Solution chemistry control to make well defined submicron continuous fibres by electrospinning: the (CH3CH2CH2O)4Ti/AcOH/poly(N-vinylpyrrolidone) system
Solution chemistry control to make well defined submicron continuous fibres by electrospinning: the (CH3CH2CH2O)4Ti/AcOH/poly(N-vinylpyrrolidone) system
复制标题
溶液化学控制通过静电纺丝制造轮廓分明的亚微米连续纤维：(CH3CH2CH2O)4Ti/AcOH/聚(N-乙烯基吡咯烷酮)系统
DOI：
10.1039/b601960a
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发表时间：
2006
影响因子：
--
通讯作者：
G. Larsen
中科院分区：
文献类型：
--
作者：
M. Skotak;G. Larsen
（CH 3CH 2CH 2 O）4 Ti/AcOH/聚（N-乙烯基吡咯烷酮）体系已显示出产生用于电流体动力学（EHD）加工成连续纤维和颗粒的合适制剂。该制剂和通常大多数基于溶胶-凝胶的制剂的EHD加工性成为具有窄亚微米范围直径分布的良好限定的纤维和颗粒不仅取决于EHD工艺变量（电场和流速），还取决于关键物理性质（例如，电导率、粘度、表面张力、密度和介电常数）。许多研究小组已经通过EHD处理几乎肯定仍在进行水解和缩合反应的溶胶，以制造具有亚微米特征的材料。因此，本文强调需要了解EHD处理的解决方案，以提供重现性和近单分散性的纤维直径的化学。随着时间的推移，监测反应的帮助下，通过红外细胞，并讨论了在溶液中的物种的结构。电导率和粘度随时间的变化的代表性配方进行了讨论，在典型的EHD处理时间尺度。通过EHD处理代表性溶胶，并通过扫描电子显微镜（SEM）表征织造和非织造纤维垫。
The (CH3CH2CH2O)4Ti/AcOH/poly(N-vinylpyrrolidone) system has been shown to yield suitable formulations for electrohydrodynamic (EHD) processing into continuous fibres and particles. The EHD processability of this, and generally most sol–gel-based formulations, into well defined fibres and particles with narrow submicron-range diameter distributions depends not only on the EHD process variables (electric field and flow rates), but also on the stability of key physical properties (e.g., conductivity, viscosity, surface tension, density and dielectric constant) of the sol over time. Sols that were almost certainly still undergoing hydrolysis and condensation reactions have been processed via EHD by many research groups to make materials with submicron features. This paper thus highlights the need for understanding the chemistry of EHD-processed solutions to afford reproducibility and near monodispersity in fibre diameter. Reactions were monitored over time with the aid of a flow-through infrared cell, and the structure of species in solution is discussed. Conductivity and viscosity changes with time of representative formulations are discussed in the light of typical EHD processing time scales. Representative sols were processed via EHD, and woven and non-woven fibrous mats were characterized by scanning electron microscopy (SEM).