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Synthesis of Cone-Shaped Colloids from Rod-Like Silica Colloids with a Gradient in the Etching Rate

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Download Hi-Res ImageDownload to MS-PowerPointCite This:Langmuir 2016, 32, 16, 3970-3976
    Interface Components: Nanoparticles, Colloids, Emulsions, Surfactants, Proteins, Polymers

    Synthesis of Cone-Shaped Colloids from Rod-Like Silica Colloids with a Gradient in the Etching Rate
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    Soft Condensed Matter, Debye Institute for NanoMaterials Science, Utrecht University, Princetonplein 1, 3584 CC Utrecht, Netherlands
    *E-mail: [email protected]
    *E-mail: [email protected]
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    Langmuir

    Cite this: Langmuir 2016, 32, 16, 3970–3976
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    https://doi.org/10.1021/acs.langmuir.6b00678
    Published April 5, 2016
    Copyright © 2016 American Chemical Society
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    Abstract

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    We present the synthesis of monodisperse cone-shaped silica colloids and their fluorescent labeling. Rod-like silica colloids prepared by ammonia-catalyzed hydrolysis and condensation of tetraethyl orthosilicate in water droplets containing polyvinylpyrrolidone cross-linked by citrate ions in pentanol were found to transform into cone-shaped particles upon mild etching by NaOH in water. The diameter and length of the resulting particles were determined by those of the initial rod-like silica colloids. The mechanism responsible for the cone-shape involves silica etching taking place with a varying rate along the length of the particle. Our experiments thus also lead to new insights into the variation of the local particle structure and composition. These are found to vary gradually along the length of the rod, as a result of the way the rod grows out of a water droplet that keeps itself attached to the flat end of the bullet-shaped particles. Subtle differences in composition and structure could also be resolved by high-resolution stimulated emission depletion confocal microscopy on fluorescently labeled particles. The incorporation of a fluorescent dye chemically attached to an amine-based silane coupling agent resulted in a distribution of fluorophores mainly on the outside of the rod-shaped particles. In contrast, incorporation of the silane coupling agent alone resulted in a homogeneous distribution. Additionally, we show that etching rods, where a silane coupling agent alone was incorporated and subsequently coupled to a fluorescent dye, resulted in fluorescent silica cones, the orientation of which can be discerned using super-resolution confocal microscopy.

    Copyright © 2016 American Chemical Society

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    Cited By

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    This article is cited by 20 publications.

    1. Douglas R. Hayden, Chris L. Kennedy, Krassimir P. Velikov, Alfons van Blaaderen, Arnout Imhof. Seeded-Growth of Silica Rods from Silica-Coated Particles. Langmuir 2019, 35 (46) , 14913-14919. https://doi.org/10.1021/acs.langmuir.9b02847
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    16. J. Brijitta, D. Ramachandran, A. M. Rabel, N. Nixon Raj, K. Viswanathan, S. Sanjeevi Prasath. Evolution of shape isotropy in silica microparticles induced by the base. Colloid and Polymer Science 2017, 295 (9) , 1485-1490. https://doi.org/10.1007/s00396-017-4118-5
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    20. Panos Datskos, Georgios Polizos, David A. Cullen, Mahabir Bhandari, Jaswinder Sharma. Synthesis of Half‐Sphere/Half‐Funnel‐Shaped Silica Structures by Reagent Localization and the Role of Water in Shape Control. Chemistry – A European Journal 2016, 22 (52) , 18700-18704. https://doi.org/10.1002/chem.201604130
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    Langmuir

    Cite this: Langmuir 2016, 32, 16, 3970–3976
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.langmuir.6b00678
    Published April 5, 2016
    Copyright © 2016 American Chemical Society
    Request reuse permissions

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