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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.
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.
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.