The Experts below are selected from a list of 6684 Experts worldwide ranked by ideXlab platform
Moon Kyu Kwak - One of the best experts on this subject based on the ideXlab platform.
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large area dual scale metal transfer by Adhesive Force
Small, 2009Co-Authors: Moon Kyu KwakAbstract:We report a large-area, dual-scale metal transfer method by using a difference in Adhesive Force. Rigiflex polyurethane acrylate (PUA) molds with engraved nanoscale patterns were used to transfer metal layers (Au or Al) to flexible polyethylene terephthalate (PET) substrate. Transfer process was performed sequentially for the metal layers on ridge and valley regions of the mold, resulting in a dual-scale metal transfer from a single master. A simple metal wire grid polarizer was fabricated and analyzed using this method.
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Large‐Area Dual‐Scale Metal Transfer by Adhesive Force
Small, 2009Co-Authors: Moon Kyu KwakAbstract:We report a large-area, dual-scale metal transfer method by using a difference in Adhesive Force. Rigiflex polyurethane acrylate (PUA) molds with engraved nanoscale patterns were used to transfer metal layers (Au or Al) to flexible polyethylene terephthalate (PET) substrate. Transfer process was performed sequentially for the metal layers on ridge and valley regions of the mold, resulting in a dual-scale metal transfer from a single master. A simple metal wire grid polarizer was fabricated and analyzed using this method.
Lei Jiang - One of the best experts on this subject based on the ideXlab platform.
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peach skin effect a quasi superhydrophobic state with high Adhesive Force
Chinese Science Bulletin, 2015Co-Authors: Xianyong Lu, Yanzi Wu, Chao Teng, Congcong Jiang, Lei JiangAbstract:The surface of a peach is known to exhibit special wettability and adhesion behaviors. We disclose that the peach surface is covered with long and short indumentums. The long indumentums are covered mainly with hydrophobic wax molecules, while the short indumentums are coated mostly with hydrophilic polysaccharides. Thus, the peach surface exhibits a quasi-superhydrophobic property and high Adhesive Force. A water droplet on the surface of a peach is a quasi-sphere, which is unable to roll off even when the peach is turned upside down. This is defined as the peach skin effect. We present that the quasi-superhydrophobic state with high Adhesive Force is attributed to the special coexisting Wenzel’s and Cassie’s state for water droplets, thus creating the strong interaction between the water droplet and surface.
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petal effect a superhydrophobic state with high Adhesive Force
Langmuir, 2008Co-Authors: Lin Feng, Yanan Zhang, Jinming Xi, Nu Wang, Lei JiangAbstract:Hierarchical micropapillae and nanofolds are known to exist on the petals' surfaces of red roses. These micro- and nanostructures provide a sufficient roughness for superhydrophobicity and yet at the same time a high Adhesive Force with water. A water droplet on the surface of the petal appears spherical in shape, which cannot roll off even when the petal is turned upside down. We define this phenomenon as the “petal effect” as compared with the popular “lotus effect”. Artificial fabrication of biomimic polymer films, with well-defined nanoembossed structures obtained by duplicating the petal's surface, indicates that the superhydrophobic surface and the Adhesive petal are in Cassie impregnating wetting state.
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application of superhydrophobic surface with high Adhesive Force in no lost transport of superparamagnetic microdroplet
Journal of the American Chemical Society, 2007Co-Authors: Xia Hong, Xuefeng Gao, Lei JiangAbstract:Due to the wide applications of magnetic nanomaterials in biology, pharmacy, and diagnostics, there is an increasing need for controlled transport of their small volumes of liquids. Here, we designed a simple, high-efficiency, and flexible method for reversibly oriented transport of superparamagnetic microdroplets with no lost volume by alternating magnetic fields. Superhydrophobic surfaces with high Adhesive Force played an important role, and the success of reversibly no lost transport also relied on the sensitive responsive property of the superparamagnetic microdroplet to applied magnetic fields. Such a magnetic-field-induced intelligent transport method would be especially helpful for many localized chemical or biological reactions, traced analysis, and in situ detection.
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super hydrophobic pdms surface with ultra low Adhesive Force
Macromolecular Rapid Communications, 2005Co-Authors: Xinjian Feng, Jinming Xi, Lin Feng, Jin Zhai, Lei JiangAbstract:Summary: Rough polydimethylsiloxane (PDMS) surface containing micro-, submicro- and nano-composite structures was fabricated using a facile one-step laser etching method. Such surface shows a super-hydrophobic character with contact angle higher than 160° and sliding angle lower than 5°, i.e. self-cleaning effect like lotus leaf. The wettabilities of the rough PDMS surfaces can be tunable by simply controlling the size of etched microstructures. The Adhesive Force between etched PDMS surface and water droplet is evaluated, and the structure effect is deduced by comparing it with those own a single nano- or micro-scale structures. This super-hydrophobic PDMS surface can be widely applied to many areas such as liquid transportation without loss, and micro-pump (creating pushing-Force) needless micro-fluidic devices. Etched PDMS surface containing micro-, submicro-, and nano-composite structures shows a self-cleaning effect with water CA as high as 162° and SA lower than 5°.
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Super‐Hydrophobic PDMS Surface with Ultra‐Low Adhesive Force
Macromolecular Rapid Communications, 2005Co-Authors: Xinjian Feng, Jinming Xi, Lin Feng, Jin Zhai, Lei JiangAbstract:Summary: Rough polydimethylsiloxane (PDMS) surface containing micro-, submicro- and nano-composite structures was fabricated using a facile one-step laser etching method. Such surface shows a super-hydrophobic character with contact angle higher than 160° and sliding angle lower than 5°, i.e. self-cleaning effect like lotus leaf. The wettabilities of the rough PDMS surfaces can be tunable by simply controlling the size of etched microstructures. The Adhesive Force between etched PDMS surface and water droplet is evaluated, and the structure effect is deduced by comparing it with those own a single nano- or micro-scale structures. This super-hydrophobic PDMS surface can be widely applied to many areas such as liquid transportation without loss, and micro-pump (creating pushing-Force) needless micro-fluidic devices. Etched PDMS surface containing micro-, submicro-, and nano-composite structures shows a self-cleaning effect with water CA as high as 162° and SA lower than 5°.
Lin Feng - One of the best experts on this subject based on the ideXlab platform.
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petal effect a superhydrophobic state with high Adhesive Force
Langmuir, 2008Co-Authors: Lin Feng, Yanan Zhang, Jinming Xi, Nu Wang, Lei JiangAbstract:Hierarchical micropapillae and nanofolds are known to exist on the petals' surfaces of red roses. These micro- and nanostructures provide a sufficient roughness for superhydrophobicity and yet at the same time a high Adhesive Force with water. A water droplet on the surface of the petal appears spherical in shape, which cannot roll off even when the petal is turned upside down. We define this phenomenon as the “petal effect” as compared with the popular “lotus effect”. Artificial fabrication of biomimic polymer films, with well-defined nanoembossed structures obtained by duplicating the petal's surface, indicates that the superhydrophobic surface and the Adhesive petal are in Cassie impregnating wetting state.
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super hydrophobic pdms surface with ultra low Adhesive Force
Macromolecular Rapid Communications, 2005Co-Authors: Xinjian Feng, Jinming Xi, Lin Feng, Jin Zhai, Lei JiangAbstract:Summary: Rough polydimethylsiloxane (PDMS) surface containing micro-, submicro- and nano-composite structures was fabricated using a facile one-step laser etching method. Such surface shows a super-hydrophobic character with contact angle higher than 160° and sliding angle lower than 5°, i.e. self-cleaning effect like lotus leaf. The wettabilities of the rough PDMS surfaces can be tunable by simply controlling the size of etched microstructures. The Adhesive Force between etched PDMS surface and water droplet is evaluated, and the structure effect is deduced by comparing it with those own a single nano- or micro-scale structures. This super-hydrophobic PDMS surface can be widely applied to many areas such as liquid transportation without loss, and micro-pump (creating pushing-Force) needless micro-fluidic devices. Etched PDMS surface containing micro-, submicro-, and nano-composite structures shows a self-cleaning effect with water CA as high as 162° and SA lower than 5°.
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Super‐Hydrophobic PDMS Surface with Ultra‐Low Adhesive Force
Macromolecular Rapid Communications, 2005Co-Authors: Xinjian Feng, Jinming Xi, Lin Feng, Jin Zhai, Lei JiangAbstract:Summary: Rough polydimethylsiloxane (PDMS) surface containing micro-, submicro- and nano-composite structures was fabricated using a facile one-step laser etching method. Such surface shows a super-hydrophobic character with contact angle higher than 160° and sliding angle lower than 5°, i.e. self-cleaning effect like lotus leaf. The wettabilities of the rough PDMS surfaces can be tunable by simply controlling the size of etched microstructures. The Adhesive Force between etched PDMS surface and water droplet is evaluated, and the structure effect is deduced by comparing it with those own a single nano- or micro-scale structures. This super-hydrophobic PDMS surface can be widely applied to many areas such as liquid transportation without loss, and micro-pump (creating pushing-Force) needless micro-fluidic devices. Etched PDMS surface containing micro-, submicro-, and nano-composite structures shows a self-cleaning effect with water CA as high as 162° and SA lower than 5°.
Hoon Eui Jeong - One of the best experts on this subject based on the ideXlab platform.
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Stretched Polymer Nanohairs by Tailored Capillarity and Adhesive Force
MRS Proceedings, 2020Co-Authors: Hoon Eui JeongAbstract:We present a simple method for fabricating high aspect-ratio polymer nanostructures on a solid substrate by sequential application of molding and drawing of a thin polymer film. In this method, a thin polymer film is prepared by spin coating on a solid substrate and the temperature is raised above the polymeri¯s glass transition while in conformal contact with a poly(urethane acrylate) (PUA) mold having nano-cavities. Consequently, capillary Forces induces deformation of the polymer melt into the void spaces of the mold and the filled nanostructure was further elongated upon removal of the mold due to tailored Adhesive Force at the mold/polymer interface. The optimum value of the work of adhesion at the mold/polymer interface ranged from 0.9 to 1.1 times that at the substrate/polymer interface. Below or above this range, a simple molding or detachment occurred, corresponding to earlier findings.
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High aspect-ratio polymer nanostructures by tailored capillarity and Adhesive Force
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2020Co-Authors: Hoon Eui JeongAbstract:We present simple methods for fabricating high aspect-ratio polymer nanostructures on a solid substrate by rigiflex lithography with tailored capillarity and Adhesive Force. In the first method, a thin, thermoplastic polymer film was prepared by spin coating on a substrate and the temperature was raised above the polymer's glass transition temperature (T-g) while in conformal contact with a poly(urethane acrylate) (PUA) mold having nanocavities. Consequently, capillarity Forces the polymer film to rise into the void space of the mold, resulting in nanostructures with an aspect ratio of similar to 4. In the second method, very high aspect-ratio (>20) nanohairs were fabricated by elongating the pre-formed nanostructures upon removal of the mold with the aid of tailored capillarity and Adhesive Force at the mold/polymer interface. Finally, these two methods were further used to fabricate micro/nano hierarchical structures by sequential application of the molding process for mimicking nature's functional surfaces such as a lotus leaf and gecko foot hairs. (C) 2007 Elsevier B.V. All rights reservedclose252
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high aspect ratio polymer nanostructures by tailored capillarity and Adhesive Force
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008Co-Authors: Hoon Eui JeongAbstract:We present simple methods for fabricating high aspect-ratio polymer nanostructures on a solid substrate by rigiflex lithography with tailored capillarity and Adhesive Force. In the first method, a thin, thermoplastic polymer film was prepared by spin coating on a substrate and the temperature was raised above the polymer's glass transition temperature (Tg) while in conformal contact with a poly(urethane acrylate) (PUA) mold having nanocavities. Consequently, capillarity Forces the polymer film to rise into the void space of the mold, resulting in nanostructures with an aspect ratio of ∼4. In the second method, very high aspect-ratio (>20) nanohairs were fabricated by elongating the pre-formed nanostructures upon removal of the mold with the aid of tailored capillarity and Adhesive Force at the mold/polymer interface. Finally, these two methods were further used to fabricate micro/nano hierarchical structures by sequential application of the molding process for mimicking nature's functional surfaces such as a lotus leaf and gecko foot hairs.
Jinming Xi - One of the best experts on this subject based on the ideXlab platform.
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petal effect a superhydrophobic state with high Adhesive Force
Langmuir, 2008Co-Authors: Lin Feng, Yanan Zhang, Jinming Xi, Nu Wang, Lei JiangAbstract:Hierarchical micropapillae and nanofolds are known to exist on the petals' surfaces of red roses. These micro- and nanostructures provide a sufficient roughness for superhydrophobicity and yet at the same time a high Adhesive Force with water. A water droplet on the surface of the petal appears spherical in shape, which cannot roll off even when the petal is turned upside down. We define this phenomenon as the “petal effect” as compared with the popular “lotus effect”. Artificial fabrication of biomimic polymer films, with well-defined nanoembossed structures obtained by duplicating the petal's surface, indicates that the superhydrophobic surface and the Adhesive petal are in Cassie impregnating wetting state.
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super hydrophobic pdms surface with ultra low Adhesive Force
Macromolecular Rapid Communications, 2005Co-Authors: Xinjian Feng, Jinming Xi, Lin Feng, Jin Zhai, Lei JiangAbstract:Summary: Rough polydimethylsiloxane (PDMS) surface containing micro-, submicro- and nano-composite structures was fabricated using a facile one-step laser etching method. Such surface shows a super-hydrophobic character with contact angle higher than 160° and sliding angle lower than 5°, i.e. self-cleaning effect like lotus leaf. The wettabilities of the rough PDMS surfaces can be tunable by simply controlling the size of etched microstructures. The Adhesive Force between etched PDMS surface and water droplet is evaluated, and the structure effect is deduced by comparing it with those own a single nano- or micro-scale structures. This super-hydrophobic PDMS surface can be widely applied to many areas such as liquid transportation without loss, and micro-pump (creating pushing-Force) needless micro-fluidic devices. Etched PDMS surface containing micro-, submicro-, and nano-composite structures shows a self-cleaning effect with water CA as high as 162° and SA lower than 5°.
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Super‐Hydrophobic PDMS Surface with Ultra‐Low Adhesive Force
Macromolecular Rapid Communications, 2005Co-Authors: Xinjian Feng, Jinming Xi, Lin Feng, Jin Zhai, Lei JiangAbstract:Summary: Rough polydimethylsiloxane (PDMS) surface containing micro-, submicro- and nano-composite structures was fabricated using a facile one-step laser etching method. Such surface shows a super-hydrophobic character with contact angle higher than 160° and sliding angle lower than 5°, i.e. self-cleaning effect like lotus leaf. The wettabilities of the rough PDMS surfaces can be tunable by simply controlling the size of etched microstructures. The Adhesive Force between etched PDMS surface and water droplet is evaluated, and the structure effect is deduced by comparing it with those own a single nano- or micro-scale structures. This super-hydrophobic PDMS surface can be widely applied to many areas such as liquid transportation without loss, and micro-pump (creating pushing-Force) needless micro-fluidic devices. Etched PDMS surface containing micro-, submicro-, and nano-composite structures shows a self-cleaning effect with water CA as high as 162° and SA lower than 5°.
