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US 8,865,107 B2Granted
Highly concentrated nano-reinforcement suspensions for cementitious materials and method of reinforcing such materials
AssigneeNorthwestern University
InventorsMark C. Hersam, Jung-Woo T. Seo, Surendra P. Shah, Maria S. Konsta-Gdoutos, Zoi S. Metaxa
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Abstract
Highly concentrated carbon nanotube or other nano-reinforcement suspensions and/or masses are prepared for use as admixtures in cement base materials to make cementitious composite materials.
Claims9
A method for producing reinforced cement-based materials comprising a concentrated suspension of multiwall carbon nanotubes (MWCNTs), comprising the steps of:
- (a) providing a first solution, said first solution comprising water and surfactant;
- (b) creating a second solution by dispersing said MWCNTs in said first solution, wherein said second solution has a first UV-vis-NIR absorbance value, and wherein the concentration of MWCNTs in said second solution is less than or equal to 0.16 weight %;
- (c) creating a third solution by ultracentrifuging said second solution,
- wherein said third solution comprises a concentrated portion and a non-concentrated portion,
- wherein said concentrated portion has a second UV-vis-NIR absorbance value, and said second UV-Vis-NIR absorbance value is between 3.13 and 4.87 times said first UV-vis-NIR absorbance value;
- and
- (d) removing said non-concentrated portion from said third solution to create said concentrated suspension of MWCNTs.
4 more elements
Dependencies are inferred from the claim text.