•A review of bio-based composite is presented.•Focus on the utilisation of natural textile material in composite is given.•Overview on issues in composite fabrication using textile materials is ...emphasized.•Advantages, limitations and suggestions for future development are summarised.
This paper gives an overview of utilising natural textile materials as reinforcements for engineering composites applications. The definition and types of textile materials are addressed to provide readers a thoughtful view on the role of these materials in a structural composite system. Available material properties of natural textile and their composites are critically reviewed here. In general, these materials are categorised into fibre, yarn and fabric forms. The load bearing capacity of natural textile fibre reinforced polymer composites is governed by the quantity, alignment and dispersion properties of fibres. It has been found that the natural fibre reinforced composites are limited to use in low to medium load bearing applications. However, a limited research work has been performed to date and there is a significant gap between the high performance textile fabric and their use as reinforcement in fibre reinforced composite materials.
Although substrate integrated waveguide (SIW) technology is well established for the fabrication of microwave circuits on rigid printed circuit boards, and the first implementations of textile SIW ...antennas have recently appeared in literature, up to now, no complete set of SIW microwave components has been presented. Therefore, this paper describes the design, manufacturing, and testing of a new class of textile microwave components for wearable applications, implemented in SIW technology. After characterizing the adopted textile fabrics material in terms of electrical properties, it is shown that folded textile SIW components, such as interconnections, filters, and antennas form excellent building blocks for wearable microwave circuits, given their low profile, flexibility, and stable characteristics under bending and in proximity of the human body. Hence, they allow the full exploitation of the large area garments offered for the deployment of wearable electronics. Besides SIW interconnections, a folded textile SIW filter operating at 2.45 GHz is designed and tested. The filter combines excellent performance in the band of interest with good out-of-band rejection, even when accounting for the tolerances in the fabrication process. Finally, a folded SIW cavity-backed patch antenna is fabricated and experimentally verified in realistic operating conditions.
Studies have been conducted on the process of obtaining brass nanoparticles by means of reduction with environmentally friendly preparations in order to give biocidal properties to non-woven fabric. ...The aim of the study is to modify a non-woven material using silver nanoparticles to give it biocidal properties. The effective composite preparation developed for biocidal finishing of textile materials is relatively inexpensive, environmentally and toxicologically safe. Its application opens up prospects for manufacturing a wide range of competitive, environmentally friendly, bio-resistant textile materials for various purposes. Process conditions of antibacterial finishing of textile materials were the followings: an aqueous solution with brass nanoparticles was sprayed onto the surface of a non-woven fabric, then dried and heat treated at 180 °C on a thermal press. To study the biocidal activeness of heat-treated material, a microbiological investigation was carried out. Non-woven fabric processed on the basis of brass nanoparticles obtains pronounced antifungal activeness in terms of investigating C.albicansATCC 2091 and C.albicansATCC 10231 test strains. Also, experiments on toxic and skin-irritating effects of non-woven material processed by the proposed method showed its safety for human health. The developed product based on silver nanoparticles provides high indicators of bio-resistance of textile material and meets the environmental requirements for textile auxiliary substances. In the production of nonwovens, processing with this composition can be combined with the emulsification of a mixture of fibers, or carried out after the formation of the canvas with subsequent heat treatment and calendering.
THE EVALUATION OF NOVEL WOUND DRESSINGS BASED ON HYDROGELS RADULESCU Diana-Elena; RADULESCU Denisa-Maria; CHIRILA Laura ...
Annals of the University of Oradea: Fascicle of Textiles, Leatherwork,
05/2020, Volume:
21, Issue:
1
Journal Article
Open access
Wound dressings gained a significant importance in the development of ideal solutions regarding wound healing therapy. The necessity of novel wound dressings in the clinical flied increased over the ...years due to the constant occurrence of burns or anti-inflammatory lesions. Skin injuries can compromise the integrity and protective function of the cutaneous tissue, resulting in infections. In this regard, numerous studies have been performed to improve the healing process without scarring, by developing suitable wound dressings based on hydrogels. Hydrogel dressings are an essential component in different categories of wound care strategies. The aim of this study was to develop an ideal hydrogel dressing based on carboxymethyl cellulose/pectin/gelatin in order to provide an ideal environment for both cleaning and protecting the wound, but also to offer a suitable permeability to the wound bed. The addition of Common Comfrey (Symphytum officinale) extract and Aloe Vera oil has been accomplished to enhance the healing capacity of the developed wound dressings. Further, woven fabric made of 100% cotton fibers was treated with the synthesized hydrogels through padding method using different concentrations of glycerin (10-20%). The resulted hydrogels were characterized from their morphological and rheological point of view to evaluate their stability and integrity. The treated fabrics were investigated to confirm the successful deposition on the textile material and comfort of the resulted specimens.
A comparative study of Quarter-wavelength λ4 stub and ring resonator techniques for the characterization of four (4) different textile materials (Kente-Oke (M1), Sanya (M2), Alaari (M3) and Etu (M4)) ...are presented in this work for the first time. The materials characterized in this work are locally made handwoven textile called “Aso-Oke” in South-west, Nigeria. The simulation and measurement results are presented. The dielectric parameters of materials were found to be 1.68, 1.46, 1.32, 1.51 for M1, M2, M3, and M4 respectively, and corresponding loss tangent of 0.049, 0.061, 0.019, 0.059 using Ring resonator. In the same light, the permittivity of the material M1, M2, M3, and M4 are found to be 1.75, 1.75, 1.5, 1.5 respectively, and corresponding loss tangent of 0.5, 0.6, 0.2, 0.6 using Quarter-wavelength open end Stub resonator. Using the parameters extracted from characterization, the materials are used as the substrate for wearable antenna to validate the measured dielectric properties of the material under test (MUTs). The results of this work show that, stub technique is more accurate than the ring resonator techniques. This is because of the complexity of ring resonator technique which makes it prone to fabrication error compared to the simplicity of the stub resonator technique. However, stub resonator technique can be time consuming due to the manual adjustment of the relative permittivity of the material during simulation. It is observed from the results of this research that, the stub resonator results are comparable to the Ring resonator-based results. Hence, combining the two techniques by using the ring resonator to predict the region of the relative permittivity and then using the stub resonator technique to optimize the accuracy by varying the permittivity around the predicted region provided by ring resonator technique shall reduce the time consumed by Stub-resonator and increases the accuracy of the measurement.
•The T - resonator technique has better accuracy compared to the Ring-resonator technique for material characterization.•Hybridization of T-resonator and Ring-resonator techniques can result in quick and accurate textile material characterization.•The dielectric properties of Kente-Oke, Sanya, Alaari and Etu made in Nigeria are presented for the first time.•Kente-Oke is suitable for compact wearable antenna while Alaari is suitable for high gain/efficiency wearable applications.
The identification of textile fiber materials is a tedious task. Traditional physical or chemical methods rely on specialist knowledge and expensive instruments. Currently, the deep learning-based ...methods are limited by the lack of sufficient image samples. In this paper, we propose a method for the classification of textile materials based on advanced densely connected convolutional networks (Densenet) using fabric surface images. Firstly, we selected a small sample dataset containing five types of materials and performed some pre-processing, including colour weakening and data enhancement. The lightweight network Densenet was then used as the main body to ensure the low parameters of the network, making it more suitable for the recognition of small sample image datasets. The network is then fused with the attention mechanism, Orthogonal Softmax Layer (OSL) and the depth-separable convolution mechanism, and we call the final network AONet. It has only 0.64 M (million) parameters. In this paper, we tested four metrics of AONet for five types of fabric images, and the results showed that the recognition accuracy was 95.61%. The precision, recall and F1 scores were 94.87%, 94.31% and 94.40%, respectively.
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