Plasma Science

Welcome to the Wang Research Group

We are developing and integrating new types of nano-materials and sensors with plasma science.

Laboratory News

  • Juan-Ying Tasi, Teng-Hsuan Pan, and Jia-Hua Liu were awarded “Popularity Award” in 2021 Sakura Science. (2021.02)

  • Our research group published a paper in Surface and Coatings Technology, "Dense and anti-corrosion thin films prepared by plasma polymerized hexamethyldisilazane for applications in metallic implants”. (2021.01)

  • Congratulation!!! Kate Muneekaew passed the PhD thesis defense. (2021.01)

  • Ruei-Yu Dung was awarded Honorable mention Oral Presentation Award” in 2020 TwIChE. (2020.10)

  • Kate Muneekaew, were awarded Merit Poster Award” in 2020 TwIChE. (2020.10)

  • Teng-Hsuan Pan, Jia-Hua Liu, and Jia-Ming Kuo were awarded Honorable mention Poster Award” in 2020 TwIChE. (2020.10)

  • Congratulation!!! Zhong-Rui Wu passed the oral defense. (2020.08)

  • Congratulation!!! Yu-Chen Wang passed the oral defense. (2020.07)

  • Welcome to Yung-Jie Lin, Po-Jui Hsu, Yi-Hsuan Chien, Hsu-Zhe Ming, and Li-Ling Lo join the our research group. (2020.07)

  • Our research group published a paper in Plasma Processes and Polymer, “Atmospheric pressure plasma jet‐assisted copolymerization of sulfobetaine methacrylate and acrylic acid”. (2020.01)

  • Congratulation for Tai-Chun Tsai was awarded "Best Oral Presentation Award" in ISPlasma2019/IC-PLANTS2019. (2019.03)

  • Congratulation for Wei-Ting Ting and Tai-Chun Tsai were awarded , "Best Oral Presentation Award" in The Taiwan-Japan Joint Workshop. (2019.01)

Research News

Dense and anti-corrosion thin films prepared by plasma polymerized hexamethyldisilazane for applications in metallic implants, Wei-Ting Ting, Kao Shoa Chen, and Meng-Jiy Wang, Surface and Coatings Technology, (2021)

Plasma polymerized hexamethyldisilazane (ppHMDSZ) thin films with specific thickness and density coated on substrates (ppHMDSZ/substrate) to promote the corrosion resistance for the potential applications in metallic implants is reported in this study. Comparing with the conventional anti-corrosion thin film coatings, plasma polymerization method provided an effective, dry, and simpler process, which allowed to prepare dense thin films with the thickness of a few hundred nanometers. This study proposed that the anti-corrosion behavior could be correlated closely to the density of thin film coated on stainless steel (SS) that can be precisely controlled by the plasma deposition time. The physico-chemical properties of the as-prepared ppHMDSZ thin films were evaluated by field-emission scanning electron microscope (FE-SEM), water contact angle (WCA), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), and electron spectroscopy for chemical analysis (ESCA). The corrosion resistance of the ppHMDSZ coated stainless steel (ppHMDSZ/SS) was improved by depositing ~140 nm in thickness and 1.15 g/cm3 in density which reduced 90% of the original corrosion performance against the corrosion in Hank's solution, measured by potentiodynamic polarization tests. The resultant ppHMDSZ thin film coatings allowed to protect substrates toward corrosion and can be further applied in implants for tissue engineering and biomaterials.

Atmospheric pressure plasma jet‐assisted copolymerization of sulfobetaine methacrylate and acrylic acid, Yueh‐Han Huan, Meng‐Jiy Wang, Plasma Processes and Polymer, (2020)

In this study, the copolymerization of sulfobetaine methacrylate (SBMA) and acrylic acid (AA) was carried out by atmospheric pressure plasma jet (APPJ) treatment. By applying APPJ on the precursor solutions, OH radicals and the other reactive species were generated to induce the polymerization processes in solutions. The molecular weight and composition of the resultant poly(SBMA‐co‐AA) can be easily modulated by varying the plasma parameters including treatment time and applied power. The anti‐biofouling effects of the resultant poly(SBMA‐co‐AA) against biomolecules including lysozyme, bovine serum albumin (BSA), and L‐929 mouse fibroblast cells revealed excellent fouling resistance. This study demonstrated that APPJ‐assisted copolymerization is a chemical initiator free process and can provide a simpler alternative route for the preparation of copolymers with designated compositions and advantageous functions.

Biocomposite scaffold preparation from hydroxyapatite extracted from waste bovine bone, Quoc-Phong Ho, The-Duong Tao, Lien-Huong Huynh and Meng-Jiy Wang, Green Processing and Synthesis, (2019)

This study was conducted to fabricate scaffold from polylactic acid (PLA) and hydroxyapatite (HA) extracted from waste bovine bone for enhancing both mechanical and biocompatible properties. After pretreatment in dilute NaOH solution, the bone was calcined at 900°C for 6 h, ball milled and converted to HA. Factors that affect the formation of HA were investigated. Experimental results showed that HA particles with crystal size < 100 nm and 99% crystallinity could be obtained at 90°C, pH 11 and 35 mM H3PO4 solution followed by 4 h calcination at 900°C. By using non-solvent induced phase separation method, PLA scaffolds with pore size and surface area of 22.6 μm and 25.7 m² /g, respectively, containing different hydroxyapatite were successfully prepared. Tensile strength of scaffolds increased due to effective support by HA grafted collagen. PLA scaffolds containing HA were more degradable than PLA scaffolds and PLA scaffolds containing HA grafted collagen. Cell culture results showed that cell density increased significantly on porous scaffolds than that on the dense scaffolds. Moreover, cell density also increased significantly on the scaffold containing HA grafted collagen than that on the scaffold with pure HA.

Microwave plasma treated composites of Cu/Cu2O nanoparticles on electrospun poly(N-vinylpyrrolidone) fibers as highly effective photocatalysts for reduction of organic dyes and 4-nitrophenol, Saitong Muneekaewa, Kai-Cheng Changa, Alfin Kurniawana, Yuki Shirosakib, and Meng-JiyWanga, Journal of the Taiwan Institute of Chemical Engineers, (2019)

Self-standing photocatalytic materials based on transition-metal decorated electrospun fiber mat have attracted considerable attention for photodegradation of toxic refractory organic pollutants in the environment. In this study, poly(N-vinylpyrrolidone)/copper(II) nitrate fibers (Cu/PVP-F) were prepared by electrospinning of PVP/Cu(NO3)2 solution followed by crosslinking using microwave-induced argon plasma (MAP) to produce Cu/Cu2O composites on the surface of fibers. The optimization for the electrospinning fibers was conducted such that the optimized electrospun composite fibers exhibited excellent visible light photocatalytic activity, corresponding to the narrowest band gap energy based on photoluminescence analyses. Moreover, the experimental results showed that the electro-spinning Cu/PVP-F fibers treated with MAP revealed the highest rate of photodegradation efficacy toward methyl orange (MO) and 4-nitrophenol (4- NP), that could be employed in the subsequent photocatalysis cycles with good recovery.

Single Step and Mask-Free 3D Wax Printing of Microfluidic Paper-Based Analytical Devices for Glucose and Nitrite Assays, Cheng-Kuang Chiang, Alfin Kurniawan, Chen-Yu Kao, Meng-Jiy Wang, Talanta, (2019)

Microfluidic paper-based analytical devices (μPADs) have recently emerged as a simple, portable, user-friendly, and affordable alternative to more instrument-intensive analytical approaches for point-of-care testing (POCT), food safety analysis, and environmental monitoring. However, most of the existing methods for the fabrication of μPADs still face a great challenge because of different trade-offs among cost, convenience, and the pattern resolution. In this work, we report a facile one-step approach to prepare a μPAD using an affordable, easy-to-build 3D printer to generate patterns of solid wax on laboratory filter paper. The presented wax printing method did not require the use of predesigned masks and an external heat source to form complete hydrophobic wax barrier through the use of a custom-made extruder. The results revealed a strong linear relationship (R² = 0.985) between the nominal and the printed widths of the wax barriers. The achievable resolution of the wax barrier printed on filter paper was 468 ± 72 µm, which was lower than previously reported minimum barrier feature sizes achieved by wax printing and other wax patterning techniques, such as stamping and screen-printing. The analytical utility of the fabricated μPADs was evaluated for colorimetric nitrite and glucose detection in artificial solutions. It was found that the fabricated μPADs provided adequate accuracy and reproducibility for quantitative determination of nitrite and glucose within concentration ranges relevant to the disease detection in human saliva and urine. The wax printing approach reported here provides a simple, rapid, and cost-effective fabrication method for paper-based microfluidics and may bring benefits to medical diagnostics in the developing world.

Department of Chemical Engineering, National Taiwan University of Science and TechnologyNo.43, Keelung Rd., Sec.4, Da'an Dist., Taipei 10607, Taiwan Tel: +886-2-27333141 #3656