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Hiroyuki Kagami - One of the best experts on this subject based on the ideXlab platform.
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Impact of the Marangoni effect on thin film thickness profile after drying of polymer solution coated on a Flat Substrate
Proceedings of the 12th Asia Pacific Physics Conference (APPC12), 2014Co-Authors: Hiroyuki KagamiAbstract:The drying of polymer solution coated on a Flat Substrate is important in various industrial applications. We have proposed and subsequently modified a model of this drying process for Flat polymer thin film fabrication. In this study, we incorporate the Marangoni effect as pseudo-negative diffusion at an upper gas-liquid interface into the existing model. Through numerical simulation based on the modified model, we demonstrate that the solute at the upper gas-liquid interface is attracted more strongly to the edge due to the Marangoni effect.
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Impact of the Marangoni effect on the polymer thin film thickness profile after drying polymer solution coated on a Flat Substrate
Proceedings of SPIE, 2013Co-Authors: Hiroyuki KagamiAbstract:Drying process of polymer solution coated on a Flat Substrate is very important in various industrial applications. Then we have proposed and modified a model of drying process of polymer solution coated on a Flat Substrate for Flat polymer film fabrication. In the previous study, we added Marangoni effect as pseudo-negative diffusion on an upper gas-liquid interface to the former model. And we saw through numerical simulation of the modified model that solute on upper gas-liquid interface was attracted more strongly to the edge due to Marangoni effect. In this study, we show that this effect is remarkable on upper gas-liquid interface, while the effect extends to sufficiently inside of the polymer solution film.
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Thickness control of a thin film after drying through thermal and evaporative management in drying process of a polymer solution coated on a Flat Substrate: Application of the dynamical model of the drying process
Bioelectronics Biomedical and Bioinspired Systems V; and Nanotechnology V, 2011Co-Authors: Hiroyuki Kagami, Hiroshi KubotaAbstract:We have proposed and modified a model of drying process of polymer solution coated on a Flat Substrate for Flat polymer film fabrication supposing resist coating process in semiconductor engineering process and so on. And we have clarified dependence of distribution of polymer molecules on a Flat Substrate on a various parameters based on analysis of many numerical simulations of the model. Then we applied the model to thickness control of a thin film after drying through thermal management. But minute thickness control of a thin film after drying was not enough and more minute thickness control of it was desired. Therefore, in this study, we add evaporative management for more minute thickness control of a thin film after drying. As a result, thickness control of a thin film after drying in drying process of a polymer solution coated on a Flat Substrate can be improved further through adding evaporative operations to thermal operations artificially and instantaneously depending on solute's distribution during drying.
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A dynamical model of drying process of a polymer solution having plural solvents and plural solutes (polymers) coated on a Flat Substrate for a Flat and homogeneous polymer film fabrication
Physica Status Solidi (c), 2010Co-Authors: Hiroyuki Kagami, Hiroshi KubotaAbstract:Flat and homogeneous polymer film fabrication such as resist coating in photo lithography process is very important for minute fabrication. In many cases, a polymer solution having plural solvents and plural solutes (polymers) is generally used there. So we modify the former dynamical model of drying process of polymer solution coated on a Flat Substrate for Flat and homogeneous polymer film fabrication so as to deal with drying process of solution having plural solutes and plural solvents. As a result, we see that when there are over two kinds of solvents and over two kinds of solutes, solute's distribution after drying obeys the mean value of over two kinds of solvents' parameters through numerical simulations of the modified model. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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Applying the dynamical model of drying process of a polymer solution coated on a Flat Substrate to effects of bumpy Substrate
Proceedings of SPIE, 2010Co-Authors: Hiroyuki Kagami, Hiroshi KubotaAbstract:We apply the former general dynamical model of drying process of polymer solution coated on a Flat Substrate for Flat polymer film fabrication to concrete detailed subjects. Concretely we apply the model to effects of a bumpy Substrate as an example. We understand that a humpy structure on a Substrate does not affect nearly solute's distribution after drying because effects of diffusion around the hump are sufficiently effective as far as the hump interfere with diffusion. We also understand that when the beginning time of special vaporization near a hump is earlier, solute's distribution after drying except for at the edge's region is thinner a little because leveling including the edge's region by diffusion is more effective.
Wenping Song - One of the best experts on this subject based on the ideXlab platform.
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yield inception of a soft coating on a Flat Substrate indented by a rigid sphere
Surface & Coatings Technology, 2014Co-Authors: Andrey Ovcharenko, Wenping Song, I Etsion, Frank E TalkeAbstract:Abstract The yield inception of a deformable half space covered by a soft coating and indented by a rigid sphere is studied using the finite element method. A soft coating parameter, which controls the yield behavior of this problem, is defined. Dimensionless empirical expressions for the critical load, critical contact area and critical interference at yield inception are derived as functions of the dimensionless soft coating parameter. Three different locations of the yield inception of the coated system are observed. A comparison of yield inception behavior for an uncoated Substrate and Substrates with soft and hard coatings is made. A minimum value of dimensionless coating thickness, which is required to protect the Substrate from yielding, is proposed. It is shown that a coating with low Young's modulus and high yield strength is most desirable for protecting the Substrate against yielding.
Andrey Ovcharenko - One of the best experts on this subject based on the ideXlab platform.
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quantifying lubricant droplet spreading on a Flat Substrate using molecular dynamics
Applied Physics Letters, 2014Co-Authors: Brooklyn A Noble, Andrey Ovcharenko, Bart RaeymaekersAbstract:Understanding the physical behavior of polymer-based lubricants on the nanoscale is of critical importance to a myriad of engineering applications and devices. We have used molecular dynamics simulations to quantitatively evaluate the physical mechanisms underlying perfluoropolyether lubricant spreading on a solid Substrate. We quantify the effect of molecular mass, molecule length, and lubricant and Substrate functional end groups on lubricant spreading. The results show that lubricant functional end groups play a critical role in lubricant spreading on the nanoscale. Lubricant spreading increases with increasing molecule length for lubricant with functional end groups, but decreases with the increase in molecule length for lubricant without functional end groups. In the former case, the fraction of the lubricant chain that is functional is the primary driving factor for lubricant spreading, while in the latter case, the molecular mass is most important. For both lubricants with and without functional end groups, spreading is inhibited by molecule entanglement beyond a critical molecule length, and spreading becomes independent of lubricant functional end groups and molecular mass.
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yield inception of a soft coating on a Flat Substrate indented by a rigid sphere
Surface & Coatings Technology, 2014Co-Authors: Andrey Ovcharenko, Wenping Song, I Etsion, Frank E TalkeAbstract:Abstract The yield inception of a deformable half space covered by a soft coating and indented by a rigid sphere is studied using the finite element method. A soft coating parameter, which controls the yield behavior of this problem, is defined. Dimensionless empirical expressions for the critical load, critical contact area and critical interference at yield inception are derived as functions of the dimensionless soft coating parameter. Three different locations of the yield inception of the coated system are observed. A comparison of yield inception behavior for an uncoated Substrate and Substrates with soft and hard coatings is made. A minimum value of dimensionless coating thickness, which is required to protect the Substrate from yielding, is proposed. It is shown that a coating with low Young's modulus and high yield strength is most desirable for protecting the Substrate against yielding.
Frank E Talke - One of the best experts on this subject based on the ideXlab platform.
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yield inception of a soft coating on a Flat Substrate indented by a rigid sphere
Surface & Coatings Technology, 2014Co-Authors: Andrey Ovcharenko, Wenping Song, I Etsion, Frank E TalkeAbstract:Abstract The yield inception of a deformable half space covered by a soft coating and indented by a rigid sphere is studied using the finite element method. A soft coating parameter, which controls the yield behavior of this problem, is defined. Dimensionless empirical expressions for the critical load, critical contact area and critical interference at yield inception are derived as functions of the dimensionless soft coating parameter. Three different locations of the yield inception of the coated system are observed. A comparison of yield inception behavior for an uncoated Substrate and Substrates with soft and hard coatings is made. A minimum value of dimensionless coating thickness, which is required to protect the Substrate from yielding, is proposed. It is shown that a coating with low Young's modulus and high yield strength is most desirable for protecting the Substrate against yielding.
I Etsion - One of the best experts on this subject based on the ideXlab platform.
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yield inception of a soft coating on a Flat Substrate indented by a rigid sphere
Surface & Coatings Technology, 2014Co-Authors: Andrey Ovcharenko, Wenping Song, I Etsion, Frank E TalkeAbstract:Abstract The yield inception of a deformable half space covered by a soft coating and indented by a rigid sphere is studied using the finite element method. A soft coating parameter, which controls the yield behavior of this problem, is defined. Dimensionless empirical expressions for the critical load, critical contact area and critical interference at yield inception are derived as functions of the dimensionless soft coating parameter. Three different locations of the yield inception of the coated system are observed. A comparison of yield inception behavior for an uncoated Substrate and Substrates with soft and hard coatings is made. A minimum value of dimensionless coating thickness, which is required to protect the Substrate from yielding, is proposed. It is shown that a coating with low Young's modulus and high yield strength is most desirable for protecting the Substrate against yielding.