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  • 1.
    Malm, Veronica
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. University of Borås.
    Tadesse Abate, Molla
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Supercritical Carbon Dioxide: A Sustainable Medium For Textile Dyeing And Finishing To Expand The Possibilities For A Resource Efficient Production Technology2019In: Autex 19th World Textile Conference: Textiles at the Crossroads, 2019, 2019Conference paper (Other academic)
    Abstract [en]

    In our research group focusing on resource efficient processes, we explore the waterless supercritical carbon dioxide (SC-CO2) technology as a promising sustainable alternative to the traditional textile wet dyeing and water based finishing processes. Already, it is industrially implemented for textile dyeing, in particular for synthetic fabrics, and, being a dry color process it is regarded as only using ¼ of the physical footprint compared to conventional dyeing. This, does not only account for water and energy savings, but also includes advantages such as reduced emissions of harmful effluents, less amount of used dye, no or minimal use of auxiliaries (dispersing agents, carriers and surfactants) and low waste of material. To expand the industrial capabilities of this technology and open up for new business opportunities, our research focuses on textile functionalization in SC-CO2, either by only applying a functional material or to combine dyeing and functionalization of fabric in a single-step process. For polyethylene terephthalate (PET) fabric dyeing (step 1) and functionalization (step 2) in a sequential process where similar processing parameters (high temperature and pressure) was used, it was found that the color was extracted in the second step. The PET dyeing kinetics using SC-CO2 as a solvent depend on the transition in the amorphous regions of the fiber and diffusion properties and solvating power of the SC-CO2 with the dye. Hence, extensive studies on compatibility between fiber, dye and functional compounds include solubility of dye and functional material in SC-CO2, optimization of process parameters (pressure and temperature) and depressurization. This is crucial for understanding the adhesion mechanism between fiber and chemicals, and, particularly for a proper adhesion with a durable functional performance. Furthermore, as SC-CO2 is a good solvent for hydrophobic compounds, nonionics and organic compounds with low molecules weight, there are challenges in modifying conventional compound or using co-solvents. Activities within this domain in our research group stretch between dyeing and functionalization of textiles with end-use properties such as antimicrobial, photochromic, moisture management, water repellency, soil repellency and flame retardant.

  • 2.
    Nierstrasz, Vincent
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Johansson, Mats
    University of Borås, Faculty of Textiles, Engineering and Business.
    Niit, Ellinor
    University of Borås, Faculty of Textiles, Engineering and Business.
    Tadesse Abate, Molla
    University of Borås, Faculty of Textiles, Engineering and Business.
    Functionalization of textiles in supercritical CO22016In: 55th Man Made Fiber Conference / Dornbirn MFC, 2016Conference paper (Refereed)
  • 3.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Ferri, Ada
    Department of Applied Science and Technology, Politecnico di Torino.
    Guan, Jinping
    College of Textile and Clothing Engineering, Soochow University.
    Chen, Guoqiang
    College of Textile and Clothing Engineering, Soochow University.
    Ferreira, Jorge
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Single-step disperse dyeing and antimicrobial functionalization of polyester fabric with chitosan and derivative in supercritical carbon dioxide2019In: Journal of Supercritical Fluids, ISSN 0896-8446, E-ISSN 1872-8162, Vol. 147, p. 231-240Article in journal (Refereed)
    Abstract [en]

    In this study, a novel green approach was adopted to develop antimicrobial polyester fabric using sustainable biopolymers (chitosan/derivative) as eco-friendly antimicrobial agents via the resource efficient supercritical CO2 (scCO2) dyeing route in a single step. Polyester fabric was dyed with a small amount of dye (0.4% owf) in the presence of chitosan/derivative (3% owf) in scCO2 at 120 °C, 25 MPa for 1 h. The success of chitosan/derivative impregnation was confirmed by Fourier Transform Infrared (FTIR), Zeta Potential (ζ), Scanning Electron Microscopy (SEM), and Water Contact Angle (WCA) measurements. According to the result, excellent color strength and fastness properties were obtained and the treated samples also reduced 75 − 93% of Escherichia coli (ATCC 25922) bacteria within one hour. This suggests that the dye and chitosan/derivative had no adverse effect on each other, proving compatibility. This new approach would help to reduce the cost of production and environmental pollution associated with the conventional textile finishing processes.

  • 4.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Ferri, Ada
    Department of Applied Science and Technology, Politecnico di Torino.
    Guan, Jinping
    College of Textile and Clothing Engineering, Soochow University.
    Chen, Guoqiang
    College of Textile and Clothing Engineering, Soochow University.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Colouration and bio-activation of polyester fabric with curcumin in supercritical CO2: Part I - Investigating colouration properties2019In: The Journal of Supercritical Fluids, ISSN 0896-8446Article in journal (Refereed)
  • 5.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Combined Pre-treatment and Causticization of cotton fabric for improved dye uptake2017In: Advance Research in Textile Engineering, ISSN 2572-9373, Vol. 2, no 1, article id 1016Article in journal (Refereed)
    Abstract [en]

    Conventionally, cotton fabric is subjected to a series of separate pretreatment processes such as desizing, scouring, and bleaching to remove natural and added impurities for satisfactory dyeing and finishing. When the sole purpose is to improve the dye uptake, cotton fabric is subjected to yet another separate process called causticization, a treatment of cotton fabric at reduced concentration of caustic soda (110-150 g/L) compared to mercerization. All these processes i.e. desizing, scouring, and bleaching are lengthy and require large amount of water, energy, chemicals, and time which lead to increase in cost and productivity loss.

    In this paper, a combined desizing, scouring, bleaching and causticization process with shorter processing time is reported. Single factor randomized experimental design was used for process optimization. Based on experiments, the optimum recipe consisted of padding the gray cotton fabric using a twodip, two-nip technique in a bath containing NaOH 140g/L; Sodium Per Borate (SPB) 40-45g/L; wetting agent 1g/L, batching for 30 min at room temperature and washing the treated fabric with 1g/L emulsifier twice for 15 minutes each at boil with 3% owf SPB added during the second wash, rinsed with hot and cold water and air dried.

    The results showed excellent wettability, good degree of whiteness, minimum loss of tensile strength and higher dye uptake compared to uncausticized commercially bleached cotton fabric.

  • 6.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Combined Pre-treatment and Causticization of cotton fabric for improved dye uptake2017In: Advance Research in Textile Engineering, ISSN 2572-9373, Vol. 2, no 1, article id 1016Article in journal (Refereed)
    Abstract [en]

    Conventionally, cotton fabric is subjected to a series of separate pretreatment processes such as desizing, scouring, and bleaching to remove natural and added impurities for satisfactory dyeing and finishing. When the sole purpose is to improve the dye uptake, cotton fabric is subjected to yet another separate process called causticization, a treatment of cotton fabric at reduced concentration of caustic soda (110-150 g/L) compared to mercerization. All these processes i.e. desizing, scouring, and bleaching are lengthy and require large amount of water, energy, chemicals, and time which lead to increase in cost and productivity loss.

    In this paper, a combined desizing, scouring, bleaching and causticization process with shorter processing time is reported. Single factor randomized experimental design was used for process optimization. Based on experiments, the optimum recipe consisted of padding the gray cotton fabric using a twodip, two-nip technique in a bath containing NaOH 140g/L; Sodium Per Borate (SPB) 40-45g/L; wetting agent 1g/L, batching for 30 min at room temperature and washing the treated fabric with 1g/L emulsifier twice for 15 minutes each at boil with 3% owf SPB added during the second wash, rinsed with hot and cold water and air dried.

    The results showed excellent wettability, good degree of whiteness, minimum loss of tensile strength and higher dye uptake compared to uncausticized commercially bleached cotton fabric.

  • 7.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Eco-friendly antimicrobial functionalization and dyeing of PET fabrics using supercritical carbon dioxide2017Conference paper (Other academic)
  • 8.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Impregnation of Materials in Supercritical CO2 to Impart Various Functionalities2019In: Advanced Supercritical Fluids Technologies [Working Title] / [ed] Prof. Igor Leonardovich Pioro, UNITED KINGDOM: InTech, 2019Chapter in book (Other academic)
  • 9.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. University of Boras.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Supercritical CO2 technology for simultaneous dyeing and antimicrobial functionalization of PET fabrics2018Conference paper (Other academic)
  • 10.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Supercritical CO2 technology in resource effective textile production of functional textiles2017Conference paper (Other academic)
    Abstract [en]

    Supercritical CO2 (SC-CO2) textile processing is a water-free technology with significant savings in energy, chemicals, and wastewater while producing high-quality products thereby creating new business opportunities. It is an attractive alternative to both water and organic solvent since it is inexpensive, essentially nontoxic, nonflammable, environmentally friendly and requires relatively low critical temperature 310c and pressure 7.38 Mpa which can easily be recaptured and recycled after use.

    Today supercritical CO2 dyeing of PET has come up to the commercial level. The Netherlands-based company, DyeCoo Textile Systems, was the first to launch commercial SC-CO2 dyeing system. Meanwhile, SC-CO2 is a resource efficient, flexible, and ecological textile production which could be a suitable technology for textile functionalization. However, there are limited studies on the potential use of this technology for the production of smart and functional textiles. Furthermore, unlike dyes, fundamental understanding of the solubility and transport (kinetics) properties of functional compounds is lacking.

    The aim of this research project is to develop sustainable functional and smart textile materials using SC-CO2 technology. It will focus on combined dyeing and functionalization (antimicrobial, medical/care, and flame retardant) of woven and knitted synthetic textiles using SC-CO2. Preliminary experiments have been conducted to develop antimicrobial polyester fabric in SC-CO2 and a promising result is found. Furthermore, characterization of the functionalized fabric (surface property, wettability), the release kinetics of active principles from textiles (Franz cell device, HPLC) and the skin physiology after the contact with a functionalized fabric (cutometer) will be investigated. 

  • 11.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Viková, M
    Department of Material Engineering; Faculty of Textile Engineering; Technical University of Liberec.
    Vik, M
    Department of Material Engineering; Faculty of Textile Engineering; Technical University of Liberec.
    Ferri, A
    3 Department of Applied Science and Technology, Politecnico di Torino.
    Jinping, G
    College of Textile and Clothing Engineering, Soochow University.
    Chen, G
    College of Textile and Clothing Engineering, Soochow University.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Comparison of the photochromic behaviour of dyes in solution and on polyester fabric applied by supercritical carbon dioxide2019Conference paper (Other academic)
    Abstract [en]

    Photochromic textiles are of considerable interest for smart and functional textile applications due to their remarkable dynamic colour changing effect when irradiated with light of a certain wavelength. The use of resource efficient processes, such as digital inkjet printing and supercritical carbon dioxide (scCO2) dyeing techniques enables an economic production of those high-end functional products with high material costs. In this study, photochromic polyester fabric has been prepared by applying two commercially important photochromic dyes from spirooxazine (SO) and naphthopyran (NP) dye classes using scCO2-dyeing technique. The properties of scCO2 dyed photochromic fabrics were compared with the properties of the same dyes in a non-polar solvent, hexane. UV-Vis spectroscopy and a specially designed online colour measurement system capable of simultaneous UV irradiation and colour measurement were used to evaluate the photochromic colour behaviour. Both photochromic dye types embedded in textile as well as in solution showed significant reversible colour changing properties when exposed to UV light and revert to their original non-coloured form when the UV light is removed. The scCO2 dyed polyester fabrics exhibited similar trends of colour build-up as in solution, while contrasting behaviour was observed in terms of colour changing rates compared to their behaviour in solution.

1 - 11 of 11
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