Electrostatic Directed Assembly of Colloidal Microparticles Assisted by Convective Flow

Teulon, Lauryanne; Hallez, Yannick; Raffy, Simon; Guérin, François; Palleau, Etienne; Ressier, Laurence

doi:10.1021/acs.jpcc.8b08981

Cited by 10 publications

(4 citation statements)

References 30 publications

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“…The adjustment of the charge upon approach is regulated by adsorption/desorption equilibria, which involves AOT surfactant in a peculiar way that seems to maintain a roughly constant surface potential. Recent electrophoretic mobility measurements have also shown strong charge regulation upon increasing particle concentration for polymeric colloids in AOT/dodecane suspensions [56] and in pure isopropanol [63]. It seems that for both colloidal stability and charging of particles at elevated concentrations charge regulation is driven by similar adsorption/desorption mechanism.…”

Section: Particle Aggregationmentioning

confidence: 98%

Surfactant mediated particle aggregation in nonpolar solvents

Farrokhbin

Stojimirovic

Galli

et al. 2019

Phys. Chem. Chem. Phys.

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Aggregation behavior of particles in nonpolar medium is studied with time-resolved light scattering. At low concentrations of surfactant particles are weakly charged and suspensions are not stable. Suspensions get progressively more stable with increasing surfactant concentration as particles get more highly charged. At high concentrations the particles get neutralized and aggregation is again fast. The theory of Derjaguin, Landau, Verwey, and Overbeek (DLVO) is able to predict the stability ratios quantitatively by using the experimentally measured surface charge, screening lengths and van der Waals forces.

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Section: Particle Aggregationmentioning

confidence: 98%

Surfactant mediated particle aggregation in nonpolar solvents

Farrokhbin

Stojimirovic

Galli

et al. 2019

Phys. Chem. Chem. Phys.

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“…[33,34] Another important method is electrostatic assembly, which is based on the electrostatic interaction between the particle and substrate. [35][36][37] The substrate is pre-functionalized in such a way that an electrostatic contrast is generated, which enables NCs of opposite charge to be selectively adsorbed. [38,39] Optical printing is yet another effective method for single particle assembly and positioning.…”

Section: Introductionmentioning

confidence: 99%

A General Method for Direct Assembly of Single Nanocrystals

Zhang

Liu

Ashokan

et al. 2022

Advanced Optical Materials

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Controlled nanocrystal assembly is a pre‐requisite for incorporation of these materials into solid state devices. Many assembly methods have been investigated which target precise nanocrystal positioning, high process controllability, scalability, and universality. However, most methods are unable to achieve all of these goals. Here, surface templated electrophoretic deposition (STED) is presented as a potential assembly method for a wide variety of nanocrystals. Controlled positioning and deposition of a wide range of nanocrystals into arbitrary spatial arrangements − including gold nanocrystals of different shapes and sizes, magnetic nanocrystals, fluorescent organic nanoparticles, and semiconductor quantum dots − is demonstrated. Nanoparticles with diameters <10 nm are unable to be deposited due to their low surface charge and strong Brownian motion (low Péclet number). It is shown that this limit can be circumvented by forming clusters of nanocrystals or by silica coating nanocrystals to increase their effective size.

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“…As the use of effective potentials and closures with the OZ equation remains an active research topic especially under concentrated and low salt conditions [15], we also performed particle scale numerical calculations using Brownian dynamics coupled to a three-dimensional nonlinear Poisson-Boltzmann solver providing the many-body electrostatic forces exerted on each colloid (Particle-Field Brownian Dynamics, PFBD, see SM [27]) [47][48][49][50][51]. This method is more precise as it does not rely on approximate closure relations and does not require the definition of an effective potential.…”

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confidence: 99%

Microfluidic osmotic compression of a charge-stabilized colloidal dispersion: Equation of state and collective diffusion coefficient

Keita,

Hallez,

Salmon

2022

Preprint

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We show, using a model coupling mass transport and liquid theory calculations for a charge-stabilized colloidal dispersion, that diffusion significantly limits measurement times of its Equation Of State (EOS), osmotic pressure vs composition, using the osmotic compression technique. Following this result, we present a microfluidic chip allowing one to measure the entire EOS of a charged dispersion at the nanoliter scale in a few hours. We also show that time-resolved analyses of relaxation to equilibrium in this microfluidic experiment lead to direct estimates of the collective diffusion coefficient of the dispersion in Donnan equilibrium with a salt reservoir.

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Electrostatic Directed Assembly of Colloidal Microparticles Assisted by Convective Flow

Cited by 10 publications

References 30 publications

Surfactant mediated particle aggregation in nonpolar solvents

Surfactant mediated particle aggregation in nonpolar solvents

A General Method for Direct Assembly of Single Nanocrystals

Microfluidic osmotic compression of a charge-stabilized colloidal dispersion: Equation of state and collective diffusion coefficient

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