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Multifunctional Materials最新文献

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Index 指数
Q1 Materials Science Pub Date : 2020-03-23 DOI: 10.1515/9783110345001-006
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引用次数: 0
List of Contributing Authors 贡献作者名单
Q1 Materials Science Pub Date : 2020-03-23 DOI: 10.1515/9783110345001-203
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引用次数: 0
Frontmatter Frontmatter
Q1 Materials Science Pub Date : 2020-03-23 DOI: 10.1515/9783110345001-fm
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引用次数: 0
Contents 内容
Q1 Materials Science Pub Date : 2020-03-23 DOI: 10.1515/9783110345001-toc
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引用次数: 0
2. Controllable design, synthesis and characterization of nanostructured rare earth metal oxides 2. 纳米稀土金属氧化物的可控设计、合成与表征
Q1 Materials Science Pub Date : 2020-03-23 DOI: 10.1515/9783110345001-002
Yunyun Zhou
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引用次数: 3
Grand challenges in the design and manufacture of vascular self-healing 设计和制造血管自我修复的巨大挑战
Q1 Materials Science Pub Date : 2020-02-27 DOI: 10.1088/2399-7532/ab69e2
Isabel P. S. Qamar, N. Sottos, R. Trask
This perspective details the grand challenges of designing and manufacturing multifunctional materials to impart autonomous property recovery. The susceptibility of advanced engineering composites to brittle fracture has led to the emergence of self-healing materials. This functionality has been demonstrated in bulk polymers and fibre-reinforced composites; most recently through the addition of vascular networks into the host material. These network systems enable the healing agents to be transported over long distances and provide a means by which both the resin and hardener can be replenished, thus overcoming the inherent limitations of capsule-based systems. To date, vascule fabrication methods include machining, fugitive scaffold processes, a lost-wax process and the vaporisation of sacrificial components, but recent developments in additive manufacturing (AM) technologies have paved the way for more efficient, bio-inspired vascular designs (VDs) to be realised. This perspective reviews the current progress in vascular self-healing and discusses how AM technologies and new design methods can be exploited in order to fabricate networks that are optimised for fluid transport and structural efficiency. The perspective culminates in the discussion of eight grand challenges across three thematic areas: ‘VD’, ‘Healing Chemistry’ and ‘AM’, that are likely to have major breakthroughs and socio/economic impact as these technologies are developed further in the next 10–15 years.
这一观点详细介绍了设计和制造多功能材料以实现自主财产恢复的巨大挑战。先进工程复合材料对脆性断裂的敏感性导致了自修复材料的出现。这种功能已在大块聚合物和纤维增强复合材料中得到证实;最近通过在宿主物质中加入血管网络。这些网络系统使修复剂能够长距离运输,并提供了一种树脂和硬化剂都可以补充的方法,从而克服了基于胶囊系统的固有局限性。迄今为止,血管制造方法包括机械加工、游离支架工艺、失蜡工艺和牺牲部件汽化,但增材制造(AM)技术的最新发展为实现更高效的仿生血管设计(vd)铺平了道路。本观点回顾了血管自修复的当前进展,并讨论了如何利用AM技术和新的设计方法来制造优化流体输送和结构效率的网络。该观点在三个主题领域的八大挑战的讨论中达到高潮:“VD”,“愈合化学”和“AM”,随着这些技术在未来10-15年的进一步发展,这些挑战可能会有重大突破和社会/经济影响。
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引用次数: 19
Effects of network structure on the mechanical and thermal responses of liquid crystal elastomers 网络结构对液晶弹性体力学和热响应的影响
Q1 Materials Science Pub Date : 2020-02-04 DOI: 10.1088/2399-7532/ab6d1e
J. Boothby, Tessa Van Volkenburg, N. Le, K. Ohiri, M. Hagedon, Z. Xia
Thermoresponsive liquid crystal elastomers (LCEs) have a high potential to be used for actuation applications. There has been a substantial amount of literature on synthesis of different LCE networks and their corresponding performance. However, much of the prior work focuses on the experimental aspect of the effects of mesogenic species, crosslinkers, and spacers on the thermal and mechanical response of LCE. Here we have built on these prior studies, and expanded understanding of LCE work capacity and thermal properties to the molecular and network structures by comparing the experimental results to the theoretically predicted values based on a random walk model derived from classical rubber elasticity. A previously developed two stage thiol-acrylate LCE chemistry was used as the model system. On the basis of increasing the chain entropy, we varied crosslinker concentration, crosslinker functionality, and liquid crystal mesogen length and showed that average molecular weight between crosslinks and molecular weight of the Kuhn segment play important roles in controlling the work capacity. The rubber elastic model predicted network performance agreed reasonably well with the experimental results.
热响应液晶弹性体(LCE)具有用于致动应用的高潜力。关于不同LCE网络的合成及其相应性能,已有大量文献。然而,许多先前的工作集中在介晶物种、交联剂和间隔物对LCE的热响应和机械响应的影响的实验方面。在这里,我们建立在这些先前的研究基础上,并通过将实验结果与基于经典橡胶弹性导出的随机行走模型的理论预测值进行比较,将对分子和网络结构的LCE功能和热性能的理解扩展到了LCE功量和热性能。使用先前开发的两阶段巯基丙烯酸酯LCE化学作为模型系统。在增加链熵的基础上,我们改变了交联剂浓度、交联剂官能度和液晶介晶长度,并表明交联之间的平均分子量和库恩链段的分子量对控制功容量起着重要作用。橡胶弹性模型预测的网络性能与实验结果相当吻合。
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引用次数: 2
Damage-tolerant, laminated structural supercapacitor composites enabled by integration of carbon nanotube fibres 通过集成碳纳米管纤维实现的耐损伤层压结构超级电容器复合材料
Q1 Materials Science Pub Date : 2020-01-27 DOI: 10.1088/2399-7532/ab686d
Moumita Rana, Y. Ou, Chenchen Meng, F. Sket, C. González, J. Vilatela
A natural embodiment for multifunctional materials combining energy-storing capabilities and structural mechanical properties are layered structures, similar to both laminate structural composites and electrochemical energy-storage devices. A structural composite with integrated electric double layer capacitive storage is produced by resin infusion of a lay up including woven glass fabric used as mechanical reinforcement, carbon nanotube non-woven fabrics as electrodes/current collectors and a polymer electrolyte. The energy-storing layer is patterned with holes, which after integration form resin plugs for mechanical interconnection between layers, similar to rivets. Finite element modelling is used to optimise rivet shape and areal density on interlaminar shear properties. Galvanostatic charge-discharge tests during three-point bending show no degradation of properties after large deflections or repeated load/unload cycling at 3.5 V. This mechanical tolerance is a consequence of the elimination of metallic current collectors and the effective integration of multifunctional materials, as observed by electron microscopy and x-ray computed tomography. In contrast, control samples with metallic current collectors, analogous to embedded devices, rapidly degrade upon repeated bending.
结合储能能力和结构机械性能的多功能材料的一个自然实施方案是层状结构,类似于层压结构复合材料和电化学储能装置。一种具有集成双电层电容存储的结构复合材料是通过对叠层的树脂注入而制备的,叠层包括用作机械增强的玻璃织物、用作电极/集电器的碳纳米管无纺布和聚合物电解质。储能层被图案化为具有孔,孔在集成后形成用于层之间机械互连的树脂塞,类似于铆钉。有限元建模用于优化铆钉形状和面密度对层间剪切性能的影响。三点弯曲过程中的恒电流充放电测试显示,在3.5V下进行大挠度或重复加载/卸载循环后,性能没有退化。如电子显微镜和x射线计算机断层扫描所观察到的,这种机械公差是消除金属集电器和有效集成多功能材料的结果。相反,具有金属集电器的对照样品,类似于嵌入式器件,在重复弯曲时会迅速降解。
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引用次数: 12
Programming the time into 3D printing: current advances and future directions in 4D printing 将时间编程为3D打印:4D打印的当前进展和未来方向
Q1 Materials Science Pub Date : 2020-01-21 DOI: 10.1088/2399-7532/ab54ea
Beijun Shen, O. Erol, Lichen Fang, S. Kang
3D printing technology has revolutionized various fields since it was first developed in the 1980s. In 2013, time was introduced to the spatial dimensions of the 3D printing as a new dimension leading to 4D printing. This emerging technology integrates stimuli-responsive materials with 3D printing technologies and opened up new possibilities for challenging problems by allowing the fabrication of complex structures that can undergo programmed temporal changes in response to external stimuli. Despite extensive research on advanced materials and printing techniques, the programming pathways of time into the structures and materials are still in the early stages. In this review, we comprehensively reviewed the potential programming routes of time utilized in 4D printing. These programming routes were identified and classified into three main approaches based on the timing of the programming during the 4D printing processes. These categories are designated as pre-, peri- and post-printing approaches. Then, these main categories were further expanded based on the methods employed during 4D printing to achieve temporal changes. We have also classified the computational tools used to design, program, and fabricate 4D printed structures, specifically focusing on materials modeling and structural design approaches. Finally, we have discussed the current challenges and roadblocks that need to be overcome within 4D printing frameworks to make 4D printing a highly accessible technology.
自20世纪80年代首次开发以来,3D打印技术已经彻底改变了各个领域。2013年,时间作为一个新的维度被引入到3D打印的空间维度中,从而产生了4D打印。这种新兴技术将刺激响应材料与3D打印技术相结合,通过允许制造复杂结构,可以响应外部刺激进行程序化的时间变化,为具有挑战性的问题开辟了新的可能性。尽管对先进材料和印刷技术进行了广泛的研究,但时间进入结构和材料的编程途径仍处于早期阶段。在这篇综述中,我们全面回顾了4D打印中可能利用的时间规划路线。根据4D打印过程中编程的时间,这些编程路线被识别并分为三种主要方法。这些类别被指定为印前、印中和印后方法。然后,根据4D打印中使用的方法,进一步扩展这些主要类别,以实现时间变化。我们还分类了用于设计、编程和制造4D打印结构的计算工具,特别关注材料建模和结构设计方法。最后,我们讨论了当前的挑战和需要在4D打印框架内克服的障碍,使4D打印成为一种高度可访问的技术。
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引用次数: 23
Advanced functional materials for soft robotics: tuning physicochemical properties beyond rigidity control 用于软机器人的先进功能材料:超越刚性控制调节物理化学特性
Q1 Materials Science Pub Date : 2019-12-31 DOI: 10.1088/2399-7532/ab4f9d
T. Calais, P. Valdivia y Alvarado
Reversibility, a key property in materials science and soft matter, is extremely desirable to enable advanced functionality in soft robots. So far, tunable rigidity has attracted most of the attention, notably for its application in novel soft actuators, soft grippers, and its potential impact in locomotion of soft and hybrid robotic devices. Herein, we review recent progress on reversibility in other physicochemical properties which can also play important roles in the functionality of soft robots. We focus on the tunability of five key properties: electrical and thermal conductivities, surface wettability and adhesion, and optical properties. Materials and mechanisms are described, and performances are assessed, when possible, in terms of reversible tunability range, time response, cycling endurance, and power consumption. The potential integration of such solutions to soft robots is systematically discussed.
可逆性是材料科学和软物质的一个关键特性,对于实现软机器人的高级功能来说是非常理想的。到目前为止,可调刚度吸引了大多数人的注意,尤其是它在新型软致动器、软夹具中的应用,以及它在软机器人和混合机器人设备运动中的潜在影响。在此,我们回顾了其他物理化学性质的可逆性的最新进展,这些性质也可以在软机器人的功能中发挥重要作用。我们专注于五个关键特性的可调谐性:电导率和热导率、表面润湿性和粘附性以及光学特性。描述了材料和机制,并在可能的情况下,根据可逆可调性范围、时间响应、循环耐久性和功耗对性能进行了评估。系统地讨论了这种解决方案与软机器人的潜在集成。
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引用次数: 12
期刊
Multifunctional Materials
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