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MASUD,김환규 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
To get highly efficient quasi-solid-state dye-sensitized solar cells (QSS-DSSCs) using polymer gel electrolytes (PGEs), well-defined ABA triblock copolymers ([Poly(methyl methacrylate)]2-block-poly(ethylene glycol)) with different end functionality and components of I-/I3- liquid electrolytes (LEs) are studied and optimized for the fabrication of PGE-based QSS-DSSCs. Due to the high reactivity and toxicity of sulfur-containing trithiocarbonate end groups, ABA triblock copolymers prepared from RAFT polymerization are modified to sulfur-free various end functional triblock copolymers by radical-induced exchange reactions. After optimization, the highest power conversion efficiency (PCE) for QSS-DSSCs achieved under simulated 1-sun illumination is up to 10.34%, which is comparable with the highest PCE of 10.39% for LE-DSSCs. Carboxylic acid end functional triblock copolymer can be a promising candidate as a sulfur-free polymeric matrix for gel electrolytes of QSS-DSSCs.
The Effectiveness of PAN-based Polymers for Quasi-Solid-State Dye-Sensitized Solar Cells
MASUD,김환규 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Polyacrylonitrile (PAN)-based polymer is a promising material to convert liquid electrolyte to gel state because of its high cation solvating ability and excellent mechanical strength. However, the PAN-based polymers exhibit poor solubility in acetonitrile (ACN) based solvent due to the strong dipole-dipole interaction among polymer chains. Copolymerization with other suitable monomers can solve the solubility problem and improve solvent retention ability. The PAN-based block copolymers, which are soluble in ACN solvent, can be highly effective materials as polymer gel electrolytes (PGEs) in quasi solid-state dye-sensitized solar cells (QSS-DSSCs). PAN-based PGEs can compete with liquid electrolytes in terms of photovoltaic performance and stability. Our developed PAN-based PGEs can be potential candidates for QSS-indoor DSSCs to power low light electronics and autonomous IoT devices commercially. For outdoor application, further enhancement of the stability of the device is required.
Corporate Governance and Bank Performance during COVID-19: Evidence from Bangladesh
Md Masud CHOWDHURY(Md Masud CHOWDHURY ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.2
The radical Coronavirus (COVID-19) has swiftly unfolded everywhere globally; it continues to unfold uncontrollably and critically, affecting all economies. The pandemic is not only a health issue but also has distinct effects on the global economy and enterprises. The impact of this novel Coronavirus is also well-documented in the financial sector. This study aims to investigate the impact of COVID-19 on corporate governance and banks’ financial performance. Moreover, this study also examines the impact of corporate governance on banks’ performance in Bangladesh. The study uses return on equity, return on assets, non-performing loans, return on investment, and earnings per share to measure the performance of the banks. And characteristics of corporate governance are measured by board size, number of independent directors on the board, number of female directors on the board, number of board meetings, and number of members in the audit committee. The study uses descriptive statistics, correlation analysis, t-test, and panel regression analysis. The study finds that COVID-19 significantly impacts the banks’ performance and some corporate governance characteristics. The study also reveals that corporate governance significantly impacts the financial performance of commercial banks. The findings of this study suggest that banks should concentrate more on corporate governance.
Single and Binary Competitive Sorption of Phenanthrene and Pyrene in Natural and Synthetic Sorbents
Masud, Md Abdullah Al,Shin, Won Sik Korean Society of Soil and Groundwater Environment 2022 지하수토양환경 Vol.27 No.6
Sorption of phenanthrene (PHE) and pyrene (PYR) in several sorbents, i.e., natural soil, BionSoil<sup>®</sup>, Pahokee peat, vermicompost and Devonian Ohio Shale and a surfactant (hexadecyltrimethyl ammonium chloride)-modified montmorillonite (HDTMA-M) were investigated. Pyrene exhibited higher sorption tendency than phenanthrene, as predicted by its higher octanol to water partition coefficient (K<sub>ow</sub>). Several sorption models: linear, Freundlich, solubility-normalized Freundlich model, and Polanyi-Manes model (PMM) were used to analyze sorption isotherms. Linear isotherms were observed for natural soil, BionSoil<sup>®</sup>, Pahokee peat, vermicompost, while nonlinear Freundlich isotherms fitted for Ohio shale and HDTMA-M. The relationship between sorption model parameters, organic carbon content (f<sub>oc</sub>), and elemental C/N ratio was studied. In the binary competitive sorption of phenanthrene and pyrene in natural soil, competition between the solutes caused reduction in the sorption of each solute compared with that in the single-solute system. The ideal adsorbed solution theory (IAST) coupled with the single-solute Freundlich model was not successful in describing the binary competitive sorption equilibria. This was due to the inherent nature of linear sorption of phenanthrene and pyrene in natural soil. The result indicates that the applicability of IAST for the prediction of binary competitive sorption is limited when the sorption isotherms are inherently linear.