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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Oriented Contraction: A Facile Nonequilibrium Heat-Treatment Approach for Fabrication of Maghemite Fiber-in-Tube and Tube-in-Tube Nanostructures
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Oriented Contraction: A Facile Nonequilibrium Heat-Treatment Approach for Fabrication of Maghemite Fiber-in-Tube and Tube-in-Tube Nanostructures

机译：定向收缩：磁赤铁矿纤维在管和管在管纳米结构制造的一种方便的非平衡热处理方法。

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摘要

We present a simple and effective nonequilibrium heat-treatment approach that allows for the facile fabrication of maghemite (γ-Fe_2O_3) fiber-in-tube and tube-in-tube nanostructures by heat-treating electrospun precursor fibers composed of polyvinylpyrrolidone (PVP) and iron citrate with a carefully devised heating rate (R). In this nonequilibrium heat-treatment procedure, R can be easily utilized to tune the temperature gradient established in the inner portion of the fibers and the difference between the cohesive force and the adhesive force at the interface layer between the inner gel and the dense rigid shell generated in situ by a high R. Therefore, the contraction direction of the precursor nanofibers and the final morphology of the resultant γ-Fe_2O_3 fibers ranging from a simple tube to a fiber in tube to a tube in tube are realized for control. The nonequilibrium heat-treatment approach reported here can be readily extended to the fabrication of other materials with controllable interior structures by fast heating their corresponding gel precursors, which may be fabricated on the basis of electrospinning techniques and others. The resultant γ-Fe_2O_3 fiber-in-tube and tube-in-tube nanostructures may have important applications in a number of areas, such as magnetic separable catalysts or catalyst supporting materials, sensors, absorbents, microreactors, and so forth, because of their structural characteristics and good magnetic properties.
机译：我们提出了一种简单有效的非平衡热处理方法，该方法可以通过对聚乙烯吡咯烷酮（PVP）和聚乙烯吡咯烷酮（PVP）组成的电纺前体纤维进行热处理来轻松制造磁赤铁矿（γ-Fe_2O_3）管内纤维和管内纳米结构。精心设计的加热速率（R）的柠檬酸铁。在这种非平衡热处理过程中，R可以很容易地用于调节在纤维内部建立的温度梯度以及在内凝胶和致密刚性壳之间的界面层处的内聚力和粘附力之差。因此，可以实现前体纳米纤维的收缩方向和所得的γ-Fe_2O_3纤维的最终形态，其范围从简单的管到管中的纤维再到管中的管。通过快速加热其相应的凝胶前体，可以很容易地将此​​处报道的非平衡热处理方法扩展到其他具有可控内部结构的材料的制造，这些材料可以在静电纺丝技术等基础上制造。所得的γ-Fe_2O_3管内纤维和管内纳米结构可能在许多领域具有重要应用，例如磁可分离催化剂或催化剂载体材料，传感器，吸收剂，微反应器等，因为它们具有结构特性和良好的磁性能。

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