Effect of temperature and pressure on gas transport in ethyl cellulose membrane

Li, Xin‐Gui; Kresse, Ingo; Xu, Zhi‐Kang; Springer, Jürgen

doi:10.1016/s0032-3861(01)00121-5

Cited by 63 publications

(39 citation statements)

References 27 publications

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“…The former is lower and the latter is slightly higher than the literature data, 14 which are, respectively 29.9 and 31.2 kJ/mol, obtained from a thinner virgin EC membrane with a thickness of 18 m in the higher temperature range of 25-85°C.…”

Section: Effect Of Operating Parameters On Actual Oxygen Enrichment Fcontrasting

confidence: 65%

“…Like the virgin EC membrane, the 2BP/EC blend membranes with a 2BP content of no more than 10 wt % show a very low crystallinity. 14,27 It is this similar low crystallinity that offers the 2BP/EC membrane a constant permeability in comparison with the EC virgin membrane, as discussed below. However, a big change in the crystalline structure has taken place in the 4BP/EC (10/90) membrane, especially in the 4BP/EC (20/80) membrane, which exhibits more than two diffraction peaks (Fig.…”

Section: Characteristics Of Bp/ec Membranesmentioning

confidence: 95%

“…In the examined BP content range, the introduction of BP leads to a slight decrease in the tensile strength, a significant increase in the initial modulus, and an apparent decrease in the elongation at break in comparison with the pure EC membrane 14 (Tables I and II). For 2BP/EC membranes, the tensile strength decreases gradually as the 2BP content increases, except for 2BP/EC (25/75).…”

Section: Characteristics Of Bp/ec Membranesmentioning

confidence: 99%

“…14,27 An increase in the permeate pressure with time was recorded by two pressure sensors that were connected directly to a computer. The permeability coefficient P of the 4BP/EC membranes was calculated from the slope of the straight line in the steadystate region, and the ideal selectivity for a gaseous mixture of A and B was calculated from a ratio (P A / P B ) of two permeabilities of A and B.…”

Section: Gas-permeation Measurementsmentioning

confidence: 99%

“…One simple approach to minimize these problems is to employ additives. In recent years, the method of introducing some additives into traditional polymers possessing moderate O 2 /N 2 selectivity, such as ethyl cellulose (EC), 14 cellulose ester, 15 and polycarbonate, 16 to improve the permselectivity has attracted considerable attention due to its simplicity and convenience. The thermogravimetry and liquid crystallinity of typical polymers for gas separation including cellulose ester, 17 polyphenyleneoxide, 18 polymethylpentene, 19 polyvinylpyridine, 20 and polysiloxane 21 have been studied to elaborate their thermostability and structural order.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen enrichment across blend membranes of bipyridine and ethyl cellulose

Huang

et al. 2002

J of Applied Polymer Sci

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Blend membranes of 2,2Ј-bipyridine (2BP) or 4,4Ј-bipyridine (4BP) with ethyl cellulose (EC) containing no more than 25 wt % BP are prepared and evaluated for their oxygen enrichment by both the constant pressure-variable volume method and the constant volumevariable pressure method. The actual air-separation ability through the 2BP/EC blend membrane containing 1.5-7 wt % 2BP are enhanced while the permeated flux is slightly increased in comparison with the virgin EC membrane. Among the 2BP/EC blend membranes examined, the 2BP/EC blend membrane containing 3 wt % 2BP offers the best oxygen/nitrogen permselectivity and yields the highest oxygen concentration of 42.7% at the transmembrane pressure difference of 0.75 MPa and 25°C.Like other homogeneous dense membranes, the BP/EC blend membrane demonstrates strong dependencies on the transmembrane pressure difference, retentate/permeate flux ratio, and operating temperature. It possesses higher activation energy of oxygen and nitrogen permeation than those of the virgin EC membrane in the tested temperature range of 9.7-60°C. The CO 2 over CH 4 permselectivity through EC membranes can be improved by introducing 4BP, and the ideal oxygen over nitrogen separation factor through the 4BP/EC (10/90) membrane increases 16% at the upstream pressure of 10 bar compared with the virgin EC membrane.

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Section: Effect Of Operating Parameters On Actual Oxygen Enrichment Fcontrasting

confidence: 65%

Section: Characteristics Of Bp/ec Membranesmentioning

confidence: 95%

Section: Characteristics Of Bp/ec Membranesmentioning

confidence: 99%

Section: Gas-permeation Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxygen enrichment across blend membranes of bipyridine and ethyl cellulose

Huang

et al. 2002

J of Applied Polymer Sci

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Synthesis of Interfacially Active and Magnetically Responsive Nanoparticles for Multiphase Separation Applications

Peng

Liu

et al. 2012

Adv Funct Materials

143

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A novel interfacially active and magnetically responsive nanoparticle is designed and prepared by direct grafting of bromoesterified ethyl cellulose (EC‐Br) onto the surface of amino‐functionalized magnetite (Fe3O4) nanoparticles. Due to its strong interfacial activity, ethyl cellulose (EC) on the magnetic nanoparticles enables the EC‐grafted Fe3O4 (M‐EC) nanoparticles to be interfacially active. The grafting of interfacially active polymer EC on magnetic nanoparticles is confirmed by zeta‐potential measurements, diffuse reflectance infrared Fourier‐transform spectroscopic (DRIFTS) characterization, and thermogravimetric analysis (TGA). Scanning electron microscopy (SEM) images show a negligible increase in particle size, confirming the thin silica coating and grafted EC layer. The magnetization measurements show a marginal reduction in saturation magnetization by silica coating and EC grafting of original magnetic nanoparticles, confirming the presence of coatings. The M‐EC nanoparticles prepared in this study show excellent interfacial activity and highly ordered features at the oil/water interface, as confirmed using the Langmuir–Blodgett technique and atomic force microscopy (AFM). The magnetic properties of M‐EC nanoparticles at the oil/water interface make the interfacial properties tunable by or responsive to an external magnetic field. The occupancy of M‐EC at the oil/water interface allows rapid separation of the water droplets from emulsions by an external magnetic field, demonstrating enhanced coalescence of magnetically tagged stable water droplets and a reduced overall volume fraction of the sludge.

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A Deformable and Highly Robust Ethyl Cellulose Transparent Conductor with a Scalable Silver Nanowires Bundle Micromesh

et al. 2018

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Huge challenges remain regarding the facile fabrication of neat metallic nanowires mesh for high-quality transparent conductors (TCs). Here, a scalable metallic nanowires bundle micromesh is achieved readily by a spray-assisted self-assembly process, resulting in a conducting mesh with controllable ring size (4-45 µm) that can be easily realized on optional polymer substrates, rendering it transferable to various deformable and transparent substrates. The resultant conductors with the embedded nanowires bundle micromesh deliver superior and customizable optoelectronic performances, and can sustain various mechanical deformations, environmental exposure, and severe washing, exhibiting feasibility for large-scale manufacturing. The silver nanowires bundle micromesh with explicit conductive paths is embedded into an ethyl cellulose (EC) transparent substrate to achieve superior optoelectronic properties endowed by a low amount of incorporated nanowires, which leads to reduced extinction cross-section as verified by optical simulation. A representative EC conductor with a low sheet resistance of 25 Ω □ , ultrahigh transmittance of 97%, and low haze of 2.6% is attained, with extreme deformability (internal bending radius of 5 µm) and waterproofing properties, opening up new possibilities for low-cost and scalable TCs to replace indium-tin oxide (ITO) for future flexible electronics, as demonstrated in a capacitive touch panel in this work.

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Effect of temperature and pressure on gas transport in ethyl cellulose membrane

Cited by 63 publications

References 27 publications

Oxygen enrichment across blend membranes of bipyridine and ethyl cellulose

Oxygen enrichment across blend membranes of bipyridine and ethyl cellulose

Synthesis of Interfacially Active and Magnetically Responsive Nanoparticles for Multiphase Separation Applications

A Deformable and Highly Robust Ethyl Cellulose Transparent Conductor with a Scalable Silver Nanowires Bundle Micromesh

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