Impact dynamics of colloidal quantum dot solids

Lejun Qi, Peter H. McMurry, David J. Norris, Steven L. Girshick

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We use aerosol techniques to investigate the cohesive and granular properties of solids composed of colloidal semiconductor nanocrystals (quantum dot solids). We form spherical agglomerates of nanocrystals with a nebulizer and direct them toward a carbon substrate at low (∼0.01 m/s) or high (∼100 m/s) velocities. We then study the morphology of the deposit (i.e., the "splat") after impact. By varying the size of the agglomerate and the spacing between the nanocrystals within it, we observe influences on the mechanical properties of the quantum dot solid. We observe a liquid-to-solid transition as the nanocrystals become more densely packed. Agglomerates with weakly interacting nanocrystals exhibit liquidlike splashing and coalescence of overlapping splats. More dense agglomerates exhibit arching and thickening effects, which is behavior typical of granular materials.

Original languageEnglish (US)
Pages (from-to)12677-12683
Number of pages7
JournalLangmuir
Volume27
Issue number20
DOIs
StatePublished - Oct 18 2011

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