Characterization and Magnetic Properties of Helical Carbon Nanotubes and Carbon Nanobelts Synthesized in Acetylene Decomposition over Fe−Cu Nanoparticles at 450 °C

2009 ◽  
Vol 113 (36) ◽  
pp. 15934-15940 ◽  
Author(s):  
Xiaosi Qi ◽  
Wei Zhong ◽  
Yu Deng ◽  
Chaktong Au ◽  
Youwei Du
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Cu Nanoparticles ◽  
Helical Carbon Nanotubes

Helical Carbon Nanotubes: Catalytic Particle Size-Dependent Growth and Magnetic Properties

ACS Nano ◽  
2010 ◽  
Vol 4 (1) ◽  
pp. 241-250 ◽  
Author(s):  
Nujiang Tang ◽  
Jianfeng Wen ◽  
Yang Zhang ◽  
Fanxin Liu ◽  
Kuanjiuh Lin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Particle Size ◽  
Magnetic Properties ◽  
Catalytic Particle ◽  
Size Dependent ◽  
Helical Carbon Nanotubes ◽  
Dependent Growth

Synthesis, Photoluminescence, and Magnetic Properties of Nitrogen-Doping Helical Carbon Nanotubes

2011 ◽  
Vol 115 (25) ◽  
pp. 12329-12334 ◽  
Author(s):  
Jianfeng Wen ◽  
Yang Zhang ◽  
Nujiang Tang ◽  
Xiangang Wan ◽  
Zhuhong Xiong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Nitrogen Doping ◽  
Helical Carbon Nanotubes

Synthesis of helical carbon nanotubes, worm-like carbon nanotubes and nanocoils at 450°C and their magnetic properties

Carbon ◽  
2010 ◽  
Vol 48 (2) ◽  
pp. 365-376 ◽  
Author(s):  
Xiaosi Qi ◽  
Wei Zhong ◽  
Yu Deng ◽  
Chaktong Au ◽  
Youwei Du
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Helical Carbon Nanotubes

In situ synthesis of iron-filled nitrogen-doped carbon nanotubes and their magnetic properties

Carbon ◽  
2013 ◽  
Vol 61 ◽  
pp. 647-649 ◽  
Author(s):  
Qingze Jiao ◽  
Liang Hao ◽  
Qingyan Shao ◽  
Yun Zhao
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
In Situ Synthesis ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Purification and magnetic properties of carbon nanotubes

1998 ◽  
Vol 67 (1) ◽  
pp. 23-27 ◽  
Author(s):  
S. Bandow ◽  
S. Asaka ◽  
X. Zhao ◽  
Y. Ando
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties

scholarly journals Fracture toughness of one- and two-dimensional nanoreinforced cement via scratch testing

2021 ◽  
Vol 379 (2203) ◽  
pp. 20200288 ◽  
Author(s):  
Ange-Therese Akono
Keyword(s):  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Cement Industry ◽  
Vertical Force ◽  
Two Dimensional ◽  
Scratch Testing ◽  
Helical Carbon Nanotubes ◽  
Reinforced Cement ◽  
Carbon Based Nanomaterials ◽  
Carbon Based

Cement is the most widely consumed material globally, with the cement industry accounting for 8% of human-caused greenhouse gas emissions. Aiming for cement composites with a reduced carbon footprint, this study investigates the potential of nanomaterials to improve mechanical characteristics. An important question is to increase the fraction of carbon-based nanomaterials within cement matrices while controlling the microstructure and enhancing the mechanical performance. Specifically, this study investigates the fracture response of Portland cement reinforced with one- and two-dimensional carbon-based nanomaterials, such as carbon nanofibres, multiwalled carbon nanotubes, helical carbon nanotubes and graphene oxide nanoplatelets. Novel processing routes are shown to incorporate 0.1–0.5 wt% of nanomaterials into cement using a quadratic distribution of ultrasonic energy. Scratch testing is used to probe the fracture response by pushing a sphero-conical probe against the surface of the material under a linearly increasing vertical force. Fracture toughness is then computed using a nonlinear fracture mechanics model. Nanomaterials are shown to bridge nanoscale air voids, leading to pore refinement, and a decrease in the porosity and the water absorption. An improvement in fracture toughness is observed in cement nanocomposites, with a positive correlation between the fracture toughness and the mass fraction of nanofiller for graphene-reinforced cement. Moreover, for graphene-reinforced cement, the fracture toughness values are in the range of 0.701 to 0.717 MPa m . Thus, this study illustrates the potential of nanomaterials to toughen cement while improving the microstructure and water resistance properties. This article is part of a discussion meeting issue ‘A cracking approach to inventing new tough materials: fracture stranger than friction’.

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