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111 results on '"Park, Cheol-Woong"'

16. Bubble and dew-point measurement of mixtures of 1H,1H,2H-perfluoro-1-octene and 1H,1H,2H,2H-perfluoro-1-octanol in supercritical CO2.

Author

Dhamodharan, Duraisami, Ghoderao, Pradnya NP, Park, Cheol-Woong, and Byun, Hun-Soo

Subjects
PHASE equilibrium, ORGANIC solvents, ROOT-mean-squares, MANUFACTURING processes, CRITICAL temperature
Abstract

In this article, solubility data are presented for the fluoro-monomer (meth)acrylate, which plays an important role as an organic solvent in several industrial processes. High-pressure phase equilibria for 1H,1H,2H-perfluoro-1-octene + supercritical CO2 (PFOe + Sc-CO2), and 1H,1H,2H,2H-perfluoro-1-octanol + Sc-CO2 (PFOl + Sc-CO2) models were assessed in a static device at different temperatures starting from 313.2 to 393.2 K and maximum pressure of about 17.22 MPa. Temperature–pressure (T–p) diagrams of the PFOe + Sc-CO2 and PFOl + Sc-CO2 systems show mixture-critical curves between the critical temperatures of CO2 and PFOe or CO2 and PFOl. The solubility of PFOe and PFOl in the two systems gradually increases with increasing temperature at constant pressure. The experimental curves for the PFOe + Sc-CO2 and PFOl + Sc-CO2 binary models show phase behavior of curve type-I. Correlations of experimental results for the PFOe + Sc-CO2 and PFOl + Sc-CO2 models are compared with the P–R EOS using mixing rules with two parameters (κij, ηij). The root mean squared deviation (RMSD) percentages (%) for the two systems using the optimum factors evaluated at 353.2 K were 2.19% for PFOl + Sc-CO2 and 5.30% for PFOe + Sc-CO2. The RMSD (%) for the PFOl + Sc-CO2 model evaluated by the alterable factor at each temperature was 2.78%. [ABSTRACT FROM AUTHOR]

Published
2022
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24. Morphological Control of Donor/Acceptor Interfaces in All-Polymer Solar Cells Using a Pentafluorobenzene-Based Additive

Author

Kim, Hong Il, Kim, Minjun, Park, Cheol Woong, Kim, Hae Un, Lee, Han-Koo, and Park, Taiho

Abstract

We report a pentafluorobenzene-based additive (FPE) to control the donor/acceptor (D/A) interfacial morphology via quadrupolar electrostatic interactions between donor and acceptor polymers in all-polymer solar cells (all-PSCs). The morphology changes are investigated using a combination of atomic force microscopy, grazing incidence wide-angle X-ray scattering, and near-edge X-ray absorption fine-structure spectroscopy. Unlike a conventional solvent additive, such as 1,8-diiodooctane, a bicontinuous interpenetrating morphology without large-scale phase separation and an enhanced π–π stacking with face-on orientation are found in the FPE processed blended films. These morphology changes improve the charge carrier extraction and charge transport between D/A interfaces to achieve an increase in the photovoltaic performance of all-PSCs.

Published
2024
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43. Bubble and dew-point measurement of mixtures of 1H,1H,2H-perfluoro-1-octene and 1H,1H,2H,2H-perfluoro-1-octanol in supercritical CO2.

Author

Dhamodharan, Duraisami, Ghoderao, Pradnya NP, Park, Cheol-Woong, and Byun, Hun-Soo

Subjects
*PHASE equilibrium, *ORGANIC solvents, *ROOT-mean-squares, *MANUFACTURING processes, *CRITICAL temperature
Abstract

In this article, solubility data are presented for the fluoro-monomer (meth)acrylate, which plays an important role as an organic solvent in several industrial processes. High-pressure phase equilibria for 1H,1H,2H-perfluoro-1-octene + supercritical CO2 (PFOe + Sc-CO2), and 1H,1H,2H,2H-perfluoro-1-octanol + Sc-CO2 (PFOl + Sc-CO2) models were assessed in a static device at different temperatures starting from 313.2 to 393.2 K and maximum pressure of about 17.22 MPa. Temperature–pressure (T–p) diagrams of the PFOe + Sc-CO2 and PFOl + Sc-CO2 systems show mixture-critical curves between the critical temperatures of CO2 and PFOe or CO2 and PFOl. The solubility of PFOe and PFOl in the two systems gradually increases with increasing temperature at constant pressure. The experimental curves for the PFOe + Sc-CO2 and PFOl + Sc-CO2 binary models show phase behavior of curve type-I. Correlations of experimental results for the PFOe + Sc-CO2 and PFOl + Sc-CO2 models are compared with the P–R EOS using mixing rules with two parameters (κij, ηij). The root mean squared deviation (RMSD) percentages (%) for the two systems using the optimum factors evaluated at 353.2 K were 2.19% for PFOl + Sc-CO2 and 5.30% for PFOe + Sc-CO2. The RMSD (%) for the PFOl + Sc-CO2 model evaluated by the alterable factor at each temperature was 2.78%. [ABSTRACT FROM AUTHOR]

Published
2022
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45. Prevention of Complications

Author

Yang, Hee Seok, Park, Jeong Yoon, Kim, Hyeun Sung, editor, Heo, Dong Hwa, editor, Lim, Kangtaek, editor, Park, Cheol Woong, editor, and Park, Chun-Kun, editor

Published
2023
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49. Transforaminal Thoracic Discectomy

Author

Bae, Junseok, Kim, Jin-Sung, Choi, Gun, Kim, Hyeun Sung, editor, Heo, Dong Hwa, editor, Lim, Kangtaek, editor, Park, Cheol Woong, editor, and Park, Chun-Kun, editor

Published
2023
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