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Intelligent computing for the double-diffusive peristaltic rheology of magneto couple stress nanomaterials 磁偶应力纳米材料双扩散蠕动流变的智能计算
IF 7.4 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2022-0557
M. Shoaib, F. Ali, M. Awais, Iqra Naz, Robicca Shamim, K. Nisar, M. Raja, M. Y. Malik, Mohamed Abbas, C. Saleel
Abstract In nanofluids, the effect of convection in the presence of double diffusivity on a magneto couple stress fluid with the peristaltic flow of a model in a non-uniform channel (MCSFM) is reviewed in this article. This research discusses MCSF in a non-uniform channel by applying the Levenberg–Marquardt procedure via an artificial backpropagated neural network (LMP-ABNN). For two-dimensional and two-directional flows, mathematical formulations of double-diffusivity convection of a magneto couple stress fluid in nanofluids are developed. The partial differential equations are reduced to ordinary differential equations by using appropriate transformations. The assessment of the Hartmann number, thermophoresis parameter, Dufour parameter, Soret parameter, and magnetic Reynolds number over concentration profiles and temperature profiles is made by generating a dataset for LMP-ABNN based on the ND solve method for different variations of MSCFM. To examine the approximate solution validation, training and testing procedures are interpreted, and the performance is verified through error histogram and mean square error results. The extremely nonlinear equations are reduced by employing a long-wavelength approximation and a low but finite Reynolds number. To describe the behavior of flow quantities, graphical representations of a variety of physical characteristics of importance are shown. The impact of the Hartmann number and magnetic Reynolds number over axial magnetic field and current density is also studied. The concentration increases as the thermophoresis parameter and Dufour parameter values increase. This occurs because the concentration and both these parameters have a direct relationship. We observed opposite behavior for both the magnetic Reynolds number and the Hartman number. The behavior of current density J z increases with increasing values of R m. Both the temperature distribution and solute concentration increase. The final outcome of this study is to provide the potential for these techniques to provide new insights and solutions to challenging problems in nanofluids and other areas of fluid mechanics and to facilitate the design of more efficient and effective microfluidic devices.
摘要在纳米流体中,本文综述了双扩散率条件下对流对磁偶应力流体非均匀通道模型(MCSFM)蠕动流动的影响。本文应用Levenberg-Marquardt过程,通过人工反向传播神经网络(LMP-ABNN)讨论了非均匀信道中的MCSF。对于二维和双向流动,建立了磁偶应力流体在纳米流体中双扩散率对流的数学表达式。通过适当的变换,将偏微分方程化为常微分方程。针对不同变化的MSCFM,基于ND求解方法生成LMP-ABNN数据集,评估了Hartmann数、热涌参数、Dufour参数、Soret参数和磁雷诺数对浓度剖面和温度剖面的影响。为了检验近似解的有效性,解释了训练和测试程序,并通过误差直方图和均方误差结果验证了性能。通过采用长波长近似和低但有限的雷诺数来简化极端非线性方程。为了描述流量的行为,显示了各种重要物理特性的图形表示。研究了哈特曼数和磁雷诺数对轴向磁场和电流密度的影响。随着热泳参数和杜福尔参数的增大,其浓度也随之增大。这是因为浓度和这两个参数有直接关系。我们观察到磁雷诺数和哈特曼数的相反行为。电流密度J z随R m的增大而增大,温度分布和溶质浓度均增大。本研究的最终结果是提供这些技术的潜力,为纳米流体和其他流体力学领域的挑战性问题提供新的见解和解决方案,并促进设计更高效和有效的微流体装置。
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引用次数: 2
Research progress and prospect of silica-based polymer nanofluids in enhanced oil recovery 硅基聚合物纳米流体在提高采收率中的研究进展与展望
IF 7.4 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2022-0530
Yi Pan, Changqing Zhang, Shuangchun Yang, Yapeng Liu, Abbas Muhammad
Abstract In recent years, silica-based polymer nanofluids (NFs) have attracted more and more attention because they can enhance temperature and salt tolerance. This study summarized the research progress and prospects of silica-based polymer NFs in enhanced oil recovery (EOR). First, the synthesis method and the effect on silica-based polymer NFs were studied. Research progress in rheology, wettability, viscoelasticity, interfacial tension, adsorption, porous media flow, and emulsion stability were reviewed, and the mechanism for EOR was expounded. Then, the mechanical properties of silica-based polymer NFs and the interaction between silica and polymer were discussed by molecular dynamics simulation. And the progress of research on macroscopic reservoir simulation was explored. Finally, the related auxiliary technologies were introduced, and future research directions were put forward. The results of this study will help researchers better understand the mechanism and research progress of silica-based polymer NFs in EOR.
摘要近年来,二氧化硅基聚合物纳米流体(NFs)因其能够提高耐温性和耐盐性而受到越来越多的关注。综述了二氧化硅基聚合物NFs在提高采收率方面的研究进展和前景。首先,研究了二氧化硅基聚合物NFs的合成方法及其对NFs的影响。综述了流变学、润湿性、粘弹性、界面张力、吸附、多孔介质流动和乳液稳定性等方面的研究进展,阐述了提高采收率的机理。然后,通过分子动力学模拟讨论了二氧化硅基聚合物NFs的力学性能以及二氧化硅与聚合物之间的相互作用。并对宏观油藏模拟的研究进展进行了探索。最后介绍了相关的辅助技术,并提出了未来的研究方向。这项研究的结果将有助于研究人员更好地了解二氧化硅基聚合物NFs在提高采收率中的作用机理和研究进展。
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引用次数: 4
Improved osseointegration of dental titanium implants by TiO2 nanotube arrays with self-assembled recombinant IGF-1 in type 2 diabetes mellitus rat model 自组装重组IGF-1纳米TiO2纳米管阵列对2型糖尿病大鼠牙钛种植体骨整合的影响
3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2023-0120
Qian Zhang, Jun-Jun Wang, Qian Xue, Ying-Jie Wang, Min Zhang, Yong-Jin Chen
Abstract Improvement of poor implant osseointegration under diabetes is always a poser in clinics. The purpose of this study was to investigate the effect of TiO 2 nanotubes (TNTs) and self-assembled minTBP-1-IGF-1 on implant osseointegration in type 2 diabetes mellitus (T2DM) rats. There were four groups, the control group, the TNTs group, the minTBP-1-IGF-1 group, and the minTBP-1-IGF-1-TNTs group. The atomic force microscopy and scanning electron microscope (SEM) results showed that 500 nm nanotubes were formed by anodic oxidation and minTBP-1-IGF-1 could self-assemble into almost all nanotubes. ELISA assay confirmed that more protein was adsorbed on TNTs surface. The contact angle of the minTBP-1-IGF-1-TNTs group was the lowest, confirmed that the hydrophilicity was the highest. The double fluorescence staining was used to evaluate the mineral apposition rate (MAR) at early stage and the MAR of the minTBP-1-IGF-1-TNTs group was the highest. Micro-CT images displayed that bone formed around the minTBP-1-IGF-1-TNTs implant was the most homogeneous and dense, and the quantitative analysis of these images at 12 weeks also confirmed these results. The cross-section SEM results showed that the connection between bone and minTBP-1-IGF-1-TNTs implant was the tightest. All results demonstrated that minTBP-1-IGF-1-TNTs can significantly improve low implant osseointegration under T2DM condition.
糖尿病患者种植体骨结合不良的改善一直是临床面临的难题。本研究旨在探讨tio_2纳米管(TNTs)和自组装minTBP-1-IGF-1对2型糖尿病(T2DM)大鼠种植体骨整合的影响。分为对照组、TNTs组、minTBP-1-IGF-1组、minTBP-1-IGF-1-TNTs组。原子力显微镜和扫描电镜(SEM)结果表明,通过阳极氧化形成了500 nm的纳米管,并且minTBP-1-IGF-1可以自组装成几乎所有的纳米管。酶联免疫吸附试验证实,tnt表面吸附了较多的蛋白。minTBP-1-IGF-1-TNTs组接触角最低,证实亲水性最高。采用双荧光染色法评估早期的矿物附着率(MAR), minTBP-1-IGF-1-TNTs组MAR最高。Micro-CT图像显示,minTBP-1-IGF-1-TNTs种植体周围的骨形成最为均匀和致密,12周时的定量分析也证实了这些结果。扫描电镜结果显示,骨与minTBP-1-IGF-1-TNTs种植体的连接最紧密。所有结果表明,minTBP-1-IGF-1-TNTs可以显著改善T2DM条件下种植体的低骨整合。
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引用次数: 0
Induction of apoptosis and autophagy via regulation of AKT and JNK mitogen-activated protein kinase pathways in breast cancer cell lines exposed to gold nanoparticles loaded with TNF-α and combined with doxorubicin 通过调控AKT和JNK丝裂原激活的蛋白激酶途径诱导乳腺癌细胞系凋亡和自噬暴露于负载TNF-α的金纳米颗粒并联合阿霉素
3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2023-0148
Marwa H. Jawad, Majid S. Jabir, Kamile Ozturk, Ghassan M. Sulaiman, Mosleh M. Abomughaid, Salim Albukhaty, Hayder M. Al-kuraishy, Ali I. Al-Gareeb, Waleed K. Al-Azzawi, Mazin A. A. Najm, Sabrean F. Jawad
Abstract Gold nanoparticles (GNPs) tagged with peptides are pioneers in bioengineered cancer therapy. The aim of the current work was to elucidate the potential anticancer interactions between doxorubicin and GNPs loaded with tumor necrosis factor-alpha (TNF-α). To investigate whether GNPs loaded with TNF and doxorubicin could stimulate autophagy and apoptosis in breast cancer cells. Two human breast cancer cell lines, MCF-7 and AMJ-13, as well as different apoptotic and autophagy markers, were used. In both cell types, treatment with TNF-loaded GNPs in conjunction with doxorubicin increased the production of apoptotic proteins including Bad, caspase-3, caspase-7, and p53 with upregulation of the LC3-II and Beclin1 proteins. In addition, the findings showed that the mitogen-activated protein kinase signaling pathway was dramatically affected by the GNPs loaded with TNF-α and combined with doxorubicin. This had the effect of decreasing p-AKT while simultaneously increasing p-JNK1/2. The findings demonstrated that GNPs loaded with TNF-α and combined with doxorubicin can induce both autophagy and apoptosis in breast cancer cells. These results suggest that TNF- and doxorubicin-loaded GNPs provide a therapeutic option as a nanomedicine to inhibit the proliferation of breast cancer.
肽标记的金纳米颗粒(GNPs)是生物工程癌症治疗的先驱。本研究的目的是阐明阿霉素与装载肿瘤坏死因子α (TNF-α)的GNPs之间潜在的抗癌相互作用。探讨负载TNF和阿霉素的GNPs是否能刺激乳腺癌细胞的自噬和凋亡。使用两种人乳腺癌细胞系MCF-7和AMJ-13,以及不同的凋亡和自噬标志物。在这两种细胞类型中,用负载tnf的GNPs联合阿霉素处理增加了凋亡蛋白的产生,包括Bad、caspase-3、caspase-7和p53,并上调LC3-II和Beclin1蛋白。此外,研究结果表明,装载TNF-α并联合阿霉素的GNPs显著影响了丝裂原激活的蛋白激酶信号通路。这具有降低p-AKT同时增加p-JNK1/2的作用。结果表明,GNPs加载TNF-α并联合阿霉素可诱导乳腺癌细胞自噬和凋亡。这些结果表明,TNF-和阿霉素负载GNPs作为纳米药物提供了一种治疗选择,以抑制乳腺癌的增殖。
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引用次数: 0
Effect of polyvinyl alcohol fibers on mechanical properties of nano-SiO2-reinforced geopolymer composites under a complex environment 聚乙烯醇纤维对复杂环境下纳米sio2增强地聚合物复合材料力学性能的影响
3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2023-0142
Peng Zhang, Cong Wang, Zhenhui Guo, Jian Hong, Fei Wang
Abstract Buildings in service are severely affected by the complex environment with multiple coupled factors such as high temperatures, humidity, and inorganic salt attack. In this work, the mechanical properties of nano-SiO 2 -reinforced geopolymer composites (NSGPC) incorporated with varying dosages of polyvinyl alcohol (PVA) fibers were investigated under a complex environment. A simulated environmental chamber was employed to simulate the complex environment with relative humidity, temperature, and NaCl solution concentration of 100%, 45°C, and 5%, respectively. Fly ash/metakaolin geopolymer composites (GPCs) were fabricated by utilizing 1.5% nano-SiO 2 by weight and five various dosages of PVA fibers by volume (0, 0.2, 0.4, 0.6, and 0.8%). The compressive strength, tensile strength, elastic modulus, and impact resistance of NSGPC eroded in a simulated environmental chamber for 60 days were determined. Then, the impact of the PVA fiber dosage on the mechanical properties of NSGPC under complex coupled environments was analyzed. In addition, scanning electron microscopy (SEM) was employed to evaluate and analyze the microstructural behavior of NSGPC under complex environments. Results indicated that the compressive strength, tensile strength, elastic modulus, and impact resistance of NSGPC increased with increasing PVA fiber to 0.6% and then decreased with a continuous increase to 0.8% but remained higher than those of the reference specimen. NSGPC exhibited the best performance at a PVA fiber dosage of 0.6%, which increased by 13.3, 12.0, 17.2, and 522%, respectively. The outcomes of SEM analysis indicated that the usage of PVA fiber and NS remarkably improved the mechanical properties and microstructural behavior of GPC by making the inner structure of GPCs more robust and compact under a complex environment. The outcomes of this work can provide theoretical guidance for buildings serving under a complex environment.
摘要在役建筑受到高温、高湿、无机盐侵袭等多重耦合因素的复杂环境的严重影响。在复杂的环境下,研究了不同剂量聚乙烯醇(PVA)纤维掺入纳米二氧化硅增强地聚合物复合材料(NSGPC)的力学性能。采用模拟环境箱模拟相对湿度为100%、温度为45℃、NaCl溶液浓度为5%的复杂环境。采用重量为1.5%的纳米sio2和体积为0、0.2、0.4、0.6和0.8%的PVA纤维,制备了粉煤灰/偏高岭土聚合物复合材料(GPCs)。测定了NSGPC在模拟环境室腐蚀60 d后的抗压强度、抗拉强度、弹性模量和抗冲击性。然后,分析了复合耦合环境下PVA纤维用量对NSGPC力学性能的影响。此外,利用扫描电子显微镜(SEM)对复杂环境下NSGPC的微观结构行为进行了评价和分析。结果表明:当PVA纤维含量增加至0.6%时,NSGPC的抗压强度、抗拉强度、弹性模量和抗冲击性能均有所增加,但随着PVA纤维含量的增加,该材料的抗压强度、抗拉强度、弹性模量和抗冲击性能均有所下降,但仍高于参考试样;当PVA纤维添加量为0.6%时,NSGPC的性能最好,分别增加了13.3%、12.0%、17.2%和522%。SEM分析结果表明,PVA纤维和NS的使用显著改善了GPC的力学性能和微观结构行为,使GPC的内部结构在复杂环境下更加坚固紧凑。研究结果可为复杂环境下的建筑设计提供理论指导。
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引用次数: 0
Modification effects of nanosilica on asphalt binders: A review 纳米二氧化硅对沥青粘结剂的改性研究进展
3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2023-0138
Yiqing Dai, Wei Liang, Danwang Ye, Shengjia Xie, Yuan Sang, Dong Li
Abstract Nanosilica (NS) may be obtained as a by-product in several industrial processes and is associated with high availability and affordability among other nanoadditives. NS has been used for asphalt modification, and improvement in high-temperature performance and several other physical properties has been reported. However, due to the wide varieties and intrinsic variability of asphalt materials, concerns have been raised about the reproducibility of some conclusions, and therefore, a review was conducted. According to the results, NS additives with a purity of over 99% were usually used for modification and the specific surface area was over 100 m 2 /g, leading to the superior absorption of asphalt and thus improvement in rutting resistance of the mixtures. Due to a lack of guidance for the blending procedures, inconsistency exists among studies in the shear speed, blending duration, and temperature, leading to possible excessive blending and unnecessary energy and time consumption. Rises in NS concentration would cause higher softening point and rotational viscosity, and therefore elevated temperatures for mixing and paving, but penetration would be reduced. According to rheological evaluations, with the rise of NS concentration, the rutting parameter would increase, indicating an improvement in the high-temperature performance, but the low-temperature performance may deteriorate.
纳米二氧化硅(NS)可以作为几种工业过程的副产品获得,并且在其他纳米添加剂中具有高可用性和可负担性。NS已被用于沥青改性,并在高温性能和其他物理性能方面有所改善。然而,由于沥青材料的多样性和内在变异性,人们对一些结论的可重复性提出了担忧,因此,进行了一项审查。结果表明,通常采用纯度在99%以上的NS添加剂进行改性,比表面积在100 m2 /g以上,对沥青的吸收性较好,从而提高了混合料的抗车辙性能。由于缺乏对共混过程的指导,在剪切速度、共混时间、温度等方面的研究存在不一致性,可能导致共混过度,造成不必要的能量和时间消耗。NS浓度升高会导致软化点和旋转粘度升高,从而导致搅拌和铺装温度升高,但渗透率会降低。流变学评价表明,随着NS浓度的升高,车辙参数增大,表明高温性能有所改善,但低温性能有所下降。
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引用次数: 0
Decellularized extracellular matrix as a promising biomaterial for musculoskeletal tissue regeneration 脱细胞细胞外基质是一种很有前途的肌肉骨骼组织再生生物材料
3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2023-0151
Rong Luo, Ruonan Hu, Jiawei Xu, Peiyun Yu, Xinyu Wu, Man Zhe, Ming Liu, Fei Xing, Zhou Xiang, Changchun Zhou, Yujiang Fan, Xingdong Zhang
Abstract The emergence of tissue engineering provides an alternative therapeutic strategy for various regeneration. It is the crucial step for choosing an ideal scaffold to support the cellular behaviors of various functional cells. Various biomaterials have been found or synthesized and applied to tissue repair. Among these biomaterials, as a natural-derived material, decellularized extracellular matrix (dECM) derived from cells, tissues, and organs is attracting more and more interest due to its good biocompatibility, biodegradability, and the ability to mimic a microenvironment similar to extracellular matrix. More and more researchers utilized dECM derived from cells, tissues, and organs to fabricate tissue-engineered scaffolds to repair musculoskeletal tissues, since the bioactive molecules of dECM, such as fibrous proteins, proteoglycans, and adhesive glycoproteins, could provide various bioactive cues for tissue regeneration and remodeling. The physiochemical properties of dECM can be enhanced by changing decellularization and modification techniques. In addition, dECM can act as carriers of drugs, factors, or exosomes, delivering agents to injured tissues and promoting tissue repair and regeneration. Therefore, we conduct this review to discuss the current status and challenges of dECM in repairing the musculoskeletal system. Furthermore, the fabrication and modification of dECM were also discussed in our study.
摘要组织工程的出现为各种再生提供了一种替代治疗策略。选择理想的支架来支持各种功能细胞的细胞行为是至关重要的一步。各种生物材料已被发现或合成并应用于组织修复。在这些生物材料中,来源于细胞、组织和器官的脱细胞细胞外基质(dECM)因其良好的生物相容性、生物可降解性和模拟类似于细胞外基质的微环境的能力而越来越受到人们的关注。越来越多的研究人员利用来自细胞、组织和器官的dECM来制造组织工程支架来修复肌肉骨骼组织,因为dECM的生物活性分子,如纤维蛋白、蛋白聚糖和粘附糖蛋白,可以为组织再生和重塑提供各种生物活性线索。dECM的理化性质可以通过改变脱细胞和修饰技术来增强。此外,dECM还可以作为药物、因子或外泌体的载体,向损伤组织输送药物,促进组织修复和再生。因此,我们就dECM在修复肌肉骨骼系统中的现状及面临的挑战进行综述。此外,本文还对dECM的制备和改性进行了讨论。
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引用次数: 0
Recent advancements in nanotechnology application on wood and bamboo materials: A review 纳米技术在木竹材料中的应用研究进展
IF 7.4 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2022-0528
Dabosmita Paul, M. Gaff, D. Tesařová, D. Hui, Haitao Li
Abstract Wood and bamboo are the greenest renewable materials used for construction, furniture, and decor from the ancient ages. However, wood and bamboo have intrinsic faults like durability, ductility, physical and mechanical strength, and stability, limiting their applications in the industry. On the other hand, nanotechnology is a popular technology having numerous applications in different fields, resulting in a significant increase in expectations among academics, investors, the government, and industries. In contrast, nanotechnology can protect wood and bamboo from extreme conditions (bacteria, climate, etc.) by improving physicochemical characteristics because of its unique features. Nowadays, the trend of merging nanotechnology and forest industries to overcome the limitations mentioned above and get economically sustainable materials for construction, furniture manufacturing, flexible sensors developments, energy storage, battery manufacturing, and many more is increasing. Presently, several reviews on wood and bamboo modification by nanoparticles and nanomaterials have already been published. But, at this time, this study is essential because it aims to provide a brief guide about the recently developed eco-friendly sustainable materials from wood and bamboo, their uses, and how they can affect people’s daily life and helps to point out the gap of the current knowledge. In addition, we briefly describe the conventional and modern modification methods, including the influence of nanomaterials on wood and bamboo structures. This article is outlined as follows: The first phase of the review deals with wood and bamboo modification methods. The second phase explains how the modification method improves the properties of wood and bamboo materials, and the last step will describe the recent innovation of wood and bamboo materials.
木材和竹子是自古以来用于建筑、家具和装饰的最环保的可再生材料。然而,木材和竹子具有耐久性、延展性、物理机械强度和稳定性等固有缺陷,限制了它们在工业上的应用。另一方面,纳米技术是一种流行的技术,在不同的领域有许多应用,导致学术界、投资者、政府和工业的期望显著增加。相比之下,纳米技术可以通过改善其物理化学特性来保护木材和竹子免受极端条件(细菌、气候等)的影响,因为它具有独特的特性。如今,纳米技术与森林工业相结合的趋势正在增加,以克服上述限制,并为建筑、家具制造、柔性传感器开发、能源储存、电池制造等获得经济上可持续的材料。目前,国内外对纳米颗粒和纳米材料对木材和竹子的改性研究已经发表了一些综述。但是,在这个时候,这项研究是必不可少的,因为它旨在提供一个简短的指南,关于最近开发的生态友好的可持续材料,从木材和竹子,它们的用途,以及它们如何影响人们的日常生活,并有助于指出目前的知识差距。此外,我们简要介绍了传统的和现代的改性方法,包括纳米材料对木材和竹子结构的影响。本文概述如下:第一阶段的审查涉及木材和竹子的改性方法。第二阶段解释改性方法如何改善木材和竹材料的性能,最后一步将描述木材和竹材料最近的创新。
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引用次数: 2
Helical fluorinated carbon nanotubes/iron(iii) fluoride hybrid with multilevel transportation channels and rich active sites for lithium/fluorinated carbon primary battery 螺旋氟化碳纳米管/氟化铁(iii)混合材料,具有多级运输通道和丰富的锂/氟化碳原电池活性位点
IF 7.4 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2023-0108
Gaobang Chen, Fengxin Cao, Zexiao Li, Jianan Fu, Baoshan Wu, Yifan Liu, Xian Jian
Abstract Lithium/fluorinated carbon (Li/CF x ) primary battery is a promising energy supply device with high energy density. However, poor electrochemical capabilities such as the initial voltage delay phenomenon and the large polarization have obstructed their applications. The electrochemical performance of CF x primarily depends on the feature of the carbon source and the corresponding fluorination technique. Herein, we developed a high energy density Li/CF x battery by employing helical carbon nanotubes (HCNTs) as the carbon source. In detail, the precise control of the fluorination temperature was designed at the range of 250–400°C to tune the F/C ratio of CF x . Furthermore, the high F/C ratio of fluorinated HCNTs (F-HCNTs) reaches about 1.43, which surpasses the highest theoretical value in fluorinated crystalline carbon materials. Due to the active rich fluorination sites provided by the periodical insertion of the carbon pentacyclic (C5) and heptacyclic (C7) rings, HCNTs exhibited a defect-rich feature and F-HCNTs have a nodular shape. These features favor to enhance the transport of lithium ions and allow more C–F bonds to react with lithium ions, leading to a high energy density of 2133.13 W h/kg. This novel material offers an alternative approach for lithium primary battery being great potential in actual applications.
锂/氟化碳(Li/ cfx)一次电池是一种具有高能量密度的有前途的能源供应装置。但由于初始电压延迟现象和极化较大等电化学性能差,阻碍了其应用。cfx的电化学性能主要取决于碳源的特性和相应的氟化技术。本文采用螺旋碳纳米管(HCNTs)作为碳源,开发了一种高能量密度的Li/CF x电池。在250 ~ 400℃范围内设计了精确的氟化温度控制,以调节CF x的F/C比。此外,氟化HCNTs (F-HCNTs)的高F/C比达到1.43左右,超过了氟化结晶碳材料的最高理论值。由于碳五环(C5)和七环(C7)环的周期性插入提供了活跃的富氟化位点,HCNTs表现出富缺陷的特征,F-HCNTs呈结节状。这些特点有利于增强锂离子的输运,并允许更多的C-F键与锂离子发生反应,从而获得2133.13 W h/kg的高能量密度。这种新型材料为锂一次电池提供了一种替代方法,在实际应用中具有很大的潜力。
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引用次数: 0
Solution-processed Bi2S3/BiVO4/TiO2 ternary heterojunction photoanode with enhanced photoelectrochemical performance 溶液处理Bi2S3/BiVO4/TiO2三元异质结光阳极,提高了光电化学性能
IF 7.4 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.1515/ntrev-2022-0550
Xinli Li, Sha Wang, Kunjie Wang, Jiachen Yang, Kexuan Wang, Chao Han, lihua Li, Renhong Yu, Yong Zhang
Abstract TiO2 is an important component of photoelectric devices. How to broaden the light absorption of TiO2 and accelerate the separation of photo-generated electrons and holes is the focus of the current research. Building heterojunction with narrow band gap semiconductor and TiO2 is one of the important measures to improve its photoelectric performance. We prepared BiVO4/TiO2 binary heterojunction by the simple hydrothermal method and analyzed the effect of BiVO4 precursor solution concentration on the microstructure and photoelectric performance of the heterojunction. BiVO4/TiO2 binary heterojunction can effectively improve the photoelectric performance of TiO2, and the transient current density reaches 85 μA/cm2. To further boost the photocurrent of BiVO4/TiO2, Bi2S3 was in situ grown on the heterojunction to form Bi2S3/BiVO4/TiO2 ternary heterojunction. The results show that the band gap of Bi2S3/BiVO4/TiO2 composites is significantly narrowed compared with that of TiO2. The light absorption has been expanded to the visible range, and the photogenerated current density is also greatly boosted (0.514 mA/cm2). This Bi2S3/BiVO4/TiO2 ternary heterojunction accelerates the separation of photo-carriers and improves the photoelectric performance of the device. The possible transport mechanism of photo-carriers in ternary heterojunction is analyzed. The current study provides an effective strategy for in situ construction of novel multicomponent heterojunction and provides a basis for the application of Bi2S3/BiVO4/TiO2 in the optoelectronic field.
摘要TiO2是光电器件的重要组成部分。如何拓宽TiO2的光吸收,加速光生电子和空穴的分离是目前研究的重点。用窄带隙半导体和TiO2建立异质结是提高其光电性能的重要措施之一。采用简单水热法制备了BiVO4/TiO2二元异质结,并分析了BiVO4前驱体溶液浓度对异质结微观结构和光电性能的影响。BiVO4/TiO2二元异质结可以有效提高TiO2的光电性能,瞬态电流密度达到85μA/cm2。为了进一步提高BiVO4/TiO2的光电流,在异质结上原位生长Bi2S3,形成Bi2S3/BiVO4/TiO2-三元异质结。结果表明,与TiO2相比,Bi2S3/BiVO4/TiO2复合材料的带隙明显缩小。光吸收已经扩展到可见光范围,光生电流密度也大大提高(0.514 mA/cm2)。这种Bi2S3/BiVO4/TiO2三元异质结加速了光载流子的分离,提高了器件的光电性能。分析了光载流子在三元异质结中可能的输运机制。本研究为原位构建新型多组分异质结提供了一种有效的策略,并为Bi2S3/BiVO4/TiO2在光电领域的应用提供了基础。
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