My life and Korean carbon society

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon Letters / 15권 / 2호
ㆍ저자명 : Seung Kon Ryu

한국어 초록

I became an instructor at Chungnam National University in 1976, and was at Cleveland State University as a visiting professor in 1980/1981. My major was Biochemical Engineering and I was studying the hydrolysis of biomass to obtain alternative energy sources (Gasohol). I presented my research results (Attrition Bioreactor) at an ACS meeting, and this work became one of the ‘applications and unit operations’ selected for presentation in “Biotechnology in Industry”, published by Ann Arbor Science. Later, I got a letter from Prof. Bosung Rhee, who got his Ph.D. at Karlsruhe University (under Prof. E. Fitzer) and who was a senior professor in my department, to survey the existing research on mesophase pitch. I found some papers and informed myself about mesophase pitch. After I returned to Korea, Prof. Rhee suggested that we work together in the field of carbon materials. I hesitated to give him a definite answer. At that time, Korea was an under-developed country and our department received grant-type aid from Germany. The German-side supervisor of the aid was Professor Onken (Dortmund University, later president of the European Chemical Engineering Society), who suggested to me an international co-work project on fermentation. At the same time, Prof. Fitzer came to Korea and asked me to help Prof. Rhee in the development of carbon fiber in Korea. To this end, I studied the preparation of mesophase pitch. It was very interesting for me to observe liquid crystals in mesophase pitch with hot-stage and monitor. I and Prof. Rhee participated in the World Congress in Chemical Engineering in Tokyo (1985) to present the results of the mesophase pitch work [Photo 1]. During that time, I also got interested in the development and characterization of ACF (activated carbon fibers). However, in the beginning, I passed too much steam through the furnace to the chopped-pitch carbon fibers. SEM photos showed that the graphenes were lifted off the carbon fibers like onion layers [Photo 2]. Twenty years later, I found this was a good method for the mass production of graphene; however, at that time, I thought it was a mistake. In time, I learned to pass steam mixed with nitrogen, and finally produced nice ACF [Photo 3]. During the characterization of the new ACF, I wondered why the carbon fiber (0% burn-off) adsorbed CO2, but did not adsorb N2. Around 1992, Prof. J. B. Donnet (France) and Prof. Fitzer (Germany) prepared an STM (Scanning Tunneling Microscope) in Karlsruhe, Germany. Prof. Donnet asked me for ACF samples to observe with the STM. The ACF surface morphology [Photo 4] imaged by STM was quite different from SEM observations [1].

영어 초록

I became an instructor at Chungnam National University in 1976, and was at Cleveland State University as a visiting professor in 1980/1981. My major was Biochemical Engineering and I was studying the hydrolysis of biomass to obtain alternative energy sources (Gasohol). I presented my research results (Attrition Bioreactor) at an ACS meeting, and this work became one of the ‘applications and unit operations’ selected for presentation in “Biotechnology in Industry”, published by Ann Arbor Science. Later, I got a letter from Prof. Bosung Rhee, who got his Ph.D. at Karlsruhe University (under Prof. E. Fitzer) and who was a senior professor in my department, to survey the existing research on mesophase pitch. I found some papers and informed myself about mesophase pitch. After I returned to Korea, Prof. Rhee suggested that we work together in the field of carbon materials. I hesitated to give him a definite answer. At that time, Korea was an under-developed country and our department received grant-type aid from Germany. The German-side supervisor of the aid was Professor Onken (Dortmund University, later president of the European Chemical Engineering Society), who suggested to me an international co-work project on fermentation. At the same time, Prof. Fitzer came to Korea and asked me to help Prof. Rhee in the development of carbon fiber in Korea. To this end, I studied the preparation of mesophase pitch. It was very interesting for me to observe liquid crystals in mesophase pitch with hot-stage and monitor. I and Prof. Rhee participated in the World Congress in Chemical Engineering in Tokyo (1985) to present the results of the mesophase pitch work [Photo 1]. During that time, I also got interested in the development and characterization of ACF (activated carbon fibers). However, in the beginning, I passed too much steam through the furnace to the chopped-pitch carbon fibers. SEM photos showed that the graphenes were lifted off the carbon fibers like onion layers [Photo 2]. Twenty years later, I found this was a good method for the mass production of graphene; however, at that time, I thought it was a mistake. In time, I learned to pass steam mixed with nitrogen, and finally produced nice ACF [Photo 3]. During the characterization of the new ACF, I wondered why the carbon fiber (0% burn-off) adsorbed CO2, but did not adsorb N2. Around 1992, Prof. J. B. Donnet (France) and Prof. Fitzer (Germany) prepared an STM (Scanning Tunneling Microscope) in Karlsruhe, Germany. Prof. Donnet asked me for ACF samples to observe with the STM. The ACF surface morphology [Photo 4] imaged by STM was quite different from SEM observations [1].

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