Browsing by Author "Chen, Tsung-Wen"

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Analysis of Hydroxyl Radical and Hydrogen Peroxide Generated in Helium-Based Atmospheric-Pressure Plasma Jet and in Different Solutions Treated by Plasma for Bioapplications
(2020-06-22)
Chen, Tsung-Wen
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Liu, Chih-Tung
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Chen, Chao-Yu
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Wu, Mu-Chien
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Chien, Po-Chien
This study systematically analyzed reactive species generated with self-built helium-based low-temperature atmospheric-pressure plasma jet (He-APPJ); we measured the hydroxyl radical (OH) and hydrogen peroxide (H2O2) above surfaces of plasma-treating solutions and in plasma-treated medium (PTM) of different solutions, including deionized water, phosphate buffered saline, and Dulbecco's modified Eagle medium. The effects of adding O(2)into He working gas on OH and H(2)O(2)generation were discussed. The MCF7 cell responses to plasma treatment were also observed. The OH emission (309 nm) in He-APPJ and above surfaces of plasma-treating solutions were analyzed through optical emission spectroscopy, and concentrations of OH and H(2)O(2)in different solutions were measured using terephthalic acid and Amplex Red, respectively. In our plasma system, it was observed that higher conductivity of solutions may cause stronger OH emission above solution. The ingredients of the solution may affect the concentrations of OH and H2O2. Addition of 0.1% O(2)generates strongest OH emission above surfaces of plasma-treating solution with our He-APPJ, and thus, the highest H(2)O(2)concentration in PTM. The MCF7 cell viability is influenced by the H(2)O(2)concentration in PTM. The results of this study can facilitate further study of plasma effects on PTM and cell culture.
Chaos generalized synchronization of an inertial tachometer with new Mathieu-Van der Pol systems as functional system by GYC partial region stability theory
(2012-03-01)
Yang, Cheng-Hsiung
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Chen, Tsung-Wen
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Li, Shih-Yu
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Chang, Ching-Ming
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Ge, Zheng-Ming
A new strategy to achieve generalized chaos synchronization by GYC partial region stability theory is proposed. By using the GYC partial region stability theory the Lyapunov function is a simple linear homogeneous function of error states and the controllers are more simple and introduce less simulation error because they are in lower order than that of traditional controllers. In simulation examples, an inertial tachometer system and Mathieu-Van der Pol system are used. (C) 2011 Elsevier B.V. All rights reserved.
Tooth bleaching by using a helium-based low-temperature atmospheric pressure plasma jet with saline solution
(2017-11-01)
Cheng, Yun-Chien
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Wu, Chia-Hua
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Liu, Chih-Tung
;
Lin, Chia-Yung
;
Chiang, Hsuan-Ping
In this study, tooth bleaching was performed by using a helium-based low temperature atmospheric-pressure plasma jet (He-APPJ) with saline solution to avoid ozone and hydrogen peroxide (H2O2) harm. In this study, tooth samples were treated through three approaches, namely a helium flow with saline, H2O2 gel, and He-APPJ with saline. The bleaching efficacy of the He-APPJ treatment was the highest among the three groups. Furthermore, scanning electron microscopy images showed that enamel treated with He-APPJ was much less damaged than that treated with H2O2 gel. In addition, ozone tests showed that APPJ produced little ozone (<0.35ppm). In conclusion, He-APPJ with saline solution achieves higher bleaching efficacy and is less harmful than methods that use H2O2 gel.