The Experts below are selected from a list of 10773 Experts worldwide ranked by ideXlab platform
Wen-chang Chen - One of the best experts on this subject based on the ideXlab platform.
-
transparent organic inorganic hybrid thin Films prepared from acrylic polymer and aqueous monodispersed colloidal silica
Materials Chemistry and Physics, 2003Co-Authors: Yangyen Yu, Wen-chang ChenAbstract:Highly transparent hybrid Films containing nano-sized silica domain were synthesized from acrylic polymer and aqueous monodispersed colloidal silica (CS) with a coupling agent, 3-(trimethoxysilyl)propyl methacrylate (MSMA). The silica content in the hybrid thin Films was varied from 0 to 50 wt.%. The experimental results showed that the silica particle size in the precursor solution and the hybrid Films was varied from 20 to 40 nm. It could be controlled by the mole ratio of MSMA to silica. The results of scanning electron microscope (SEM), transmission electron microscope (TEM), and elemental analysis support the above conclusion. The prepared hybrid Films showed high Film Uniformity and optical transparence. The thermal stability of the prepared hybrid Films increased with the increasing silica content. The refractive index decreased linearly with the increasing silica fraction in the hybrid Films. The experimental results suggest that the hybrid thin Films have potential applications as passive Films for optical devices.
-
synthesis and characterization of organic inorganic hybrid thin Films from poly acrylic and monodispersed colloidal silica
Polymer, 2003Co-Authors: Ching Yi Chen, Wen-chang ChenAbstract:Abstract Hybrid thin Films containing nano-sized inorganic domain were synthesized from poly(acrylic) and monodispersed colloidal silica with coupling agent. The 3-(trimethoxysilyl)propyl methacrylate (MSMA) was bonded with colloidal silica first, and then polymerized with acrylic monomer to form a precursor solution. Then, the precursor was spin coated and cured to form the hybrid Films. The silica content in the hybrid thin Films was varied from 0 to 50 wt%. The experimental results showed that the coverage area of silica particle by the MSMA decreased with increasing silica content and resulted in the aggregation of silica particle in the hybrid Films. Thus, the silica domain in the hybrid Films was varied from 20 to 35 nm by the different mole ratios of MSMA to silica. The results of scanning electron microscope, transmission electron microscope, and elemental analysis support the above results. The prepared hybrid Films from the crosslinked acrylic polymer moiety showed much better Film Uniformity, thermal stability and mechanical properties than the poly(methyl methacrylate) (PMMA) based hybrid materials. Large pin-holes were found in the PMMA–silica hybrid Films probably due to the significant difference on thermal properties between the two moieties or the evaporation of solvent. The refractive index decreased linearly with increasing the silica fraction in the hybrid Films. Excellent optical transparence was obtained in the prepared hybrid Films. These results show that the hybrid thin Films have potential applications as passive Films for optical devices.
Hasan Tawfique - One of the best experts on this subject based on the ideXlab platform.
-
Hexagonal Boron Nitride-Enhanced Optically Transparent Polymer Dielectric Inks for Printable Electronics.
'Organisation for Economic Co-Operation and Development (OECD)', 2020Co-Authors: Zhu Xiaoxi, Hu Guohua, Wu Tien-chun, Um Doo-seung, Macadam Nasiruddin, Hasan TawfiqueAbstract:Solution-processable thin-Film dielectrics represent an important material family for large-area, fully-printed electronics. Yet, in recent years, it has seen only limited development, and has mostly remained confined to pure polymers. Although it is possible to achieve excellent printability, these polymers have low (≈2-5) dielectric constants (ε r ). There have been recent attempts to use solution-processed 2D hexagonal boron nitride (h-BN) as an alternative. However, the deposited h-BN flakes create porous thin-Films, compromising their mechanical integrity, substrate adhesion, and susceptibility to moisture. These challenges are addressed by developing a "one-pot" formulation of polyurethane (PU)-based inks with h-BN nano-fillers. The approach enables coating of pinhole-free, flexible PU+h-BN dielectric thin-Films. The h-BN dispersion concentration is optimized with respect to exfoliation yield, optical transparency, and thin-Film Uniformity. A maximum ε r ≈ 7.57 is achieved, a two-fold increase over pure PU, with only 0.7 vol% h-BN in the dielectric thin-Film. A high optical transparency of ≈78.0% (≈0.65% variation) is measured across a 25 cm2 area for a 10 μm thick dielectric. The dielectric property of the composite is also consistent, with a measured areal capacitance variation of
-
Hexagonal Boron Nitride-Enhanced Optically Transparent Polymer Dielectric Inks for Printable Electronics.
'Organisation for Economic Co-Operation and Development (OECD)', 2020Co-Authors: Zhu Xiaoxi, Hu Guohua, Wu Tien-chun, Um Doo-seung, Macadam Nasiruddin, Hasan TawfiqueAbstract:Solution-processable thin-Film dielectrics represent an important material family for large-area fully-printed electronics. Yet, in recent years, it has seen only limited development, and has mostly remained confined to pure polymers. Although it is possible to achieve excellent printability, these polymers have low (∼2-5) dielectric constants (εr). There have been recent attempts to use solution-processed two-dimensional (2D) hexagonal boron nitride (h-BN) as an alternative. However, the deposited h-BN flakes create porous thin-Films, compromising their mechanical integrity, substrate adhesion and susceptibility to moisture. We address these challenges by developing a ‘one-pot’ formulation of polyurethane (PU)-based inks with h-BN nano-fillers. Our approach enables coating of pinhole-free, flexible PU+h-BN dielectric thin- Films. We optimise the h-BN dispersion concentration with respect to exfoliation yield, optical transparency and thin-Film Uniformity. We achieve a maximum εr∼7.57, a two-fold increase over pure PU, with only 0.7 vol% h-BN in the dielectric thin-Film. A high optical transparency of ∼78.0% (∼0.65% variation) is measured across a 25 cm2 area for a μm thick dielectric. The dielectric property of the composite is also consistent, with a measured areal capacitance variation of < 8% across 64 printed capacitors. Our formulation represents an optically transparent, flexible thin-Film, with enhanced dielectric constant for printed electronics.EPSRC funding acknowledged (EP/L016087/1
Hasan T - One of the best experts on this subject based on the ideXlab platform.
-
Hexagonal Boron Nitride–Enhanced Optically Transparent Polymer Dielectric Inks for Printable Electronics
2020Co-Authors: Zhu X, Ng Lwt, Hu G, Macadam N, Hasan TAbstract:© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Solution-processable thin-Film dielectrics represent an important material family for large-area, fully-printed electronics. Yet, in recent years, it has seen only limited development, and has mostly remained confined to pure polymers. Although it is possible to achieve excellent printability, these polymers have low (≈2–5) dielectric constants (εr). There have been recent attempts to use solution-processed 2D hexagonal boron nitride (h-BN) as an alternative. However, the deposited h-BN flakes create porous thin-Films, compromising their mechanical integrity, substrate adhesion, and susceptibility to moisture. These challenges are addressed by developing a “one-pot” formulation of polyurethane (PU)-based inks with h-BN nano-fillers. The approach enables coating of pinhole-free, flexible PU+h-BN dielectric thin-Films. The h-BN dispersion concentration is optimized with respect to exfoliation yield, optical transparency, and thin-Film Uniformity. A maximum εr ≈ 7.57 is achieved, a two-fold increase over pure PU, with only 0.7 vol% h-BN in the dielectric thin-Film. A high optical transparency of ≈78.0% (≈0.65% variation) is measured across a 25 cm2 area for a 10 μm thick dielectric. The dielectric property of the composite is also consistent, with a measured areal capacitance variation of
-
Hexagonal Boron Nitride–Enhanced Optically Transparent Polymer Dielectric Inks for Printable Electronics
2020Co-Authors: Zhu X, Ng Lwt, Hu G, Macadam N, Hasan TAbstract:Solution-processable thin-Film dielectrics represent an important material family for large-area, fully-printed electronics. Yet, in recent years, it has seen only limited development, and has mostly remained confined to pure polymers. Although it is possible to achieve excellent printability, these polymers have low (≈2–5) dielectric constants (εr). There have been recent attempts to use solution-processed 2D hexagonal boron nitride (h-BN) as an alternative. However, the deposited h-BN flakes create porous thin-Films, compromising their mechanical integrity, substrate adhesion, and susceptibility to moisture. These challenges are addressed by developing a “one-pot” formulation of polyurethane (PU)-based inks with h-BN nano-fillers. The approach enables coating of pinhole-free, flexible PU+h-BN dielectric thin-Films. The h-BN dispersion concentration is optimized with respect to exfoliation yield, optical transparency, and thin-Film Uniformity. A maximum εr ≈ 7.57 is achieved, a two-fold increase over pure PU, with only 0.7 vol% h-BN in the dielectric thin-Film. A high optical transparency of ≈78.0% (≈0.65% variation) is measured across a 25 cm2 area for a 10 μm thick dielectric. The dielectric property of the composite is also consistent, with a measured areal capacitance variation of
Yangyen Yu - One of the best experts on this subject based on the ideXlab platform.
-
transparent organic inorganic hybrid thin Films prepared from acrylic polymer and aqueous monodispersed colloidal silica
Materials Chemistry and Physics, 2003Co-Authors: Yangyen Yu, Wen-chang ChenAbstract:Highly transparent hybrid Films containing nano-sized silica domain were synthesized from acrylic polymer and aqueous monodispersed colloidal silica (CS) with a coupling agent, 3-(trimethoxysilyl)propyl methacrylate (MSMA). The silica content in the hybrid thin Films was varied from 0 to 50 wt.%. The experimental results showed that the silica particle size in the precursor solution and the hybrid Films was varied from 20 to 40 nm. It could be controlled by the mole ratio of MSMA to silica. The results of scanning electron microscope (SEM), transmission electron microscope (TEM), and elemental analysis support the above conclusion. The prepared hybrid Films showed high Film Uniformity and optical transparence. The thermal stability of the prepared hybrid Films increased with the increasing silica content. The refractive index decreased linearly with the increasing silica fraction in the hybrid Films. The experimental results suggest that the hybrid thin Films have potential applications as passive Films for optical devices.
Ching Yi Chen - One of the best experts on this subject based on the ideXlab platform.
-
synthesis and characterization of organic inorganic hybrid thin Films from poly acrylic and monodispersed colloidal silica
Polymer, 2003Co-Authors: Ching Yi Chen, Wen-chang ChenAbstract:Abstract Hybrid thin Films containing nano-sized inorganic domain were synthesized from poly(acrylic) and monodispersed colloidal silica with coupling agent. The 3-(trimethoxysilyl)propyl methacrylate (MSMA) was bonded with colloidal silica first, and then polymerized with acrylic monomer to form a precursor solution. Then, the precursor was spin coated and cured to form the hybrid Films. The silica content in the hybrid thin Films was varied from 0 to 50 wt%. The experimental results showed that the coverage area of silica particle by the MSMA decreased with increasing silica content and resulted in the aggregation of silica particle in the hybrid Films. Thus, the silica domain in the hybrid Films was varied from 20 to 35 nm by the different mole ratios of MSMA to silica. The results of scanning electron microscope, transmission electron microscope, and elemental analysis support the above results. The prepared hybrid Films from the crosslinked acrylic polymer moiety showed much better Film Uniformity, thermal stability and mechanical properties than the poly(methyl methacrylate) (PMMA) based hybrid materials. Large pin-holes were found in the PMMA–silica hybrid Films probably due to the significant difference on thermal properties between the two moieties or the evaporation of solvent. The refractive index decreased linearly with increasing the silica fraction in the hybrid Films. Excellent optical transparence was obtained in the prepared hybrid Films. These results show that the hybrid thin Films have potential applications as passive Films for optical devices.