The effect of inorganic particles on slot die coating of poly(vinyl alcohol) solutions

Chu, Wen-Bing; Yang, Jiawei; Wang, Yu-Chin; Liu, Ta‐Jo; Tiu, Carlos; Guo, Jian

doi:10.1016/j.jcis.2005.10.056

Cited by 53 publications

(27 citation statements)

References 31 publications

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“…Chu et al . [17,18] analyzed the effects of adding silica and titanium oxide particles to polyvinyl alcohol (PVA) solutions and found that owing to the adsorption of PVA molecules onto the particles, the operating windows can be effectively expanded. Yamamura et al .…”

Section: Introductionmentioning

confidence: 99%

Slot die coating of dilute suspensions

Lin

Chu

Liu

2008

Asia-Pacific J Chem Eng

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An experimental study was carried out to investigate slot die coating of dilute suspensions. Polymethyl methacrylate (PMMA) particles of different sizes were added to glycerol solutions as test fluids. The coating flow experiment was performed on a lab coater. The operating window, which is a domain in which only a stable and uniform coating solution is possible, was determined experimentally. It was found that adding particles has little effect on the physical properties of glycerol solutions, as only the fluid viscosity increases slightly. Two coating defects are commonly observed; ribbing which is caused by flow instability refers to lateral waves on the coated surface, and air entrainment which implies that air bubbles are trapped in the coating solution. Adding particles has little effect on the operating window if the coating defect is ribbing. However, the operating window can be expanded substantially if the coating defect is air entrainment. Higher the particle concentration, or the smaller the particle size, more significant is the expansion of the operating window. The maximum coating speed may increase to 80% for high suspension particle density number. A previous study reported that there exists an optimal particle size which has the largest operating window for a given pure solution; this was not found in the present work. 

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Section: Introductionmentioning

confidence: 99%

Slot die coating of dilute suspensions

Lin

Chu

Liu

2008

Asia-Pacific J Chem Eng

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“…The experiments revealed that the particle number density, i.e., the number of particles per unit liquid volume, was the key physical factor to characterize the increase in onset velocity, suggesting that the wetting failure in the suspension involves interfacial contributions of each filler component. For dense suspensions showing a particular shear-thinning behavior at low shear rates, Chu and co-workers recently reported that the suspension characteristics significantly influences the onset of "break line" defect in slot-die coating systems (Chu et al, 2006). However, the previous experimental studies have been limited to relatively low Reynolds number flows.…”

Section: Introductionmentioning

confidence: 99%

Particle-assisted dynamic wetting in a suspension liquid jet impinged onto a moving solid at different flow rates

Yamamura

Matsunaga

Mawatari

et al. 2006

Chemical Engineering Science

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“…Also, the coating thickness is determined by flow rate and web speed rather than gap thickness, which facilitates the obtaining of a uniform and defect-free film. The optimum operating coating parameters have been investigated in [48]. The limits of the method have been studied by Lee et al [49].…”

Section: Deposition On the Current Collectormentioning

confidence: 99%

Technology of the Li-Ion Batteries

Julien¹,

Mauger²,

Vijh

et al. 2016

Lithium Batteries

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585reversible capacity measured after the first or second cycle of the half cell, since it is the capacity that can be delivered during the life of the battery. In any case, the coulombic efficiency after the two first cycles for a battery of interest (i.e., already commercialized or under investigation in research laboratories) is close to 100 %. Negative/Positive Capacity RatioThe negative electrode/positive electrode ratio N/P is also called the balance of the battery. To understand the importance of this parameter, let us first consider the case of a negative electrode with initial capacity 100 mAh with irreversible capacity 10 mAh. This means that, in an experience made on a cell with this electrode and Li-metal as the counter-electrode, the measurements have shown that the formation of the SEI has consumed 10 mAh, so that the capacity delivered by the electrode after formation of the SEI is 90 mAh. For this half-cell, the formation of the SEI has no consequence, and does not limit the capacity of the half-cell, because the metalLi is a reservoir that can provide as much of Li + ions as we need. This, however, is not true for the full cell. To see the effect, let us consider now the full cell with this negative electrode, and a positive electrode with an initial capacity 100 mAh and irreversible capacity 20 mAh, so that its reversible capacity is 80 mAh. During the first charge, the capacity of the positive electrode is just sufficient to allow for the formation of the SEI that consumes 10 mAh, plus fully charge the negative electrode with an amount of Li + ions corresponding to a capacity of 90 mAh. Upon discharging, these Li + ions will be delivered by the negative electrode to the positive electrode, so that only the amount of lithium inside the positive electrode now corresponds to a capacity of 100-10 ¼ 90 mAh. However, a part of them corresponding to the irreversible capacity 20 mAh will be trapped, so that the capacity of the battery will be 90-20 ¼ 70 mAh, while the negative electrode has a larger capacity. Therefore, the formation of the SEI has now contributed to a decrease of the reversible capacity of the full cell.It might be tempting to increase the amount of active product in the positive electrode to increase the capacity of the battery. However, this may be not a good idea. Let us assume for instance that we increase the capacity of the positive electrode by 50 %. Then the initial capacity of the positive electrode is 150 mAh, and the irreversible capacity is 30 mAh. During the first charge, 100 mAh out of the 150 mAh available will be delivered by the positive electrode like before. Actually, if the charge is stopped at this stage, then, during the first discharge, 90 mAh will return to the negative electrode. The amount of lithium that the positive electrode can deliver in the second charge corresponds to a capacity of 140-30 ¼ 110 mAh capacity available to proceed reversibly upon cycling, larger than the 90 mAh that the negative electrode can absorb, so that the reversible capacity is sim...

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The effect of inorganic particles on slot die coating of poly(vinyl alcohol) solutions

Cited by 53 publications

References 31 publications

Slot die coating of dilute suspensions

Slot die coating of dilute suspensions

Particle-assisted dynamic wetting in a suspension liquid jet impinged onto a moving solid at different flow rates

Technology of the Li-Ion Batteries

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