Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 21, Issue 8, Pages 1398-1402Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201002061
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Funding
- State Basic Research Program of China [2010CB934700, 2007CB936403, 2009CB930400]
- National Natural Science Foundation of China [20974113, 20601005, 20973018]
- Fundamental Research Funds for the Central Universities [YWF-10-01-C10, YWF-10-01-B16]
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Inspired by the geometric structure of ecribellate spider capture silk and its spinning characteristics, we propose a one-step electrohydrodynamic method to fabricate bead-on-string heterostructured fibers (BSHFs). By combining electrospinning and electrospraying strategies using a sprayable outer fluid with low viscosity and a spinnable inner fluid with high viscosity in a coaxial jetting process, hydrophilic poly(ethylene glycol) beads are successfully imprinted on a hydrophobic polystyrene string. It is demonstrated that the BSHFs are capable of intelligently responding to environmental change. With a change in relative humidity, the fibers show a segmented swelling and shrinking behavior in the bead parts whereas the string parts remain the same. The elastic BSHFs with alternating hydrophilic and hydrophobic surface characteristics represent a type of mesoscale analogues that block copolymers and may bring about new properties and applications. Moreover, the combined electrohydrodynamic approach developed herein should open new routes to multifunctional one-dimensional heterostructured materials.
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