Article
Polymer Science
Stepan V. V. Lomov, Iskander S. S. Akmanov, Qiang Liu, Qi Wu, Sergey G. G. Abaimov
Summary: The temperature dependence of the electrical conductivity/resistivity of CNT networks is observed to be negative, especially for aligned CNTs (A-CNTs). This study investigates the role of three phenomena, namely the temperature dependence of the intrinsic conductivity of CNTs, the tunnelling resistance of their contacts, and thermal expansion of the network, on the temperature coefficient of resistance (TCR). The results show that the TCR of the CNTs themselves is the main factor influencing the TCR of the film, while the TCR of the tunnelling contacts and film thermal expansion have marginal effects.
Article
Mechanics
Mohammad Zahid, Rajneesh Sharma, Atul Ramesh Bhagat, Priyanka Karra
Summary: This paper presents a two-scale method for predicting the effective CTE of 4D-inplane carbon/carbon composite, and experimental validation shows that the predicted behavior of effective CTEs is in good agreement with experimental observations over the entire temperature range.
COMPOSITE STRUCTURES
(2021)
Article
Thermodynamics
Xu-Hao Huang, Nan-ting Yu, Iftikhar Azim, Jue Zhu, Meng-Jing Wu
Summary: In this study, an analytical model based on the classical laminate theory is developed to predict the thermal expansion coefficients of angle-ply laminates. The model is applied to carbon nanotube-reinforced angle ply laminates, and the thermal-vibration behaviors are analyzed. The results provide fundamental understanding and guidelines for designing laminated structures with specific thermal properties.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Muhammad Muslim Rehman, Khubab Shaker, Yasir Nawab
Summary: High-temperature engineering thermoplastic fillers are becoming more popular for improving the toughness of brittle composites, making them suitable for low velocity impact applications. In this study, immiscible PEEK microparticles were introduced into carbon epoxy composites to enhance their toughness. The incorporation of PEEK particles was achieved through vigorous mechanical stirring and wet compression molding. The effectiveness of the PEEK particles was evaluated based on the coefficients of thermal expansion, dynamic mechanical analysis, and thermal conductivity of the composite material.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Computer Science, Interdisciplinary Applications
L. M. Anaya-Jaimes, W. M. Vicente, R. Pavanello
Summary: This work presents a Bi-directional Evolutionary Structural Optimization (BESO) based methodology for designing orthotropic metamaterials with a specific thermal expansion coefficient. The proposed method stabilizes the evolutionary process using material interpolation and numerical strategies and uses the homogenization method to obtain the equivalent thermal expansion properties of the designed materials.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Materials Science, Composites
Yuhuan Yuan, Cong Peng, Tao Sun, Duo Chen, Chang Gao, Shichao Li, Zhanjun Wu
Summary: The study found that the content of particles has the greatest impact on the CTE of the matrix and GTC of the CFRE, with small particle size showing advantages at low particle content. However, this advantage disappears when the content increases to 30%. A high KH560 grafting rate is beneficial for reducing CTE and GTC, especially for large particles.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Hao Wang, Linhong Li, Xianzhe Wei, Xiao Hou, Maohua Li, Xinfeng Wu, Yong Li, Cheng-Te Lin, Nan Jiang, Jinhong Yu
Summary: The epoxy/AF/Al2O3 composite with a high thermal conductivity of 4.1 W/mK and a significant thermal conductivity enhancement of 2097% demonstrates a promising filler structure for thermal conductivity composites. The synergistic effect between the 3D interconnected AF and Al2O3 microparticles plays a critical role in promoting thermal percolation networks and lowering the coefficient of thermal expansion compared to most epoxy-based composites.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Computer Science, Interdisciplinary Applications
Huiwei Chen, Hui Song, Yuanyuan Li, Mehran Safarpour
Summary: This research focuses on the thermal buckling performance of multi-scale hybrid laminated nanocomposite disk under hygro-mechanical loading. The disk is modeled using higher order shear deformation theory and a modified Halpin-Tsai model is proposed to predict its effective properties. Numerical analysis is conducted to investigate the influence of different parameters on the response of the plate, and benchmark solutions for future investigations are also presented.
ENGINEERING WITH COMPUTERS
(2022)
Article
Nanoscience & Nanotechnology
S. Zhao, Y. Zhao, C. Deng, L. Pan
Summary: Carrier mobility and concentration of polycrystalline-amorphous carbon nanocoils (CNCs) were probed for the first time, revealing a significant decrease in carrier concentration with temperature increase. X-ray diffraction characterization attributed this phenomenon to thermal expansion and compression of grains. Additionally, the characteristics of individual CNCs showed variations in carrier mobility and concentration during the growth process.
MATERIALS TODAY NANO
(2022)
Article
Chemistry, Analytical
Imari Walker, Manuel D. Montano, Ronald S. Lankone, D. Howard Fairbrother, P. Lee Ferguson
Summary: Nanoparticles such as carbon nanotubes are added to polymer matrices to enhance properties of plastic nanocomposites. These materials have the potential to release hazardous chemicals into aquatic environments after degradation. Factors such as temperature, pH, and UV light significantly influence the release of chemicals, and increasing carbon nanotube loading can decrease the release of phenolic chemicals.
ENVIRONMENTAL CHEMISTRY
(2021)
Article
Engineering, Environmental
Qiangsheng Sun, Yudi Feng, Jia Guo, Changchun Wang
Summary: Researchers have designed and synthesized a new conformation-switchable curing agent that can control the coefficient of thermal expansion (CTE) of epoxy resins from negative to positive. The agent has been proven effective through theoretical calculations and experimental results, and commercial epoxy resins cured with it exhibit low CTE and improved mechanical properties.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Li Zhou, Kuanyu Liu, Tiebing Yuan, Zhenyu Liu, Quanzhao Wang, Bolv Xiao, Zongyi Ma
Summary: A 3D representative volume element (RVE) model was developed to analyze the effective thermal expansion coefficient (CTE) of carbon nanotube reinforced aluminum (CNT/Al) composites. The orientation and configuration of CNTs were found to significantly influence the CTE of the composites, with parallel orientation and bundled configuration exhibiting the largest constraint effect and lowest CTE, respectively.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Multidisciplinary
Qian Guo, Gang Li, Pengli Zhu, Zhen Xu, Tao Zhao, Rong Sun, Ching-ping Wong
Summary: As electronic devices become smaller and more integrated, the use of nano-sized silica as a reinforcing filler for epoxy resin in electronics packaging industries has become necessary. However, using silica nanoparticles poses challenges in terms of filler dispersion and the balance between rheology and thermal mechanical performance of epoxy nanocomposites. This study introduces a new strategy by using amino-rich branched polyethyleneimine (PEI) polymer molecules through a self-assembly process to address these challenges. The results show a significant decrease in viscosity and an improvement in viscosity stability, as well as a further reduction in CTE compared to silica nanoparticles. This work provides a new direction for developing high-performance epoxy composites for electrical packaging applications and offers insights into the interface-property relationships.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Ewan Fong, Kimmo Koponen, Sadik Omairey, Peter Dunning
Summary: This paper demonstrates the combination of commercial finite-element software and optimization algorithms to explore the design space of thermal-mechanical metamaterials. An Abaqus plugin is developed to automate the application of periodic boundary conditions and compute effective elastic and thermal expansion properties. The software is linked to an optimizer to find optimal trade-offs between thermal and mechanical properties for two different metamaterials. The results provide insights into the range of properties and designs for optimal trade-offs in these metamaterials.
ENGINEERING WITH COMPUTERS
(2023)
Article
Chemistry, Physical
Yunhe Sheng, Chao Li, Jie Wang, Xiaodong Xia, George J. Weng, Yu Su
Summary: In this study, a multiscale model was developed based on effective medium theory to predict the effect of carbon nanotube (CNT) agglomeration on the overall thermal conductivity of CNT-polymer nanocomposites. It was found that the existence of CNT agglomerates can cause a decrease of up to 50% in the overall thermal conductivity of the nanocomposite. Two important parameters for the progressive agglomeration model were identified and their influences on the predicted results were examined.
Article
Engineering, Multidisciplinary
Chetan S. Jarali, Somaraddi R. Basavaraddi, Sharanabasava C. Pilli, S. Raja, Vilas V. Karjinni
INTERNATIONAL JOURNAL FOR MULTISCALE COMPUTATIONAL ENGINEERING
(2015)
Article
Engineering, Biomedical
G. Jerald Maria Antony, Chethan S. Jarali, S. T. Aruna, S. Raja
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2017)
Article
Engineering, Civil
Chetan S. Jarali, M. Madhusudhan, S. Vidhyashankar, Y. Charles Lu
SMART STRUCTURES AND SYSTEMS
(2017)
Article
Engineering, Multidisciplinary
Chetan Shivaputra Jarali, M. Madhusudan, S. Vidyashankar, S. Raja
COMPOSITES PART B-ENGINEERING
(2018)
Article
Engineering, Multidisciplinary
Chetan S. Jarali, Ravishankar N. Chikkangoudar, Subhas F. Patil, S. Raja, Y. Charles Lu, Jacob Fish
INTERNATIONAL JOURNAL FOR MULTISCALE COMPUTATIONAL ENGINEERING
(2019)
Article
Engineering, Civil
S. S. Kadam, V. V. Karjinni, C. S. Jarali
CIVIL ENGINEERING JOURNAL-TEHRAN
(2019)
Article
Materials Science, Multidisciplinary
Chetan S. Jarali, D. Roy Mahapatra
MULTIDISCIPLINE MODELING IN MATERIALS AND STRUCTURES
(2010)
