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Tunable assembly of hybrid colloids induced by regioselective depletion

Journal Article · · Nature Materials
 [1];  [2];  [2];  [3];  [2]
  1. New York Univ. (NYU), NY (United States). Molecular Design Institute; NYU
  2. New York Univ. (NYU), NY (United States). Molecular Design Institute
  3. New York Univ. (NYU), NY (United States). Center for Soft Matter Research; New York Univ. (NYU), Brooklyn, NY (United States). Tandon School of Engineering
Assembling colloidal particles using site-selective directional interactions into predetermined colloidal superlattices with desired properties is broadly sought-after, but challenging to achieve. Here in this paper, we exploit regioselective depletion interactions to engineer the directional bonding and assembly of non-spherical colloidal hybrid microparticles. We report that the crystallization of a binary colloidal mixture can be regulated by tuning the depletion conditions. Subsequently, we fabricate triblock biphasic colloids with controlled aspect ratios to achieve regioselective bonding. Without any surface treatment, these biphasic colloids assemble into various colloidal superstructures and superlattices featuring optimized pole-to-pole or center-to-center interactions. Additionally, we observe polymorphic crystallization, quantify the abundancy of each form using algorithms we developed, and investigate the crystallization process in real time. We demonstrate selective control of attractive interactions between specific regions on an anisotropic colloid with no need of site-specific surface functionalization, leading to a general method for achieving colloidal structures with yet unforeseen arrangements and properties.
Research Organization:
New York Univ. (NYU), NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0007991
OSTI ID:
1659477
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 12 Vol. 19; ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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