Electrical Property of Carbon Nanotube/PMMA/PVAc Composite Film

2006 ◽  
Vol 11-12 ◽  
pp. 555-558
Author(s):  
Hong Mei Chai ◽  
Dong Lin Zhao ◽  
Zeng Min Shen
Keyword(s):  
Carbon Nanotube ◽  
Composite Film ◽  
Composite Films ◽  
Solution Casting ◽  
Electrical Percolation ◽  
Graphitized Carbon ◽  
Significant Difference ◽  
Conductive Fillers ◽  
Percolation Thresholds ◽  
Better Than

The carbon nanotube/PMMA/PVAc composite film was prepared by solution casting. The carbon nanotube (CNT) and graphitized carbon nanotube (GCNT) were employed as conductive fillers in the composite films. The conductivity of the GCNT/PMMA/PVAc film is better than that of CNT/PMMA/PVAc film. The electrical percolation thresholds were at 5wt% and 2wt% respectively in the CNT/PMMA/PVAc film and GCNT/PMMA/PVAc film. The volume electric resistivities of CNT/PMMA/PVAc and GCNT/PMMA/PVAc composite film are at 0.044⋅m and 0.007⋅m respectively at 15wt% carbon nanotube. The significant difference of resistivity for the both types of composite film was due to different structure and crystallinity of CNT and GCNT.

scholarly journals Mechanical and Electroconductive Properties of Mono- and Bilayer Graphene–Carbon Nanotube Films

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 74 ◽  
Author(s):  
Michael Slepchenkov ◽  
Olga Glukhova
Keyword(s):  
Carbon Nanotube ◽  
Composite Film ◽  
Electrical Resistance ◽  
Composite Films ◽  
Bilayer Film ◽  
Vertical Force ◽  
Covalent Bonds ◽  
Local Stresses ◽  
Axial Stretching ◽  
Tube Distance

This article presents the results of a computer study of electrical conductivity and deformation behavior of new graphene–carbon nanotube (CNT) composite films under bending and stretching. Mono- and bilayer hybrid structures with CNTs (10,0) and (12,0) and an inter-tube distance of 10 and 12 hexagons were considered. It is revealed that elastic deformation is characteristic for mono- and bilayer composite films both in bending and stretching. It is found that, in the case of bending in a direction perpendicular to CNTs, the composite film takes the form of an arc, and, in the case of bending in a direction along CNTs, the composite film exhibits behavior that is characteristic of a beam subjected to bending deformation as a result of exposure to vertical force at its free end. It is shown that mono- and bilayer composite films are more resistant to axial stretching in the direction perpendicular to CNTs. The bilayer composite films with an inter-tube distance of 12 hexagons demonstrate the greatest resistance to stretching in a direction perpendicular to CNTs. It is established that the CNT diameter and the inter-tube distance significantly affect the strength limits of composite films under axial stretching in a direction along CNTs. The composite films with CNT (10,0) and an inter-tube distance of 12 hexagons exhibit the highest resistance to stretching in a direction along CNTs. The calculated distribution of local stresses of the atomic network of deformed mono- and bilayer composite films showed that the maximum stresses fall on atoms forming covalent bonds between graphene and CNT, regardless of the CNT diameter and inter-tube distance. The destruction of covalent bonds occurs at the stress of ~1.8 GPa. It is revealed that the electrical resistance of mono- and bilayer composite films decreases with increasing bending. At the same time, the electrical resistance of a bilayer film is 1.5–2 times less than that of a monolayer film. The lowest electrical resistance is observed for composite films with a CNT (12,0) of metallic conductivity.

scholarly journals Impact of the Incorporation of Nano-Sized Cellulose Formate on the End Quality of Polylactic Acid Composite Film

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Yidong Zhang ◽  
Chao Liu ◽  
Meiyan Wu ◽  
Zhenqiu Li ◽  
Bin Li
Keyword(s):  
Composite Film ◽  
Polylactic Acid ◽  
Composite Films ◽  
Crystallinity Index ◽  
Regenerated Cellulose ◽  
Fundamental Study ◽  
One Step ◽  
Hydrolysis Of ◽  
Better Than

Polylactic acid (PLA) films with good sustainable and biodegradable properties have been increasingly explored recently, while the poor mechanical property of PLA limits its further application. Herein, three kinds of nano-sized cellulose formate (NCF: cellulose nanofibril (CNF), cellulose nanocrystal (CNC), and regenerated cellulose formate (CF)) with different properties were fabricated via a one-step formic acid (FA) hydrolysis of tobacco stalk, and the influence of the properties of NCF with different morphologies, crystallinity index (CrI), and degree of substitution (DS) on the end quality of PLA composite film was systematically compared. Results showed that the PLA/CNC film showed the highest increase (106%) of tensile strength compared to the CNF- and CF-based films, which was induced by the rod-like CNC with higher CrI. PLA/CF film showed the largest increase (50%) of elongation at the break and more even surface, which was due to the stronger interfacial interaction between PLA and the CF with higher DS. Moreover, the degradation property of PLA/CNF film was better than that of other composite films. This fundamental study was very beneficial for the development of high-quality, sustainable packaging as an alternative to petroleum-based products.

Regeneration of carbon nanotube and nanofibre composite film electrode for electrical removal of cupric ions

2010 ◽  
Vol 61 (6) ◽  
pp. 1427-1432 ◽  
Author(s):  
Yankun Zhan ◽  
Haibo Li ◽  
Likun Pan ◽  
Yanping Zhang ◽  
Yiwei Chen ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Composite Film ◽  
Electrode Surface ◽  
Large Scale ◽  
Low Cost ◽  
Short Circuit ◽  
Composite Films ◽  
Film Electrode ◽  
Reverse Voltage ◽  
Regeneration Efficiency

Low cost and large scale carbon nanotube and nanofibre (CNT–CNF) composite films have been fabricated and employed as electrodes for electrosorption of cupric ions. The regeneration of the saturated CNT–CNF film electrode has been investigated. Three methods (short-circuiting, short-circuiting and then reversing voltage, reversing voltage and then short-circuiting) are used for regeneration. The results show that low regeneration efficiency of CNT–CNF film electrode due to electrodeposition of Cu on the electrode surface can be highly improved by regeneration applying reverse voltage combined with short circuit. 93% regeneration efficiency can be achieved when 0.8 V reverse voltage is applied before short-circuiting during regeneration of CNT–CNF film electrode.

Rheological and electrical percolation thresholds of carbon nanotube/polymer nanocomposites

2012 ◽  
Vol 52 (10) ◽  
pp. 2173-2181 ◽  
Author(s):  
Christian Penu ◽  
Guo-Hua Hu ◽  
Amaia Fernandez ◽  
Philippe Marchal ◽  
Lionel Choplin
Keyword(s):  
Carbon Nanotube ◽  
Polymer Nanocomposites ◽  
Electrical Percolation ◽  
Percolation Thresholds

Facile fabrication of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)-coated selenium nanowire/carbon nanotube composite films for flexible thermoelectric applications

2021 ◽  
Author(s):  
Dabin Park ◽  
Minsu Kim ◽  
Jooheon Kim
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Film ◽  
Composite Films ◽  
Multi Walled Carbon Nanotubes ◽  
Facile Fabrication ◽  
Selenium Nanowires ◽  
Carbon Nanotube Composite ◽  
Flexible Thermoelectric ◽  
Walled Carbon Nanotubes

In this study, we synthesized a flexible thermoelectric composite film consisting of poly(3,4-ethylenedioxythiopene)-poly(4-styrenesulfonate)-coated selenium nanowires (PEDOT:PSS-coated Se NWs) and multi-walled carbon nanotubes (MWCNT) via simple solution mixing. The PEDOT:PSS-coated Se...

scholarly journals Interfacial Chemical Effects of Amorphous Zinc Oxide/Graphene

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2481
Author(s):  
Zhuo Zhao ◽  
Fang Fang ◽  
Junsheng Wu ◽  
Xinru Tong ◽  
Yanwen Zhou ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Composite Materials ◽  
Composite Film ◽  
Free Charge Carrier ◽  
Composite Films ◽  
Theoretical Research ◽  
Electrical Performance ◽  
Graphene Composite ◽  
Photoelectric Properties ◽  
Better Than

Research on the preparation and performance of graphene composite materials has become a hotspot due to the excellent electrical and mechanical properties of graphene. Among such composite materials, zinc oxide/graphene (ZnO/graphene) composite films are an active research topic. Therefore, in this study, we used the vacuum thermal evaporation technique at different evaporation voltages to fabricate an amorphous ZnO/graphene composite film on a flexible polyethylene terephthalate (PET). The amorphous ZnO/graphene composite film inherited the great transparency of the graphene within the visible spectrum. Moreover, its electrical properties were better than those of pure ZnO but less than those of graphene, which is not consistent with the original theoretical research (wherein the performance of the composite films was better than that of ZnO film and slightly lower than that of graphene). For example, the bulk free charge carrier concentrations of the composite films (0.13, 1.36, and 0.47 × 1018 cm−3 corresponding to composite films with thicknesses of 40, 75, and 160 nm) were remarkably lower than that of the bare graphene (964 × 1018 cm−3) and better than that of the ZnO (0.10 × 1018 cm−3). The underlying mechanism for the abnormal electrical performance was further demonstrated by X-ray photoelectron spectroscopy (XPS) detection and first-principles calculations. The analysis found that chemical bonds were formed between the oxide (O) of amorphous ZnO and the carbon (C) of graphene and that the transfer of the π electrons was restricted by C=O and C-O-C bonds. Given the above, this study further clarifies the mechanism affecting the photoelectric properties of amorphous composite films.

scholarly journals Functionalized Multiwalled Carbon Nanotube-Reinforced Polyimide Composite Films with Enhanced Mechanical and Thermal Properties

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Min Chao ◽  
Yanming Li ◽  
Guanglei Wu ◽  
Zhenjun Zhou ◽  
Luke Yan
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Composite Film ◽  
Composite Films ◽  
Conductive Filler ◽  
Filler Loading ◽  
Multiwalled Carbon Nanotube ◽  
High Thermal Conductivity ◽  
Mechanical And Thermal Properties ◽  
Multiwalled Carbon

Polyimide- (PI-) based nanocomposites containing the 4,4′-diaminodiphenyl ether- (ODA-) modified multiwalled carbon nanotube (MWCNT) filler were successfully prepared. The PI/MWCNTs-ODA composite films exhibit high thermal conductivity and excellent mechanical property. The optimal value of thermal conductivity of the PI/MWCNTs-ODA composite film is 0.4397 W/mK with 3 wt.% filler loading, increased by 221.89% in comparison with that of the pure PI film. In addition, the tensile strength of the PI/MWCNTs-ODA composite film is 141.48 MPa with 3 wt.% filler loading, increased by 20.74% in comparison with that of the pure PI film. This work develops a new strategy to achieve a good balance between the high thermal conductivity and excellent mechanical properties of polyimide composite films by using functionalized carbon nanotubes as an effective thermal conductive filler.

The Application of PE/Thermochromic Composite Film to Sliced Fresh Pork Tenderloin

2014 ◽  
Vol 513-517 ◽  
pp. 37-40
Author(s):  
Heng Guang Zhang ◽  
Fu Xin Yang ◽  
Ye Lu
Keyword(s):  
Composite Film ◽  
Composite Films ◽  
Functional Materials ◽  
Color Difference ◽  
Low Density Polyethylene ◽  
Pork Meat ◽  
Membrane Performance ◽  
Significant Difference ◽  
Meat Samples

PE/thermochromic composite membrane is a kind of new functional materials which is composited by PE and thermochromic membrane.PE/thermochromic composite films retain the thermochromic membrane performance of changing the color by absorbing the heat. The composite film cannot be dissolved by water because of the structure which PE film is attached to the both sides of thermochromic film.The effect of the composite film and Nylon/low density polyethylene (LDPE) film on quality of fresh pork meat stored were investigated respectively. The treated meat samples were analyzed periodically for color difference. The results indicate that preservation effect of both films has no significant difference when the fresh pork are stored at 3-5°C, but PE/thermochromic composite films has better preservation effect at 30°C in compared to the Nylon/ LDPE. filmsfilms

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