Physical and chemical surface modification of carbon nanotubes for adsorptive desulfurization of aromatic impurities in diesel fuel

Author(s):  
Amin Kazemi-Beydokhti ◽  
Hassan Hassanpour-souderjani
2015 ◽  
Vol 1107 ◽  
pp. 320-325
Author(s):  
Bryan Gindana ◽  
Arvyvie Abie Jamil ◽  
Brian Brandon Bernard ◽  
Florinna Tan ◽  
M.A. Siti Aishah ◽  
...  

Carbon nanotubes are commonly used to create polymer-nanotube composite for various applications. To suffice the needs of the emerging interest in utilizing nanotube, a great concern in creating a stable dispersion of the nanotube in solvent emerged. There is a paramount need to enhance the adhesion between the polymer and carbon nanotube to give a homogenous and stable dispersion throughout the polymer matrix. Thus, oxidative acid treatments are often chosen to chemically functionalize carbon nanotube in order to give such dispersing ability to the nanomaterials. In this study, purified multi-walled carbon nanotubes (MWCNTs) is oxidized under the influence of three types of oxidants i) hydrogen peroxide, ii) citric acid monohydrate and iii) mixture of 3:1 sulphuric and nitric acid. All the MWCNTs suspensions ultrasonicated for 8 hours to create opening defects on the MWCNTs to allow the surface modification to occur. In this comparative study of chemically surface modification using oxidative acid treatments, FTIR was used to examine the formation of -OH, -COOH and -C=O groups on the surface of the MWCNTs, TGA and XRD used to determine the thermal behaviour and the crystal structure studies of the modified MWCNTs respectively.


2007 ◽  
Vol 123 (1) ◽  
pp. 269-276 ◽  
Author(s):  
HyunMin Choi ◽  
Kyo-in Koo ◽  
Sunkil Park ◽  
Myoung-Jun Jeong ◽  
GilSub Kim ◽  
...  

2003 ◽  
Vol 57 (10) ◽  
pp. 491-499 ◽  
Author(s):  
Dragan Jocic ◽  
Petar Jovancic ◽  
Maja Radetic ◽  
Tatjana Topalovic ◽  
Zoran Petrovic

The modern textile fibre treatments aim to obtain the required level of beneficial effect while attempting to confine the modification to the fibre surface. Recently, much attention has been focused on different physical methods of fibre surface modification, cold plasma treatment being considered as very useful. Moreover, there are efficient chemical methods available, such as peroxide, biopolymer and enzyme treatment. Some interesting combinations of these physical and chemical surface modification methods as means to modify fibre surface topography and thus controlling the surface-related properties of the fibre are presented in this paper. The properties obtained are discussed on the basis of the physico-chemical changes in the surface layer of the fibre, being assessed by wettability and contact angle measurements, as well as by FTIR-ATR and XPS analysis. The SEM and AFM technique are used to assess the changes in the fibre surface topography and to correlate these changes to the effectiveness, uniformity and severity of the textile fibre surface modification treatments.


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