The Experts below are selected from a list of 10611 Experts worldwide ranked by ideXlab platform
Robert A. Hayes - One of the best experts on this subject based on the ideXlab platform.
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Amorphous Fluoropolymers as insulators for reversible low-voltage electrowetting
Journal of Applied Physics, 2001Co-Authors: Emilie Seyrat, Robert A. HayesAbstract:Amorphous Fluoropolymers have been used as a hydrophobic “top coat” of insulating materials for electrowetting, to confer the reversibility required for practical applications. The electrical properties of such Fluoropolymers (in particular breakdown voltages of less than 20 V/μm) are often implicated in poor electrowetting performance. However, we have recently found that the intrinsic electrical properties, including the breakdown voltage, of appropriately prepared Fluoropolymer coatings are sufficient to allow the amorphous Fluoropolymer to function both as the insulator and hydrophobic surface for electrowetting. A typical electrowetting material system is then reduced to the basic material components of electrode, insulator, and conducting liquid. This simplicity facilitates both the fabrication of electrowetting devices, the soluble Fluoropolymer insulator being directly wet coated onto the electrode materials, as well as the study of charging mechanisms. Reversible electrowetting on insulators thin...
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Amorphous Fluoropolymers as insulators for reversible low-voltage electrowetting
Journal of Applied Physics, 2001Co-Authors: Emilie Seyrat, Robert A. HayesAbstract:Amorphous Fluoropolymers have been used as a hydrophobic "top coat" of insulating materials for electrowetting, to confer the reversibility required for practical applications. The electrical properties of such Fluoropolymers (in particular breakdown voltages of less than 20 V/mum) are often implicated in poor electrowetting performance. However, we have recently found that the intrinsic electrical properties, including the breakdown voltage, of appropriately prepared Fluoropolymer coatings are sufficient to allow the amorphous Fluoropolymer to function both as the insulator and hydrophobic surface for electrowetting. A typical electrowetting material system is then reduced to the basic material components of electrode, insulator, and conducting liquid. This simplicity facilitates both the fabrication of electrowetting devices, the soluble Fluoropolymer insulator being directly wet coated onto the electrode materials, as well as the study of charging mechanisms. Reversible electrowetting on insulators thinner than 1 mum and at less than 50 V is also routinely achievable. (C) 2001 American Institute of Physics.
Qingmin Chen - One of the best experts on this subject based on the ideXlab platform.
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research on the icephobic properties of Fluoropolymer based materials
Applied Surface Science, 2011Co-Authors: Shuqing Yang, Qingjun Wang, Qingmin ChenAbstract:Abstract Fluoropolymer, because of the extremely low surface energy, could be non-stick to water and thus could be a good candidate as anti-icing materials. In this paper, the icephobic properties of a series of Fluoropolymer materials including pristine PTFE plates (P-PTFE), sandblasted PTFE plates (SB-PTFE), two PTFE coatings (SNF-1 and SNF-CO1), a fluorinated room-temperature vulcanized silicone rubber coating (F-RTV) and a fluorinated polyurethane coating (F-PU) have been investigated by using SEM, XPS, ice adhesion strength (tensile and shear) tests, and static and dynamic water contact angle analysis. Results show that the Fluoropolymer material with a smooth surface can significantly reduce ice adhesion strength but do not show obvious effect in reducing ice accretion at −8 °C. Fluoropolymers with sub-micron surface structures can improve the hydrophobicity at normal temperature. It leads to an efficient reduction in the ice accretion on the surface at −8 °C, due to the superhydrophobicity of the materials. But the hydrophobicity of this surface descends at a low temperature with high humidity. Consequently, once ice layer formed on the surface, the ice adhesion strength enhanced rapidly due to the existence of the sub-micron structures. Ice adhesion strength of Fluoropolymers is highly correlated to CA reduction observed when the temperature was changed from 20 °C to −8 °C. This property is associated with the submicron structure on the surface, which allows water condensed in the interspace between the sub-micron protrudes at a low temperature, and leads to a reduced contact angle, as well as a significantly increased ice adhesion strength.
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Research on the icephobic properties of Fluoropolymer-based materials
Applied Surface Science, 2011Co-Authors: Shuqing Yang, Qiang Xia, Jian Xue, Lin Zhu, Qingjun Wang, Qingmin ChenAbstract:Fluoropolymer, because of the extremely low surface energy, could be non-stick to water and thus could be a good candidate as anti-icing materials. In this paper, the icephobic properties of a series of Fluoropolymer materials including pristine PTFE plates (P-PTFE), sandblasted PTFE plates (SB-PTFE), two PTFE coatings (SNF-1 and SNF-CO1), a fluorinated room-temperature vulcanized silicone rubber coating (F-RTV) and a fluorinated polyurethane coating (F-PU) have been investigated by using SEM, XPS, ice adhesion strength (tensile and shear) tests, and static and dynamic water contact angle analysis. Results show that the Fluoropolymer material with a smooth surface can significantly reduce ice adhesion strength but do not show obvious effect in reducing ice accretion at -8 ??C. Fluoropolymers with sub-micron surface structures can improve the hydrophobicity at normal temperature. It leads to an efficient reduction in the ice accretion on the surface at -8 ??C, due to the superhydrophobicity of the materials. But the hydrophobicity of this surface descends at a low temperature with high humidity. Consequently, once ice layer formed on the surface, the ice adhesion strength enhanced rapidly due to the existence of the sub-micron structures. Ice adhesion strength of Fluoropolymers is highly correlated to CA reduction observed when the temperature was changed from 20 ??C to -8 ??C. This property is associated with the submicron structure on the surface, which allows water condensed in the interspace between the sub-micron protrudes at a low temperature, and leads to a reduced contact angle, as well as a significantly increased ice adhesion strength. ?? 2011 Published by Elsevier B.V. All rights reserved.
Emilie Seyrat - One of the best experts on this subject based on the ideXlab platform.
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Amorphous Fluoropolymers as insulators for reversible low-voltage electrowetting
Journal of Applied Physics, 2001Co-Authors: Emilie Seyrat, Robert A. HayesAbstract:Amorphous Fluoropolymers have been used as a hydrophobic “top coat” of insulating materials for electrowetting, to confer the reversibility required for practical applications. The electrical properties of such Fluoropolymers (in particular breakdown voltages of less than 20 V/μm) are often implicated in poor electrowetting performance. However, we have recently found that the intrinsic electrical properties, including the breakdown voltage, of appropriately prepared Fluoropolymer coatings are sufficient to allow the amorphous Fluoropolymer to function both as the insulator and hydrophobic surface for electrowetting. A typical electrowetting material system is then reduced to the basic material components of electrode, insulator, and conducting liquid. This simplicity facilitates both the fabrication of electrowetting devices, the soluble Fluoropolymer insulator being directly wet coated onto the electrode materials, as well as the study of charging mechanisms. Reversible electrowetting on insulators thin...
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Amorphous Fluoropolymers as insulators for reversible low-voltage electrowetting
Journal of Applied Physics, 2001Co-Authors: Emilie Seyrat, Robert A. HayesAbstract:Amorphous Fluoropolymers have been used as a hydrophobic "top coat" of insulating materials for electrowetting, to confer the reversibility required for practical applications. The electrical properties of such Fluoropolymers (in particular breakdown voltages of less than 20 V/mum) are often implicated in poor electrowetting performance. However, we have recently found that the intrinsic electrical properties, including the breakdown voltage, of appropriately prepared Fluoropolymer coatings are sufficient to allow the amorphous Fluoropolymer to function both as the insulator and hydrophobic surface for electrowetting. A typical electrowetting material system is then reduced to the basic material components of electrode, insulator, and conducting liquid. This simplicity facilitates both the fabrication of electrowetting devices, the soluble Fluoropolymer insulator being directly wet coated onto the electrode materials, as well as the study of charging mechanisms. Reversible electrowetting on insulators thinner than 1 mum and at less than 50 V is also routinely achievable. (C) 2001 American Institute of Physics.
Lumin Li - One of the best experts on this subject based on the ideXlab platform.
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Modification of Fluoropolymer surfaces with electronically conductive polymers
Synthetic Metals, 1994Co-Authors: Leon S. Van Dyke, Junting Lei, Charles J. Brumlik, Wenbin Liang, Zengqi Yu, Charles R. Martin, Lumin LiAbstract:We describe methods for coating Fluoropolymer surfaces with thin films of electronically conductive polymers. Modification of the Fluoropolymer surface prior to coating with conductive polymer is necessary to achieve good adhesion between the Fluoropolymer membrane and the conductive polymer coating. We describe four different procedures for modifying the Fluoropolymer surface so as to promote strong adhesion. These procedures are based on a wet chemical treatment of the Fluoropolymer or on exposure of the Fluoropolymer surface to a hydrogen plasma, an ultraviolet lasr or an electron beam. Finally, we show that it is possible to 'write' patterns with the conductive polymer onto the Fluoropolymer surface. © 1994.
Shuqing Yang - One of the best experts on this subject based on the ideXlab platform.
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research on the icephobic properties of Fluoropolymer based materials
Applied Surface Science, 2011Co-Authors: Shuqing Yang, Qingjun Wang, Qingmin ChenAbstract:Abstract Fluoropolymer, because of the extremely low surface energy, could be non-stick to water and thus could be a good candidate as anti-icing materials. In this paper, the icephobic properties of a series of Fluoropolymer materials including pristine PTFE plates (P-PTFE), sandblasted PTFE plates (SB-PTFE), two PTFE coatings (SNF-1 and SNF-CO1), a fluorinated room-temperature vulcanized silicone rubber coating (F-RTV) and a fluorinated polyurethane coating (F-PU) have been investigated by using SEM, XPS, ice adhesion strength (tensile and shear) tests, and static and dynamic water contact angle analysis. Results show that the Fluoropolymer material with a smooth surface can significantly reduce ice adhesion strength but do not show obvious effect in reducing ice accretion at −8 °C. Fluoropolymers with sub-micron surface structures can improve the hydrophobicity at normal temperature. It leads to an efficient reduction in the ice accretion on the surface at −8 °C, due to the superhydrophobicity of the materials. But the hydrophobicity of this surface descends at a low temperature with high humidity. Consequently, once ice layer formed on the surface, the ice adhesion strength enhanced rapidly due to the existence of the sub-micron structures. Ice adhesion strength of Fluoropolymers is highly correlated to CA reduction observed when the temperature was changed from 20 °C to −8 °C. This property is associated with the submicron structure on the surface, which allows water condensed in the interspace between the sub-micron protrudes at a low temperature, and leads to a reduced contact angle, as well as a significantly increased ice adhesion strength.
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Research on the icephobic properties of Fluoropolymer-based materials
Applied Surface Science, 2011Co-Authors: Shuqing Yang, Qiang Xia, Jian Xue, Lin Zhu, Qingjun Wang, Qingmin ChenAbstract:Fluoropolymer, because of the extremely low surface energy, could be non-stick to water and thus could be a good candidate as anti-icing materials. In this paper, the icephobic properties of a series of Fluoropolymer materials including pristine PTFE plates (P-PTFE), sandblasted PTFE plates (SB-PTFE), two PTFE coatings (SNF-1 and SNF-CO1), a fluorinated room-temperature vulcanized silicone rubber coating (F-RTV) and a fluorinated polyurethane coating (F-PU) have been investigated by using SEM, XPS, ice adhesion strength (tensile and shear) tests, and static and dynamic water contact angle analysis. Results show that the Fluoropolymer material with a smooth surface can significantly reduce ice adhesion strength but do not show obvious effect in reducing ice accretion at -8 ??C. Fluoropolymers with sub-micron surface structures can improve the hydrophobicity at normal temperature. It leads to an efficient reduction in the ice accretion on the surface at -8 ??C, due to the superhydrophobicity of the materials. But the hydrophobicity of this surface descends at a low temperature with high humidity. Consequently, once ice layer formed on the surface, the ice adhesion strength enhanced rapidly due to the existence of the sub-micron structures. Ice adhesion strength of Fluoropolymers is highly correlated to CA reduction observed when the temperature was changed from 20 ??C to -8 ??C. This property is associated with the submicron structure on the surface, which allows water condensed in the interspace between the sub-micron protrudes at a low temperature, and leads to a reduced contact angle, as well as a significantly increased ice adhesion strength. ?? 2011 Published by Elsevier B.V. All rights reserved.
