生化工程国家重点实验室特邀学术报告

报告题目：检测软材料的新型光散射技术：从高聚物、微胶体到胶体、乳液的团聚过程

报告人：瑞士弗里堡大学Scheffold教授

报告时间：2011年9月2日，星期五

报告地点：过程大厦308

报告人简介：

Frank Scheffold, Full Professor

Soft Matter and Photonics Lab, Head, Physics Department andFribourgCenterfor Nanomaterials,UniversityofFribourg

RESEARCH：

Physics of Nanoparticles and Colloidal Dispersions, Aggregation and Gelation in Concentrated Particle uspensions (Food, Ceramics), Optical Microrheology of Complex Fluids, Biopolymer Solutions and Gels mall Angle Neutron Scattering (SANS), Static and Dynamic Light Scattering, Diffusing Wave pectroscopy (DWS). Wave Propagation in Random Media, Amorphous Photonic Materials, Statistical ptics, Biomedical Optical Imaging. Binary Polymer Melts: Surface Segregation and Wetting (not active).

Publications:

Reviews: F. Scheffold and R. Cerbino, New trends in light scattering, Current Opinion in Colloid & Interface Science 12 (1), 50-57 (2007); P. Zakharov and F. Scheffold, Advances in dynamic light scattering, "Light Scattering Reviews 4", A.A. Kokhanovsky (Editor), Springer-Praxis Publishing Ltd., Chichester, UK (June, 2009)

Block,I.and Scheffold, F., Review of Scientific Instruments 81, 123107 (2010)

F. Scheffold, P. Diaz-Leyva, et al., Physical Review Letters 104, 128304, (2010)

Luis F. Rojas-Ochoa, et al, Physical Review Letters 100, 178304 (2008)

N. Willenbacher, et al, Physical Review Letters 99, 68302 (2007)

报告摘要：

To characterize the structural and dynamic properties of soft materials and small particles, information on the relevant mesoscopic length scales is required. Such information is often obtained from traditional static and dynamic light scattering (SLS/DLS) experiments in the single scattering regime. In many dense systems, however, these powerful techniques frequently fail due to strong multiple scattering of light. Here I will discuss some experimental innovations that have emerged over the last decade. New methods such as 3D static and dynamic light scattering (3D LS) as well as diffusing wave spectroscopy (DWS) can cover a much extended range of experimental parameters ranging from dilute polymer solutions, colloidal suspensions to extremely opaque viscoelastic emulsions. I will briefly discuss some examples taken from our own research such as thermosensitive microgel particles, dense colloidal gels, the microrheology of wormlike micelle solutions and the glassy dynamics and elasticity of monodisperse emulsions.