Adsorption–stress relationship in drying of silica/PVA suspensions

Kim, Sun‐Hyung; Sung, Jang Hyun; Chun, Sangki; Ahn, Kyung Hyun; Lee, Seung Jong

doi:10.1016/j.jcis.2011.05.052

Cited by 10 publications

(9 citation statements)

References 37 publications

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“…Recently, Koga and Inasawa 52 demonstrated that partially saponified PVA suppressed cracking at lower polymer concentrations compared with fully saponified PVA, suggesting that functional groups alter the critical conditions of cracking. Their results are qualitatively consistent with the adsorption‐mediated cracking presented in this study because the partially saponified PVA contained fewer hydroxyl (OH) groups and was readily adsorbed on the surface of silica particles 33,52 . However, thus far, no theoretical framework has been developed to predict the critical cracking thicknesses for polymers with different functional groups.…”

Section: Resultssupporting

confidence: 86%

“…With increasing polymer adsorption amounts above Γ c , the capillary stress retained a constant value, whereas the polymer stress increased and eventually overcame the capillary stress, indicating a stress crossover at Γ ~ 1.2 mg‐PVA/m 2 ‐TiO 2 (Regime II). The constant capillary stress indicates no significant change in the particle packing structures, despite the common observation that adsorbing polymers induce steric repulsive forces between neighboring particles to alter the final packing of particles 33 . The residual polymer stress significantly increased as we further increased the adsorption amounts above the crossover point.…”

Section: Resultsmentioning

confidence: 88%

“…These discrepancies motivated the current investigation, wherein we demonstrate the multiple roles of polymeric additives in the cracking of drying colloidal suspensions. When polymer chains adsorb on particle surfaces, the polymers can act as a dispersant and stabilize the suspension through steric repulsive forces, thereby leading to homogenous close packing; thus, higher capillary stresses scaled on the surface tension divided by the radius of the free‐surface curvature 33 . Nonadsorbing polymer chains in bulk fluids can become entangled or even gel with the help of a cross‐linker, 34 both of which can increase elastic stresses as polymer networks span across the films.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption‐mediated nonlinearity of critical cracking thickness in drying nanoparticle–polymer suspensions

Yamamura

2021

AIChE Journal

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We examine the critical cracking thicknesses of as‐dried colloidal TiO2 suspensions containing water‐soluble polymeric additives, above which cracks spontaneously propagate. In contrast to common observations, the critical cracking thickness increases in a nonlinear, stepwise manner as increasing the concentration of the polymeric additive in the suspension. The critical thickness diverges when the polymer content increases above a certain threshold. We demonstrate that the first and second critical cracking thickness increments are attributable to the onset of polymer adsorption and a subsequent transition in the conformations of the adsorbing polymer chains, respectively. The critical thickness profiles with respect to normalized polymer adsorption amounts at different particle diameters converged into a single master curve. These results illustrate nontrivial evaporation processes in which the various roles of polymeric additives delay cracking into thicker films.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Adsorption‐mediated nonlinearity of critical cracking thickness in drying nanoparticle–polymer suspensions

Yamamura

2021

AIChE Journal

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“…17,36 Kim et al 26 investigated a relationship between the adsorption amount of PVA and the drying stress in silica/PVA suspensions. The adsorption amount of PVA was changed according to pH and mixing time.…”

Section: Resultsmentioning

confidence: 99%

Stress Development of Li-Ion Battery Anode Slurries during the Drying Process

Lim

Kim

Ahn

et al. 2015

Ind. Eng. Chem. Res.

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The effect of sodium carboxymethyl cellulose (CMC) and styrene butadiene rubber (SBR) on film formation was evaluated by analyzing both drying stress and pore size distribution. We discovered that the SBR in a graphite/SBR slurry filled the voids among the graphite particles with the increase in SBR concentration. In addition, the CMC in the graphite/CMC slurry was adsorbed onto the graphite surface, which caused the graphite particles to coalesce. In the graphite/CMC/SBR slurry, a large amount of SBR was needed to increase the mechanical strength of the film in the low concentration region of CMC. However, in high concentration region of CMC, the SBR did not affect the mechanical strength of the film any longer. On the basis of the drying stress measurements, we could draw a processing window map that clearly shows the effect of CMC and SBR on the mechanical strength of the film, which will be useful in the design of anode slurries.

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“…An aqueous dispersion of nano-silica and polyvinyl alcohol (PVA) was employed as a PNC solution model system. Two different PNC solutions with different amounts of adsorbed polymers on the NP surface were prepared by varying the stirring duration [ 30 , 32 ]. The temporal evolution of the NP structures were observed in situ during drying using the synchrotron vertical -small-angle X-ray scattering (SAXS) technique [ 23 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Role of Adsorbed Polymers on Nanoparticle Dispersion in Drying Polymer Nanocomposite Films

Kim

et al. 2021

Polymers

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Polymers adsorbed on nanoparticles (NPs) are important elements that determine the dispersion of NPs in polymer nanocomposite (PNC) films. While previous studies have shown that increasing the number of adsorbed polymers on NPs can improve their dispersion during the drying process, the exact mechanism remained unclear. In this study, we investigated the role of adsorbed polymers in determining the microstructure and dispersion of NPs during the drying process. Investigation of the structural development of NPs using the synchrotron vertical-small-angle X-ray scattering technique revealed that increasing polymer adsorption suppresses bonding between the NPs at later stages of drying, when they approach each other and come in contact. On the particle length scale, NPs with large amounts of adsorbed polymers form loose clusters, whereas those with smaller amounts of adsorbed polymers form dense clusters. On the cluster length scale, loose clusters of NPs with large amounts of adsorbed polymers build densely packed aggregates, while dense clusters of NPs with small amounts of adsorbed polymers become organized into loose aggregates. The potential for the quantitative control of NP dispersion in PNC films via modification of polymer adsorption was established in this study.

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Adsorption–stress relationship in drying of silica/PVA suspensions

Cited by 10 publications

References 37 publications

Adsorption‐mediated nonlinearity of critical cracking thickness in drying nanoparticle–polymer suspensions

Adsorption‐mediated nonlinearity of critical cracking thickness in drying nanoparticle–polymer suspensions

Stress Development of Li-Ion Battery Anode Slurries during the Drying Process

Role of Adsorbed Polymers on Nanoparticle Dispersion in Drying Polymer Nanocomposite Films

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