Mapping Experimental and Theoretical Reactivity Descriptors of Fe macrocyclic complexes deposited on Graphite or on Multi Walled Carbon Nanotubes for the Oxidation of Thiols: Thioglycolic Acid Oxidation

2021 ◽  
pp. 138905
Author(s):  
Ricardo A. Matute ◽  
Alejandro Toro-Labbé ◽  
María P. Oyarzún ◽  
Sara Ramirez ◽  
Daniela E. Ortega ◽  
...  
2010 ◽  
Vol 195 (2) ◽  
pp. 461-465 ◽  
Author(s):  
D. Morales-Acosta ◽  
J. Ledesma-Garcia ◽  
Luis A. Godinez ◽  
H.G. Rodríguez ◽  
L. Álvarez-Contreras ◽  
...  

2011 ◽  
Vol 236-238 ◽  
pp. 1832-1835 ◽  
Author(s):  
Yan Xuan Ma ◽  
Yu Dong Zheng ◽  
Jian Wu ◽  
Jue Tan ◽  
Wei Li ◽  
...  

In order to improve the dispersion of multi-walled carbon nanotubes (MWCNTs), MWCNTs were physically modified by the surfactant of Poly (vinyl pyrrolidone) (PVP), cetyl trimethylammonium bromide (CTAB) and sodium dodecylbenzene sulfonate (SDBS), and were chemically treated by the acid oxidation. Measuring the zeta potential of the dispersions of modified MWCNTs and surface contact angle of modified MWCNT powders, influence of acting forces on the dispersions of modified MWCNTs was analyzed. The balance of electrostatic repulsion and van der Waals forces determines the stabilization of aqueous modified MWCNT dispersions. The sufficient reactive groups, ions and long molecular chains play important roles for such balance.


2019 ◽  
Vol 16 (39) ◽  
pp. 55-63
Author(s):  
Akram Sh. Ahmed

In this work we experimentally investigated SWCNTs and MWCNTs to increase their thermal conductivity and electrically functionalization process using different reagents ((nitric acid, HNO3 followed by acid treatment with H2SO4), then washed with deionized water (DW) and then treated with H2O2 via ultrasonic technique. Then repeated the steps with MWCNTs and compare their results in an effort to improve experimental conditions that efficiently differentiate the surface of the single walled carbon nanotubes (SWCNTs) and multi walled carbon nanotubesi(MWCNTs) that less nanotubes destroy and to enhance the properties of them and also to reduce aggregation in liquid. the results were prove by XRD, and infrared spectroscopy (FTIR). The FTIR spectrum shows the presence of carboxylic group after treatment with (acid oxidation and H2O2) and refers to Functionalization (SWCNTs) and (MWCNTs) on the surface wall microscopic images show surface adjustment on SWCNTs and ((MWCNTs)) structure after any treatment. AT last, a fully of SWCNTs and MWCNTSIwere obtained successfully accomplished with the reduction of the collapsed structure.


2018 ◽  
Author(s):  
Shahidah Arina Shamsuddin ◽  
Mohd Nazree Derman ◽  
Jasni Mohamed Ismail ◽  
Nur Hamidah Abdul Halim ◽  
Uda Hashim ◽  
...  

2021 ◽  
Author(s):  
Ashkan Zandi ◽  
Zahra Davari Sh. ◽  
Fatemeh Shojaeian ◽  
S. M. Sadegh Mousavi-kiasary ◽  
Fereshteh Abbasvandi ◽  
...  

A new biosensor for detecting cancer lymph nodes was developed based on the electrochemical tracing of fatty acid oxidation. The sensor needles were decorated with superhydrophobic multi-walled carbon nanotubes using laser irradiation nano-welding.


2016 ◽  
Vol 23 (04) ◽  
pp. 1650025
Author(s):  
ALBERTO G. ALBESA ◽  
MATÍAS RAFTI ◽  
JOSÉ LUIS VICENTE

The effect of wet acid oxidation by means of sulfuric/nitric acid mixtures, and high-temperature treatment of commercial arc-discharge synthesized multi-walled carbon nanotubes (MWCNTs) was studied. In order to analyze the adsorption capacities of differently treated MWCNTs, we employed a multistep method that considers separately different pressure ranges (zones) on the experimentally obtained isotherms. The method is based on simple gas isotherm measurements (N2, CO2, CH4, etc.). Low pressure ranges can be described using Dubinin’s model, while high pressure regimes can be fitted using different models such as BET multilayer and Freundlich equations. This analysis allows to elucidate how different substrate treatments (chemical and thermal) can affect the adsorbate–adsorbent interactions; moreover, theoretical description of adsorbate–adsorbate interactions can be improved if a combination of adsorption mechanisms are used instead of a unique model. The results hereby presented also show that, while MWCNTs are a promising material for storage applications, gas separation applications should carefully consider the effect of wide nanotube size distribution present on samples after activation procedures.


NANO ◽  
2014 ◽  
Vol 09 (08) ◽  
pp. 1450091
Author(s):  
PRIYANKA PANDEY ◽  
SMITA MOHANTY ◽  
SANJAY K. NAYAK

In the present study, a candid approach using mechanical oxidation, for modification of multi-walled carbon nanotubes (CNTs) has been utilized, and its advantages over conventional acid oxidation methods have been established. Higher concentration of acidic groups was found in case of mechanically oxidized CNTs (i.e., McCNT) as compared to acid oxidized CNT (i.e., ACNT). Raman spectrum exhibited greater degree of transformation of sp2 carbon into sp3 carbon. X-ray diffraction (XRD) analysis revealed maintained crystalline organization in McCNT. The major finding of the study was that, the mechanical oxidation method can be used easily to replace the conventional acid treatment method. This is because in the mechanical oxidation crystalline organization of CNTs can be maintained, relatively higher number of acid groups can be incorporated, no loss to the mass of CNTs is allowed etc.


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