Article
Engineering, Multidisciplinary
Yanwei Liu, Hansong Ma, Hao Long, Shiyuan Wei, Siyuan Zhang, Yueguang Wei
Summary: In this study, a multi-scale indentation model for stiff film-compliant substrate structures is established based on the strain gradient theory and the surface elastic model. The indentation size effect of the structure is investigated from three aspects: the load-depth relationship, the distribution of bending moments in the film, and the surface morphology. The results show that the indentation size effect is mainly caused by the characteristic length and the surface residual stress of the film, and it is sensitive to the modulus ratio of the film to the substrate. Two dimensionless numbers are proposed to evaluate the indentation size effect, and the predicted bending stiffness by the theoretical model is consistent with the experimental result.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Multidisciplinary
Liu YanWei, Zhang SiYuan, Long Hao, Wei YueGuang
Summary: This study establishes a trans-scale surface wrinkling model for SFCS based on the strain gradient theory and investigates the effect of the intrinsic characteristic length on surface wrinkling behavior. The results show that at the micro scale, the intrinsic characteristic length leads to an increase in the critical wrinkling wavelength and load, and the scaling relationship of surface wrinkling differs from the traditional model.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Mechanics
Hao Long, Yanwei Liu, Yueguang Wei
Summary: This study proposes a theoretical model based on the bilinear cohesive zone model to characterize the debonding process of stiff film/compliant substrate systems. The solutions of this model are validated by experimental data and finite element analysis, showing that it can accurately capture the debonding process and discuss the influencing factors.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Siavash Nikravesh, Yu-Lin Shen
Summary: This study investigated the effects of deformation history involving different loading sequences on the surface wrinkling instability. The results showed that the loading path played an important role in the temporal development of wrinkle configurations, leading to different surface patterns.
Article
Materials Science, Multidisciplinary
Christine Jamin, Apurv Dash, Nachiketa Mishra, Rajendra K. Bordia, Olivier Guillon
Summary: The sintering behavior of ring-shaped alumina films on different substrates was investigated, and the interfacial friction parameter played a key role in determining the slip distance of the free edge, thus influencing the opening and closing of the inner hole.
Article
Engineering, Civil
Vishwas Mahesh, Sharnappa Joladarashi, Satyabodh M. Kulkarni
Summary: This study investigates the ballistic performance of neat jute fabric and its composites, showing that compliant hybrid composites exhibit enhanced ballistic response compared to stiff composites. The addition of rubber significantly affects the ballistic performance of the composites, maintaining their flexibility.
THIN-WALLED STRUCTURES
(2021)
Article
Chemistry, Applied
Peixia Gu, Xuejun Chen
Summary: This study investigates the blistering phenomenon in stiff thin films deposited on compliant substrates under excessive compressive stresses. Experimental analysis reveals two blistering modes depending on film/substrate properties and interface adhesion. The quantification of interface crack role in blistering mode selection is achieved through theoretical estimations and finite element method validation, providing insights for effective thin-film device design and evaluation.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Qiongyu Li, Tongzhi Liu, You Li, Fang Li, Yanshuai Zhao, Shihao Huang
Summary: By utilizing chemical vapor deposition (CVD) and a repetitive wrinkling-etching-regrowth procedure, we have successfully synthesized high-quality, large-area bilayer graphene. Rapid cooling induced the formation of high-density wrinkles in the monolayer area, which were selectively etched to expose the active Cu surface for the nucleation and growth of the second graphene layer. This research provides valuable insights into the growth processes and future commercial applications of bilayer graphene.
Article
Chemistry, Physical
Jun Li, Linan Li, Chuanwei Li, Zhiyong Wang, Shibin Wang, Xiuli Xue
Summary: With the development of flexible electronic technology and the increasing demand for flexible electronic devices, it has become essential to study the fracture behavior of soft polymer-substrate metal film structures. This study investigated the fracture development of Cr film on a polyimide (PI) substrate under biaxial stress. Results showed that fractures initially appeared at the perimeter of the film and then propagated towards the center under biaxial stress, with the crack propagation direction influenced by the biaxial loading ratio.
Article
Nanoscience & Nanotechnology
Jooyeon Shin, Jong-Gu Lee, Gunhee Lee, Peter Pikhitsa, Sang Moon Kim, Mansoo Choi, Yong Whan Choi
Summary: This study presents a smart switching surface that can generate and remove wrinkles reversibly to adapt to both wet and dry environments, enabling robots to complete tasks in different conditions. The wrinkles on denser and smaller hexagonal patterns generate six times more friction than non-switching flat surfaces in wet environments, and a similar amount of friction to the flat surfaces in dry environments.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Mechanics
Jun Li, Chuanwei Li, Linan Li, Qi Wang, Zhiyong Wang, Shibin Wang, Cuiru Sun
Summary: This study focuses on the fracture behavior of stiff-thin-film-on-soft-substrate structures (STFSS) under biaxial stress state, using a self-developed biaxial tension rig for experimental research. The analysis and discussion include the design and fabrication of specimens, as well as the influence of biaxial loading ratio and prefab cracks on STFSS fracture behavior. The experimental results align well with the theoretical model, validating the feasibility of the investigation for STFSS.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Catherine Jiayi Cai, Manivannan Sivaperuman Kalairaj, Hui Huang, Po-Yen Chen, Hongliang Ren
Summary: This study develops a transfer-free method to generate hierarchical wrinkle patterns in MXene thin films by utilizing the thermal-elastic properties of a latex balloon substrate. A stretchable stain-insensitive contact sensor is fabricated using a 2D1D electrode and the behavior of the sensor can be tuned by varying the thickness of the spacer. The sensor exhibits different pressure sensitivities at different pressure ranges and strain conditions.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Bin Li, Keke Li, Wei Xu, Mingzhu Yan, Jianhao Zhao, Wukun Zhang, Mingshuai Yuan, Yanyan Fu, Qingguo He, Jiangong Cheng
Summary: Drug abuse poses a direct threat to human health and social security, making rapid and sensitive detection crucial. The use of organic film-based fluorescent sensing technology has gained attention for its simplicity and speed in drug and explosive detection. This study introduces a novel fluorescent polymer probe and a UV-ozone substrate treatment method to modify the surface morphology of the film. The results show improved sensing performance in detecting methylphenethylamine vapor, with a significantly reduced detection limit.
Article
Electrochemistry
Aziz Aynaou, Boubaker Youbi, Youssef Lghazi, Mohammed Ait Himi, Jihane Bahar, Chaimaa El Haimer, Ahmed Sahlaoui, Itto Bimaghra
Summary: This study investigates the electrodeposition mechanism of polyaniline film on ITO substrate in an acidic medium and explores the effect of electropolymerization potential on the specific capacitance of the films.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Siavash Nikravesh, Donghyeon Ryu, Yu-Lin Shen
Summary: This study uses a computational method to simulate the formation of wrinkles and buckling in thin films under compressive loading, revealing the influence of substrate thickness and loading biaxiality on the formation of wrinkles and buckle.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yan Chen, Huasong Qin, Huichao Liu, Langquan Shui, Yilun Liu, Xi Chen
Summary: In this study, the deformable tension-shear (DTS) model is extended to non-uniform staggering using two different methods, and different staggering modes are investigated. The ratio of minimum in-plane adjacent break distance to the effective shear load transfer length plays a critical role in determining the mechanical behaviors of graphene layered materials. The results provide insights that can guide the design of high-performance nacre-like materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Thermodynamics
Y. Lei, B. W. Zhang, B. F. Bai, X. Chen, T. S. Zhao
Summary: In this study, a transient model for vanadium redox flow batteries (VRFBs) with anion exchange membranes (AEMs) is proposed, which accurately describes the mass and charge transfer processes by incorporating ion selective adsorption and improving transport coefficients. It is found that the current density in AEM is carried by both H(+) and HSO4- ions, and AEM parameters can be adjusted to improve battery performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Ziyi Shui, Wei Zhao, Hang Xiao, Liangliang Zhu, Yilun Liu, Xiaobin Deng, Xi Chen
Summary: This study presents an effective strategy to synthesize three-dimensional ordered macroporous perovskite oxides, with La0.75Sr0.25MnO3 displaying excellent ORR activity and durability alongside a considerable specific surface area. The electrochemical results show that the electron transferred numbers are close to 4 and the H2O2 yield is as low as 10% for 3DOM LSMO, due to the comprehensive effect of reduced Mn valence state, increased specific surface, and exposed high activity crystal planes. The experimental results are in good agreement with first principles study, indicating that perovskite oxides with larger surface area could be advanced oxygen catalysts with wide applications.
JOURNAL OF POWER SOURCES
(2022)
Article
Materials Science, Multidisciplinary
Huiying Tian, Kai Wang, Ziyi Shui, Muhammad Ali Raza, Hang Xiao, Meidan Que, Liangliang Zhu, Xi Chen
Summary: Metal phthalocyanines molecular catalysts demonstrate unique ability in CO2 electrochemical reduction reaction (CO2ERR) due to their well-defined macrocycle structure. By introducing different substituent functional groups on the phthalocyanine ring of cobalt phthalocyanine, the relationship between molecular structure optimization and CO2ERR activity was studied. An optimal nitro-substituted cobalt phthalocyanine catalyst can achieve high selectivity of 94% in converting CO2 to CO, with a current density of 12.6 mA cm(-2) at -0.877 V vs. RHE. Insights gained from this study on designing and optimizing molecular catalysts contribute to lower energy and cost-effective CO2ERR.
Article
Chemistry, Multidisciplinary
Kai Wu, Ting Zhu, Liangliang Zhu, Yu Sun, Kai Chen, Jiaorui Chen, Haozhi Yuan, Yaqiang Wang, Jinyu Zhang, Gang Liu, Xi Chen, Jun Sun
Summary: In this study, we report three reversible mechanochromic phenomena in simple material systems by harnessing mechano-responsive wrinkling dynamics. The results demonstrate the potential applications of these materials in smart displays, stretchable strain sensors, and antipeeping/anticounterfeiting devices.
Article
Engineering, Chemical
Feng Li, Yifan Zhang, Shiqiang Zheng, Kai Wang, Jia Ni, Liangliang Zhu, Xi Chen
Summary: The adsorption performance of a resin-based ion-exchange membrane loaded with CO32- was investigated in different CO2 concentrations and relative humidity. The study indicated that the moisture sensitivity of the adsorption capacity decreased with the initial CO2 concentration.
ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Xueyan Sun, Liangliang Zhu, Wei Zhao, Feng Li, Xi Chen
Summary: In this study, a chemical looping scheme was developed to efficiently reduce impure CO2 containing O-2 impurities into high value-added substances. The synergistic effect of Ni and Fe played a key role in achieving high conversion and yield. This work presents a promising approach for direct utilization of impure CO2 and achieving carbon-neutral economic development.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Sile Yu, Ziyi Shui, Chenghua Wang, Yuan Lei, Yilun Liu, Wei Zhao, Xi Chen
Summary: A series of La0.8Sr0.2FeO3-based perovskite catalysts have been created by sol-gel method, which can substitute expensive precious metal catalysts and exhibit higher ORR and OER performance.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Construction & Building Technology
Lixi Liu, Yilun Liu, Xiaogeng Tian, Xi Chen
Summary: This study demonstrates that carbonation curing using flue gas can lead to higher CO2 uptake and compressive strength compared to pure CO2 curing. The rate of flue gas carbonation is slower at the beginning, but the CO2 uptake and compressive strength are higher than pure CO2 after 12 hours of carbonation. Furthermore, by properly combining carbonation and hydration curing, the 28-day strength of flue gas carbonated specimens can exceed that of hydration specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ziyi Shui, Huiying Tian, Sile Yu, Hang Xiao, Wei Zhao, Xi Chen
Summary: This study demonstrates the creation of Mn-based perovskite nanoparticles with excellent bifunctional oxygen electrocatalysis through precise control of their electronic structures. The results show promising potential for rechargeable Zn-air batteries.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Ziyi Shui, Huiying Tian, Muhammad Ali Raza, Liangliang Zhu, Wei Zhao, Xi Chen
Summary: Rechargeable Zn-air batteries are considered promising energy storage devices due to their high energy and power density, safety, and cost-effectiveness. However, the sluggish kinetics of the oxygen reaction during discharge and charge processes have hindered their practical application. In this study, LSFMO nanoparticles synthesized with a modified coprecipitation method exhibited high intrinsic activities. Furthermore, the synergic covalent coupling between N/S dual-doped reduced graphene and LSFMO significantly improved the oxygen reduction and evolution reaction capabilities of the LSFMO@NS-RGO hybrid material. The excellent results demonstrated that LSFMO@NS-RGO represents a new class of promising bifunctional catalysts for rechargeable Zn-air batteries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Chenghua Wang, Huiyu Huang, Xueyan Sun, Xiaobin Deng, Yuan Lei, Wenbing Hao, Yilun Liu, Xi Chen, Wei Zhao
Summary: In this work, a new electrolyte design using a polydentate ligand to stabilize the zinc ion and triethanolamine (TEA) as an anionic surfactant is proposed, which greatly suppresses the passivation film formation and improves the efficiency of the zinc anode. The experimental results show that the specific capacity of the battery with the effect of TEA is significantly improved compared to the traditional electrolyte, and the zinc anode self-corrosion is mitigated. The density functional theory calculations confirm the existence and structure of the new complex in electrolytes.
Article
Green & Sustainable Science & Technology
H. Tian, L. Zhu, J. Ni, T. Wei, P. Wang, H. Xiao, X. Chen
Summary: Growing evidence suggests that even a low CO2 concentration of 1000 ppm can pose direct health risks to humans, which is often exceeded in many indoor environments. To address this issue, we developed a CO2 purification module using a moisture swing sorbent and integrated it with existing air conditioning units. The sorbent can spontaneously bind and release CO2 from the air, depending on the moisture level, making it an ideal solution for indoor carbon capture. Tests in simulated indoor environments and an actual office demonstrated the effectiveness of the purification module in maintaining healthy CO2 levels. This decentralized carbon capture facility has the potential to contribute to negative emissions and mitigate the global warming and climate change crisis.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Physical
Huiying Tian, Ziyi Shui, Liangliang Zhu, Xi Chen
Summary: Fe/Ni-N-C materials were successfully constructed and evaluated in a typical H cell, showing a highest CO Faradaic efficiency of 92.9% and a largest turnover frequency of 10.77 x 103 h-1 at - 0.677 V vs. RHE. When transferred to a larger-scale continuous flow cell, Fe/Ni-N-C exhibited higher current density and FECO with robust durability, preserving over 89% of FECO after 40 hours of electrolysis. The synergetic effects of binary metals effectively enhanced the charge transfer rate and provided favorable kinetics. Furthermore, an aqueous Zn-CO2 battery assembled with Fe/Ni-N-C as the cathode demonstrated excellent charge-discharge cycle stability, serving as the electricity supply for ECR.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Chemistry, Physical
Chao Lu, Xi Chen
Summary: Lithium-ion batteries face challenges such as dendrite effect and insufficient ion kinetics, resulting in low efficiency and poor cycling performance. Bio-inspired structures, with characteristics like large surface area, numerous active sites, and ion channels, can improve battery performance. This article summarizes typical bio-inspired structures for lithium-ion batteries and discusses their influence on battery performance. Through theoretical analysis and experimental experience, the design requirements for bio-inspired structures are highlighted to enable battery devices with high power density and stable cycling life. Finally, perspectives on existing issues in the field are provided for future directions.