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RF 열플라즈마를 이용한 이차전지 음극재용 탄소나노실리콘복합소재 합성
이순직,김대신,연정미,박원규,신명선,최선용,주성후 한국재료학회 2023 한국재료학회지 Vol.33 No.6
To develop a high capacity lithium secondary battery, a new approach to anode material synthesis is required, capable of producing an anode that exceeds the energy density limit of a carbon-based anode. This research synthesized carbon nano silicon composites as an anode material for a secondary battery using the RF thermal plasma method, which is an ecofriendly dry synthesis method. Prior to material synthesis, a silicon raw material was mixed at 10, 20, 30, 40, and 50 wt% based on the carbon raw material in a powder form, and the temperature change inside the reaction field depending on the applied plasma power was calculated. Information about the materials in the synthesized carbon nano silicon composites were confirmed through XRD analysis, showing carbon (86.7~52.6 %), silicon (7.2~36.2 %), and silicon carbide (6.1~11.2 %). Through FE-SEM analysis, it was confirmed that the silicon bonded to carbon was distributed at sizes of 100 nm or less. The bonding shape of the silicon nano particles bonded to carbon was observed through TEM analysis. The initial electrochemical charging/ discharging test for the 40 wt% silicon mixture showed excellent electrical characteristics of 1,517 mAh/g (91.9 %) and an irreversible capacity of 133 mAh/g (8.1 %).
Glutamate, GABA, 5-HT의 이온영동적 주입이 동통과 관련된 시상 뉴론의 단위 활동에 미치는 효과
이순직,이배환,홍승길 고려대학교 의과대학 1988 고려대 의대 잡지 Vol.25 No.3
This experiment was conducted to determine what neurotransmitters are involved in ascending pain modulation mechanism from periaqueductal gray (PAG) to parafascicular nucleus (PF) of the thalamus by observing the response patterns of PF neurons to iontophoretically released drugs. For this, after the spontaneous activity of PF neurons and the evoked potentials to the noxious stimulus were recorded, the responses of neurons were observed while ejecting glutamate, gamma-aminobutyric acid (GABA), and 5-hydroxytryptamine (5-HT) iontophoretically. And the responses of neurons to electrical stimulation of the PAG were recorded. Results are as follows: 1. PF neurons which showed responses to the noxious stimulus were identified. 2. The activity of PF neurons was increased by iontophoretic application of glutamate but decreased by GABA. 3. The ejection of 5-HT tended to decrease the activity of PF neurons. 4. PAG stimulation by and large inhibited the increase in firing rate caused by the noxious stimulus. 5. The effects of glutamate and GABA on PF units were independent of the effect of PAG stimulation. 6. The effect of 5-HT of PF units was related to the inhibitory effect of PAG stimulation. The results may be interpreted to indicate that neurons mediating 5-HT but not glutamate and GABA are related to ascending pain modulation system from PAG to PF.