Kyushu University Academic Staff Educational and Research Activities Database
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Roman Selyancyn Last modified date:2021.10.28

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Research Center for Negative Emissions Technologies (CO₂ Capture Research Division) .
Chemistry and Biochemistry Course, Department of Applied Chemistry, Graduate School of Engineering, Faculty of Engineering
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Academic Degree
Doctor of Engineering
Field of Specialization
Engineering, nanotechnology, carbon dioxide, membrane based gas separation, analytical chemistry, sensors
ORCID(Open Researcher and Contributor ID)
Research Interests
  • Advanced gas separation membranes for sustainable energy and a clean environment.
    keyword : carbon dioxide, gas separation membrane, CO2-affinity, CO2-philicity, active interfaces, MOFs for gas separation
Academic Activities
1. Shigenori Fujikawa, Roman Selyanchyn, Toyoki Kunitake, A new strategy for membrane-based direct air capture., Polym. J. (Tokyo, Jpn.), 10.1038/s41428-020-00440-4, 53, 1, 219, 2021.01, [URL],
ABSTRACT: Direct CO2 capture from the air, so-called direct air capture (DAC), has become inevitable to reduce the concentration of CO2 in the atmosphere. Current DAC technologies consider only sorbent-based systems. Recently, there have been reports that show ultrahigh CO2 permeances in gas separation membranes and thus membrane separation could be a potential new technology for DAC in addition to sorbent-based CO2 capture. The simulation of chemical processes has been well established and is commonly used for the development and performance assessment of industrial chemical processes. These simulations offer a credible assessment of the feasibility of membrane-based DAC (m-DAC). In this paper, we discuss the potential of m-DAC considering the state-of-the-art performance of organic polymer membranes. The multistage membrane separation process was employed in process simulation to estimate the energy requirements for m-DAC. Based on the analysis, we propose the target membrane separation performance required for m-DAC with competitive energy expenses. Finally, we discuss the direction of future membrane development for DAC..
2. Olena Selyanchyn, Roman Selyanchyn, Shigenori Fujikawa, Critical role of the molecular interface in double-layered Pebax-1657/PDMS nanomembranes on highly efficient CO2/N2 gas separation, ACS Applied Materials and Interfaces, 10.1021/acsami.0c07344, 2020.07, [URL],
ABSTRACT: In this work, we deposited a CO2-selective block copolymer, Pebax-1657, as a selective layer with a thickness of 2–20 nm on the oxygen plasma-activated surface of poly(dimethylsiloxane) (PDMS) used as a gutter layer (thickness ∼400 nm). This double-layered structure was subsequently transferred onto the polyacrylonitrile (PAN) microporous support and studied for CO2/N2 separation. The effect of interfacial molecular arrangements between the selective and gutter layers on CO2 permeance and selectivity has been investigated. We have revealed that the gas permeance and selectivity do not follow the conventional theoretical predictions for the multilayer membrane (resistance in series transport model); specifically, more selective CO2/N2 separation membranes were achieved with ultrathin selective layers. Detailed characterization of the chemical structure of the outermost membrane surface suggests that nanoscale blending of the ultrathin Pebax-1657 layer with O2 plasma-activated PDMS chains on the surface takes place. This nanoblending at the interface between the selective and gutter layers played a critical role in enhancing the CO2/N2 selectivity. CO2 permeances in the developed thin-film composite membranes (TFCM) were between 1200 and 3500 gas permeance units (GPU) and the respective CO2/N2 selectivities were between 72 and 23, providing the gas separation performance suitable for CO2 capture in postcombustion processes. This interpenetrating polymer interface enhanced the overall selectivity of the membrane significantly, exceeding the separation ability of the pristine Pebax-1657 polymer..
Educational Activities
Co-instructor in the Automotive Advanced Science class (Spring Semester) from 2019 ~ ongoing
Co-instructor in the AMS International Communication seminar (Spring/Autumn Semesters) from 2019 ~ ongoing
Co-instructor in the KIKAN Class - Introduction to Carbon Dioxide: Emissions, Capture, Storage and Utilization (Autumn Semester) 2020, course code 20892233