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Item type:Publication, Improvement of mechanical properties of hydroxyapatite composites reinforced with i-Al64Cu23Fe13 quasicrystal(SAGE Publishing, 2020-10-15)Mechanical behavior of hydroxyapatite-based composites (HAp) was studied as a function of the reinforcement concentration of the quasicrystalline (QC) Al 64 Cu 23 Fe 13 alloy. The synthesis of the HAp matrix was carried out by sol-gel method, while the synthesis of the QC was performed by an arc furnace with a subsequent thermal treatment. The composites were made by powder metallurgy and cold compacted to form test pieces that were sintered with a constant flow of argon. The materials were characterized using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and Fourier transform Raman spectroscopy. The study of mechanical strength was carried through compression tests. The biocompatibility of the composites was tested using an in-vitro cytotoxicity assay. The mechanical resistance of HAp/QC composites increased with the concentration of quasicrystalline reinforcement. Young’s modulus and compressive strength increased in 43% and 21%, respectively, with a 10 wt% QC reinforcement, which demonstrates an hybrid behaviour of the composite due to the inclusion of reinforcing particles in the pores of the matrix. This composite did not show cytotoxicity at any of the QC concentrations. A fabrication route is proposed as a fast, easy and high efficiency alternative for applications in the biomedical industry because of its high scalability potential. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Physical, thermal and tensile behaviour of 3D printed kenaf/PLA to suggest its usability for ankle–foot orthosis – a preliminary study(Emerald Group Holdings Ltd., 2022-08-02)This paper aims to discuss the physical and thermal properties of the three-dimensional (3D) printing natural composite filament, as well as the tensile behaviour of the printed composites to get an insight of its possibility to be used as an ankle–foot orthosis (AFO) material. Design/methodology/approach: Physical test that was conducted includes scanning electron microscopy analysis, thermogravimetric/differential scanning calorimetry analysis as well as the effect of fibre load after extrusion on the filament morphology. Tensile test was conducted with different amounts of fibre loads (0, 3, 5 and 7 Wt.%) on the printed specimens. Findings: There is an increment of strength as the fibre load is increased to 3 Wt.%; however, it decreases significantly as it is increased to 5 and 7 Wt.% because of the presence of voids. It also shows that the extrusion temperature severely affects the structure of the filaments, which will then affect the strength of the printed composites. Based on the results, it is possible to use kenaf/polylactic acid (PLA) filament to print out AFO as long as the filament production and printing process are being controlled properly. Originality/value: The unique aspect of this paper is the investigation of kenaf/PLA filament as a material for 3D printing, as well as its material consideration for AFO manufacturing. This paper also studies the effect of extrusion temperature on the morphological structure of the filament and its effect on the tensile properties of the printed kenaf/PLA specimen. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance evaluation of Stone Mastic Asphalt (SMA) mixtures with textile waste fibres(Elsevier Ltd, 2024-12-13)The research evaluates the performance of Stone Mastic Asphalt (SMA) mixtures using residual cotton fibres from the Peruvian textile industry to address the environmental pollution caused by this sector. A reference SMA20 mixture was established with 0.30 % commercial fibre and 6 % asphalt. Subsequently, this fibre was replaced by textile fibre in the same proportions. It was found that 0.20 % textile fibre optimally met the volumetric requirements and binder drainage tests. Performance tests showed that the textile fibre achieved a TSR of 95 %, compared to 82 % for the commercial fibre, and a rutting resistance of 2.82 mm compared to 2.46 mm for the commercial fibre. Additionally, the textile fibre demonstrated a better dynamic modulus at high temperatures. In conclusion, residual Peruvian cotton fibres can efficiently replace commercial fibres in SMA20 mixtures, with 0.20 % being the optimal amount, thus promoting sustainable material reuse. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Seamless integration of conducting hydrogels in daily life: From preparation to wearable application(John Wiley and Sons Inc, 2024-04-03)Conductive hydrogels (CHs) have received significant attention for use in wearable devices because they retain their softness and flexibility while maintaining high conductivity. CHs are well suited for applications in skin-contact electronics and biomedical devices owing to their high biocompatibility and conformality. Although highly conductive hydrogels for smart wearable devices are extensively researched, a detailed summary of the outstanding results of CHs is required for a comprehensive understanding. In this review, the recent progress in the preparation and fabrication of CHs is summarized for smart wearable devices. Improvements in the mechanical, electrical, and functional properties of high-performance wearable devices are also discussed. Furthermore, recent examples of innovative and highly functional devices based on CHs that can be seamlessly integrated into daily lives are reviewed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Experimental investigation of seawater exposure and specimen geometry effects on the mechanical performance of 3D-printed ABS and ABS/CF(Springer Science+Business Media, 2026-06-01)In this work, the effects of seawater exposure and specimen geometry on the mechanical performance of 3D-printed Acrylonitrile Butadiene Styrene (ABS) and carbon fiber-reinforced ABS (ABS/CF) were investigated. Enclosed 3D printers were used to avoid shrinkage and warping of ABS and ABS/CF. The standard specimen types in this research work were ASTM D638 type IV, ISO 527-2 type 1BA, and ASTM D3039 full-section specimens. The tensile tests were strain-controlled tests with a strain rate of 0.1 min− 1. Firstly, the effects of the different specimen types on the tensile strength and Young’s modulus of unaged (as-printed) ABS and ABS/CF were analyzed. Secondly, the three types of specimens were immersed in seawater for 1, 2, and 3 weeks to evaluate moisture absorption and the degradation of the mechanical properties. The results indicated that the test specimen type had a statistically significant effect on the mechanical properties of ABS and ABS/CF, with the ISO 527 specimen exhibiting the lowest tensile strength and Young’s modulus. Moreover, all ABS and ABS/CF specimens showed moisture uptake of less than 1%. After three weeks of exposure, the ABS and ABS/CF retained over 90% of their mechanical properties. The good retention of mechanical properties and moisture resistance makes these materials suitable for short-term marine applications.