The influence of mercerization on cotton varieties from Africa,Xinjiang and Australia was studied. The micro-morphology,mechanical property and crystalline structure were analyzed before and after mercerization. Merce...The influence of mercerization on cotton varieties from Africa,Xinjiang and Australia was studied. The micro-morphology,mechanical property and crystalline structure were analyzed before and after mercerization. Mercerization made the surface of fibers smoother which resulted in improved luster of fiberes with better results observed in Australia,Xinjiang and Africa cotton varieties respectively. Although fiber strenth increased due to orientation of intra fiber cellulose chains,there was a general in the crystallinity index amongst the three varieties of cotton after mercerization.Reduced crystallinity is a function of improved processability and thus Australian cotton is more processable than cotton from Africa and Xinjiang.展开更多
Wearable pressure sensors having versatile device structures have been extensively investigated to achieve high sensitivity under mechanical stimuli.Here,we introduce piezoelectric pressure sensors based on fabrics wo...Wearable pressure sensors having versatile device structures have been extensively investigated to achieve high sensitivity under mechanical stimuli.Here,we introduce piezoelectric pressure sensors based on fabrics woven using polyvinylidene fluoride(PVDF)weft and polyethylene terephthalate(PET)warp yarns with different weave structures:1/1(plain),2/2,and 3/3 weft rib patterns.The dependence of the pressure-sensing performance on the weave pattern is demonstrated with an actual large-scale fabric up to the~2 m scale.An optimized pressure sensor with a 2/2 weft rib pattern produced a high sensitivity of 83 mV N−1,which was 245%higher than that of the 1/1 pattern.The detection performance of the optimal fabric was extensively evaluated with a variety of ambient input sources,such as pressing,bending,twisting,and crumpling,as well as various human motions.Further,a large allfabric pressure sensor with arrayed touch pixel units demonstrated highly sensitive and stable sensing performance.展开更多
文摘The influence of mercerization on cotton varieties from Africa,Xinjiang and Australia was studied. The micro-morphology,mechanical property and crystalline structure were analyzed before and after mercerization. Mercerization made the surface of fibers smoother which resulted in improved luster of fiberes with better results observed in Australia,Xinjiang and Africa cotton varieties respectively. Although fiber strenth increased due to orientation of intra fiber cellulose chains,there was a general in the crystallinity index amongst the three varieties of cotton after mercerization.Reduced crystallinity is a function of improved processability and thus Australian cotton is more processable than cotton from Africa and Xinjiang.
基金supported by grants from the National Research Foundation of Korea (NRF-2016M3A7B4910151 and NRF-2021R1A2C2013501).
文摘Wearable pressure sensors having versatile device structures have been extensively investigated to achieve high sensitivity under mechanical stimuli.Here,we introduce piezoelectric pressure sensors based on fabrics woven using polyvinylidene fluoride(PVDF)weft and polyethylene terephthalate(PET)warp yarns with different weave structures:1/1(plain),2/2,and 3/3 weft rib patterns.The dependence of the pressure-sensing performance on the weave pattern is demonstrated with an actual large-scale fabric up to the~2 m scale.An optimized pressure sensor with a 2/2 weft rib pattern produced a high sensitivity of 83 mV N−1,which was 245%higher than that of the 1/1 pattern.The detection performance of the optimal fabric was extensively evaluated with a variety of ambient input sources,such as pressing,bending,twisting,and crumpling,as well as various human motions.Further,a large allfabric pressure sensor with arrayed touch pixel units demonstrated highly sensitive and stable sensing performance.
