Temperature modulated polymer nanoparticle bonding: A numerical and experimental study

Wilson, José Francisco; Trunov, Dan; Šrom, Ondřej; Štětina, Jiřı́; Hassouna, Fatima; Košek, Juraj; Šoóš, Miroslav

doi:10.1016/j.colsurfa.2020.125010

Cited by 3 publications

(13 citation statements)

References 47 publications

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“…Moreover, in our previous articles, we identified the relation between temperature, softness of the polymers, and their adhesive properties. 15 Particularly, when the system temperature (T) approaches the T g of polymers, the material experiences softening, which leads to an increase in adhesion between the nanoparticle surfaces due to an increase in surface contact area and stickiness of the material. The characterization of this complex mechanism is not straightforward, especially when simulating multibody systems that contain a large amount of particles that interact in a fluid environment.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The remaining forces, van der Waals attraction and contact forces, were characterized and modeled using the DEM features, similar to our previous work. 15 A scheme of the developed model in terms of force (F) versus particle overlap (δ) for the slow approach and detachment of particles is presented in Figure 2.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Moreover, in previous articles, we have found a direct relation between interparticle adhesion and the size of formed nanoparticle aggregates. 15,27,30 Using the previously described numerical tools, the relationship for the adhesive force between nanoparticles and the size of the formed fractal aggregates will be investigated under various shear flow conditions. Particularly, three hypotheses will be studied in order to understand the evolution of aggregate size with the shear rate at temperatures above the polymer shell T g .…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The material properties used for this research were chosen according to the literature data and previously published work. 15 For each simulation, the size of the formed aggregates was measured as an average of the population at steady state according to…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…In spite of the strong dependency between the strength of the polymer NP bond and temperature, there is evidence from previous work that the shear rate also plays a critical role when temperatures are above the T g of the polymer. 15 Particularly, it was observed that the NP bond strength decreases when the polymer is in a viscous state as the applied shear rate increases, suggesting a local shear-thinning effect on the surface of NPs. In this work, we intend to study and validate this hypothesis with experimental data supported by the numerical simulations.…”

Section: ■ Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Study of the Shear-Thinning Effect between Polymer Nanoparticle Surfaces during Shear-Induced Aggregation

Wilson

Zahradník

Šrom

et al. 2021

Ind. Eng. Chem. Res.

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In this research, we studied the impact of material fusion as an adhesion mechanism on the size and structure of fractal aggregates formed during shear aggregation of fully destabilized polymer nanoparticles (NPs). The nanoparticles have a core–shell structure, where the core is composed of poly(methyl methacrylate) (PMMA) and the shell consists of a combination of PMMA and polybutyl acrylate (PBA). Due to significantly different glass transition temperatures (T g ’s) of these polymers, the core acts as a hard sphere, while the presence of PBA in the shell gives the surface a soft character. By varying the system temperature, material fusion is induced between the particles in contact. The strength of the formed physical bond is tested under various shear rate conditions. It was found that the increase in temperature leads to an increase in aggregate size, caused by an increase in adhesion between NP surfaces. This phenomenon occurs due to a material softening of the polymer shell triggered by the increase in temperature, resulting in the formation of a viscous sticky surface. Additionally, it was observed that at temperatures above the T g of the polymer composing the shell, the increase in the shear rate causes a reduction of the interparticle contact strength suggesting a shear-thinning effect during contact. The interplay between these two contradicting mechanisms determines the final mechanical properties of produced material.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Study of the Shear-Thinning Effect between Polymer Nanoparticle Surfaces during Shear-Induced Aggregation

Wilson

Zahradník

Šrom

et al. 2021

Ind. Eng. Chem. Res.

Self Cite

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Effective lipase immobilization on crosslinked functional porous polypyrrole aggregates

Bharati

Bao

Trunov

et al. 2023

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Modeling Food Particle Systems: A Review of Current Progress and Challenges

Fries

2021

Annu. Rev. Chem. Biomol. Eng.

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For many years, food engineers have attempted to describe physical phenomena such as heat and mass transfer in food via mathematical models. Still, the impact and benefits of computer-aided engineering are less established in food than in most other industries today. Complexity in the structure and composition of food matrices are largely responsible for this gap. During processing of food, its temperature, moisture, and structure can change continuously, along with its physical properties. We summarize the knowledge foundation, recent progress, and remaining limitations in modeling food particle systems in four relevant areas: flowability, size reduction, drying, and granulation and agglomeration. Our goal is to enable researchers in academia and industry dealing with food powders to identify approaches to address their challenges with adequate model systems or through structural and compositional simplifications. With advances in computer simulation capacity, detailed particle-scale models are now available for many applications. Here, we discuss aspects that require further attention, especially related to physics-based contact models for discrete-element models of food particle systems. Expected final online publication date for the Annual Review of Chemical and Biomolecular Engineering, Volume 12 is June 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Temperature modulated polymer nanoparticle bonding: A numerical and experimental study

Cited by 3 publications

References 47 publications

Study of the Shear-Thinning Effect between Polymer Nanoparticle Surfaces during Shear-Induced Aggregation

Study of the Shear-Thinning Effect between Polymer Nanoparticle Surfaces during Shear-Induced Aggregation

Effective lipase immobilization on crosslinked functional porous polypyrrole aggregates

Modeling Food Particle Systems: A Review of Current Progress and Challenges

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