PDF Publication Title:
Text from PDF Page: 010
258 X. Wang and B. Li Fig. 10.4 SEM images of the (a) surface and (b) cross-section of an electrospun Nafion/PEO composite membrane. (c) Cross-sectional image of an electrospun Nafion/PEO composite mem- brane containing [hmim][PF6]. (d) Ideal selectivity and (e) CO2 permeance of the membrane prepared with IL, electrospun Nafion-IL, and Nafion-IL membranes (Reprinted from Yoo et al. [41]. Copyright 2010, with permission from Elsevier) membranes via electrospinning. Figure 10.4 shows the representative scanning electron microscopy (SEM) images of the Nafion/PEO electrospun structures. It can be seen that dry membranes are composed of numerous randomly oriented fibers with diameters of about 300 nm (Fig. 10.4a). The SEM image of IL-swollen Nafion membranes showed that almost all the voids among fibers were filled (Fig. 10.4c). Figure 10.4d and e presents the CO2 separation parameters of IL, Nafion-IL dense membranes, and electrospun Nafion/PEO supported IL membranes. The gas permeance and selectivity of electrospun Nafion/PEO/[hmim][BF4] maintained the characteristics of supported IL membranes containing [hmim][BF4], while the CO2 permeance through the electrospun Nafion/PEO/[hmim][PF6] increased from 20 to 28 GPU. The selectivity of CO2/CH4 slightly increased from 17.1 to 22.4, implying that the high adsorption of [hmim][PF6] into Nafion made a definite contribution in CO2 separation. Recently, Tang et al. [21] reported that poly(ionic liquid)s showed significantly enhanced and fast CO2 absorption compared to ILs. Especially, the polymers of tetraalkylammonium-based ILs have CO2 sorption capacities 6.0–7.6 times of those of room temperature ILs. Electrospinning of the poly(ionic liquid) solution was first demonstrated by Chen and co-workers [42]. Figure 10.5 shows the electrospun fibers from various concentrations of poly(1-[(2-methacryloyloxy)ethyl]-3- butylimidazolium tetrafluoroborate or MEBIm-BF4) in cosolvent 3/1 acetoni- trile/DMF. At 2.5 wt%, a concentration below the entanglement concentration, only droplets were obtained (Fig. 10.5a). Beaded fibers were observed at 5 andPDF Image | Electrospun Nanofibrous Sorbents
PDF Search Title:
Electrospun Nanofibrous SorbentsOriginal File Name Searched:
wang_chapter_2014.pdfDIY PDF Search: Google It | Yahoo | Bing
Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |