Preparation of two‐layer film having porous structure by emulsion blend technique

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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“…The film formation of an adhesive layer also relied on the sedimentation of colloidally unstable phase. 26…”

Section: Sedimentation-driven Stratificationmentioning

confidence: 99%

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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“…Sun et al [9] have prepared flexible, transparent, and conductive polymer blend coatings using the poly(3,4-ethylenedioxythiophene)=poly (styrenesulfonate) (PEDOT=PSS) gel particles as the filler. A two-layer film with the porous structure and tackiness= nontackiness asymmetric surfaces has been successfully prepared by Okubo and coworkers, [10] which is considered as the preparation approach of a high-grade medical adhesive tape. In other applications where the products are used in the form of latexes, latex blends perform equally well.…”

Section: Introductionmentioning

confidence: 99%

Influence of Emulsifiers on Acrylate Latex Blends

Zhai

Niannian

et al. 2013

Journal of Dispersion Science and Technology

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The poly(methyl methacrylate/butyl acrylate/acrylic acid) [P(MMA/BA/AA)] and poly (styrene/ butyl acrylate/acrylic acid) [P(St/BA/AA)] latexes were synthesized using the emulsifier octylphenol polyoxyethylene(10) ether (OP-10) and ammonium sulfate allyloxy nonylphenoxy poly(ethyleneoxy)(10) ether(DNS-86). The optimum amount of OP-10 and DNS-86 was 1.5% and 2.5% respectively. The P(MMA/BA/AA) and P(St/BA/AA) latex containing 1.5% OP-10 or 2.5% DNS-86 were blended pairwise. The performances of latex blends and parent latexes as a function of emulsifiers content in parent latexes were determined. The results indicated that the stability of latex blends is favorable, and particle size distribution was more uniform and thermal stability was improved after blending.

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Preparation of two‐layer film having porous structure by emulsion blend technique

Cited by 2 publications

References 15 publications

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

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

Influence of Emulsifiers on Acrylate Latex Blends

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