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  • 1.
    Tadesse, Melkie Getnet
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Harpa, Rodica
    GA Technical University of IASI.
    Chen, Yan
    Soochow University.
    Wang, Lichuan
    Soochow University.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Loghin, Carmen
    GA Technical University of IASI.
    Assessing the comfort of functional fabrics for smart clothing using subjective evaluation2019In: Journal of Industrial Textiles, ISSN 1528-0837, E-ISSN 1530-8057, Vol. 48, no 8, p. 1310-1326Article in journal (Refereed)
    Abstract [en]

    Sensory investigations of the functional textiles could be an alternative for the quality-inspection and control of the products. The purpose of this research is to use subjective evaluation technique for assessing the tactile comfort of some functional textile fabrics based on AATCC Evaluation procedure 5-2011. Blind subjective evaluations and visual subjective evaluations were performed for sensory investigation. Ten fabric-skin-contact and comfort-related sensory properties were used to evaluate the handle of the functional textile fabrics. The reliability of the sensorial data obtained by subjective tests was evaluated using statistical data analysis techniques. A minimum and maximum consensus distance recorded were 0.58 and 1.61, respectively, using a descriptive sensory panel analysis and prove the consistency and similar sensorial perception between panelists. The Pearson correlation coefficient between panelists was up to 96% and hence a strong agreement between the panelist’s judgment. The results allowed to consider the subjective evaluation using a panel of experts could be validated in the case of functional fabrics. For functional textiles, additional visual subjective evaluation should be considered to have a similar human perception in addition to blind subjective evaluation.

  • 2.
    Tadesse, Melkie Getnet
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Mengistie, Desalegn Alemu
    Chalmers University of Technology.
    Chen, Yan
    Soochow University.
    Wang, Lichuan
    Soochow University.
    Loghin, Carmen
    GA Technical University of Iasi.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Electrically Conductive Highly Elastic Polyamide/Lycra Fabric Treated with PEDOT:PSS and Polyurethane2019In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 54, no 13, p. 9591-9602Article in journal (Refereed)
    Abstract [en]

    Conductive elastic fabrics are desirable in wearable electronics and related applications. Highly elastic conductive polyamide/lycra knitted fabric was prepared using intrinsically conductive polymer poly (3, 4-ethylenedioxythiophene) (PEDOT) blended with polyelectrolyte poly (styrene sulfonate) (PSS) using easily scalable coating and immersion methods. The effects of these two methods of treatments on uniformity, electromechanical property, stretchability, and durability were investigated. Different grades of waterborne polyurethanes (PU) were employed in different concentrations to improve the coating and adhesion of the PEDOT:PSS on the fabric. The immersion method gave better uniform treatment, high conductivity, and durability against stretching and cyclic tension than the coating process. The surface resistance increased from ~1.7 and ~6.4 Ω/square at 0% PU to ~3.7 and ~12.6 Ω/square at 50% PU for immersion and coating methods, respectively. The treatment methods as well as the acidic PEDOT:PSS did not affect the mechanical properties of the fabric and the fabric show high strain at break of ~650% and remain conductive until break. Finally, to assess the practical applicability of the treated fabric for wearable e-textiles, the change in surface resistance was assessed by cyclically stretching 10 times at 100% strain and washing in a domestic laundry for 10 cycles. The resistance increases only by a small amount when samples were stretched cyclically at 100% strain and the samples show good durability against washing.

  • 3.
    Tadesse, Melkie Getnet
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Desalegn Alemu, Mengistie
    Chalmers University of Technology.
    Müller, Christian
    Chalmers University of Technology.
    Loghin, Maria Carmen
    Gheorghe Asachi Technical University of Iasi.
    Chen, Yan
    Soochow University.
    Wang, Lichuan
    Electromechanical properties of polyamide/lycra fabric treated with PEDOT:PSS2017In: Electromechanical properties of polyamide/lycra fabric treated with PEDOT:PSS, Institute of Physics (IOP), 2017, Vol. 254, p. 072025-Conference paper (Refereed)
    Abstract [en]

    One of the challenges in smart textiles is to develop suitable multifunctional materials that can address simultaneously several characteristics such as durability, stretchability, lightweight, and conductivity. Conductive polymers which showed success in different technological fields like polymer solar cells and light emitting diodes are promising in many smart textile applications. In this work, we treated a common polyamide/lycra knitted fabric with PEDOT:PSS for stretchable e-textiles. PEDOT:PSS, with DMSO as a conductivity enhancer and different ratios of water-based polyurethane dispersions as a binder, was applied to the fabric with simple immersion and coating applications. The effect of different application methods and binder ratio on the surface resistance of the fabric was monitored with four point probe electrical surface resistance measurement systems. Samples prepared by immersion technique are more uniform and have higher conductivity than those prepared by a coating technique. SEM images showed that PEDOT:PSS is incorporated into the structure in the immersion method while in the coating it is majorly present on the surface of the fabric. The tensile measurement showed that the acidic PEDOT:PSS and polyurethane dispersion coating has no adverse effect on the tensile strength of the fabric. The coated samples can be stretched up to 700% while still reasonably conductive. The resistance increases only by a small amount when samples were stretched cyclically by stretching 100%. Generally, samples prepared by the immersion method maintained better conductivity while stretching than those by a coating method. The washing fastness of the samples was also assessed.

  • 4.
    Tadesse, Melkie Getnet
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. Gheorghe Asachi Technical University of IASI.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Dumitrescu, Delia
    University of Borås, Faculty of Textiles, Engineering and Business.
    Loghin, Carmen
    Gheorghe Asachi Technical University of IASI,Romania.
    Chen, Yan
    Soochow University, China.
    Wang, Lichuan
    Soochow University, China.
    3D Printing of NinjaFlex Filament onto PEDOT:PSS-CoatedTextile Fabrics for Electroluminescence Applications2017In: Journal of Electronic Materials, ISSN 0361-5235, E-ISSN 1543-186X, Vol. 47, no 3, p. 2082-2092, article id 6015-6Article in journal (Refereed)
    Abstract [en]

    Electroluminescence (EL) is the property of a semiconductor material pertaining to emitting light in response to an electrical current or a strong electric field. The purpose of this paper is to develop a flexible and lightweight EL device. Thermogravimetric analysis (TGA) measurement was taken to observe the thermal degradation behavior of NinjaFlex. Poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonic acid) (PEDOT:PSS) with ethylene glycol (EG) was coated onto polyester fabric where NinjaFlex was placed onto the coated fabric using three-dimensional (3D) printing and phosphor paste and BendLay filament were coated 3D-printed subsequently. Adhesion strength and flexibility of the 3D-printed NinjaFlex on textile fabrics were investigated. The TGA results of the NinjaFlex depicts that no weight loss was observed up to 150°C. Highly conductive with a surface resistance value of 8.5 ohms/sq., and uniform surface appearance of coated fabric were obtained as measured and observed by using four-probe and scanning electron microscopy (SEM), respectively at 60% PEDOT:PSS. The results of the adhesion test showed that peel strengths of 4160, 3840 N/m were recorded for polyester and cotton specimens, respectively. No weight loss was recorded following three washing cycles of NinjaFlex. The bending lengths were increased by only a factor of 0.082 and 0.577 for polyester and cotton samples at 0.1 mm thickness, respectively; which remains sufficiently flexible to be integrated into textiles. The prototype device emitted light with a 12 V alternating current (AC) power supply. 

  • 5.
    Tadesse, Melkie Getnet
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Loghin, Carmen
    GA Technical University of Iasi.
    Nagy, Ladislav
    Technical University of Liberec.
    Wang, Lichuan
    Soochow University.
    Chen, Yan
    Soochow University.
    Low-Stress Mechanical Property Study of VariousFunctional Fabrics for Tactile Property Evaluation2018In: Materials, ISSN 1996-1944, Vol. 11, no 2466Article in journal (Refereed)
    Abstract [en]

    Functional finishing brings an alteration on the mechanical and surface properties of textilematerials and henceforth influences the tactile properties. In this work, Kawabata evaluation systems(KES) for fabrics were utilized to notice the changes in the tactile properties of fabrics resultingfrom different finishing types such as inkjet printing, screen printing, and coating. The effects offunctional finishing on the fabric’s tactile property were inconsistent with reference to the courseof decrease or increase being dependent on the types of finishes. The findings showed that KEScan be employed as a promising tool to sort out the suitable functional finishing types in termsof tactile properties. Amongst the implemented finishing types, inkjet printing offered superiortactile properties with respect to tensile energy (softness), shear rigidity, compressional softness,bending stiffness (drapability), and surface properties. The KES results confirmed that low-stressmechanical properties are strongly associated with the tactile property and might assist as a qualityprofile data source for guaranteeing the production and development of a virtuous quality product.The result encourages further utilization of the KES for functional fabric tactile property evaluation.

  • 6.
    Tadesse, Melkie Getnet
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Loghin, Maria Carmen
    Gheorghe Asachi Technical University of IASI.
    Harpa, Rodica
    Gheorghe Asachi Technical University of IASI.
    Chen, Yan
    Soochow University.
    Wang, Lichuan
    Soochow University.
    SUBJECTIVE EVALUATION OF FUNCTIONAL TEXTILE FABRICS2017Conference paper (Refereed)
    Abstract [en]

    Research in functional and smart textiles often focuses on technological and scientific challenges, or on the interaction with the wearer in a technological sense, but smaller extent on the interaction of these fabrics with the wearer in terms of tactile sensations. This research focuses on the subjective evaluation of the smart and functional textile fabrics as well as the objective evaluation using Kawabata Evaluation System (KES). A collection of the smart and functional textiles was developed and collected using various state of the art technologies such as 3D printing, inkjet printing, screen printing, and incorporation of smart fibers with knitting. The contact mechanics of these fabrics will be evaluated by subjective hand evaluation to study smart and functional textile fabric sensory properties such smoothness, roughness, softness, prickliness, stretchability, fluffy, sticky, sliding, and other behaviors of the smart fabric when touched with parts of the human finger. Equations will be developed to relate the subjective and objective measurements of the smart textile fabrics. The subjective hand values will be compared further with mechanical properties of the smart fabric such as tensile, bending, shear, compression, and surface friction which will be measured using KES.

1 - 6 of 6
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