Assembly and Dynamic Analysis of Square Colloidal Crystals via Templated Capillary Assembly

Cicely Shillingford, Veronica Grebe, Angus McMullen, Jasna Brujic, Marcus Weck

Research output: Contribution to journalArticle

Abstract

Capillary assembly has the ability to engineer centimeter-sized regions of discrete colloidal superstructures and microarrays. However, its use as a tool for directing crystallization of colloids into surface-bound nonclose-packed arrays is limited. Furthermore, the use of quantitative particle tracking tools to investigate evaporative assembly dynamics is rarely employed. In this contribution, we use templated capillary assembly to fabricate square-packed lattices of spherical, organosilica colloids using designed patterned boundaries. Particle tracking algorithms reveal that the assembly of square-packed regions is controlled by the interplay between confinement-driven nuclei formation and osmotic pressure-driven restructuring. We find that the incorporation of a square template increases the yield of particles bearing four nearest neighbors (Zn = 4) from 4 to 39%, obtained using a heavier and more viscous solvent. Maximal square-packed domains occur at specific initial particle concentrations (1.75-2.25 wt % or ψ = 0.013-0.017), indicating that rearrangements are a function of osmotic force. We use particle tracking methods to dynamically monitor conversions between square and hexagonal packing, revealing a cyclical transition between 4 and 6 coordinated particles throughout meniscus recession. Our method is highly scalable and inexpensive and can be adapted for use with different particle sizes and compositions, as well as for targeted open-packed geometries. Our findings will inform the large area, defect-free assembly of nonclose-packed lattices of unexplored varieties that are necessary for the continued expansion of colloid-based materials with vast applications in optical electronics.

Original languageEnglish (US)
Pages (from-to)12205-12214
Number of pages10
JournalLangmuir
Volume35
Issue number37
DOIs
StatePublished - Sep 17 2019

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Dynamic analysis
assembly
Colloids
Crystals
crystals
colloids
Bearings (structural)
Microarrays
Crystallization
recession
Particles (particulate matter)
osmosis
menisci
Electronic equipment
Particle size
engineers
Engineers
Defects
Geometry
templates

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Assembly and Dynamic Analysis of Square Colloidal Crystals via Templated Capillary Assembly. / Shillingford, Cicely; Grebe, Veronica; McMullen, Angus; Brujic, Jasna; Weck, Marcus.

In: Langmuir, Vol. 35, No. 37, 17.09.2019, p. 12205-12214.

Research output: Contribution to journalArticle

Shillingford, Cicely ; Grebe, Veronica ; McMullen, Angus ; Brujic, Jasna ; Weck, Marcus. / Assembly and Dynamic Analysis of Square Colloidal Crystals via Templated Capillary Assembly. In: Langmuir. 2019 ; Vol. 35, No. 37. pp. 12205-12214.
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