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23 results on '"Cheng, Yi Kai"'

5. Synergic effect of graphene oxide and boron nitride on the mechanical properties of polyimide composite films

Author

Cheng, Yi Kai, Campéon, Benoît Denis Louis, Obata, Seiji, Nishina, Yuta, Cheng, Yi Kai, Campéon, Benoît Denis Louis, Obata, Seiji, and Nishina, Yuta

Abstract

The addition of two-dimensional (2D) materials into polymers can improve their mechanical properties. In particular, graphene oxide (GO) and hexagonal boron nitride (h-BN) are expected to be potential nanoplatelet additives for polymers. Interactions between such nanoplatelets and polymers are effective in improving the above properties. However, no report has investigated the effect of using two types of nanoplatelets that have good interaction with polymers. In this study, we fabricated polyimide (PI) films that contain two types of nanoplatelets, amine-functionalized h-BN (BNNH2) and GO. We have elucidated that the critical ratio and the content of BNNH2 and GO within PI govern the films' mechanical properties. When the BNNH2/GO weight ratio was 52 : 1 and their content was 1 wt% in the PI film, the tensile modulus and tensile strength were increased by 155.2 MPa and 4.2 GPa compared with the pristine PI film.

Published
2022

8. Electrospun Fibers as a Solid-State Real-Time Zinc Ion Sensor with High Sensitivity and Cell Medium Compatibility

Author

Syu, Jia-Hao, primary, Cheng, Yi-Kai, additional, Hong, Wun-Yan, additional, Wang, Hsing-Ping, additional, Lin, Yu-Chao, additional, Meng, Hsin-Fei, additional, Zan, Hsiao-Wen, additional, Horng, Sheng-Fu, additional, Chang, Gao-Fong, additional, Hung, Chen-Hsiung, additional, Chiu, Yu-Cheng, additional, Chen, Wen-Chang, additional, Tsai, May-Jywan, additional, and Cheng, Henrich, additional

Published
2012
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17. P-214: Wedge-Plate Type Circular Display

Author

Cheng, Yi-Kai, primary, Wu, Zhong-Ying, additional, Chang, Ran-Hung, additional, Chern, Jyh-Long, additional, Chou, Ming-Der, additional, Wu, Shih-Min, additional, and Mo, Chi-Neng, additional

Published
2006
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19. Far-Infrared Resonance in Split Ring Resonators

Author

Hsu, A-Chuan, primary, Cheng, Yi-Kai, additional, Chen, Kuan-Hung, additional, Chern, Jyh-Long, additional, Wu, Shich-Chuan, additional, Chen, Ching-Fu, additional, Chang, Hao, additional, Lien, Yu-Hung, additional, and Shy, Jow-Tsong, additional

Published
2004
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21. Electrospun Fibers as a Solid-State Real-Time Zinc Ion Sensor with High Sensitivity and Cell Medium Compatibility.

Author

Syu, Jia‐Hao, Cheng, Yi‐Kai, Hong, Wun‐Yan, Wang, Hsing‐Ping, Lin, Yu‐Chao, Meng, Hsin‐Fei, Zan, Hsiao‐Wen, Horng, Sheng‐Fu, Chang, Gao‐Fong, Hung, Chen‐Hsiung, Chiu, Yu‐Cheng, Chen, Wen‐Chang, Tsai, May‐Jywan, and Cheng, Henrich

Abstract

meso-2,6-Dichlorophenyltripyrrinone (TPN-Cl2), a probe molecule for zinc II ions, is dispersed in a polymer host. The red fluorescence peak at 620 nm appears when the molecule forms a complex with zinc at its center. TPN-Cl2 has a high selectivity for zinc II and tolerates many common metal ions present in the human body. The probe molecules are blended with a hydrogel polymer, poly(2-hydroxyethyl methacrylate) (poly HEMA), with 30 wt% dimethylformamide (DMF). The fiber structure with 1 μm diameter is made by electrospinning in DMF solution of the probe and poly HEMA mixture. The fibrous film detects zinc ions with concentrations as low as 10−6 M in real-time both in water and in the commonly used cell culture liquid media Dulbecco's modified Eagle medium (DMEM) and fetal bovine serum (FBS), which contain many metal ions and proteins. The time-resolution is 5 min for 10−6 M and 1 min for 10−5 M. This sensitivity and response speed satisfy the requirements for non-invasive biomedical studies. [ABSTRACT FROM AUTHOR]

Published
2013
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22. Integrated semiconductor optoelectronic devices for real-time and indicator-free detection of aqueous nitric oxide

Author

Wang, Shin-Ping, Cheng, Yi-Kai, Chao, Yu-Chiang, Zan, Hsiao-Wen, Chang, Gao-Fong, Meng, Hsin-Fei, Hung, Chen-Hsiung, and Chen, Wen-Chang

Abstract

Sensing films specific to nitric oxide and zinc were fabricated by embedding respectively indicator 1,2-diaminoanthraquinone (DAQ) and 11,16-Bis(phenyl)-6,6,21,21-tetramethyl-m-benzi-6,21-porphodimethene (BPDM-H) in hydrogel host poly(2-hydroxyethyl methacrylate). The sensing film contains DAQ, which responses to nitric oxide, shows stability in acid environment. The sensing film contains BPDM-H responses to zinc. The electrospinning technique was also utilized to fabricate the fibrous film.

Published
2011
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23. Polarization-preserving angular shifter.

Author

Cheng YK and Chern JL

Subjects
Algorithms, Equipment Design, Image Interpretation, Computer-Assisted, Microscopy, Polarization methods, Models, Statistical, Models, Theoretical, Phantoms, Imaging, Refraction, Ocular, Refractometry, Scattering, Radiation, Light, Microscopy, Polarization instrumentation, Optics and Photonics
Abstract

This study shows that by using a wedge plate the incident direction of light propagation can be rotated as desired while still preserving beam polarization. This study also deduces the basic condition of this preservation of polarization. Two typical wedge plates are analyzed for numerical demonstration. Simulation results verify that a collimated beam with a +45 degrees linear polarization can be guided to an expected direction while preserving the state of polarization with a square of the variation of the ellipse ratio of less than 0.0001%. This study also numerically shows that the wedge vertex angle is the most critical issue and that approximately 0.1 degrees accuracy is required to preserve the polarization state.

Published
2008
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