Nanoporous Polymeric Membranes for Hydrogen Separation

Kumar, Rajesh; Kamakshi,; Kumar, Manoj; Awasthi, Kamlendra

doi:10.1007/978-3-030-33774-2_15

Cited by 3 publications

(3 citation statements)

References 110 publications

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“…The absorption bands at 1402-1450 cm −1 , 2857-2925 cm −1 , 1240 cm −1 , 1530 cm −1 , and 1740 cm −1 were assigned to the C-H bending, C-H stretching, C-O stretching, N-H bending, and C=O stretching of polycarbonates, respectively. The peak attributed to the main chain cannot be observed before and after UV irradiation [36][37][38][39]. This phenomenon is attributed to the absorption of the partial oxygen deficiency state of titania and not the coloration due to the modification of the polycarbonate matrix.…”

Section: Characterization Of Titania Hybrid Filmsmentioning

confidence: 93%

Polycarbonate/Titania Hybrid Films with Localized Photo-Induced Magnetic-Phase Transition

et al. 2020

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Materials that exhibit the photo-induced magnetic-phase transition of titania are receiving significant attention because they can be easily switched between diamagnetism and paramagnetism by UV irradiation. However, it is difficult to store photo-induced titanium (Ti3+) in air because of its easy oxidation upon oxygen exposure. In this study, titania/polycarbonate hybrid films were prepared using linear 1,6-hexanediol (PHMCD), cyclic 1,4-cyclohexanedimethanol (PCHCD), or their copolymerized carbonate oligomers using the sol–gel method. The oxygen permeability of the hybrid film decreased as the ratio of the ring structure increased by a factor of approximately 32 from PHMCD with only the chain structure to PCHCD with only the ring structure. These hybrid films can generate Ti3+ under a UV irradiation of 250 W for 2 h, and the difference in oxygen permeability significantly affected the lifetime of the Ti3+ by a factor of up to 120. In addition, the tensile tests and IR measurements demonstrated that UV irradiation had little effect on the mechanical intensity and matrix chemical structure. Moreover, the magnetic susceptibility of Ti3+ present in PCHCD was confirmed to be 6.2 (10−3 emu/g(titania)) under an external magnetic field of 5 T induced using a superconducting quantum interference device.

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Section: Characterization Of Titania Hybrid Filmsmentioning

confidence: 93%

Polycarbonate/Titania Hybrid Films with Localized Photo-Induced Magnetic-Phase Transition

et al. 2020

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“…Hence, HF acid removed Si atoms from the surface of the Si wafer and allowed pores to develop faster [10,11]. The surface morphologies of n-type P-Si are shown in fig.…”

Section: Device Fabricationmentioning

confidence: 99%

Photoresponse of porous silicon for potential optical sensing

Ahmed

Khatun²,

Sallam³

et al. 2022

EPL

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In this work, porous silicon (P-Si) structures were fabricated by anodizing n-type monocrystalline Si into an ethanoic-HF solution. Anisotropic electrochemical etching with constant time and current density was carried out to fabricate pores and their average diameter was found to be ~700 nm. Raman spectra exhibited widened peaks for red, blue, and green wavelengths. The widened photoluminescence (PL) spectrum was blue-shifted owing to the quantum confinement effect. The P-Si exhibited an energy gap of 1.80 eV and manifested a direct bandgap. The photoresponse of the fabricated P-Si based device was studied at different laser irradiation wavelengths in the range of 400-1100 nm. The best photoresponse was observed for 785 nm wavelength and the corresponding sensitivity was determined to be 9.4%. Hence, the P-Si can potentially be used for visible range photodetectors.

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“…The well-defined pore sizes in conjunction with a high surface area make ZIFs prime candidates for molecular sieving . ZIFs can be either grown in dense layers to form pure inorganic membranes on porous supports or dispersed within a polymer phase to form mixed matrix membranes. − Among the many ZIFs synthesized, some of them have exceptional thermal and chemical stability and exhibit great promise for hydrogen separation and purification. , …”

Section: Introductionmentioning

confidence: 99%

Effect of Zeolitic Imidazolate Framework Topology on the Purification of Hydrogen from Coke Oven Gas

Huang

Verougstraete

Mulder³

et al. 2023

ACS Sustainable Chem. Eng.

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This work aims to shed light on the performance of zeolitic imidazolate frameworks for hydrogen purification from coke oven gases (COG). Using molecular simulation, we model COG as a mixture of six gases and study the effect of ZIF topology on the separation performance. To do this, we compare similar structures, e.g., ZIF-8 and ZIF-11, and focus on obtaining information that explains why they behave differently while being so similar. Simulation results show that the structure with the smallest pore size best separates hydrogen from carbon monoxide and nonpolar molecules. The adsorption of carbon dioxide is also strongly affected by the polarizability of the structure. However, the adsorption of the other components (methane, carbon monoxide, nitrogen, and oxygen) is strongly dependent on their pore size. We also provide molecular information on the effect of phase transition on hydrogen purification using ZIF-7 as an example, which drastically changes the pore volume of the structure when it changes phase. These findings will help to select high-performance ZIFs for adsorption- or screening-based hydrogen purification.

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Nanoporous Polymeric Membranes for Hydrogen Separation

Cited by 3 publications

References 110 publications

Polycarbonate/Titania Hybrid Films with Localized Photo-Induced Magnetic-Phase Transition

Polycarbonate/Titania Hybrid Films with Localized Photo-Induced Magnetic-Phase Transition

Photoresponse of porous silicon for potential optical sensing

Effect of Zeolitic Imidazolate Framework Topology on the Purification of Hydrogen from Coke Oven Gas

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