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Qingbo Xu,Xinyu Wang,Wei Xu,Yanyan Zhang,Zhenzhen Xu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
Immobilizing inorganic or organic particles on cotton fabric to increase the surface roughness, followed by coatingwith low surface reagents to reduce the surface energy, are the dominant strategies to prepare the superhydrophobic cottonsurface. However, the inorganic or organic particles can easily fall off the surface of the fabrics. Thus, the surface roughnessof the fabric could be reduced during the process, resulting in the poor durability of the superhydrophobic fabric. In this work,the surface of the cotton fabric was etched by cellulase. Following this, the treated fabric was grafted using a diblockcopolymer (poly[(methyl methacrylate)-b-(2-(dimethylamino)ethyl)] (PMMA-b-PDMAEMA)), which was synthesizedfollowing the reversible addition-fragmentation chain transfer (RAFT) polymerization process. The mist polymerizationtechnology was used for the process. The coatings successfully endowed the cotton fabric with superhydrophobic properties. The maximum WCA value recorded was 159.9 °. The treated fabric exhibited excellent mechanical and chemical stability. Moreover, the modified cotton sample also exhibited good self-cleaning effects in the presence of solid dust and liquidcontaminants. It also exhibited excellent oil-water separation properties. Therefore, the superhydrophobic fabric preparedusing a combination of the etching method and mist polymerization technology can find its potential application in home andindustrial areas.
Identifying of Digital Signals Based on Manifold Learning
Qingbo Ji,Boyang Feng,Yun Lin,Zheng Dou,Zhiqiang Wu,Zhiping Zhang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.2
Modulation type is one of the most important characteristics used in signal recognition. An algorithm to realize signal modulation identification is proposed in this paper. We applied wavelet transformation and STFT to the signal, and then used manifold learning method to reduce the high dimension and extracted the recognition feature. The proper threshold value was set as the classifier to achieve the purpose of recognizing 4 kinds of signals (MASK, MFSK, MPSK,QAM) in Gauss white noise environment. The algorithm requires priori signal information no other than signal-to-noise rate. Simulation result indicates the algorithm achieves good performance.
Effect of characteristics of submicrometer powder on the sintering behaviors of Al2O3 ceramic
Qingbo Tian,Jinshan Dai,Zhijie Lv,Tongguang Zhai 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.7
The sintering behaviors of high purity Al2O3 ceramics prepared from a submicron-scale powder were investigated. The effectsof ball milling on the evolution of alumina powders’ compressibility, sinterability, grain growth and microstructure duringsintering process were studied. It was observed that the relative density of the Al2O3 ceramics increased with increasingcompaction pressure on the green compacts and the sintering temperature. However, the applied pressure had less influenceon the relative density of ceramics sintered from green compact with narrower size distribution and finer powder. The fastgrain growth of the Al2O3 ceramics occurred in different temperature ranges and was influenced by milling time and formingmethods. The effect of milling on the microstructural evolution of alumina during sintering was also discussed.
Qingbo Xu,Xiating Ke,Yanyan Zhang,Feiya Fu,Xiangdong Liu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.11
In this study, durable antibacterial cotton fabrics were prepared by a simple two-step impregnation method. Firstly, thioglycolic acid (TGA) was grafted onto cotton fabric via esterification with the hydroxyl groups of cellulose, then silver nanoparticles (Ag NPs) were immobilized on the cotton fabric surface via coordination bonds with the TGA thiol groups. As a result, the mean size of Ag NPs coating on the cotton fabric is around 74 nm, and these functionalized cotton fabrics show superior antibacterial properties and excellent laundering durability. After withstand 50 laundering cycles, the obtained cotton fabrics still showed outstanding bacterial reduction rates (BR) against both S. aureus and E. coli, and the rates are all higher than 97 %. Therefore, this method to prepare antibacterial cotton fabric shows great potential applications in socks, cosmetic, and medical textiles.
Qingbo Xu,Xinyu Wang,Jing Zhou,Peng Wang,Yanyan Zhang,Qian Chen 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
Improving the surface roughness of cotton fabric is one of the main strategies to prepare superhydrophobic cotton fabric. To improve the surface roughness of fabric, it is advisable to immobilize inorganic/organic particles on the surface of cottonfabric. However, the durability of the superhydrophobic cotton fabric is very poor due to the inorganic/organic particlesare easily detachable from the fabric surface. In this work, a mild eutectic solvent prepared by choline chloride and oxalicacid was used to etch the cotton fabric, making the surface of the cotton fabric have many ravines. These ravines on the cottonfabric can be used the embedded the silica particles, thus making the silica particles firmly immobilized on the cottonfibers. Then, the treated cotton fabric was coated with polydimethylsiloxane (PDMS). As a result, the water contact angleof the finished fabric was reached at 156.9°. In addition, the superhydrophobic cotton fabric constructed by silica particlesand PDMS via “Mosaic Mode” showed excellent mechanical and chemical stability. Therefore, the finished fabric has greatpotential application in the self-cleaning and oil–water separation fields.
Qingbo Xu,Lili Ying,Xinyu Wang,Yanyan Zhang,Peng Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
Cotton fabric is easy to breed bacteria due to its porous structure and easy wettability, resulting in poor quality ofcotton fabric and harm to human health. In order to prepare antibacterial and antifouling cotton fabric, the present workdeveloped a new strategy. The acryloyl chloride (AC) was covalently linked to the surface of cotton fabric by nucleophilicsubstitution reaction, leading the surface of fabric to have the C=C bonds. Then, the C=C bonds on the treated fabric surfacewere polymerized with the allyltrimethylammonium chloride (ATAC) via mist polymerization technology, thus making thepoly(allyltrimethylammonium chloride) (PTAC) was grafted onto the cotton fabric via grafting through method. As a result,the finished fabric showed excellent antibacterial effect against E. coli and S. aureus, with the bacterial reduction (BR) rateswere higher than 99.0 %. Moreover, even after 50 laundering cycles, the BR rates of treated fabric against E. coli and S. aureus were also remained 95.8 %, exhibiting excellent durability. The finished cotton fabric was also showed outstandingantifouling for both bacterial and protein. The antibacterial and antifouling cotton fabric prepared by mist polymerizationtechnology and grafting through method has a great potential application in the household and consumer textiles.
Qingbo Xu,Peng Wang,Yanyan Zhang,Changlong Li 한국섬유공학회 2022 Fibers and polymers Vol.23 No.2
Immobilizing inorganic particles such as zinc oxide (ZnO), titanium dioxide (TiO2), silver nanoparticles (Ag NPs)or grafting special biopolymer such as chitosan on cotton fabrics is the main method to prepare antibacterial and ultraviolet(UV) protective cotton fabrics. However, poor durability and complex finishing methods are still of the main defects ofantibacterial and UV protective fabric samples. In the present work, the Ag/TiO2 colloid solution was prepared with using thecarboxymethyl chitosan (CMC) as a stabilizer, then the CMC and Ag/TiO2 composite nanoparticles were coated on the fabricvia finishing technology of pad-dry-cure. As a result, the modified fabric showed excellent antibacterial and UV protectiveproperties, with the values of bacterial reduction (BR) and ultraviolet protection factor were reached at 99.5 % and 79.0,respectively. Moreover, even after 50 washing cycles, these properties of the finished fabrics were not obviously reduced. These results demonstrated that the finished fabric sample has durable antibacterial and UV protective properties which couldhas a great potential application in the field of medical and outdoor apparel.
Preparation of Durable Superhydrophobic Cotton Fabric for Selfcleaning and Oil-water Separation
Qingbo Xu,Xiating Ke,Yanyan Zhang,Peng Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
Improving the surface roughness and reducing the surface energy are the main strategies for constructing cottonfabrics with superhydrophobic surface. However, the complex finishing process and poor durability still impede theproduction and application of superhydrophobic cotton fabrics. Therefore, it is critical to produce superhydrophobic fabricswith excellent durability via a noncomplicated method. In this work, monomers of methyl methacrylate (MMA) andtrifluoroethyl methacrylate (TFMA) were polymerized via free radical polymerization to produce a fluoropolymer. Then, thefabric was coated with the fluoropolymer to construct a superhydrophobic surface via the pad-dry-cure technology. TheTFMA unit in the fluoropolymer had lower surface energy than the MMA unit. Under the high-temperature curing condition,the MMA unit in the fluoropolymer was grafted onto the cotton fabric via transesterification, and the TFMA was exposed onthe fabric surface. The finished fabric showed durable superhydrophobic properties, outstanding oil-water separationproperties, and excellent self-cleaning properties. Given the results, the finished fabric has great potential application inclothing and industrial fields.
Qingbo Xu,Xinyu Wang,Lili Yin,Yanyan Zhang,Peng Wan 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
In this work, the durable superhydrophobic cotton fabric was successfully constructed by coated with polystyrene(PS) latex particles and polydimethylsiloxane (PDMS) via mist polymerization finishing technology. As a result, the watercontact angle (WCA) of the finished fabric was arrived at 158.1 °, reaching the superhydrophobic level. Even the finishedfabric after withstand 1400 abrasion cycles or 50 washing cycles, the WCA values of treated fabric were also higher than154.0 °, exhibiting excellent mechanical durability. In addition, the superhydrophobic surface of finished fabric was alsoshowed outstanding chemical durability. The finished fabric with such excellent superhydrophobic properties was showedgood oil-water separation properties, the separation efficiency (η) values of the SCF-2 sample as a filter material forchloroform/water and n-hexane/water mixtures were reached 99.6% and 99.1 %, respectively. Moreover, even the SCF-2sample after withstand 50 separation cycles for mixtures, the η values were not obviously reduced. The finished fabric wasalso showed outstanding self-cleaning properties. More interesting that the desired properties of finished fabric were notobviously reduced after the finishing process. Therefore, in consideration of its amazing performances, it is expected that thefinished fabric can be used as a promising material for self-cleaning, oil-water separation, and other potential applicationareas.