Abstract:ABSTRACT:We demonstrated the fabrication of freestanding zeolitic imidazolate framework 7 (ZIF-7) nanofiber (NF) mats by means of one-step, scalable electrospinning. The formation of ZIF-7 nanoparticles embedded in polymer fibers was unambiguously pinpointed via X-ray diffraction, transmission electron microscopy, and adsorption studies. The NF mats exhibited excellent characteristics, with an average diameter of 245 nm, in the adsorption and desorption of carbon dioxide (CO 2 ); this makes them attractive can… Show more
“…To fabricate a large-area electrospun PAN nanofiber (NF) mat, 26,27,29,30 an 8 wt% PAN solution in DMF was electrospun onto a rotating drum with a fixed flow rate of 0.3 mL/h and a fixed high DC voltage of 7.5 kV, where an 18-gauge needle (Sigma-Aldrich, USA), a syringe pump (New Era Pump System, USA), and a DC voltage supply (Glassman High Voltage, USA) were used for electrospinning. The distance between the needle and the drum-type collector was 10 cm.…”
Here, model blister-like soft thermo-pneumatic artificial muscles with the embedded nanofibers impregnated with ethanol are developed. The muscles are essentially blister-like thermo-pneumatic soft actuators (BTSAs), which deflect in response to heat supplied to their bottom. The resulting deflections are on the scale of 1 cm, and the BTSAs are operational for several cycles. They are able to raise the artificial rigid scales, spines or fur/thin fibers attached to them emulating animals such as pangolin, hedgehog and porcupine. They are also capable of removing the stickiest adhesive tapes attached to them, and thus hold great promise for biomedical applications where artificially grown skin patches should be removed from an underlying substrate without being damaged. The theory of the BTSA proposed in this work is in reasonable agreement with the acquired experimental data.
“…To fabricate a large-area electrospun PAN nanofiber (NF) mat, 26,27,29,30 an 8 wt% PAN solution in DMF was electrospun onto a rotating drum with a fixed flow rate of 0.3 mL/h and a fixed high DC voltage of 7.5 kV, where an 18-gauge needle (Sigma-Aldrich, USA), a syringe pump (New Era Pump System, USA), and a DC voltage supply (Glassman High Voltage, USA) were used for electrospinning. The distance between the needle and the drum-type collector was 10 cm.…”
Here, model blister-like soft thermo-pneumatic artificial muscles with the embedded nanofibers impregnated with ethanol are developed. The muscles are essentially blister-like thermo-pneumatic soft actuators (BTSAs), which deflect in response to heat supplied to their bottom. The resulting deflections are on the scale of 1 cm, and the BTSAs are operational for several cycles. They are able to raise the artificial rigid scales, spines or fur/thin fibers attached to them emulating animals such as pangolin, hedgehog and porcupine. They are also capable of removing the stickiest adhesive tapes attached to them, and thus hold great promise for biomedical applications where artificially grown skin patches should be removed from an underlying substrate without being damaged. The theory of the BTSA proposed in this work is in reasonable agreement with the acquired experimental data.
“…An et al applied several slurries for fabricating freestanding ZIF-7/PAN nanofibers. Instead of starting from crystalline ZIF-7 powder dispersion, ZIF-7 nanoparticles were crystallized in the PAN polymer solution from the metal precursor and the ligand before electrospinning . Li et al developed ZIF67/PAN porous conductive nanofiber by electrospinning and carbonization for Li–S batteries.…”
Section: Introductionmentioning
confidence: 99%
“…Instead of starting from crystalline ZIF-7 powder dispersion, ZIF-7 nanoparticles were crystallized in the PAN polymer solution from the metal precursor and the ligand before electrospinning. 39 Li et al developed ZIF67/PAN porous conductive nanofiber by electrospinning and carbonization for Li−S batteries. The ZIF67 nanoparticles are dispersed in the PAN polymer solution and electrospun into composite nanofibers.…”
Zeolitic
imidazolate framework-67 (ZIF67) has been regarded as
an effective energy storage material due to its high surface area
and electroactive cobalt center. Carbonizing ZIF67 can enhance electrical
conductivity by converting 2-methylimidazole (2-melm) to carbon with
cobalt doping. In this work, a novel in situ electrospinning
is proposed to fabricate carbonized ZIF67 on carbon fiber (C67@PAN-OC)
as a freestanding supercapacitor electrode. Polyacrylonitrile solution
containing a cobalt precursor is used for electrospinning, and produced
fibers are immersed in 2-melm to form ZIF67. Individually grown carbonized
ZIF67 on carbon fiber is obtained using the in situ electrospinning method, while the one-body mixed carbon electrode
is formed using the ex situ electrospinning method.
A highest specific capacitance (C
F) of
386.3 F/g at 20 mV/s is obtained for the in situ synthesized
C67@PAN-OC electrode due to the largest electrochemical surface area
and the smallest resistance, while the ex situ synthesized
electrode only shows a C
F value of 27.7
F/g. A symmetric supercapacitor (SSC) assembled using the optimized
C67@PAN-OC electrodes and gel electrolytes shows a maximum energy
density of 9.64 kWh/kg at 0.55 kW/kg and a C
F retention of 59.5% after 1000 times charge/discharge process.
A C
F retention of 75.6% after bending
100 times is also obtained for SSC.
“…The adsorption of carbon dioxide is a potential technique for removing CO 2 from a gas mixture in commercial and industrial applications 4 . For anthropogenic CO 2 collection, several methods have been developed, including amine–solvent scrubbing, cryogenic distillation, solid sorbents, membrane separation, and adsorption processes 5 , 6 . Because of its high overall efficiency, low power consumption, and low operating cost, as well as its ability to work across a wide range of temperatures and pressures, adsorption onto porous solid materials is a promising CO 2 separation method 7 .…”
In this study, a new adsorbent was investigated for CO2 adsorption in the fixed-bed column. Poly (acrylonitrile) nanofibers were prepared by electrospinning, then grafting under gamma irradiation with glycidyl methacrylate (GMA). Then, the nanofibers were modified with ethanolamine (EA), diethylamine (DEA) and triethylamine (TEA) to adsorb carbon dioxide molecules. Dynamic adsorption experiments were performed with a mixture of CH4, CO2 in a constant bed column at ambient pressure and temperature and CO2 feed concentration (5%). The maximum adsorption capacity is 2.84 mmol/g for samples with 172.26% degree of grafting (DG) in 10 kGy. Also, the degree of amination with ethanolamine was achieved equal to 170.83%. In addition, the reduction of the regeneration temperature and the stability of this adsorbent after four cycles indicated the high performance of this adsorbent for CO2 adsorption.
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