Influence of Surface Characteristics on the Dispersion of Modified Multi-Walled Carbon Nanotubes

2011 ◽  
Vol 236-238 ◽  
pp. 1832-1835 ◽  
Author(s):  
Yan Xuan Ma ◽  
Yu Dong Zheng ◽  
Jian Wu ◽  
Jue Tan ◽  
Wei Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Characteristics ◽  
Vinyl Pyrrolidone ◽  
Acid Oxidation ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Reactive Groups ◽  
Surface Contact Angle ◽  
Multi Walled Carbon Nanotubes ◽  
Poly Vinyl Pyrrolidone ◽  
Walled Carbon Nanotubes

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.

Development of Pd and Pd–Co catalysts supported on multi-walled carbon nanotubes for formic acid oxidation

2010 ◽  
Vol 195 (2) ◽  
pp. 461-465 ◽  
Author(s):  
D. Morales-Acosta ◽  
J. Ledesma-Garcia ◽  
Luis A. Godinez ◽  
H.G. Rodríguez ◽  
L. Álvarez-Contreras ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Formic Acid ◽  
Formic Acid Oxidation ◽  
Acid Oxidation ◽  
Co Catalysts ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Dispersion of Carbon Nanotubes in Cement-Based Composites and Its Influence on the Piezoresistivities of Composites

2009 ◽  
Author(s):  
Baoguo Han ◽  
Xun Yu ◽  
Jinping Ou
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Cement Mortar ◽  
Sodium Dodecyl ◽  
Impulsive Loading ◽  
Repeated Loading ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Dodecylbenzene Sulfonate ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (NaDDBS) are used as surfactants to improve the dispersion of multi-walled carbon nanotubes (MWNTs) in cement mortar and fabricate piezoresistive carbon-nanotube/cement mortar composite. The piezoresistivity of carbon-nanotube/cement mortar composite with different content levels of MWNTs and different surfactants were explored under repeated loading and impulsive loading. Experimental results indicate that NaDDBS has higher efficiency than SDS for the dispersion of MWNTs in cement mortar. The response of the electrical resistance of carbon-nanotube/cement mortar composite with NaDDBS to external force is more stable and sensitive than that of carbon-nanotube/cement mortar composite with SDS. These findings indicate that the use of NaDDBS is an effective way for improving the dispersion of MWNTs in cement-based composite and fabricating MWNTs filled cement-based composite with stable and strong piezoresistive response.

scholarly journals Functionalization of single and multi-walled carbon nanotubes by chemical treatment

2019 ◽  
Vol 16 (39) ◽  
pp. 55-63
Author(s):  
Akram Sh. Ahmed
Keyword(s):  
Carbon Nanotubes ◽  
Acid Treatment ◽  
Single Walled Carbon Nanotubes ◽  
Deionized Water ◽  
Acid Oxidation ◽  
Ultrasonic Technique ◽  
Experimental Conditions ◽  
Multi Walled Carbon Nanotubes ◽  
Swcnts And Mwcnts ◽  
Walled Carbon Nanotubes

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.

scholarly journals Surface Adsorption and Replacement of Acid-Oxidized Single-Walled Carbon Nanotubes and Poly(vinyl pyrrolidone) Chains

2007 ◽  
Vol 2007 ◽  
pp. 1-5
Author(s):  
Wei Chen ◽  
Xiaojun Li ◽  
Liming Dai
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Vinyl Pyrrolidone ◽  
Single Walled Carbon ◽  
Atomic Force ◽  
Afm Imaging ◽  
Replacement Process ◽  
Potential Applications ◽  
Poly Vinyl Pyrrolidone ◽  
Walled Carbon Nanotubes

Quartz crystal microbalance (QCM) was used to investigate the adsorption of acid-oxidized single-walled carbon nanotubes (Ox-SWNTs) and poly(vinyl pyrrolidone), PVP. It was found for the first time that Ox-SWNTs adsorbed onto the QCM electrode can be effectively replaced by PVP chains in an aqueous solution. This replacement process was also investigated by atomic force miscroscopic (AFM) imaging, which shows good agreement with the QCM measurements. This study provides powerful tools for fundamental investigation of polymer-nanotube interactions and for controlled design/fabrication of functional polymer-nanotube surfaces for potential applications.

Surface characteristics of Ni catalystic films on growth behavior of multi-walled carbon nanotubes

2008 ◽  
Vol 254 (15) ◽  
pp. 4644-4649 ◽  
Author(s):  
Hoon-Sik Jang ◽  
Sung-Oong Kang ◽  
Seung-Hoon Nahm ◽  
Bae Ho Park ◽  
Yong-Il Kim
Keyword(s):  
Carbon Nanotubes ◽  
Surface Characteristics ◽  
Growth Behavior ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
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