Sustainable Materials and Technologies最新文献_第4页

Dispersion-promoted synergistic cationic dye removal through the co-introduction of natural diatomite and bentonite into chitosan-based hydrogel beads 通过将天然硅藻土和膨润土共同引入壳聚糖水凝胶珠，以分散促进阳离子染料的协同去除

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-11-01 DOI: 10.1016/j.susmat.2024.e01166

Kosar Bagheri , Alireza Kaviani , Gholamreza Pircheraghi, Alireza Shahidizadeh

Hydrogel beads have drawn considerable attention in sustainable wastewater treatment because of their low cost, modifiability, and feasibility. Accordingly, chitosan-based hybrid hydrogel beads were fabricated by incorporating naturally available siliceous micro- and nanoparticles, namely diatomite and bentonite, with different mass ratios. Morphology, swelling behavior, mechanical stability, and ultimately, Methylene Blue (MB)-adsorption performance of the hydrogel beads were comprehensively evaluated in terms of filler dispersion and interactions between the fillers and the matrix. Results revealed that while the simultaneous incorporation of inorganic additives inside the chitosan backbone reduced the swelling degree, the mechanical stability was significantly ameliorated when the 1:1 diatomite-bentonite mass ratio was exploited inside the chitosan matrix. That can be attributed to the well-dispersed fillers and enhanced mechanical entanglements, as well as the strengthened physical interactions between diatomite-bentonite and chitosan matrix. When the hybrid filling system was applied, MB removal efficiency increased synergistically by over 246 % compared to bentonite alone and 268 % compared to diatomite alone, even at low MB concentration (10 ppm). The MB adsorption kinetics and isotherm were also studied. The adsorption kinetics of MB were well-fitted for all compositions using the pseudo-second-order model. The isotherm data for optimum beads indicate that the Freundlich isotherm model provided the best fit, suggesting the multilayer adsorption with a non-uniform distribution of adsorption heat. The cost appraisal and recyclability/reusability assessment indicate that the combination of diatomite and bentonite in chitosan-based hydrogel beads offers a sustainable, highly efficient, and cost-effective solution for cationic dye removal applications.

水凝胶珠因其低成本、可改性和可行性而在可持续废水处理方面备受关注。因此，我们在壳聚糖基混合水凝胶珠中加入了天然硅藻土和膨润土等不同质量比的硅微颗粒和纳米颗粒。根据填料的分散性以及填料与基质之间的相互作用，对水凝胶珠的形态、溶胀行为、机械稳定性以及最终的亚甲基蓝（MB）吸附性能进行了全面评估。结果表明，在壳聚糖骨架中同时加入无机添加剂会降低溶胀度，但在壳聚糖基质中采用 1:1 的硅藻土-膨润土质量比时，机械稳定性会明显改善。这归因于填料的良好分散和机械缠结的增强，以及硅藻土-膨润土和壳聚糖基质之间物理相互作用的加强。应用混合填充系统时，即使甲基溴浓度较低（10 ppm），甲基溴去除效率也比单独使用膨润土时协同提高了 246%以上，比单独使用硅藻土时提高了 268%。还研究了甲基溴的吸附动力学和等温线。使用伪二阶模型对所有成分的甲基溴吸附动力学进行了很好的拟合。最佳珠子的等温线数据表明，Freundlich 等温线模型的拟合效果最好，表明多层吸附的吸附热分布不均匀。成本评估和可回收性/可再利用性评估表明，壳聚糖水凝胶珠中硅藻土和膨润土的组合为阳离子染料去除应用提供了一种可持续、高效和经济的解决方案。

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引用次数: 0

Recycling of hydrogen tolerant La0.6Ca0.4Co0.2Fe0.8O3–d oxygen transport membranes with integrated life cycle assessment for plasma-assisted CO2-conversion 通过综合生命周期评估回收耐氢 La0.6Ca0.4Co0.2Fe0.8O3-d 氧传输膜，用于等离子体辅助二氧化碳转化

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-31 DOI: 10.1016/j.susmat.2024.e01161

Aasir Rashid , Hyunjung Lim , Daniel Plaz , Giamper Escobar Cano , Marc Bresser , Katharina-Sophia Wiegers , Vanessa Zeller , Magdalena Ola Cichocka , Moritz Thiem , Sungho Baek , Guoxing Chen , Ute Kolb , Armin Feldhoff , Andreas Schulz , Anke Weidenkaff , Marc Widenmeyer

In this study, a recycling approach was adapted for the hydrogen tolerant La_0.6Ca_0.4Co_0.2Fe_0.8O_3–d (LCCF_6428) oxygen transport membranes that have great potential in plasma-assisted CO₂ conversion techniques for producing industrial fuels such as methanol. The major focus was the incorporation of sustainability measures such as integrating life cycle assessment (LCA) into the materials development at an early stage to study and compare the environmental feasibility of the recycled membrane with the primary membrane. The aim was also to ensure reduced resource depletion of critical raw materials such as cobalt and lanthanum by means of recycling. It consisted of microwave-assisted dissolution of the membrane followed by ultrasonic spray synthesis. The recycled membrane exhibited at least 83 % of the oxygen permeability of the primary membrane and maintained hydrogen tolerance up to 600 °C for 25 h which is a remarkable result for LCCF_6428 in terms of potentially enhancing its life span. As per the LCA, recycling did result in lower resource depletion. However, the recycled LCCF had a higher overall environmental impact compared to the primary LCCF, mainly due to increased electricity consumption during recycling. These results accentuate the need for a transition towards more efficient processes accompanied by cleaner and renewable sources of energy and critically indicate integration of LCA into materials development to establish the sustainability profile of materials.

在这项研究中，对耐氢性 La0.6Ca0.4Co0.2Fe0.8O3-d (LCCF_6428) 氧传输膜采用了回收方法，这种膜在等离子体辅助二氧化碳转换技术中具有巨大潜力，可用于生产甲醇等工业燃料。主要重点是纳入可持续发展措施，如在早期阶段将生命周期评估（LCA）纳入材料开发，以研究和比较再生膜与原生膜在环境方面的可行性。其目的还在于通过回收利用，确保减少钴和镧等关键原材料的资源损耗。它包括微波辅助溶解膜，然后进行超声波喷雾合成。回收膜的透氧率至少是原膜的 83%，并在 600 °C 的温度下保持 25 小时的耐氢性，这对 LCCF_6428 来说是一个显著的结果，有可能延长其使用寿命。根据生命周期评估，回收利用确实降低了资源损耗。不过，与原生 LCCF 相比，回收的 LCCF 对环境的总体影响更大，这主要是由于在回收过程中增加了耗电量。这些结果表明，有必要向更高效的工艺过渡，同时使用更清洁的可再生能源，这也是将生命周期评估纳入材料开发以确定材料可持续性概况的关键所在。

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引用次数: 0

Highly efficient magnesium ferrite/graphene nano-heterostructure for visible-light photocatalytic applications: Experimental and first-principles DFT studies 用于可见光光催化应用的高效镁铁氧体/石墨烯纳米异质结构：实验和第一原理 DFT 研究

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-29 DOI: 10.1016/j.susmat.2024.e01159

Hossein Maleki-Ghaleh , Ehsan Moradpur-Tari , Mohammad Shakiba , Ehsan Ghasali , Ziba Dargahi , Danial Norouzi Arator , Yashar Behnamian , Ali Fallah , Ali Zarrabi , Ermia Aghaie , Pariya Yardani Sefidi , Mir Ghasem Hosseini , Ali Akbari-Fakhrabadi , Hamid Omidvar , M. Hossein Siadati

In this research study, the electronic structure of magnesium ferrite/graphene (MFO/Gr) nano-heterostructure for photocatalytic application was studied. The MFO nanoparticles with a median size of 85 nm were composited with Gr sheets using a photo-assisted reduction process. The XRD and SAED results, respectively, showed the spinal crystalline structure of MFO and the hexagonal structure of Gr in MFO/Gr nanocomposite. The XPS results revealed that the orbitals of MFO and Gr atoms interacted with each other, implying a Van der Waals heterojunction nanocomposite. The optical characteristics using UV–Vis diffuse reflectance spectrophotometry (UV–Vis DRS) and photoluminescence (PL) spectra demonstrated a lowering of MFO band gap from 2.05 to 1.84 eV by incorporation of Gr. Furthermore, the photoelectrocatalytic and photocatalytic dye degradation examinations showed a substantial impact of Gr on the photocatalytic activity of MFO nanoparticles: a 28-fold increase in the photocurrent and an 8-fold increase in the dye-degradation rate. The density functional theory (DFT) studies on MFO/Gr heterojunction revealed a considerable hybridization between Gr atoms orbitals (2p orbitals) and MFO atoms orbitals (Mg 3 s and Fe 3d orbitals) in the conduction band, which facilitate the transfer of photo-excited electrons from MFO to Gr. Also, the charge density difference at the MFO/Gr interface led to a polarized field at the interface, which is desirable for hindering photogenerated electron-hole recombination in the MFO/Gr nanocomposite. Along with the experimental results, the DFT results also revealed that the MFO/Gr nano-heterostructure is an excellent candidate for photocatalytic applications such as water splitting using sunlight to produce green hydrogen fuel.

本研究对用于光催化应用的镁铁氧体/石墨烯（MFO/Gr）纳米异质结构的电子结构进行了研究。采用光助还原工艺将中值尺寸为 85 nm 的 MFO 纳米颗粒与 Gr 片复合在一起。XRD 和 SAED 结果分别表明，在 MFO/Gr 纳米复合材料中，MFO 为脊晶结构，Gr 为六方结构。XPS 结果表明，MFO 和 Gr 原子的轨道相互影响，这意味着这是一种范德华异质结纳米复合材料。利用紫外-可见漫反射分光光度法（UV-Vis DRS）和光致发光（PL）光谱测定的光学特性表明，加入 Gr 后，MFO 的带隙从 2.05 eV 降至 1.84 eV。此外，光电催化和光催化染料降解试验表明，Gr 对 MFO 纳米粒子的光催化活性有很大影响：光电流增加了 28 倍，染料降解率增加了 8 倍。对 MFO/Gr 异质结的密度泛函理论（DFT）研究表明，导带中的 Gr 原子轨道（2p 轨道）与 MFO 原子轨道（Mg 3 s 和 Fe 3d 轨道）之间存在相当程度的杂化，这有利于光激发电子从 MFO 转移到 Gr。此外，MFO/Gr 界面上的电荷密度差导致了界面上的极化场，这对于阻碍 MFO/Gr 纳米复合材料中光生电子-空穴重组是非常理想的。除实验结果外，DFT 结果还表明，MFO/Gr 纳米异质结构是光催化应用的理想候选材料，例如利用太阳光进行水分离以生产绿色氢燃料。

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引用次数: 0

One-step synthesis of carbon-onion-supported PtCo alloy by underwater arc discharge for pH-universal hydrogen evolution reaction 利用水下电弧放电一步合成碳离子支撑的铂钴合金，用于 pH 值通用氢进化反应

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-29 DOI: 10.1016/j.susmat.2024.e01160

Bin Zhang , Dechuan Peng , Bing Hao , Yongqing Shen , Manyuan Gan , Yanhui Song , Haixia Zhang , Peizhi Liu , Bingshe Xu , Junjie Guo

Exploring low-cost and highly efficient electrocatalysts for pH-universal hydrogen evolution reaction (HER) is critical for the development of hydrogen energy conversion but challenging. In this study a novel catalyst of well-dispersed PtCo alloy nanoparticles with a size of ∼2 nm anchored on carbon nano onions (CNOs) has been constructed by a one-step underwater arc discharge method. The optimized Pt_0.91Co_0.09@CNOs catalyst with a Pt loading of 17.5 wt% and Co loading of 0.54 wt% exhibits excellent HER performances with overpotentials of 24 mV, 15 mV and 39 mV at the current density of 10 mA cm⁻², and 137 mV, 108 mV and 63 mV at 100 mA cm⁻² in alkaline, neutral, and acidic electrolytes, respectively, as well as superior continuous stability. Density functional theory calculations indicate the formation of PtCo nano alloy is beneficial for the modulation of the electron structure of catalysts, and thus presents a moderate H* adsorption energy and d-band center. This work provides a simple and economical strategy on constructing efficient alloy catalysts for pH-universal HER and offers an opportunity for the real-world application of hydrogen energy conversions.

探索低成本、高效的 pH 值通用氢进化反应（HER）电催化剂对于氢能转换的发展至关重要，但也极具挑战性。本研究采用一步水下电弧放电法，构建了一种新型催化剂，该催化剂由锚定在碳纳米管（CNOs）上的分散良好的铂钴合金纳米颗粒（尺寸为 2 纳米）组成。优化后的 Pt0.91Co0.09@CNOs 催化剂的铂负载量为 17.5 wt%，钴负载量为 0.54 wt%，在碱性、中性和酸性电解质中，电流密度为 10 mA cm-2 时的过电位分别为 24 mV、15 mV 和 39 mV，电流密度为 100 mA cm-2 时的过电位分别为 137 mV、108 mV 和 63 mV，并且具有优异的连续稳定性。密度泛函理论计算表明，铂钴纳米合金的形成有利于调节催化剂的电子结构，从而呈现出适度的 H* 吸附能和 d 带中心。这项工作为构建 pH 值通用的高效合金催化剂提供了一种简单而经济的策略，并为氢能转换的实际应用提供了机会。

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引用次数: 0

Optimizing nanocasting techniques for stable bismuth-mesoporous silica composites in thermal energy storage application 优化纳米铸造技术，实现稳定的铋-多孔二氧化硅复合材料在热能储存中的应用

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-28 DOI: 10.1016/j.susmat.2024.e01157

Daniel Lincu , Simona Ioniță , Mihaela Deaconu , Florica Papa , Bogdan Trică , Cristian Matei , Daniela Berger , Raul-Augustin Mitran

Economically storing solar energy for use throughout the night is a major challenge facing the widespread transitions towards green energy generation and combating global warming. While most efforts are focused on electrochemical batteries, storing solar energy as heat is a viable alternative. Phase change materials (PCMs) utilize the solid – liquid transition to reversibly store heat at a constant temperature. The leakage of the molten phase limits the use of PCMs, but it can be alleviated by impregnation into porous matrices. Metals can be used for high temperature stationary heat storage, but are incompatible with oxide matrices due to the large difference in density and surface tension. The optimization of mesoporous silica – bismuth composites synthesis through nanocasting followed by reduction is reported. The resulting materials exhibit metallic bismuth both inside the mesopores and as an interparticle phase, leading to materials with stability towards oxidation, reversible heat storage, shape stability and reliability. A nanoconfined Bi phase could be obtained for low reaction times (4 h) and temperatures (125 °C) and it is correlated with increased stability towards oxidation in air. The samples with 50 % wt. metal retain their macroscopic shape above the metal melting point without leakage. All composites retain 50–96 % of their theoretical heat of fusion, which remains unchanged after 50 heating – cooling cycles. Nanocasting metal salts under hydrophobic solvents is a promising route for obtaining nanocomposites for thermal energy storage with both nanoconfined and interparticle metal phases.

以经济的方式储存太阳能以供整夜使用，是向绿色能源发电和应对全球变暖的广泛转型所面临的一项重大挑战。虽然大多数努力都集中在电化学电池上，但将太阳能储存为热能是一种可行的替代方法。相变材料（PCMs）利用固-液转变在恒温条件下可逆地储存热量。熔融相的泄漏限制了 PCM 的使用，但通过浸渍到多孔基质中可以缓解这一问题。金属可用于高温静态储热，但由于密度和表面张力相差很大，因此与氧化物基质不兼容。本报告介绍了通过纳米铸造和还原合成介孔二氧化硅-铋复合材料的优化方法。所得到的材料在介孔内部和作为粒子间相都显示出金属铋，从而使材料具有氧化稳定性、可逆蓄热性、形状稳定性和可靠性。在较短的反应时间（4 小时）和较低的温度（125 °C）下就能获得纳米约束铋相，而且这种铋相在空气中的氧化稳定性也有所提高。含有 50% 重量级金属的样品在金属熔点以上仍能保持宏观形状，不会发生泄漏。所有复合材料都保留了 50-96% 的理论熔融热，在 50 次加热-冷却循环后保持不变。在疏水性溶剂下对金属盐进行纳米铸造，是获得具有纳米约束金属相和颗粒间金属相的热能存储纳米复合材料的可行途径。

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引用次数: 0

Controlled synthesis of NiSe2-NiMoO4-MoO3 material on nickel foam as an efficient hydrogen evolution reaction catalyst in seawater and urea electrolytes 在泡沫镍上可控合成 NiSe2-NiMoO4-MoO3 材料，作为海水和尿素电解质中的高效氢进化反应催化剂

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-28 DOI: 10.1016/j.susmat.2024.e01158

Hui Wang , Xiaoqiang Du , Xiaoshuang Zhang

Hydrogen energy is considered as a new clean energy to replace traditional fossil energy. How to achieve large-scale industrial production has always been a problem that we are committed to studying. Hydrogen generation by electrolysis of water is considered to be one of the most effective hydrogen production approaches at present. However, with the global shortage of fresh water resources, we urgently need to prepare an efficient and low-cost seawater splitting catalyst. In this paper, the heterogeneous NiSe₂-NiMoO₄-MoO₃ material was successfully synthesized on foamed nickel substrate through hydrothermal and calcination approaches. And it showed excellent hydrogen evolution reaction (HER) performance, in 1 M KOH + seawater solution, the current density of 10 mA cm⁻² can be obtained with only overpotential of 105 mV. In 0.5 M urea+1 M KOH solution, a mere overpotential of 87 mV is required to drive a current density of 10 mA cm⁻². In the stability test of 15 h, the activity of the catalyst material remained stable after a short decline, showing acceptable stability performance. Density functional theory (DFT) calculations proved that NiMoO₄ plays a major role in the reaction and their synergistic catalysis results in better catalytic activity and stability. This study proposes a novel understanding for the preparation of HER catalyst with low cost and high efficiency.

氢能被认为是替代传统化石能源的新型清洁能源。如何实现大规模工业化生产一直是我们致力于研究的问题。电解水制氢被认为是目前最有效的制氢方法之一。然而，随着全球淡水资源的短缺，我们迫切需要制备一种高效、低成本的海水裂解催化剂。本文通过水热法和煅烧法，在发泡镍基底上成功合成了异质 NiSe2-NiMoO4-MoO3 材料。在 1 M KOH + 海水溶液中，只需 105 mV 的过电位就能获得 10 mA cm-2 的电流密度。在 0.5 M 尿素 +1 M KOH 溶液中，只需要 87 mV 的过电位就能驱动 10 mA cm-2 的电流密度。在 15 小时的稳定性测试中，催化剂材料的活性在短暂下降后保持稳定，显示了可接受的稳定性能。密度泛函理论（DFT）计算证明，NiMoO4 在反应中发挥了重要作用，二者的协同催化作用可获得更好的催化活性和稳定性。这项研究为制备低成本、高效率的 HER 催化剂提出了一种新的认识。

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引用次数: 0

Recent advances in luminescent metal-organic frameworks (L-MOFs) as sustainable materials for sensing of potentially toxic environmental ubiquitous explosive contaminants 将发光金属有机框架（L-MOFs）作为可持续材料用于传感具有潜在毒性的环境隐爆污染物的最新进展

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-24 DOI: 10.1016/j.susmat.2024.e01155

Muhammad Asad , Muhammad Imran Anwar , Baoji Miao , Ansar Abbas , Saadat Majeed , Irshad Ahmad Mir , Muhammad Saqib Rabbani , Sameer Hussain , Sankui Xu , Mohammed A. Al-Tahan , Chuxiao Shao , Shuanghu Wang , Ayesha Younas

Although, the explosive materials are crucial for homeland safety and defense systems, they impose severe side effects on the environment and human health. The residues or byproducts of these hazardous materials can contaminate the environment and implies acute chronic effects on humans as well as animals. Hence, the ultrasensitive, low cost and convenient detection of widely used explosive compounds is highly desirable considering environmental pollution and increasing human health issues. Owing to their numerous features, luminescent metal-organic frameworks (L-MOFs) have gained much attention during the past few decades in the field of sensing with focus on national security, environmental monitoring, and forensic science. In this review, we have systematically described the detection of six kinds of widely used hazardous explosive compounds (nitroaromatics, nitramines, nitroalkanes, nitrate esters, peroxides and acid salts) using luminescent MOFs as the primary sensing material. The origin of fluorescence in MOFs, factors affecting the fluorescence, synthetic methods as well as various sensing mechanisms involved during the detection are discussed. Besides, most of the MOF based fluorescent probes reported in past decade for the detection of various explosive chemicals through diverse coordination interactions are summarized in tabular forms. Finally, the existing challenges and future prospects in the relevant research area are also discussed.

尽管爆炸材料对国土安全和防御系统至关重要，但它们也对环境和人类健康造成了严重的副作用。这些危险材料的残留物或副产品会污染环境，并对人类和动物造成急性慢性影响。因此，考虑到环境污染和日益严重的人类健康问题，对广泛使用的爆炸性化合物进行超灵敏、低成本和便捷的检测是非常必要的。过去几十年来，发光金属有机框架（L-MOFs）凭借其众多特性，在以国家安全、环境监测和法医学为重点的传感领域备受关注。在这篇综述中，我们系统地介绍了以发光 MOFs 为主要传感材料检测六种广泛使用的危险爆炸性化合物（硝基芳烃、硝胺、硝基烷烃、硝酸酯、过氧化物和酸盐）的方法。本文讨论了 MOFs 荧光的起源、影响荧光的因素、合成方法以及检测过程中涉及的各种传感机制。此外，还以表格形式总结了过去十年中报道的大多数基于 MOF 的荧光探针，这些探针通过不同的配位相互作用来检测各种爆炸性化学物质。最后，还讨论了相关研究领域的现有挑战和未来前景。

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引用次数: 0

Open-structured silica network based on silane-terminated telechelic polybutadiene for electric vehicle tires 基于硅烷端聚丁二烯的开放结构二氧化硅网络，用于电动汽车轮胎

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-24 DOI: 10.1016/j.susmat.2024.e01156

Kiwon Lim , Seung Jae Hong , Hyungjae Lee , Jaehyun Jung , Kihyun Kim , Jong Hyuk Park , Joona Bang

The shift towards electric vehicles (EVs) is essential for a sustainable future. Tire manufacturers face challenges including accommodating extra weight, managing instant torque, reducing noise, and improving driving range. Meeting these demands involves substantially reducing the rolling resistance of tire tread composites while simultaneously enhancing their mechanical stiffness and wear resistance. To overcome these issues, an open-structured silica network based on silane-terminated liquid-like telechelic polybutadienes was introduced into rubber composites. This unique network consists of silica aggregates that are chemically bound together, but exhibit physical separation, enabling rubber chains to permeate. The infiltrated polymer chains were tightly constrained by the network, resulting in a notable increase in the crosslink density and mechanical strength of the composite. Furthermore, the tan δ values at 60 °C showed a notable decrease as a result of diminished interparticle friction caused by isolated silica structures and reduced mobility of polymer chains within the network. These findings provide the tire industry with crucial insights for the development of energy-efficient and durable tires for EVs. By addressing these specific requirements of EVs, our study paves the way for more sustainable tires and contributes to the broader adoption of EVs in a sustainable future.

向电动汽车（EV）的转变对于可持续发展的未来至关重要。轮胎制造商面临的挑战包括承受额外重量、控制瞬间扭矩、降低噪音以及提高行驶里程。要满足这些要求，就必须大幅降低轮胎胎面复合材料的滚动阻力，同时增强其机械刚度和耐磨性。为了解决这些问题，我们在橡胶复合材料中引入了一种基于硅烷封端液态类远志聚丁二烯的开放结构二氧化硅网络。这种独特的网络由化学结合在一起的二氧化硅聚集体组成，但表现出物理分离，使橡胶链得以渗透。渗入的聚合物链受到网络的紧密约束，从而显著提高了复合材料的交联密度和机械强度。此外，由于孤立的二氧化硅结构减小了颗粒间的摩擦力，并降低了聚合物链在网络中的流动性，60 °C 时的 tan δ 值明显下降。这些发现为轮胎行业开发节能耐用的电动车轮胎提供了重要启示。通过解决电动汽车的这些特殊要求，我们的研究为开发更具可持续性的轮胎铺平了道路，并有助于在可持续发展的未来更广泛地采用电动汽车。

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引用次数: 0

Development of sustainable aluminum alloy‑tungsten carbide hybrid composites using industrial waste - An experimental analysis 利用工业废料开发可持续铝合金-碳化钨混合复合材料--实验分析

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-21 DOI: 10.1016/j.susmat.2024.e01144

Ramasamy N. , Prakash M. , Prabhu B. , Viswanathan K. , Gowtham A. , Magesh R. , Arunkumar T.

The research article focuses on the development of aluminum alloy 6061 sustainable composites with the utilization of industrial waste through the use of the stir casting process. Recycling industrial waste is essential for reducing environmental impact. Thus, the red mud waste came from the aluminum production process, which was considered for producing sustainable metal matrix composites (MMCs). Also, tungsten carbide (WC) microparticles have been used to develop hybrid aluminum composite materials. The concentrations of red mud and tungsten carbide were 2 wt%, 4 wt%, and 6 wt%, respectively, and were used to achieve the desired strength performance of aluminum metal matrix composites. The elemental and bonding analyses of hybrid composites were analyzed using X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) analysis. Mechanical characterizations of aluminum hybrid sustainable composites were also investigated, including tensile, compression, and microhardness testing. The results show that increasing reinforcement by up to 4 wt% increases the mechanical strength of aluminum alloy composites. The tensile, compression, and microhardness of metal matrix composites are increased by 25.24 %, 40.2 %, and 20.6 %, respectively, as compared to the aluminum alloy 6061 alloy. The surface morphology of metal matrix composites was analyzed by utilizing Field emission scanning electron microscopy. The proposed sustainable aluminum composites have the potential to develop structural and automotive components due to their higher strength-to-weight ratio.

研究文章的重点是通过使用搅拌铸造工艺，利用工业废料开发铝合金 6061 可持续复合材料。回收利用工业废物对减少环境影响至关重要。因此，我们考虑利用铝生产过程中产生的赤泥废料来生产可持续金属基复合材料（MMC）。此外，碳化钨（WC）微粒也被用于开发混合铝复合材料。赤泥和碳化钨的浓度分别为 2 wt%、4 wt% 和 6 wt%，用于实现铝金属基复合材料所需的强度性能。利用 X 射线衍射（XRD）和傅立叶变换红外光谱（FTIR）分析了混合复合材料的元素和结合分析。此外，还研究了铝混合可持续复合材料的力学特性，包括拉伸、压缩和微硬度测试。结果表明，增加 4 wt% 的增强量可提高铝合金复合材料的机械强度。与铝合金 6061 相比，金属基复合材料的拉伸强度、压缩强度和显微硬度分别提高了 25.24%、40.2% 和 20.6%。利用场发射扫描电子显微镜分析了金属基复合材料的表面形态。所提出的可持续铝复合材料具有更高的强度重量比，因此具有开发结构和汽车部件的潜力。

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引用次数: 0

Micro-extrusion foaming fabricating porous polyester elastomeric fiber for using in radiative cooling fabrics 微挤压发泡制造多孔聚酯弹性纤维，用于辐射冷却织物

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies

Pub Date : 2024-10-19 DOI: 10.1016/j.susmat.2024.e01151

Zelin Wang , Yushu Wang , Bichi Chen, Hanyi Huang, Yaozong Li, Wentao Zhai

Climate change has unleashed relentless global heatwaves, posing grave threats to the physical and mental well-being of outdoor laborers and the smooth functioning of society. Porous polymeric fibers exhibit promising potential in personal thermal management for wearable fabrics. Nevertheless, the absence of an environmentally friendly, cost-effective, and efficient method for producing the desired porous fibers remains a formidable challenge. Here, we introduce a pioneering micro-extrusion foaming technique for crafting elastic porous fibers endowed with dense longitudinally oriented cell morphologies, remarkable porosity of 69 % and elongation of 668 %. The technique enabled the continuous production of porous fibers exceeding 3000 m in length in a single operation, with fiber diameters controlled to approximately 0.25–0.55 mm. Fabrics woven from the elastic porous fiber offered a soft touch, proficiently reflecting more than 90.0 % of incident solar radiation and emitting 91.9 % of absorbed heat radiation, thereby achieving a theoretical radiant cooling power of 111.46 W/m² on sunlit days. Leveraging the controllable and scalable attributes of micro-extrusion foaming, the porous fiber is primed for practical deployment and expansion into diverse wearable applications.

气候变化引发了无情的全球热浪，严重威胁着户外劳动者的身心健康和社会的正常运转。多孔聚合物纤维在可穿戴织物的个人热管理方面展现出巨大的潜力。然而，缺乏一种环保、经济、高效的方法来生产所需的多孔纤维仍然是一项艰巨的挑战。在此，我们介绍了一种开创性的微挤压发泡技术，用于制造具有致密纵向定向细胞形态的弹性多孔纤维，其孔隙率高达 69%，伸长率高达 668%。该技术可一次性连续生产长度超过 3000 米的多孔纤维，纤维直径控制在 0.25-0.55 毫米左右。用弹性多孔纤维织成的织物具有柔软的触感，能有效反射 90.0% 以上的入射太阳辐射，并释放 91.9% 的吸收热辐射，从而在晴天达到 111.46 W/m2 的理论辐射制冷功率。利用微挤压发泡的可控性和可扩展性，多孔纤维已准备就绪，可实际部署并扩展到各种可穿戴应用中。

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引用次数: 0