The Microstructure Characterization and the Mechanical Properties of Electrospun Polyacrylonitrile-Based Nanofibers

Zhang, Chen; Ding, Xuejia; Wu, Sizhu

doi:10.5772/23950

Cited by 2 publications

(4 citation statements)

References 40 publications

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Section: Morphological Characterization Of Hybrid Microfiber Coatingssupporting

confidence: 92%

“…By increasing the weight ratio of SAPO-34 in the precursor, an equivalent increase of the solution electrospinnability was observed. This correlation between precursor electrospinnability and microfiber diameter is in good agreement with literature data [35,45,46]. The effect on the microfiber structure of increasing the zeolite concentration is more evident at higher magnifications, as shown in Figure 4, where samples PAN-M45, PAN-M75 and PAN-M85 are compared.…”

Section: Morphological Characterization Of Hybrid Microfiber Coatingssupporting

confidence: 91%

“…The gravimetric curve of the zeolite (Figure 6a) shows a maximum weight loss of 20%, which was reached at a temperature of 220 • C and a peak of endothermic heat in the DSC curve at T = 127 • C. In an adsorption heat pump driven by low temperature sources, the thermodynamic cycle varies within a pressure range of 10-40 mbar and a temperature range of 25-100 • C. The TGA curve of pure PAN microfibers (Figure 6b) shows that they are thermally stable up to 250 • C; above that temperature, an exothermic peak appears, which is associated with the greatest mass loss. The observed heat flow at~300 • C was an indication that cyclization and dehydrogenation reactions had occurred in the PAN microfibers [46]. Dehydrogenation and cyclization of the polyacrylonitrile structure gives rise to the formation of double bonds and rings along the carbon chain that "stabilize" the PAN microfibers [36,37,47].…”

Section: Thermal and Adsorption Properties Of The Microfibersmentioning

confidence: 95%

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Advanced Adsorbent Materials for Waste Energy Recovery

et al. 2020

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Nowadays, waste thermal energy represents a huge quantity of energy that, in most cases, is unfortunately dispersed rather than recovered. Although it is well known that its recovery could result in a considerable impact reduction of human activities on the environment, it is still a challenging issue. In view of this, absorption chillers and heat pumps, based on the use of porous materials capable of reversibly adsorbing and desorbing water vapor, can be considered among the preferred systems to recover waste thermal energy, especially at medium–low temperatures. This study deals with the preparation and performance of a new generation of advanced adsorbent materials specifically produced as coatings for water adsorption systems driven by low temperature heat sources (around 150 °C). The proposed coating consists of hybrid SAPO-34/polyacrilonitrile microfibers directly deposited on the surface to be coated by means of the electrospinning technique. Their zeolite morphology and concentrations, as well as their distribution over the polymeric microfibers, were key variables in achieving the best combination of adsorption properties and hydrothermal stability of the coating.

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Section: Morphological Characterization Of Hybrid Microfiber Coatingssupporting

confidence: 92%

Section: Morphological Characterization Of Hybrid Microfiber Coatingssupporting

confidence: 91%

Section: Thermal and Adsorption Properties Of The Microfibersmentioning

confidence: 95%

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Advanced Adsorbent Materials for Waste Energy Recovery

et al. 2020

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“…Fig. 2 shows that the fibers began to break due to the increase in the distance between the rods at 12 cm, the fibers expand for a big distance between the rods causing them to break because of the failure of cohesion among fibers [18]. So, what has been observed by controlling the distance between the rods to reduce the beads, while being careful to increase the distance must be limited to avoid breaking the nanofibers [19].…”

Section: Resultsmentioning

confidence: 99%

Using the Rods as Collector and Study of its Effect on Morphology and Uniformity of Nanofibers via Electrospinning

Al-Hazeem

Mohammad

Hassan

et al. 2023

KEM

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Nanotechnology research has lacked to provide new studies on nanofibers using the electrospinning method, the reasons are attributed that all parameters have been covered by previous studies. Believing that science is in a state of constant renewal leads to the possibility to study a parameter that has not been studied before, which affects the morphology of nanofibers. One of the disadvantages of nanofibers manufacturing is the formation of beads, and controlling the parameter helps reduce these beads. Field emission scanning electron microscope (FESEM) images reveal the formation of nanofibers and surface topography observations by atom force microscopy (AFM) indicates that the roughness is improved by changing the distance between rods of the collector. The rods function as a collector for nanofibers, changing this parameter improves the morphology and diameter of the nanofibers.

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The Microstructure Characterization and the Mechanical Properties of Electrospun Polyacrylonitrile-Based Nanofibers

Cited by 2 publications

References 40 publications

Advanced Adsorbent Materials for Waste Energy Recovery

Advanced Adsorbent Materials for Waste Energy Recovery

Using the Rods as Collector and Study of its Effect on Morphology and Uniformity of Nanofibers via Electrospinning

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