Universal scaling of correlated diffusion in colloidal monolayers

• Impact Factor:9.185
• DOI number:10.1103/PhysRevLett.111.168304
• Journal:Physical Review Letters (IF: 9.185, JCR Q1，自然指数（Nature Index）收录Top期刊)
• Abstract:Using the techniques of optical microscopy and particle tracking, we measure the correlated diffusion in a monolayer of uniform silica spheres dispersed at a water-air interface. It is found that the correlated motion of the interfacial particles can be well described by two universal response functions, the normalized longitudinal and transverse diffusion coefficients (D) over tilde (parallel to)(r/r(0)) and (D) over tilde (perpendicular to)(r/r(0)), where r is the interparticle distance and r(0) = a(lambda(S)/a)(3/2) is a new scaling length, which depends on both the Saffman length lambda(S) and particle radius a. The obtained response functions characterize the crossover behavior of the colloidal monolayers from the subphase-dominated three-dimensional hydrodynamics at low surface coverage to the monolayer-dominated 2D hydrodynamics at high concentrations. The surface viscosity eta((2))(s) of the colloidal monolayer obtained by two-particle rheology compares well with the one-particle measurements.
• First Author:Wei Zhang
• Co-author:Na Li,Klemen Bohinc,Penger Tong,Wei Chen*
• Document Code:168304
• Volume:111
• Issue:16
• Page Number:168304
• ISSN No.:0031-9007
• Translation or Not:no
• Date of Publication:2013-10-18
• Included Journals:SCI
• Links to published journals:https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.168304