Relationship between tribology and optics in thin films of mechanically oriented nanocrystals

Liana Wong, Chunhua Hu, Ruthanne Paradise, Zina Zhu, Alexander Shtukenberg, Bart Kahr

Research output: Contribution to journalArticle

Abstract

Many crystalline dyes, when rubbed unidirectionally with cotton on glass slides, can be organized as thin films of highly aligned nanocrystals. Commonly, the linear birefringence and linear dichroism of these films resemble the optical properties of single crystals, indicating precisely oriented particles. Of 186 colored compounds, 122 showed sharp extinction and 50 were distinctly linearly dichroic. Of the latter 50 compounds, 88% were more optically dense when linearly polarized light was aligned with the rubbing axis. The mechanical properties of crystals that underlie the nonstatistical correlation between tribological processes and the direction of electron oscillations in absorption bands are discussed. The features that give rise to the orientation of dye crystallites naturally extend to colorless molecular crystals.

Original languageEnglish (US)
Pages (from-to)12245-12251
Number of pages7
JournalJournal of the American Chemical Society
Volume134
Issue number29
DOIs
StatePublished - Jul 25 2012

Fingerprint

Tribology
Nanoparticles
Nanocrystals
Optics
Coloring Agents
Dyes
Birefringence
Molecular crystals
Thin films
Dichroism
Light polarization
Crystallites
Crystal orientation
Cotton
Glass
Absorption spectra
Optical properties
Single crystals
Electrons
Crystalline materials

ASJC Scopus subject areas

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

Cite this

Relationship between tribology and optics in thin films of mechanically oriented nanocrystals. / Wong, Liana; Hu, Chunhua; Paradise, Ruthanne; Zhu, Zina; Shtukenberg, Alexander; Kahr, Bart.

In: Journal of the American Chemical Society, Vol. 134, No. 29, 25.07.2012, p. 12245-12251.

Research output: Contribution to journalArticle

Wong, Liana ; Hu, Chunhua ; Paradise, Ruthanne ; Zhu, Zina ; Shtukenberg, Alexander ; Kahr, Bart. / Relationship between tribology and optics in thin films of mechanically oriented nanocrystals. In: Journal of the American Chemical Society. 2012 ; Vol. 134, No. 29. pp. 12245-12251.
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