2013
DOI: 10.1021/jp401889m
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Decoration of Microparticles by Highly Charged Nanoparticles

Abstract: A negatively charged microparticle is immersed into an aqueous solution containing highly negatively charged nanoparticles and an electrolyte. Using a modified Poisson-Boltzmann equation which takes into account the van der Waals interactions between microparticle and nanoparticles and in which the latter are treated as macro-ions, it was found that there are conditions under which the concentration of nanoparticles close to the microparticle becomes larger (even much larger) than the bulk one and halos are fo… Show more

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Cited by 10 publications
(7 citation statements)
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“…This implies that the interaction between GO and GnP is the highest at this combination which also suggests that much of the hydrophilic sites on GO are occupied by GnP. Previous studies have also highlighted an optimum concentration range of colloidal mixtures to yield a stable hybrid system [ 84 , 115 , 116 ]. As the GnP concentration increases beyond this benchmark, the viscosity rapidly drops which may indicate the saturation of GnP on GO sheet and the remaining particles will strongly flocculate and form much bigger structures.…”
Section: Resultsmentioning
confidence: 83%
“…This implies that the interaction between GO and GnP is the highest at this combination which also suggests that much of the hydrophilic sites on GO are occupied by GnP. Previous studies have also highlighted an optimum concentration range of colloidal mixtures to yield a stable hybrid system [ 84 , 115 , 116 ]. As the GnP concentration increases beyond this benchmark, the viscosity rapidly drops which may indicate the saturation of GnP on GO sheet and the remaining particles will strongly flocculate and form much bigger structures.…”
Section: Resultsmentioning
confidence: 83%
“…Mixtures of charged colloids have been modeled, e.g., by integral-equation theory [64][65][66][67][68][69][70][71][72][73], Poisson-Boltzmann theory [74][75][76][77][78], and computer simulation [79][80][81][82][83]. Motivated by experimental observations, several studies of colloid-nanoparticle mixtures [69,71,77,78,80] computed effective pair interactions between colloids that are qualitatively consistent with the postulated nanoparticle haloing mechanism. Further studies are needed, however, to chart the multidimensional parameter space.…”
Section: Introductionmentioning
confidence: 99%
“…where the Hamaker constant A ij depends on the dielectric constants of both the particles and the medium. Since we restrict attention here to like-charged particles whose repulsive electrostatic interactions are sufficiently strong to prevent nanoparticle adsorption, we neglect dielectric polarization effects, as in previous studies of charged colloidal mixtures [23][24][25][26][27][28][29][30][31][32][33][34][35][37][38][39][40][41]. Although induced polarization charges may affect self-assembly of strongly coupled, oppositely charged colloidal mixtures [42], charge-charge interactions are expected to dominate in the moderately coupled, like-charged systems investigated here.…”
Section: Coarse-grained Model Of Colloid-nanoparticle Mixturesmentioning
confidence: 99%
“…Charged colloidal mixtures have been modeled by a variety of theoretical and computational methods, including computer simulations [22][23][24][25][26], integral-equation theory [27][28][29][30][31][32][33][34][35][36], and Poisson-Boltzmann theory [37][38][39][40][41]. Several recent studies of highly asymmetric mixtures of charged colloids and nanoparticles [23,32,33,40,41] yielded effective colloid-colloid pair interactions that support the postulated nanoparticle haloing mechanism for certain system parameters. However, while previous studies have focused on weakly charged colloids mixed with oppositely-charged nanoparticles, relatively little is known about the influence on suspensions of strongly charged colloids of like-charged nanoparticles.…”
Section: Introductionmentioning
confidence: 99%