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SISAL
About: SISAL is a research topic. Over the lifetime, 1878 publications have been published within this topic receiving 55528 citations.
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4 citations
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31 May 2017
TL;DR: In this paper, a method for preparing water-soluble carbon quantum dots from sisal hemp as a raw material is presented, which includes pre-treating the sisal and mixing deionized water and glycerol in a volume ratio of (2-5) to obtain a mixed solution for standby application.
Abstract: The invention discloses a method for preparing water-soluble carbon quantum dots from sisal hemp as a raw material. The method comprises the following steps: 1) pretreating the sisal hemp; 2) mixing deionized water and glycerol in a volume ratio of (2-5): 1 to obtain a mixed solution for standby application; 3) adding the pre-treated sisal hemp to the mixed solution obtained in the step 2), stirring the mixture, and placing the mixture in a microwave environment for microwave processing to obtain a brown solution; 4) filtering the brown solution to obtain a filtrate; 5) dialyzing the filtrate; 6) evaporating a dialysate at constant temperature to obtain the water-soluble carbon quantum dots. The water-soluble carbon quantum dots are prepared with a microwave method directly, the carbon source is rich and cheap, recovery of waste is facilitated, the preparation process is simple, the whole preparation process is non-polluting, non-toxic, green and environment-friendly, and large-scale preparation can be realized.
4 citations
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TL;DR: In this article, a sensor yarn based on a natural sisal yarn containing a non-electro-conductive core impregnated with PVA polymer and coated by PEDOT:PSS polymer as an electroconductive sheath was investigated.
Abstract: In this work, a sensor yarn based on a natural sisal yarn containing a non-electro-conductive core impregnated with PVA polymer and coated by PEDOT:PSS polymer as an electro-conductive sheath was investigated. The main objectives include the development of this new sensor yarn as a first step. Then, we look towards the insertion of this sensor yarn into different woven structures followed by the monitoring of the mechanical behaviour of composite materials made with these fibrous reinforcements. The combined effect of the structural geometry and the number of PEDOT:PSS coating layers on the properties of the sensor yarns was investigated. It was found that the number of PEDOT:PSS coating layers could strongly influence the electromechanical behaviours of the sensor yarns. Different methods of characterization were employed on strain-sensor yarns with two and four coating layers of PEDOT:PSS. The piezo-resistive strain-sensor properties of these selected coating layers were evaluated. Cyclic stretching-releasing tests were also performed to investigate the dynamic strain-sensing behavior. The obtained results indicated that gauge factor values can be extracted in three strain regions for two and four coating layers, respectively. Moreover, these strain-sensor yarns showed accurate and stable sensor responses under cyclic conditions. Furthers works are in progress to investigate the mechanism behind these first results of these sisal fibre-based sensors.
4 citations
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TL;DR: In this paper, reinforced geopolymer pastes with elongated sisal fibers by means of parameters such as flexural strength were studied, and the best value for the modulus of rupture was of approximately 9.3 MPa, obtained with 2 days curing, with the activator/metakaolin ratio of 0.59 and percentage of sisal fiber de 4.34.
Abstract: In the present context, geopolymer appears as an ecologically viable alternative compared to Portland cement, due to lower CO2 emissions rate. The objective of this work is to study reinforced geopolymer pastes with elongated sisal fibers by means of parameters such as flexural strength. For this, metakaolinwas used as an aluminosilicate source material in addition to a combination of sodium silicate and sodium hydroxide as the activator solution. The influence of the independent variables sisal fiber percentage, molar ratio between activator and metakaolin, and the curing t ime was evaluated through an experimental design. The statistical model of central composite planning was used to optimize the results obtained. The best value for the modulus of rupture was of approximately 9.3 MPa, obtained with 2 days curing, with the activator/metakaolin ratio of 0.59 and percentage of sisal fiber de 4.34. Keywords—Mechanical properties, Modulus rupture, Natural fibers, Sisal fibers.
4 citations
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4 citations