2007/11/19 by B. V. R. Tata, P. S. Mohanty, Priti S. Mohanty +1
Chemistry · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Aqueous solution #Aqueous suspension #Attraction #Biophysics #Charged particle #Chemical physics #Chemistry #Chromatography #Colloid #Colloidal particle #Confocal #Confocal laser scanning microscopy #Counterion #Electrostatics and Colloid Interactions #Ion #Material Dynamics and Properties #Materials science #Nanotechnology #Optics #Physical chemistry #Physics #Polymer #Polystyrene #Range (aeronautics) #Spectroscopy and Quantum Chemical Studies #Suspension (topology) #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1016/j.ssc.2008.06.026
8 pages, 4 figures, submitted to Phys. Rev. Lett
arxiv created 2007/11/19 · openalex publication_date 2008/07/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report observations of stable bound pairs in very dilute deionized aqueous suspensions of highly charged polystyrene colloidal particles, with monovalent counterions, using a confocal laser scanning microscope. Through an analysis of several thousands of time series of confocal images recorded deep inside the bulk suspension, we find that the measured pair-potential, U(r) has a long-range attractive component with well depths larger than the thermal energy. These observations provide a direct and unequivocal evidence for the existence of long-range attraction in U(r) of like-charged colloidal particles.