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Cholakova D, Glushkova D, Valkova Z, et al. Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques. J Colloid Interface Sci. 2021;604:260-271doi: 10.1016/j.jcis.2021.06.122.
Cholakova, D., Glushkova, D., Valkova, Z., Tsibranska-Gyoreva, S., Tsvetkova, K., Tcholakova, S., & Denkov, N. (2021). Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques. Journal of colloid and interface science, 604260-271. https://doi.org/10.1016/j.jcis.2021.06.122
Cholakova, Diana, et al. "Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques." Journal of colloid and interface science vol. 604 (2021): 260-271. doi: https://doi.org/10.1016/j.jcis.2021.06.122
Cholakova D, Glushkova D, Valkova Z, Tsibranska-Gyoreva S, Tsvetkova K, Tcholakova S, Denkov N. Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques. J Colloid Interface Sci. 2021 Dec 15;604:260-271. doi: 10.1016/j.jcis.2021.06.122. Epub 2021 Jul 02. PMID: 34271488.
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J Colloid Interface Sci. 2021 Dec 15;604:260-271. doi: 10.1016/j.jcis.2021.06.122. Epub 2021 Jul 02.

Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques.

Journal of colloid and interface science

Diana Cholakova, Desislava Glushkova, Zhulieta Valkova, Sonya Tsibranska-Gyoreva, Krastina Tsvetkova, Slavka Tcholakova, Nikolai Denkov

Affiliations

  1. Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy, Sofia University, 1 James Bourchier Avenue, 1164 Sofia, Bulgaria.
  2. Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy, Sofia University, 1 James Bourchier Avenue, 1164 Sofia, Bulgaria. Electronic address: [email protected].

PMID: 34271488 DOI: 10.1016/j.jcis.2021.06.122

Abstract

HYPOTHESIS: Micrometer sized alkane-in-water emulsion drops, stabilized by appropriate long-chain surfactants, spontaneously break symmetry upon cooling and transform consecutively into series of regular shapes (Denkov et al., Nature 2015, 528, 392). Two mechanisms were proposed to explain this phenomenon of drop "self-shaping". One of these mechanisms assumes that thin layers of plastic rotator phase form at the drop surface around the freezing temperature of the oil. This mechanism has been supported by several indirect experimental findings but direct structural characterization has not been reported so far.

EXPERIMENTS: We combine small- and wide-angle X-ray scattering (SAXS/WAXS) with optical microscopy and DSC measurements of self-shaping drops in emulsions.

FINDINGS: In the emulsions exhibiting drop self-shaping, the scattering spectra reveal the formation of intermediate, metastable rotator phases in the alkane drops before their crystallization. In addition, shells of rotator phase were observed to form in hexadecane drops, stabilized by C

Copyright © 2021 Elsevier Inc. All rights reserved.

Keywords: Emulsion; Plastic phase; Rotator phase; SAXS; Self-shaping drops; WAXS

Conflict of interest statement

Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this pa

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