The effect of adsorption kinetics on film formation of silica/PVA suspension

Kim, Sun‐Hyung; Sung, Jang Hyun; Hur, Kang-Heon; Ahn, Kyung Hyun; Lee, Seung Jong

doi:10.1016/j.jcis.2009.12.046

Cited by 17 publications

(20 citation statements)

References 46 publications

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“…The stress of a drying film was measured in situ using classical cantilever technique [25,26]. The device has a drying chamber to control the required drying condition such as air flow, drying temperature and relative humidity.…”

Section: Drying Stressmentioning

confidence: 99%

“…The measured deflection was used to calculate the biaxial, in-plain stress, r using the formula introduced by Corcoran [27]. The details of the device, experimental procedure and formula can be found elsewhere [25,26]. It is to be noted that only an averaged stress can be determined with this method and the stress distribution is not considered.…”

Section: Drying Stressmentioning

confidence: 99%

“…We have studied drying behavior of silica/ PVA suspension [25,26] as a model particle/polymer system and found that the flocculated suspension forms a well dispersed film after drying, while well dispersed suspension results in poorly dispersed drying film, which arises because the adsorbed polymers play an important role in the evolution of dispersion stability during drying process [25]. More recently, as a motivation of this study, we observed that both the amount of polymer adsorption and the stress of dry film relate with mixing time in a similar way [26]. This prompted us to question what the origin of adsorption behavior is and whether there exists a universal behavior in film formation of silica/PVA suspensions.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption–stress relationship in drying of silica/PVA suspensions

Kim

Sung

Chun

et al. 2011

Journal of Colloid and Interface Science

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Section: Drying Stressmentioning

confidence: 99%

Section: Drying Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption–stress relationship in drying of silica/PVA suspensions

Kim

Sung

Chun

et al. 2011

Journal of Colloid and Interface Science

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“…In the case of a poor NP-polymer affinity, depletion attraction by non-adsorbed polymer or van der Walls attraction can result in NP aggregation in the solid film after drying 12,14,15 . Conversely, in case of a good affinity between NPs and the hosting polymer matrix, the polymers may adsorb on the NP surface and introduce a steric repulsion, thus prevent NP aggregates in the final solid film 12,16,17 .…”

Section: Introductionmentioning

confidence: 99%

Structural Development of Nanoparticle Dispersion during Drying in Polymer Nanocomposite Films

Kim

Hyun

Struth³

et al. 2016

Macromolecules

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Dispersions of nanoparticles (NPs) in a polymer matrix are a key element to set various properties of solution-cast polymer nanocomposite films. While the dispersion state of NPs in nanocomposite films has been extensively studied over the last decades, the structural development during drying and the relation of liquid and solid structure still remains poorly understood. In the present work, we study how NP dispersions develop during drying in polymer nanocomposite films, particularly focusing on the role of particle-polymer interaction in the structural development. Aqueous dispersions of nano-silica and poly(vinyl alcohol) are used as a model NP/polymer mixtures, where the particle-polymer interaction can systemically be varied via the pH. A novel vertical small angle X-ray scattering technique enables us to directly observe the development of NPs dispersion during drying. At a high pH 10, where silica particles have a poor affinity to PVA, SAXS intensity evolution shows phase separation during drying, resulting in the formation of dense aggregates of bare particles in the solid film. On the other hand, at a low pH 3, where silica particles have a good affinity with PVA, the SAXS data indicates a gradual densification of the NPs while maintaining a constant inter-particle distance, which is originating from adsorbed PVA. The resulting solid film after drying exhibits an improved dispersion of NPs. The evaluation of the inter-particle interaction suggests that the adsorbed polymer plays generally a key role in the uniform distribution of NPs in solid films, as it sterically stabilizes NPs over short ranges during all drying stages whereas depletion attraction dominates at longer ranges.

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“…Because pH of the suspension was initially pH 10, a 0.3 M HCl solution was gradually dropped into the suspension on the magnetic stirrer for the suspension pH 3. As time dependence was observed from the previous research (Kim et al 2010), all measurements were performed for the suspensions of strictly 24 h stirring at room temperature.…”

Section: Experimental Materialsmentioning

confidence: 99%

Particle Dispersion in Silica-Poly(vinyl alcohol) Coatings: Role of Particle-Polymer Interaction

et al. 2018

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Silica nanoparticle (SiNP)-poly(vinyl alcohol) (PVOH) coating is an important material system in paper coating applications, where particle distribution critically affects coating performance. In the present study, the authors investigated a role of physicochemical interaction between SiNP surface and PVOH chain in SiNP distribution in the coating layer, with a comparison of the suspension at pH 3 (good interaction) and pH 10 (poor interaction) as PVOH concentration was varied. Rheological properties and sedimentation behavior of the suspensions showed the dispersion stability of SiNP at pH 3 was improved by the addition of PVOH, whereas it was independent of the PVOH concentration at pH 10. Scanning electron microscopy and small angle x-ray scattering intensity of dried coating layer showed the uniform and dense structure with homogeneous distribution of SiNPs at pH 3, where spatial arrangement of SiNPs depended on the addition of PVOH. However, non-uniform and porous structures with SiNP aggregates were observed at pH 10, where the spatial arrangement of SiNPs was independent to the addition of PVOH. The stress development during drying of the coating suggested that the mechanical property was related to the spatial arrangement of individual SiNPs at pH 3, whereas to the distribution of SiNPs aggregates at pH 10.

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The effect of adsorption kinetics on film formation of silica/PVA suspension

Cited by 17 publications

References 46 publications

Adsorption–stress relationship in drying of silica/PVA suspensions

Adsorption–stress relationship in drying of silica/PVA suspensions

Structural Development of Nanoparticle Dispersion during Drying in Polymer Nanocomposite Films

Particle Dispersion in Silica-Poly(vinyl alcohol) Coatings: Role of Particle-Polymer Interaction

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