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      Tuning the Porosity of Supraparticles

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          Abstract

          Supraparticles consisting of nano- or microparticles have potential applications as, for example, photonic crystals, drug carriers, or heterogeneous catalysts. To avoid the use of solvent or processing liquid, one can make supraparticles by evaporating droplets of aqueous suspensions from super-liquid-repellent surfaces. Herein, a method to adjust the porosity of supraparticles is described; a high porosity is desired, for example, in catalysis. To prepare highly porous TiO 2 supraparticles, polymer nanoparticles are co-dispersed in the suspension. Supraparticles are formed through evaporation of aqueous suspension droplets on superamphiphobic surfaces followed by calcination of the sacrificial polymer particles. The increase of porosity of up to 92% resulted in enhanced photocatalytic activity while maintaining sufficient mechanical stability.

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          Candle soot as a template for a transparent robust superamphiphobic coating.

          Xu Deng, Lena Mammen, Hans-Jürgen Butt … (2012)
          Coating is an essential step in adjusting the surface properties of materials. Superhydrophobic coatings with contact angles greater than 150° and roll-off angles below 10° for water have been developed, based on low-energy surfaces and roughness on the nano- and micrometer scales. However, these surfaces are still wetted by organic liquids such as surfactant-based solutions, alcohols, or alkanes. Coatings that are simultaneously superhydrophobic and superoleophobic are rare. We designed an easily fabricated, transparent, and oil-rebounding superamphiphobic coating. A porous deposit of candle soot was coated with a 25-nanometer-thick silica shell. The black coating became transparent after calcination at 600°C. After silanization, the coating was superamphiphobic and remained so even after its top layer was damaged by sand impingement.
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            Mesoporous silicon sponge as an anti-pulverization structure for high-performance lithium-ion battery anodes.

            Xiaolin Li, Meng Gu, Shenyang Hu … (2014)
            Nanostructured silicon is a promising anode material for high-performance lithium-ion batteries, yet scalable synthesis of such materials, and retaining good cycling stability in high loading electrode remain significant challenges. Here we combine in-situ transmission electron microscopy and continuum media mechanical calculations to demonstrate that large (>20 μm) mesoporous silicon sponge prepared by the anodization method can limit the particle volume expansion at full lithiation to ~30% and prevent pulverization in bulk silicon particles. The mesoporous silicon sponge can deliver a capacity of up to ~750 mAh g(-1) based on the total electrode weight with >80% capacity retention over 1,000 cycles. The first cycle irreversible capacity loss of pre-lithiated electrode is <5%. Bulk electrodes with an area-specific-capacity of ~1.5 mAh cm(-2) and ~92% capacity retention over 300 cycles are also demonstrated. The insight obtained from this work also provides guidance for the design of other materials that may experience large volume variation during operations.
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              The evaporation of sessile or pendant drops in still air

              R.G Picknett, R Bexon (1977)
              Article 0 comments Cited 153 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): ACS Nano
                Journal ID (iso-abbrev): ACS Nano
                Journal ID (publisher-id): nn
                Journal ID (coden): ancac3
                Title: ACS Nano
                Publisher: American Chemical Society
                ISSN (Print): 1936-0851
                ISSN (Electronic): 1936-086X
                Publication date (Electronic): 02 December 2019
                Publication date (Print): 24 December 2019
                Volume: 13
                Issue: 12
                Pages: 13949-13956
                Affiliations
                Department of Physics at Interfaces, Max Planck Institute for Polymer Research , Ackermannweg 10, D-55128 Mainz, Germany
                Author notes
                [* ]Tel: +49 6131379114. E-mail: kappl@ 123456mpip-mainz.mpg.de .
                Article
                DOI: 10.1021/acsnano.9b05673
                PMC ID: 6933812
                PubMed ID: 31789496
                SO-VID: 2a971d23-c52c-44f2-ad01-0d18f66bce63
                Copyright © Copyright © 2019 American Chemical Society
                License:

                This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.

                History
                Date received : 19 July 2019
                Date accepted : 02 December 2019
                Categories
                Subject: Article
                Custom metadata
                document-id-old-9 nn9b05673
                document-id-new-14 nn9b05673
                ccc-price

                ScienceOpen disciplines: Nanotechnology
                Keywords: supraparticles,porous,evaporation,superamphiphobic surface,photocatalysis
                Data availability:
                ScienceOpen disciplines: Nanotechnology
                Keywords: supraparticles, porous, evaporation, superamphiphobic surface, photocatalysis

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