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RISS 인기검색어
- 검색키워드
- 저자 : Y . Y . Earmme ) (검색결과 44 건)
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Effect of end-block chain length on rheological properties of ABA triblock copolymer hydrogels
Hyunjoon Jung,Taeshik Earmme,Soo-Hyung Choi 한국유변학회 2021 Korea-Australia rheology journal Vol.33 No.2
End-block length dependence of the hydrogel relaxation dynamics was investigated using PEO-based ABA triblock copolymer solutions in an aqueous solvent. Both ends of PEO were capped with hydrophobic poly(isopropyl glycidyl ether-co-ethyl glycidyl ether) exhibiting a lower critical solution temperature (LCST) behavior, resulting in the transition between sol and gel with temperature. Despite the nearly identical hydrophobicity of the end-blocks, the sol-to-gel transition temperature is found to be significantly dependent on the end-block length. Particularly, a small increment of the end-block length leads to significantly slower relaxation dynamics which is attributed to the thermodynamic barrier of end-block extraction. Hydrogels with an appropriate relaxation time show excellent injectability and self-healing ability, yet extremely slow relaxation dynamics result in brittle hydrogels. These results are discussed in terms of current understanding of the hydrogel relaxation dynamics and particular attention is paid to the issue of the chain dynamics between aggregated cores.
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Polyurethane triblock copolymer gate dielectrics for low-voltage organic thin-film transistors
Kim, Dongkyu,Kim, Choongik,Earmme, Taeshik Elsevier 2019 Journal of industrial and engineering chemistry Vol.71 No.-
<P><B>Abstract</B></P> <P>Novel polyurethane triblock copolymers comprising polycaprolactone diol (PCL), 1,6-hexamethylene diisocyanate (HMDI), and polyethylene glycol (PEG) were synthesized for use as gate dielectric for organic thin-film transistors (OTFTs). Thin films of polyurethane gate dielectrics processed from solution exhibit excellent insulating properties (∼7×10<SUP>−7</SUP> A/cm<SUP>2</SUP> at 1V) as well as large areal capacitance (170nF/cm<SUP>2</SUP>) with film thickness of ∼50nm. OTFTs are fabricated with representative n-channel organic semiconductor (N,N′-ditridecylperylene-3,4,9,10-tetracarboxylic diimide; PTCDI-C13) using the developed gate dielectrics, and the resulting devices show decent electrical performance with negligible hysteresis at low operating voltage of 1V.</P>
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Jeong Hun Seo,Taemin Earmme,Gang-Won Jang,Yoon Young Kim 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.1
The multiscale wavelet-Galerkin method implemented in an adaptive manner has an advantage of obtaining accurate solutions with a substantially reduced number of interpolation points. The method is becoming popular, but its numerical efficiency still needs improvement. The objectives of this investigation are to present a new numerical scheme to improve the performance of the multi scale adaptive wavelet-Galerkin method and to give detailed implementation procedure. Specifically, the subdomain technique suitable for multiscale methods is developed and implemented. When the standard wavelet-Galerkin method is implemented without domain subdivision, the interaction between very long scale wavelets and very short scale wavelets leads to a poorly-sparse system matrix, which considerably worsens numerical efficiency for large- sized problems. The performance of the developed strategy is checked in terms of numerical costs such as the CPU time and memory size. Since the detailed implementation procedure including preprocessing and stiffness matrix construction is given, researchers having experiences in standard finite element implementation may be able to extend the multiscale method further or utilize some features of the multiscale method in their own applications.
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Seo Jeong Hun,Earmme Taemin,Jang Gang-Won,Kim Yoon Young The Korean Society of Mechanical Engineers 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.1
The multi scale wavelet-Galerkin method implemented in an adaptive manner has an advantage of obtaining accurate solutions with a substantially reduced number of interpolation points. The method is becoming popular, but its numerical efficiency still needs improvement. The objectives of this investigation are to present a new numerical scheme to improve the performance of the multi scale adaptive wavelet-Galerkin method and to give detailed implementation procedure. Specifically, the subdomain technique suitable for multiscale methods is developed and implemented. When the standard wavelet-Galerkin method is implemented without domain subdivision, the interaction between very long scale wavelets and very short scale wavelets leads to a poorly-sparse system matrix, which considerably worsens numerical efficiency for large-sized problems. The performance of the developed strategy is checked in terms of numerical costs such as the CPU time and memory size. Since the detailed implementation procedure including preprocessing and stiffness matrix construction is given, researchers having experiences in standard finite element implementation may be able to extend the multi scale method further or utilize some features of the multiscale method in their own applications.
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Polyurethane triblock copolymer gate dielectrics for low-voltage organic thin-film transistors
김동규,김충익,Taeshik Earmme 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
Novel polyurethane triblock copolymers comprising polycaprolactone diol (PCL), 1,6-hexamethylene diisocyanate (HMDI), and polyethylene glycol (PEG) were synthesized for use as gate dielectric for organic thin-film transistors (OTFTs). Thin films of polyurethane gate dielectrics processed from solution exhibit excellent insulating properties (∼7 × 10−7 A/cm2 at 1 V) as well as large areal capacitance (170 nF/cm2) with film thickness of ∼50 nm. OTFTs are fabricated with representative n-channel organic semiconductor (N,N′-ditridecylperylene-3,4,9,10-tetracarboxylic diimide; PTCDI-C13) using the developed gate dielectrics, and the resulting devices show decent electrical performance with negligible hysteresis at low operating voltage of 1 V.
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Enhancing gas–liquid volumetric mass transfer coefficient
Dongil Ho,Kwangmin Kim,Taeshik Earmme,Choongik Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
Methane-based biorefineries for biofuel production by microorganisms has gained interest due to theworldwide development of shale gas as an alternative source for fossil fuels. For the practical applicationof biological conversion process to industrial scale, enhancement of the gas–liquid volumetric masstransfer coefficient (kLa) in a gas diffusing system is crucial. This review article provides an overview ofthe developments on gas–liquid volumetric mass transfer enhancement through increasing the gas–liquid mass transfer coefficient term ‘kL’ and/or increasing the gas–liquid interfacial area term ‘a’. Twomajor enhancement methods which are summarized and discussed here include the most recentaccomplishments in gas–liquid mass transfer engineering of gas diffusing systems. The most up-to-datemechanical modification of reactor and additive employment rationales and discussions providing astrong understanding of gas–liquid volumetric mass transfer relationships are presented. Thus, thisreview is expected to inspire new research for future developments and applications in gas–liquid masstransfer engineering for gas diffusing systems.
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