scholarly journals Feasibility study on microwave welding of thermoplastic using multiwalled carbon nanotubes as susceptor

2021 ◽  
Vol 11 ◽  
pp. 184798042110029
Author(s):  
Phey Yee Foong ◽  
Chun Hong Voon ◽  
Bee Ying Lim ◽  
Mohd Khairuddin Md Arshad ◽  
Subash CB Gopinath ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotubes ◽  
Joint Strength ◽  
Multiwalled Carbon Nanotube ◽  
Joint Interface ◽  
Electron Microscopic ◽  
Multiwalled Carbon ◽  
Heating Duration ◽  
Scanning Electron

Despite manufacturers’ goal of molding single component products from plastics, the structures of some of the products are far too complex to be molded as a single piece. Therefore, assembly of subcomponents into the final products is important for the manufacturing of many plastic-based products. To date, welding is the most efficient joining method for plastics. In this study, multiwalled carbon nanotubes were proposed as the susceptor for the microwave welding of high-density polyethylene considering multiwalled carbon nanotube is a good microwave absorber. multiwalled carbon nanotubes were first dispersed in ethanol in an ultrasonic bath to obtain a homogeneous dispersion. Multiwalled carbon nanotubes dispersion was dropped on the targeted area of the prepared dumbbell-shaped sample and dried in an oven at 45°C for 30 min. The sample was then subjected to 800 W microwave irradiation in the domestic microwave oven. The strength of the weld was tested by using tensile testing. Besides, the cross section of the welded joint was characterized by using scanning electron microscopy. The effect of microwave heating duration and the multiwalled carbon nanotube concentration in the dispersion were studied. It was found that the joint strength increased as the heating duration increase from 2 s to 8 s but decreased when the heating duration was further extended to 10 s. Scanning electron microscopic images showed that voids were formed at the joint interface when 10 s was used and resulted in the lowering of joint strength. In the study of the effect of the multiwalled carbon nanotube concentration in the dispersion, joint strength increased when the multiwalled carbon nanotubes concentration increased from 0.25 wt% to 0.75 wt%. However, the joint strength of sample with 1.00 wt% multiwalled carbon nanotube concentration decreased. The presence of a thick unwelded multiwalled carbon nanotubes layer at the joint interface for sample with 1.00 wt% multiwalled carbon nanotubes concentration as shown in scanning electron microscopic image was believed to cause the lowering of joint strength.

scholarly journals Autonomous self-healing multiwalled carbon nanotube nanocomposites with piezoresistive effect

RSC Advances ◽  
2017 ◽  
Vol 7 (33) ◽  
pp. 20422-20429 ◽  
Author(s):  
Tongfei Wu ◽  
Biqiong Chen
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon Nanotube ◽  
Self Healing ◽  
Multiwalled Carbon ◽  
Piezoresistive Effect

Viscoelastic rubber reinforced by multiwalled carbon nanotubes exhibited rapid, autonomous, mechanically and electrically self-healing properties and piezoresistive behavior.

Soft approach hydrothermal synthesis of a 3D sulfur/graphene/ multiwalled carbon nanotube cathode for lithium–sulfur batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78994-78998 ◽  
Author(s):  
Maru Dessie Walle ◽  
Zhifeng Zhang ◽  
Xiaolong You ◽  
Mengyuan Zhang ◽  
Johnny Muya Chabu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

3D sulfur/graphene/multiwalled carbon nanotubes prepared by a hydrothermal method are used as a cathode for lithium–sulfur batteries.

scholarly journals Primary culture macrophages from fish as potential experimental model in toxicity studies with multiwalled carbon nanotubes

2021 ◽  
Vol 43 ◽  
pp. e52612
Author(s):  
Isabella Ferreira Silva ◽  
Letícia Fagundes Papa ◽  
Pedro Gontijo Carneiro ◽  
Mariane Cristina Schnitzler ◽  
Silmara Nunes Andrade ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Primary Culture ◽  
Experimental Model ◽  
Multiwalled Carbon Nanotubes ◽  
Aquatic Environment ◽  
Multiwalled Carbon Nanotube ◽  
Control Group ◽  
Multiwalled Carbon ◽  
Phagocytosis Activity

Multiwalled carbon nanotube (MWCNT) has been broadly used in several sectors of society. This material when exposed to the environment might reach the aquatic animals and cause toxic effects. Here, it was evaluated the MWCNTs toxicity in melanomacrophages primary culture that was submitted to 1 µ gm L-1 MWCNTs for 24 hours. After exposition to MWCNT, 48 and 59% liver and spleen melanomacrophages were healthy, respectively. The control group presented 85% viability. Phagocytosis activity of melanomacrophages was observed by presence of black inclusions in cytoplasm. The findings indicate MWCNT was cytotoxic to melanomacrophages, where its release and effect into aquatic environment must be more studied. Finally, the melanomacrophages present large potential as experimental model for evaluation of carbon-based nanomaterial toxicity.

scholarly journals Highly selective isomerization of cottonseed oil into conjugated linoleic acid catalyzed by multiwalled carbon nanotube supported ruthenium

RSC Advances ◽  
2019 ◽  
Vol 9 (36) ◽  
pp. 20698-20705
Author(s):  
Shulai Liu ◽  
Bokai Yu ◽  
Zegao Wang ◽  
Jie Hu ◽  
Mingwen Fu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Linoleic Acid ◽  
Carbon Nanotube ◽  
Conjugated Linoleic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Cottonseed Oil ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Efficient Catalyst ◽  
Acid Catalyzed

Ruthenium supported on multiwalled carbon nanotubes is a highly efficient catalyst for the linoleic acid conjugation of cottonseed oil.

Buckling Analysis of Multiwalled Carbon Nanotubes Under Torsional Load Coupling With Temperature Change

2005 ◽  
Vol 128 (3) ◽  
pp. 419-427 ◽  
Author(s):  
Xiaohu Yao ◽  
Qiang Han
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Thermal Effect ◽  
Temperature Change ◽  
Multiwalled Carbon Nanotubes ◽  
Thermal Environment ◽  
Multiwalled Carbon Nanotube ◽  
Wave Number ◽  
Multiwalled Carbon ◽  
Torsional Load

The buckling of multiwalled carbon nanotubes under torsional load coupling with temperature change is researched. The effects of torsional load, temperature change, surrounding elastic medium, and van der Waals forces between the inner and outer nanotubes are taken into account at the same time. Using continuum mechanics, an elastic multishell model with thermal effect is presented for buckling of a multiwalled carbon nanotube embedded in an elastic matrix under thermal environment and torsional load. Based on the model, numerical results for the general case are obtained for the thermal effect on buckling of a multiwalled carbon nanotube under torsional load. It is shown that the buckling torque of a multiwalled carbon nanotube under a certain value of temperature change is dependent on the wave number of torsional buckling modes, and a conclusion is drawn that at room or lower temperature the critical torsional load for infinitesimal buckling of a multiwalled carbon nanotube increases as the value of temperature change increases, while at temperature higher than room temperature the critical torsional load for infinitesimal buckling of a multiwalled carbon nanotube decreases as the value of temperature change increases.

scholarly journals Resistance-strain sensitive rubber composites filled by multiwalled carbon nanotubes for structuraldeformation monitoring

2021 ◽  
Vol 11 ◽  
pp. 184798042110113
Author(s):  
Xingyao Liu ◽  
Rongxin Guo ◽  
Zhiwei Lin ◽  
Yang Yang ◽  
Haiting Xia ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Natural Rubber ◽  
Multiwalled Carbon Nanotubes ◽  
Resistance Strain ◽  
Multiwalled Carbon Nanotube ◽  
Strain Response ◽  
Rubber Composites ◽  
Multiwalled Carbon ◽  
Carbon Nanotube Networks

In this article, multiwalled carbon nanotube/natural rubber composites with resistance-strain sensitivity were prepared by solution method, when the electrical percolation threshold of multiwalled carbon nanotube is only ∼3.5 wt%. The mechanical properties and resistance-strain response sensitivity were studied and analyzed systematically. The dispersion of multiwalled carbon nanotubes in the natural rubber matrix was characterized by field-emission scanning electron microscope and X-ray diffractometer. The composite exhibits good deformation sensitivity (gauge factor >27), large strain sensing range (>200%), and high signal stability when multiwalled carbon nanotube content was appropriate. The composite is suited to application in strain monitoring of large deformation structures since the resistance-strain response is more stable when strain exceeds 100%. To understand the mechanism of the resistance-strain response, the ‘shoulder peak’ of resistance-strain curve was researched and explained by the digital image correlation method, and an analytical model was developed when considering the effects of electronic tunneling and hopping in multiwalled carbon nanotube networks. Both experiment and analytical results confirm the break-restructure process of multiwalled carbon nanotube networks under applied strain cause the resistance-strain response. Finally, the practical application of the composite to monitoring strain load of rubber isolation bearing was realized.

Pretreated multiwalled carbon nanotube adsorbents with amine-grafting for removal of carbon dioxide in confined spaces

RSC Advances ◽  
2014 ◽  
Vol 4 (99) ◽  
pp. 56224-56234 ◽  
Author(s):  
Bin Yang ◽  
Huirong Hu ◽  
Qingni Yu ◽  
Xingwang Zhang ◽  
Zhongjian Li ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Thermal Treatment ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Confined Spaces ◽  
Amine Grafting

Three different methods, including thermal treatment, treatment with HNO3 and O2 oxidation, were used to pretreat multiwalled carbon nanotubes (MWCNTs) before grafting with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPS).

Mechanical properties, wear behavior and crystallographic texture of Al–multiwalled carbon nanotube composites developed by powder metallurgy route

2016 ◽  
Vol 51 (8) ◽  
pp. 1099-1117 ◽  
Author(s):  
Lailesh Kumar ◽  
Syed Nasimul Alam ◽  
Santosh Kumar Sahoo
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotubes ◽  
Crystallographic Texture ◽  
Wear Behavior ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
Al Matrix

Aluminum (Al)-based metal matrix composites reinforced with multiwalled carbon nanotubes were developed by powder metallurgy route. The Al and multiwalled carbon nanotubes powder mixtures were consolidated under a load of 565 MPa followed by sintering at 550℃ for 2 h in inert atmosphere. Al–1, 2, and 3 wt.% multiwalled carbon nanotube composites were developed. In the present study, the microstructure, mechanical properties, sliding wear behavior, and crystallographic texture of various Al–multiwalled carbon nanotube composites were investigated. The multiwalled carbon nanotubes produced by low-pressure chemical vapor deposition technique and the various sintered composites were characterized using scanning electron microscope, high-resolution transmission electron microscope, X-ray diffraction, differential scanning calorimetry and thermogravimetric analysis, Raman spectroscopy, and Fourier transform infrared spectroscopy. A significant improvement in relative density, Vickers microhardness, and wear resistance of the composites up to addition of 2 wt.% of multiwalled carbon nanotubes was observed. The deterioration in these properties beyond 2 wt.% of multiwalled carbon nanotubes was possibly due to the agglomeration of multiwalled carbon nanotubes in the Al matrix. The tensile strength of Al–multiwalled carbon nanotube composites continuously decreases with the addition of multiwalled carbon nanotubes. The decrease in tensile strength can be attributed to the detrimental effect of Al4C3 formed at the interface of the Al matrix and the multiwalled carbon nanotubes which will cause premature failure of the composite. The addition of multiwalled carbon nanotubes altered the crystallographic texture of the composites. The residual stresses in the various composites were found to be compressive in nature and also show improvement up to addition of 2 wt.% multiwalled carbon nanotubes in the Al matrix.

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