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  • 1.
    Masood, Asad
    et al.
    Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
    Ahmed, Naeem
    Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
    Shahid, Fatima
    Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
    Wee, M. F. Mohd Razip
    Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
    Patra, Anuttam
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
    Siow, Kim S.
    Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
    Atmospheric Pressure Plasma Polymerization of Carvone: A Promising Approach for Antimicrobial Coatings2023In: Coatings, ISSN 2079-6412, Vol. 13, no 6, article id 1112Article in journal (Refereed)
    Abstract [en]

    Medical devices are often vulnerable to colonization by nosocomial pathogens (bacteria), leading to infections. Traditional sterilization methods may not always be effective, and as a result, alternative options are being explored to prevent microbial contamination. Recently, scientists are emphasizing using plant-derived essential oils that possess inherent antibacterial properties to produce antimicrobial coatings using plasma polymerization technology carried out at atmospheric pressure (AP). This approach shows promise compared to other coating strategies that need several processing steps, including a high-vacuum system, and are laborious, such as the immobilization of antimicrobial materials on precoated layers in the low-pressure plasma polymerization approach. The present study demonstrates the potential of AP plasma polymerization for producing thin films with excellent antibacterial properties and surface characteristics. The resulting coatings are stable, smooth, and have high wettability, making them ideal for repelling bacteria. The calculated zeta potential and deposition rate for the films are also favorable. These AP plasma-polymerized thin films created from carvone show a reduction rate of more than 90% for Escherichia coli and Staphylococcus aureus bacteria. Our computational docking studies also reveal strong binding interactions between the original carvone monomer and both bacteria. The study suggests that these AP plasma-produced coatings have great potential as antibacterial coatings for biomedical devices.

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  • 2.
    Mazela, Bartłomiej
    et al.
    Faculty of Forestry and Wood Technology, Poznań University of Life Sciences, Wojska Polskiego 28, 60637 Poznań, Poland.
    Tomkowiak, Karolina
    Faculty of Forestry and Wood Technology, Poznań University of Life Sciences, Wojska Polskiego 28, 60637 Poznań, Poland.
    Jones, Dennis
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. Department of Wood Processing and Biomaterials, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Kamýcká 1176, Praha 6-Suchdol, 16521 Prague, Czech Republic.
    Strength and Moisture-Related Properties of Filter Paper Coated with Nanocellulose2022In: Coatings, ISSN 2079-6412, Vol. 12, no 10, article id 1376Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to assess selected properties of coatings incorporating nanocellulose, with the potential of being applied as a surface modification for cellulosic and lignocellulosic materials, particularly for applications within biodegradable packaging. Cellulose nanocrystal (CNC) and cellulose nanofibril (CNF) coatings were produced and applied on both sides of pure cellulose samples in the form of filter paper with a Mayer bar. Selected organosilicon compounds, albumin, and the TEMPO reagent were used as additional modifying substances. Coating parameters were determined, such as water contact angle, water absorption, hygroscopicity, and tensile strength. The presence of the coatings resulted in a significant increase in water vapor absorption by the substrate. Nanocellulose coatings proved to be sensitive to the water vapor and showed no barrier properties against it. However, the samples coated with nanocellulose had a noticeably lower tendency to absorb liquid water. The samples coated with modifying substances had a contact angle of ≥90°, proving that such coatings were an additional barrier to the penetration of liquid water. In the case of cellulose material coated with nanocellulose (i.e., without the addition of silane), there was no barrier effect established, thereby allowing full wetting of the substrate. The nanocellulose coatings increased the tensile strength of the samples. This increase was observed for all tested coating variants. The results obtained offer several potential routes to the manufacture of more environmentally friendly coatings and packaging materials.

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    fulltext
  • 3.
    Tkachov, Roman
    et al.
    Institute of Materials Science, Technische Universität Dresden, Dresden, Germany; Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS), Dresden, Germany.
    Stepien, Lukas
    Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS),Dresden, Germany.
    Greifzu, Moritz
    Institute of Materials Science, Technische Universität Dresden, Dresden, Germany; Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS), Dresden, Germany.
    Kiriy, Anton
    Leibniz-Institut für Polymerforschung Dresden e.V. (IPF), Dresden, Germany.
    Kiriy, Nataliya
    Leibniz-Institut für Polymerforschung Dresden e.V. (IPF), Dresden, Germany.
    Schüler, Tilman
    Institute of Aerospace Engineering, Technische Universität Dresden, Dresden, Germany.
    Schmiel, Tino
    Institute of Aerospace Engineering, Technische Universität Dresden, Dresden, Germany.
    López, Elena
    Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS), Dresden, Germany.
    Brückner, Frank
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS),Dresden, Germany.
    Leyens, Christoph
    Institute of Materials Science, Technische Universität Dresden, Dresden, Germany; Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS), Dresden, Germany.
    A Printable Paste Based on a Stable n-Type Poly[Ni-tto] Semiconducting Polymer2019In: Coatings, ISSN 2079-6412, Vol. 9, no 11, article id 764Article in journal (Refereed)
    Abstract [en]

    Polynickeltetrathiooxalate (poly[Ni-tto]) is an n-type semiconducting polymer having outstanding thermoelectric characteristics and exhibiting high stability under ambient conditions. However, its insolubility limits its use in organic electronics. This work is devoted to the production of a printable paste based on a poly[Ni-tto]/PVDF composite by thoroughly grinding the powder in a ball mill. The resulting paste has high homogeneity and is characterized by rheological properties that are well suited to the printing process. High-precision dispenser printing allows one to apply both narrow lines and films of poly[Ni-tto]-composite with a high degree of smoothness. The resulting films have slightly better thermoelectric properties compared to the original polymer powder. A flexible, fully organic double-leg thermoelectric generator with six thermocouples was printed by dispense printing using the poly[Ni-tto]-composite paste as n-type material and a commercial PEDOT-PSS paste as p-type material. A temperature gradient of 100 K produces a power output of about 20 nW.

  • 4.
    Wu, Jian
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Yin, Xiang
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Mu, Liwen
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Feng, Xin
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Lu, Xiaohua
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Shi, Yijun
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Hollow IF-MoS2/r-GO Nanocomposite Filled Polyimide Coating with Improved Mechanical, Thermal and Tribological Properties2021In: Coatings, ISSN 2079-6412, Vol. 11, no 1, article id 25Article in journal (Refereed)
    Abstract [en]

    Polyimide (PI) is one of the most excellent polymers for coating. However, the high friction coefficient and the high wear rate of pure PI limit its further applications. In this work, the hollow inorganic fullerene-like MoS2/reduced graphene oxide (HIF-MoS2/r-GO) nanocomposite filled PI coating is prepared by in situ polymerization. Reinforcement in mechanical strength and thermal stability is realized on the PI composite coating with incorporation of HIF-MoS2/r-GO, which performs better than carbon nanofiber (CNF). Reduced elastic modulus and hardness of HIF-MoS2/r-GO/PI coating is increased by 8.3% and 4.8%, respectively. The addition of HIF-MoS2/r-GO also results in 24% higher residual mass at 800 °C than CNF. Tribological study indicates that, HIF-MoS2/r-GO/PI achieves a wear rate reduction of 79% compared with pure PI under dry sliding condition, which is much more effective than other nanofillers including CNF, r-GO nanosheets and MoS2 nanoparticles. Under ionic liquid-lubricated condition, the presence of HIF-MoS2/r-GO in PI results in a 30% reduction in wear rate and 10% reduction in friction coefficient as compared to pure PI. It is thought that the HIF-MoS2/r-GO in PI can be slowly released to the frictional interface and form a protective film during sliding, in this way the aggregation problem is successfully solved.

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