b. The nanoparticle suspensions will be characterised using dynamic light scattering (DLS). A particle of material 1 has

[answerhappygod]

B The Nanoparticle Suspensions Will Be Characterised Using Dynamic Light Scattering Dls A Particle Of Material 1 Has 1 (78.41 KiB) Viewed 15 times

b. The nanoparticle suspensions will be characterised using dynamic light scattering (DLS). A particle of material 1 has lower mass than a particle of material 2. Briefly explain which of the two materials will generate the largest light intensity fluctuations during a DLS measurement (2 marks) C. State whether absorption spectroscopy and/or surface plasmon resonance would be suitable for monitoring the stability of the nanoparticle suspensions over an extended period of time (2 marks) d. Material 1 has a Hamaker constant of 5.000 x 10-20 J, whereas material 2 has a Hamaker constant of 7.000 x 10-20 J. Calculate the adhesion force associated with two nanoparticles in contact with each other when: i material 1 is in contact with material 1 il material 2 is in contact with material 2 Note that the relationship between Hamaker constant (with units of J) and surface energy (with units of Nm-') is approximated by q = A * 9.000 x 1097 m-2 (2 marks) e. Suggest how the suspensions might be stabilised to prevent sedimentation of the nanoparticles (2 marks)