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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, 32 (23). pp. 9897-9905. ISSN 0897-4756.

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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 on 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 cross-linked with glutaraldehyde. Tunable broadband scattering is observed upon partial removal of the ZnO with complete removal resulting in semirigid 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 topology.

Item Type:Article
Related URLs:
URLURL TypeDescription
Montjoy, Douglas G.0000-0003-3675-8596
Bahng, Joong Hwan0000-0003-0997-9625
Kotov, Nicholas A.0000-0002-6864-5804
Additional Information:© 2020 American Chemical Society. Received: June 12, 2020; Revised: September 9, 2020; Published: September 14, 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”. Some parts of this work were supported by the NSF project “Energy- and Cost-Efficient Manufacturing Employing Nanoparticles” NSF 1463474 and Vannewar Bush DoD Fellowship to N.A.K. titled “Engineered Chiral Ceramics” ONR N000141812876. The authors declare no competing financial interest.
Funding AgencyGrant Number
Electric Power Research Institute (EPRI)UNSPECIFIED
Vannever Bush Faculty FellowshipUNSPECIFIED
Office of Naval Research (ONR)N00014-18-1-2876
Issue or Number:23
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 2020 32 (23), 9897-9905; 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:10 Dec 2020 20:17

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