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Sujin Lee,Hahkjoon Kim 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.1
The strong binding between streptavidin (SA) and biotin has been used as a useful tool in the study of biological system. When SA is mixed with biotinylated bovine serum albumin (bBSA), aggregates are formed by crosslinking. We employed fluorescence correlation spectroscopy to determine the hydrodynamic radius of SA-bBSA aggregates. We found that their hydrodynamic radius depends on the molar ratio of SA to bBSA, with the maximum radius being observed for 4:1 SA to bBSA. When the molar ratio of SA to bBSA was 6:1, the size of the aggregates decreased sharply because the SA molecules surround the bBSA and as a result, crosslinking is greatly reduced. Based on the hydration radius of the aggregates, we estimate that 7 to 8 SA molecules were bound to one bBSA.
Theoretical Study on the Reaction of p-Cymene with Ozone
Park Jiho,Kim Hahkjoon 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.6
Volatile organic compounds (VOCs) react with atmospheric OH, NO3, and O3 to form compounds having lower volatility, contributing to secondary organic aerosols (SOAs). Consequently, characterizing the reaction intermediate for this reaction is essential for modeling the formation of SOAs. Herein, we proposed a mechanism for the ozonolysis of p-cymene and calculated the energies of the intermediates generated during each step by density functional theory (DFT). According to our calculation, high-energy biradicals were produced in the ozonolysis of p-cymene, which plays an important role in the formation of SOAs, thereby affecting the climate and air quality.
Abbas, Muhammad A.,Yoon, Seog Joon,Kim, Hahkjoon,Lee, Junghyun,Kamat, Prashant V.,Bang, Jin Ho American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.13
<P>Intrinsic low stability and short excited lifetimes associated with Ag nanoclusters (NCs) are major hurdles that have prevented the full utilization of the many advantages of Ag NCs over their longtime contender, Au NCs, in light energy conversion systems. In this report, we diagnosed the problems of conventional thiolated Ag NCs used for solar cell applications and developed a new synthesis route to form aggregation-induced emission (AIE)-type Ag NCs that can significantly overcome these limitations. A series of Ag(0)/Ag(I)-thiolate core/shell-structured NCs with different core sizes were explored for photoelectrodes, and the nature of the two important interfacial events occurring in Ag NC-sensitized solar cells (photoinduced electron transfer and charge recombination) were unveiled by in-depth spectroscopic and electrochemical analyses. This work reveals that the subtle interplay between the light absorbing capability, charge separation dynamics, and charge recombination kinetics in the photoelectrode dictates the solar cell performance. In addition, we demonstrate significant improvement in the photocurrent stability and light conversion efficiency that have not been achieved previously. Our comprehensive understanding of the critical parameters that limit the light conversion efficiency lays a foundation on which new principles for designing Ag NCs for efficient light energy conversion can be built.</P> [FIG OMISSION]</BR>