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Omnidispersible Microscale Colloids with Nanoscale Polymeric Spikes

Montjoy, Douglas G. and Hou, Harrison and Bahng, Joong Hwan and Kotov, Nicholas A. (2020) Omnidispersible Microscale Colloids with Nanoscale Polymeric Spikes. Chemistry of Materials . ISSN 0897-4756. (In Press)

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Particle stability in a multiplicity of fluid environments is critical for colloids used in catalysis, sensing, and composites. Hedgehog particles (HPs), inspired by the spiky topology of pollen grains and viral capsids, enable dispersion stability regardless of whether their polarity matches that of the solvent. Previous implementations of HPs were all based raon rigid spikes from inorganic materials, such as ZnO, whereas polymeric spikes offer a unique spectrum of optical, chemical, thermal, and mechanical properties including potential stimuli-responsive behavior. Microscale particles with nanoscale polymeric spikes referred to here as tendril particles, were made by layer-by-layer assembly of polyallylamine films deposited onto rigid ZnO templates and then crosslinked with glutaraldehyde. Tunable broadband scattering is observed upon partial removal of the ZnO with complete removal resulting in semi-rigid hollow polymer sleeves. While being hydrophilic, they disperse in nonpolar media such as heptane and high ionic strength aqueous media. Gradual removal of ZnO nanorods affords spectral tuning of the near-infrared band associated with light scattering from the high refractive index spikes. The polymer spikes also allow for loading of cargo nanoparticles, molecules, and polymers. By adding poly(N-isopropylacrylamide-co-acrylic acid) subunits, controlled aggregation is observed in response to temperature. Structural integration of dopamine moieties into the layered films allows for controlled aggregation in response to alkaline conditions. The mechanical and structural flexibility of tendrils with sleeve-like morphology enables a new generation of multifunctional particles with properties controlled by their nanoscale surface topography.

Item Type:Article
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URLURL TypeDescription
Montjoy, Douglas G.0000-0003-3675-8596
Kotov, Nicholas A.0000-0002-6864-5804
Additional Information:© 2020 American Chemical Society. Received 12 June 2020. Published online 14 September 2020. The authors would like to acknowledge funding from the Electric Power Research Institute. Additionally, the authors would like to acknowledge the Michigan center for Materials Characterization and NSF grants DMR-0315633 and DMR-0320740 for funding of the microscopes in this work. This work was also supported by NSF 1566460 “Nanospiked Particles for Photocatalysis”.
Funding AgencyGrant Number
Electric Power Research Institute (EPRI)UNSPECIFIED
Record Number:CaltechAUTHORS:20200915-115018180
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Official Citation:Omnidispersible Microscale Colloids with Nanoscale Polymeric Spikes Douglas G. Montjoy, Harrison Hou, Joong Hwan Bahng, and Nicholas A. Kotov Chemistry of Materials Just Accepted Manuscript DOI: 10.1021/acs.chemmater.0c02472
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105386
Deposited By: George Porter
Deposited On:15 Sep 2020 20:11
Last Modified:15 Sep 2020 20:11

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