Carbon nanotube(CNT)/polymer nanocomposites have vast application in industry because of their light mass and high strength. In this work, a cylindrical tube which is made up of functionally graded(FG) PmP V/CNT nanoc...Carbon nanotube(CNT)/polymer nanocomposites have vast application in industry because of their light mass and high strength. In this work, a cylindrical tube which is made up of functionally graded(FG) PmP V/CNT nanocomposite, is optimally designed for the purpose of torque transmission. The main confining parameters of a rotating shaft in torque transmission process are mass of the shaft, critical speed of rotation and critical buckling torque. It is required to solve a multi-objective optimization problem(MOP) to consider these three targets simultaneously in the process of design. The three-objective optimization problem for this case is defined and solved using a hybrid method of FEM and modified non-dominated sorting genetic algorithm(NSGA-II), by coupling two softwares, MATLAB and ABAQUS. Optimization process provides a set of non-dominated optimal design vectors. Then, two methods, nearest to ideal point(NIP) and technique for ordering preferences by similarity to ideal solution(TOPSIS), are employed to choose trade-off optimum design vectors. Optimum parameters that are obtained from this work are compared with the results of previous studies for similar cylindrical tubes made from composite or a hybrid of aluminum and composite that more than 20% improvement is observed in all of the objective functions.展开更多
Amidst <span><span><span style="font-family:;" "="">the </span></span></span><span><span><span style="font-family:;" "="&...Amidst <span><span><span style="font-family:;" "="">the </span></span></span><span><span><span style="font-family:;" "="">COVID-19 pandemic, environmental problems such as ener<span>gy crisis, global warming, and contamination from pathogenic mi</span>cro-organisms <span>are still prevailed and strongly demanded progress in high</span></span></span></span><span><span><span style="font-family:;" "="">-</span></span></span><span><span><span style="font-family:;" "="">performance</span></span></span><span><span><span style="font-family:;" "=""> energy storing and anti-microbial materials. The nanocomposites are materials <span>that have earned large interest owing to their promising applications for</span> countering global issues related to sustainable energy and</span></span></span><span><span><span style="font-family:;" "=""> a</span></span></span><span><span><span style="font-family:;" "=""> flourishing environ<span>ment. Here, polypyrrole </span></span></span></span><span><span><span style="font-family:;" "="">coated</span></span></span><span><span><span style="font-family:;" "=""> hybrid nanocomposites of multi-walled</span></span></span><span><span><span style="font-family:;" "=""> carbon nanotube and cadmium sulfide quantum dots named MCP were synthe<span>sized using facile and low-cost <i>in-situ</i> oxidative polymerization method.</span> Cha<span>racterization techniques confirmed the synthesis. Electrochemical studies</span> showed that the nanocomposite <span>1-MCP<i> </i></span>showed an impressively higher super capacitance behavior in comparison to f-MWCNT, 7-MCP and 5-MCP. The improved performance of the nanocomposites was attributed mainly to the good conductivity of carbon nanotubes and polypyrrole, high surface area, and stability of the carbon nanotubes and the high electrocatalytic activity of the cadmium sulfide quantum dots. Owing to the synergistic effect of MWCNT, <span>CdS, and PPy the synthesized ternary nanocomposite also inhibited the</span> growth and multiplication of tested bacteria such as <i>S. aureus</i>, and <i>E. coli</i> completely within 24 h. On the whole, the assimilated nanocomposite MCP opens promising aspects for the development of upcoming energy storage devices and as<span style="color:red;"> </span></span></span></span><span><span><span style="font-family:;" "="">an </span></span></span><span><span><span style="font-family:;" "="">antibacterial agent.</span></span></span>展开更多
A polymer-based carbon nano-tubes (CNTs) composite with high electromagnetic (EM) wave shielding effectiveness (SE) and with high mechanical property is developed for packaging of electronic modulus or devices.The ...A polymer-based carbon nano-tubes (CNTs) composite with high electromagnetic (EM) wave shielding effectiveness (SE) and with high mechanical property is developed for packaging of electronic modulus or devices.The liquid crystal polymers (LCP) and melamine formaldehydes (MF) polymer are used to study the orientation effect of CNTs in various polymeric matrix.The influences of orientation,aspect ratio,and mass fraction of CNTs upon the shielding effectiveness (SE) of CNTs-composites are investigated.The higher the orientation,aspect ratio,and weight percentages of nano-materials are, the higher the SE of the carbon composites.The highest SE for the CNTs/LCP nano composite obtained is more than 62 dB. This results may lead to the developing for CPU IC chip packaging.展开更多
文摘Carbon nanotube(CNT)/polymer nanocomposites have vast application in industry because of their light mass and high strength. In this work, a cylindrical tube which is made up of functionally graded(FG) PmP V/CNT nanocomposite, is optimally designed for the purpose of torque transmission. The main confining parameters of a rotating shaft in torque transmission process are mass of the shaft, critical speed of rotation and critical buckling torque. It is required to solve a multi-objective optimization problem(MOP) to consider these three targets simultaneously in the process of design. The three-objective optimization problem for this case is defined and solved using a hybrid method of FEM and modified non-dominated sorting genetic algorithm(NSGA-II), by coupling two softwares, MATLAB and ABAQUS. Optimization process provides a set of non-dominated optimal design vectors. Then, two methods, nearest to ideal point(NIP) and technique for ordering preferences by similarity to ideal solution(TOPSIS), are employed to choose trade-off optimum design vectors. Optimum parameters that are obtained from this work are compared with the results of previous studies for similar cylindrical tubes made from composite or a hybrid of aluminum and composite that more than 20% improvement is observed in all of the objective functions.
文摘Amidst <span><span><span style="font-family:;" "="">the </span></span></span><span><span><span style="font-family:;" "="">COVID-19 pandemic, environmental problems such as ener<span>gy crisis, global warming, and contamination from pathogenic mi</span>cro-organisms <span>are still prevailed and strongly demanded progress in high</span></span></span></span><span><span><span style="font-family:;" "="">-</span></span></span><span><span><span style="font-family:;" "="">performance</span></span></span><span><span><span style="font-family:;" "=""> energy storing and anti-microbial materials. The nanocomposites are materials <span>that have earned large interest owing to their promising applications for</span> countering global issues related to sustainable energy and</span></span></span><span><span><span style="font-family:;" "=""> a</span></span></span><span><span><span style="font-family:;" "=""> flourishing environ<span>ment. Here, polypyrrole </span></span></span></span><span><span><span style="font-family:;" "="">coated</span></span></span><span><span><span style="font-family:;" "=""> hybrid nanocomposites of multi-walled</span></span></span><span><span><span style="font-family:;" "=""> carbon nanotube and cadmium sulfide quantum dots named MCP were synthe<span>sized using facile and low-cost <i>in-situ</i> oxidative polymerization method.</span> Cha<span>racterization techniques confirmed the synthesis. Electrochemical studies</span> showed that the nanocomposite <span>1-MCP<i> </i></span>showed an impressively higher super capacitance behavior in comparison to f-MWCNT, 7-MCP and 5-MCP. The improved performance of the nanocomposites was attributed mainly to the good conductivity of carbon nanotubes and polypyrrole, high surface area, and stability of the carbon nanotubes and the high electrocatalytic activity of the cadmium sulfide quantum dots. Owing to the synergistic effect of MWCNT, <span>CdS, and PPy the synthesized ternary nanocomposite also inhibited the</span> growth and multiplication of tested bacteria such as <i>S. aureus</i>, and <i>E. coli</i> completely within 24 h. On the whole, the assimilated nanocomposite MCP opens promising aspects for the development of upcoming energy storage devices and as<span style="color:red;"> </span></span></span></span><span><span><span style="font-family:;" "="">an </span></span></span><span><span><span style="font-family:;" "="">antibacterial agent.</span></span></span>
文摘A polymer-based carbon nano-tubes (CNTs) composite with high electromagnetic (EM) wave shielding effectiveness (SE) and with high mechanical property is developed for packaging of electronic modulus or devices.The liquid crystal polymers (LCP) and melamine formaldehydes (MF) polymer are used to study the orientation effect of CNTs in various polymeric matrix.The influences of orientation,aspect ratio,and mass fraction of CNTs upon the shielding effectiveness (SE) of CNTs-composites are investigated.The higher the orientation,aspect ratio,and weight percentages of nano-materials are, the higher the SE of the carbon composites.The highest SE for the CNTs/LCP nano composite obtained is more than 62 dB. This results may lead to the developing for CPU IC chip packaging.
