Forces between interfaces in concentrated nanoparticle suspensions and polyelectrolyte solutions

Scarratt, Liam R. J.; Trefalt, Gregor; Borkovec, Michal

doi:10.1016/j.cocis.2021.101482

Cited by 10 publications

(4 citation statements)

References 99 publications

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“…In order to distinguish the contributions of salt ions and PEs to the induced forces, we first consider the salt-free systems. In Figure a, the oscillatory forces as reported in the literature , are observed by using both DFT and self-consistent field theory (SCFT). Because of the consideration of electrostatic correlations in DFT, the attenuated interchain repulsion of PEs facilitates the accumulation of PE chains in slits.…”

Section: Resultsmentioning

confidence: 80%

“…Many experiments have shown that the oscillating interactions are related to the occurrence of charge reversal and inversion on the charged surfaces. − In general, due to the challenge of singling out the effects of individual variables, it is difficult to explore the origins of the rich and complicated behaviors in nanoconfined PE systems by only using experimental techniques . However, as complementary approaches, theories and simulations allow for facile control of the factors that influence the force behaviors between two charged surfaces induced by PE solutions. , Using Monte Carlo simulations, Pegado et al and Guldbrand et al found that the ion–ion correlations make the counterions adsorb more at the charged walls and thus reduce the electric double layer overlapping, which results in a shorter range of the interactions. Moreover, Pegado et al demonstrated that the attractive forces between two charged surfaces are driven by the energy while the repulsions are mainly of entropic origin.…”

Section: Introductionmentioning

confidence: 99%

“…23 However, as complementary approaches, theories and simulations allow for facile control of the factors that influence the force behaviors between two charged surfaces induced by PE solutions. 20,24 Using Monte Carlo simulations, Pegado et al 24 and Guldbrand et al 25 found that the ion−ion correlations make the counterions adsorb more at the charged walls and thus reduce the electric double layer overlapping, which results in a shorter range of the interactions. Moreover, Pegado et al demonstrated that the attractive forces between two charged surfaces are driven by the energy while the repulsions are mainly of entropic origin.…”

Section: ■ Introductionmentioning

confidence: 99%

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Force Regulation by Sequence-Defined Polyelectrolytes

Chang

Jiang

2023

Macromolecules

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In order to achieve multifunctional adhesive materials with water and salt tolerance, it is crucial to understand the electrostatic mechanism of nanoconfined polyelectrolytes (PEs) with specific monomer sequences. Here, using density functional theory (DFT), self-consistent field theory (SCFT), and molecular dynamics (MD) simulation, we analyzed the microstructures of sequence-defined PEs confined in a nanoscale slit and the relationship between sequences and the attractive forces induced by the nanoconfined PEs. Among three sequence-defined (alternating [A], tapered [T], and reversely tapered [R] sequence) PEs, due to the formation of stable multibridge conformations, [A]-sequence PEs induce the strongest attractive forces even in the case with high salt concentrations, i.e., the best salt tolerance. It is worth emphasizing that salt enhancement of attractive forces occurs in systems with [A]-sequence PEs due to the screening of repulsive interactions between PE chains. In contrast, in systems with [T]-sequence PEs, the shielding of the attractive interactions between surfaces and charged monomers significantly attenuates the attractive forces between surfaces at high salt concentrations. In addition, the strength of attractive forces can be regulated by block number N b. At high charge fractions such as f c = 0.5, the attractive forces induced by [A]-sequence PEs become stronger with N b, while at low charge fractions such as f c = 0.2, the attractive forces vary nonmonotonically with N b due to the electrostatic correlations.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Force Regulation by Sequence-Defined Polyelectrolytes

Chang

Jiang

2023

Macromolecules

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“…We expect that our non-local, non-linear theory of structured dielectrics as reviewed above should be particularly relevant and useful in the context of experiments on surface and interface interactions. Surface force apparatus (SFA), atomic force microscopy (AFM) or the colloidal probe technique based on AFM have recently demonstrated their value in probing the balance of forces and their interdependence between short-range hydration structural oscillatory forces and longer-ranged Derjaguin-Landau-Verwey-Overbeek forces at solid-liquid interfaces [52][53][54][55][56]. However, the measured interaction contains many unrelated as well as related effects, stemming in general from non-electrostatic couplings in the system 1 such as the chemical nature of ions, their size and charge, as well as polarizability, and solvent structuring hydrogen bonds, to invoke just a few [55].…”

Section: Onsager-dupuis Theory Of Dielectric Properties Of Ice -mentioning

confidence: 99%

Continuum theories of structured dielectrics

Blossey

Podgornik

2022

EPL

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Aqueous dielectrics are ubiquitous in soft- and bio-nano matter systems. The theoretical description of such systems in terms of continuum (“macroscopic”) theory remains a serious challenge. In this perspective we first review the existing continuum phenomenological approaches that have been developed in the past decades. In order to describe a path to advance continuum theory beyond these approaches we then take recourse to the Onsager-Dupuis theory of the dielectric behaviour of ice, which, for the case of a solid dielectric, exemplified important conceptual issues we deem relevant for the development of a more fundamental continuum theory of liquid dielectrics. Subsequently, we discuss our recently proposed continuum field theory of structured dielectrics, which provides a generalized approach to the dielectric behavior of such systems.

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