Tip Charge Dependence of Three-Dimensional AFM Mapping of Concentrated Ionic Solutions

Benaglia, Simone; Uhlig, Manuel R.; Hernández‐Muñoz, Jose; Chacón, Enrique; Tarazona, P.; García, Ricardo García

doi:10.1103/physrevlett.127.196101

Cited by 26 publications

(36 citation statements)

References 61 publications

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“…7 and S8 ). To fill the gap between these results and the molecular dynamics reported from the simulations, advanced techniques such as the charge dependence of three-dimensional atomic force microscope (3D AFM) 41 and neutron reflectivity (NR) 42 may be used to resolve macromolecular diffusion and entanglement. On the other hand, in contrast to the fusion by HCM, the process of injection is more complicated for the coupling between the processes of momentum, heat, and mass transfer 10 .…”

Section: Discussionmentioning

confidence: 99%

Two-step heat fusion kinetics and mechanical performance of thermoplastic interfaces

Wang

Shi

Shimizu

et al. 2022

Sci Rep

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Thermoplastic polymers and composites are ubiquitous in the industry for their reshaping and fusing capabilities at elevated temperatures. The quality of heat-fused thermoplastic interfaces is of great concern for adhesion, coating, and welding applications, especially those between dissimilar materials. Kinetic evolution of the microstructures defines the mechanical performance of heat-fusion thermoplastic interfaces, which is studied here using polyethylene and polypropylene as an example. Key factors such as the viscosity and compatibility of polymers and the time and temperature of fusion are discussed by combining molecular-level simulations and structural-level hot-compression experiments. Inter-diffusion and entanglement of polymer chains are identified as the two elementary kinetic steps of the fusion, which dominate the control on the stiffness and strength of the interfaces, respectively. Experimental data shows that the quality of fused interfaces can be improved by reducing the viscosity and the interaction parameter. Following the same set of time-scaling relations as identified in the simulations, the two-step characteristics and their effects on the stiffness and strength are experimentally validated. Both simulation and the experiment results show that Young’s modulus of fused interfaces recovers faster than the strength that is controlled by polymer entanglement to a large extent, rather than diffusion. These findings add insights into the design of fusion processes, laying the ground for the applications of thermoplastic polymers and composites.

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Section: Discussionmentioning

confidence: 99%

Two-step heat fusion kinetics and mechanical performance of thermoplastic interfaces

Wang

Shi

Shimizu

et al. 2022

Sci Rep

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“…As already discussed in the Introduction we think that the application to AFM measurements of structural forces are an evident first step to take. Previous work by Benaglia et al [29] went already along this path employing density-functional theory (DFT). We think that the main advantage of the fieldtheoretic approach is its high transparency of the physical mechanisms explicitly built into the theory, in particular the flexibility of the treatment of the boundary conditions.…”

Section: Discussionmentioning

confidence: 99%

A comprehensive continuum theory of structured liquids

Blossey¹,

Podgornik²

2022

Preprint

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We develop a comprehensive continuum model capable of treating both electrostatic and structural interactions in liquid dielectrics. Starting from a twoorder parameter description in terms of charge density and polarization, we derive a field-theoretic model generalizing previous theories. Our theory explicitly includes electrostatic and structural interactions in the bulk of the liquid and allows for polarization charges within a Drude model. In particular, we develop a detailed description of the boundary conditions which include the charge regulation mechanism and surface polarization. The general features for solving the saddle-point equations of our model are elucidated and future applications to predict and validate experimental results are outlined.

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“…In recent years, highly concentrated electrolytes have attracted a lot of attention [22][23][24][25] due to their numerous potential applications and surprising experimental observations [26][27][28]. At the same time, advances in nonequilibrium theories such as stochastic density functional theory (often referred to as the Kawasaki-Dean equation) [29][30][31][32], have led to a new way of calculating the ionic conductivity in the dilute limit [33][34][35], which is far simpler than the previous ionic-cloud-based approach.…”

Section: Introductionmentioning

confidence: 99%

Conductance of concentrated electrolytes: multivalency and the Wien effect

Avni¹,

Andelman²,

Orland³

2022

Preprint

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The electric conductivity of ionic solutions is well understood at low ionic concentrations of up to a few millimolar but becomes difficult to unravel at higher concentrations that are still common in nature and technological applications. A model for the conductivity at high concentrations was recently put forth for monovalent electrolytes at low electric fields. The model relies on applying a stochastic density-functional theory and using a modified electrostatic pair-potential that suppresses unphysical, short-range electrostatic interactions. Here, we extend the theory to multivalent ions as well as to high electric fields where a deviation from Ohm's law known as the Wien effect occurs. Our results are in good agreement with experiments and recent simulations.

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Tip Charge Dependence of Three-Dimensional AFM Mapping of Concentrated Ionic Solutions

Cited by 26 publications

References 61 publications

Two-step heat fusion kinetics and mechanical performance of thermoplastic interfaces

Two-step heat fusion kinetics and mechanical performance of thermoplastic interfaces

A comprehensive continuum theory of structured liquids

Conductance of concentrated electrolytes: multivalency and the Wien effect

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