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A lamellar-ordered poly[bi(3,4-ethylenedioxythiophene)-alt-thienyl] for efficient tuning of thermopower without degenerated conductivity 一种层状有序聚[双(3,4-乙基二氧噻吩)-邻噻吩],用于有效调节热功率而不使电导率退化
Pub Date : 2023-01-01 DOI: 10.20517/ss.2023.10
L. Shen, Meng-ting Liu, Peipei Liu, Jingkun Xu, N. Li, Zhiliang Wan, Zhihong Chen, Cong-cong Liu, Weiqiang Zhou, Yu-Jie Liang, F. Jiang
Modulating the structural order of conjugated polymers has emerged as a significant approach to enhance the organic thermoelectric performance. Among these materials, poly(3,4-ethylenedioxythiophene) is considered a promising candidate due to its high conductivity. However, its low thermopower remains a major obstacle to further improve its performance as an organic thermoelectric material. To address this issue, a series of thiophene derivatives with high rigidity and containing dioxyethylene groups were synthesized, and polymer films were prepared through a simple and mild in-situ polymerization method. The polymer molecule containing a thiophene block, named poly[bi(3,4-ethylenedioxy)-alt-thienyl] , exhibits significant self-rigidification due to non-covalent interactions between oxygen and sulfur atoms, resulting in highly ordered assembly. By adding thiophene and thieno[3,2-b]thiophene structures to the intermediate precursor bi(3,4-ethylenedioxy), the 3,4-ethylenedioxy content in the polymer molecule is altered, leading to an almost four-fold increase in the thermopower of the thin film polymer and achieving a maximum thermopower of around 26 μV·K-1. Although poly[bi(3,4-ethylenedioxy)-alt-thienyl] shows a significant increase in thermopower compared to poly[bi(3,4-ethylenedioxy)], the thin film conductivity exhibits a nearly imperceptible decreasing trend due to its highly ordered microstructure. This work highlights the potential to control the aggregation state of polymer molecules and achieve an approximate decoupling between the conductivity and thermopower of thermoelectric materials by rationally designing polymer molecules.
调制共轭聚合物的结构顺序已成为提高有机热电性能的重要途径。在这些材料中,聚(3,4-乙烯二氧噻吩)由于其高导电性被认为是一个有前途的候选材料。然而,它的低热功率仍然是进一步提高其作为有机热电材料性能的主要障碍。为了解决这一问题,我们合成了一系列高刚性、含二氧乙烯基的噻吩衍生物,并通过简单温和的原位聚合法制备了聚合物薄膜。含有噻吩嵌段的聚合物分子被命名为聚[双(3,4-乙烯二氧基)-硫基],由于氧和硫原子之间的非共价相互作用,表现出显著的自刚性,导致高度有序的组装。通过在中间前驱体双(3,4-乙烯二氧基)中加入噻吩和噻吩[3,2-b]结构,改变了聚合物分子中的3,4-乙烯二氧基含量,使薄膜聚合物的热功率提高了近4倍,最大热功率约为26 μV·K-1。虽然与聚[双(3,4-乙烯二氧基)-硫代基]相比,聚[双(3,4-乙烯二氧基)-硫代基]表现出显著的热功率增加,但由于其高度有序的微观结构,其薄膜电导率呈现出几乎难以察觉的下降趋势。这项工作强调了通过合理设计聚合物分子来控制聚合物分子的聚集状态和实现热电材料的电导率和热功率的近似解耦的潜力。
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引用次数: 0
Recent progress in thermal management for flexible/wearable devices 柔性/可穿戴设备热管理的最新进展
Pub Date : 2023-01-01 DOI: 10.20517/ss.2023.04
J. Yun
Thermal management for wearable devices is evolving to make ubiquitous applications possible based on advanced devices featuring miniaturization, integration, and ultrathin designs. Thermal management and control integrated with wearable devices are highly desirable for various applications for human body monitoring, including external heat exposure and metabolic heat generation, in various activities. Recently, dynamic change materials have been integrated with micro/nano thermal management platforms to address the potential for active thermal management. In this article, recent advances in the architecture of effective thermal management in wearable devices are reviewed, along with the essential mechanisms for managing thermal conditions for users in external/internal thermal environments. Appropriate thermal management approaches are proposed for the design and integration of materials/structures tailored to specific targets in wearable devices. In particular, this review is devoted to materials/structures based on five thermal management strategies: conduction, radiation, evaporation/convection, heat absorption/release, and thermoelectric (TE). Finally, the challenges and prospects for practical applications of thermal management in wearable devices are discussed.
基于小型化、集成化和超薄设计的先进设备,可穿戴设备的热管理正在不断发展,使无处不在的应用成为可能。与可穿戴设备集成的热管理和控制非常适合各种人体监测应用,包括各种活动中的外部热暴露和代谢热产生。最近,动态变化材料已与微/纳米热管理平台集成,以解决主动热管理的潜力。本文回顾了可穿戴设备中有效热管理架构的最新进展,以及在外部/内部热环境中管理用户热条件的基本机制。提出了适合可穿戴设备中特定目标的材料/结构的设计和集成的适当热管理方法。本文特别介绍了基于五种热管理策略的材料/结构:传导、辐射、蒸发/对流、热吸收/释放和热电(TE)。最后,讨论了热管理在可穿戴设备中的实际应用所面临的挑战和前景。
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引用次数: 2
Challenges and progress of chemical modification in piezoelectric composites and their applications 压电复合材料化学改性及其应用的挑战与进展
Pub Date : 2023-01-01 DOI: 10.20517/ss.2022.33
Weiwei Zhang, Yanhu Zhang, Xiaodong Yan, Ying Hong, Zhengbao Yang
Piezoelectric materials directly convert energy between electrical and mechanical domains, and have been widely employed in electronic devices as sensors and energy harvesters. Recent research endeavors are mainly devoted to dealing with problems such as high stiffness, brittleness, toxicity, poor durability, and low piezoelectric coefficients. Among developed strategies, chemical modification captures much attention. However, the exact physical properties and direct experimental evidence of chemical modification remain elusive or controversial thus far. In this review, we discuss the recently developed piezoelectric modification strategies for piezoelectric composites and assess the effect of different chemical modification approaches on piezoelectric properties. Moreover, we outline existing challenges and new applications of piezoelectric composites.
压电材料直接在电气和机械领域之间转换能量,已广泛应用于传感器和能量收集器等电子设备中。近年来的研究主要集中在高刚度、高脆性、高毒性、低耐久性和低压电系数等问题上。在已开发的策略中,化学改性备受关注。然而,到目前为止,化学改性的确切物理性质和直接实验证据仍然难以捉摸或有争议。在本文中,我们讨论了近年来发展的压电改性策略,并评估了不同的化学改性方法对压电材料性能的影响。此外,我们概述了压电复合材料存在的挑战和新的应用。
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引用次数: 0
Reduced graphene oxide reinforced PDA-Gly-PVA composite hydrogel as strain sensors for monitoring human motion 还原氧化石墨烯增强PDA-Gly-PVA复合水凝胶作为监测人体运动的应变传感器
Pub Date : 2023-01-01 DOI: 10.20517/ss.2023.14
Xiaoling Ke, Xiaojiang Mu, Siyi Chen, Zhixiang Zhang, Jianhua Zhou, Yulian Chen, Jie Gao, Jing Liu, Xiaoyang Wang, Chuanguo Ma, Lei Miao
Hydrogels with soft, skin-friendly properties and high biocompatibility are promising alternatives to traditional sensors. However, balancing electrical conductivity and sensitivity remains a significant challenge. The sensitivity-improved strain sensor was designed by reduced graphene oxide (rGO) reinforced polydopamine (PDA)-glycerol (Gly)-polyvinyl alcohol composite hydrogels (PGPHs). The hydrogels exhibited excellent sensing sensitivity with a gauge factor of 2.78, conductivity of 2.2 S/m, tensile deformation of 200%, fast response time of 370 ms, and recovery time of 260 ms, surpassing those of most previously reported hydrogel-based strain sensors. This improvement can be attributed to the high electrical conductivity and uniform distribution of the rGO associated with Gly and PDA. PGPHs also exhibited an attractive monitoring effect for hand movements and precise detection feedback for the slight dynamics of the pharynx. Hydrogel-based strain sensors have been demonstrated as a potentially sustainable solution for dynamic detection and communication.
水凝胶具有柔软、亲肤和高生物相容性的特性,是传统传感器的有希望的替代品。然而,平衡电导率和灵敏度仍然是一个重大挑战。采用还原氧化石墨烯(rGO)增强聚多巴胺(PDA)-甘油(Gly)-聚乙烯醇复合水凝胶(PGPHs)设计了灵敏度提高的应变传感器。该水凝胶具有优异的传感灵敏度,其测量系数为2.78,电导率为2.2 S/m,拉伸变形量为200%,快速响应时间为370 ms,恢复时间为260 ms,超过了之前报道的大多数基于水凝胶的应变传感器。这种改进可归因于与Gly和PDA相关的rGO的高导电性和均匀分布。PGPHs对手部运动的监测效果也很好,对咽部的轻微动态也有精确的检测反馈。基于水凝胶的应变传感器已被证明是动态检测和通信的潜在可持续解决方案。
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引用次数: 0
Shape memory behaviors of 3D printed liquid crystal elastomers 3D打印液晶弹性体的形状记忆行为
Pub Date : 2023-01-01 DOI: 10.20517/ss.2022.28
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引用次数: 1
Stretchable synaptic transistors based on the field effect for flexible neuromorphic electronics 柔性神经形态电子学中基于场效应的可拉伸突触晶体管
Pub Date : 2023-01-01 DOI: 10.20517/ss.2023.06
Xiumei Wang, Longqi Qi, Huihuang Yang, Yuan Rao, Huipeng Chen
Using flexible neuromorphic electronics that emulate biological neuronal systems is an innovative approach for facilitating the implementation of next-generation artificial intelligence devices, including wearable computers, soft robotics devices, and neuroprosthetics. Stretchable synaptic transistors based on field-effect transistors (FETs), which have functions and structures resembling those of biological synapses, are promising technological devices in flexible neuromorphic electronics owing to their high flexibility, excellent biocompatibility, and easy processability. However, obtaining stretchable synaptic FETs with various synaptic characteristics and good stretching stabilities is challenging. Significant efforts to produce stretchable synaptic FETs have been undertaken; and remarkable advances in materials, fabrication processes, and applications have been achieved. From this perspective, we discuss the requirements for neuromorphic devices in flexible neuromorphic electronics and the advantages of stretchable synaptic FETs. Moreover, representative methods used to implement stretchable synaptic transistors, including the structural design and development of intrinsically stretchable devices, are introduced. Additionally, the application of stretchable synaptic transistors in artificial sensory systems such as light, tactile, and multisensory artificial nervous systems is also discussed. Finally, we highlight the possible challenges in implementing and using stretchable synaptic transistors, propose solutions to overcome the current limitations of these devices, and suggest future research directions.
使用模拟生物神经元系统的柔性神经形态电子学是促进下一代人工智能设备实施的创新方法,包括可穿戴计算机、软机器人设备和神经假肢。基于场效应晶体管(fet)的可拉伸突触晶体管具有类似生物突触的功能和结构,具有高柔韧性、良好的生物相容性和易于加工等优点,是柔性神经形态电子学中很有前途的技术器件。然而,获得具有各种突触特性和良好拉伸稳定性的可拉伸突触场效应管是具有挑战性的。在生产可拉伸突触场效应管方面已经做出了重大努力;在材料、制造工艺和应用方面都取得了显著的进步。从这个角度出发,我们讨论了柔性神经形态电子学对神经形态器件的要求以及可拉伸突触场效应管的优势。此外,还介绍了实现可拉伸突触晶体管的典型方法,包括结构设计和内在可拉伸器件的开发。此外,还讨论了可拉伸突触晶体管在光、触觉和多感觉人工神经系统等人工感觉系统中的应用。最后,我们强调了实现和使用可拉伸突触晶体管可能面临的挑战,提出了克服这些器件当前局限性的解决方案,并提出了未来的研究方向。
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引用次数: 0
Energy harvesting through thermoelectrics: topological designs and materials jetting technology 热电能量收集:拓扑设计和材料喷射技术
Pub Date : 2023-01-01 DOI: 10.20517/ss.2022.29
Danwei Zhang, Seng Ann Sia, Samantha Faye Duran, Jianwei Xu, A. Suwardi
The vast amount of waste heat released into the environment, from body heat to factories and boilers, can be exploited for electricity generation. Thermoelectrics is a sustainable clean energy solution that converts a heat flux directly into electrical power and vice versa and therefore has the potential for both energy harvesting and cooling technologies. However, the usage of thermoelectrics for large-scale applications is restrained by its device topologies and energy conversion cost efficiency trade-offs. The increase in complex topological designs reported in literature shows a shift towards customizability and improvement of thermoelectric devices for maximum energy conversion efficiency. Increasing design complexity will require an innovative, cost-effective fabrication method with design freedom capabilities. In light of this, this review paper seeks to summarize various thermoelectric topological designs as well as how 3D Printing technology can be a solution to the fabrication of cost-and performance-efficient thermoelectric devices. Specifically, as a process category of 3D Printing technology, Materials Jetting will be elaborated for its usefulness in the fabrication of thermoelectric devices. With in-depth research in materials jetting of thermoelectrics, the gap between small-scale materials research and scaled-up industry applications for energy harvesting through thermoelectric devices is expected to be bridged.
从人体热量到工厂和锅炉释放到环境中的大量废热可以用于发电。热电是一种可持续的清洁能源解决方案,可以将热流直接转化为电能,反之亦然,因此在能量收集和冷却技术方面都有潜力。然而,热电在大规模应用中的使用受到其器件拓扑结构和能量转换成本效率权衡的限制。文献中报道的复杂拓扑设计的增加表明了向可定制性和改进热电器件以实现最大能量转换效率的转变。不断增加的设计复杂性将需要一种具有设计自由能力的创新、经济高效的制造方法。鉴于此,本文旨在总结各种热电拓扑设计,以及3D打印技术如何成为制造成本和性能高效的热电器件的解决方案。具体来说,作为3D打印技术的一个工艺类别,材料喷射将阐述其在热电器件制造中的实用性。随着热电材料喷射研究的深入,热电装置能量收集的小规模材料研究与大规模工业应用之间的差距有望弥合。
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引用次数: 1
Applications of flexible and stretchable three-dimensional structures for soft electronics 柔性和可拉伸三维结构在软电子中的应用
Pub Date : 2023-01-01 DOI: 10.20517/ss.2023.07
Jang Hwan Kim, Su Eon Lee, Bong Hoon Kim
The development of devices that can be mechanically deformed in geometrical layouts, such as flexible/stretchable devices, is important for various applications. Conventional flexible/stretchable devices have been demonstrated using two-dimensional (2D) geometry, resulting in dimensional constraints on device operations and functionality limitations. Accordingly, expanding the dimensions in which such devices can operate and acquiring unique functionality that is difficult to implement in 2D planar structures remain challenging. As a solution, the development of a flexible/stretchable device embedding a three-dimensional (3D) structure fabricated through the precise control of a 2D structure or direct construction has been attracting significant attention. Because of a significant amount of effort, several 3D material systems with distinctive engineering properties, including electrical, optical, thermal, and mechanical properties, which are difficult to occur in nature or to obtain in usual 2D material systems, have been demonstrated. Furthermore, 3D advanced material systems with flexibility and stretchability can provide additional options for developing devices with various form factors. In this review, novel fabrication methods and unprecedented physical properties of flexible/stretchable 3D material systems are reviewed through multiple application cases. In addition, we summarized the latest advances and trends in innovative applications implemented through the introduction of advanced 3D systems in various fields, including microelectromechanical systems, optoelectronics, energy devices, biomedical devices, sensors, actuators, metamaterials, and microfluidic systems.
可以在几何布局中进行机械变形的器件的开发,例如柔性/可拉伸器件,对于各种应用都很重要。传统的柔性/可拉伸设备已经使用二维(2D)几何结构进行了演示,导致设备操作和功能限制的尺寸限制。因此,扩大此类设备可以操作的尺寸并获得难以在二维平面结构中实现的独特功能仍然具有挑战性。作为一种解决方案,通过精确控制二维结构或直接构建来嵌入三维(3D)结构的柔性/可拉伸装置的开发已经引起了人们的极大关注。由于大量的努力,已经证明了几种具有独特工程特性的3D材料系统,包括电学、光学、热学和机械性能,这些特性在自然界中很难发生或在通常的2D材料系统中难以获得。此外,具有灵活性和可拉伸性的3D先进材料系统可以为开发各种形状因素的设备提供额外的选择。本文通过多个应用案例,综述了柔性/可拉伸3D材料系统的新型制造方法和前所未有的物理性能。此外,我们还总结了通过引入先进的3D系统在各个领域的创新应用的最新进展和趋势,包括微机电系统、光电子、能源设备、生物医学设备、传感器、执行器、超材料和微流体系统。
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引用次数: 0
Recent advances in the design, fabrication, actuation mechanisms and applications of liquid crystal elastomers 液晶弹性体的设计、制造、驱动机构及应用的最新进展
Pub Date : 2023-01-01 DOI: 10.20517/ss.2023.03
Yue Xiao, Jun Wu, Yihui Zhang
Liquid crystal elastomers (LCEs), as an intriguing class of soft active materials, exhibit excellent actuation performances and biocompatible properties, as well as a high degree of design flexibility, which have been of increasing interest in many disciplines. This review summarizes recent developments in this inspiring area, providing an overview of fabrication methods, design schemes, actuation mechanisms, and diverse applications of LCEs. Firstly, two-stage and one-pot synthesis methods, as well as emerging fabrication techniques (e.g., 3D/4D printing and top-down microfabrication techniques) are introduced. Secondly, the design and actuation mechanisms are discussed according to the different types of stimuli (e.g., heat, light, and electric/magnetic fields, among others). Thirdly, the representative applications are summarized, including soft robotics, temperature/strain sensors, biomedical devices, stretchable displays, and smart textiles. Finally, outlooks on the scientific challenges and open opportunities are provided.
液晶弹性体(LCEs)作为一类令人感兴趣的软活性材料,具有优异的驱动性能和生物相容性,以及高度的设计灵活性,已引起许多学科的兴趣。本文综述了这一领域的最新进展,概述了lce的制造方法、设计方案、驱动机构和各种应用。首先,介绍了两阶段和一锅合成方法,以及新兴的制造技术(例如3D/4D打印和自上而下的微制造技术)。其次,根据不同类型的刺激(如热、光和电场/磁场等),讨论了设计和驱动机构。第三,总结了具有代表性的应用,包括软机器人、温度/应变传感器、生物医学设备、可拉伸显示器和智能纺织品。最后,展望了科学挑战和开放的机遇。
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引用次数: 1
A systematic review of fused deposition modeling process parameters 熔融沉积建模工艺参数的系统综述
Pub Date : 2022-01-01 DOI: 10.20517/ss.2022.08
N. N. Ahmad, Y. H. Wong, N. Ghazali
Fused deposition modeling (FDM) is an additive manufacturing technique with significant advantages, including cost effectiveness, applicability for a wide range of materials, user-friendliness and small equipment features. However, its poor resolution represents a hindrance for functional parts for commercial production. In this review, the key process parameters are presented with their factors and effects on the characteristics of FDM-printed polymeric products. Hence, better insights into the relationship between key parameters and three main printing characteristics, namely, surface roughness, mechanical strength and dimensional accuracy, in existing FDM research are provided. A conclusion that addresses the challenges and future research directions in this area is also presented.
熔融沉积建模(FDM)是一种具有显著优势的增材制造技术,包括成本效益、广泛的材料适用性、用户友好性和小型设备特性。然而,其较差的分辨率阻碍了功能部件的商业化生产。本文综述了关键工艺参数及其对fdm打印聚合物产品性能的影响。因此,可以更好地了解现有FDM研究中关键参数与三个主要打印特性(即表面粗糙度、机械强度和尺寸精度)之间的关系。最后,提出了该领域面临的挑战和未来的研究方向。
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引用次数: 5
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Soft science
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