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Jungryeong Chae(채중령),Taeuk Lim(임태욱),Hao Cheng(성호),HyunJoon Yoo(유현준),Wonsuk Jung(정원석) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.8
In this study, a GO/MWCNT/PVDF(GMP) membrane was produced by adding graphene oxide (GO) and Multi-Wall Carbon nanotube (MWCNT) to control the pore size of the polyvinylidene fluoride (PVDF) membrane. GMP membrane was produced through Non-solvent induced phase inversion (NIPS) and comparative analysis was conducted under a total of four conditions by adding the appropriate ratio GO and MWCNT. The Manufactured GMP membrane has identified the properties and pore sizes changes of the membrane through Contact Angle, SEM and Porosimeter. GO influenced the formation of pores with a rich Oxygen- functional groups and in the case of CNT, it was shown that the Pore sizes of larger than GO due to the bundle phenomenon. When GO and CNT were mixed, the number of pores increased by more than quintuple compared to the CNT 0.2wt% condition, but the pore sizes decreased. Therefore, it was confirmed that the properties and pore sizes of the PVDF membrane can be controlled by adding a small amount of GO and CNT.
Chan-Yong Shul(설찬용),Jungryeong Chae(채중령),Taeuk Lim(임태욱),Hao Cheng(성호),Wonsuk Jung(정원석) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.8
In this study, impedance by changing the frequency of the AC current and the strength of the magnetic field in the experimental model circuit. The impedance of magnetorheological gel was calculated using relationship between dummy resistor and the measured magnitude of AC Voltage data. The impedance change of four types of magnetorheological gel with differently applied AC voltage frequency was investigated. The applied AC frequency showed a sinusoidal signal with amplitude of 1V and supplied to the magnetorheological gel through designed circuit. The AC voltage was supplied at frequency of 1Hz at first. The experiment was done again and again by changing the frequency of AC voltage, 2Hz 5Hz and 10Hz. The range of magnetic field density was from 0 to 150mT at 50mT intervals and the changes of the phase and amplitude of magnetorheological gel impedance analyzed. The experiment was conducted with four types of magneto-rheological gel samples and each sample were investigated in same condition. The experiment results shows that the electrical impedance of MR Gel samples added with the carbon material fillers were reduced compared to Pure MR Gel as two carbon materials (MWCNT and GO) were added. It has been confirmed that MR effects are inhibited by decreasing the range of changes in the magnetic field.
Jungryeong Chae(채중령),Hao Cheng(성호),Taeuk Lim(임태욱),HyunJoon Yoo(유현준),Wonsuk Jung(정원석) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.8
In this study, flow-induced electrical voltage and current associated with changing numbers of graphene layers in graphene surfaces prepared on PTFE (polytetrafluoroethylene) substrates by moving an ionic droplet of NaCl to investigate the effects of pseudocapacitance phenomena between each graphene surface and the ionic solution. Each sample exhibited different surface energies and electrical ionic double layers on the graphene surface. For each sample, these properties were evaluated by water contact angle measurements and Raman spectra, respectively. Additionally, we demonstrated changes in flow-induced voltage and current generation using various ionic concentrations of NaCl (0.2, 0.4, and 0.6 M). Based on triboelectrification and pseudocapacitance phenomena, the generated voltage and power for monolayer graphene were 8.1 and 15.9 times larger, respectively, than the values obtained for 3 layers.
자기장 환경에서 카르보닐철입자(CIPs) 기반 자가치유 캡슐의 동적 성능 분석에 관한 연구
성호 ( Cheng Hao ),호걸 ( Hu Jie ),임태욱 ( Lim Taeuk ),이영준 ( Lee Yeong Jun ),김상유 ( Sangyou Kim ),정원석 ( Jung Wonsuk ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
Recently, related studies on the application of bacterial spores to self-healing concrete have been widely reported. Using the self-healing method of bacterial spores as a kind of pro-environment, the green method is very attractive, but because the living environment of bacterial spores is relatively harsh, it is necessary to have a way to separate the living environment of bacterial spores from the harsh external environment, And release bacterial spores when needed. Therefore, capsules are widely used in self-healing concrete. To enhance the self-healing effect, the capsules need to be evenly distributed in the concrete. Furthermore, we develop a CIP-based smart capsule with controllability. We determined the magnetic force of each capsule by mixing CIP in resin, then mass-fabricating the capsules for self-healing by a microfluidic method, and by measuring the kinetic distance of the capsules containing different amounts of cip under the action of a magnetic field strength. The results show that with the increase of the amount of cip, the active distance of the capsule also increases. When the cip is 8wt%, the active distance reaches 1.75cm. We believe this research can provide momentum for the development of self-healing capsule applications.