TransForm: Injection moulded 3D superhydrophobic surfaces

Carl Esben Poulsen (Lecturer)

    Activity: Talks and presentationsConference presentations

    Description

    Fluorinated coatings are widely used for non-stick cooking utensils, as spray-on for stain prevention on fabrics and for single use laboratory utensils such as sample tubes and pipette tips. In the latter examples, the superhydrophobic surface is of high importance since it ensures high dosing precision and reduces waste due to the high contact angle between the sample and the fluorinated coating. Unfortunately, the applicability of fluorinated compounds is limited due to the acute or long term toxic effects when inhaled[1], [2] or ingested[3]. Alternatively, a superhydrophobic Cassie-Baxter state can be achieved by introducing micro- and nano-structures on a hydrophobic substrate[4]. However, no micro- and nano structuring methods for modifying commercial relevant mould materials, such as tool steel, exist.
    We have developed a patent pending method for selective 3D-structuring conventional moulds for polymer injection moulding such that injection moulded pieces possess localised superhydrophobic wetting properties. We have demonstrated our technology in several aluminium alloys, as well as tool steel, that are typical for mould making - and superhydrophobic polymer pieces have been injection moulded.

    [1]G. M. F. Wallace and P. H. Brown, “Horse rug lung: toxic pneumonitis due to fluorocarbon inhalation.,” Occup. Environ. Med., vol. 62, no. 6, pp. 414–6, Jun. 2005.
    [2]C. J. Johnston, J. N. Finkelstein, P. Mercer, N. Corson, R. Gelein, and G. Oberdörster, “Pulmonary effects induced by ultrafine PTFE particles.,” Toxicol. Appl. Pharmacol., vol. 168, no. 3, pp. 208–15, Nov. 2000.
    [3]M. Sakata, H. Kazama, A. Miki, A. Yoshida, M. Haga, and M. Morita, “Acute toxicity of fluorocarbon-22: Toxic symptoms, lethal concentration, and its fate in rabbit and mouse,” Toxicol. Appl. Pharmacol., vol. 59, no. 1, pp. 64–70, Jun. 1981.
    [4]E. Puukilainen, T. Rasilainen, M. Suvanto, and T. a Pakkanen, “Superhydrophobic polyolefin surfaces: controlled micro- and nanostructures,” Langmuir, vol. 23, no. 13, pp. 7263–8, Jun. 2007.

    Den fulde forfatterliste til projektet er Carl Esben Poulsen Kasper Kistrup Nis Korsgaard Andersen Rafael Taboryski Mikkel Fougt Hansen Anders Wolff Alle er fra DTU Nanotech og bedes angivet online. Tak for hjælpen.
    Period17 Dec 2014
    Event titleDTU Sustain Conference 2014
    Event typeConference
    LocationLyngby, Denmark