Article
Engineering, Mechanical
S. Ranjan Mishra, Soran Hassani Fard, Taha Sheikh, Kamran Behdinan
Summary: The present study analyzed the electromechanical properties of AlN, BaTiO3, ZnO, PVDF, and KNN-NTK thin-films and compared them with non-biocompatible materials. BaTiO3 and PVDF are recommended for cantilever-based energy harvester setups and axially-loaded configurations.
Article
Polymer Science
Yijing Jiang, Yongju Deng, Hongyan Qi
Summary: Controlling the microstructure of flexible piezoelectric materials enhances the electrical output performance of nanogenerators, with the best results achieved in well-aligned nanofiber arrays. This research sheds light on the potential application of flexible piezoelectric polymer-based nanogenerators in wearable electronic devices.
Review
Materials Science, Multidisciplinary
Tugce A. Arica, Tugba Isik, Tugrul Guner, Nesrin Horzum, Mustafa M. Demir
Summary: In today's digital age, wearable electronics have become one of the most promising fields due to the increasing need and interest in personal and portable electronics. Nanogenerators, utilizing mechanical energy from human body activities, and fiber-structured functional materials with electrospinning technology are recognized as suitable energy sources with high efficiency. Electrospinning stands out as a promising technique for simple, versatile, and continuous fabrication of these energy applications.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Yeunhee Kim, Youngsu Cha
Summary: In this study, the performance of a ring-type energy harvester mounted on a finger flexion structure was studied. The optimal design parameters of the harvester were determined through experiments and theoretical analysis. The maximum harvesting power was achieved when the load resistance matched the impedance of the piezoelectric material.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Electrical & Electronic
P. Deepak, Boby George
Summary: This study introduces a new magnetically coupled method to efficiently transfer vibrational energy to a piezoelectric energy harvester from a source where direct physical contact is not possible. The proposed method offers flexibility in adjusting resonant frequency and increases bandwidth and performance by introducing nonlinearity through magnets.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Physical
Zhuzhu Shao, Xuan Zhang, Jingfeng Liu, Xingang Liu, Chuhong Zhang
Summary: This study constructs a fabric piezoelectric energy harvester (PEH) by introducing piezoelectric anisotropic BaTi2O5 nanorods (BT2-nr) into piezoelectric polyvinylidene fluoride (PVDF) nanofibers. The developed anisotropic PEH can sensitively identify the forces at different bending directions and is a feasible strategy for fabricating self-powered flexible PEHs with high electromechanical conversion efficiency and multifunctionality for wearable piezoelectric pressure sensors.
Article
Chemistry, Physical
Mingyang Yan, Junwen Zhong, Shengwen Liu, Zhida Xiao, Xi Yuan, Di Zhai, Kechao Zhou, Zhaoyang Li, Dou Zhang, Chris Bowen, Yan Zhang
Summary: Flexible piezoelectric energy harvesters based on a three-dimensional interconnected ceramic skeleton, created via freeze casting, show promising potential for energy harvesting applications. The presence of an aligned pore structure significantly enhances the piezoelectric coefficient and energy harvesting figure of merit, resulting in high output voltage and current. Additionally, the highly aligned porosity leads to a piezoelectric composite with high power density.
Article
Chemistry, Multidisciplinary
Saleem Anwar, Morteza Hassanpour Amiri, Shuai Jiang, Mohammad Mahdi Abolhasani, Paulo R. F. Rocha, Kamal Asadi
Summary: Nylon fibers, widely used in textiles, have been difficult to achieve in electronic textiles due to the challenge of achieving the piezoelectric phase; however, piezoelectric nylon-11 fibers have now been demonstrated with potential applications in energy harvesting and motion sensors. A simulation study elucidated the sensitivity of these fibers to mechanical stimuli, and a strategy has been proposed and validated to significantly boost electrical performance. Demonstrating piezoelectric nylon fibers is a major step towards realizing electronic textiles for applications in apparel, health monitoring, sportswear, and portable energy generation.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Automation & Control Systems
Sagar Shrestha, Younsu Jung, Jinhwa Park, Sajjan Parajuli, Gyoujin Cho
Summary: This study explores the use of roll-to-roll (R2R) gravure for printing wireless energy-harvesting labels integrated with diodes and capacitors. The printed labels can successfully harvest energy from the smartphone's NFC carrier with a high conversion efficiency.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Chemistry, Analytical
Bartlomiej Nowacki, Jakub Jala, Krystian Mistewicz, Roman Przylucki, Grzegorz Kopec, Tomasz Stenzel
Summary: The dynamic development of flexible wearable electronics has opened up new possibilities for the production and use of new types of sensors. Polymer nanocomposites have become increasingly popular in sensor fabrication due to their mechanical advantages and functional properties. This study presents the first fabrication of an SbSI/PU nanocomposite as a piezoelectric nanogenerator for strain detection, using simple and efficient technology. The nanocomposite exhibits high flexibility and durability, with a lack of defects in the material structure and low agglomeration of nanowires. The developed nanocomposite shows promising potential for energy harvesting from human body movement, such as being introduced into shoe soles.
Review
Chemistry, Multidisciplinary
Xiaole Cao, Yao Xiong, Jia Sun, Xiaoxiao Zhu, Qijun Sun, Zhong Lin Wang
Summary: With the advent of the Internet of Things era, the demand for wireless, sustainable, and independent operation in large-scale sensor networks is increasing. Self-powered sensory systems that utilize energy from surroundings to drive sensors and sense external stimuli have attracted significant attention.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jae-Kang Kim, Nagaraj Krishna-Subbaiah, Yingdan Wu, Jongkuk Ko, Anitha Shiva, Metin Sitti
Summary: This article presents a two-step curing process to significantly improve the repeatability of the micropatterned flexible silicone molds in UV light curing based R2R systems. The mold repeatability is increased from tens of cycles to over 1000 cycles through this strategy, even for complicated 3D undercut geometries and highly adhesive microstructures.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Composites
N. Arul, M. Suresh, M. Satthiyaraju, N. B. Karthik Babu
Summary: In this study, the properties of electrospun PVDF/WO3 nanorods composite nanofibers were investigated for piezoelectric energy harvesting applications. The addition of WO3 nanorods significantly enhanced the piezoelectric performance of PVDF. The composite nanofibers also exhibited improved thermal stability and mechanical properties.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Analytical
Kevin Nguyen, Matthew Bryant, In-Hyouk Song, Byoung Hee You, Seyedmeysam Khaleghian
Summary: The study found that the application of PVDF in harvesting energy from tire deformation has great potential, not only for energy collection but also as self-powered sensors. Therefore, PVDF is expected to have a wider application in the field of vehicles in the future.
Article
Materials Science, Multidisciplinary
Seoha Kim, Dong Yeol Hyeon, Donghun Lee, Jun Ho Bae, Kwi-Il Park
Summary: A fully flexible single film-based thermoelectric and piezoelectric hybrid generator (TPHG) was proposed and assembled through simple drop-casting and gravitational settling effect. The device generated outputs of 1 μA and 4 V at a temperature difference of 3 K and a bending displacement of 5 mm, and exhibited robust mechanical durability for approximately 5000 bending cycles. This design concept contributes to the development of high-performance multisource energy harvesting devices for wearable sensors.
MATERIALS TODAY PHYSICS
(2023)
Article
Green & Sustainable Science & Technology
Wo Jae Lee, Byung Gun Joung, John W. Sutherland
Summary: Different products have varying environmental impacts throughout their life cycle stages. Maintenance for product life extension is often seen as beneficial for the environment, but in some cases, early product failure can lead to a better performing and more environmentally friendly replacement. This paper develops a methodology using time-varying efficiency erosion models to quantify and compare the environmental and economic performance of different maintenance strategies. A case study on the maintenance of an electric motor driving a pump is presented, and various maintenance strategies are compared in terms of their environmental and economic performance. This method can help manufacturing plants select maintenance strategies that optimize both environmental and economic outcomes.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Polymer Science
Isik Isil Nugay, Cagla Kosak, Emre Unsal, Emel Yilgor, Iskender Yilgor, Mukerrem Cakmak
Summary: The orientation behavior of NH and CH chemical groups of poly(ethylene oxide) (PEO)-based polyurethane urea (PUU) during uniaxial stretching was investigated using spectral birefringence and ultrafast IR spectrometers. The study found that high-molecular-weight PEO-based PUUs exhibited microphase morphologies with sharp interfaces, while low-molecular-weight PEO-2000-based PUU exhibited a gradient interphase due to substantial hydrogen-bonding interactions.
Article
Polymer Science
Amy Blake, M. Cakmak
Summary: In this study, we examined the effect of programmed deformation history on the strain induced crystallization, crystalline order, and chain orientation in initially amorphous poly lactic acid films in a rubbery state. By using a highly instrumented programmable uniaxial stretcher, we were able to continuously measure true strain, true stress, and birefringence during processing. We applied deformation to strategically selected strain levels where the initially amorphous PLA film could potentially strain-crystallize. This was followed by small strain cycling to affect the level of orientation and order in crystalline and amorphous phases.
Article
Engineering, Chemical
Mayank Jain, Zeynep Mutlu, Jiahao Mao, Jierui Zhou, Peinan Zhou, Chao Wu, Yang Cao, Mukerrem Cakmak
Summary: This study investigates the impact of processing on the structure and dielectric properties of Nylon 11 melt cast film. It is found that stretching during processing increases chain orientation levels and crystallinity, improving dielectric properties. Processing in the partially molten state results in the formation of new lamellae with larger long spacings. Additionally, the dielectric properties of Nylon 11 are strongly influenced by the crystallinity and crystal phase, with higher crystallinity in the alpha' phase leading to higher electrical breakdown strength.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Engineering, Chemical
Stella N. Cotner, Siamak Shams Es-haghi
Summary: A highly extensible and tough chemically crosslinked double-network hydrogel was synthesized and its performance under large-strain tensile deformations was studied. The results showed that the hydrogel did not suffer from mechanical damage during the deformation process and maintained its properties even after exposure to harsh environmental conditions such as freeze/thaw or boiling processes. This makes it a promising material for applications involving large temperature variations.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Engineering, Industrial
Bingbing Li, Tongzi Wu, Shijie Bian, John W. Sutherland
Summary: In order to provide affordable and energy-saving solutions for small and medium-sized manufacturers (SMMs), a unified framework is proposed to generate predictive models that can support real-time disaggregation of power consumption from combined inputs and identify machine states automatically. The framework converts raw power consumption into a time series with historical pattern detection capabilities, while a learning architecture uses stacked long short-term memory (LSTM) layers as encoders for embedding generation with sequential awareness. Experimental results show a minimum accuracy of 93.65% in the ideal case of real-time energy usage and machine state prediction.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Industrial
Haiyue Wu, Matthew J. Triebe, John W. Sutherland
Summary: This paper proposes a Transformer-based classifier that can efficiently identify different known types and severity levels of fault conditions, as well as detect novel faults. The method utilizes time-frequency spectrograms transformed from raw vibration signals as input to the classifier for known fault classification. When detecting a novel fault condition, a simple yet effective technique based on Mahalanobis distance is adopted to determine whether the fault comes from a previously unseen condition, and the model is retrained using incremental learning. Experimental results demonstrate that the proposed method outperforms baseline models and a cutting-edge model in terms of fault diagnosis and novelty identification.
JOURNAL OF MANUFACTURING SYSTEMS
(2023)
Article
Environmental Sciences
Huaqing Li, Lin Li, Fengfu Yin, Fu Zhao, John W. Sutherland
Summary: This paper proposes a classification method to improve the accuracy of waste smartphone plastics classification by optimizing spectral data preprocessing and spectral feature extraction.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2023)
Article
Engineering, Environmental
Sidi Deng, Zhongqing Xiao, Wencai Zhang, Aaron Noble, Subodh Das, Yuehwern Yih, John W. Sutherland
Summary: This study proposes and evaluates a novel process called gas-assisted microflow extraction (GAME) for efficiently recovering precious metals from waste printed circuit boards (WPCBs). An economic analysis is conducted to verify the feasibility of the GAME-based process at an industrial scale, and cost-effective production strategies are further investigated. This study may establish a paradigm for economically-informed decisions in sustainable technologies.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Engineering, Environmental
Thomas Maani, Nehika Mathur, Chuanbing Rong, John W. Sutherland
Summary: Due to the growing interest in decarbonization, clean energy technologies like electric vehicles and wind turbines are receiving increased attention. These technologies rely on powerful rare earth permanent magnets, specifically Neodymium-Iron-Boron magnets. Neodymium, a critical material subject to supply chain risks, can be mitigated through circular economy strategies. This study estimates Neodymium use in the US, predicts end-of-life flows of products containing these magnets, evaluates the potential for recovering Neodymium from these products, and assesses its significance in meeting future demand.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Polymer Science
Mayank Jain, Zeynep Mutlu, Jiahao Mao, Jierui Zhou, Chao Wu, Yang Cao, Mukerrem Cakmak
Summary: This study investigates the relationship between structural hierarchy in PVDF/PMMA blends, altered by melt casting and annealing, and their electrical properties. PVDF was blended with PMMA in different compositions, and the films were characterized using various methods to understand the structural changes during processing and their impact on electrical properties. The addition of PMMA suppressed crystalization during film casting, allowing for the development of high preferential chain orientation. The crystallinity in the films correlated directly with breakdown strength. Annealing induced structural changes affected the dielectric properties, as the relaxation of amorphous PMMA during annealing was found to be detrimental to the breakdown properties.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Thermodynamics
Junhua Zhao, Li Li, Lingling Li, Yunfeng Zhang, Jiang Lin, Wei Cai, John W. Sutherland
Summary: This study establishes a multi-dimension coupling model of energy consumption for machining process, which considers the specifications of machine tools, workpieces, and processes. The influence factors of energy consumption are systematically analyzed and the internal interact relationship among each dimensional parameter is illustrated. Experimental results show that the optimal machining configurations can effectively reduce energy consumption and improve the energy-efficiency of CNC machining.
Article
Chemistry, Multidisciplinary
Xiaoyu Zhou, Mariappan Parans Paranthaman, John W. Sutherland
Summary: There is a growing demand for clean energy technologies that rely on high-performance rare earth permanent magnets (REPMs) such as neodymium-iron-boron (NdFeB) magnets. However, the supply of these magnets is at risk due to China's dominance in rare earth element supply. This paper compares the economic feasibility of two processing methods, injection molding (IM) and big-area additive manufacturing (BAAM), for producing bonded magnets from recycled magnet materials. The results show that BAAM is more profitable and economically viable than IM.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Energy & Fuels
Jesus R. Perez-Cardona, John W. Sutherland, Scott D. Sudhoff
Summary: Electric Vehicles (EVs) are considered clean energy technologies in the transportation sector, but the environmental footprint associated with their materials raises concerns about their cleanliness. This study aims to address the supply risk (SR) issues of EVs by developing a design model for electric traction motors using a genetic algorithm. The model prioritizes minimizing motor mass, energy consumption, and materials with high SR. The case study of a surface-mounted permanent magnet synchronous motor demonstrates the relationships between objectives and variables. Future work should consider minimizing environmental impact and cost.
IEEE OPEN ACCESS JOURNAL OF POWER AND ENERGY
(2023)
Article
Polymer Science
Ethan E. O'Banion, S. Shams Es-haghi
Summary: The rheological behavior of cellulose nanofibril (CNF) suspensions with different fines contents and solid concentrations was investigated. The samples showed a gel-like behavior with the highest dynamic moduli observed in samples with 50% fines. CNF suspensions with higher concentrations exhibited higher viscosity and dynamic moduli. A critical shear rate of 10 s-1 was found, above which viscosity measurements converged and below which they diverged. Yield stress decreased and then reached a plateau as fines levels increased. The lowest structure recovery was observed in samples with 50% fines content. A rheopectic-thixotropic transition was observed in samples with high fines content at low solid concentrations.