Immersion of Charged Nanoparticles in a Salt Solution/Air Interface

@article{dhar08, abstract = {Abstract: Electrostatic interactions strongly affect the immersion depth of nanoparticles into an interface. We prove this statement by measuring the diffusion constant of charged nanoparticles at a sodium chloride solution/air interface. Interfacial diffusion of nanoparticles slows down with increasing ionic strength of the sodium chloride solution. Hydrodynamic calculations are used to estimate the immersion depth from the diffusion constant, suggesting that nanoparticles with a carboxylate surface are only slightly immersed into a bare air/water interface. With increasing molarities of sodium chloride, the immersion depth increases to complete immersion for a 102 molar solution. Our experiments show that the location of nanoparticles at interfaces is determined by an intricate interplay between the electrostatic properties of the solution/air interface, the solution/solid interface, and the classical contact angle.}, address = {Department of Chemical Engineering, The University of California Santa Barbara, Department of Physics, Emory University, Atlanta, GA, and Institut f\"{u}r Experimentalphysik V, Universitat Bayreuth, 95440 Bayreuth, Germany}, author = {Dhar, Prajnaparamita and Prasad, Vikram and Weeks, Eric R. and Bohlein, Thomas and Fischer, Thomas M. }, citeulike-article-id = {3102407}, doi = {http://dx.doi.org/10.1021/jp805042j}, journal = {J. Phys. Chem. B}, keywords = {interface, microrheology}, month = {August}, number = {32}, pages = {9565--9567}, posted-at = {2008-08-08 21:18:43}, priority = {0}, title = {Immersion of Charged Nanoparticles in a Salt Solution/Air Interface}, url = {http://dx.doi.org/10.1021/jp805042j}, volume = {112}, year = {2008} }

TY - JOUR ID - dhar08 L3 - citeulike-article-id:3102407 N2 - Abstract: Electrostatic interactions strongly affect the immersion depth of nanoparticles into an interface. We prove this statement by measuring the diffusion constant of charged nanoparticles at a sodium chloride solution/air interface. Interfacial diffusion of nanoparticles slows down with increasing ionic strength of the sodium chloride solution. Hydrodynamic calculations are used to estimate the immersion depth from the diffusion constant, suggesting that nanoparticles with a carboxylate surface are only slightly immersed into a bare air/water interface. With increasing molarities of sodium chloride, the immersion depth increases to complete immersion for a 102 molar solution. Our experiments show that the location of nanoparticles at interfaces is determined by an intricate interplay between the electrostatic properties of the solution/air interface, the solution/solid interface, and the classical contact angle. IS - 32 JF - J. Phys. Chem. B AD - Department of Chemical Engineering, The University of California Santa Barbara, Department of Physics, Emory University, Atlanta, GA, and Institut für Experimentalphysik V, Universitat Bayreuth, 95440 Bayreuth, Germany EP - 9567 TI - Immersion of Charged Nanoparticles in a Salt Solution/Air Interface VL - 112 SP - 9565 KW - interface KW - microrheology AU - Dhar, Prajnaparamita AU - Prasad, Vikram AU - Weeks, Eric AU - Bohlein, Thomas AU - Fischer, Thomas PY - 2008/08/14/ UR - http://dx.doi.org/10.1021/jp805042j ER -