Soumia Cheddah

4 Questions 13 Answers 0 Followers

Questions related from Soumia Cheddah

How to accurately calculate the filling factor of a photonic colloidal crystal from its reflection wavelength?

The crystal structure is FCC (for a perfect crystal the theoretical filling factor or volume fraction of particles should be 0.74), particles are silica with a refractive index of 1.42 and a...

29 March 2022 6,243 11 View

How to calulate surface coverage of alkyltrichlorosilane grafted on silica particles from 29Si solide state NMR?

During the reaction of trifunctional alkylsilane, one or two linkagea are formed per silane molecule leading to a stoichiometric factor. How we can estimate this factor from 29Si solid state NMR?...

30 August 2019 851 6 View

Is it possible to measure zeta potential in an organic solvent?

My silica particles bear hydrophobic moieties and residual silanol groups, they can only be suspended in an organic solvent but I believe they still have a certain electrostatic interaction due to...

24 July 2019 6,839 15 View

How to cut a sample for SEM analysis (cross-section of a capillary packed column)?

We are preparing new packed capillary columns (packed with silica particles) for capillary electrochromatography. One of the techniques we use for the characterization is SEM of the cross section,...

10 December 2018 941 4 View