Molecules/nm²? what does it mean

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SUMMARY

The discussion centers on converting a measurement of molecules per square nanometer (molecules/nm²) into a molar or mass concentration for applications involving surface coatings. It is established that this measurement pertains to surface area rather than volume, making direct conversion to molar concentration impossible without additional information. To calculate the required amount of a product for coating spherical nanoparticles, one must multiply the surface area of the nanoparticles (calculated using the formula 4πr²) by the density of molecules per unit area. This approach allows for determining the total quantity needed for effective surface coverage.

PREREQUISITES
  • Understanding of surface area calculations, specifically for spheres (4πr²).
  • Familiarity with the concept of molar concentration and its calculation.
  • Knowledge of nanoparticles and their dimensions, particularly in nanometers.
  • Basic principles of solution preparation and mixing for coatings.
NEXT STEPS
  • Learn about calculating surface area for various geometries, including spheres and cylinders.
  • Study the principles of molar concentration and how to convert between different concentration units.
  • Explore methods for preparing solutions for nanoparticle coatings, including concentration calculations.
  • Investigate the properties and applications of spherical nanoparticles in surface chemistry.
USEFUL FOR

This discussion is beneficial for chemists, materials scientists, and researchers involved in nanoparticle applications, particularly those focused on surface coatings and concentration calculations.

nadaben
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Hi everyone

in an article they mentioned that the amount added of a product is given by molecules/nm²
how can i obtain a molar or mass concentration from it ?

best regards
 
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You can't; it is a number of molecules per unit area, not volume. Presumably to do with coating a surface or similar phenomenon. You can convert it to, say, moles/m2 if you want.
 
There is no way to know the amount i can take? cause i should mix it with my solution before deposition..
 
Do you understand how concentrations work in general?

You can calculate amount only if you know the surface which you need to cover. Then you have to decide what volume of solution to use and once you know both amount and volume you can calculate required molar concentration.
 
if i have spherical nanoparticles sized 30nm and i want to cover them with a product with an amount of 0.6 molecule/nm²
how can i know the corresponding quantity that i should take of this product?
is it by multipliying the surface of nanoparticle (4πr²) by 0.6?
 
That's amount per a single nanoparticle, but yes, that's the correct approach.
 
Yes exactly ! Thank u so much for your help
 

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