4.2 Article

Soft repulsive interactions, particle rearrangements and size selection in the self-assembly of nanoparticles at liquid interfaces

期刊

FARADAY DISCUSSIONS
卷 181, 期 -, 页码 261-280

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c5fd00001g

关键词

-

资金

  1. Swiss National Science Foundation [PP00P2_126483/1, PP00P2_150738]
  2. National Science Foundation [NSF PHY11-25915]
  3. Swiss National Science Foundation (SNF) [PP00P2_150738] Funding Source: Swiss National Science Foundation (SNF)

向作者/读者索取更多资源

In the adsorption of nanoparticles at liquid interfaces, soft and short ranged repulsive effective interactions between the nanoparticles at the interface may eventually induce crowding, slow dynamics and jamming at high surface coverage. These phenomena can interfere during the adsorption process, significantly slowing down its kinetics. Here, by means of numerical simulations, we find that modifying the effective interactions, which can be achieved for example by grafting differently functionalized polymer shells on the bare nanoparticles, may qualitatively change such interplay. In particular our results suggest that, in the presence of ultrasoft particle interactions such as the ones described by a Gaussian Core Model potential, a small size polydispersity can be sufficient to decouple the adsorption kinetics from the slow dynamics that develops at the interface, due to a qualitative change from an irreversible adsorption controlled by particle rearrangements at the interface to one dominated by size selection mechanisms. These findings may be useful to achieve higher surface coverages and faster adsorption kinetics.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.2
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

Article Physics, Condensed Matter

Microscopic interactions and emerging elasticity in model soft particulate gels

Minaspi Bantawa, Wayan A. Fontaine-Seiler, Peter D. Olmsted, Emanuela Del Gado

Summary: By varying the model parameters of particulate gels, different gel morphologies can be obtained, and the local elastic structures identified to estimate their contribution to the gel elasticity.

JOURNAL OF PHYSICS-CONDENSED MATTER (2021)

Article Multidisciplinary Sciences

The physics of cement cohesion

Abhay Goyal, Ivan Palaia, Katerina Ioannidou, Franz-Josef Ulm, Henri van Damme, Roland J-M Pellenq, Emmanuel Trizac, Emanuela Del Gado

Summary: The cohesion of cement arises from the organization of interlocked ions and water, progressively confined in nanoslits between charged surfaces of calcium-silicate-hydrates. By reducing dielectric screening and strengthening ionic correlations, the cohesive strength of cement is enhanced.

SCIENCE ADVANCES (2021)

Article Chemistry, Physical

Like-Charge Attraction at the Nanoscale: Ground-State Correlations and Water Destructuring

Ivan Palaia, Abhay Goyal, Emanuela Del Gado, Ladislav Samaj, Emmanuel Trizac

Summary: This article discusses the attraction between like charges, challenging our understanding of electrostatics in both soft and hard matter. The research shows that even at low correlation strength, the relevant physics can be understood by studying the ground-state properties, regardless of fluctuations. By deriving a simple and accurate interaction pressure equation, the researchers explain the exotic attractive regime observed in certain materials, even without the presence of multivalent counterions.

JOURNAL OF PHYSICAL CHEMISTRY B (2022)

Article Chemistry, Physical

Ion Specificity of Confined Ion-Water Structuring and Nanoscale Surface Forces in Clays

Francis Dragulet, Abhay Goyal, Katerina Ioannidou, Roland J-M Pellenq, Emanuela Del Gado

Summary: Ion specificity has significant effects on hydrated clays, influencing the swelling and shrinkage behaviors of soil and sediments. Our computational approach reveals that the ion-water structures in nanoscale confinement are responsible for the ion-specific surface forces between clay particles. As confinement and surface charge densities increase, the ion-water structures deviate from the ions' bulk hydration shells, forming highly ordered, nearly solid-like assemblies and leading to strongly attractive interactions between charged surfaces.

JOURNAL OF PHYSICAL CHEMISTRY B (2022)

Article Multidisciplinary Sciences

Microscopic dynamics underlying the stress relaxation of arrested soft materials

Jake Song, Qingteng Zhang, Felipe de Quesada, Mehedi H. Rizvi, Joseph B. Tracy, Jan Ilavsky, Suresh Narayanan, Emanuela Del Gado, Robert L. Leheny, Niels Holten-Andersen, Gareth H. McKinley

Summary: Arrested soft materials exhibit slow stress relaxation in response to linear mechanical perturbations, but the microscopic origins of this relaxation are poorly understood. Through X-ray photon correlation spectroscopy, we studied the dynamics of a model associative gel system and found that the mean stress relaxation time is correlated to the quiescent superdiffusive dynamics of microscopic clusters during arrest. Small mechanical deformations can also induce intermittent avalanches, leading to a non-Gaussian spectrum of relaxation modes in stress relaxation measurements.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2022)

Article Mechanics

Ordered domains in sheared dense suspensions: The link to viscosity and the disruptive effect of friction

Abhay Goyal, Emanuela Del Gado, Scott Z. Jones, Nicos S. Martys

Summary: The ordering under shear in high-density suspensions of Brownian colloidal spheres is investigated, and a significant decrease in viscosity is observed. The defect structure and its contribution to stress in the suspension are studied, along with the effect of contact friction force.

JOURNAL OF RHEOLOGY (2022)

Article Mechanics

Time-resolved microstructural changes in large amplitude oscillatory shear of model single and double component soft gels

Gavin J. Donley, Minaspi Bantawa, Emanuela Del Gado

Summary: This study investigates the microscopic dynamics and macroscopic rheology of soft particulate gels through numerical simulations and experiments. By establishing a connection between time-resolved dynamic moduli and microstructural changes, the microscopic origin of nonlinear rheology is revealed.

JOURNAL OF RHEOLOGY (2022)

Article Chemistry, Physical

Stress-stress correlations reveal force chains in gels

H. A. Vinutha, Fabiola Doraly Diaz Ruiz, Xiaoming Mao, Bulbul Chakraborty, Emanuela Del Gado

Summary: We investigated the spatial correlations of microscopic stresses in soft particulate gels through 2D and 3D numerical simulations. By using a newly developed theoretical framework, we predicted the analytical form of stress-stress correlations in amorphous assemblies of athermal grains that acquire rigidity under an external load. These correlations exhibit a pinch-point singularity in Fourier space, resulting in long-range correlations and strong anisotropy in real space. Our analysis of model particulate gels showed that stress-stress correlations have similar characteristics to granular solids and can be used to identify force chains. We demonstrated that these correlations can distinguish between floppy and rigid gel networks and reflect changes in shear moduli and network topology during solidification.

JOURNAL OF CHEMICAL PHYSICS (2023)

Article Physics, Multidisciplinary

The hidden hierarchical nature of soft particulate gels

Minaspi Bantawa, Bavand Keshavarz, Michela Geri, Mehdi Bouzid, Thibaut Divoux, Gareth H. McKinley, Emanuela Del Gado

Summary: Soft particulate gels consist of a small amount of particulate matter dispersed in a continuous fluid phase. The mechanical response and gel elasticity are determined by the particle volume fraction. However, the diverse range of functional dependencies reported experimentally has made it difficult to identify general scaling laws.

NATURE PHYSICS (2023)

Article Chemistry, Multidisciplinary

Local Mechanism Governs Global Reinforcement of Nanofiller-Hydrogel Composites

Ippolyti Dellatolas, Minaspi Bantawa, Brian Damerau, Ming Guo, Thibaut Divoux, Emanuela Del Gado, Irmgard Bischofberger

Summary: We reveal the mechanism for the strong reinforcement of attractive nanofiller-hydrogel composites. The attractive interactions induce a local increase in the gel density around the nanofillers, which leads to the formation of a percolated network. This network constrains the gel displacement and enhances stress coupling, resulting in a global reinforcement of the composite.

ACS NANO (2023)

Editorial Material Chemistry, Physical

Slow dynamics in disordered materials across theory, experiments, and simulations

Emanuela Del Gado, Andrea Liu, C. Patrick Royall

JOURNAL OF CHEMICAL PHYSICS (2023)

Article Mechanics

Universal scaling of shear thickening transitions

Meera Ramaswamy, Itay Griniasty, Danilo B. Liarte, Abhishek Shetty, Eleni Katifori, Emanuela Del Gado, James P. Sethna, Bulbul Chakraborty, Itai Cohen

Summary: Nearly all dense suspensions undergo dramatic and abrupt thickening transitions in their flow behavior when sheared at high stresses. In this study, we propose a complete theory of viscosity and find that the viscosity of two different systems can be collapsed onto a single universal curve. By incorporating microscale particle interactions into a scaling variable, we gain insights into the fundamental physical aspects of shear thickening transition. This research is of great importance for understanding the rheological behavior of fluids.

JOURNAL OF RHEOLOGY (2023)

Article Chemistry, Physical

Ion Specificity of Confined Ion-Water Structuring and Nanoscale Surface Forces in Clays

Francis Dragulet, Abhay Goyal, Katerina Ioannidou, Roland J. -M. Pellenq, Emanuela Del Gado

Summary: Ion specificity and Hofmeister effects play an important role in hydrated clays, determining the swelling and shrinkage behaviors of soil and sediments. A computational study reveals that nanoscale confinement leads to ion-specific surface forces between clay particles. Increased confinement and surface charge densities result in deviations from bulk hydration shells and the formation of highly organized water-ion structures, leading to strong attractive interactions between charged surfaces.

JOURNAL OF PHYSICAL CHEMISTRY B (2022)

Article Physics, Multidisciplinary

Prestressed elasticity of amorphous solids

Shang Zhang, Ethan Stanifer, Vishwas V. Vasisht, Leyou Zhang, Emanuela Del Gado, Xiaoming Mao

Summary: Prestress in amorphous solids plays a significant role in their mechanical properties by encoding formation memory and affecting mechanical response. Using stress as the fundamental variable, a set of mathematical tools are developed to investigate the mechanical response of prestressed systems, which is particularly suitable for nonconservative systems. The study reveals that amorphous materials can exhibit drastically different mechanical responses at the same density due to nonconservative interactions evolving over time or different preparation protocols, which are not visible from the configurations of the network in the case of nonconservative interactions.

PHYSICAL REVIEW RESEARCH (2022)

Article Automation & Control Systems

Tuning of active disturbance rejection control for differentially flat systems under an ultimate boundedness analysis: a unified integer-fractional approach

Jeisson E. Otero-Leal, John Cortes-Romero, Efredy Delgado Aguilera, Felipe Galarza-Jimenez, Alexander Jimenez-Triana

Summary: This study applies the ADRC approach to a fractional-order system with a flat output and identifies conditions to establish an ultimate bound for a specific configuration of the system, compiling them into guidelines for tuning the observer implemented in the ADRC.

CONTROL THEORY AND TECHNOLOGY (2021)

暂无数据