Graphene Aqueous Solution Concentration: Variations and Preparation Methods
The concentration of graphene aqueous solutions can vary depending on the preparation method and application requirements, typically ranging from 0.005 to 10 mg/ml. Below are some examples of graphene solution concentrations in different contexts:
- Single-layer Graphene: In some studies, a concentration of 0.16 g/L has been achieved by gradually adding graphene THF solution dropwise into degassed water and slowly evaporating the organic solvent. This solution can remain stable for several months.
- Graphene Oxide: Aqueous solutions of graphene oxide formed via ultrasonic dispersion typically have concentrations ranging from 0.25 to 1 g/L. Another study reported that the concentration could reach 1 mg/ml. A method involving UV irradiation can increase the concentration by forming negatively charged graphene oxide solutions.
- Other Cases: When graphene powder is diluted in water, the concentration can be as low as 0.005 mg/ml. In certain experimental conditions, the maximum concentration of a graphene suspension can reach 0.3 mg/ml.
- High-Concentration Solutions: High-pressure homogenization and liquid-phase exfoliation can produce high-concentration graphene dispersions, with concentrations exceeding 10 mg/ml.
In summary, the concentration of graphene aqueous solutions can vary widely, from 0.005 to over 10 mg/ml, depending on the preparation methods and specific needs. These data reflect the dispersibility and stability of different types of graphene under various conditions.
Source: Graphene Yellow Pages