How to prepare molar solution of graphene oxide?

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Muhammad Kashif

Dear Dr Mishra

Preparing a molar solution of graphene oxide involves dissolving a known amount of graphene oxide powder in a solvent to achieve a specific concentration in moles per liter (mol/L). Here's a general outline of the steps you can follow:

Materials Needed:

Graphene oxide powder
Solvent (commonly water or another suitable solvent)
Weighing scale
Glass container with a lid (to dissolve and store the solution)
Magnetic stirrer or vortex mixer
Safety equipment (lab coat, gloves, safety goggles)

Procedure:

Safety Precautions: Make sure you are working in a well-ventilated area and follow proper laboratory safety protocols.

Weighing Graphene Oxide: Use a weighing scale to accurately measure the desired amount of graphene oxide powder. This amount will depend on the desired molarity of your solution and the molecular weight of graphene oxide.

Calculating Mass: Use the formula: Mass (grams) = Moles × Molecular Weight

Rearrange the formula to solve for moles: Moles = Mass (grams) / Molecular Weight

Plug in the molecular weight of graphene oxide (which you can find from its chemical formula) and the desired molarity to calculate the mass needed.

Dissolving Graphene Oxide: Place the measured graphene oxide powder in a clean, dry glass container.

Adding Solvent: Add the appropriate volume of solvent (usually water) to the container. The volume of solvent will depend on the desired final volume of your solution. Remember, the final molarity is calculated based on the moles of solute (graphene oxide) divided by the volume of solvent in liters.

Mixing: Stir the mixture using a magnetic stirrer or vortex mixer. Make sure the graphene oxide is well dispersed in the solvent.

Waiting and Mixing: Allow the mixture to stir for some time (several hours or overnight) to ensure the graphene oxide is well dispersed and dissolved.

Adjusting Volume: If necessary, adjust the final volume of the solution by adding more solvent. Make sure to calculate the molarity accordingly.

Final Mixing and Homogenization: Stir the solution one final time to ensure it's well mixed and homogeneous.

Storage: Transfer the solution to a suitable storage container, preferably one with a lid to prevent contamination. Label the container with the concentration and any other relevant information.

Ayushi Mishra

Sir Muhammad Kashif,

what is the molecular weight of Graphene Oxide? Please provide a reference too.

An-Giang Nguyen

What is the definition of the solution? It should be composed of solutes and solvents.

However, graphene oxide doesn't dissolve in solvents such as water. Therefore, I recommend using concentration (in mg/mL)

An-Giang Nguyen Sir, I want to perform Job's plot using a graphene oxide solution. that requires an equimolar solution of GO and ligand. that is why I am searching for its molarity.

Graphene is an insoluble solid with no defined molar mass. So, it’s impossible to calculate its molar concentration.

Muhammad Kashif Nicely copied from chatgpt. if you are a researcher please provide authenticated answers don't just copy paste and spread mis information here.

Titus Sobisch

as pointed out by Giang no solution therefore an invalid question.

https://drive.google.com/file/d/1z7nM0U8vOJ2uKuoDGIZyf07WnWK8xOUo/view?usp=sharing

Géza Horváth-Szabó

I agree with the previous comments on the impracticality of mole concentration for graphene.

Nevertheless, there are some theoretical cases when you want to use molar concentration for insoluble particles. It is not forbidden by thermodynamics.

For these cases, first, you need to know the actual mass [in grams] of a single graphene nanoparticle; second, you need to multiply it with the Avogadro constant to obtain the molar mass of such nanoparticles; third, you need to measure the weight [in grams] of these nanoparticles in one litre of their "solution"; forth, you should divide the latter with the obtained molar mass of the nanoparticles to get the molar concentration.

Comments:

(i) The calculated molar mass will be enormous

(ii) The nanosuspension is better to be monodisperse

(iii) The molar mass of nanoparticles can also be measured by vapour pressure osmometry when it is not too high.