Ywu-Jang Fu
Vanung University
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Publication
Featured researches published by Ywu-Jang Fu.
Nanoscale | 2013
Jung-Tsai Chen; Ywu-Jang Fu; Quanfu An; Shen-Chuan Lo; Shu-Hsien Huang; Wei-Song Hung; Chien-Chieh Hu; Kueir-Rarn Lee; Juin-Yih Lai
A technique of layer-by-layer (LbL) self-assembly was used to prepare transparent multilayered gas barrier films consisting of graphene oxide (GO)/branched poly(ethylenimine) (BPEI) on a poly(ethylene terephthalate) substrate. The effect of the GO suspension pH on the nanostructure and oxygen barrier properties of the GO/BPEI film was investigated. The oxygen barrier properties of the assemblies were shown to be highly dependent on the pH. It was demonstrated that the film assemblies prepared using a GO suspension with a pH of 3.5 exhibited very dense and ordered structures and delivered very low oxygen transmission rates (the lowest was <0.05 cm(3) m(-2) day(-1)). The assemblies were characterized with ultraviolet-visible spectroscopy and ellipsometry to identify the film growth mechanism, and the result indicated a linear growth behavior. To analyze the nanostructure of the films, atomic force microscopy, transmission electronic microscopy, and grazing incidence wide-angle X-ray diffraction were used.
Langmuir | 2010
Ywu-Jang Fu; Hsuan-zhi Qui; Kuo-Sung Liao; Shingjiang Jessie Lue; Chien-Chieh Hu; Kueir-Rarn Lee; Juin-Yih Lai
A thin SiO(x) selective surface layer was formed on a series of cross-linked poly(dimethylsiloxane) (PDMS) membranes by exposure to ultraviolet light at room temperature in the presence of ozone. The conversion of the cross-linked polysiloxane to SiO(x) was monitored by attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray (EDX) microanalysis, contact angle analysis, and atomic force microscopy (AFM). The conversion of the cross-linked polysiloxane to SiO(x) increased with UV-ozone exposure time and cross-linking agent content, and the surface possesses highest conversion. The formation of a SiO(x) layer increased surface roughness, but it decreased water contact angle. Gas permeation measurements on the UV-ozone exposure PDMS membranes documented interesting gas separation properties: the O(2) permeability of the cross-linked PDMS membrane before UV-ozone exposure was 777 barrer, and the O(2)/N(2) selectivity was 1.9; after UV-ozone exposure, the permeability decreased to 127 barrer while the selectivity increased to 5.4. The free volume depth profile of the SiO(x) layer was investigated by novel slow positron beam. The results show that free volume size increased with the depth, yet the degree of siloxane conversion to SiO(x) does not affect the amount of free volume.
Carbon | 2014
Jung-Tsai Chen; Ywu-Jang Fu; Quanfu An; Shen-Chuan Lo; Yue-Zhe Zhong; Chien-Chieh Hu; Kueir-Rarn Lee; Juin-Yih Lai
Desalination | 2006
Ywu-Jang Fu; Chien-Chieh Hu; Kueir-Rarn Lee; Juin-Yih Lai
Microporous and Mesoporous Materials | 2011
Ywu-Jang Fu; Kuo-Sung Liao; Chien-Chieh Hu; Kueir-Rarn Lee; Juin-Yih Lai
Journal of Membrane Science | 2007
Chien-Chieh Hu; Ywu-Jang Fu; Sheng-Wen Hsiao; Kueir-Rarn Lee; Juin-Yih Lai
Chemical Engineering Science | 2014
Ywu-Jang Fu; Cheng-Lee Lai; Jung-Tsai Chen; Chung-Te Liu; Shu-Hsien Huang; Wei-Song Hung; Chien-Chieh Hu; Kueir-Rarn Lee
Separation and Purification Technology | 2008
Ywu-Jang Fu; Chien-Chieh Hu; Hsuan-zhi Qui; Kueir-Rarn Lee; Juin-Yih Lai
European Polymer Journal | 2007
Ywu-Jang Fu; Chien-Chieh Hu; Kueir-Rarn Lee; Hui-An Tsai; Ruoh-Chyu Ruaan; Juin-Yih Lai
Separation and Purification Technology | 2012
Cheng-Lee Lai; Ywu-Jang Fu; Jung-Tsai Chen; Quanfu An; Kuo-Sung Liao; Shih-Ching Fang; Chien-Chieh Hu; Kueir-Rarn Lee