Influence of additive contents on the properties of SiC ceramic membranes and their performance in oil-water separation

The high processing cost is the key challenge for the economic industrial use of SiC membrane The aim of this research was to fabricate mullite bonded porous SiC ceramic membrane at low temperature from novel combinations of fly ash and alumina (FA) in weight ratio 44.5:55.5 as sintering additives. The influences of FA and pore former content on the porosity, morphology, crystalline phase composition, mechanical performance, permeability properties were investigated. The membrane prepared at 1300°C using 20 wt% FA showed pure water permeability 3690 Lm⁻²h⁻¹bar⁻¹ and exhibited high oil removal efficiency of ∼ 98% from the synthetic oil-water emulsion having oil concentration of 1000 mg/L. The corrosion behaviour of silicon carbide membrane in the strong acid and alkali solution and its mechanism were investigated. The utilization of fly ash successfully reduced the raw material cost and sintering temperature and the use of alumina reduced the amount of oxidation of SiC as well as increased the amount of mullite bond phase which resulted excellent mechanical strength to the final ceramics.     

废弃煤炭井巷抽水储能的全生命周期成本研究

废弃煤炭井巷抽水储能不仅有利于废弃煤炭井巷资源的再利用,而且有利于促进可再生能源电力的消纳,能够推动煤炭资源型地区能源供给系统的转型发展。废弃煤炭井巷抽水储能的全生命周期成本核算是该项技术推广的前提,具有必要性和现实意义。本文参照大柳塔煤矿地下水库的相关数据,建立了废弃煤炭井巷抽水储能的技术参数体系;通过与传统抽水储能电站进行对比,分析废弃煤炭井巷抽水储能的全生命周期经济成本和环境成本;利用敏感性分析,得出各影响因素对平准化发电成本的影响程度。结果显示:①在不考虑施工难度的情况下,同等装机规模的废弃煤炭井巷抽水储能的平准化储能成本低于传统抽水储能电站的平准化储能成本;在考虑施工难度的情况下,若废弃煤炭井巷抽水储能的施工难度系数小于传统抽水储能的1.26倍,则废弃煤炭井巷抽水储能的成本要小于传统抽水储能;②废弃煤炭井巷抽水储能的装机规模小于传统抽水储能时,其平准化储能成本虽然高于传统抽水储能,但低于当地峰谷差价,具有经济可行性;③施工难度是影响废弃煤炭井巷抽水储能成本的关键因素,环境成本对废弃煤炭井巷抽水储能平准化发电成本影响程度最小;④废弃煤炭井巷抽水储能的环境成本较低,在全生命周期发...     

Smart and Multifunctional Fiber-Reinforced Composites of 2D Heterostructure-Based Textiles

Smart and multifunctional fiber reinforced polymer (FRP) composites with energy storage, sensing, and heating capabilities have gained significant interest for automotive, civil, and aerospace applications. However, achieving smart and multifunctional capabilities in an FRP composite while maintaining desired mechanical properties remains challenging. Here, a novel approach for layer-by-layer (LBL) deposition of 2D material (graphene and molybdenum disulfide, MoS₂)-based heterostructure onto glass fiber fabric using a highly scalable manufacturing technique at a remarkable speed of ≈150 m min⁻¹ is reported. This process enables the creation of smart textiles with integrated energy storage, sensing, and heating functionalities. This methodology combines gel-based electrolyte with a vacuum resin infusion technique, resulting in an efficient and stable smart FRP composite with an areal capacitance of up to ≈182 µF cm⁻² at 10 mV s⁻¹. The composite exhibits exceptional cyclic stability, maintaining ≈90% capacitance after 1000 cycles. Moreover, the smart composite demonstrates joule heating, reaching from ≈24 to ≈27 °C within 120 s at 25 V. Additionally, the smart composite displays strain sensitivity by altering electrical resistance with longitudinal strain, enabling structural health monitoring. These findings highlight the potential of smart composites for multifunctional applications and provide an important step toward realizing their actual real-world applications.