Twisted mannitol crystals establish homologous growth mechanisms for high-polymer and small-molecule ring-banded spherulites

Alexander G. Shtukenberg, Xiaoyan Cui, John Freudenthal, Erica Gunn, Eric Camp, Bart Kahr

Research output: Contribution to journalArticlepeer-review

Abstract

d-Mannitol belongs to a large and growing family of crystals with helical morphologies (Yu, L. J. Am. Chem. Soc.2003, 125, 6380). Two polymorphs of d-mannitol, α and δ, when grown in the presence of additives such as poly(vinylpyrrolidone) (PVP) or d-sorbitol, form ring-banded spherulites composed of handed helical fibrils, where the helix axes correspond to the radial growth directions. The two polymorphs form helices with opposite senses in the presence of PVP but the same sense in the presence of d-sorbitol. The characteristic dimensions of the fibrils, including thickness, aspect ratio, and pitch, were determined by scanning probe and electron microscopies. These values must form the basis of any theory that presupposes what forces give rise to crystal twisting, a problem that has been broached but unsettled in the literature of polymer crystallization. The interdependence of the rhythmic variations of both linear and circular birefringence, as determined by Mueller matrix microscopy, informs the cooperative organization of mannitol fibers. The microstructure of mannitol ring-banded spherulites compares favorably to that of high polymers and is evaluated within the context of current theories of crystal twisting.

Original languageEnglish (US)
Pages (from-to)6354-6364
Number of pages11
JournalJournal of the American Chemical Society
Volume134
Issue number14
DOIs
StatePublished - Apr 11 2012

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Twisted mannitol crystals establish homologous growth mechanisms for high-polymer and small-molecule ring-banded spherulites'. Together they form a unique fingerprint.

Cite this