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Norma Palmero (PhD thesis in collaboration with Ramón Castañeda)
Norma's project concerns correlations between particles trapped in harmonic potentials as the solvent undergoes a critical-point transition. She is using holographic optical tweezers to trap two particles in a lutidine/water mixture, but is also using molecular dynamics simulations to understand the phenomena. Norma is now on a research stay at Prof. Roberto Cerbino's lab
Juan Daniel Rivera (Master thesis in collaboration with Leonardo Dagdug)
Juan Daniel is experimenting with the diffusion of particles in rectangular confining channels of varying inclinations. We are looking to experimentally verify Prof. Dagdug's theoretical results.
Christian Imanol (Master student)
In collaboration with Susana Figueroa, Christian is determining the effect of the solvent on the rheological properties of polymer solutions. Experimental results are being compared with molecular dynamics simulations.
Natalia Margarita Zepeta (undergraduate student)
Magy's project is closely related to Juan Daniel's, as she performs simulations of particles in confined rectangular channels with different inclinations.
Paramagnetic group: Sarahi, Arely, Emilio
This subgroup is developing the infrastructure for a new research line in the lab: paramagnetic colloids! These are colloidal particles that, under the influence of a magnetic field, increase their repulsion, and thus, the external field can trigger the liquid-solid transition.
Microfluidic group: Luis
Luis is working closely with Rigoberto Castro to analyze the fluctuations of a viscoelastic jet in a hydrodynamic focusing microfluidic device.
Daniel Vargas
Daniel is working on developing a DWS microrheology platform in our lab. Correlation at long times is calculated from a CCD, whereas short-time correlation is calculated using a simple photodiode. Daniel is testing the setup with a worm-like micellar solution.
ALUMNI:
Juan Manuel Molina (PhD thesis). Optical manipulation of objects with an inverse index of refraction is not possible with simple optical tweezers. Using Holographic Optical Tweezers, Juan Manuel manipulated very stable bubbles in a foam. Being an unstable suspension, Juan Manuel proposed a protocol for an efficient optical calibration and performed experiments to determine the adhesion forces between bubbles of different sizes. The temporal evolution of the adhesion force was also studied.
Daniela Ramirez Bermudez (Master student), Daniela is performing rheological experiments for the food industry, in particular determining the rheological properties of Mole (yes, the awesome typical mexican dish).
Galo Salvador Díaz Andrade (undergraduate social service) developed a code for analyzing images obtained from the scattering of a critical mixture of water and lutidine. The methodology is similar to DWS, as the time correlation function of the scattered light is calculated.
Victor Herrera Canales (master student), Vic developed a Generative Adversarial Network able to reproduce the bright field images of a 2D colloidal suspensions. Interestingly, after a training with experimental images, the network could reproduce the pair correlation function of the colloidal suspension.
Luz Yazmin Solis Negrete (undergraduate social service): Yaz performed the most extensive videomicroscopy experiment ever done in our lab and defined the preparation and data analysis protocol for such experiments.
Ramon Castañeda Cerdan (undergrad social service)
Victor Herrera Canales (undergrad social service), performed a study trying to push the resolution limite of videomicroscopy down to nanometer scale.
Adriana Martínez (undergrad social service), continued Gaby's study of the viscoelastic properties of worm-like micelles. Gaby found a very interesting behavior changing the temperature of the solution. Adriana also analyzed the effects of the viscoelasticity on a hydrodynamic-focusing microfluidic channel.
Jaime Albarrán (undergrad social service), studied the 2D structures formed by the aggregation of monomer particles induced by the depletion effect. When polymer or small particles are added to a colloidal suspension, the modification of the osmotic pressure, as the depletant is unable to fit between two colloidal particles, induces an attractive force on the particle, giving aggregation. Aggregation also increases the gravitational effect on the particles and thus forms a structure in the glass plate below. Jaime explored different physical parameters in order to correlate them with the structure formed.
Alan García and Emilio Villa explored the random walker simulation to simulate several situations of colloidal science interest: confinement due to optical tweezers, unidirectional external fields, and harmonic and Brownian cages.
Doriana Dorta (University of Panama), Hector Contreras (UASLP), Karim Romero (UASLP), Summer research program 2018. Doriana, Hector and Karim studied the behavior of individual cells (red blood cells) under deformation using Holographic Optical Tweezers. This project was done in collaboration with Beatriz Morales and Francisco Perez, Engineering school, UASLP.
Gabriela Angeles Robles (summer student 2017), currently PhD student at PCI, UASLP. Gaby performed a short microrheologic study of a wormlike micellar system (CTAB-NaSal) using a DLS system and comparing with mechanical rheology experiments.
Daniela Pérez (undergraduate thesis 2018), currently master student at PCI, UASLP. Daniela study the dynamic properties of colloidal particles interacting with a periodic potential. In collaboration with Dr. Ivan Guerrero, we are still working in this project, analyzing the statistics of the jump time distribution using brownian dynamics simulations
Yuridia Selene Posadas García (undergraduate thesis 2016), currently PhD student at PCI, UASLP. Yuri's thesis is named "Manipulation and neuronal growth using optical tweezers". Yuri used an infra-red optical tweezers to manipulate neurons (in collaboration with Alfredo Méndez IFUASLP).
Alejandro Rivera Morán (undergraduate thesis 2016), currently PhD student at Julich, Germany. Alex's thesis is named "Manipulation of anisotropic particles and bacterias using laser-induced external fields". Using a periodical distribution of light Alex is comparing the predictions of a recently developed algorithm for the calculation of the energy landscape of spherical clusters in periodical distributions of light with experimental results.
Jose Ramón Villanueva Valencia (Masters and summer student 2013-2015), currently PhD stutent at Leon Guanajuato. Ramón studied the diffusion of a mixture of monomers and dumbbells in severe confinement, both theoretically and experimentally (Phys. Rev. E 94, 012608 (2016))
Andrea Llanas (undergraduated student short stay 2016). Andrea developed the technique of the recovery of optical parameters using as an standard a colloidal suspension comparing her experimental results with Mie's scattering theory. Andrea also analyzed the possibility of describing light propagation in a binary mixture of particles of different sizes (in collaboration with Beatriz Morales, FIUASLP).
María de Jesús Martínez (summer student 2013), currently Masters student at IFUASLP. Chuy made progress in David's Pine synthesis of colloidal clusters, but using UV radiated non-crosslinked particles instead of cross-linked particles.
Lisbeth Pérez Ocampo (summer student 2013), currently PhD student at León Guanajuato. Lis worked in the depletion problem, using a mixture of 1.5 micron and 0.2 micron particles, finding that bigger particles feels an attraction between them and glass plates.
Mariana Dorantes Gilardi (summer student 2013), currently Master student at CICESE. Mariana studied the electrophoretic phenomena in viscoelastic materials.
COLLABORATORS:
Dr. Ryan McGorty, University of San Diego
Prof. Jose Luis Arauz Lara, Institute of Physics, University of San Luis Potosí
Prof. Rolando Castillo, Institute of Physics, National University of México
Dr. Iván Santamaría Holek, School of Sciences, National University of México
Dr. Beatriz Morales Cruzado, School of Engineering, University of San Luis Potosí
Dr. Francisco Gerardo Pérez Gutiérrez, School of Engineering, University of San Luis Potosí
Dr. Ramón Castañeda Priego, Science and Engineering Division, University of Guanajuato
Dr. Alfredo Méndez Cabañas, Institute of Physics, University of San Luis Potosí
Dr. Ivan Guerrero Garcia, Institute of Physics, University of San Luis Potosí
Prof. Dr. Stefan U. Egelhaaf, Physik der weichen Materie, University of Dusseldorf, Germany
Dra. Vanesa Olivares Illana, Institute of Physics, University of San Luis Potosí
Dra. Susana Figueroa Gerstenmaier, Science and Engineering Division, University of Guanajuato
Prof. Leonardo Dagdug, UAM Iztapalapa
Prof. Roberto Cerbino, Vienna
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