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11. Enormous CO2Sorption Capacity of PDMS Rubbers near Condensation Pressure and at Low Temperatures

Author

Inoue, Mizuki, Ismail, Edhuan, Samitsu, Sadaki, Kanoh, Hirofumi, and Ichinose, Izumi

Abstract

We report for the first time that PDMS rubber sorbs an extremely large amount of CO2(792 mg g-1) at near the condensation pressure at a certain low temperature (-3 °C), giving the sorption enthalpy of 9.3–10.8 kJ mol-1. The sorption isotherms were evaluated by means of the Flory–Huggins equation, and the resultant ? parameters (1.3–0.2) were used to estimate the solubility parameter (SP). The CO2/CH4and CO2/N2selectivities were 9.6–44 at 100–3000 kPa and were far larger than those of activated carbon.Sorption isotherms for CO2in PDMS rubber were measured at -30 to 25 °C. The amount absorbed at -3 °C reached 792 mg g-1near the condensation pressure (3130 kPa). The sorption isotherms obeyed the Flory–Huggins equation, and CO2/N2selectivity exceeded 44, which is 23 times higher than that of conventional activated carbon.

Published
2022
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18. Review—Critical Considerations of High Quality Graphene Synthesized by Plasma-Enhanced Chemical Vapor Deposition for Electronic and Energy Storage Devices

Author

Azam, Mohd Asyadi, primary, Zulkapli, Nor Najihah, additional, Dorah, Norasimah, additional, Seman, Raja Noor Amalina Raja, additional, Ani, Mohd Hanafi, additional, Sirat, Mohd Shukri, additional, Ismail, Edhuan, additional, Fauzi, Fatin Bazilah, additional, Mohamed, Mohd Ambri, additional, and Majlis, Burhanuddin Yeop, additional

Published
2017
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19. Review-Critical Considerations of High Quality Graphene Synthesized by Plasma-Enhanced Chemical Vapor Deposition for Electronic and Energy Storage Devices

Author

Asyadi, Mohd, Najihah, Nor, Dorah, Norasimah, Noor, Raja, Raja, Amalina, Hanafi, Mohd, Shukri, Mohd, Ismail, Edhuan, Bazilah, Fatin, Ambri, Mohd, and, Mohamed, and Yeop, Burhanuddin

Abstract

Graphene is a promising electrode material not only due to its intrinsic properties like good electrical conductivity, high mechanical strength and high chemical stability, but also because of its high theoretical surface area of 2630 m2 g[?]1. In this report, the effect of CVD parameters to the growth of high quality graphene on metal substrates by using plasma enhanced chemical vapor deposition (PECVD) was extensively studied. Interestingly, synthesizing high quality graphene by PECVD technique is not only depending on the CVD parameters, but also depending on the catalysts and its plasma sources. It was found that Ni and Cu are the most favored metal catalysts for PECVD graphene growth. With high solubility of carbon (> 0.1 at. %), Ni effectively promote the growth of multilayer graphene by PECVD. However, large-area synthesis has made relatively inexpensive Cu as one of the most attractive substrates for monolayer graphene growth. Further details on the potential use of different transition metal catalysts in synthesizing graphene and consequently the specific usage of graphene based devices are discussed in this report.

Published
2017

20. Nanoconfinement-Driven Energy-Efficient CO2 Capture and Release at High Pressures on a Unique Large-Pore Mesoporous Carbon.

Author

Szabo L, Inoue M, Sekine Y, Motokawa R, Matsumoto Y, Nge TT, Ismail E, Ichinose I, and Yamada T

Abstract

Although microporous carbons can perform well for CO2 separations under high pressure conditions, their energy-demanding regeneration may render them a less attractive material option. Here, we developed a large-pore mesoporous carbon with pore sizes centered around 20-30 nm using a templated technical lignin. During the soft-templating process, unique cylindrical supramolecular assemblies form from the copolymer template. This peculiar nanostructuring takes place due to the presence of polyethylene glycol (PEG) segments on both the Pluronic® template and the PEG-grafted lignin derivative (glycol lignin). A large increase in CO2 uptake occurs on the resulting large-pore mesoporous carbon at 270 K close to the saturation pressure (3.2 MPa), owing to capillary condensation. This phenomenon enables a CO2/CH4 selectivity  (SCO2/CH4, mol/mol) of 3.7 at 270 K and 3.1 MPa absolute pressure, and a swift pressure swing regeneration process with desorbed CO2 per unit pressure far outperforming a benchmark activated carbon (i.e., notably rapid decrease in the amount of adsorbed CO2 with decreasing pressure). We propose large-pore mesoporous carbons as a novel family of CO2 capture adsorbents, based on the phase-transition behavior shift of CO2 in the nanoconfined environment. This novel material concept may open new horizons for physisorptive CO2 separations with energy-efficient regeneration options., (© 2025 Wiley‐VCH GmbH.)

Published
2025
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