if you want disperse the MWCNT very well. The more the solvent and surfactant , the better. in most case the ratio of surfactant: water = 1-10%.

Thank you Mr Feng...

Yes ,the ratio of 1:10 (w/w) surfactant: water is possible as its over the cmc of SDBS, but this solution may be reach saturation at this concentration. So, I think you could also use for your purpose more dilute surfactant solution of 0.3:10 (w/w) surfactant: water which also over the cmc of SDBS.

could you more explain to me ?

for example if I had 0.5 gr SDBS, How much water I need?

Rabah Khalil: 0.3:10 (w/w) in %??

Sure, through dissolving 3.0928gm of SDBS in water, then diluted by water to 100ml using volumetric flask in order to get 3% (or 0.3:10) w/w SDBS/Water.

Is necessary to put CNT into water too then adding to solution of SDBS? or I can make solution of SDBS then adding CNT to solution as dry powders?

I think you have to make SDBS solution first then you add the powder

hi

i know one who that he worked about this subject :functionalized MWCNTs by surfactant (Sodium dodecyl benzene sulphunat SDBS). she will peresent in next few days.

Mrs. Maminejad. M.s inorganic chemistry ,iran university of science & technology.

It's very well !!!!!!!!! Thank you Mr Akhtar.

What do you mean by surfactant functionalization? Surfactant will be adsorbed. Depending on loading you may increase charge and polarity. In principle surfactant will also adsorb below cmc, however, an entire adsorption layer will only form at equilibrium concentration near cmc. You could determine the adsorption isotherm experimentally at the conditions of dispersion. Keep in mind surface of MWCNT exposed will very much depend on dispersion quality effected also by surfactant.

Focus on your target! The surfactant which you add is to use for avoiding the aggregate of CNT. So you need add more surfactant than the data you get from CMC. But you should add not too much amount of surfactant. The real target of yours is to produce CNT material, not surfactant!!! So you need add more surfactant than CMC.