Department of Mechanical and Industrial Engineering

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https://repository.udsm.ac.tz/handle/123456789/27

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Browsing Department of Mechanical and Industrial Engineering by Author "Bidu, Jerome"

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    Antimicrobial finishing of textiles by modified clay minerals
    (2014-09) Grethe, Thomas; Bidu, Jerome; Mahltig, Boris; Haase, Hajo
    Antimicrobial finished textiles are suitable for a wide range of applications. For instance, they can be advantageous in sportswear, but are also usable for hygienic and medical products. Especially patients suffering from neurodermatitis or diabetes can gain benefits due to a reduced risk for the appearance of secondary infections. An antimicrobial effect can be realized by metal ions from zinc, copper, and silver. An inorganic storage matrix is applied to load the material with these metal ions. Fixation of storage matrices is done by sol-gel-technology. The resulting porous hybrid film allows the ions to diffuse into the surrounding medium.
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    Inorganic Nanosol Coatings for Antimicrobial Treatment of Textiles
    (2014-12) Bidu, Jerome; Grethe, Thomas; Haase, Hajo; Mahltig, Boris
    Antimicrobial functionalized textiles are of high interest due to the wide field of potential applications. The antimicrobial properties can protect the textile itself from decomposition by microorganisms. Further points of interest are the suppression and destruction of pathogenic germs or the support during the therapy of neurodermatitis skin or the diabetic foot. This chapter is related to the development of aqueous finishing agents for realization of antibacterial coatings on textiles. The used finishing agents are based on modified silica nanosols which are the coating forming component in the used composition. The second component is responsible for the antimicrobial properties of the coatings. For this antimicrobial agent, a recipe based on natural layered silicate and metal ions of silver, copper and zinc are used. This composite material acts as storage material releasing the antibacterial active metal ions. The antibacterial activity is tested after application on cotton and polyester fabrics by using two different types of bacteria Escherichia coli and Staphylococcus aureus. By variation of the composition of this nanosol finishing agent, the antibacterial activity can be adjusted in a broad range. This might be especially useful for applications requiring an intermediate antimicrobial activity under consideration of the natural skin flora. Besides testing the antibacterial properties, the prepared textile samples are investigated using light microscopy and scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS) and UV/VIS-spectroscopy. Also the abrasion stability of coatings and textile sam