scholarly journals The Effect of DNA and Sodium Cholate Dispersed Single-Walled Carbon Nanotubes on the Green Algae Chlamydomonas reinhardtii

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Ryan M. Williams ◽  
Hannah K. Taylor ◽  
Jackson Thomas ◽  
Zachary Cox ◽  
Bridget D. Dolash ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chlamydomonas Reinhardtii ◽  
Chlorophyll Content ◽  
Green Algae ◽  
Single Walled Carbon Nanotubes ◽  
Sodium Cholate ◽  
Model Organisms ◽  
Growth And Survival ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Increasing use of single-walled carbon nanotubes (SWCNTs) will lead to their increased release into the environment. Previous work has shown negative effects of SWCNT on growth and survival of model organisms. The aim of the current study was to determine the effect of SWCNT well-dispersed by either DNA or sodium cholate (SC) on the unicellular green algae Chlamydomonas reinhardtii in stagnant water conditions. Growth measurements were taken up to ten days for algae treated with varied levels of DNA:SWCNT or SC:SWCNT or controls, and chlorophyll content after 10 days was determined. Results show no effect on either growth or chlorophyll content of algae at any concentration or duration. This is in contradiction to prior work showing toxicity of SWCNT to environmental model organisms.

scholarly journals Antimicrobial Activity of Single-Walled Carbon Nanotubes Suspended in Different Surfactants

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Lifeng Dong ◽  
Alex Henderson ◽  
Christopher Field
Keyword(s):  
Carbon Nanotubes ◽  
Antibacterial Activity ◽  
Sodium Dodecyl ◽  
Growth Curves ◽  
Single Walled Carbon Nanotubes ◽  
Sodium Cholate ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Bacterial Strains ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

We investigated the antibacterial activity of single-walled carbon nanotubes (SWCNTs) dispersed in surfactant solutions of sodium cholate, sodium dodecylbenzene sulfonate, and sodium dodecyl sulfate. Among the three surfactants, sodium cholate demonstrated the weakest antibacterial activity againstSalmonella enterica,Escherichia coli, andEnterococcus faeciumand thereby was used to disperse bundled SWCNTs in order to study nanotube antibiotic activity. SWCNTs exhibited antibacterial characteristics for bothS. entericaandE. coli. With the increase of nanotube concentrations from 0.3 mg/mL to 1.5 mg/mL, the growth curves had plateaus at lower absorbance values whereas the absorbance value was not obviously affected by the incubation ranging from 5 min to 2 h. Our findings indicate that carbon nanotubes could become an effective alternative to antibiotics in dealing with drug-resistant and multidrug-resistant bacterial strains because of the physical mode of bactericidal action that SWCNTs display.

Exchange of Oligonucleotide (dC15) on Single-walled Carbon Nanotubes

2012 ◽  
Vol 1407 ◽  
Author(s):  
Yuichi Kato ◽  
Ayaka Inoue ◽  
Naotoshi Nakashima ◽  
Yasuro Niidome
Keyword(s):  
Carbon Nanotubes ◽  
Near Infrared ◽  
Equilibrium Constants ◽  
Single Walled Carbon Nanotubes ◽  
Infrared Region ◽  
Sodium Cholate ◽  
Absorption Bands ◽  
Single Walled Carbon ◽  
Near Infrared Region ◽  
Walled Carbon Nanotubes

ABSTRACTExchange of solubilizers adsorbed on single-walled carbon nanotubes (CNTs) is probed by analysis of the peak shifts of the absorption bands of CNTs in the near-infrared region. Equilibrium constants and thermodynamic parameters of the exchange of sodium cholate for DNA (15-mers of oligo-DNAs, cytosine) on CNTs of different chirality are determined.

Optical absorption spectrum of single-walled carbon nanotubes dispersed in sodium cholate and sodium dodecyl sulfate

2008 ◽  
Vol 23 (3) ◽  
pp. 632-636 ◽  
Author(s):  
Inderpreet Singh ◽  
P.K. Bhatnagar ◽  
P.C. Mathur ◽  
L.M. Bharadwaj
Keyword(s):  
Carbon Nanotubes ◽  
Absorption Spectrum ◽  
Sodium Dodecyl Sulfate ◽  
Near Infrared ◽  
Sodium Dodecyl ◽  
Single Walled Carbon Nanotubes ◽  
Sodium Cholate ◽  
Single Walled Carbon ◽  
Dodecyl Sulfate ◽  
Walled Carbon Nanotubes

Commercially procured single-walled carbon nanotubes were dispersed in 2 wt% solution of sodium cholate and also in 1 wt% solution of sodium dodecyl sulfate. The absorption spectrum of the suspensions was studied in ultraviolet–visible–near-infrared (UV–vis–NIR) range. Two distinct bands, each containing three peaks, were observed in NIR range for both the suspensions. These peaks correspond to transitions between van Hove singularities E11 and E22 in the density of states of the semiconducting nanotubes. Comparing positions of the observed peaks with the empirical Kataura plot, the diameters and chiralities of the nanotubes were estimated. Using tight binding approximations, the diameter of the nanotubes was also estimated theoretically. Discrepancies between the theoretically calculated diameters and those obtained by empirical Kataura plots are found to be higher for E11 peaks. It has been suggested that the reason for this discrepancy is that the observed E11 peaks are blue-shifted due to Coulomb interactions and exciton formation.

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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