5
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Slippery damper of an overlay for arresting and manipulating droplets on nonwetting surfaces

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          In diverse processes, such as fertilization, insecticides, and cooling, liquid delivery is compromised by the super-repellency of receiving surfaces, including super-hydro-/omni-phobic and superheated types, a consequence of intercalated air pockets or vapor cushions that promote droplet rebounds as floating mass-spring systems. By simply overlaying impacting droplets with a tiny amount of lubricant (less than 0.1 vol% of the droplet), their interfacial properties are modified in such a way that damper-roller support is attached to the mass-spring system. The overlayers suppress the out-of-plane rebounds by slowing the departing droplets through viscous dissipation and sustain the droplets’ in-plane mobility through self-lubrication, a preferential state for scenarios such as shedding of liquid in spray cooling and repositioning of droplets in printing. The footprint of our method can be made to be minimal, circumventing surface contamination and toxification. Our method enables multifunctional and dynamic control of droplets that impact different types of nonwetting surfaces.

          Abstract

          Controlled deposition of droplets on super-repellent surfaces is a challenging task in many practical applications. Han et al. show that already a rather thin encapsulating film of a highly viscous liquid can fine tune droplet impact as to suppress both rebound and splash.

          Related collections

          Most cited references48

          • Record: found
          • Abstract: found
          • Article: found
          Is Open Access

          In situ click chemistry generation of cyclooxygenase-2 inhibitors

          Cyclooxygenase-2 isozyme is a promising anti-inflammatory drug target, and overexpression of this enzyme is also associated with several cancers and neurodegenerative diseases. The amino-acid sequence and structural similarity between inducible cyclooxygenase-2 and housekeeping cyclooxygenase-1 isoforms present a significant challenge to design selective cyclooxygenase-2 inhibitors. Herein, we describe the use of the cyclooxygenase-2 active site as a reaction vessel for the in situ generation of its own highly specific inhibitors. Multi-component competitive-binding studies confirmed that the cyclooxygenase-2 isozyme can judiciously select most appropriate chemical building blocks from a pool of chemicals to build its own highly potent inhibitor. Herein, with the use of kinetic target-guided synthesis, also termed as in situ click chemistry, we describe the discovery of two highly potent and selective cyclooxygenase-2 isozyme inhibitors. The in vivo anti-inflammatory activity of these two novel small molecules is significantly higher than that of widely used selective cyclooxygenase-2 inhibitors.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

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

            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.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Monodisperse double emulsions generated from a microcapillary device.

              Double emulsions are highly structured fluids consisting of emulsion drops that contain smaller droplets inside. Although double emulsions are potentially of commercial value, traditional fabrication by means of two emulsification steps leads to very ill-controlled structuring. Using a microcapillary device, we fabricated double emulsions that contained a single internal droplet in a core-shell geometry. We show that the droplet size can be quantitatively predicted from the flow profiles of the fluids. The double emulsions were used to generate encapsulation structures by manipulating the properties of the fluid that makes up the shell. The high degree of control afforded by this method and the completely separate fluid streams make this a flexible and promising technique.
                Bookmark

                Author and article information

                Contributors
                tangxin@connect.hku.hk
                lqwang@hku.hk
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                26 May 2021
                26 May 2021
                2021
                : 12
                : 3154
                Affiliations
                [1 ]GRID grid.194645.b, ISNI 0000000121742757, Department of Mechanical Engineering, , The University of Hong Kong, ; Hong Kong, Hong Kong
                [2 ]GRID grid.194645.b, ISNI 0000000121742757, Zhejiang Institute of Research and Innovation, , The University of Hong Kong, ; Hangzhou, Zhejiang China
                [3 ]GRID grid.263817.9, Department of Mechanics and Aerospace Engineering, , Southern University of Science and Technology, ; Shenzhen, Guangdong China
                Author information
                http://orcid.org/0000-0002-7004-8494
                http://orcid.org/0000-0002-6514-4211
                Article
                23511
                10.1038/s41467-021-23511-3
                8154893
                34039984
                24b288a9-9baf-42e6-8720-570c60b8c2d6
                © The Author(s) 2021

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 20 August 2020
                : 22 April 2021
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100002920, Research Grants Council, University Grants Committee (RGC, UGC);
                Award ID: GRF17204420
                Award ID: GRF17210319
                Award ID: GRF17204718
                Award ID: GRF17237316
                Award ID: CRF C1018-17G
                Award Recipient :
                Categories
                Article
                Custom metadata
                © The Author(s) 2021

                Uncategorized
                surfaces, interfaces and thin films,applied physics,fluid dynamics
                Uncategorized
                surfaces, interfaces and thin films, applied physics, fluid dynamics

                Comments

                Comment on this article