10/7 Seminar Speech

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Category: Speeches

Created on Wednesday, 02 October 2019 10:04

Last Updated on Tuesday, 08 October 2019 08:53

Published on Wednesday, 02 October 2019 10:07

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Speaker: Professor Shigenori Fujikawa

Topic: Large and free-standing nanomembranes for CO₂ capture

Speaker：Professor Shigenori Fujikawa

Organization：International Institute for Carbon-Neutral Energy Research, Kyushu University, Japan

Topic：Large and free-standing nanomembranes for CO₂ capture

Date：10:20 , 2019.10.7

Location：Room 203, College of Engineering

Education：

Kyushu University / Graduate School of Engineering / Ph.D.

Kyushu University / Graduate School of Engineering / Master

Kyushu University / Faculty of Engineering / Bachelor

Work Experience：

Kyushu University / International Institute for Carbon-Neutral Energy Research / Associate Professor

NanoMembrane Technologies Inc (Japan) / Partner and Board Member

Tokyo Institute Technology (Japan) / Principle Investigator

Tokyo Institute Technology (Japan) / Adjunct Associate Professor

RIKEN (Japan) / Deputy of Laboratory Head

RIKEN (Japan) / Special Postdoctoral Researcher

Abstract：

Biological lipid bilayer membrane is an ideal example for precise and efficient molecular separation. One of its characteristics is free-standing property with molecular thickness, and molecular scale phenomena become dominant in the direction of the membrane thickness. Thus, artificial membrane with a free standing properties and nanometer thickness would be a unique property different from conventional membrane. Based on this idea, we have developed functional free-standing nanomembranes with a centimeter-scale of lateral size. These membranes are manipulable macroscopically, event its thickness is a few tens nanometers.

We have succeeded to prepare free-standing and ultrathin membranes with precise molecular filtration ability by designing nanochannels structures across a membrane. Our next target is to separate further small molecules, including CO2 and gaseous molecules, because membrane separation of CO2 is one of promising CO2 capture technologies. In this scope, we have developed membranes composed of polymer and inorganic materials.

In polymeric nanomembranes, we have investigated cross linkable materials, such as an epoxy resin, urea and melamine derivatives, for the preparation of nanomembrane. In all case, we have succeeded to prepare free-standing membrane with a few tens nanometer thick, and the gas permeance of each membrane was investigated.

In inorganic membrane, we employed the composite materials composed of titanium alkoxide carboxylic derivatives, such as phthalic acid, to control the gas selectivity of the membrane. Based on a spin-coating process, titania composite membrane with the thickness of 100 nm or less was prepared on a PDMS support. Some composite membrane, show preferential CO2 permeation over nitrogen.

In membrane separation, the thickness plays an important role for the efficient separation. Further thinning of membrane close to the thickness of a biological lipid membrane is our challenge to create ideal membrane separation.