Aggregate formation in fluids with bounded repulsive core and competing interactions

Malescio, G.; Sciortino, Francesco

doi:10.1016/j.molliq.2020.112601

Cited by 3 publications

(1 citation statement)

References 52 publications

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“…Due to the increase of the dipole interaction among the suspended magnetic additives, they can reversibly change the effective viscosity and modulus by forming a chain structure under an external magnetic field, showing a typical shear-thinning behavior [28]. Many groups have reported that the particles tend to form aggregates due to long-range attractions in system; subsequently the aggregates are disrupted under flow, resulting in a shear thinning behavior toward motion [29][30][31][32][33]. Chen et al [34] treated the MWNT with functionalized surfaces and controlled morphologies to form a silicon oil based rheological material.…”

Section: Introductionmentioning

confidence: 99%

Exploring the impact of CoFe2O4 additives morphology on the properties of a novel strain-rate sensitive composite material

Zhou¹,

Chen²,

Li³

et al. 2021

Smart Mater. Struct.

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Various additives in smart materials are attracting wide attention owing to the improved adaptable functions, such as the ferromagnetic additive. However, the effect of additives’ morphology is not well investigated, causing inconsistent phenomena reported for the same additive. In this work, the spherical and rod-shaped CoFe2O4 nanoparticles were prepared by varying the reaction process of solvothermal, and introduced as dispersed phases into strain rate-sensitive materials to fabricate new strain-rate sensitive composite materials. The influence of magnetic particle morphology on its rheological performance was investigated. The results showed that the strain-rate sensitive composites with rod-shaped CoFe2O4 (RCFO) have a higher storage modulus and viscosity than the ones with spherical CoFe2O4 (SCFO) nanoparticles. The relationship between shear rate and viscosity indicates that all samples exhibited significant shear thinning effects in the range of shear rates studied, and the RCFO nanoparticles are useful for achieving a higher viscosity in comparison to the SCFO nanoparticles at the same shear rate. This work proves that the morphology of additives plays an important role in adjusting the property of smart materials and is expected to present some principles to choose the suitable morphology of additives for the design of new magneto-rheological materials.

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Section: Introductionmentioning

confidence: 99%

Exploring the impact of CoFe2O4 additives morphology on the properties of a novel strain-rate sensitive composite material

Zhou¹,

Chen²,

Li³

et al. 2021

Smart Mater. Struct.

View full text Add to dashboard Cite

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Self-assembly of quasicrystals and their approximants in fluids with bounded repulsive core and competing interactions

Malescio

Sciortino

2022

Journal of Molecular Liquids

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Thermodynamic Signatures of Structural Transitions and Dissociation of Charged Colloidal Clusters: A Parallel Tempering Monte Carlo Study

Prudente

Marques

2022

Molecules

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Computational simulation of colloidal systems make use of empirical interaction potentials that are founded in well-established theory. In this work, we have performed parallel tempering Monte Carlo (PTMC) simulations to calculate heat capacity and to assess structural transitions, which may occur in charged colloidal clusters whose effective interactions are described by a sum of pair potentials with attractive short-range and repulsive long-range components. Previous studies on these systems have shown that the global minimum structure varies from spherical-type shapes for small-size clusters to Bernal spiral and “beaded-necklace” shapes at intermediate and larger sizes, respectively. In order to study both structural transitions and dissociation, we have organized the structures appearing in the PTMC calculations by three sets according to their energy: (i) low-energy structures, including the global minimum; (ii) intermediate-energy “beaded-necklace” motifs; (iii) high-energy linear and branched structures that characterize the dissociative clusters. We observe that, depending on the cluster, either peaks or shoulders on the heat–capacity curve constitute thermodynamics signatures of dissociation and structural transitions. The dissociation occurs at T=0.20 for all studied clusters and it is characterized by the appearance of a significant number of linear structures, while the structural transitions corresponding to unrolling the Bernal spiral are quite dependent on the size of the colloidal system.

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Aggregate formation in fluids with bounded repulsive core and competing interactions

Cited by 3 publications

References 52 publications

Exploring the impact of CoFe2O4 additives morphology on the properties of a novel strain-rate sensitive composite material

Exploring the impact of CoFe2O4 additives morphology on the properties of a novel strain-rate sensitive composite material

Self-assembly of quasicrystals and their approximants in fluids with bounded repulsive core and competing interactions

Thermodynamic Signatures of Structural Transitions and Dissociation of Charged Colloidal Clusters: A Parallel Tempering Monte Carlo Study

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