Phase Behavior of DNA-Based Dispersions containing Carbon Nanotubes: Effects of Added Polymers and Ionic Strength on Excluded Volume

2012 ◽  
Vol 116 (18) ◽  
pp. 9888-9894 ◽  
Author(s):  
Franco Tardani ◽  
Camillo La Mesa ◽  
Philippe Poulin ◽  
Maryse Maugey
Keyword(s):  
Carbon Nanotubes ◽  
Ionic Strength ◽  
Phase Behavior ◽  
Excluded Volume

Ionic Strength-Mediated Phase Transitions of Surface-Adsorbed DNA on Single-Walled Carbon Nanotubes

2017 ◽  
Vol 139 (46) ◽  
pp. 16791-16802 ◽  
Author(s):  
Daniel P. Salem ◽  
Xun Gong ◽  
Albert Tianxiang Liu ◽  
Volodymyr B. Koman ◽  
Juyao Dong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Phase Transitions ◽  
Ionic Strength ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Acute Toxicity of Double-Walled Carbon Nanotubes to Three Aquatic Organisms

2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Lungile P. Lukhele ◽  
Bhekie B. Mamba ◽  
Ndeke Musee ◽  
Victor Wepener
Keyword(s):  
Carbon Nanotubes ◽  
Humic Acid ◽  
Ionic Strength ◽  
Acute Toxicity ◽  
Poecilia Reticulata ◽  
Aquatic Organisms ◽  
Trophic Levels ◽  
Pseudokirchneriella Subcapitata ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This study investigated the toxicity of double walled carbon nanotubes (DWCNTs) to three aquatic organisms, namely,Pseudokirchneriella subcapitata,Daphnia pulex, andPoecilia reticulataunder the influence of exposure media properties specifically the ionic strength and organic matter represented by humic acid. Results indicated that ionic strength enhanced DWCNTs agglomeration whilst humic acid stabilized the CNTs and in turn inhibited the formation of aggregates. LC50s forD. pulexwere higher at 2.81 and 4.45 mg/L for pristine and oxidised DWCNTs, respectively; however,P. reticulatahad lower values of 113.64 mg/L and 214.0 mg/L for the same CNTs correspondingly.P. subcapitatahad EC50s of 17.95 mg/L and 10.93 mg/L for the pristine and oxidised DWCNTs, respectively. In the presence of humic acid high DWCNTs acute toxicity towardsD. pulexandP. reticulatawas observed but ionic strength led to opposite effect irrespective of DWCNTs form. Both humic acid and ionic strength shielded theP. subcapitatafrom toxic effects of DWCNTs. Overall, our findings suggest that the toxicity of DWCNTs in the aquatic systems (i) will be dependent on media properties and (ii) is likely to proceed at different rates to organisms at different trophic levels.

Application of oxidized multi-wall carbon nanotubes for Th(IV) adsorption

2007 ◽  
Vol 95 (5) ◽  
Author(s):  
C. L. Chen ◽  
X. L. Li ◽  
X. K. Wang
Keyword(s):  
Carbon Nanotubes ◽  
Ionic Strength ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Promising Candidate ◽  
Multi Wall Carbon Nanotubes ◽  
Mwcnt Concentration ◽  
Pseudo Second Order ◽  
Better Than

Th(IV) adsorption onto oxidized multi-wall carbon nanotubes (MWCNTs) was carried out at 293±2K. The effects of MWCNT concentration, pH, and ionic strength were studied. The results showed that Th(IV) adsorption onto oxidized MWCNTs strongly depended on MWCNT concentration and pH, and was weakly dependent on ionic strength. Oxidized MWCNTs showed a higher Th(IV) adsorption capacity than as-grown MWCNTs. The adsorption process followed pseudo second order kinetics. The Freundlich isotherm model described the data better than the Langmuir model. The adsorption mechanism of Th(IV) may be surface complexation. Oxidized MWCNTs may be a promising candidate for the concentration of Th(IV), or its analogue actinides from large volumes.

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