Philseok Kim - Academia.edu (original) (raw)

Papers by Philseok Kim

Research paper thumbnail of Large Area Multi-material Plasmonic Nanostructures Fabricated by Replica Molding and Mechanical Sectioning

Conference on Lasers and Electro-Optics 2010, 2010

... Mikhail A. Kats1*, Darren J. Lipomi2, Philseok Kim1, Sung H. Kang1, Joanna Aizenberg1, George... more ... Mikhail A. Kats1*, Darren J. Lipomi2, Philseok Kim1, Sung H. Kang1, Joanna Aizenberg1, George M. Whitesides2, Federico Capasso1 1School of ... We acknowledge Christian Pflugl, RomainBlanchard, and Benjamin Wiley for helpful discussions, as well as support from the ...

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Research paper thumbnail of Dynamic daylight control system implementing thin cast arrays of polydimethylsiloxane-based millimeter-scale transparent louvers

Building and Environment, 2014

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Research paper thumbnail of Hydrogel-actuated integrated responsive systems (HAIRS): Moving towards adaptive materials

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Research paper thumbnail of Fabrics coated with lubricated nanostructures display robust omniphobicity

Nanotechnology, Jan 10, 2014

The development of a stain-resistant and pressure-stable textile is desirable for consumer and in... more The development of a stain-resistant and pressure-stable textile is desirable for consumer and industrial applications alike, yet it remains a challenge that current technologies have been unable to fully address. Traditional superhydrophobic surfaces, inspired by the lotus plant, are characterized by two main components: hydrophobic chemical functionalization and surface roughness. While this approach produces water-resistant surfaces, these materials have critical weaknesses that hinder their practical utility, in particular as robust stain-free fabrics. For example, traditional superhydrophobic surfaces fail (i.e., become stained) when exposed to low-surface-tension liquids, under pressure when impacted by a high-velocity stream of water (e.g., rain), and when exposed to physical forces such as abrasion and twisting. We have recently introduced slippery lubricant-infused porous surfaces (SLIPS), a self-healing, pressure-tolerant and omniphobic surface, to address these issues. He...

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Research paper thumbnail of Rational Design of Mechano-Responsive Optical Materials by Fine Tuning the Evolution of Strain-Dependent Wrinkling Patterns

Advanced Optical Materials, 2013

ABSTRACT Rational design strategies for mechano-responsive optical material systems are created b... more ABSTRACT Rational design strategies for mechano-responsive optical material systems are created by introducing a simple experimental system that can continuously vary the state of bi-axial stress to induce various wrinkling patterns, including stripes, labyrinths, herringbones, and rarely observed checkerboards, that can dynamically tune the optical properties. In particular, a switching of two orthogonally oriented stripe wrinkle patterns from oxidized polydimethylsiloxane around the critical strain value is reported, as well as the coexistence of these wrinkles forming elusive checkerboard patterns, which are predicted only in previous simulations. These strain-induced wrinkle patterns give rise to dynamic changes in optical transmittance and diffraction patterns. A theoretical description of the observed pattern formation is presented which accounts for the residual stress in the membrane and allows for the fine-tuning of the window of switching of the orthogonal wrinkles. Applications of wrinkle-induced changes in optical properties are demonstrated, including a mechanically responsive instantaneous privacy screen and a transparent sheet that reversibly reveals a message or graphic and dynamically switches the transmittance when stretched and released.

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Research paper thumbnail of Bioinspired micrograting arrays mimicking the reverse color diffraction elements evolved by the butterfly Pierella luna

Proceedings of the National Academy of Sciences of the United States of America, Jan 4, 2014

Recently, diffraction elements that reverse the color sequence normally observed in planar diffra... more Recently, diffraction elements that reverse the color sequence normally observed in planar diffraction gratings have been found in the wing scales of the butterfly Pierella luna. Here, we describe the creation of an artificial photonic material mimicking this reverse color-order diffraction effect. The bioinspired system consists of ordered arrays of vertically oriented microdiffraction gratings. We present a detailed analysis and modeling of the coupling of diffraction resulting from individual structural components and demonstrate its strong dependence on the orientation of the individual miniature gratings. This photonic material could provide a basis for novel developments in biosensing, anticounterfeiting, and efficient light management in photovoltaic systems and light-emitting diodes.

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Research paper thumbnail of A Resource Management Scheme in the Endpoint Mixing Conference System in a Ubiquitous Environment

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Research paper thumbnail of Current Status and Perspectives for Management of PBTs

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Research paper thumbnail of CHED 732-Development of thick film P3HT: PCBM bulk heterojunction devices and their hole mobilities characterized by time-of-flight measurements

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Research paper thumbnail of Polymer/BaTiO3 nanocomposites for energy storage

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Research paper thumbnail of Actuation and self-assembly of hybrid nanostructured surfaces

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Research paper thumbnail of Biomimetic, hierarchical, multidimensional patterning of conductive polymers on high-aspect-ratio microstructures

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Research paper thumbnail of Adaptive shading, display and color control

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Research paper thumbnail of Bio-inspired slippery anti-frost coating on aluminum for energy efficient refrigerator heat exchangers

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Research paper thumbnail of Patterned pH-responsive hydrogel-driven actuation via microfluidic chemical gradients

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Research paper thumbnail of Adaptive Materials: Rational Design of Mechano‐Responsive Optical Materials by Fine Tuning the Evolution of Strain‐Dependent Wrinkling Patterns (Advanced Optical Materials 5/2013)

ABSTRACT Rational design strategies for mechano-responsive optical material systems are created b... more ABSTRACT Rational design strategies for mechano-responsive optical material systems are created by introducing a simple experimental system that can continuously vary the state of bi-axial stress to induce various wrinkling patterns, including stripes, labyrinths, herringbones, and rarely observed checkerboards, that can dynamically tune the optical properties. In particular, a switching of two orthogonally oriented stripe wrinkle patterns from oxidized polydimethylsiloxane around the critical strain value is reported, as well as the coexistence of these wrinkles forming elusive checkerboard patterns, which are predicted only in previous simulations. These strain-induced wrinkle patterns give rise to dynamic changes in optical transmittance and diffraction patterns. A theoretical description of the observed pattern formation is presented which accounts for the residual stress in the membrane and allows for the fine-tuning of the window of switching of the orthogonal wrinkles. Applications of wrinkle-induced changes in optical properties are demonstrated, including a mechanically responsive instantaneous privacy screen and a transparent sheet that reversibly reveals a message or graphic and dynamically switches the transmittance when stretched and released.

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Research paper thumbnail of Surface modification of barium titanate nanoparticles for dielectric nanocomposites

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Research paper thumbnail of Multiphoton writing of 3D pH and temperature-responsive hydrogels integrated with high-aspect-ratio polymer microbristles

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Research paper thumbnail of A non-thrombogenic, anti-biofilm surface for medical devices

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Research paper thumbnail of Solution-processible high-permittivity nanocomposite gate insulators for organic field-effect transistors

We report on solution-processible high permittivity nanocomposite gate insulators based on BaTiO3... more We report on solution-processible high permittivity nanocomposite gate insulators based on BaTiO3 nanoparticles, surface-modified with a phosphonic acid, in poly(4-vinylphenol) for organic field-effect transistors. The use of surface-modified BaTiO3 nanoparticles affords high quality nanocomposite thin films at large nanoparticle volume fractions (up to 37 vol %) with a large capacitance density and a low leakage current (10-8 A/cm2). The fabricated pentacene field-effect transistors using these nanocomposites show a large on/off current ratio (Ion/off 104-106) due to the high capacitance density and small leakage current of the gate insulator.

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Research paper thumbnail of Large Area Multi-material Plasmonic Nanostructures Fabricated by Replica Molding and Mechanical Sectioning

Conference on Lasers and Electro-Optics 2010, 2010

... Mikhail A. Kats1*, Darren J. Lipomi2, Philseok Kim1, Sung H. Kang1, Joanna Aizenberg1, George... more ... Mikhail A. Kats1*, Darren J. Lipomi2, Philseok Kim1, Sung H. Kang1, Joanna Aizenberg1, George M. Whitesides2, Federico Capasso1 1School of ... We acknowledge Christian Pflugl, RomainBlanchard, and Benjamin Wiley for helpful discussions, as well as support from the ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dynamic daylight control system implementing thin cast arrays of polydimethylsiloxane-based millimeter-scale transparent louvers

Building and Environment, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Hydrogel-actuated integrated responsive systems (HAIRS): Moving towards adaptive materials

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fabrics coated with lubricated nanostructures display robust omniphobicity

Nanotechnology, Jan 10, 2014

The development of a stain-resistant and pressure-stable textile is desirable for consumer and in... more The development of a stain-resistant and pressure-stable textile is desirable for consumer and industrial applications alike, yet it remains a challenge that current technologies have been unable to fully address. Traditional superhydrophobic surfaces, inspired by the lotus plant, are characterized by two main components: hydrophobic chemical functionalization and surface roughness. While this approach produces water-resistant surfaces, these materials have critical weaknesses that hinder their practical utility, in particular as robust stain-free fabrics. For example, traditional superhydrophobic surfaces fail (i.e., become stained) when exposed to low-surface-tension liquids, under pressure when impacted by a high-velocity stream of water (e.g., rain), and when exposed to physical forces such as abrasion and twisting. We have recently introduced slippery lubricant-infused porous surfaces (SLIPS), a self-healing, pressure-tolerant and omniphobic surface, to address these issues. He...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Rational Design of Mechano-Responsive Optical Materials by Fine Tuning the Evolution of Strain-Dependent Wrinkling Patterns

Advanced Optical Materials, 2013

ABSTRACT Rational design strategies for mechano-responsive optical material systems are created b... more ABSTRACT Rational design strategies for mechano-responsive optical material systems are created by introducing a simple experimental system that can continuously vary the state of bi-axial stress to induce various wrinkling patterns, including stripes, labyrinths, herringbones, and rarely observed checkerboards, that can dynamically tune the optical properties. In particular, a switching of two orthogonally oriented stripe wrinkle patterns from oxidized polydimethylsiloxane around the critical strain value is reported, as well as the coexistence of these wrinkles forming elusive checkerboard patterns, which are predicted only in previous simulations. These strain-induced wrinkle patterns give rise to dynamic changes in optical transmittance and diffraction patterns. A theoretical description of the observed pattern formation is presented which accounts for the residual stress in the membrane and allows for the fine-tuning of the window of switching of the orthogonal wrinkles. Applications of wrinkle-induced changes in optical properties are demonstrated, including a mechanically responsive instantaneous privacy screen and a transparent sheet that reversibly reveals a message or graphic and dynamically switches the transmittance when stretched and released.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Bioinspired micrograting arrays mimicking the reverse color diffraction elements evolved by the butterfly Pierella luna

Proceedings of the National Academy of Sciences of the United States of America, Jan 4, 2014

Recently, diffraction elements that reverse the color sequence normally observed in planar diffra... more Recently, diffraction elements that reverse the color sequence normally observed in planar diffraction gratings have been found in the wing scales of the butterfly Pierella luna. Here, we describe the creation of an artificial photonic material mimicking this reverse color-order diffraction effect. The bioinspired system consists of ordered arrays of vertically oriented microdiffraction gratings. We present a detailed analysis and modeling of the coupling of diffraction resulting from individual structural components and demonstrate its strong dependence on the orientation of the individual miniature gratings. This photonic material could provide a basis for novel developments in biosensing, anticounterfeiting, and efficient light management in photovoltaic systems and light-emitting diodes.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A Resource Management Scheme in the Endpoint Mixing Conference System in a Ubiquitous Environment

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Current Status and Perspectives for Management of PBTs

Bookmarks Related papers MentionsView impact

Research paper thumbnail of CHED 732-Development of thick film P3HT: PCBM bulk heterojunction devices and their hole mobilities characterized by time-of-flight measurements

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Polymer/BaTiO3 nanocomposites for energy storage

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Actuation and self-assembly of hybrid nanostructured surfaces

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Biomimetic, hierarchical, multidimensional patterning of conductive polymers on high-aspect-ratio microstructures

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Adaptive shading, display and color control

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Bio-inspired slippery anti-frost coating on aluminum for energy efficient refrigerator heat exchangers

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Patterned pH-responsive hydrogel-driven actuation via microfluidic chemical gradients

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Adaptive Materials: Rational Design of Mechano‐Responsive Optical Materials by Fine Tuning the Evolution of Strain‐Dependent Wrinkling Patterns (Advanced Optical Materials 5/2013)

ABSTRACT Rational design strategies for mechano-responsive optical material systems are created b... more ABSTRACT Rational design strategies for mechano-responsive optical material systems are created by introducing a simple experimental system that can continuously vary the state of bi-axial stress to induce various wrinkling patterns, including stripes, labyrinths, herringbones, and rarely observed checkerboards, that can dynamically tune the optical properties. In particular, a switching of two orthogonally oriented stripe wrinkle patterns from oxidized polydimethylsiloxane around the critical strain value is reported, as well as the coexistence of these wrinkles forming elusive checkerboard patterns, which are predicted only in previous simulations. These strain-induced wrinkle patterns give rise to dynamic changes in optical transmittance and diffraction patterns. A theoretical description of the observed pattern formation is presented which accounts for the residual stress in the membrane and allows for the fine-tuning of the window of switching of the orthogonal wrinkles. Applications of wrinkle-induced changes in optical properties are demonstrated, including a mechanically responsive instantaneous privacy screen and a transparent sheet that reversibly reveals a message or graphic and dynamically switches the transmittance when stretched and released.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Surface modification of barium titanate nanoparticles for dielectric nanocomposites

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Multiphoton writing of 3D pH and temperature-responsive hydrogels integrated with high-aspect-ratio polymer microbristles

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A non-thrombogenic, anti-biofilm surface for medical devices

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solution-processible high-permittivity nanocomposite gate insulators for organic field-effect transistors

We report on solution-processible high permittivity nanocomposite gate insulators based on BaTiO3... more We report on solution-processible high permittivity nanocomposite gate insulators based on BaTiO3 nanoparticles, surface-modified with a phosphonic acid, in poly(4-vinylphenol) for organic field-effect transistors. The use of surface-modified BaTiO3 nanoparticles affords high quality nanocomposite thin films at large nanoparticle volume fractions (up to 37 vol %) with a large capacitance density and a low leakage current (10-8 A/cm2). The fabricated pentacene field-effect transistors using these nanocomposites show a large on/off current ratio (Ion/off 104-106) due to the high capacitance density and small leakage current of the gate insulator.

Bookmarks Related papers MentionsView impact