i disperse them in 1% SDS, then attached a heterobifunctional linker that contains a phospholipid at one end and a maleimide group to react w/ cysteine residues on proteins or peptides. you can just block the maleimide w/ L-cysteine if you do not want it to react. dialyze away the SDS using deionized water

You can try adding ~1 % Pluronic F108 - manufactured by BASF. The use of a probe sonicator is needed, too.

You can try a common surfactant like gum arabic. Usually gum arabic and carbon nanotubes solutions need to be sonicated for a while (~ 1 hr) to obtain the desired dispersion.

May be it is posible to use some acids and surfactant.

Without chemical modification it will very difficult or impossible to obtain a good aqueous dispersion at such a high concentration. Even 1 % is critical. For chemical modification there were some contributions in recent threads about nanotubes at Researchgate.

Only an idea, not tested yet. You may start with an organic water miscible solvent and solvent exchange with water as a second step. Maybe this works in combination with chemical modification.

You cannot disperse CNTs with such a heavy weight percentage in water directly. You can try the dispersion of CNTs by adding one nd half ml of 2 MET in water and then go for sonication for 2 hr. Hopefully then you can get the dispersion,

Ultrasonication is the one route to disperse carbon nanotubes in the water.

Sonication! If needed add few drops of acetic acid.

i my self for my thesis, dispers cnt in DMF and then use planetary mill about 1 hour to dispers carbon nao tube.i think yhis method is more useful than ultrasonic!

can you clear me your idea about DMF

Add Ethylene glycol , water and CNT's in suitable stiochometric ratio ............

DMF this abbreviation of "dimethylformadie"

instead of water i use this

Which type of instrument u used , inspite of ultrasoncation? Sir please tell me...

You can try surfactants "Investigation of Sodium Dodecyl Benzene Sulphonate Assisted Dispersion and Debundling of Single Wall Carbon Nanotubes." Priya Baskar Rao, Hugh J. Byrne, Journal of Physical Chemistry C, 12, 332-337 (2008), but in general be very careful of sonication "Ultrasound-Assisted SWNTs Dispersion: Effects of Sonication Parameters and Solvent Properties",

Qiaohuan Cheng, Sourabhi Debnath, Elizabeth Gregan and Hugh J. Byrne,

J. Phys. Chem. C, 114, 8821-8827 (2010)

Not sure about how it works in water, but you can look into sonication methods.

I suggest to use surfactant as well in your solution. SDS, SDBS, gum arabic and polycarboxylate are four surfactant can help the dispersion in water.

Sonication is very good. You also can use Pluronic® F-127 that help the dispersion of CNTs in culture medium. It has been used in some good works

Please sir tell me exact quantity of mwcnts in sds sol. And exact time of dispersion in sonication bath.

Quantity is depend upon the wt % of dispersion

mean one can make 5% then ~90-95 part water 5 part MCNT and 0-5 part Surfactant or dispersing agent...

I use planetary mill

Planetary mill what is concept of behind that

I have tried sonication once and it works. but you will loose the aspect ratio. It is possible to get stable suspention of nanotubes in water, however, you must takecare of the energy(power) and time of sonication. You will always get a better dispersion at the expense of some property.

We are still strugelling with 3 % . What is more importand than the load ist the quality of the dispersions and the application your looking for.

We are now at 4% and bit more

can i use magnetic stirrer for disperse CNTs with SDS?