Neoteric Conjugative Electrospinning towards Alloplastic Nanofiber Yarns Affording Enhanced Upconversion Luminescence and Tailored Magnetism

Abstract

Upconversion luminescent-magnetic [Y 2 O 3 :Yb 3 + , Er 3 + /polyacrylonitrile (PAN)]//[CoFe 2 O 4 /PAN] alloplastic nanofiber yarns (ANYs) are successfully prepared by a novel conjugative electrospinning. The ANYs consist of two different kinds of nanofibers, respectively called as [CoFe 2 O 4 /PAN] magnetic nanofibers and [Y 2 O 3 :Yb 3 + , Er 3 + /PAN] upconversion luminescent nanofibers, and the two kinds of nanofibers are combined together and twisted to form ANYs. Pumped by 980-nm laser, the ANYs exhibit excellent upconversion luminescence (UCL) and orange-red fluorescence. ANYs demonstrate tailored saturation magnetization by modulating CoFe 2 O 4 nanoparticles (NPs) content. The influence mechanism of magnetic CoFe 2 O 4 NPs on the UCL of ANYs is detailedly explored. The relationship between mechanicalproperties and twist for ANYs is explored through the tensile test. Compared with the counterpart coessential nanofiber yarns (CNYs), ANYs exhibit about 10 times stronger UCL intensity owing to the complete separation of the upconversion luminescent substance from the magnetic substance and thereby great reduction of impact of the magnetic substance on the upconversion luminescent substance. Thus, concurrent enhancive upconversion luminescence (UCL) and tunable magnetism of the ANYs are successfully achieved. The detailed formation mechanism of ANYs is advanced and a novel fabrication technique of yarns is established and can be popularized to prepare other bi-and multi-functional nanofibrous yarns.

2D Dual Anisotropic Conductive Janus Nanostrips Array Pellicle and Derivative 3D Janus‐structural Pipe Concurrently Endowed with Magnetism and Red‐green Two‐colored Fluorescence

“…Similarly, for R-SJAF in SJAP, the intensities of exciting light and emitting light also diminish slightly as the increase of CoFe 2 O 4 NPs content, as revealed in Figure 7c and Figure 7d. According to previous study, [41] CoFe 2 O 4 NPs also shows absorption to ultraviolet-visible light (300-800 nm). As a result, the luminescent intensities of L-SJAF and R-SJAF diminish when the contents of CoFe 2 O 4 NPs augment, mainly because more CoFe 2 O 4 NPs are introduced…”

Continuous Yarn Electrospinning

“…Work such as that from Dai et al [71] managed to overcome limitations of inherent material properties such as brittleness of ceramics by bringing the material into a form usually unattainable without the help of yarn electrospinning. Others such as Sheng et al [72] have recognized the potential of conjugate electrospinning combined with the funnel-based collection in creating multifunctional materials. These works, coming from just the past two years, are only beginning to scratch the surface of what may be possible with continuous yarn electrospinning.…”

The Significance of Electrical Polarity in Electrospinning: A Nanoscale Approach for the Enhancement of the Polymer Fibers' Properties

“…[101] This method is often used to produce electrospun yarns, [102,103] tissue scaffolds, [104] side-by-side or Janus structure fibers, [105][106][107] bipolar air filters, [108] and composites. [109,110]…”

“…As for the electric field, the nozzles are positioned apart so that their fields do not interact [101]. This method is often used to produce electrospun yarns,[102,103] tissue scaffolds,[104] side-by-side or Janus structure fibers,[105][106][107] bipolar air filters,[108] and composites [109,110].…”