Ding B, Li C, Miyauchi Y, et al. Formation of novel 2D polymer nanowebs via electrospinning [J]. Nanotechnology, 2006, 17(15): 3685.
摘要的思路層次
- We have found a procedure for generating novel two-dimensional (2D)
nanowebs in three-dimensional (3D) fibrous mats by optimization of various
processing parameters during electrospinning.
我們做了什么 - The electrospun fibres act as a support for the ‘fishnet-like’ nanowebs comprising interlinked one-dimensional (1D) nanowires.
什么樣的結構 - The average diameter of the nanowires contained in typical nanowebs is about one order of magnitude less than that of conventional electrospun fibres.
結構的詳細信息 - due to theelectrically forced fast phase separation of the charged droplets which moveat high speed between the capillary tip and the collector.
結構形成機理 - strongly affected by the applied voltage, ambient relative humidity, kinds ofsolvents, solution concentration and distance between the capillary tip andthe collector.
結構形成條件
介紹部分
- 簡介下優點以及歷史
- 溶劑揮發不完全形成的缺陷薄膜可調控
- 高比表面積可用在探測，過濾和組織工程。越細越好，前人：低溶度和加鹽
- 我們做到了低于50 nm
PAA實驗部分
- 解釋缺陷產生原因
PAA的SEM水中和乙醇中，濃度：6 wt%, 電壓：30 kV, 距離 15 cm 相對濕度 20%
缺陷部分變成網
The formation of these webs from films was considered to bedue to the fast phase separation of polymer and solvent in thecharged droplet. - 濕度的影響很重要
直接影響揮發速度，影響揮發，增大直徑。 - 電壓
20kv看不到web結構。30kv可以看到細細的spider。
6% 濃度看不到啥網，8%下看到一點。10%下多多滴。
** Therefore, the shape, diameter and uniformity of holes in PAA nanowebs could be adjusted by changing the solution concentrations. **
PA 6部份
- 電壓影響
形成蛛網的關鍵在電壓哦
濃度 15%，距離15 cm，相對濕度 20%，電壓為10（小區域網），20，30kv（最多網）。 而且對濕度不敏感哦。因為抗化學性好，只能溶解在少數溶劑中。水不溶PA 6。 - 距離影響
nanowebs are strongly affected byspinning distance.
5cm 處伸展不開。25 cm充分展開。
- 典型例子
20 % 濃度，25kv，15 cm 20%濕度
結論
- In summary, we have demonstrated the fabrication of PAA
and nylon-6 nanowebs which are stacked layer-by-layer and
widely distributed in the 3D structure of fibrous mats.
一句話總結我們做了啥 - The development of PAA nanowebs indicated the process of
formation of nanowebs.
復述實驗第一部份 - The splitting of defect films into nanowebs occurred only under certain conditions, such as high applied voltage, low relative humidity and fast phase separation between polymers and solvents.
形成關鍵：四個條件 - Meanwhile, the morphologyand area density of nanowebs were an overall result of variouselectrospinning operational parameters like relative humidity,applied voltage, kinds of solvents, spinning distance andsolution concentration.
四個條件疊加結果 - one-tenth that of common electrospun fibres.
效果：達到1/10 - Up until now, the formation of defect films was the usual phenomenon during electrospinning. However, now possibilities have expanded with our research, and other materials with electrospinnability also have the possibility of forming nanowebs.
我們化腐朽為神奇：升華主題。。。
