Stretchable Polyurethane Sponge Scaffold Strengthened Shear Stiffening Polymer and Its Enhanced Safeguarding Performance

Wang, Sheng; Xuan, Shouhu; Wang, Yunpeng; Xu, Chenhui; Mao, Ya; Liu, Mei; Bai, Linfeng; Jiang, Wanquan; Gong, Xinglong

doi:10.1021/acsami.5b12083

Cited by 79 publications

(59 citation statements)

References 33 publications

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“…The dense packing of NFs limits interchain movement and restricts changes in the resistance of the nanofibrillar membrane 26 . Recently, novel hybrid systems have been prepared using fabrication methods for creating various 3D structures 31,32 , and the resulting systems boast a combination of high electronic conductivity 33,34 and mechanical flexibility 35,36 . Despite the development of these new systems, a large demand for highly effective functional nanomaterials for use in high-performance flexible pressure sensors remains unmet.…”

Section: Introductionmentioning

confidence: 99%

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

2018

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Polymer-based pressure sensors play a key role in realizing lightweight and inexpensive wearable devices for healthcare and environmental monitoring systems. Here, conductive core/shell polymer nanofibers composed of poly (vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP)/poly(3,4-ethylenedioxythiophene) (PEDOT) are fabricated using three-dimensional (3D) electrospinning and vapor deposition polymerization methods, and the resulting sponge-like 3D membranes are used to create piezoresistive-type pressure sensors. Interestingly, the PEDOT shell consists of well-dispersed spherical bumps, leading to the formation of a hierarchical conductive surface that enhances the sensitivity to external pressure. The sponge-like 3D mats exhibit a much higher pressure sensitivity than the conventional electrospun 2D mats due to their enhanced porosity and pressure-tunable contact area. Furthermore, large-area, wireless, 16 × 10 multiarray pressure sensors for the spatiotemporal mapping of multiple pressure points and wearable bands for monitoring blood pressure have been fabricated from these 3D mats. To the best of our knowledge, this is the first report of the fabrication of electrospun 3D membranes with nanoscopically engineered fibers that can detect changes in external pressure with high sensitivity. The developed method opens a new route to the mass production of polymer-based pressure sensors with high mechanical durability, which creates additional possibilities for the development of human-machine interfaces.

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Section: Introductionmentioning

confidence: 99%

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

2018

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“…Electrospinning essentially operates at high voltages, which allows the electric field to surpass the polymer solutions' surface tension, thus generating nanofibers. It can produce porous nanofibrous mats with large surface area that can withstand continuous shear and vascular wall stretches (resembling extracellular matrix of skin tissue) and promote cell adhesion and proliferation, which are essential requirements for a material to be used as scaffold . To improve the case for use of silk nanoparticles for drug delivery and cancer therapeutics, magnetic functionalization is desired.…”

Section: Introductionmentioning

confidence: 99%

Silk nano‐discs: A natural material for cancer therapy

et al. 2018

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The article demonstrates the crystalline silk nano‐discs (CSNs), with well‐controlled morphology, which upon magnetization, yields magnetic crystalline silk nano‐discs, making both prominent alternatives for replacing metal templates such as gold, silver, and so on in therapeutics and implants. The isolated β‐sheet‐rich discotic CSNs have ~50 nm diameter, high crystallinity (> 90%), and are insoluble but provide good dispersibility and stability in aqueous solutions. The melt blending‐cum‐electrospinning of functionalized CSN with poly(lactic acid) results in biocompatible nanofiber‐based scaffolds having in vitro cell cytocompatibility with improved cell adhesion and proliferation. The assessment of release behavior of curcumin, a naturally occurring anticancer drug, shows sustained release over 25 days exhibiting effective cytotoxicity against human cervical cancer cells. Further, combined effect of curcumin and hyperthermia reduced the cell growth by ~63%. Alignment of CSN‐derived magnetic nanoparticles due to effective fiber drawing process during electrospinning could improve cytocompatibility against BHK‐21 cells, and therefore efficacy for cancer therapy.

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“…Artificial sponges, which resemble the aforementioned porous and elastic animal sponges, have been utilized in various fields including clean‐up, packaging, thermal insulation, flame retardant, and soft electronics with materials, such as carbon, polyurethane, and polydimethylsiloxane (PDMS) . The intensive investigations on such mechano‐regulated strategies adopted by the living systems and tremendous efforts on the biomimetic ones have opened a new path to the development of high‐performance devices in many fields, including energy, electronics, healthcare, and environment …”

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confidence: 99%

Bioinspired, Mechano‐Regulated Interfaces for Rationally Designed, Dynamically Controlled Collection of Oil Spills from Water

Zhu

Handschuh‐Wang

et al. 2017

Global Challenges

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In order to survive in nature, living systems undergo highly defined morphological evolution to adapt to environmental changes. For example, sponges, [1] aquatic animals of the phylum Porifera, possess bodies full of pores, channels, and chambers, through which a water flow circulates, to bring food and oxygen, and to remove wastes. Therefore, sponges represent a biological paradigm for storage and release of water in a so-called porous system. Possessing similar unique characteristics of natural ones, biomimetic systems have become more and more appealing. [2][3][4][5][6][7] Artificial sponges, which resemble the aforementioned porous and elastic animal sponges, have been This study describes the fabrication of bioinspired mechano-regulated interfaces (MRI) for the separation and collection of oil spills from water. The MRI consists of 3D-interconnected, microporous structures of sponges made of ultrasoft elastomers (Ecoflex). To validate the MRI strategy, ecoflex sponges are first fabricated with a low-cost sugar-leaching method. This study then systematically investigates the absorption capacity (up to 1280% for chloroform) of the sponges to different oils and organic solvents. More importantly, the oil flux through the as-made sponges is controlled by mechanical deformation, which increases up to ≈33-fold by tensile strain applied to the sponge from 0 to 400%. On the basis of MRI, this study further demonstrates the application of ecoflex sponges in oil skimmers for selective collecting oil from water with high efficiency and durable recyclability. The as-developed MRI strategy has opened a new path to allow rational design and dynamical control toward developing high performance devices for oil permeation and selective collection of oil spills from water.

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Stretchable Polyurethane Sponge Scaffold Strengthened Shear Stiffening Polymer and Its Enhanced Safeguarding Performance

Cited by 79 publications

References 33 publications

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

Silk nano‐discs: A natural material for cancer therapy

Bioinspired, Mechano‐Regulated Interfaces for Rationally Designed, Dynamically Controlled Collection of Oil Spills from Water

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