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Morphosynthesis of Alanine Mesocrystals by pH Control

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2006

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Ma, Yurong
Cölfen, Helmut
Antonietti, Markus

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https://doi.org/10.1021/jp0574807
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The Journal of Physical Chemistry B. 2006, 110(22), pp. 10822-10828. ISSN 1520-6106. eISSN 1520-5207. Available under: doi: 10.1021/jp0574807

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Crystallization of DL-alanine is studied as a single polymorph model case to analyze the different modes of crystallization of polar organic molecules in absence of any structure directing additives. Depending on supersaturation, which is controlled either by temperature or by pH, and in the absence of additives, crystallization by mesoscale assembly of nanoparticles is found over a wide range of conditions, leading to so-called mesocrystals. This supplements the classical molecule-based crystallization mechanism, which is identified at lower supersaturations and at pH values away from the isoelectric point (IEP). The resulting alanine crystals are characterized by SEM, XRD, and single-crystal analysis. Time-resolved conductivity measurements and dynamic light scattering of the reaction solutions reveal information about precursor structures and reaction kinetics. A formation mechanism is proposed for the alanine mesocrystals.

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ISO 690MA, Yurong, Helmut CÖLFEN, Markus ANTONIETTI, 2006. Morphosynthesis of Alanine Mesocrystals by pH Control. In: The Journal of Physical Chemistry B. 2006, 110(22), pp. 10822-10828. ISSN 1520-6106. eISSN 1520-5207. Available under: doi: 10.1021/jp0574807
BibTex
@article{Ma2006-06Morph-40257,
  year={2006},
  doi={10.1021/jp0574807},
  title={Morphosynthesis of Alanine Mesocrystals by pH Control},
  number={22},
  volume={110},
  issn={1520-6106},
  journal={The Journal of Physical Chemistry B},
  pages={10822--10828},
  author={Ma, Yurong and Cölfen, Helmut and Antonietti, Markus}
}
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