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Influence of Fabricating Process on Gas Sensing Properties of ZnO Nanofiber-Based Sensors

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Chinese Physics Letters 2011年第4期28卷 59-62页

作者： XU Le WANG Rui LIU Yong DONG Liang school of textiles Tianjin Polytechnic UniversityTianjin 300160

ZnO nanofibers are synthesized by an electrospinning method and characterized by x-ray diffraction(XRD)and scanning electron microscopy(SEM).Two types of gas sensors are fabricated by loading these nanofibers as the sensing materials and their performances are investigated in *** with the sensors based on traditional ceramic tubes with Au electrodes(traditional sensors),the sensors fabricated by spinning ZnO nanofibers on ceramic planes with Ag-Pd electrodes(plane sensors)exhibit much higher sensing *** sensitivity for the plane sensors is about 30 to 100ppm ethanol at 300℃,while the value is only 13 for the traditional *** response and recovery times are about 2 and 3s for the plane sensors and are 3 and 6s for the traditional sensors,*** minimum-detection-limit is also found for the plane *** improvements are explained by considering the morphological damage in the fabricating process for traditional *** results suggest that the plane sensors are more suitable to sensing investigation for higher veracity.

关键词： properties ceramic fibers

A numerical model to simulate the transient frictional viscoelastic sliding contact

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Friction 2024年第2期12卷 319-339页

作者： Dongze WANG Gregory de BOER Anne NEVILLE Ali GHANBARZADEH school of Mechanical Engineering University of LeedsLeeds LS29JTUK

Sliding motion has always been one of the major concerns when it comes to the analysis of viscoelastic contact problems.A new model simulating the transient sliding contact of smooth viscoelastic surfaces is developed in this *** taking the dry contact friction and the coupling between shear tractions and normal pressure into account,the effect of the early partial slip period,which is often neglected in the study of viscoelastic sliding contact problems,is investigated *** with solutions based on the frictionless assumption,the steady-state pressure profile is found to be slightly different under the effect of the partial slip regime,including a lower peak pressure and the shift of the contacting region in the direction opposite to the sliding ***,the time required for the viscoelastic contact to reach its steady state is delayed owing to the partial slip period preceding the global sliding motion.

关键词： contact mechanics frictional sliding viscoelasticity viscoelastic friction

Chipless textile electronics: human body-coupled fiber for wireless energy harvesting and signal transmission

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Science China Materials 2024年第7期67卷 2367-2368页

作者： Yixuan Wang Zuqing Yuan Guozhen Shen school of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

Wearable technology is rapidly advancing through the integration of electronic devices and textiles,enabling intelligent interaction between clothing and the surrounding *** electronics are specifically designed to provide functions such as sensing,computation,display,and ***,traditional wearable devices that rely on rigid von Neumann architectures and incorporate silicon chips face challenges in seamless integration,energy efficiency,and comfort[1–3].Difficulties arise when attempting to integrate complex circuits and electronic components,which are traditionally relied upon for signal modulation,into soft fibers[4,5].Recent reports have begun to explore alternative architectures for wearable devices that can incorporate electronics into a single fiber[6].However,this process presents challenges in simultaneously controlling energy capture and release within a single fiber.

关键词： fiber signal energy

A Deep Learning-Enabled Skin-Inspired Pressure Sensor for Complicated Recognition Tasks with Ultralong Life

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Research 2024年第1期2023卷 443-454页

作者： Yingxi Xie Xiaohua Wu Xiangbao Huang Qinghua Liang Shiping Deng Zeji Wu Yunpeng Yao Longsheng Lu school of Mechanical&Automotive Engineering South China University of TechnologyGuangzhouChina

Flexible full-textile pressure sensor is able to integrate with clothing directly,which has drawn extensive attention from scholars *** the realization of flexible full-textile pressure sensor with high sensitivity,wide detection range,and long working life remains *** recognition tasks necessitate intricate sensor arrays that require extensive data processing and are susceptible to *** human skin is capable of interpreting tactile signals,such as sliding,by encoding pressure changes and performing complex perceptual *** by the skin,we have developed a simple dip-and-dry approach to fabricate a full-textile pressure sensor with signal transmission layers,protective layers,and sensing *** sensor achieves high sensitivity(2.16 kPa^(−1)),ultrawide detection range(0 to 155.485 kPa),impressive mechanical stability of 1 million loading/unloading cycles without fatigue,and low material *** signal transmission layers that collect local signals enable real-world complicated task recognition through one single *** developed an artificial Internet of Things system utilizing a single sensor,which successfully achieved high accuracy in 4 tasks,including handwriting digit recognition and human activity *** results demonstrate that skin-inspired full-textile sensor paves a promising route toward the development of electronic textiles with important potential in real-world applications,including human–machine interaction and human activity detection.

关键词： Deep Skin utilizing

Adsorption of cationic copolymer nanoparticles onto bamboo fiber surfaces measured by conductometric titration

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Chinese Chemical Letters 2015年第9期26卷 1174-1178页

作者： Xiu-Ming Liu Dong-Qin He Kuan-Jun Fang school of textiles Tianjin Polytechnic University

Monosized nanoparticles of 57.3 nm were prepared by cationic emulsion polymerization using a polymerizable emulsifier *** adsorption of nanoparticles onto bamboo fibers was measured by conductometric *** results indicated that the adsorption capacity increased with increasing contact time until 120 *** equilibrium data for nanoparticles adsorption onto bamboo fibers were well fitted to the Langmuir ***,the monolayer adsorption capacity of nanoparticles in the concentration range（from 0.03 g/L to 0.6 g/L） studied,as calculated from Langmuir isotherm model at 25 C,was found to be 38.61 mg/g of *** SEM images showed that the nanoparticles form a uniform monolayer on bamboo fiber surfaces.

关键词： Adsorption Copolymer Cationic nanoparticles Bamboo fibers

Research on Evenness of Woollen Cashmere Yarn

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Journal of Donghua University(English Edition) 2009年第5期26卷 522-527页

作者：徐先林黄故李培玲 school of textiles Tianjin Polytechnic University

Parameters influencing the evenness of the woollen cashmere yarn were analyzed, and fifty batches of yams with fineness of 38.5 tex were used to study the quality control parameters in relation to the evenness. Through statistical analysis, the models of yarn evenness were built. Moreover, the relationship between the evenness of spinning yarn and roving yarn was also investigated. The results showed that a positive correlation existed between them, and the mount of thin place per kilometer was the most important factor which could influence the evenness of woollen cashmere yam. The influence of the amount of neps and thick place on the yam evenness was indistinctive. The conclusions obtained would be helpful to improve the precontrol ability on yarn evenness.

关键词： woollen cashmere yarn yarn evenness correlation

Preparation and Characterization of Temperature-Sensitive Hydrogels Composites by Coating Method

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Journal of Donghua University(English Edition) 2010年第4期27卷 469-476页

作者：刘书芳顾振亚 school of textiles Tianjin Polytechnic University

In this study,the hydrogels composites with coatings based on a temperature-sensitive linear copolymer of N-tert-butylacrylamide(NTBA)and acrylamide(AAm)on cotton fabrics have been *** cotton fabrics were coated using aqueous solution of the linear copolymer,1,2,3,4-butanetertracarboxylic acid(BTCA)as a cross-linker and sodium hypophosphite(SHP)as a catalyst,followed by drying and *** effects of cross-linking reaction conditions in coating process on water-impermeable ability of coated cotton fabrics were investigated in *** results indicate that the coated fabrics have temperature *** coatings of poly(NTBA-co-AAm)hydrogels were bonded on the surface of the cotton fabrics,as verified by SEM and optical microscopy,which gave the water-impermeable ability to the hydrogels ***,the hydrogels formed in the coating process also identified that - COOH of BTCA reacted with -NH2 in the linear polymer and formed three-dimensional network *** and XPS were used to characterize the cross-linking reaction of - COOH of BTCA and - OH of cellulose.

关键词： stimuli-sensitive polymers hydrogels coatings cotton fabric cross-linking

Super-hydrophobic and Self-cleaning PVDF Film Fabricated by Chemical Bath Deposition

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Journal of Donghua University(English Edition) 2010年第4期27卷 451-457页

作者：郑振荣顾振亚霍瑞亭叶永红张之秋 school of textiles Tianjin Polytechnic University

Self-cleaning surfaces have received a great deal of attention recently,both in theoretical studies and commercial *** self-cleaning surface of lotus leaf is hydrophobic and rough,showing a micro-and nano-scale *** micro-reliefs of lotus leaf were mimicked using polyvinylidene fluoride(PVDF)film and nano-scale peaks on the top of the micro-reliefs were implemented by the reaction between methyltrichlorosilane and the reactive groups of PVDF film treated by oxygen plasma.A lotus-leaf-like surface of the PVDF film was clearly observed by scanning electronic microscopy(SEM)and atomic force microscope(AFM).Elemental composition analysis by X-ray photoelectron spectroscopy(XPS)revealed that the material of the nanostructure of PVDF film was *** superhydrophobic property of the mimicked self-cleaning surface was validated by the water contact angle and sliding angle on the lotus-leaf-like PVDF film,which were 156.6° and 4°,*** this case,water droplets can easily move across the PVDF film surface,carrying dirt particles away,leaving no contamination.

关键词： lotus effect self-cleaning superhydrophobic property chemical bath deposition

Heterogeneous Fenton degradation of azodyes catalyzed by modified polyacrylonitrile fiber Fe complexes: QSPR (quantitative structure peorperty relationship) study

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Journal of Environmental Sciences 2013年第7期25卷 1469-1476页

作者： Bing Li Yongchun Dong Zhizhong Ding Division of Textile Chemistry & Ecology School of Textiles Tianjin Polytechnic University

The amidoximated polyacrylonitrile （PAN） fiber Fe complexeswere prepared and used as the heterogeneous Fenton catalysts for thedegradation of28 anionicwater soluble azodyes inwater under visible irradiation. The multiple linear regression （MLR） methodwas employed todevelop the quantitative structure property relationship （QSPR） model equations for thedecoloration and mineralization of azodyes. Moreover, the predictive ability of the QSPR model equationswas assessed using Leave-one-out （LOO） and cross-validation （CV） methods. Additionally, the effect of Fe content of catalyst and the sodium chloride inwater on QSPR model equationswere also investigated. The results indicated that the heterogeneous photo-Fentondegradation of the azodyeswithdifferent structureswas conducted in the presence of the amidoximated PAN fiber Fe complex. The QSPR model equations for thedyedecoloration and mineralizationwere successfullydeveloped using MLR technique. MW/S （molecularweightdivided by the number of sulphonate groups） and N N=N （the number of azo linkage） are considered as the most importantdetermining factor for thedyedegradation and mineralization, and there is a significant negative correlation between MW/S or N N=N anddegradation percentage or total organic carbon （TOC） removal. Moreover, LOO and CV analysis suggested that the obtained QSPR model equations have the better prediction ability. The variation in Fe content of catalyst and the addition of sodium chloridedid not alter the nature of the QSPR model equations.

关键词： azodye heterogeneous Fentondegradation quantitative structure property relationship polyacrylonitrile fiber Fe complex