Zhang Hongdi
Qingdao University
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Publication
Featured researches published by Zhang Hongdi.
Chinese Physics B | 2012
Zheng Jie; Long Yunze; Sun Bin; Zhang Zhihua; Shao Feng; Zhang Hongdi; Zhang Zhiming; Huang Jia-yin
Electrospinning is a straightforward method to produce micro/nanoscale fibers from polymer solutions typically using an operating voltage of 10 kV?30 kV and spinning distance of 10 cm?20 cm. In this paper, polyvinyl pyrrolidone (PVP) non-woven nanofibers with diameters of 200 nm?900 nm were prepared by low-voltage near-field electrospinning with a working voltage of less than 2.8 kV and a spinning distance of less than 10 mm. Besides the uniform fibers, beaded-fibers were also fabricated and the formation mechanism was discussed. Particularly, a series of experiments were carried out to explore the influence of processing variables on the formation of near-field electrospun PVP nanofibers, including concentration, humidity, collecting position, and spinning distance.
Chinese Physics Letters | 2011
Tang Chengchun; Chen Jun-Chi; Long Yunze; Yin Hong-Xing; Sun Bin; Zhang Hongdi
We report on curled polyvinylpyrrolidone (PVP) microfibers fabricated by a modified electrospinning with a small nail as the tip collector. PVP (45 wt%) ethanol solution is electrospun under different working voltages ranging from 10 to 15, 20, 30 and 40 kV. It is found that with the increase of working voltage, the proportion of the curled fibers increases and the uniformity of the curled fibers improves, as well as the repeat distance of the curled structures reducing. Particularly, some curled fibers develop into helical structures under relatively high voltages. Further analyses indicate that the formation mechanism for the curled polymer fibers can be ascribed to electrical driven bending instability and/or mechanical jet buckling when hitting the collector surface. This modified electrospinning technique may be a cost-effective approach for the mass production of curled microfibers.
Archive | 2012
Long Yunze; Liu Shuliang; Tang Chengchun; Sun Bin; Zheng Jie; Zhang Hongdi; Li Meng-Meng
Archive | 2013
Long Yunze; Liu Shuliang; Sun Bin; Zhang Hongdi; Cao Guiquan
Archive | 2014
Long Yunze; Liu Lingzhi; Pang Nana; Zheng Jie; Sun Bin; Zhang Hongdi; Liu Shuai; Huang Rong
Archive | 2013
Long Yunze; Zhang Zhihua; Liu Shuliang; Zhang Hongdi; Ji Xinming; Sun Bin; Zhang Juncheng
Archive | 2013
Long Yunze; Zheng Jie; Huang Yuanyuan; Liu Shuliang; Sun Bin; Zhang Hongdi; Zhang Juncheng
Archive | 2013
Sun Bin; Long Yunze; Liu Shuliang; Huang Yuanyuan; Lin Dapeng; Zhang Hongdi; Zhang Juncheng
Archive | 2014
Long Yunze; Chen Shuai; Sheng Chenhao; Han Wenpeng; Dong Ruihua; Zhang Hongdi
Archive | 2014
Zhang Juncheng; Long Yunze; Zhang Hongdi; Sun Bin; Han Wenpeng