University of Fribourg, Switzerland
Hyperuniformity, optical forces and correlated disordered in soft condensed matter
In this talk, I will give an overview of our research activities in Fribourg. We address different thrusts of experimental and numerical research all in connection with the study of amorphous soft condensed matter. Our general aim is to control and understand how structure and interactions define the macroscopic properties of disordered materials. We study materials composed of mesoscale or colloidal building blocks. These are either chemically synthesized, fabricated by ultra-high-resolution 3D lithography or prepared using shear ruptured and purified emulsion droplets. The microscopic structure and the local motion can be observed and controlled in three dimensions using confocal and dSTORM microscopy and optically induced forces. The macroscopic properties we address are the elasticity, flow, structural color, photonic bandgaps, and Anderson localization.
Superresolution microscopy, packing of microgels and rheology:
G.M. Conley , P . Aebischer , S. Nöjd, P . Schurtenberger , F . Scheffold, Jamming and overpacking fuzzy microgels: Deformation, interpenetration, and compression, Science Advances 3 (10), e1700969 (2017)
G.M. Conley, J.L. Harden & F. Scheffold, Relationship between rheology and structure of interpenetrating, deforming, and compressing microgels, Nature Communications 10, 2436 (2019)
Driven motion in an emulsion glass:
Nesrin Senbil, Markus Gruber, Chi Zhang, Matthias Fuchs, and Frank Scheffold, Experimental observation of strongly heterogeneous displacements at the depinning transition in a colloidal glass, Physical Review Letters, 122, 108002 (2019)
Diffusing Wave Spectroscopy and particle tracking based microrheology:
H.S. Kim, N. Senbil. C. Zhang, F. Scheffold and T.G. Mason, Diffusing wave microrheology of highly scattering concentrated monodisperse emulsions, Proc. of the Nat. Academy of Sciences 116 (16), 7766- 7771 (2019)
Hyperuniformity: Photonic Bandgap materials and Anderson Localization of light.
N. Muller, J. Haberko, C. Marichy, F. Scheffold, Photonic hyperuniform networks obtained by silicon double inversion of polymer templates, Optica 4 (3), 361-366 (2017)
L.S. Froufe-Pérez, M. Engel, J.J. Sáenz, F. Scheffold, Band gap formation and Anderson localization in disordered photonic materials with structural correlations, PNAS, 114 (36), 05130 (2017)
Random light forces:
G.. Brügger, L. S. Froufe-Pérez, F. Scheffold, and J. J. Saenz, Controlling dispersion forces between small particles with artificially created random light fields, Nature Communications 6, 7460 (2015)
Jorge Luis-Hita, Manuel I. Marques, Rafael Delgado-Buscalioni, Nuno de Sousa, Luis S. Froufe-Perez, Frank Scheffold, Juan Jose Saenz, Light induced "Mock Gravity" at the nanoscale, to appear Physical Review Letters