Control of the morphology of waterborne nanocomposite films

Grillet, Anne‐Cécile; Brunel, S.; Chevalier, Yves; Usoni, Sandra; Ansanay-Alex, Valérie; Allemand, J.

doi:10.1002/pi.1433

Cited by 27 publications

(28 citation statements)

References 43 publications

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“…An early example of stratification via a sedimentation mechanism in a colloidal mixture was reported by Grillet et al 68 in mixtures of large polymer particles (360 nm diameter) and silica nanoparticles (18 nm). The silica aggregated to make larger clusters that sedimented during film formation as a result of being denser than the continuous water phase.…”

Section: Sedimentation-driven Stratificationmentioning

confidence: 96%

A critical and quantitative review of the stratification of particles during the drying of colloidal films

Schulz

Keddie

2018

Soft Matter

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For a wide range of applications, films are deposited from colloidal particles suspended in a volatile liquid. There is burgeoning interest in stratifying colloidal particles into separate layers within the final dry film to impart properties at the surface different to the interior. Here, we outline the mechanisms by which colloidal mixtures can stratify during the drying process. The problem is considered here as a three-way competition between evaporation of the continuous liquid, sedimentation of particles, and their Brownian diffusion. In particle mixtures, the sedimentation of larger or denser particles offers one means of stratification. When the rate of evaporation is fast relative to diffusion, binary mixtures of large and small particles can stratify with small particles on the top, according to physical models and computer simulations. We compare experimental results found in the scientific literature to the predictions of several recent models in a quantitative way. Although there is not perfect agreement between them, some general trends emerge in the experiments, simulations and models. The stratification of small particles on the top of a film is favoured when the colloidal suspension is dilute but when both the concentration of the small particles and the solvent evaporation rate are sufficiently high. A higher particle size ratio also favours stratification by size. This review points to ways that microstructures can be designed and controlled in colloidal materials to achieve desired properties.

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Section: Sedimentation-driven Stratificationmentioning

confidence: 96%

A critical and quantitative review of the stratification of particles during the drying of colloidal films

Schulz

Keddie

2018

Soft Matter

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“…Due to the presence of the ionisable groups, and to the silanol groups on the silica surface which have the same function of charge stabilisation, the structure of these solutions is pH-and electrolyte responsive. We will see here that the final structure of the silica particles embedded in the polymer matrix can be controlled via the physico-chemical parameters of the solution [22][23][24].…”

Section: Sample Preparationmentioning

confidence: 99%

Aggregation of colloidal nanoparticles in polymer matrices

2006

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Colloidal nanoparticles may possess many functional properties, whose nature may be electronic, chemical, biological, mechanical, etc. It is often advantageous to incorporate them into a matrix material, e.g. a polymer solution or melt, or an elastomer, in order to obtain a 'nanomaterial' with additional properties brought in by the filler particles. One of the basic but nonetheless crucial properties is the mechanical strength of such polymer nanocomposites, whose rheological (or mechanical) properties are usually better than those of the pure matrix.The precise origin of this mechanical reinforcement effect, however, remains unclear.In this context, some recent studies of the structure and mechanical properties of a special type of nanocomposites are reviewed here. In silica-latex systems, a latex film with silica inclusions is formed from a colloidal solution of both components. During drying of the solution, the formation of silica domains can be controlled via the physico-chemical properties of the solution. Well-defined silica aggregates embedded in a polymer matrix can be generated, and the mechanical properties of the resulting nanocomposite have been shown to be directly correlated to the average structure. We believe that the fine-tuning of the structure of the filler phase opens new perspectives for systematic studies of the reinforcement effect, e.g. by modifying filler-polymer interfacial properties at fixed structure, or by generating original structures. Figures: 10

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“…Numerous reports on polymer-layered silicate nanocomposite materials have been found in the review papers [1,2]. In comparison, limited studies on silica nanoparticles-polymer composite materials of silicapolystyrene [3,4], silica-poly(ethyl-acrylate) [5], silica-nylon-6 [6,7], silica-latex [8] have been reported; although there are many * Corresponding author. Fax: +91 278 2567562.…”

Section: Introductionmentioning

confidence: 96%