Browsing by Author "Coetzee, Divan"

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    Carbon coating to impart electrical conductivity to textile material
    Coetzee, Divan; Wiener Jakub, prof. Ing. Ph.D. : 55161
    An epoxy/PEI/carbon coating was developed containing differing amounts of graphene or graphite to impart electrical conductivity onto a nonwoven viscose textile. It was found that an increase in carbon filler content resulted in increased electrical conductivity and that multiple coatings improved electrical conductivity further. Decyl glucoside surfactant improved particle mixing without influencing electrical conductivity. The coated material exhibited a minimum electrical resistivity in the megaohm range which makes it a relatively weak electrical conductor, however it can be considered as antistatic. The samples indicated no EMI shielding in the 30 MHz - 3 GHz range.
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    GARMENT DURABILITY ANALYSIS – INFLUENCE OF TEXTILE MAINTENANCE
    (Technical University of Liberec, ) Wiener, Jakub; Šubrová, Tereza; Coetzee, Divan; Technická univerzita v Liberci
    Textiles used in clothing pose a large environmental burden from their initial manufacturing, maintenance and end of life. Garment production is a major problem whose environmental impacts can be easily quantified since it is a defined production process. To implement sustainable processes, it is necessary to evaluate the entire life cycle of a garment, including its maintenance and end-of-life. In this study, the maintenance phase of the garment is investigated. The garment maintenance is divided into real applied steps, and these individual steps are analysed in terms of raw material especially regarding potential/real damage to the treated garment fabric. The different maintenance steps are contextualised by the survey and results of the questionnaire used for the study. This investigated which gentle maintenance practices the respondents use in practice. The source of the analysed data is a questionnaire survey made in the Czech Republic. The result is a thorough analysis of the maintenance practices associated with garments and an analysis of ways to extend the lifetime of garments and thus reduce their environmental burden caused by excessive waste generation.
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    Influence of Nanoparticles on Thermal and Electrical Conductivity of Composites
    (MDPI, 2020-03-27) Coetzee, Divan; Venkataraman, Mohanapriya; Militký, Jiří; Petrů, Michal
    This review analyzes thermal and electrically conductive properties of composites and how they can be influenced by the addition of special nanoparticles. Composite functional characteristics—such as thermal and electrical conductivity, phase changes, dimensional stability, magnetization, and modulus increase—are tuned by selecting suitable nanoparticle filler material. The conductivity of composites can be related to the formation of conductive pathways as nanofiller materials form connections in the bulk of a composite matrix. With increasing use of nanomaterial containing composites and relatively little understanding of the toxicological effects thereof, adequate disposal and recyclability have become an increasing environmental concern.