen

C.E. Nicholson

H.E. Ramsey



Abstract

Dipicolinic acid (DPA) was crystallized in microemulsions to investigate the effect of three-dimensional nanoconfinement on the crystallization process. The microemulsions were acidified with 2 M HCl to prevent the formation of DPA metal salts, which occurs because of a pH shift toward neutrality arising from the nanoconfinement. Transmission electron microscopy (TEM) analysis showed that 30–100 nm square-plate nanoaggregates crystallized from these acidified microemulsions. Higher-resolution TEM images revealed that the nanoaggregates consisted of smaller 3–10 nm nanocrystals. The fast-Fourier transforms of images obtained from these nanocrystals were similar to the diffraction pattern arising from the whole nanoaggregate, confirming that the nanocrystals exhibited ordered packing and resembled mesocrystals. The crystallization of the nanoaggregates is aided by the suppression of Ostwald ripening of the nanocrystals in the nanometer-sized microemulsion droplets and adsorption of the surfactant onto the nanocrystals.

Citation

Chen, C., Nicholson, C., Ramsey, H., & Cooper, S. (2015). Nonclassical Crystallization of Dipicolinic Acid in Microemulsions. Crystal Growth and Design, 15(3), 1060-1066. https://doi.org/10.1021/cg501147j

Journal Article Type Article
Acceptance Date Dec 21, 2014
Online Publication Date Jan 19, 2015
Publication Date Mar 4, 2015
Deposit Date May 5, 2015
Publicly Available Date Mar 29, 2024
Journal Crystal Growth and Design
Print ISSN 1528-7483
Electronic ISSN 1528-7505
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 15
Issue 3
Pages 1060-1066
DOI https://doi.org/10.1021/cg501147j

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Crystal Growth and Design, copyright © 2015 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/cg501147j.





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