Mitigation of the impact of single-walled carbon nanotubes on a freshwater green algae:Pseudokirchneriella subcapitata

2011 ◽  
Vol 6 (2) ◽  
pp. 161-172 ◽  
Author(s):  
Sejin Youn ◽  
Randy Wang ◽  
Jie Gao ◽  
Anna Hovespyan ◽  
Kirk J. Ziegler ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
The Impact

Evaluation of the impact of single-walled carbon nanotubes in an activated sludge wastewater reactor

2008 ◽  
Vol 58 (3) ◽  
pp. 623-628 ◽  
Author(s):  
Y. Yin ◽  
X. Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Activated Sludge ◽  
Single Walled Carbon Nanotubes ◽  
Phase Iii ◽  
Sludge Flocs ◽  
Single Walled Carbon ◽  
Activated Sludge Reactor ◽  
Solids Retention ◽  
Walled Carbon Nanotubes ◽  
The Impact

This paper evaluated the impact of single-walled carbon nanotubes (SWCNTs) on the performance and activated sludge properties in an activated sludge wastewater reactor. The reactor was shock loaded with 270 mg/L of 90% purified SWCNTs after the reactor reached quasi-steady state and the reactor was monitored for 18 days after the shock loading. Various experimental parameters were measured and compared. Overall the addition of SWCNTs did not negatively impact the performance of the activated sludge reactor; on the other hand, SWCNTs improved sludge settleability and sludge dewaterability. The cake solids of the sludge were increased and the activated sludge flocs became less negatively charged. The positive impacts were more significant in Phase II (after running the reactor for one solids retention time, SRT) than that in Phase III (after running for additional 1.5 SRT).

scholarly journals Toxic Effect of Single Walled Carbon Nanotubes Combined with Cadmium to the Crustacean Daphnia magna

2015 ◽  
Vol 42 ◽  
pp. 50-61 ◽  
Author(s):  
Messika Revel ◽  
Michel Fournier ◽  
Christian Gagnon ◽  
Pierre Yves Robidoux
Keyword(s):  
Carbon Nanotubes ◽  
Toxic Effect ◽  
Daphnia Magna ◽  
Single Walled Carbon Nanotubes ◽  
Langmuir Equation ◽  
Batch Experiments ◽  
Cd Toxicity ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
The Impact

The aim of this study was to assess the impact of single-walled carbon nanotubes (SWCNT) on the toxicity of cadmium (Cd) using the crustacean Daphnia magna. LC50 of Cd and SWCNT alone and combined were calculated and compared. Sorption of Cd on SWCNT was also quantified in separate batch experiments. Results showed that the maximum adsorption of Cd onto SWCNT calculated by the Langmuir equation was 24.4 mg kg-1. LC50s for Cd and SWCNT alone were 252.3 µg L-1 and 1400 µg L-1, respectively. In the presence of 500 and 1000 µg L-1 of SWCNT, Cd LC50s were 127.2 and 120.1 µg L-1 respectively. Therefore, Cd toxicity increased when organisms were exposed to both contaminants which indicated that SWCNT induces a synergistic toxic effect on the survival of D. magna. It appears that even if SWCNT had a low adsorption capacity for Cd, toxicity of the metal can be increased. Our study shows the complexity of SWCNT toxicity and how the understanding of their interactions with other contaminants is crucial to determine the consequences of their release into the environment.

scholarly journals Flexible Electrode Formed by Patterned Layers of Single-Walled Carbon Nanotubes for Optoelectronic Applications

2021 ◽  
Vol 2015 (1) ◽  
pp. 012093
Author(s):  
D M Mitin ◽  
A A Vorobyev ◽  
Y S Berdnikov ◽  
S A Raudik ◽  
A M Mozharov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cell Size ◽  
Single Walled Carbon Nanotubes ◽  
Moderate Increase ◽  
Flexible Electrode ◽  
Single Walled Carbon ◽  
Random Character ◽  
Series Of Experiments ◽  
Walled Carbon Nanotubes ◽  
The Impact

Abstract The technology of creating patterned flexible electrodes based on single-walled carbon nanotubes and polydimethylsiloxane was demonstrated in this paper. A series of experiments were carried out to study whether the percolation affects the conductivity of patterned SWCNT layers. It was found that in patterns with the linewidth above 1 μm and the cell size above 50 μm the random character of SWCNT networks may be neglected. The impact of bending on the grid conductivity was studied. We observed a very moderate increase of resistance below 5% under the strain up to 4 %, which is comparable with the previous results for continuous SWCNT layers and shows the improvement in comparison with the previous reports on patterned SWCNT layers.

scholarly journals The unsteady liquid film flow of the carbon nanotubes engine oil nanofluid over a non-linear radially extending surface

2020 ◽  
Vol 24 (2 Part A) ◽  
pp. 951-963 ◽  
Author(s):  
Abdullah Alzahrani ◽  
Malik Ullah ◽  
Taza Gul ◽  
Dumitru Baleanu
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Engine Oil ◽  
Optimal Homotopy Analysis Method ◽  
Multi Wall Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Non Linear ◽  
Walled Carbon Nanotubes ◽  
The Impact

The enhancement of heat transfer through carbon material is the objective of this study. The renowned class of carbon identified as single walled carbon nanotubes and multi walled carbon nanotubes, nanofluid-flow over a non-linear and unstable surface has been explored. The thermophysical properties of the two sorts of carbon nanotube have been implemented from the experimental outputs in the existent literature using engine oil as a base fluid. The viscous dissipation term has also been included in the energy equation improve the heat transfer rate. The thickness of the nanofluid thin layer is kept variable under the influence of the unstable and non-linear stretching of the disk. The elementary governing equations have been transformed into coupled non-linear differential equations. The problem solution is achieved through BVP 2.0 package of the optimal homotopy analysis method. The square residual error for the momentum and thermal boundary-layers up to the 20th order approximations have been obtained. The numerical ND-solve method has been used to validate the he optimal homotopy analysis method results. The impact of the model parameters vs. velocity field and temperature distribution have been shown through graphs and tables. The impact of the physical parameters on the temperature profile and velocity, pitch for both multi wall carbon nanotubes and single walled carbon nanotubes is gained in the range of 0 ? ? ? 4%. From the obtained results it is observed that the single walled carbon nanotubes nanofluids are more efficient to improve the heat transfer phenomena as compared to the multi wall carbon nanotubes.

Dynamic Buckling of Single-Walled Carbon Nanotubes under Axial Impact Loading

2013 ◽  
Vol 444-445 ◽  
pp. 178-182
Author(s):  
Chuan An Xiong ◽  
Wu Gui Jiang
Keyword(s):  
Carbon Nanotubes ◽  
Finite Element ◽  
Stress Wave ◽  
Single Walled Carbon Nanotubes ◽  
Stress Wave Propagation ◽  
Buckling Mode ◽  
Single Walled Carbon ◽  
Finite Element Software ◽  
Walled Carbon Nanotubes ◽  
The Impact

Based on the Budiansky-Roth motion criterion, a thin cylinder shell finite element model is established using the finite element software (ABAQUS) to systemically investigate the dynamic bucking behavior of single-walled carbon nanotubes, which is validated by the molecular dynamic model. It is shown that both the magnitude and duration of the impact load have a great influence on the critical buckling load. By comparing the buckling modes, it can be found that the stress wave propagation plays an important role on the buckling deformation. A local axisymmetrical buckling mode is observed at the beginning and then an asymmetrical buckling mode occurs because of the stress wave superposition.

Purity Evaluation of Single-Walled Carbon Nanotubes Using Thermogravimetric Analysis

2013 ◽  
Vol 51 (2) ◽  
pp. 137-144
Author(s):  
Naesung Lee ◽  
Jeung Choon Goak ◽  
Tae Yang Kim ◽  
Jongwan Jung ◽  
Young-Soo Seo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermogravimetric Analysis ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Purity Evaluation ◽  
Walled Carbon Nanotubes
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