Kyushu University [Roman Selyancyn (Associate Professor) Kyushu University Platform of Inter/Transdisciplinary Energy Research, ]

Roman Selyancyn

Last modified date：2024.04.23

Associate Professor / Kyushu University Platform of Inter/Transdisciplinary Energy Research

Presentations

1.	, [URL].
2.	Roman Selyanchyn and Shigenori Fujikawa, Optimization of the gas separation nanomembrane device and separation process for the direct air capture of carbon dioxide, MRM2023/IUMRS-ICA2023, 2023.12, [URL].
3.	Roman Selyanchyn and Shigenori Fujikawa, Exploring the feasibility of membrane technology for direct air capture, 13th International Congress on Membranes and Membrane Processes, 2023.07, [URL].
4.	Roman Selyanchyn, CO₂ preconcentration from air with the aid of membranes and its potential for distributed CO₂ utilization systems, Mirai 2.0 Sweden-Japan joint workshop "Research and Innovation week", 2022.11.
5.	Roman Selyanchyn, Risa Okeda, Keisuke Kanakogi, Shigenori Fujikawa, Nobuo Kimizuka, Prussian blue nanomembranes on porous supports: growth mechanism and gas separation, 2019.03, [URL].
6.	Roman Selyanchyn, Shigenori Fujikawa, In-situ formation of molecularly dispersed ZrO2 in polydimethylsiloxane for highly gas permeable membranes, 2019.03, [URL].
7.	Roman Selyanchyn, Olena Selyanchyn and Shigenori Fujikawa, Interface-governed, highly efficient CO₂/N₂ gas separation in thin-film composite nanomembranes, 2020.12, Gas separation membranes suitable for economically feasible post-combustion CO₂ capture should combine the moderate CO₂/N₂ selectivity (20-60) with a substantial values of CO₂ permeances (>1000 GPU). Most the membranes tailored to have these properties are so-called thin-film composite membranes (TFCM) containing different layers it structure, each having a specific function (porous support, gutter, selective, protective layer). Due to the highest resistance towards gas transport, selective layers in TFCM are commonly fabricated with thicknesses below 100 nm. In this work, in order to achieve high CO₂ permeances in TFCM we have fabricated ultra-thin selective layers (2-20 nm) composed of well-known hydrophilic and CO₂-selective block-copolymer (Pebax MH-1657). It was deposited on the O₂-plasma-activated surface of a much thicker (~400 nm) gutter layer composed of polydimethylsiloxane (PDMS). The structure was subsequently transferred on the polyacrylonitrile (PAN) microporous support to complete the TFCM. We have found that contrary to the theoretical predictions (resistance in the series model) for the layered membrane, highly selective CO₂/N₂ separation membrane was achieved in the TFCM with ultra-thin selective layer. The critical role to achieve this selectivity was attributed to the specific interface formed between selective and gutter layers which were controlled by the duration of oxygen plasma treatment (PDMS activation). Permeances of CO₂ in the developed TFCM were between 1000-3000 GPU and CO₂/N₂ selectivities between 30-100, providing the gas separation parameters that are within the optimal range for cost-efficient CO₂ capture in post-combustion processes. Detailed characterization of the interface revealed the chemical structure of the outermost membrane surface suggesting the blending of the ultra-thin Pebax-1657 layer with the activated surface of PDMS. This nano-thick blend layer contributed to the overall selectivity of the membrane significantly exceeding the selectivity that can be achieved by Pebax-1657 alone. The formed interface demonstrates stable gas separation with a moderate change of performance over one year..
8.	Roman Selyanchyn, Mixed matrix membranes containing highly CO2 selective ultramicroporous NbOFFIVE-1-Ni fillers: influence of particle size and content on CO2/N2 separation, International Congress on Membranes and Membrane Processes (ICOM-2020), 2020.12.
9.	Roman Selyanchyn, Shigenori Fujikawa, Development of the membranes for the CO2 separation from air based on the CO2 selective NbOFFIVE-1-Ni metal-organic framework, Material Research Society Fall meeting, 2021.12.
10.	Shigenori Fujikawa, Roman Selyanchyn, Miho Ariyoshi, Toyoki Kunitake, A New Strategy of Negative Carbon Emissions by Nanomembranes for Ubiquitous CO2 Capture, Material Research Society Fall meeting, 2021.12.
11.	Shigenori Fujikawa, Roman Selyanchyn, Miho Ariyoshi, Toyoki Kunitake, Efficient CO2 capture by free-standing polysiloxane nanomembranes, Pacifichem 2021, 2021.12.
12.	Roman Selyanchyn, Olena Selyanchyn and Shigenori Fujikawa, Utilization of molecular interface between polymer layers for better CO2/N2 separation by thin-film composite membranes, Pacifichem 2021, 2021.12.

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