Article
Chemistry, Physical
Roey Ben David, Adva Ben Yaacov, Baran Eren
Summary: Molecular adsorption of methanol on Cu surfaces was studied in the 90-200 K temperature range using a combination of IR spectroscopy, thermal desorption analysis, and low-energy electron diffraction. The results revealed differences in the H-bonded structures formed on Cu(111), Cu(100), and Cu(110) surfaces, with Cu(111) showing ordered domains at 90 K. Heating to 120-130 K caused significant changes in the IR spectrum of methanol on all surfaces, with Cu(111) exhibiting more stable and ordered structures at low temperatures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Polymer Science
Jing Zhang, Tinghui Yan, Hongli Zhang, Ye Fang, Yuzhong Huang, Jijun Tang, Mingyang He
Summary: Core-shell thermally expandable microspheres were successfully prepared via Pickering suspension polymerization, and the effects of initiator concentration, cross-linking agent concentration, and modified monomer type on the properties of the microspheres were investigated.
EXPRESS POLYMER LETTERS
(2022)
Article
Biochemistry & Molecular Biology
Benxiang Wei, Joseph M. Flitcroft, Jonathan M. Skelton
Summary: This study presents a detailed first-principles modeling study of the thermal transport in framework structures, revealing their lower thermal conductivity compared to bulk Si. The energetics of these structures are determined by differences in lattice energy, while the differences in phonon group velocities and lifetimes contribute to the differences in thermal conductivity.
Article
Polymer Science
Xiaohua Cui, Jiaming Liu, Ending Zhang, Ziyang Gong, Liyan Liang, Jun Shi, Xiaopeng Hao, Jiwen Hu, Mangeng Lu
Summary: In recent years, there has been a great amount of attention on thermally conductive pressure-sensitive adhesive (PSA), but traditional PSAs do not easily lose adhesion properties after UV irradiation or heating. As a design strategy, this study focuses on developing a thermally conductive adhesive with UV-responsive peelability by modifying graphene with acrylic acid and glycidyl methacrylate. The results showed that the novel PSA with UV-responsive peelability exhibited excellent thermal conductivity and a relatively strong peel strength. It has potential applications in certain electronic devices.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Agricultural Engineering
Cui Xu, Xiao Jia, Jun Du, Feng Zhou, Bin Liu, Yamin Deng, Xiulan Huai
Summary: With the rapid development of electronic devices towards miniaturization, light-weight and electrically insulating performance, thermally conductive structural adhesives (TCSAs) have high requirements. Improving heat dissipation capacity and mechanical properties are critical for the application of TCSAs as the interconnected materials between chips and metal substrates.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Review
Polymer Science
Kangkang Tao, Gaohui Sun, Chengcheng Feng, Guangmin Liu, Yahui Li, Rongrong Chen, Jun Wang, Shihui Han
Summary: This review discusses the design of polyimide films with ordered liquid crystalline structures to enhance thermal conduction and reviews the effects of filler type, thermal conduction paths, and interfacial thermal resistances on thermally conductive behavior. It also provides an outlook on the future development of thermally conductive polyimide films.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Halina Gluchowska, Renata Lyszczek, Liliana Mazur, Alexander M. Kirillov
Summary: Two coordination polymers were synthesized using flexible dicarboxylate linkers, resulting in structures with different topologies, including a 3D metal-organic network and a linear chain. The mu(4-) and mu-L2- linkers in the synthesized compounds exhibited different coordination modes, leading to the formation of Co3O4/CoO and NiO as final thermal decomposition products.
Article
Polymer Science
Huan Wei, Haihang Luo, Jing Li, Haojun Fan, Jun Xiang, Yi Chen, Jun Yan
Summary: This study investigated the effect of interfacial tension and viscosity of the polymerization system on the particle size of thermally expandable microspheres (TEMs), and the impact of TEMs particle size on expansion temperature, expansion ratio, and thermal response performance. The results showed that under optimized conditions, TEMs exhibited large particle size and high expansion ratio at 150? and demonstrated sensitive thermal response. Coating a mixture of waterborne polyurethane and TEMs on a synthetic leather base resulted in a new type of suede-like leather that can replace genuine suede leather.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Qirui Yi, Jingyu Li, Runhua Zhang, Erni Ma, Ru Liu
Summary: Small particle diameter thermally expandable microspheres were prepared with varying homogenization speed. The optimized microspheres with small particle diameters showed stable expansion properties in wood, indicating potential for wood impregnation and successful expansion.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jie He, Jinwei Song, Yuanjie Xu, Xuanhe Zhang, Hongtao Zhou, Wenbin Zhang, Yufei Li, Weili Yan, Huijian Ye, Lixin Xu
Summary: Thermally conductive adhesives have been widely studied due to their dual functions in promoting interfacial bonding and thermal transfer. However, most existing strategies are based on non-recyclable irreversible covalent cross-linking resins. In this study, a strategy for in situ production of high-performance, recyclable thermal adhesives from common stocks using a reversibly cross-linkable hyperbranched-star copolymer, HBPE@PSF, was demonstrated. The copolymer, as a stabilizer, facilitated the exfoliation of hexagonal boron nitride (h-BN) to obtain high-quality boron nanosheets (BNNSs). The resultant composite adhesives, formed by combining BNNSs with the copolymer matrix through a solution cast process and cross-linking via the Diels-Alder reaction, showed excellent interfacial bonding, thermal transfer, and recyclability.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Hyun-Seok Choi, Jeong-Hyun Park, Jong-Hee Lee
Summary: This study achieved a highly thermal conductivity of 9.83 Wm(-1)K(-1) by using highly sophisticated blending and dispersion techniques with spherical aluminum nitride fillers. It suggests that these adhesives can be potential candidates for advanced semiconductor packaging processes.
Article
Materials Science, Multidisciplinary
Tomoki Iwama, Yuanyuan Guo, Shoma Handa, Kumi Y. Inoue, Tatsuo Yoshinobu, Fabien Sorin, Hitoshi Shiku
Summary: This study introduces a novel fabrication method for fiber-based cBPE using thermal drawing, demonstrating the preparation and applicability of single-electrode and multielectrode fibers in ECL imaging with a functional rate of 99%. The work establishes a new mass-production approach for cBPE arrays and demonstrates magnified electrochemical imaging using a thermally-drawn electrode array fiber.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Forestry
Carmen-Mihaela Popescu, Nanami Zeniya, Kaoru Endo, Takuma Genkawa, Miyuki Matsuo-Ueda, Eiichi Obataya
Summary: Research has shown that structural changes occur in wood during hydro-thermal treatment, with the amount of water molecules and treatment time influencing these changes. Higher relative humidity and longer treatment times result in more significant modifications. Additionally, a high amount of extractives remain in the wood structure during hydro-thermal treatment, with variations in quantity and composition.
Article
Engineering, Manufacturing
Yeping Xie, Pan Li, Jiahong Tang, Baojie Wei, Wenhua Chen, Pengju Liu, Shuangqiao Yang, Zhuo Zheng
Summary: By utilizing solid-state shearing milling and microwave-assisted sintering, aluminum-plastic packaging waste was efficiently converted into multifunctional composite materials with superior properties, providing a clean and energy-saving solution to environmental pollution.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Chemistry, Multidisciplinary
De-Han Li, Zi-Meng Han, Qian He, Kun-Peng Yang, Wen-Bin Sun, Hao-Cheng Liu, Yu-Xiang Zhao, Zhao-Xiang Liu, Chen-Na-Yan Zong, Huai-Bin Yang, Qing-Fang Guan, Shu-Hong Yu
Summary: Disposable plastic tableware poses threats to the environment and human health. To solve this problem, biodegradable tableware made of nanofiber materials extracted from seaweed is developed. This material has high strength and thermal stability, and can be processed into different shapes of tableware. The overall performance of this tableware is better than commercial plastic, wood-based, and poly(lactic acid) tableware.
ADVANCED MATERIALS
(2023)
Article
Engineering, Chemical
Timo Nonnenmann, R. Beygi, R. J. C. Carbas, L. F. M. da Silva, Andreas Ochsner
Summary: Nowadays, the demand for joining dissimilar materials in the automotive and aerospace industries is increasing due to the replacement of steel with lightweight materials like aluminum. Adhesive bonding is a commonly used method for joining components, but it often results in premature failure due to peak stresses at the overlap edges. This study focused on manufacturing a hybrid weld-bonded joint using Friction-Stir-Spot-Welding (FSSW) to reduce stress concentration at the edges. Tensile shear tests and numerical simulation were performed to analyze the fracture load and interaction between adhesive bond and FSSW. The results showed that bringing FSSW closer to the edge can significantly reduce the detrimental interaction between adhesive bond and FSSW, but the failure load of the hybrid bonded joint was still lower than the adhesive bonded one. Based on these findings, the use of FSSW and AB should be located as far as possible to develop new hybrid joining configurations with high performance.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Automation & Control Systems
Hassan Badparva, Hassan Moslemi Naeini, Mohammad Mehdi Kasaei, Yaghoub Dadgar Asl, Behnam Abbaszadeh, Lucas F. M. da Silva
Summary: Flexible roll forming (FRF) is an innovative process for producing variable cross-section profiles needed in automotive lightweight structures. This paper provides a new understanding of the deformation length in FRF through experimental tests and numerical simulations. The results show that unlike conventional roll forming, the deformation length in FRF varies considerably with maximum and minimum values appearing in the stretching and compression zones respectively. It is recommended to consider the deformation length in the stretching zone when designing the interstand distance. The results also indicate that increasing the forming angle a, flange length F, and yield strength Y, and decreasing thickness t, will increase the deformation length in all regions of a variable cross-section profile.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
F. Ramezani, R. J. C. Carbas, E. A. S. Marques, A. M. Ferreira, L. F. M. da Silva
Summary: Thin-plies are gaining interest for high-performance applications like aerospace, and replacing layers of CFRP with thin-ply in a unidirectional composite laminate can delay delamination. A study on angle-plied composite laminates under out-of-plane tensile loading reveals that they have higher failure load due to the more complex crack path.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Chemistry, Physical
Alireza Akhavan-Safar, Ghasem Eisaabadi Bozchaloei, Shahin Jalali, Reza Beygi, Majid R. Ayatollahi, Lucas F. M. da Silva
Summary: Repeated impact is a common loading condition for bonded joints. However, the behavior of metal-composite bonded joints under repeated impact loads has not been widely studied. This study proposes the use of bi-adhesive technique to improve the durability of composite-metal joints under impact fatigue. Experimental and numerical analyses reveal that the double adhesives technique significantly enhances the impact fatigue life of the joints.
Review
Polymer Science
Catarina S. P. Borges, Shahin Jalali, Panayiotis Tsokanas, Eduardo A. S. Marques, Ricardo J. C. Carbas, Lucas F. M. da Silva
Summary: In recent decades, there has been an increasing need for compliance with environmental standards in various industries. To meet this need, manufacturers have been using more sustainable materials and techniques, such as eco-friendly and recycled materials. Adhesive bonding, a technique heavily reliant on petrochemical products, is now undergoing a paradigm change. Efforts are being made to use natural composites and adhesives, with wood being a promising option due to its strength, stiffness, formability, and durability. Bio-adhesives are also being considered as alternatives for bonding wood or wood-based composites.
Editorial Material
Education, Scientific Disciplines
Lucas F. M. da Silva
INTERNATIONAL JOURNAL OF MECHANICAL ENGINEERING EDUCATION
(2023)
Article
Engineering, Mechanical
Reza Beygi, Majid Zarezadeh Mehrizi, Alireza Akhavan-Safar, Sajjad Mohammadi, Lucas F. M. da Silva
Summary: In this study, a multilayer perceptron artificial neural network was used to model and predict the ultimate tensile strength of the joint between AA2024 and AA7075 aluminum alloys. The process was optimized using a simulated annealing algorithm to achieve the maximum tensile strength. Various defects, such as root kissing bond and unconsolidated banding structures, were detected in the joints, which were dependent on the tool geometry and rotation speed.
Article
Mechanics
D. Santos, A. Akhavan-Safar, R. J. C. Carbas, E. A. S. Marques, S. Wenig, L. F. M. da Silva
Summary: The rate of fatigue crack growth and fatigue threshold energy release rate are crucial parameters for designing adhesive joints for fatigue service. Different testing strategies, constant load control and constant displacement control, can be used to obtain these parameters through fatigue fracture tests. The effect of testing methodology and temperature on the fatigue behavior of adhesives was investigated for a structural polyurethane adhesive used in automotive applications.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
F. V. B. de Castro Lopes, A. Akhavan-Safar, R. J. C. Carbas, E. A. S. Marque, R. Goyal, J. Jennings, L. F. M. da Silva
Summary: Despite prior studies, little has been done to examine the effects of loading mode and test type on the degradation of adhesive/joint properties at high temperatures. This study aimed to investigate if different loading conditions and test types lead to differing rates of degradation. By subjecting an epoxy adhesive to various tests, the results showed that there were significant differences in the rate of degradation between tensile and shear loading conditions. Moreover, the rate of degradation was found to be dependent on the test type.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Polymer Science
Maria J. P. Ribas, Alireza Akhavan-Safar, Nicolas Pigray, Ricardo J. C. Carbas, Eduardo A. S. Marques, Catarina S. P. Borges, Sabine Wenig, Lucas F. M. da Silva
Summary: This study aims to analyze the impact of strain rate and temperature on the mixed-mode fracture characteristics of a polyurethane adhesive. Through mixed-mode bending tests, researchers found that the maximum load supported by the specimen increased with an increasing loading rate when the temperature exceeded the glass transition temperature.
Article
Engineering, Electrical & Electronic
Pedro Pereira, Raul Campilho, Andry Pinto
Summary: Unmanned aerial vehicle (UAV) technology is used for inspection operations in offshore structures. The concept of a four-link parallel platform is proposed to facilitate UAV landings. The platform uses an inverse kinematics approach and a feedback controller to reduce motion. The control system is validated using ROS and Gazebo.
Article
Polymer Science
Beatriz D. Simoes, Eduardo A. S. Marques, Ricardo J. C. Carbas, Steven Maul, P. Stihler, Philipp Weissgraeber, Lucas F. M. da Silva
Summary: The study aims to characterize the viscoelastic and fracture properties of pressure-sensitive adhesives (PSAs) and understand the complex adhesion phenomenon. The results show that adding a new interface between layers has a negative influence on the tensile strength of the adhesive, while a higher crosshead speed significantly increases the same value. In fracture tests, substrate roughness, the number of stacked layers, and the thickness of the PSA were found to decrease the performance of the adhesive.
Article
Engineering, Electrical & Electronic
Eduardo Eiras, Francisco J. G. Silva, Raul D. S. G. Campilho, Rita C. M. Sales-Contini, Andre F. V. Pedroso, Naiara P. V. Sebbe
Summary: The automotive industry requires flexible and efficient production equipment to reduce costs and meet customization demands. This study successfully increased the flexibility and productivity of production equipment through the development of new mechanical concepts and application of automation, reducing setup time and operator risks.
Article
Nanoscience & Nanotechnology
R. Beygi, R. J. C. Carbas, E. A. S. Marques, A. Q. Barbosa, M. M. Kasaei, L. F. M. da Silva
Summary: This study used Friction Stir Welding (FSW) technique to create a clean and uniform Al/Cu interface and investigated the mechanism of pure brittle fracture. The results showed that multilayered fracture, intergranular fracture, and delamination of the Al/Al2Cu interface were all associated with brittle fracture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
