Use of Inter‐Fibril Spaces Among Electrospun Fibrils as Ion‐Fixation and Nano‐Crystallization
Use of Inter‐Fibril Spaces Among Electrospun Fibrils as Ion‐Fixation and Nano‐Crystallization
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DOI：
10.1002/9781119040392.ch4
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发表时间：
2015-01
期刊：
影响因子：
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通讯作者：
Y. Shirosaki;S. Hayakawa;Y. Nakamura;Hiroki Yoshihara;A. Osaka;Artemis Stamboulis
中科院分区：
文献类型：
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作者：
Y. Shirosaki;S. Hayakawa;Y. Nakamura;Hiroki Yoshihara;A. Osaka;Artemis Stamboulis
在这项研究中，聚乙烯醇（PVA）与钙，正磷酸盐（HPO42−）或铁离子的稀溶液被电纺以提供e纺PVA毡。静电纺丝系统由注射泵、阴极（10平方厘米的铝箔覆盖钢板）和阳极（注射器）组成，注射泵带有直径为0.5 mm的22 G注射器，阳极位于阴极上方15 cm处，在这些电极之间加载22 kV电场。已经提出尝试将纤维间空间用作纳米或微米反应器空间。发现PVA原纤维与戊二醛的交联挤压钙和磷酸根离子以形成磷酸二钙二水合物，但允许蒸汽分子或容纳的离子在原纤维之间迁移。由于暴露于氨蒸气的基本条件对于控制金属离子的行为是必不可少的，如磷灰石的沉积。本结果可以扩展到其他前体系统，无论聚合物或溶剂，只要它们可以容纳无机离子，并可渗透蒸汽，以改变纺丝原纤维中的化学环境。
In this study, dilute solution of poly(vinyl alcohol) (PVA) with calcium, orthophosphate (HPO42−), or ferric ions was electrospun to provide e‐spun PVA mats. The E‐spinning system consisted of a syringe pump with a 22G syringe of 0.5 mm in diameter, cathode (Al foil covered steel plate of 10 cm‐square), and anode (the syringe), 15 cm above the cathode where an electric field 22 kV was loaded between those electrodes. An attempt has been proposed to employ the inter‐fibril spaces as nano‐ or micro‐reactor spaces. Cross‐linking of PVA fibrils with glutaraldehyde was found to squeeze the calcium and phosphate ions to form dicalcium phosphate dihydrate but to allow the vapor molecules or the accommodated ions to migrate among the fibrils. The basic conditions due to the exposure to ammonia vapor were essential to control the behavior of the metal ions, like the deposition of apatite. The present results can be extended to other precursor systems regardless of polymers or solvents, as far as they can accommodate inorganic ions and are permeable with vapors to modify chemical environment in the spun fibrils.