Jaime Martínez

[Jaime Martínez @jaimr41]

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[Jaime Martínez @jaimr41]

@FerreiroCordova @icstcf2020 Thank you. Yes, and depending on the effective Péclet number we expect homogeneous gels (Pe_g<0.01) or heterogeneous gels (Pe_g>~0.01). No, we have only worked with spherical particles.

[Jaime Martínez @jaimr41]

Hi! I'am glad to present my poster entitled "Effect of the gravitational field on the gelation in sticky colloidal dispersions" at the @icstcf2020.
#ICSTCF21Poster
#Gelation
#GravitationalPécletNumber
#ColloidalDispersions

[Jaime Martínez @jaimr41]

@FerreiroCordova @Paco_Alarcon @icstcf2020 We only work with a fixed packing fraction of 0.181. But yes, if the packing fraction is low enough, a fractal dimension < 2 can be obtained, since the percolating cluster that will be formed (depending on the force of attraction between the particles) will not be so compact.

[Ramón Castañeda-Priego @phdramoncp]

I am very proud of the excellent research work done by my PhD students; @NormaPalmero @jaimr41 @MigueSandoval93 @JavierA92576741 @RmnPerdomo. See their posters at the Complex Fluids Meeting @icstcf2020!

[Jaime Martínez @jaimr41]

@Paco_Alarcon @icstcf2020 No. I mean that the more compact the cluster, the larger the fractal dimension. At high Péclet numbers, the cluster that percolates and settles becomes more compact.

[Jaime Martínez @jaimr41]

@Paco_Alarcon @icstcf2020 Generally, at high Péclet numbers, a cluster that percolates is formed and it settles at the bottom of the simulation box, so the fractal dimension of this cluster will be greater than in a system with the same force of attraction between its particles but with lower Péclet.

[Jaime Martínez @jaimr41]

@Paco_Alarcon @icstcf2020 Yes, the fractal dimension using the mass or using the radius of gyration should be the same.

[Jaime Martínez @jaimr41]

@Paco_Alarcon @icstcf2020 We repeat this procedure for all the particles in the cluster for averaging. To calculate the mass we use an algorithm similar to the one used when calculating the pair correlation function with the difference that the number of particles accumulate inside the different shells.

[Jaime Martínez @jaimr41]

@Paco_Alarcon @icstcf2020 Thank you. To calculate the mass it is necessary to focus on a particle inside of the cluster, then we use a sphere of radius r centered on that particle, the mass is the number of particles within that sphere.

[Jaime Martínez @jaimr41]

@ErickSa56721343 @icstcf2020 We calculate the MSD for particles that were initially at the top or bottom in the box. The differences are mainly related with indirect interactions between the particles since those at the bottom are more confined than those at the top.

[Jaime Martínez @jaimr41]

I'm glad to present my poster "Transport properties in short-range attractive colloidal systems under gravitational fields" at the @icstcf2020.
#ICSTCF20Poster
#AggregatingColloids
#PhaseSeparation
#Sedimentation
#PécletNumber

[Jaime Martínez @jaimr41]

@Alpixels @icstcf2020 In the video, the size of fast particles was increased for better visualization.

[Jaime Martínez @jaimr41]

@Alpixels @icstcf2020 Thank you Alexis. No, I haven't determined it. The MSD for the fast and slow particles is quite similar due to after certain time the fast particles can go to the bottom of the box and the slow particles can go to the top of the box, as you can see in the next video:

[Jaime Martínez @jaimr41]

@Alpixels @icstcf2020 It is because the same reason as for the MSD explained above. Therefore, we want to vary the depth of the well and the Péclet number in order to obtain more significant differences between the transport properties of the fast and slow particles.