Ana Paula Martins Leandro

5 Questions 3 Answers 0 Followers

Questions related from Ana Paula Martins Leandro

Why is my graphene oxide turning black instead of yellow-brown?

I've been preparing graphene oxide from modified hummer method using: 10g graphite

11 November 2018 4,153 4 View

How to convert coal char into graphene oxide?

I've trying to perform hummers method to convert coal char into graphene oxide, but the color keeps turning black. I wonder if there's something wrong. Have anyone tried before?

08 August 2018 8,128 4 View

Graphene oxide turned transparent after addition of H2O2 during Hummers method?

I was perfoming the modified Hummers method and when I added the peroxide the solution went from brown to transparent yellow. After centrifugation, the graphene oxide(?) At the bottom is...

06 June 2018 5,486 5 View

How do I pre-freeze the samples before freeze drying ?

I am doing an experiment coating polyester foams and I need to freeze dry them. I put the foams immersed/squeezed in the coating solution in small test tubes in the freezer at -30 for 48 hours and...

05 May 2018 9,329 3 View

How to calculate saturation and permeability on petrel?

I have ILD, gamma ray, density and porosity log on PETREL and I wanted to estimate the saturation of oil and water and permeability as well as the oil-water contact. Can anyone give me some ideas...

11 November 2017 5,877 5 View