The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Ko-shao Chen - One of the best experts on this subject based on the ideXlab platform.
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Effect of Plasma Gas Flow Direction on Hydrophilicity of Polymer by Small Zone Cold Plasma Treatment and Hydrophobic Plasma Treatment
International Journal of Distributed Sensor Networks, 2009Co-Authors: Ko-shao Chen, Shu-ju Chang, Tzu-piao TangAbstract:Plasma treatment is the most popular surface modification process of polymers. A small cold Plasma Zone treatment is an important modification technique in modern industry. In this study, the effect of gas flow direction on Plasma treatment was investigated. In order to decrease the Plasma Zone area, we added a separate cylinder to surround the upperelectrode.TheseparatecylinderiseffectiveinlimitingthePlasmadischargearea, and we could find a light and dark area in the vacuum chamber. After O2 Plasma treatment, the result shows that only PP nonwoven in the discharge area became hydrophilic, but the other position away from the Plasma Zone was not affected. The water adsorption of PP nonwoven increased from 34.8% to 537.4%. When the sample is further from the Plasma Zone, near the up stream of gas flow, the surface property is less hydrophilic. The water contact angle analysis of PS and glass shows the same results as those of PP nonwoven. But PET in Plasma Zone or dark Zone (Plasma Zone: 75 to 31, dark Zone: 75 to 52) both show hydrophilic property. The wettability effect in the dark Zone may be due to the UV-light irradiation in the process of Plasma excitation.
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The glow and no glow Zone effect on surface wettability modified in O2 or hexamethyldisilazane cold Plasma treatment
Desalination, 2008Co-Authors: Ko-shao Chen, Shu-ju Chang, Su-chen ChenAbstract:Abstract Small cold Plasma Zone treatment is an important modification technique in modern industry. In this study, the effect of gas flow direction on Plasma treatment was investigated. In order to decrease the Plasma Zone area, we added a separate cylinder to surround the upper electrode. Separate cylinder is effective to limit Plasma discharge area, and we could find a light and dark area in the vacuum chamber. After O2 Plasma treatment, the result shows that only PP non-woven in the discharge area became hydrophilic, but other position away from the Plasma Zone was not affected. The water adsorption of PP non-woven increased from 34.8% to 537.4%. When sample is more far from the Plasma Zone, near the up stream of gas flow, the surface property is less hydrophilic. Water contact angle analysis of PS and glass shows the same results as those of PP non-woven. But PET in Plasma Zone or dark Zone (Plasma Zone: 75–31°, dark Zone: 75–52°) both shows hydrophilic property. The wettability effect in dark Zone may be due to the UV-light irradiation in the process of Plasma excitation.
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Effect of Plasma Gas Flow Direction on Hydrophilicity of Polymer by Small Zone Cold Plasma Treatment
Synthesis and Reactivity in Inorganic Metal-organic and Nano-metal Chemistry, 2008Co-Authors: Ko-shao Chen, Shu‐ru ChangAbstract:Plasma treatment is the most popular surface modification process of polymer. Small cold Plasma Zone treatment is an important modification technique in modern industry. In this study, the effect of gas flow direction on Plasma treatment was investigated. In order to decrease the Plasma Zone area, we added a separate cylinder to surround the upper electrode. Separate cylinder is effective to limit Plasma discharge area, and we could find a light and dark area in the vacuum chamber. After O2 Plasma treatment, the result shows that only PP non‐woven in the discharge area became hydrophilic, but other positions away from the Plasma Zone were not affected. The water adsorption of PP non‐woven increased from 34.8% to 537.4%. When sample is more far from the Plasma Zone, near the up stream of gas flow, the surface property is less hydrophilic. Water contact angle analysis of PS and glass shows the same results as those of PP non‐woven. But PET in Plasma Zone or dark Zone (Plasma Zone: 75° to 31°, dark Zone: 75°...
J. Ráhel’ - One of the best experts on this subject based on the ideXlab platform.
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Effect of DCSBD Plasma treatment distance on surface characteristics of wood and thermally modified wood
Wood Science and Technology, 2020Co-Authors: R. Talviste, O. Galmiz, M. Stupavská, J. Ráhel’Abstract:This study focused on Plasma treatment of European beech ( Fagus sylvatica ) and heat-treated European beech surfaces with varying distance from the planar electrode of the diffuse coplanar surface barrier discharge. In addition to the treatment in the air, Plasma treatment was also carried out in O_2, CO_2, N_2 and Ar atmospheres. Treatment was differentiated between treatment in the active Plasma Zone and in the so-called Plasma afterglow region. Air Plasma treatment in the active Plasma Zone led to the well-known improvement of surface wettability of polar liquids due to increased polar part of surface free energy. Treatment in Plasma afterglow region caused the wettability decline of polar liquids and caused a more hydrophobic surface. The phenomenon was primarily present for air Plasma treatment. Oxygen-to-carbon ratio measured by X-ray photoelectron spectroscopy did not change with the treatment in air Plasma afterglow. Based on additional tests with pure cellulose paper and based on findings in previous studies, the reason for increased hydrophobicity was suggested to be degradation of hemicelluloses on the wood surface.
R. Talviste - One of the best experts on this subject based on the ideXlab platform.
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Effect of DCSBD Plasma treatment distance on surface characteristics of wood and thermally modified wood
Wood Science and Technology, 2020Co-Authors: R. Talviste, O. Galmiz, M. Stupavská, J. Ráhel’Abstract:This study focused on Plasma treatment of European beech ( Fagus sylvatica ) and heat-treated European beech surfaces with varying distance from the planar electrode of the diffuse coplanar surface barrier discharge. In addition to the treatment in the air, Plasma treatment was also carried out in O_2, CO_2, N_2 and Ar atmospheres. Treatment was differentiated between treatment in the active Plasma Zone and in the so-called Plasma afterglow region. Air Plasma treatment in the active Plasma Zone led to the well-known improvement of surface wettability of polar liquids due to increased polar part of surface free energy. Treatment in Plasma afterglow region caused the wettability decline of polar liquids and caused a more hydrophobic surface. The phenomenon was primarily present for air Plasma treatment. Oxygen-to-carbon ratio measured by X-ray photoelectron spectroscopy did not change with the treatment in air Plasma afterglow. Based on additional tests with pure cellulose paper and based on findings in previous studies, the reason for increased hydrophobicity was suggested to be degradation of hemicelluloses on the wood surface.
Shu‐ru Chang - One of the best experts on this subject based on the ideXlab platform.
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Effect of Plasma Gas Flow Direction on Hydrophilicity of Polymer by Small Zone Cold Plasma Treatment
Synthesis and Reactivity in Inorganic Metal-organic and Nano-metal Chemistry, 2008Co-Authors: Ko-shao Chen, Shu‐ru ChangAbstract:Plasma treatment is the most popular surface modification process of polymer. Small cold Plasma Zone treatment is an important modification technique in modern industry. In this study, the effect of gas flow direction on Plasma treatment was investigated. In order to decrease the Plasma Zone area, we added a separate cylinder to surround the upper electrode. Separate cylinder is effective to limit Plasma discharge area, and we could find a light and dark area in the vacuum chamber. After O2 Plasma treatment, the result shows that only PP non‐woven in the discharge area became hydrophilic, but other positions away from the Plasma Zone were not affected. The water adsorption of PP non‐woven increased from 34.8% to 537.4%. When sample is more far from the Plasma Zone, near the up stream of gas flow, the surface property is less hydrophilic. Water contact angle analysis of PS and glass shows the same results as those of PP non‐woven. But PET in Plasma Zone or dark Zone (Plasma Zone: 75° to 31°, dark Zone: 75°...
Tzu-piao Tang - One of the best experts on this subject based on the ideXlab platform.
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Effect of Plasma Gas Flow Direction on Hydrophilicity of Polymer by Small Zone Cold Plasma Treatment and Hydrophobic Plasma Treatment
International Journal of Distributed Sensor Networks, 2009Co-Authors: Ko-shao Chen, Shu-ju Chang, Tzu-piao TangAbstract:Plasma treatment is the most popular surface modification process of polymers. A small cold Plasma Zone treatment is an important modification technique in modern industry. In this study, the effect of gas flow direction on Plasma treatment was investigated. In order to decrease the Plasma Zone area, we added a separate cylinder to surround the upperelectrode.TheseparatecylinderiseffectiveinlimitingthePlasmadischargearea, and we could find a light and dark area in the vacuum chamber. After O2 Plasma treatment, the result shows that only PP nonwoven in the discharge area became hydrophilic, but the other position away from the Plasma Zone was not affected. The water adsorption of PP nonwoven increased from 34.8% to 537.4%. When the sample is further from the Plasma Zone, near the up stream of gas flow, the surface property is less hydrophilic. The water contact angle analysis of PS and glass shows the same results as those of PP nonwoven. But PET in Plasma Zone or dark Zone (Plasma Zone: 75 to 31, dark Zone: 75 to 52) both show hydrophilic property. The wettability effect in the dark Zone may be due to the UV-light irradiation in the process of Plasma excitation.